diff --git a/sysmoOCTSIM/AtmelStart.gpdsc b/sysmoOCTSIM/AtmelStart.gpdsc
index 4784595..44b5c62 100644
--- a/sysmoOCTSIM/AtmelStart.gpdsc
+++ b/sysmoOCTSIM/AtmelStart.gpdsc
@@ -42,6 +42,7 @@
       <description>Atmel Start Framework</description>
       <RTE_Components_h>#define ATMEL_START</RTE_Components_h>
       <files>
+        <file category="doc" condition="ARMCC, GCC, IAR" name="hal/documentation/usart_sync.rst"/>
         <file category="doc" condition="ARMCC, GCC, IAR" name="hal/documentation/usb_device_async.rst"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hal_atomic.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hal_cache.h"/>
@@ -56,10 +57,23 @@
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_delay.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_dma.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_gpio.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_i2c_m_async.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_i2c_m_sync.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_i2c_s_async.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_i2c_s_sync.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_init.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_irq.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_ramecc.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_sleep.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_spi.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_spi_async.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_spi_m_async.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_spi_m_dma.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_spi_m_sync.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_spi_s_async.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_spi_s_sync.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_spi_sync.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_usart.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_usb.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_usb_device.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_usb_host.h"/>
@@ -151,8 +165,12 @@
         <file category="header" condition="ARMCC, GCC, IAR" name="atmel_start_pins.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="examples/driver_examples.h"/>
         <file category="source" condition="ARMCC, GCC, IAR" name="examples/driver_examples.c"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hal_usart_sync.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_missing_features.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_reset.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_usart_async.h"/>
+        <file category="header" condition="ARMCC, GCC, IAR" name="hal/include/hpl_usart_sync.h"/>
+        <file category="source" condition="ARMCC, GCC, IAR" name="hal/src/hal_usart_sync.c"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hal/utils/include/parts.h"/>
         <file category="source" condition="ARMCC, GCC, IAR" name="hpl/cmcc/hpl_cmcc.c"/>
         <file category="source" condition="ARMCC, GCC, IAR" name="hpl/core/hpl_core_m4.c"/>
@@ -168,6 +186,7 @@
         <file category="header" condition="ARMCC, GCC, IAR" name="hpl/pm/hpl_pm_base.h"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="hpl/port/hpl_gpio_base.h"/>
         <file category="source" condition="ARMCC, GCC, IAR" name="hpl/ramecc/hpl_ramecc.c"/>
+        <file category="source" condition="ARMCC, GCC, IAR" name="hpl/sercom/hpl_sercom.c"/>
         <file category="source" condition="ARMCC, GCC, IAR" name="hpl/usb/hpl_usb.c"/>
         <file category="source" condition="ARMCC, GCC, IAR" name="usb_start.c"/>
         <file category="header" condition="ARMCC, GCC, IAR" name="usb_start.h"/>
@@ -180,6 +199,7 @@
         <file attr="config" category="header" condition="ARMCC, GCC, IAR" name="config/hpl_osc32kctrl_config.h"/>
         <file attr="config" category="header" condition="ARMCC, GCC, IAR" name="config/hpl_oscctrl_config.h"/>
         <file attr="config" category="header" condition="ARMCC, GCC, IAR" name="config/hpl_port_config.h"/>
+        <file attr="config" category="header" condition="ARMCC, GCC, IAR" name="config/hpl_sercom_config.h"/>
         <file attr="config" category="header" condition="ARMCC, GCC, IAR" name="config/hpl_usb_config.h"/>
         <file attr="config" category="header" condition="ARMCC, GCC, IAR" name="config/peripheral_clk_config.h"/>
         <file attr="config" category="header" condition="ARMCC, GCC, IAR" name="config/usbd_config.h"/>
@@ -198,6 +218,7 @@
         <file category="include" condition="ARMCC, GCC, IAR" name="hpl/pm"/>
         <file category="include" condition="ARMCC, GCC, IAR" name="hpl/port"/>
         <file category="include" condition="ARMCC, GCC, IAR" name="hpl/ramecc"/>
+        <file category="include" condition="ARMCC, GCC, IAR" name="hpl/sercom"/>
         <file category="include" condition="ARMCC, GCC, IAR" name="hpl/usb"/>
         <file category="include" condition="ARMCC, GCC, IAR" name="hri"/>
         <file category="include" condition="ARMCC, GCC, IAR" name=""/>
diff --git a/sysmoOCTSIM/armcc/Makefile b/sysmoOCTSIM/armcc/Makefile
index a131e45..3a130a8 100644
--- a/sysmoOCTSIM/armcc/Makefile
+++ b/sysmoOCTSIM/armcc/Makefile
@@ -37,11 +37,12 @@
 usb \
 armcc/arm_addon/armcc/arm \
 hal/utils/src \
-armcc/arm_addon/armcc \
+hpl/sercom \
 examples \
 hpl/gclk \
 usb/device \
 hpl/oscctrl \
+armcc/arm_addon/armcc \
 hpl/usb \
 hpl/core \
 hpl/cmcc
@@ -62,6 +63,7 @@
 hal/utils/src/utils_assert.o \
 usb_start.o \
 hpl/oscctrl/hpl_oscctrl.o \
+hal/src/hal_usart_sync.o \
 hpl/mclk/hpl_mclk.o \
 hpl/ramecc/hpl_ramecc.o \
 usb/usb_protocol.o \
@@ -70,6 +72,7 @@
 hpl/osc32kctrl/hpl_osc32kctrl.o \
 examples/driver_examples.o \
 driver_init.o \
+hpl/sercom/hpl_sercom.o \
 hal/src/hal_gpio.o \
 hal/utils/src/utils_event.o \
 hal/src/hal_sleep.o \
@@ -96,6 +99,7 @@
 "hal/utils/src/utils_assert.o" \
 "usb_start.o" \
 "hpl/oscctrl/hpl_oscctrl.o" \
+"hal/src/hal_usart_sync.o" \
 "hpl/mclk/hpl_mclk.o" \
 "hpl/ramecc/hpl_ramecc.o" \
 "usb/usb_protocol.o" \
@@ -104,6 +108,7 @@
 "hpl/osc32kctrl/hpl_osc32kctrl.o" \
 "examples/driver_examples.o" \
 "driver_init.o" \
+"hpl/sercom/hpl_sercom.o" \
 "hal/src/hal_gpio.o" \
 "hal/utils/src/utils_event.o" \
 "hal/src/hal_sleep.o" \
@@ -138,6 +143,7 @@
 "hal/src/hal_usb_device.d" \
 "hpl/dmac/hpl_dmac.d" \
 "hal/src/hal_init.d" \
+"hal/src/hal_usart_sync.d" \
 "usb_cdc_echo_main.d" \
 "hpl/mclk/hpl_mclk.d" \
 "driver_init.d" \
@@ -145,6 +151,7 @@
 "examples/driver_examples.d" \
 "hal/src/hal_cache.d" \
 "hal/src/hal_sleep.d" \
+"hpl/sercom/hpl_sercom.d" \
 "hal/src/hal_gpio.d" \
 "hal/src/hal_atomic.d" \
 "usb/device/usbdc.d" \
@@ -186,7 +193,7 @@
 	@echo Building file: $<
 	@echo ARMCC Compiler
 	$(QUOTE)armcc$(QUOTE) --c99 -c -DDEBUG -O1 -g --apcs=interwork --split_sections --cpu Cortex-M4 -D__SAME54P20A__ \
--I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
+-I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/sercom" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
 --depend "$@"  -o "$@" "$<"
 
 	@echo Finished building: $<
@@ -195,7 +202,7 @@
 	@echo Building file: $<
 	@echo ARMCC Assembler
 	$(QUOTE)armasm$(QUOTE) -g --apcs=interwork --cpu Cortex-M4 --pd "D__SAME54P20A__ SETA 1" \
--I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
+-I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/sercom" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
 --depend "$(@:%.o=%.d)" -o "$@" "$<"
 
 	@echo Finished building: $<
@@ -204,7 +211,7 @@
 	@echo Building file: $<
 	@echo ARMCC Preprocessing Assembler
 	$(QUOTE)armcc$(QUOTE) --c99 -c -DDEBUG -O1 -g --apcs=interwork --split_sections --cpu Cortex-M4 -D__SAME54P20A__ \
--I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
+-I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/sercom" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
 --depend "$@"  -o "$@" "$<"
 
 	@echo Finished building: $<
diff --git a/sysmoOCTSIM/atmel_start_config.atstart b/sysmoOCTSIM/atmel_start_config.atstart
index 3899d79..cb7826a 100644
--- a/sysmoOCTSIM/atmel_start_config.atstart
+++ b/sysmoOCTSIM/atmel_start_config.atstart
@@ -957,6 +957,51 @@
     variant: null
     clocks:
       domain_group: null
+  UART_debug:
+    user_label: UART_debug
+    definition: Atmel:SAME54_Drivers:0.0.1::SAME54P20A-AU::SERCOM2::driver_config_definition::UART::HAL:Driver:USART.Sync
+    functionality: USART
+    api: HAL:Driver:USART_Sync
+    configuration:
+      usart_advanced: false
+      usart_arch_clock_mode: USART with internal clock
+      usart_arch_cloden: false
+      usart_arch_dbgstop: Keep running
+      usart_arch_dord: LSB is transmitted first
+      usart_arch_enc: No encoding
+      usart_arch_fractional: 0
+      usart_arch_ibon: false
+      usart_arch_lin_slave_enable: Disable
+      usart_arch_runstdby: false
+      usart_arch_sampa: 7-8-9 (3-4-5 8-bit over-sampling)
+      usart_arch_sampr: 16x arithmetic
+      usart_arch_sfde: false
+      usart_baud_rate: 921600
+      usart_character_size: 8 bits
+      usart_parity: No parity
+      usart_rx_enable: true
+      usart_stop_bit: One stop bit
+      usart_tx_enable: true
+    optional_signals: []
+    variant:
+      specification: TXPO=0, RXPO=1, CMODE=0
+      required_signals:
+      - name: SERCOM2/PAD/0
+        pad: PB25
+        label: TX
+      - name: SERCOM2/PAD/1
+        pad: PB24
+        label: RX
+    clocks:
+      domain_group:
+        nodes:
+        - name: Core
+          input: Generic clock generator 2
+        - name: Slow
+          input: Generic clock generator 3
+        configuration:
+          core_gclk_selection: Generic clock generator 2
+          slow_gclk_selection: Generic clock generator 3
   USB_DEVICE_INSTANCE:
     user_label: USB_DEVICE_INSTANCE
     definition: Atmel:SAME54_Drivers:0.0.1::SAME54P20A-AU::USB::driver_config_definition::USB.Device::HAL:Driver:USB.Device
@@ -1011,4 +1056,16 @@
     mode: Advanced
     user_label: PA25
     configuration: {}
+  PB24:
+    name: PB24
+    definition: Atmel:SAME54_Drivers:0.0.1::SAME54P20A-AU::pad::PB24
+    mode: Peripheral IO
+    user_label: PB24
+    configuration: null
+  PB25:
+    name: PB25
+    definition: Atmel:SAME54_Drivers:0.0.1::SAME54P20A-AU::pad::PB25
+    mode: Peripheral IO
+    user_label: PB25
+    configuration: null
 toolchain_options: []
diff --git a/sysmoOCTSIM/atmel_start_pins.h b/sysmoOCTSIM/atmel_start_pins.h
index dbf9891..3631847 100644
--- a/sysmoOCTSIM/atmel_start_pins.h
+++ b/sysmoOCTSIM/atmel_start_pins.h
@@ -29,5 +29,7 @@
 
 #define PA24 GPIO(GPIO_PORTA, 24)
 #define PA25 GPIO(GPIO_PORTA, 25)
+#define PB24 GPIO(GPIO_PORTB, 24)
+#define PB25 GPIO(GPIO_PORTB, 25)
 
 #endif // ATMEL_START_PINS_H_INCLUDED
diff --git a/sysmoOCTSIM/config/hpl_gclk_config.h b/sysmoOCTSIM/config/hpl_gclk_config.h
index 0ad8ead..12c1539 100644
--- a/sysmoOCTSIM/config/hpl_gclk_config.h
+++ b/sysmoOCTSIM/config/hpl_gclk_config.h
@@ -218,7 +218,7 @@
 // <i> Indicates whether Generic Clock Generator Enable is enabled or not
 // <id> gclk_arch_gen_2_enable
 #ifndef CONF_GCLK_GEN_2_GENEN
-#define CONF_GCLK_GEN_2_GENEN 0
+#define CONF_GCLK_GEN_2_GENEN 1
 #endif
 // </h>
 
diff --git a/sysmoOCTSIM/config/hpl_sercom_config.h b/sysmoOCTSIM/config/hpl_sercom_config.h
new file mode 100644
index 0000000..e154ce2
--- /dev/null
+++ b/sysmoOCTSIM/config/hpl_sercom_config.h
@@ -0,0 +1,278 @@
+/* Auto-generated config file hpl_sercom_config.h */
+#ifndef HPL_SERCOM_CONFIG_H
+#define HPL_SERCOM_CONFIG_H
+
+// <<< Use Configuration Wizard in Context Menu >>>
+
+#include <peripheral_clk_config.h>
+
+#ifndef CONF_SERCOM_2_USART_ENABLE
+#define CONF_SERCOM_2_USART_ENABLE 1
+#endif
+
+// <h> Basic Configuration
+
+// <q> Receive buffer enable
+// <i> Enable input buffer in SERCOM module
+// <id> usart_rx_enable
+#ifndef CONF_SERCOM_2_USART_RXEN
+#define CONF_SERCOM_2_USART_RXEN 1
+#endif
+
+// <q> Transmitt buffer enable
+// <i> Enable output buffer in SERCOM module
+// <id> usart_tx_enable
+#ifndef CONF_SERCOM_2_USART_TXEN
+#define CONF_SERCOM_2_USART_TXEN 1
+#endif
+
+// <o> Frame parity
+// <0x0=>No parity
+// <0x1=>Even parity
+// <0x2=>Odd parity
+// <i> Parity bit mode for USART frame
+// <id> usart_parity
+#ifndef CONF_SERCOM_2_USART_PARITY
+#define CONF_SERCOM_2_USART_PARITY 0x0
+#endif
+
+// <o> Character Size
+// <0x0=>8 bits
+// <0x1=>9 bits
+// <0x5=>5 bits
+// <0x6=>6 bits
+// <0x7=>7 bits
+// <i> Data character size in USART frame
+// <id> usart_character_size
+#ifndef CONF_SERCOM_2_USART_CHSIZE
+#define CONF_SERCOM_2_USART_CHSIZE 0x0
+#endif
+
+// <o> Stop Bit
+// <0=>One stop bit
+// <1=>Two stop bits
+// <i> Number of stop bits in USART frame
+// <id> usart_stop_bit
+#ifndef CONF_SERCOM_2_USART_SBMODE
+#define CONF_SERCOM_2_USART_SBMODE 0
+#endif
+
+// <o> Baud rate <1-6250000>
+// <i> USART baud rate setting
+// <id> usart_baud_rate
+#ifndef CONF_SERCOM_2_USART_BAUD
+#define CONF_SERCOM_2_USART_BAUD 921600
+#endif
+
+// </h>
+
+// <e> Advanced configuration
+// <id> usart_advanced
+#ifndef CONF_SERCOM_2_USART_ADVANCED_CONFIG
+#define CONF_SERCOM_2_USART_ADVANCED_CONFIG 0
+#endif
+
+// <q> Run in stand-by
+// <i> Keep the module running in standby sleep mode
+// <id> usart_arch_runstdby
+#ifndef CONF_SERCOM_2_USART_RUNSTDBY
+#define CONF_SERCOM_2_USART_RUNSTDBY 0
+#endif
+
+// <q> Immediate Buffer Overflow Notification
+// <i> Controls when the BUFOVF status bit is asserted
+// <id> usart_arch_ibon
+#ifndef CONF_SERCOM_2_USART_IBON
+#define CONF_SERCOM_2_USART_IBON 0
+#endif
+
+// <q> Start of Frame Detection Enable
+// <i> Will wake the device from any sleep mode if usart_init and usart_enable was run priort to going to sleep. (receive buffer must be enabled)
+// <id> usart_arch_sfde
+#ifndef CONF_SERCOM_2_USART_SFDE
+#define CONF_SERCOM_2_USART_SFDE 0
+#endif
+
+// <q> Collision Detection Enable
+// <i> Collision detection enable
+// <id> usart_arch_cloden
+#ifndef CONF_SERCOM_2_USART_CLODEN
+#define CONF_SERCOM_2_USART_CLODEN 0
+#endif
+
+// <o> Operating Mode
+// <0x0=>USART with external clock
+// <0x1=>USART with internal clock
+// <i> Drive the shift register by an internal clock generated by the baud rate generator or an external clock supplied on the XCK pin.
+// <id> usart_arch_clock_mode
+#ifndef CONF_SERCOM_2_USART_MODE
+#define CONF_SERCOM_2_USART_MODE 0x1
+#endif
+
+// <o> Sample Rate
+// <0x0=>16x arithmetic
+// <0x1=>16x fractional
+// <0x2=>8x arithmetic
+// <0x3=>8x fractional
+// <0x4=>3x arithmetic
+// <i> How many over-sampling bits used when sampling data state
+// <id> usart_arch_sampr
+#ifndef CONF_SERCOM_2_USART_SAMPR
+#define CONF_SERCOM_2_USART_SAMPR 0x0
+#endif
+
+// <o> Sample Adjustment
+// <0x0=>7-8-9 (3-4-5 8-bit over-sampling)
+// <0x1=>9-10-11 (4-5-6 8-bit over-sampling)
+// <0x2=>11-12-13 (5-6-7 8-bit over-sampling)
+// <0x3=>13-14-15 (6-7-8 8-bit over-sampling)
+// <i> Adjust which samples to use for data sampling in asynchronous mode
+// <id> usart_arch_sampa
+#ifndef CONF_SERCOM_2_USART_SAMPA
+#define CONF_SERCOM_2_USART_SAMPA 0x0
+#endif
+
+// <o> Fractional Part <0-7>
+// <i> Fractional part of the baud rate if baud rate generator is in fractional mode
+// <id> usart_arch_fractional
+#ifndef CONF_SERCOM_2_USART_FRACTIONAL
+#define CONF_SERCOM_2_USART_FRACTIONAL 0x0
+#endif
+
+// <o> Data Order
+// <0=>MSB is transmitted first
+// <1=>LSB is transmitted first
+// <i> Data order of the data bits in the frame
+// <id> usart_arch_dord
+#ifndef CONF_SERCOM_2_USART_DORD
+#define CONF_SERCOM_2_USART_DORD 1
+#endif
+
+// Does not do anything in UART mode
+#define CONF_SERCOM_2_USART_CPOL 0
+
+// <o> Encoding Format
+// <0=>No encoding
+// <1=>IrDA encoded
+// <id> usart_arch_enc
+#ifndef CONF_SERCOM_2_USART_ENC
+#define CONF_SERCOM_2_USART_ENC 0
+#endif
+
+// <o> LIN Slave Enable
+// <i> Break Character Detection and Auto-Baud/LIN Slave Enable.
+// <i> Additional setting needed: 16x sample rate using fractional baud rate generation (CTRLA.SAMPR = 1).
+// <0=>Disable
+// <1=>Enable
+// <id> usart_arch_lin_slave_enable
+#ifndef CONF_SERCOM_2_USART_LIN_SLAVE_ENABLE
+#define CONF_SERCOM_2_USART_LIN_SLAVE_ENABLE 0
+#endif
+
+// <o> Debug Stop Mode
+// <i> Behavior of the baud-rate generator when CPU is halted by external debugger.
+// <0=>Keep running
+// <1=>Halt
+// <id> usart_arch_dbgstop
+#ifndef CONF_SERCOM_2_USART_DEBUG_STOP_MODE
+#define CONF_SERCOM_2_USART_DEBUG_STOP_MODE 0
+#endif
+
+// </e>
+
+#ifndef CONF_SERCOM_2_USART_INACK
+#define CONF_SERCOM_2_USART_INACK 0x0
+#endif
+
+#ifndef CONF_SERCOM_2_USART_DSNACK
+#define CONF_SERCOM_2_USART_DSNACK 0x0
+#endif
+
+#ifndef CONF_SERCOM_2_USART_MAXITER
+#define CONF_SERCOM_2_USART_MAXITER 0x7
+#endif
+
+#ifndef CONF_SERCOM_2_USART_GTIME
+#define CONF_SERCOM_2_USART_GTIME 0x2
+#endif
+
+#define CONF_SERCOM_2_USART_RXINV 0x0
+#define CONF_SERCOM_2_USART_TXINV 0x0
+
+#ifndef CONF_SERCOM_2_USART_CMODE
+#define CONF_SERCOM_2_USART_CMODE 0
+#endif
+
+#ifndef CONF_SERCOM_2_USART_RXPO
+#define CONF_SERCOM_2_USART_RXPO 1 /* RX is on PIN_PB24 */
+#endif
+
+#ifndef CONF_SERCOM_2_USART_TXPO
+#define CONF_SERCOM_2_USART_TXPO 0 /* TX is on PIN_PB25 */
+#endif
+
+/* Set correct parity settings in register interface based on PARITY setting */
+#if CONF_SERCOM_2_USART_LIN_SLAVE_ENABLE == 1
+#if CONF_SERCOM_2_USART_PARITY == 0
+#define CONF_SERCOM_2_USART_PMODE 0
+#define CONF_SERCOM_2_USART_FORM 4
+#else
+#define CONF_SERCOM_2_USART_PMODE CONF_SERCOM_2_USART_PARITY - 1
+#define CONF_SERCOM_2_USART_FORM 5
+#endif
+#else /* #if CONF_SERCOM_2_USART_LIN_SLAVE_ENABLE == 0 */
+#if CONF_SERCOM_2_USART_PARITY == 0
+#define CONF_SERCOM_2_USART_PMODE 0
+#define CONF_SERCOM_2_USART_FORM 0
+#else
+#define CONF_SERCOM_2_USART_PMODE CONF_SERCOM_2_USART_PARITY - 1
+#define CONF_SERCOM_2_USART_FORM 1
+#endif
+#endif
+
+// Calculate BAUD register value in UART mode
+#if CONF_SERCOM_2_USART_SAMPR == 0
+#ifndef CONF_SERCOM_2_USART_BAUD_RATE
+#define CONF_SERCOM_2_USART_BAUD_RATE                                                                                  \
+	65536 - ((65536 * 16.0f * CONF_SERCOM_2_USART_BAUD) / CONF_GCLK_SERCOM2_CORE_FREQUENCY)
+#endif
+#ifndef CONF_SERCOM_2_USART_RECEIVE_PULSE_LENGTH
+#define CONF_SERCOM_2_USART_RECEIVE_PULSE_LENGTH 0
+#endif
+#elif CONF_SERCOM_2_USART_SAMPR == 1
+#ifndef CONF_SERCOM_2_USART_BAUD_RATE
+#define CONF_SERCOM_2_USART_BAUD_RATE                                                                                  \
+	((CONF_GCLK_SERCOM2_CORE_FREQUENCY) / (CONF_SERCOM_2_USART_BAUD * 16)) - (CONF_SERCOM_2_USART_FRACTIONAL / 8)
+#endif
+#ifndef CONF_SERCOM_2_USART_RECEIVE_PULSE_LENGTH
+#define CONF_SERCOM_2_USART_RECEIVE_PULSE_LENGTH 0
+#endif
+#elif CONF_SERCOM_2_USART_SAMPR == 2
+#ifndef CONF_SERCOM_2_USART_BAUD_RATE
+#define CONF_SERCOM_2_USART_BAUD_RATE                                                                                  \
+	65536 - ((65536 * 8.0f * CONF_SERCOM_2_USART_BAUD) / CONF_GCLK_SERCOM2_CORE_FREQUENCY)
+#endif
+#ifndef CONF_SERCOM_2_USART_RECEIVE_PULSE_LENGTH
+#define CONF_SERCOM_2_USART_RECEIVE_PULSE_LENGTH 0
+#endif
+#elif CONF_SERCOM_2_USART_SAMPR == 3
+#ifndef CONF_SERCOM_2_USART_BAUD_RATE
+#define CONF_SERCOM_2_USART_BAUD_RATE                                                                                  \
+	((CONF_GCLK_SERCOM2_CORE_FREQUENCY) / (CONF_SERCOM_2_USART_BAUD * 8)) - (CONF_SERCOM_2_USART_FRACTIONAL / 8)
+#endif
+#ifndef CONF_SERCOM_2_USART_RECEIVE_PULSE_LENGTH
+#define CONF_SERCOM_2_USART_RECEIVE_PULSE_LENGTH 0
+#endif
+#elif CONF_SERCOM_2_USART_SAMPR == 4
+#ifndef CONF_SERCOM_2_USART_BAUD_RATE
+#define CONF_SERCOM_2_USART_BAUD_RATE                                                                                  \
+	65536 - ((65536 * 3.0f * CONF_SERCOM_2_USART_BAUD) / CONF_GCLK_SERCOM2_CORE_FREQUENCY)
+#endif
+#ifndef CONF_SERCOM_2_USART_RECEIVE_PULSE_LENGTH
+#define CONF_SERCOM_2_USART_RECEIVE_PULSE_LENGTH 0
+#endif
+#endif
+
+// <<< end of configuration section >>>
+
+#endif // HPL_SERCOM_CONFIG_H
diff --git a/sysmoOCTSIM/config/peripheral_clk_config.h b/sysmoOCTSIM/config/peripheral_clk_config.h
index 8078e4b..c9852b6 100644
--- a/sysmoOCTSIM/config/peripheral_clk_config.h
+++ b/sysmoOCTSIM/config/peripheral_clk_config.h
@@ -12,6 +12,86 @@
 #define CONF_CPU_FREQUENCY 120000000
 #endif
 
+// <y> Core Clock Source
+// <id> core_gclk_selection
+
+// <GCLK_PCHCTRL_GEN_GCLK0_Val"> Generic clock generator 0
+
+// <GCLK_PCHCTRL_GEN_GCLK1_Val"> Generic clock generator 1
+
+// <GCLK_PCHCTRL_GEN_GCLK2_Val"> Generic clock generator 2
+
+// <GCLK_PCHCTRL_GEN_GCLK3_Val"> Generic clock generator 3
+
+// <GCLK_PCHCTRL_GEN_GCLK4_Val"> Generic clock generator 4
+
+// <GCLK_PCHCTRL_GEN_GCLK5_Val"> Generic clock generator 5
+
+// <GCLK_PCHCTRL_GEN_GCLK6_Val"> Generic clock generator 6
+
+// <GCLK_PCHCTRL_GEN_GCLK7_Val"> Generic clock generator 7
+
+// <GCLK_PCHCTRL_GEN_GCLK8_Val"> Generic clock generator 8
+
+// <GCLK_PCHCTRL_GEN_GCLK9_Val"> Generic clock generator 9
+
+// <GCLK_PCHCTRL_GEN_GCLK10_Val"> Generic clock generator 10
+
+// <GCLK_PCHCTRL_GEN_GCLK11_Val"> Generic clock generator 11
+
+// <i> Select the clock source for CORE.
+#ifndef CONF_GCLK_SERCOM2_CORE_SRC
+#define CONF_GCLK_SERCOM2_CORE_SRC GCLK_PCHCTRL_GEN_GCLK2_Val
+#endif
+
+// <y> Slow Clock Source
+// <id> slow_gclk_selection
+
+// <GCLK_PCHCTRL_GEN_GCLK0_Val"> Generic clock generator 0
+
+// <GCLK_PCHCTRL_GEN_GCLK1_Val"> Generic clock generator 1
+
+// <GCLK_PCHCTRL_GEN_GCLK2_Val"> Generic clock generator 2
+
+// <GCLK_PCHCTRL_GEN_GCLK3_Val"> Generic clock generator 3
+
+// <GCLK_PCHCTRL_GEN_GCLK4_Val"> Generic clock generator 4
+
+// <GCLK_PCHCTRL_GEN_GCLK5_Val"> Generic clock generator 5
+
+// <GCLK_PCHCTRL_GEN_GCLK6_Val"> Generic clock generator 6
+
+// <GCLK_PCHCTRL_GEN_GCLK7_Val"> Generic clock generator 7
+
+// <GCLK_PCHCTRL_GEN_GCLK8_Val"> Generic clock generator 8
+
+// <GCLK_PCHCTRL_GEN_GCLK9_Val"> Generic clock generator 9
+
+// <GCLK_PCHCTRL_GEN_GCLK10_Val"> Generic clock generator 10
+
+// <GCLK_PCHCTRL_GEN_GCLK11_Val"> Generic clock generator 11
+
+// <i> Select the slow clock source.
+#ifndef CONF_GCLK_SERCOM2_SLOW_SRC
+#define CONF_GCLK_SERCOM2_SLOW_SRC GCLK_PCHCTRL_GEN_GCLK3_Val
+#endif
+
+/**
+ * \def CONF_GCLK_SERCOM2_CORE_FREQUENCY
+ * \brief SERCOM2's Core Clock frequency
+ */
+#ifndef CONF_GCLK_SERCOM2_CORE_FREQUENCY
+#define CONF_GCLK_SERCOM2_CORE_FREQUENCY 100000000
+#endif
+
+/**
+ * \def CONF_GCLK_SERCOM2_SLOW_FREQUENCY
+ * \brief SERCOM2's Slow Clock frequency
+ */
+#ifndef CONF_GCLK_SERCOM2_SLOW_FREQUENCY
+#define CONF_GCLK_SERCOM2_SLOW_FREQUENCY 32768
+#endif
+
 // <y> USB Clock Source
 // <id> usb_gclk_selection
 
diff --git a/sysmoOCTSIM/driver_init.c b/sysmoOCTSIM/driver_init.c
index 920593a..72f2c88 100644
--- a/sysmoOCTSIM/driver_init.c
+++ b/sysmoOCTSIM/driver_init.c
@@ -11,6 +11,31 @@
 #include <utils.h>
 #include <hal_init.h>
 
+struct usart_sync_descriptor UART_debug;
+
+void UART_debug_PORT_init(void)
+{
+
+	gpio_set_pin_function(PB25, PINMUX_PB25D_SERCOM2_PAD0);
+
+	gpio_set_pin_function(PB24, PINMUX_PB24D_SERCOM2_PAD1);
+}
+
+void UART_debug_CLOCK_init(void)
+{
+	hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM2_GCLK_ID_CORE, CONF_GCLK_SERCOM2_CORE_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
+	hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM2_GCLK_ID_SLOW, CONF_GCLK_SERCOM2_SLOW_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
+
+	hri_mclk_set_APBBMASK_SERCOM2_bit(MCLK);
+}
+
+void UART_debug_init(void)
+{
+	UART_debug_CLOCK_init();
+	usart_sync_init(&UART_debug, SERCOM2, (void *)NULL);
+	UART_debug_PORT_init();
+}
+
 void USB_DEVICE_INSTANCE_PORT_init(void)
 {
 
@@ -130,5 +155,7 @@
 {
 	init_mcu();
 
+	UART_debug_init();
+
 	USB_DEVICE_INSTANCE_init();
 }
diff --git a/sysmoOCTSIM/driver_init.h b/sysmoOCTSIM/driver_init.h
index 5c029a4..7067684 100644
--- a/sysmoOCTSIM/driver_init.h
+++ b/sysmoOCTSIM/driver_init.h
@@ -21,8 +21,16 @@
 #include <hal_io.h>
 #include <hal_sleep.h>
 
+#include <hal_usart_sync.h>
+
 #include "hal_usb_device.h"
 
+extern struct usart_sync_descriptor UART_debug;
+
+void UART_debug_PORT_init(void);
+void UART_debug_CLOCK_init(void);
+void UART_debug_init(void);
+
 void USB_DEVICE_INSTANCE_CLOCK_init(void);
 void USB_DEVICE_INSTANCE_init(void);
 
diff --git a/sysmoOCTSIM/examples/driver_examples.c b/sysmoOCTSIM/examples/driver_examples.c
index 69d50de..56247ff 100644
--- a/sysmoOCTSIM/examples/driver_examples.c
+++ b/sysmoOCTSIM/examples/driver_examples.c
@@ -9,3 +9,15 @@
 #include "driver_examples.h"
 #include "driver_init.h"
 #include "utils.h"
+
+/**
+ * Example of using UART_debug to write "Hello World" using the IO abstraction.
+ */
+void UART_debug_example(void)
+{
+	struct io_descriptor *io;
+	usart_sync_get_io_descriptor(&UART_debug, &io);
+	usart_sync_enable(&UART_debug);
+
+	io_write(io, (uint8_t *)"Hello World!", 12);
+}
diff --git a/sysmoOCTSIM/examples/driver_examples.h b/sysmoOCTSIM/examples/driver_examples.h
index ef1c619..7bb60eb 100644
--- a/sysmoOCTSIM/examples/driver_examples.h
+++ b/sysmoOCTSIM/examples/driver_examples.h
@@ -12,6 +12,8 @@
 extern "C" {
 #endif
 
+void UART_debug_example(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/sysmoOCTSIM/gcc/Makefile b/sysmoOCTSIM/gcc/Makefile
index 6542661..aeae7a5 100644
--- a/sysmoOCTSIM/gcc/Makefile
+++ b/sysmoOCTSIM/gcc/Makefile
@@ -36,6 +36,7 @@
 hpl/mclk \
 usb \
 hal/utils/src \
+hpl/sercom \
 examples \
 hpl/gclk \
 usb/device \
@@ -62,6 +63,7 @@
 hal/utils/src/utils_assert.o \
 usb_start.o \
 hpl/oscctrl/hpl_oscctrl.o \
+hal/src/hal_usart_sync.o \
 hpl/mclk/hpl_mclk.o \
 hpl/ramecc/hpl_ramecc.o \
 usb/usb_protocol.o \
@@ -71,6 +73,7 @@
 hpl/osc32kctrl/hpl_osc32kctrl.o \
 examples/driver_examples.o \
 driver_init.o \
+hpl/sercom/hpl_sercom.o \
 hal/src/hal_gpio.o \
 hal/utils/src/utils_event.o \
 hal/src/hal_sleep.o \
@@ -97,6 +100,7 @@
 "hal/utils/src/utils_assert.o" \
 "usb_start.o" \
 "hpl/oscctrl/hpl_oscctrl.o" \
+"hal/src/hal_usart_sync.o" \
 "hpl/mclk/hpl_mclk.o" \
 "hpl/ramecc/hpl_ramecc.o" \
 "usb/usb_protocol.o" \
@@ -106,6 +110,7 @@
 "hpl/osc32kctrl/hpl_osc32kctrl.o" \
 "examples/driver_examples.o" \
 "driver_init.o" \
+"hpl/sercom/hpl_sercom.o" \
 "hal/src/hal_gpio.o" \
 "hal/utils/src/utils_event.o" \
 "hal/src/hal_sleep.o" \
@@ -140,6 +145,7 @@
 "hal/src/hal_usb_device.d" \
 "hpl/dmac/hpl_dmac.d" \
 "hal/src/hal_init.d" \
+"hal/src/hal_usart_sync.d" \
 "usb_cdc_echo_main.d" \
 "hpl/mclk/hpl_mclk.d" \
 "driver_init.d" \
@@ -147,6 +153,7 @@
 "examples/driver_examples.d" \
 "hal/src/hal_cache.d" \
 "hal/src/hal_sleep.d" \
+"hpl/sercom/hpl_sercom.d" \
 "hal/src/hal_gpio.d" \
 "hal/src/hal_atomic.d" \
 "usb/device/usbdc.d" \
@@ -199,7 +206,7 @@
 	@echo ARM/GNU C Compiler
 	$(QUOTE)arm-none-eabi-gcc$(QUOTE) -x c -mthumb -DDEBUG -Os -ffunction-sections -mlong-calls -g3 -Wall -c -std=gnu99 \
 -D__SAME54P20A__ -mcpu=cortex-m4 -mfloat-abi=softfp -mfpu=fpv4-sp-d16 \
--I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
+-I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/sercom" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
 -MD -MP -MF "$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -MT"$(@:%.o=%.o)"  -o "$@" "$<"
 	@echo Finished building: $<
 
@@ -208,7 +215,7 @@
 	@echo ARM/GNU Assembler
 	$(QUOTE)arm-none-eabi-as$(QUOTE) -x c -mthumb -DDEBUG -Os -ffunction-sections -mlong-calls -g3 -Wall -c -std=gnu99 \
 -D__SAME54P20A__ -mcpu=cortex-m4 -mfloat-abi=softfp -mfpu=fpv4-sp-d16 \
--I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
+-I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/sercom" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
 -MD -MP -MF "$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -MT"$(@:%.o=%.o)"  -o "$@" "$<"
 	@echo Finished building: $<
 
@@ -217,7 +224,7 @@
 	@echo ARM/GNU Preprocessing Assembler
 	$(QUOTE)arm-none-eabi-gcc$(QUOTE) -x c -mthumb -DDEBUG -Os -ffunction-sections -mlong-calls -g3 -Wall -c -std=gnu99 \
 -D__SAME54P20A__ -mcpu=cortex-m4 -mfloat-abi=softfp -mfpu=fpv4-sp-d16 \
--I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
+-I"../" -I"../config" -I"../examples" -I"../hal/include" -I"../hal/utils/include" -I"../hpl/cmcc" -I"../hpl/core" -I"../hpl/dmac" -I"../hpl/gclk" -I"../hpl/mclk" -I"../hpl/osc32kctrl" -I"../hpl/oscctrl" -I"../hpl/pm" -I"../hpl/port" -I"../hpl/ramecc" -I"../hpl/sercom" -I"../hpl/usb" -I"../hri" -I"../" -I"../config" -I"../usb" -I"../usb/class/cdc" -I"../usb/class/cdc/device" -I"../usb/device" -I"../" -I"../CMSIS/Include" -I"../include"  \
 -MD -MP -MF "$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -MT"$(@:%.o=%.o)"  -o "$@" "$<"
 	@echo Finished building: $<
 
diff --git a/sysmoOCTSIM/hal/documentation/usart_sync.rst b/sysmoOCTSIM/hal/documentation/usart_sync.rst
new file mode 100644
index 0000000..15e4b13
--- /dev/null
+++ b/sysmoOCTSIM/hal/documentation/usart_sync.rst
@@ -0,0 +1,58 @@
+The USART Synchronous Driver
+============================
+
+The universal synchronous and asynchronous receiver and transmitter
+(USART) is usually used to transfer data from one device to the other.
+
+User can set action for flow control pins by function usart_set_flow_control,
+if the flow control is enabled. All the available states are defined in union
+usart_flow_control_state.
+
+Note that user can set state of flow control pins only if automatic support of
+the flow control is not supported by the hardware.
+
+Features
+--------
+
+* Initialization/de-initialization
+* Enabling/disabling
+* Control of the following settings:
+
+  * Baudrate
+  * UART or USRT communication mode
+  * Character size
+  * Data order
+  * Flow control
+* Data transfer: transmission, reception
+
+Applications
+------------
+
+They are commonly used in a terminal application or low-speed communication
+between devices.
+
+Dependencies
+------------
+
+USART capable hardware.
+
+Concurrency
+-----------
+
+Write buffer should not be changed while data is being sent.
+
+
+Limitations
+-----------
+
+* The driver does not support 9-bit character size.
+* The "USART with ISO7816" mode can be only used in ISO7816 capable devices. 
+  And the SCK pin can't be set directly. Application can use a GCLK output PIN
+  to generate SCK. For example to communicate with a SMARTCARD with ISO7816
+  (F = 372 ; D = 1), and baudrate=9600, the SCK pin output frequency should be
+  config as 372*9600=3571200Hz. More information can be refer to ISO7816 Specification.
+
+Known issues and workarounds
+----------------------------
+
+N/A
diff --git a/sysmoOCTSIM/hal/include/hal_usart_sync.h b/sysmoOCTSIM/hal/include/hal_usart_sync.h
new file mode 100644
index 0000000..1ef22fc
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hal_usart_sync.h
@@ -0,0 +1,247 @@
+/**
+ * \file
+ *
+ * \brief USART related functionality declaration.
+ *
+ * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HAL_SYNC_USART_H_INCLUDED
+#define _HAL_SYNC_USART_H_INCLUDED
+
+#include "hal_io.h"
+#include <hpl_usart_sync.h>
+
+/**
+ * \addtogroup doc_driver_hal_usart_sync
+ *
+ * @{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Synchronous USART descriptor
+ */
+struct usart_sync_descriptor {
+	struct io_descriptor      io;
+	struct _usart_sync_device device;
+};
+
+/**
+ * \brief Initialize USART interface
+ *
+ * This function initializes the given I/O descriptor to be used
+ * as USART interface descriptor.
+ * It checks if the given hardware is not initialized and
+ * if the given hardware is permitted to be initialized.
+ *
+ * \param[out] descr A USART descriptor which is used to communicate via USART
+ * \param[in] hw The pointer to hardware instance
+ * \param[in] func The pointer to as set of functions pointers
+ *
+ * \return Initialization status.
+ */
+int32_t usart_sync_init(struct usart_sync_descriptor *const descr, void *const hw, void *const func);
+
+/**
+ * \brief Deinitialize USART interface
+ *
+ * This function deinitializes the given I/O descriptor.
+ * It checks if the given hardware is initialized and
+ * if the given hardware is permitted to be deinitialized.
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ *
+ * \return De-initialization status.
+ */
+int32_t usart_sync_deinit(struct usart_sync_descriptor *const descr);
+
+/**
+ * \brief Enable USART interface
+ *
+ * Enables the USART interface
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ *
+ * \return Enabling status.
+ */
+int32_t usart_sync_enable(struct usart_sync_descriptor *const descr);
+
+/**
+ * \brief Disable USART interface
+ *
+ * Disables the USART interface
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ *
+ * \return Disabling status.
+ */
+int32_t usart_sync_disable(struct usart_sync_descriptor *const descr);
+
+/**
+ * \brief Retrieve I/O descriptor
+ *
+ * This function retrieves the I/O descriptor of the given USART descriptor.
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[out] io An I/O descriptor to retrieve
+ *
+ * \return The status of the I/O descriptor retrieving.
+ */
+int32_t usart_sync_get_io_descriptor(struct usart_sync_descriptor *const descr, struct io_descriptor **io);
+
+/**
+ * \brief Specify action for flow control pins
+ *
+ * This function sets the action (or state) for the flow control pins
+ * if the flow control is enabled.
+ * It sets the state of flow control pins only if the automatic support of
+ * the flow control is not supported by the hardware.
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] state A state to set the flow control pins
+ *
+ * \return The status of flow control action setup.
+ */
+int32_t usart_sync_set_flow_control(struct usart_sync_descriptor *const  descr,
+                                    const union usart_flow_control_state state);
+
+/**
+ * \brief Set USART baud rate
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] baud_rate A baud rate to set
+ *
+ * \return The status of baud rate setting.
+ */
+int32_t usart_sync_set_baud_rate(struct usart_sync_descriptor *const descr, const uint32_t baud_rate);
+
+/**
+ * \brief Set USART data order
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] data_order A data order to set
+ *
+ * \return The status of data order setting.
+ */
+int32_t usart_sync_set_data_order(struct usart_sync_descriptor *const descr, const enum usart_data_order data_order);
+
+/**
+ * \brief Set USART mode
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] mode A mode to set
+ *
+ * \return The status of mode setting.
+ */
+int32_t usart_sync_set_mode(struct usart_sync_descriptor *const descr, const enum usart_mode mode);
+
+/**
+ * \brief Set USART parity
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] parity A parity to set
+ *
+ * \return The status of parity setting.
+ */
+int32_t usart_sync_set_parity(struct usart_sync_descriptor *const descr, const enum usart_parity parity);
+
+/**
+ * \brief Set USART stop bits
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] stop_bits Stop bits to set
+ *
+ * \return The status of stop bits setting.
+ */
+int32_t usart_sync_set_stopbits(struct usart_sync_descriptor *const descr, const enum usart_stop_bits stop_bits);
+
+/**
+ * \brief Set USART character size
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[in] size A character size to set
+ *
+ * \return The status of character size setting.
+ */
+int32_t usart_sync_set_character_size(struct usart_sync_descriptor *const descr, const enum usart_character_size size);
+
+/**
+ * \brief Retrieve the state of flow control pins
+ *
+ * This function retrieves the of flow control pins
+ * if the flow control is enabled.
+ * Function can return USART_FLOW_CONTROL_STATE_UNAVAILABLE in case
+ * if the flow control is done by the hardware
+ * and the pins state cannot be read out.
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ * \param[out] state The state of flow control pins
+ *
+ * \return The status of flow control state reading.
+ */
+int32_t usart_sync_flow_control_status(const struct usart_sync_descriptor *const descr,
+                                       union usart_flow_control_state *const     state);
+
+/**
+ * \brief Check if the USART transmitter is empty
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ *
+ * \return The status of USART TX empty checking.
+ * \retval 0 The USART transmitter is not empty
+ * \retval 1 The USART transmitter is empty
+ */
+int32_t usart_sync_is_tx_empty(const struct usart_sync_descriptor *const descr);
+
+/**
+ * \brief Check if the USART receiver is not empty
+ *
+ * \param[in] descr A USART descriptor which is used to communicate via USART
+ *
+ * \return The status of USART RX empty checking.
+ * \retval 1 The USART receiver is not empty
+ * \retval 0 The USART receiver is empty
+ */
+int32_t usart_sync_is_rx_not_empty(const struct usart_sync_descriptor *const descr);
+
+/**
+ * \brief Retrieve the current driver version
+ *
+ * \return Current driver version.
+ */
+uint32_t usart_sync_get_version(void);
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HAL_SYNC_USART_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_i2c_m_async.h b/sysmoOCTSIM/hal/include/hpl_i2c_m_async.h
new file mode 100644
index 0000000..8a9491d
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_i2c_m_async.h
@@ -0,0 +1,205 @@
+/**
+ * \file
+ *
+ * \brief I2C Master Hardware Proxy Layer(HPL) declaration.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_I2C_M_ASYNC_H_INCLUDED
+#define _HPL_I2C_M_ASYNC_H_INCLUDED
+
+#include "hpl_i2c_m_sync.h"
+#include "hpl_irq.h"
+#include "utils.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief i2c master callback names
+ */
+enum _i2c_m_async_callback_type {
+	I2C_M_ASYNC_DEVICE_ERROR,
+	I2C_M_ASYNC_DEVICE_TX_COMPLETE,
+	I2C_M_ASYNC_DEVICE_RX_COMPLETE
+};
+
+struct _i2c_m_async_device;
+
+typedef void (*_i2c_complete_cb_t)(struct _i2c_m_async_device *i2c_dev);
+typedef void (*_i2c_error_cb_t)(struct _i2c_m_async_device *i2c_dev, int32_t errcode);
+
+/**
+ * \brief i2c callback pointers structure
+ */
+struct _i2c_m_async_callback {
+	_i2c_error_cb_t    error;
+	_i2c_complete_cb_t tx_complete;
+	_i2c_complete_cb_t rx_complete;
+};
+
+/**
+ * \brief i2c device structure
+ */
+struct _i2c_m_async_device {
+	struct _i2c_m_service        service;
+	void *                       hw;
+	struct _i2c_m_async_callback cb;
+	struct _irq_descriptor       irq;
+};
+
+/**
+ * \name HPL functions
+ */
+
+/**
+ * \brief Initialize I2C in interrupt mode
+ *
+ * This function does low level I2C configuration.
+ *
+ * \param[in] i2c_dev The pointer to i2c interrupt device structure
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_init(struct _i2c_m_async_device *const i2c_dev, void *const hw);
+
+/**
+ * \brief Deinitialize I2C in interrupt mode
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_deinit(struct _i2c_m_async_device *const i2c_dev);
+
+/**
+ * \brief Enable I2C module
+ *
+ * This function does low level I2C enable.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_enable(struct _i2c_m_async_device *const i2c_dev);
+
+/**
+ * \brief Disable I2C module
+ *
+ * This function does low level I2C disable.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_disable(struct _i2c_m_async_device *const i2c_dev);
+
+/**
+ * \brief Transfer data by I2C
+ *
+ * This function does low level I2C data transfer.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] msg The pointer to i2c msg structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_transfer(struct _i2c_m_async_device *const i2c_dev, struct _i2c_m_msg *msg);
+
+/**
+ * \brief Set baud rate of I2C
+ *
+ * This function does low level I2C set baud rate.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] clkrate The clock rate(KHz) input to i2c module
+ * \param[in] baudrate The demand baud rate(KHz) of i2c module
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_set_baudrate(struct _i2c_m_async_device *const i2c_dev, uint32_t clkrate, uint32_t baudrate);
+
+/**
+ * \brief Register callback to I2C
+ *
+ * This function does low level I2C callback register.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] cb_type The callback type request
+ * \param[in] func The callback function pointer
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_async_register_callback(struct _i2c_m_async_device *i2c_dev, enum _i2c_m_async_callback_type cb_type,
+                                       FUNC_PTR func);
+
+/**
+ * \brief Generate stop condition on the I2C bus
+ *
+ * This function will generate a stop condition on the I2C bus
+ *
+ * \param[in] i2c_m_async_descriptor An i2c descriptor which is used to communicate through I2C
+ *
+ * \return Operation status
+ * \retval 0 Operation executed successfully
+ * \retval <0 Operation failed
+ */
+int32_t _i2c_m_async_send_stop(struct _i2c_m_async_device *const i2c_dev);
+
+/**
+ * \brief Returns the number of bytes left or not used in the I2C message buffer
+ *
+ * This function will return the number of bytes left (not written to the bus) or still free
+ * (not received from the bus) in the message buffer, depending on direction of transmission.
+ *
+ * \param[in] i2c_m_async_descriptor An i2c descriptor which is used to communicate through I2C
+ *
+ * \return Number of bytes or error code
+ * \retval >0 Positive number indicating bytes left
+ * \retval 0  Buffer is full/empty depending on direction
+ * \retval <0 Error code
+ */
+int32_t _i2c_m_async_get_bytes_left(struct _i2c_m_async_device *const i2c_dev);
+
+/**
+ * \brief Enable/disable I2C master interrupt
+ *
+ * param[in] device The pointer to I2C master device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _i2c_m_async_set_irq_state(struct _i2c_m_async_device *const device, const enum _i2c_m_async_callback_type type,
+                                const bool state);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/sysmoOCTSIM/hal/include/hpl_i2c_m_sync.h b/sysmoOCTSIM/hal/include/hpl_i2c_m_sync.h
new file mode 100644
index 0000000..ce173ae
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_i2c_m_sync.h
@@ -0,0 +1,185 @@
+/**
+ * \file
+ *
+ * \brief I2C Master Hardware Proxy Layer(HPL) declaration.
+ *
+ * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_I2C_M_SYNC_H_INCLUDED
+#define _HPL_I2C_M_SYNC_H_INCLUDED
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief i2c flags
+ */
+#define I2C_M_RD 0x0001 /* read data, from slave to master */
+#define I2C_M_BUSY 0x0100
+#define I2C_M_TEN 0x0400   /* this is a ten bit chip address */
+#define I2C_M_SEVEN 0x0800 /* this is a seven bit chip address */
+#define I2C_M_FAIL 0x1000
+#define I2C_M_STOP 0x8000 /* if I2C_FUNC_PROTOCOL_MANGLING */
+
+/**
+ * \brief i2c Return codes
+ */
+#define I2C_OK 0                     /* Operation successful */
+#define I2C_ACK -1                   /* Received ACK from device on I2C bus */
+#define I2C_NACK -2                  /* Received NACK from device on I2C bus */
+#define I2C_ERR_ARBLOST -3           /* Arbitration lost */
+#define I2C_ERR_BAD_ADDRESS -4       /* Bad address */
+#define I2C_ERR_BUS -5               /* Bus error */
+#define I2C_ERR_BUSY -6              /* Device busy */
+#define I2c_ERR_PACKAGE_COLLISION -7 /* Package collision */
+
+/**
+ * \brief i2c I2C Modes
+ */
+#define I2C_STANDARD_MODE 0x00
+#define I2C_FASTMODE 0x01
+#define I2C_HIGHSPEED_MODE 0x02
+
+/**
+ * \brief i2c master message structure
+ */
+struct _i2c_m_msg {
+	uint16_t          addr;
+	volatile uint16_t flags;
+	int32_t           len;
+	uint8_t *         buffer;
+};
+
+/**
+ * \brief i2c master service
+ */
+struct _i2c_m_service {
+	struct _i2c_m_msg msg;
+	uint16_t          mode;
+	uint16_t          trise;
+};
+
+/**
+ * \brief i2c sync master device structure
+ */
+struct _i2c_m_sync_device {
+	struct _i2c_m_service service;
+	void *                hw;
+};
+
+/**
+ * \name HPL functions
+ */
+
+/**
+ * \brief Initialize I2C
+ *
+ * This function does low level I2C configuration.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_init(struct _i2c_m_sync_device *const i2c_dev, void *const hw);
+
+/**
+ * \brief Deinitialize I2C
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_deinit(struct _i2c_m_sync_device *const i2c_dev);
+
+/**
+ * \brief Enable I2C module
+ *
+ * This function does low level I2C enable.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_enable(struct _i2c_m_sync_device *const i2c_dev);
+
+/**
+ * \brief Disable I2C module
+ *
+ * This function does low level I2C disable.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_disable(struct _i2c_m_sync_device *const i2c_dev);
+
+/**
+ * \brief Transfer data by I2C
+ *
+ * This function does low level I2C data transfer.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] msg The pointer to i2c msg structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_transfer(struct _i2c_m_sync_device *const i2c_dev, struct _i2c_m_msg *msg);
+
+/**
+ * \brief Set baud rate of I2C
+ *
+ * This function does low level I2C set baud rate.
+ *
+ * \param[in] i2c_dev The pointer to i2c device structure
+ * \param[in] clkrate The clock rate(KHz) input to i2c module
+ * \param[in] baudrate The demand baud rate(KHz) of i2c module
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_set_baudrate(struct _i2c_m_sync_device *const i2c_dev, uint32_t clkrate, uint32_t baudrate);
+
+/**
+ * \brief Send send condition on the I2C bus
+ *
+ * This function will generate a stop condition on the I2C bus
+ *
+ * \param[in] i2c_dev The pointer to i2c device struct
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_m_sync_send_stop(struct _i2c_m_sync_device *const i2c_dev);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/sysmoOCTSIM/hal/include/hpl_i2c_s_async.h b/sysmoOCTSIM/hal/include/hpl_i2c_s_async.h
new file mode 100644
index 0000000..92a5765
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_i2c_s_async.h
@@ -0,0 +1,184 @@
+/**
+ * \file
+ *
+ * \brief I2C Slave Hardware Proxy Layer(HPL) declaration.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_I2C_S_ASYNC_H_INCLUDED
+#define _HPL_I2C_S_ASYNC_H_INCLUDED
+
+#include "hpl_i2c_s_sync.h"
+#include "hpl_irq.h"
+#include "utils.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief i2c callback types
+ */
+enum _i2c_s_async_callback_type { I2C_S_DEVICE_ERROR, I2C_S_DEVICE_TX, I2C_S_DEVICE_RX_COMPLETE };
+
+/**
+ * \brief Forward declaration of I2C Slave device
+ */
+struct _i2c_s_async_device;
+
+/**
+ * \brief i2c slave callback function type
+ */
+typedef void (*_i2c_s_async_cb_t)(struct _i2c_s_async_device *device);
+
+/**
+ * \brief i2c slave callback pointers structure
+ */
+struct _i2c_s_async_callback {
+	void (*error)(struct _i2c_s_async_device *const device);
+	void (*tx)(struct _i2c_s_async_device *const device);
+	void (*rx_done)(struct _i2c_s_async_device *const device, const uint8_t data);
+};
+
+/**
+ * \brief i2c slave device structure
+ */
+struct _i2c_s_async_device {
+	void *                       hw;
+	struct _i2c_s_async_callback cb;
+	struct _irq_descriptor       irq;
+};
+
+/**
+ * \name HPL functions
+ */
+
+/**
+ * \brief Initialize asynchronous I2C slave
+ *
+ * This function does low level I2C configuration.
+ *
+ * \param[in] device The pointer to i2c interrupt device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_init(struct _i2c_s_async_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize asynchronous I2C in interrupt mode
+ *
+ * \param[in] device The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_deinit(struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Enable I2C module
+ *
+ * This function does low level I2C enable.
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_enable(struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Disable I2C module
+ *
+ * This function does low level I2C disable.
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_disable(struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Check if 10-bit addressing mode is on
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Cheking status
+ * \retval 1 10-bit addressing mode is on
+ * \retval 0 10-bit addressing mode is off
+ */
+int32_t _i2c_s_async_is_10bit_addressing_on(const struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Set I2C slave address
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ * \param[in] address Address to set
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_set_address(struct _i2c_s_async_device *const device, const uint16_t address);
+
+/**
+ * \brief Write a byte to the given I2C instance
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ * \param[in] data Data to write
+ */
+void _i2c_s_async_write_byte(struct _i2c_s_async_device *const device, const uint8_t data);
+
+/**
+ * \brief Retrieve I2C slave status
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ *\return I2C slave status
+ */
+i2c_s_status_t _i2c_s_async_get_status(const struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Abort data transmission
+ *
+ * \param[in] device The pointer to i2c device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_async_abort_transmission(const struct _i2c_s_async_device *const device);
+
+/**
+ * \brief Enable/disable I2C slave interrupt
+ *
+ * param[in] device The pointer to I2C slave device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] disable Enable or disable
+ */
+int32_t _i2c_s_async_set_irq_state(struct _i2c_s_async_device *const device, const enum _i2c_s_async_callback_type type,
+                                   const bool disable);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HPL_I2C_S_ASYNC_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_i2c_s_sync.h b/sysmoOCTSIM/hal/include/hpl_i2c_s_sync.h
new file mode 100644
index 0000000..93b5934
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_i2c_s_sync.h
@@ -0,0 +1,184 @@
+/**
+ * \file
+ *
+ * \brief I2C Slave Hardware Proxy Layer(HPL) declaration.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+#ifndef _HPL_I2C_S_SYNC_H_INCLUDED
+#define _HPL_I2C_S_SYNC_H_INCLUDED
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief I2C Slave status type
+ */
+typedef uint32_t i2c_s_status_t;
+
+/**
+ * \brief i2c slave device structure
+ */
+struct _i2c_s_sync_device {
+	void *hw;
+};
+
+#include <compiler.h>
+
+/**
+ * \name HPL functions
+ */
+
+/**
+ * \brief Initialize synchronous I2C slave
+ *
+ * This function does low level I2C configuration.
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_init(struct _i2c_s_sync_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize synchronous I2C slave
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_deinit(struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Enable I2C module
+ *
+ * This function does low level I2C enable.
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_enable(struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Disable I2C module
+ *
+ * This function does low level I2C disable.
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_disable(struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Check if 10-bit addressing mode is on
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Cheking status
+ * \retval 1 10-bit addressing mode is on
+ * \retval 0 10-bit addressing mode is off
+ */
+int32_t _i2c_s_sync_is_10bit_addressing_on(const struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Set I2C slave address
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ * \param[in] address Address to set
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_set_address(struct _i2c_s_sync_device *const device, const uint16_t address);
+
+/**
+ * \brief Write a byte to the given I2C instance
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ * \param[in] data Data to write
+ */
+void _i2c_s_sync_write_byte(struct _i2c_s_sync_device *const device, const uint8_t data);
+
+/**
+ * \brief Retrieve I2C slave status
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ *\return I2C slave status
+ */
+i2c_s_status_t _i2c_s_sync_get_status(const struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Clear the Data Ready interrupt flag
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Return 0 for success and negative value for error
+ */
+int32_t _i2c_s_sync_clear_data_ready_flag(const struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Read a byte from the given I2C instance
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Data received via I2C interface.
+ */
+uint8_t _i2c_s_sync_read_byte(const struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Check if I2C is ready to send next byte
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Status of the ready check.
+ * \retval true if the I2C is ready to send next byte
+ * \retval false if the I2C is not ready to send next byte
+ */
+bool _i2c_s_sync_is_byte_sent(const struct _i2c_s_sync_device *const device);
+
+/**
+ * \brief Check if there is data received by I2C
+ *
+ * \param[in] device The pointer to i2c slave device structure
+ *
+ * \return Status of the data received check.
+ * \retval true if the I2C has received a byte
+ * \retval false if the I2C has not received a byte
+ */
+bool _i2c_s_sync_is_byte_received(const struct _i2c_s_sync_device *const device);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _HPL_I2C_S_SYNC_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_spi.h b/sysmoOCTSIM/hal/include/hpl_spi.h
new file mode 100644
index 0000000..a5652e5
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_spi.h
@@ -0,0 +1,163 @@
+/**
+ * \file
+ *
+ * \brief SPI related functionality declaration.
+ *
+ * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_H_INCLUDED
+#define _HPL_SPI_H_INCLUDED
+
+#include <compiler.h>
+#include <utils.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief SPI Dummy char is used when reading data from the SPI slave
+ */
+#define SPI_DUMMY_CHAR 0x1ff
+
+/**
+ *  \brief SPI message to let driver to process
+ */
+//@{
+struct spi_msg {
+	/** Pointer to the output data buffer */
+	uint8_t *txbuf;
+	/** Pointer to the input data buffer */
+	uint8_t *rxbuf;
+	/** Size of the message data in SPI characters */
+	uint32_t size;
+};
+//@}
+
+/**
+ *  \brief SPI transfer modes
+ *  SPI transfer mode controls clock polarity and clock phase.
+ *  Mode 0: leading edge is rising edge, data sample on leading edge.
+ *  Mode 1: leading edge is rising edge, data sample on trailing edge.
+ *  Mode 2: leading edge is falling edge, data sample on leading edge.
+ *  Mode 3: leading edge is falling edge, data sample on trailing edge.
+ */
+enum spi_transfer_mode {
+	/** Leading edge is rising edge, data sample on leading edge. */
+	SPI_MODE_0,
+	/** Leading edge is rising edge, data sample on trailing edge. */
+	SPI_MODE_1,
+	/** Leading edge is falling edge, data sample on leading edge. */
+	SPI_MODE_2,
+	/** Leading edge is falling edge, data sample on trailing edge. */
+	SPI_MODE_3
+};
+
+/**
+ *  \brief SPI character sizes
+ *  The character size influence the way the data is sent/received.
+ *  For char size <= 8 data is stored byte by byte.
+ *  For char size between 9 ~ 16 data is stored in 2-byte length.
+ *  Note that the default and recommended char size is 8 bit since it's
+ *  supported by all system.
+ */
+enum spi_char_size {
+	/** Character size is 8 bit. */
+	SPI_CHAR_SIZE_8 = 0,
+	/** Character size is 9 bit. */
+	SPI_CHAR_SIZE_9 = 1,
+	/** Character size is 10 bit. */
+	SPI_CHAR_SIZE_10 = 2,
+	/** Character size is 11 bit. */
+	SPI_CHAR_SIZE_11 = 3,
+	/** Character size is 12 bit. */
+	SPI_CHAR_SIZE_12 = 4,
+	/** Character size is 13 bit. */
+	SPI_CHAR_SIZE_13 = 5,
+	/** Character size is 14 bit. */
+	SPI_CHAR_SIZE_14 = 6,
+	/** Character size is 15 bit. */
+	SPI_CHAR_SIZE_15 = 7,
+	/** Character size is 16 bit. */
+	SPI_CHAR_SIZE_16 = 8
+};
+
+/**
+ *  \brief SPI data order
+ */
+enum spi_data_order {
+	/** MSB goes first. */
+	SPI_DATA_ORDER_MSB_1ST = 0,
+	/** LSB goes first. */
+	SPI_DATA_ORDER_LSB_1ST = 1
+};
+
+/** \brief Transfer descriptor for SPI
+ *  Transfer descriptor holds TX and RX buffers
+ */
+struct spi_xfer {
+	/** Pointer to data buffer to TX */
+	uint8_t *txbuf;
+	/** Pointer to data buffer to RX */
+	uint8_t *rxbuf;
+	/** Size of data characters to TX & RX */
+	uint32_t size;
+};
+
+/** SPI generic driver. */
+struct spi_dev {
+	/** Pointer to the hardware base or private data for special device. */
+	void *prvt;
+	/** Reference start of sync/async variables */
+	uint32_t sync_async_misc[1];
+};
+
+/**
+ *  \brief Calculate the baudrate value for hardware to use to set baudrate
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] clk Clock frequency (Hz) for baudrate generation.
+ *  \param[in] baud Target baudrate (bps).
+ *  \return Error or baudrate value.
+ *  \retval >0 Baudrate value.
+ *  \retval ERR_INVALID_ARG Calculation fail.
+ */
+int32_t _spi_calc_baud_val(struct spi_dev *dev, const uint32_t clk, const uint32_t baud);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_spi_async.h b/sysmoOCTSIM/hal/include/hpl_spi_async.h
new file mode 100644
index 0000000..8e5a848
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_spi_async.h
@@ -0,0 +1,131 @@
+/**
+ * \file
+ *
+ * \brief Common SPI related functionality declaration.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_ASYNC_H_INCLUDED
+#define _HPL_SPI_ASYNC_H_INCLUDED
+
+#include <hpl_spi.h>
+#include <hpl_irq.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ *  \brief Callbacks the SPI driver must offer in async mode
+ */
+//@{
+/** The callback types */
+enum _spi_async_dev_cb_type {
+	/** Callback type for transmit, see \ref _spi_async_dev_cb_xfer_t. */
+	SPI_DEV_CB_TX,
+	/** Callback type for receive, see \ref _spi_async_dev_cb_xfer_t. */
+	SPI_DEV_CB_RX,
+	/** Callback type for \ref _spi_async_dev_cb_complete_t. */
+	SPI_DEV_CB_COMPLETE,
+	/** Callback type for error */
+	SPI_DEV_CB_ERROR,
+	/** Number of callbacks. */
+	SPI_DEV_CB_N
+};
+
+struct _spi_async_dev;
+
+/** \brief The prototype for callback on SPI transfer error.
+ *  If status code is zero, it indicates the normal completion, that is,
+ *  SS deactivation.
+ *  If status code belows zero, it indicates complete.
+ */
+typedef void (*_spi_async_dev_cb_error_t)(struct _spi_async_dev *dev, int32_t status);
+
+/** \brief The prototype for callback on SPI transmit/receive event
+ *  For TX, the callback is invoked when transmit is done or ready to start
+ *  transmit.
+ *  For RX, the callback is invoked when receive is done or ready to read data,
+ *  see \ref _spi_async_dev_read_one_t on data reading.
+ *  Without DMA enabled, the callback is invoked on each character event.
+ *  With DMA enabled, the callback is invoked on DMA buffer done.
+ */
+typedef void (*_spi_async_dev_cb_xfer_t)(struct _spi_async_dev *dev);
+
+/**
+ *  \brief The callbacks offered by SPI driver
+ */
+struct _spi_async_dev_callbacks {
+	/** TX callback, see \ref _spi_async_dev_cb_xfer_t. */
+	_spi_async_dev_cb_xfer_t tx;
+	/** RX callback, see \ref _spi_async_dev_cb_xfer_t. */
+	_spi_async_dev_cb_xfer_t rx;
+	/** Complete or complete callback, see \ref _spi_async_dev_cb_complete_t. */
+	_spi_async_dev_cb_xfer_t complete;
+	/** Error callback, see \ref */
+	_spi_async_dev_cb_error_t err;
+};
+//@}
+
+/**
+ *  \brief SPI async driver
+ */
+//@{
+
+/** SPI driver to support async HAL */
+struct _spi_async_dev {
+	/** Pointer to the hardware base or private data for special device. */
+	void *prvt;
+	/** Data size, number of bytes for each character */
+	uint8_t char_size;
+	/** Dummy byte used in master mode when reading the slave */
+	uint16_t dummy_byte;
+
+	/** \brief Pointer to callback functions, ignored for polling mode
+	 *  Pointer to the callback functions so that initialize the driver to
+	 *  handle interrupts.
+	 */
+	struct _spi_async_dev_callbacks callbacks;
+	/** IRQ instance for SPI device. */
+	struct _irq_descriptor irq;
+};
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_ASYNC_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_spi_m_async.h b/sysmoOCTSIM/hal/include/hpl_spi_m_async.h
new file mode 100644
index 0000000..69dd435
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_spi_m_async.h
@@ -0,0 +1,238 @@
+/**
+ * \file
+ *
+ * \brief SPI Slave Async related functionality declaration.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_M_ASYNC_H_INCLUDED
+#define _HPL_SPI_M_ASYNC_H_INCLUDED
+
+#include <hpl_spi.h>
+#include <hpl_spi_async.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Uses common SPI async device driver. */
+#define _spi_m_async_dev _spi_async_dev
+
+#define _spi_m_async_dev_cb_type _spi_async_dev_cb_type
+
+/** Uses common SPI async device driver complete callback type. */
+#define _spi_m_async_dev_cb_error_t _spi_async_dev_cb_error_t
+
+/** Uses common SPI async device driver transfer callback type. */
+#define _spi_m_async_dev_cb_xfer_t _spi_async_dev_cb_xfer_t
+
+/**
+ *  \brief Initialize SPI for access with interrupts
+ *  It will load default hardware configuration and software struct.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] hw Pointer to the hardware base.
+ *  \retval ERR_INVALID_ARG Input parameter problem.
+ *  \retval ERR_BUSY SPI hardware not ready (resetting).
+ *  \retval ERR_DENIED SPI has been enabled.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_init(struct _spi_m_async_dev *dev, void *const hw);
+
+/**
+ *  \brief Initialize SPI for access with interrupts
+ *  Disable, reset the hardware and the software struct.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_deinit(struct _spi_m_async_dev *dev);
+
+/**
+ *  \brief Enable SPI for access with interrupts
+ *  Enable the SPI and enable callback generation of receive and error
+ *  interrupts.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG Input parameter problem.
+ *  \retval ERR_BUSY SPI hardware not ready (resetting).
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_enable(struct _spi_m_async_dev *dev);
+
+/**
+ *  \brief Disable SPI for access without interrupts
+ *  Disable SPI and interrupts. Deactivate all CS pins if works as master.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_disable(struct _spi_m_async_dev *dev);
+
+/**
+ *  \brief Set SPI transfer mode
+ *  Set SPI transfer mode (\ref spi_transfer_mode),
+ *  which controls clock polarity and clock phase.
+ *  Mode 0: leading edge is rising edge, data sample on leading edge.
+ *  Mode 1: leading edge is rising edge, data sample on trailing edge.
+ *  Mode 2: leading edge is falling edge, data sample on leading edge.
+ *  Mode 3: leading edge is falling edge, data sample on trailing edge.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] mode The SPI transfer mode.
+ *  \return Operation status.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_set_mode(struct _spi_m_async_dev *dev, const enum spi_transfer_mode mode);
+
+/**
+ *  \brief Set SPI baudrate
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] baud_val The SPI baudrate value, see \ref _spi_calc_baud_val() on
+ *                  how it's generated.
+ *  \return Operation status.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_set_baudrate(struct _spi_m_async_dev *dev, const uint32_t baud_val);
+
+/**
+ *  \brief Set SPI baudrate
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] char_size The character size, see \ref spi_char_size.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG The character size is not supported.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_set_char_size(struct _spi_m_async_dev *dev, const enum spi_char_size char_size);
+
+/**
+ *  \brief Set SPI data order
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] dord SPI data order (LSB/MSB first).
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG The character size is not supported.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_async_set_data_order(struct _spi_m_async_dev *dev, const enum spi_data_order dord);
+
+/**
+ * \brief Enable interrupt on character output
+ *
+ * Enable interrupt when a new character can be written
+ * to the SPI device.
+ *
+ * \param[in] dev   Pointer to the SPI device instance
+ * \param[in] state true  = enable output interrupt
+ *                  false = disable output interrupt
+ *
+ * \return Status code
+ * \retval 0 Ok status
+ */
+int32_t _spi_m_async_enable_tx(struct _spi_m_async_dev *dev, bool state);
+
+/**
+ * \brief Enable interrupt on character input
+ *
+ * Enable interrupt when a new character is ready to be
+ * read from the SPI device.
+ *
+ * \param[in] dev  Pointer to the SPI device instance
+ * \param[in] state true  = enable input interrupts
+ *                  false = disable input interrupt
+ *
+ * \return Status code
+ * \retvat 0 OK Status
+ */
+int32_t _spi_m_async_enable_rx(struct _spi_m_async_dev *dev, bool state);
+
+/**
+ * \brief Enable interrupt on after data transmission complate
+ *
+ * \param[in] dev  Pointer to the SPI device instance
+ * \param[in] state true  = enable input interrupts
+ *                  false = disable input interrupt
+ *
+ * \return Status code
+ * \retvat 0 OK Status
+ */
+int32_t _spi_m_async_enable_tx_complete(struct _spi_m_async_dev *dev, bool state);
+
+/**
+ *  \brief Read one character to SPI device instance
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *
+ *  \return Character read from SPI module
+ */
+uint16_t _spi_m_async_read_one(struct _spi_m_async_dev *dev);
+
+/**
+ *  \brief Write one character to assigned buffer
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] data
+ *
+ *  \return Status code of write operation
+ *  \retval 0 Write operation OK
+ */
+int32_t _spi_m_async_write_one(struct _spi_m_async_dev *dev, uint16_t data);
+
+/**
+ *  \brief Register the SPI device callback
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] cb_type The callback type.
+ *  \param[in] func The callback function to register. NULL to disable callback.
+ *  \return Always 0.
+ */
+int32_t _spi_m_async_register_callback(struct _spi_m_async_dev *dev, const enum _spi_m_async_dev_cb_type cb_type,
+                                       const FUNC_PTR func);
+
+/**
+ * \brief Enable/disable SPI master interrupt
+ *
+ * param[in] device The pointer to SPI master device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _spi_m_async_set_irq_state(struct _spi_m_async_dev *const device, const enum _spi_m_async_dev_cb_type type,
+                                const bool state);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_M_ASYNC_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_spi_m_dma.h b/sysmoOCTSIM/hal/include/hpl_spi_m_dma.h
new file mode 100644
index 0000000..f481fb8
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_spi_m_dma.h
@@ -0,0 +1,177 @@
+/**
+ * \file
+ *
+ * \brief SPI Master DMA related functionality declaration.
+ *
+ * Copyright (c) 2016-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_M_DMA_H_INCLUDED
+#define _HPL_SPI_M_DMA_H_INCLUDED
+
+#include <hpl_spi.h>
+#include <hpl_spi_dma.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Uses common SPI dma device driver. */
+#define _spi_m_dma_dev _spi_dma_dev
+
+#define _spi_m_dma_dev_cb_type _spi_dma_dev_cb_type
+
+/**
+ *  \brief Initialize SPI for access with interrupts
+ *  It will load default hardware configuration and software struct.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] hw Pointer to the hardware base.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG Input parameter problem.
+ *  \retval ERR_BUSY SPI hardware not ready (resetting).
+ *  \retval ERR_DENIED SPI has been enabled.
+ *  \retval 0 ERR_NONE is operation done successfully.
+ */
+int32_t _spi_m_dma_init(struct _spi_m_dma_dev *dev, void *const hw);
+
+/**
+ *  \brief Initialize SPI for access with interrupts
+ *  Disable, reset the hardware and the software struct.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval 0 ERR_NONE is operation done successfully.
+ */
+int32_t _spi_m_dma_deinit(struct _spi_m_dma_dev *dev);
+
+/**
+ *  \brief Enable SPI for access with interrupts
+ *  Enable the SPI and enable callback generation of receive and error
+ *  interrupts.
+ *  \param[in] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG Input parameter problem.
+ *  \retval ERR_BUSY SPI hardware not ready (resetting).
+ *  \retval 0 ERR_NONE is operation done successfully.
+ */
+int32_t _spi_m_dma_enable(struct _spi_m_dma_dev *dev);
+
+/**
+ *  \brief Disable SPI for access without interrupts
+ *  Disable SPI and interrupts. Deactivate all CS pins if works as master.
+ *  \param[in] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval 0 ERR_NONE is operation done successfully.
+ */
+int32_t _spi_m_dma_disable(struct _spi_m_dma_dev *dev);
+
+/**
+ *  \brief Set SPI transfer mode
+ *  Set SPI transfer mode (\ref spi_transfer_mode),
+ *  which controls clock polarity and clock phase.
+ *  Mode 0: leading edge is rising edge, data sample on leading edge.
+ *  Mode 1: leading edge is rising edge, data sample on trailing edge.
+ *  Mode 2: leading edge is falling edge, data sample on leading edge.
+ *  Mode 3: leading edge is falling edge, data sample on trailing edge.
+ *  \param[in] dev Pointer to the SPI device instance.
+ *  \param[in] mode The SPI transfer mode.
+ *  \return Operation status.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 ERR_NONE is operation done successfully.
+ */
+int32_t _spi_m_dma_set_mode(struct _spi_m_dma_dev *dev, const enum spi_transfer_mode mode);
+
+/**
+ *  \brief Set SPI baudrate
+ *  \param[in] dev Pointer to the SPI device instance.
+ *  \param[in] baud_val The SPI baudrate value, see \ref _spi_calc_baud_val() on
+ *                  how it's generated.
+ *  \return Operation status.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_dma_set_baudrate(struct _spi_m_dma_dev *dev, const uint32_t baud_val);
+
+/**
+ *  \brief Set SPI baudrate
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] char_size The character size, see \ref spi_char_size.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG The character size is not supported.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_dma_set_char_size(struct _spi_m_dma_dev *dev, const enum spi_char_size char_size);
+
+/**
+ *  \brief Set SPI data order
+ *  \param[in] dev Pointer to the SPI device instance.
+ *  \param[in] dord SPI data order (LSB/MSB first).
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG The character size is not supported.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_dma_set_data_order(struct _spi_m_dma_dev *dev, const enum spi_data_order dord);
+
+/**
+ *  \brief Register the SPI device callback
+ *  \param[in] dev Pointer to the SPI device instance.
+ *  \param[in] cb_type The callback type.
+ *  \param[in] func The callback function to register. NULL to disable callback.
+ *  \return Always 0.
+ */
+void _spi_m_dma_register_callback(struct _spi_m_dma_dev *dev, enum _spi_dma_dev_cb_type, _spi_dma_cb_t func);
+
+/** \brief Do SPI data transfer (TX & RX) with DMA
+ *  Log the TX & RX buffers and transfer them in background. It never blocks.
+ *
+ *  \param[in] dev Pointer to the SPI device instance.
+ *  \param[in] txbuf Pointer to the transfer information (\ref spi_transfer).
+ *  \param[out] rxbuf Pointer to the receiver information (\ref spi_receive).
+ *  \param[in] length spi transfer data length.
+ *
+ *  \return Operation status.
+ *  \retval ERR_NONE Success.
+ *  \retval ERR_BUSY Busy.
+ */
+int32_t _spi_m_dma_transfer(struct _spi_m_dma_dev *dev, uint8_t const *txbuf, uint8_t *const rxbuf,
+                            const uint16_t length);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_M_DMA_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_spi_m_sync.h b/sysmoOCTSIM/hal/include/hpl_spi_m_sync.h
new file mode 100644
index 0000000..01e8fc3
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_spi_m_sync.h
@@ -0,0 +1,161 @@
+/**
+ * \file
+ *
+ * \brief SPI related functionality declaration.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_M_SYNC_H_INCLUDED
+#define _HPL_SPI_M_SYNC_H_INCLUDED
+
+#include <hpl_spi.h>
+#include <hpl_spi_sync.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Uses common SPI async device driver. */
+#define _spi_m_sync_dev _spi_sync_dev
+
+/**
+ *  \brief Initialize SPI for access without interrupts
+ *  It will load default hardware configuration and software struct.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] hw Pointer to the hardware base.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG Input parameter problem.
+ *  \retval ERR_BUSY SPI hardware not ready (resetting).
+ *  \retval ERR_DENIED SPI has been enabled.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_init(struct _spi_m_sync_dev *dev, void *const hw);
+
+/**
+ *  \brief Deinitialize SPI
+ *  Disable, reset the hardware and the software struct.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_deinit(struct _spi_m_sync_dev *dev);
+
+/**
+ *  \brief Enable SPI for access without interrupts
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval ERR_BUSY SPI hardware not ready (resetting).
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_enable(struct _spi_m_sync_dev *dev);
+
+/**
+ *  \brief Disable SPI for access without interrupts
+ *  Disable SPI. Deactivate all CS pins if works as master.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_disable(struct _spi_m_sync_dev *dev);
+
+/**
+ *  \brief Set SPI transfer mode
+ *  Set SPI transfer mode (\ref spi_transfer_mode),
+ *  which controls clock polarity and clock phase.
+ *  Mode 0: leading edge is rising edge, data sample on leading edge.
+ *  Mode 1: leading edge is rising edge, data sample on trailing edge.
+ *  Mode 2: leading edge is falling edge, data sample on leading edge.
+ *  Mode 3: leading edge is falling edge, data sample on trailing edge.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] mode The SPI transfer mode.
+ *  \return Operation status.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_set_mode(struct _spi_m_sync_dev *dev, const enum spi_transfer_mode mode);
+
+/**
+ *  \brief Set SPI baudrate
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] baud_val The SPI baudrate value, see \ref _spi_calc_baud_val() on
+ *                  how it's generated.
+ *  \return Operation status.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_set_baudrate(struct _spi_m_sync_dev *dev, const uint32_t baud_val);
+
+/**
+ *  \brief Set SPI baudrate
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] char_size The character size, see \ref spi_char_size.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG The character size is not supported.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_set_char_size(struct _spi_m_sync_dev *dev, const enum spi_char_size char_size);
+
+/**
+ *  \brief Set SPI data order
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] dord SPI data order (LSB/MSB first).
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG The character size is not supported.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_m_sync_set_data_order(struct _spi_m_sync_dev *dev, const enum spi_data_order dord);
+
+/**
+ *  \brief Transfer the whole message without interrupt
+ *  Transfer the message, it will keep waiting until the message finish or
+ *  error.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] msg Pointer to the message instance to process.
+ *  \return Error or number of characters transferred.
+ *  \retval ERR_BUSY SPI hardware is not ready to start transfer (not
+ *                   enabled, busy applying settings, ...).
+ *  \retval SPI_ERR_OVERFLOW Overflow error.
+ *  \retval >=0 Number of characters transferred.
+ */
+int32_t _spi_m_sync_trans(struct _spi_m_sync_dev *dev, const struct spi_msg *msg);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_M_SYNC_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_spi_s_async.h b/sysmoOCTSIM/hal/include/hpl_spi_s_async.h
new file mode 100644
index 0000000..2892e2c
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_spi_s_async.h
@@ -0,0 +1,227 @@
+/**
+ * \file
+ *
+ * \brief SPI Slave Async related functionality declaration.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_S_ASYNC_H_INCLUDED
+#define _HPL_SPI_S_ASYNC_H_INCLUDED
+
+#include <hpl_spi_async.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Uses common SPI async device driver. */
+#define _spi_s_async_dev _spi_async_dev
+
+#define _spi_s_async_dev_cb_type _spi_async_dev_cb_type
+
+/** Uses common SPI async device driver complete callback type. */
+#define _spi_m_async_dev_cb_error_t _spi_async_dev_cb_error_t
+
+/** Uses common SPI async device driver transfer callback type. */
+#define _spi_s_async_dev_cb_xfer_t _spi_async_dev_cb_xfer_t
+
+/**
+ *  \brief Initialize SPI for access with interrupts
+ *  It will load default hardware configuration and software struct.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] hw Pointer to the hardware base.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG Input parameter problem.
+ *  \retval ERR_BUSY SPI hardware not ready (resetting).
+ *  \retval ERR_DENIED SPI has been enabled.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_init(struct _spi_s_async_dev *dev, void *const hw);
+
+/**
+ *  \brief Initialize SPI for access with interrupts
+ *  Disable, reset the hardware and the software struct.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_deinit(struct _spi_s_async_dev *dev);
+
+/**
+ *  \brief Enable SPI for access with interrupts
+ *  Enable the SPI and enable callback generation of receive and error
+ *  interrupts.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG Input parameter problem.
+ *  \retval ERR_BUSY SPI hardware not ready (resetting).
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_enable(struct _spi_s_async_dev *dev);
+
+/**
+ *  \brief Disable SPI for access without interrupts
+ *  Disable SPI and interrupts. Deactivate all CS pins if works as master.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_disable(struct _spi_s_async_dev *dev);
+
+/**
+ *  \brief Set SPI transfer mode
+ *  Set SPI transfer mode (\ref spi_transfer_mode),
+ *  which controls clock polarity and clock phase.
+ *  Mode 0: leading edge is rising edge, data sample on leading edge.
+ *  Mode 1: leading edge is rising edge, data sample on trailing edge.
+ *  Mode 2: leading edge is falling edge, data sample on leading edge.
+ *  Mode 3: leading edge is falling edge, data sample on trailing edge.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] mode The SPI transfer mode.
+ *  \return Operation status.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_set_mode(struct _spi_s_async_dev *dev, const enum spi_transfer_mode mode);
+
+/**
+ *  \brief Set SPI baudrate
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] char_size The character size, see \ref spi_char_size.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG The character size is not supported.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_set_char_size(struct _spi_s_async_dev *dev, const enum spi_char_size char_size);
+
+/**
+ *  \brief Set SPI data order
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] dord SPI data order (LSB/MSB first).
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG The character size is not supported.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_async_set_data_order(struct _spi_s_async_dev *dev, const enum spi_data_order dord);
+
+/**
+ * \brief Enable interrupt on character output
+ *
+ * Enable interrupt when a new character can be written
+ * to the SPI device.
+ *
+ * \param[in] dev   Pointer to the SPI device instance
+ * \param[in] state true  = enable output interrupt
+ *                  false = disable output interrupt
+ *
+ * \return Status code
+ * \retval 0 Ok status
+ */
+int32_t _spi_s_async_enable_tx(struct _spi_s_async_dev *dev, bool state);
+
+/**
+ * \brief Enable interrupt on character input
+ *
+ * Enable interrupt when a new character is ready to be
+ * read from the SPI device.
+ *
+ * \param[in] dev  Pointer to the SPI device instance
+ * \param[in] state true  = enable input interrupts
+ *                  false = disable input interrupt
+ *
+ * \return Status code
+ * \retvat 0 OK Status
+ */
+int32_t _spi_s_async_enable_rx(struct _spi_s_async_dev *dev, bool state);
+
+/**
+ * \brief Enable interrupt on Slave Select (SS) rising
+ *
+ * \param[in] dev  Pointer to the SPI device instance
+ * \param[in] state true  = enable input interrupts
+ *                  false = disable input interrupt
+ *
+ * \return Status code
+ * \retvat 0 OK Status
+ */
+int32_t _spi_s_async_enable_ss_detect(struct _spi_s_async_dev *dev, bool state);
+
+/**
+ *  \brief Read one character to SPI device instance
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *
+ *  \return Character read from SPI module
+ */
+uint16_t _spi_s_async_read_one(struct _spi_s_async_dev *dev);
+
+/**
+ *  \brief Write one character to assigned buffer
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] data
+ *
+ *  \return Status code of write operation
+ *  \retval 0 Write operation OK
+ */
+int32_t _spi_s_async_write_one(struct _spi_s_async_dev *dev, uint16_t data);
+
+/**
+ *  \brief Register the SPI device callback
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] cb_type The callback type.
+ *  \param[in] func The callback function to register. NULL to disable callback.
+ *  \return Always 0.
+ */
+int32_t _spi_s_async_register_callback(struct _spi_s_async_dev *dev, const enum _spi_s_async_dev_cb_type cb_type,
+                                       const FUNC_PTR func);
+
+/**
+ * \brief Enable/disable SPI slave interrupt
+ *
+ * param[in] device The pointer to SPI slave device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _spi_s_async_set_irq_state(struct _spi_s_async_dev *const device, const enum _spi_async_dev_cb_type type,
+                                const bool state);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_S_ASYNC_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_spi_s_sync.h b/sysmoOCTSIM/hal/include/hpl_spi_s_sync.h
new file mode 100644
index 0000000..4fda095
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_spi_s_sync.h
@@ -0,0 +1,227 @@
+/**
+ * \file
+ *
+ * \brief SPI related functionality declaration.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_S_SYNC_H_INCLUDED
+#define _HPL_SPI_S_SYNC_H_INCLUDED
+
+#include <hpl_spi_sync.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Uses common SPI async device driver. */
+#define _spi_s_sync_dev _spi_sync_dev
+
+/**
+ *  \brief Initialize SPI for access without interrupts
+ *  It will load default hardware configuration and software struct.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] hw Pointer to the hardware base.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG Input parameter problem.
+ *  \retval ERR_BUSY SPI hardware not ready (resetting).
+ *  \retval ERR_DENIED SPI has been enabled.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_init(struct _spi_s_sync_dev *dev, void *const hw);
+
+/**
+ *  \brief Initialize SPI for access with interrupts
+ *  Disable, reset the hardware and the software struct.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_deinit(struct _spi_s_sync_dev *dev);
+
+/**
+ *  \brief Enable SPI for access without interrupts
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval ERR_BUSY SPI hardware not ready (resetting).
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_enable(struct _spi_s_sync_dev *dev);
+
+/**
+ *  \brief Disable SPI for access without interrupts
+ *  Disable SPI. Deactivate all CS pins if works as master.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \return Operation status.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_disable(struct _spi_s_sync_dev *dev);
+
+/**
+ *  \brief Set SPI transfer mode
+ *  Set SPI transfer mode (\ref spi_transfer_mode),
+ *  which controls clock polarity and clock phase.
+ *  Mode 0: leading edge is rising edge, data sample on leading edge.
+ *  Mode 1: leading edge is rising edge, data sample on trailing edge.
+ *  Mode 2: leading edge is falling edge, data sample on leading edge.
+ *  Mode 3: leading edge is falling edge, data sample on trailing edge.
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] mode The SPI transfer mode.
+ *  \return Operation status.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_set_mode(struct _spi_s_sync_dev *dev, const enum spi_transfer_mode mode);
+
+/**
+ *  \brief Set SPI baudrate
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] char_size The character size, see \ref spi_char_size.
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG The character size is not supported.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_set_char_size(struct _spi_s_sync_dev *dev, const enum spi_char_size char_size);
+
+/**
+ *  \brief Set SPI data order
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] dord SPI data order (LSB/MSB first).
+ *  \return Operation status.
+ *  \retval ERR_INVALID_ARG The character size is not supported.
+ *  \retval ERR_BUSY SPI is not ready to accept new setting.
+ *  \retval 0 Operation done successfully.
+ */
+int32_t _spi_s_sync_set_data_order(struct _spi_s_sync_dev *dev, const enum spi_data_order dord);
+
+/**
+ * \brief Enable interrupt on character output
+ *
+ * Enable interrupt when a new character can be written
+ * to the SPI device.
+ *
+ * \param[in] dev   Pointer to the SPI device instance
+ * \param[in] state true  = enable output interrupt
+ *                  false = disable output interrupt
+ *
+ * \return Status code
+ * \retval 0 Ok status
+ */
+int32_t _spi_s_sync_enable_tx(struct _spi_s_sync_dev *dev, bool state);
+
+/**
+ * \brief Enable interrupt on character input
+ *
+ * Enable interrupt when a new character is ready to be
+ * read from the SPI device.
+ *
+ * \param[in] dev  Pointer to the SPI device instance
+ * \param[in] state true  = enable input interrupts
+ *                  false = disable input interrupt
+ *
+ * \return Status code
+ * \retval 0 OK Status
+ */
+int32_t _spi_s_sync_enable_rx(struct _spi_s_sync_dev *dev, bool state);
+
+/**
+ *  \brief Read one character to SPI device instance
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *
+ *  \return Character read from SPI module
+ */
+uint16_t _spi_s_sync_read_one(struct _spi_s_sync_dev *dev);
+
+/**
+ *  \brief Write one character to assigned buffer
+ *  \param[in, out] dev Pointer to the SPI device instance.
+ *  \param[in] data
+ *
+ *  \return Status code of write operation
+ *  \retval 0 Write operation OK
+ */
+int32_t _spi_s_sync_write_one(struct _spi_s_sync_dev *dev, uint16_t data);
+
+/**
+ * \brief Check if TX ready
+ *
+ * \param[in] dev  Pointer to the SPI device instance
+ *
+ * \return TX ready state
+ * \retval true TX ready
+ * \retval false TX not ready
+ */
+bool _spi_s_sync_is_tx_ready(struct _spi_s_sync_dev *dev);
+
+/**
+ * \brief Check if RX character ready
+ *
+ * \param[in] dev  Pointer to the SPI device instance
+ *
+ * \return RX character ready state
+ * \retval true RX character ready
+ * \retval false RX character not ready
+ */
+bool _spi_s_sync_is_rx_ready(struct _spi_s_sync_dev *dev);
+
+/**
+ * \brief Check if SS deactiviation detected
+ *
+ * \param[in] dev  Pointer to the SPI device instance
+ *
+ * \return SS deactiviation state
+ * \retval true SS deactiviation detected
+ * \retval false SS deactiviation not detected
+ */
+bool _spi_s_sync_is_ss_deactivated(struct _spi_s_sync_dev *dev);
+
+/**
+ * \brief Check if error is detected
+ *
+ * \param[in] dev  Pointer to the SPI device instance
+ *
+ * \return Error detection state
+ * \retval true Error detected
+ * \retval false Error not detected
+ */
+bool _spi_s_sync_is_error(struct _spi_s_sync_dev *dev);
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_S_SYNC_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_spi_sync.h b/sysmoOCTSIM/hal/include/hpl_spi_sync.h
new file mode 100644
index 0000000..dc88648
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_spi_sync.h
@@ -0,0 +1,70 @@
+/**
+ * \file
+ *
+ * \brief Common SPI related functionality declaration.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SPI_SYNC_H_INCLUDED
+#define _HPL_SPI_SYNC_H_INCLUDED
+
+#include <compiler.h>
+#include <utils.h>
+
+#include <hpl_spi.h>
+
+/**
+ * \addtogroup hpl_spi HPL SPI
+ *
+ * \section hpl_spi_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** SPI driver to support sync HAL */
+struct _spi_sync_dev {
+	/** Pointer to the hardware base or private data for special device. */
+	void *prvt;
+	/** Data size, number of bytes for each character */
+	uint8_t char_size;
+	/** Dummy byte used in master mode when reading the slave */
+	uint16_t dummy_byte;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+/**@}*/
+#endif /* ifndef _HPL_SPI_SYNC_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_usart.h b/sysmoOCTSIM/hal/include/hpl_usart.h
new file mode 100644
index 0000000..0e09501
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_usart.h
@@ -0,0 +1,113 @@
+/**
+ * \file
+ *
+ * \brief USART related functionality declaration.
+ *
+ * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_USART_H_INCLUDED
+#define _HPL_USART_H_INCLUDED
+
+/**
+ * \addtogroup HPL USART SYNC
+ *
+ * \section hpl_usart_sync_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <compiler.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief USART flow control state
+ */
+union usart_flow_control_state {
+	struct {
+		uint8_t cts : 1;
+		uint8_t rts : 1;
+		uint8_t unavailable : 1;
+		uint8_t reserved : 5;
+	} bit;
+	uint8_t value;
+};
+
+/**
+ * \brief USART baud rate mode
+ */
+enum usart_baud_rate_mode { USART_BAUDRATE_ASYNCH_ARITHMETIC, USART_BAUDRATE_ASYNCH_FRACTIONAL, USART_BAUDRATE_SYNCH };
+
+/**
+ * \brief USART data order
+ */
+enum usart_data_order { USART_DATA_ORDER_MSB = 0, USART_DATA_ORDER_LSB = 1 };
+
+/**
+ * \brief USART mode
+ */
+enum usart_mode { USART_MODE_ASYNCHRONOUS = 0, USART_MODE_SYNCHRONOUS = 1 };
+
+/**
+ * \brief USART parity
+ */
+enum usart_parity {
+	USART_PARITY_EVEN  = 0,
+	USART_PARITY_ODD   = 1,
+	USART_PARITY_NONE  = 2,
+	USART_PARITY_SPACE = 3,
+	USART_PARITY_MARK  = 4
+};
+
+/**
+ * \brief USART stop bits mode
+ */
+enum usart_stop_bits { USART_STOP_BITS_ONE = 0, USART_STOP_BITS_TWO = 1, USART_STOP_BITS_ONE_P_FIVE = 2 };
+
+/**
+ * \brief USART character size
+ */
+enum usart_character_size {
+	USART_CHARACTER_SIZE_8BITS = 0,
+	USART_CHARACTER_SIZE_9BITS = 1,
+	USART_CHARACTER_SIZE_5BITS = 5,
+	USART_CHARACTER_SIZE_6BITS = 6,
+	USART_CHARACTER_SIZE_7BITS = 7
+};
+
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_USART_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_usart_async.h b/sysmoOCTSIM/hal/include/hpl_usart_async.h
new file mode 100644
index 0000000..3f833d1
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_usart_async.h
@@ -0,0 +1,270 @@
+/**
+ * \file
+ *
+ * \brief USART related functionality declaration.
+ *
+ * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_USART_ASYNC_H_INCLUDED
+#define _HPL_USART_ASYNC_H_INCLUDED
+
+/**
+ * \addtogroup HPL USART
+ *
+ * \section hpl_usart_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include "hpl_usart.h"
+#include "hpl_irq.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief USART callback types
+ */
+enum _usart_async_callback_type { USART_ASYNC_BYTE_SENT, USART_ASYNC_RX_DONE, USART_ASYNC_TX_DONE, USART_ASYNC_ERROR };
+
+/**
+ * \brief USART device structure
+ *
+ * The USART device structure forward declaration.
+ */
+struct _usart_async_device;
+
+/**
+ * \brief USART interrupt callbacks
+ */
+struct _usart_async_callbacks {
+	void (*tx_byte_sent)(struct _usart_async_device *device);
+	void (*rx_done_cb)(struct _usart_async_device *device, uint8_t data);
+	void (*tx_done_cb)(struct _usart_async_device *device);
+	void (*error_cb)(struct _usart_async_device *device);
+};
+
+/**
+ * \brief USART descriptor device structure
+ */
+struct _usart_async_device {
+	struct _usart_async_callbacks usart_cb;
+	struct _irq_descriptor        irq;
+	void *                        hw;
+};
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Initialize asynchronous USART
+ *
+ * This function does low level USART configuration.
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status
+ */
+int32_t _usart_async_init(struct _usart_async_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize USART
+ *
+ * This function closes the given USART by disabling its clock.
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_async_deinit(struct _usart_async_device *const device);
+
+/**
+ * \brief Enable usart module
+ *
+ * This function will enable the usart module
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_async_enable(struct _usart_async_device *const device);
+
+/**
+ * \brief Disable usart module
+ *
+ * This function will disable the usart module
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_async_disable(struct _usart_async_device *const device);
+
+/**
+ * \brief Calculate baud rate register value
+ *
+ * \param[in] baud Required baud rate
+ * \param[in] clock_rate clock frequency
+ * \param[in] samples The number of samples
+ * \param[in] mode USART mode
+ * \param[in] fraction A fraction value
+ *
+ * \return Calculated baud rate register value
+ */
+uint16_t _usart_async_calculate_baud_rate(const uint32_t baud, const uint32_t clock_rate, const uint8_t samples,
+                                          const enum usart_baud_rate_mode mode, const uint8_t fraction);
+
+/**
+ * \brief Set baud rate
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] baud_rate A baud rate to set
+ */
+void _usart_async_set_baud_rate(struct _usart_async_device *const device, const uint32_t baud_rate);
+
+/**
+ * \brief Set data order
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] order A data order to set
+ */
+void _usart_async_set_data_order(struct _usart_async_device *const device, const enum usart_data_order order);
+
+/**
+ * \brief Set mode
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] mode A mode to set
+ */
+void _usart_async_set_mode(struct _usart_async_device *const device, const enum usart_mode mode);
+
+/**
+ * \brief Set parity
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] parity A parity to set
+ */
+void _usart_async_set_parity(struct _usart_async_device *const device, const enum usart_parity parity);
+
+/**
+ * \brief Set stop bits mode
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] stop_bits A stop bits mode to set
+ */
+void _usart_async_set_stop_bits(struct _usart_async_device *const device, const enum usart_stop_bits stop_bits);
+
+/**
+ * \brief Set character size
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] size A character size to set
+ */
+void _usart_async_set_character_size(struct _usart_async_device *const device, const enum usart_character_size size);
+
+/**
+ * \brief Retrieve usart status
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+uint32_t _usart_async_get_status(const struct _usart_async_device *const device);
+
+/**
+ * \brief Write a byte to the given USART instance
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] data Data to write
+ */
+void _usart_async_write_byte(struct _usart_async_device *const device, uint8_t data);
+
+/**
+ * \brief Check if USART is ready to send next byte
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return Status of the ready check.
+ * \retval true if the USART is ready to send next byte
+ * \retval false if the USART is not ready to send next byte
+ */
+bool _usart_async_is_byte_sent(const struct _usart_async_device *const device);
+
+/**
+ * \brief Set the state of flow control pins
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] state - A state of flow control pins to set
+ */
+void _usart_async_set_flow_control_state(struct _usart_async_device *const    device,
+                                         const union usart_flow_control_state state);
+
+/**
+ * \brief Retrieve the state of flow control pins
+ *
+ * This function retrieves the of flow control pins.
+ *
+ * \return USART_FLOW_CONTROL_STATE_UNAVAILABLE.
+ */
+union usart_flow_control_state _usart_async_get_flow_control_state(const struct _usart_async_device *const device);
+
+/**
+ * \brief Enable data register empty interrupt
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_async_enable_byte_sent_irq(struct _usart_async_device *const device);
+
+/**
+ * \brief Enable transmission complete interrupt
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_async_enable_tx_done_irq(struct _usart_async_device *const device);
+
+/**
+ * \brief Retrieve ordinal number of the given USART hardware instance
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return The ordinal number of the given USART hardware instance
+ */
+uint8_t _usart_async_get_hardware_index(const struct _usart_async_device *const device);
+
+/**
+ * \brief Enable/disable USART interrupt
+ *
+ * param[in] device The pointer to USART device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _usart_async_set_irq_state(struct _usart_async_device *const device, const enum _usart_async_callback_type type,
+                                const bool state);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_USART_ASYNC_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/include/hpl_usart_sync.h b/sysmoOCTSIM/hal/include/hpl_usart_sync.h
new file mode 100644
index 0000000..abc7264
--- /dev/null
+++ b/sysmoOCTSIM/hal/include/hpl_usart_sync.h
@@ -0,0 +1,254 @@
+/**
+ * \file
+ *
+ * \brief USART related functionality declaration.
+ *
+ * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#ifndef _HPL_SYNC_USART_H_INCLUDED
+#define _HPL_SYNC_USART_H_INCLUDED
+
+/**
+ * \addtogroup HPL USART SYNC
+ *
+ * \section hpl_usart_sync_rev Revision History
+ * - v1.0.0 Initial Release
+ *
+ *@{
+ */
+
+#include <hpl_usart.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief USART descriptor device structure
+ */
+struct _usart_sync_device {
+	void *hw;
+};
+
+/**
+ * \name HPL functions
+ */
+//@{
+/**
+ * \brief Initialize synchronous USART
+ *
+ * This function does low level USART configuration.
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return Initialization status
+ */
+int32_t _usart_sync_init(struct _usart_sync_device *const device, void *const hw);
+
+/**
+ * \brief Deinitialize USART
+ *
+ * This function closes the given USART by disabling its clock.
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_sync_deinit(struct _usart_sync_device *const device);
+
+/**
+ * \brief Enable usart module
+ *
+ * This function will enable the usart module
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_sync_enable(struct _usart_sync_device *const device);
+
+/**
+ * \brief Disable usart module
+ *
+ * This function will disable the usart module
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+void _usart_sync_disable(struct _usart_sync_device *const device);
+
+/**
+ * \brief Calculate baud rate register value
+ *
+ * \param[in] baud Required baud rate
+ * \param[in] clock_rate clock frequency
+ * \param[in] samples The number of samples
+ * \param[in] mode USART mode
+ * \param[in] fraction A fraction value
+ *
+ * \return Calculated baud rate register value
+ */
+uint16_t _usart_sync_calculate_baud_rate(const uint32_t baud, const uint32_t clock_rate, const uint8_t samples,
+                                         const enum usart_baud_rate_mode mode, const uint8_t fraction);
+
+/**
+ * \brief Set baud rate
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] baud_rate A baud rate to set
+ */
+void _usart_sync_set_baud_rate(struct _usart_sync_device *const device, const uint32_t baud_rate);
+
+/**
+ * \brief Set data order
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] order A data order to set
+ */
+void _usart_sync_set_data_order(struct _usart_sync_device *const device, const enum usart_data_order order);
+
+/**
+ * \brief Set mode
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] mode A mode to set
+ */
+void _usart_sync_set_mode(struct _usart_sync_device *const device, const enum usart_mode mode);
+
+/**
+ * \brief Set parity
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] parity A parity to set
+ */
+void _usart_sync_set_parity(struct _usart_sync_device *const device, const enum usart_parity parity);
+
+/**
+ * \brief Set stop bits mode
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] stop_bits A stop bits mode to set
+ */
+void _usart_sync_set_stop_bits(struct _usart_sync_device *const device, const enum usart_stop_bits stop_bits);
+
+/**
+ * \brief Set character size
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] size A character size to set
+ */
+void _usart_sync_set_character_size(struct _usart_sync_device *const device, const enum usart_character_size size);
+
+/**
+ * \brief Retrieve usart status
+ *
+ * \param[in] device The pointer to USART device instance
+ */
+uint32_t _usart_sync_get_status(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Write a byte to the given USART instance
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] data Data to write
+ */
+void _usart_sync_write_byte(struct _usart_sync_device *const device, uint8_t data);
+
+/**
+ * \brief Read a byte from the given USART instance
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] data Data to write
+ *
+ * \return Data received via USART interface.
+ */
+uint8_t _usart_sync_read_byte(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Check if USART is ready to send next byte
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return Status of the ready check.
+ * \retval true if the USART is ready to send next byte
+ * \retval false if the USART is not ready to send next byte
+ */
+bool _usart_sync_is_ready_to_send(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Check if USART transmitter has sent the byte
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return Status of the ready check.
+ * \retval true if the USART transmitter has sent the byte
+ * \retval false if the USART transmitter has not send the byte
+ */
+bool _usart_sync_is_transmit_done(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Check if there is data received by USART
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return Status of the data received check.
+ * \retval true if the USART has received a byte
+ * \retval false if the USART has not received a byte
+ */
+bool _usart_sync_is_byte_received(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Set the state of flow control pins
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] state - A state of flow control pins to set
+ */
+void _usart_sync_set_flow_control_state(struct _usart_sync_device *const     device,
+                                        const union usart_flow_control_state state);
+
+/**
+ * \brief Retrieve the state of flow control pins
+ *
+ * This function retrieves the of flow control pins.
+ *
+ * \return USART_FLOW_CONTROL_STATE_UNAVAILABLE.
+ */
+union usart_flow_control_state _usart_sync_get_flow_control_state(const struct _usart_sync_device *const device);
+
+/**
+ * \brief Retrieve ordinal number of the given USART hardware instance
+ *
+ * \param[in] device The pointer to USART device instance
+ *
+ * \return The ordinal number of the given USART hardware instance
+ */
+uint8_t _usart_sync_get_hardware_index(const struct _usart_sync_device *const device);
+//@}
+
+#ifdef __cplusplus
+}
+#endif
+/**@}*/
+#endif /* _HPL_SYNC_USART_H_INCLUDED */
diff --git a/sysmoOCTSIM/hal/src/hal_usart_sync.c b/sysmoOCTSIM/hal/src/hal_usart_sync.c
new file mode 100644
index 0000000..ab99c1d
--- /dev/null
+++ b/sysmoOCTSIM/hal/src/hal_usart_sync.c
@@ -0,0 +1,276 @@
+/**
+ * \file
+ *
+ * \brief I/O USART related functionality implementation.
+ *
+ * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#include "hal_usart_sync.h"
+#include <utils_assert.h>
+#include <utils.h>
+
+/**
+ * \brief Driver version
+ */
+#define DRIVER_VERSION 0x00000001u
+
+static int32_t usart_sync_write(struct io_descriptor *const io_descr, const uint8_t *const buf, const uint16_t length);
+static int32_t usart_sync_read(struct io_descriptor *const io_descr, uint8_t *const buf, const uint16_t length);
+
+/**
+ * \brief Initialize usart interface
+ */
+int32_t usart_sync_init(struct usart_sync_descriptor *const descr, void *const hw, void *const func)
+{
+	int32_t init_status;
+	ASSERT(descr && hw);
+	init_status = _usart_sync_init(&descr->device, hw);
+	if (init_status) {
+		return init_status;
+	}
+
+	descr->io.read  = usart_sync_read;
+	descr->io.write = usart_sync_write;
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Uninitialize usart interface
+ */
+int32_t usart_sync_deinit(struct usart_sync_descriptor *const descr)
+{
+	ASSERT(descr);
+	_usart_sync_deinit(&descr->device);
+
+	descr->io.read  = NULL;
+	descr->io.write = NULL;
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Enable usart interface
+ */
+int32_t usart_sync_enable(struct usart_sync_descriptor *const descr)
+{
+	ASSERT(descr);
+	_usart_sync_enable(&descr->device);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Disable usart interface
+ */
+int32_t usart_sync_disable(struct usart_sync_descriptor *const descr)
+{
+	ASSERT(descr);
+	_usart_sync_disable(&descr->device);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Retrieve I/O descriptor
+ */
+int32_t usart_sync_get_io_descriptor(struct usart_sync_descriptor *const descr, struct io_descriptor **io)
+{
+	ASSERT(descr && io);
+
+	*io = &descr->io;
+	return ERR_NONE;
+}
+
+/**
+ * \brief Specify action for flow control pins
+ */
+int32_t usart_sync_set_flow_control(struct usart_sync_descriptor *const  descr,
+                                    const union usart_flow_control_state state)
+{
+	ASSERT(descr);
+	_usart_sync_set_flow_control_state(&descr->device, state);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Set usart baud rate
+ */
+int32_t usart_sync_set_baud_rate(struct usart_sync_descriptor *const descr, const uint32_t baud_rate)
+{
+	ASSERT(descr);
+	_usart_sync_set_baud_rate(&descr->device, baud_rate);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Set usart data order
+ */
+int32_t usart_sync_set_data_order(struct usart_sync_descriptor *const descr, const enum usart_data_order data_order)
+{
+	ASSERT(descr);
+	_usart_sync_set_data_order(&descr->device, data_order);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Set usart mode
+ */
+int32_t usart_sync_set_mode(struct usart_sync_descriptor *const descr, const enum usart_mode mode)
+{
+	ASSERT(descr);
+	_usart_sync_set_mode(&descr->device, mode);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Set usart parity
+ */
+int32_t usart_sync_set_parity(struct usart_sync_descriptor *const descr, const enum usart_parity parity)
+{
+	ASSERT(descr);
+	_usart_sync_set_parity(&descr->device, parity);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Set usart stop bits
+ */
+int32_t usart_sync_set_stopbits(struct usart_sync_descriptor *const descr, const enum usart_stop_bits stop_bits)
+{
+	ASSERT(descr);
+	_usart_sync_set_stop_bits(&descr->device, stop_bits);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Set usart character size
+ */
+int32_t usart_sync_set_character_size(struct usart_sync_descriptor *const descr, const enum usart_character_size size)
+{
+	ASSERT(descr);
+	_usart_sync_set_character_size(&descr->device, size);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Retrieve the state of flow control pins
+ */
+int32_t usart_sync_flow_control_status(const struct usart_sync_descriptor *const descr,
+                                       union usart_flow_control_state *const     state)
+{
+	ASSERT(descr && state);
+	*state = _usart_sync_get_flow_control_state(&descr->device);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Check if the usart transmitter is empty
+ */
+int32_t usart_sync_is_tx_empty(const struct usart_sync_descriptor *const descr)
+{
+	ASSERT(descr);
+	return _usart_sync_is_ready_to_send(&descr->device);
+}
+
+/**
+ * \brief Check if the usart receiver is not empty
+ */
+int32_t usart_sync_is_rx_not_empty(const struct usart_sync_descriptor *const descr)
+{
+	ASSERT(descr);
+	return _usart_sync_is_byte_received(&descr->device);
+}
+
+/**
+ * \brief Retrieve the current driver version
+ */
+uint32_t usart_sync_get_version(void)
+{
+	return DRIVER_VERSION;
+}
+
+/*
+ * \internal Write the given data to usart interface
+ *
+ * \param[in] descr The pointer to an io descriptor
+ * \param[in] buf Data to write to usart
+ * \param[in] length The number of bytes to write
+ *
+ * \return The number of bytes written.
+ */
+static int32_t usart_sync_write(struct io_descriptor *const io_descr, const uint8_t *const buf, const uint16_t length)
+{
+	uint32_t                      offset = 0;
+	struct usart_sync_descriptor *descr  = CONTAINER_OF(io_descr, struct usart_sync_descriptor, io);
+
+	ASSERT(io_descr && buf && length);
+	while (!_usart_sync_is_ready_to_send(&descr->device))
+		;
+	do {
+		_usart_sync_write_byte(&descr->device, buf[offset]);
+		while (!_usart_sync_is_ready_to_send(&descr->device))
+			;
+	} while (++offset < length);
+	while (!_usart_sync_is_transmit_done(&descr->device))
+		;
+	return (int32_t)offset;
+}
+
+/*
+ * \internal Read data from usart interface
+ *
+ * \param[in] descr The pointer to an io descriptor
+ * \param[in] buf A buffer to read data to
+ * \param[in] length The size of a buffer
+ *
+ * \return The number of bytes read.
+ */
+static int32_t usart_sync_read(struct io_descriptor *const io_descr, uint8_t *const buf, const uint16_t length)
+{
+	uint32_t                      offset = 0;
+	struct usart_sync_descriptor *descr  = CONTAINER_OF(io_descr, struct usart_sync_descriptor, io);
+
+	ASSERT(io_descr && buf && length);
+	do {
+		while (!_usart_sync_is_byte_received(&descr->device))
+			;
+		buf[offset] = _usart_sync_read_byte(&descr->device);
+	} while (++offset < length);
+
+	return (int32_t)offset;
+}
diff --git a/sysmoOCTSIM/hpl/sercom/hpl_sercom.c b/sysmoOCTSIM/hpl/sercom/hpl_sercom.c
new file mode 100644
index 0000000..130f63a
--- /dev/null
+++ b/sysmoOCTSIM/hpl/sercom/hpl_sercom.c
@@ -0,0 +1,2948 @@
+
+/**
+ * \file
+ *
+ * \brief SAM Serial Communication Interface
+ *
+ * Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+#include <hpl_dma.h>
+#include <hpl_i2c_m_async.h>
+#include <hpl_i2c_m_sync.h>
+#include <hpl_i2c_s_async.h>
+#include <hpl_sercom_config.h>
+#include <hpl_spi_m_async.h>
+#include <hpl_spi_m_sync.h>
+#include <hpl_spi_s_async.h>
+#include <hpl_spi_s_sync.h>
+#include <hpl_usart_async.h>
+#include <hpl_usart_sync.h>
+#include <utils.h>
+#include <utils_assert.h>
+
+#ifndef CONF_SERCOM_0_USART_ENABLE
+#define CONF_SERCOM_0_USART_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_1_USART_ENABLE
+#define CONF_SERCOM_1_USART_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_2_USART_ENABLE
+#define CONF_SERCOM_2_USART_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_3_USART_ENABLE
+#define CONF_SERCOM_3_USART_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_4_USART_ENABLE
+#define CONF_SERCOM_4_USART_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_5_USART_ENABLE
+#define CONF_SERCOM_5_USART_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_6_USART_ENABLE
+#define CONF_SERCOM_6_USART_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_7_USART_ENABLE
+#define CONF_SERCOM_7_USART_ENABLE 0
+#endif
+
+/** Amount of SERCOM that is used as USART. */
+#define SERCOM_USART_AMOUNT                                                                                            \
+	(CONF_SERCOM_0_USART_ENABLE + CONF_SERCOM_1_USART_ENABLE + CONF_SERCOM_2_USART_ENABLE + CONF_SERCOM_3_USART_ENABLE \
+	 + CONF_SERCOM_4_USART_ENABLE + CONF_SERCOM_5_USART_ENABLE + CONF_SERCOM_6_USART_ENABLE                            \
+	 + CONF_SERCOM_7_USART_ENABLE)
+
+/**
+ * \brief Macro is used to fill usart configuration structure based on
+ * its number
+ *
+ * \param[in] n The number of structures
+ */
+#define SERCOM_CONFIGURATION(n)                                                                                        \
+	{                                                                                                                  \
+		n,                                                                                                             \
+		    SERCOM_USART_CTRLA_MODE(CONF_SERCOM_##n##_USART_MODE)                                                      \
+		        | (CONF_SERCOM_##n##_USART_RUNSTDBY << SERCOM_USART_CTRLA_RUNSTDBY_Pos)                                \
+		        | (CONF_SERCOM_##n##_USART_IBON << SERCOM_USART_CTRLA_IBON_Pos)                                        \
+		        | (CONF_SERCOM_##n##_USART_TXINV << SERCOM_USART_CTRLA_TXINV_Pos)                                      \
+		        | (CONF_SERCOM_##n##_USART_RXINV << SERCOM_USART_CTRLA_RXINV_Pos)                                      \
+		        | SERCOM_USART_CTRLA_SAMPR(CONF_SERCOM_##n##_USART_SAMPR)                                              \
+		        | SERCOM_USART_CTRLA_TXPO(CONF_SERCOM_##n##_USART_TXPO)                                                \
+		        | SERCOM_USART_CTRLA_RXPO(CONF_SERCOM_##n##_USART_RXPO)                                                \
+		        | SERCOM_USART_CTRLA_SAMPA(CONF_SERCOM_##n##_USART_SAMPA)                                              \
+		        | SERCOM_USART_CTRLA_FORM(CONF_SERCOM_##n##_USART_FORM)                                                \
+		        | (CONF_SERCOM_##n##_USART_CMODE << SERCOM_USART_CTRLA_CMODE_Pos)                                      \
+		        | (CONF_SERCOM_##n##_USART_CPOL << SERCOM_USART_CTRLA_CPOL_Pos)                                        \
+		        | (CONF_SERCOM_##n##_USART_DORD << SERCOM_USART_CTRLA_DORD_Pos),                                       \
+		    SERCOM_USART_CTRLB_CHSIZE(CONF_SERCOM_##n##_USART_CHSIZE)                                                  \
+		        | (CONF_SERCOM_##n##_USART_SBMODE << SERCOM_USART_CTRLB_SBMODE_Pos)                                    \
+		        | (CONF_SERCOM_##n##_USART_CLODEN << SERCOM_USART_CTRLB_COLDEN_Pos)                                    \
+		        | (CONF_SERCOM_##n##_USART_SFDE << SERCOM_USART_CTRLB_SFDE_Pos)                                        \
+		        | (CONF_SERCOM_##n##_USART_ENC << SERCOM_USART_CTRLB_ENC_Pos)                                          \
+		        | (CONF_SERCOM_##n##_USART_PMODE << SERCOM_USART_CTRLB_PMODE_Pos)                                      \
+		        | (CONF_SERCOM_##n##_USART_TXEN << SERCOM_USART_CTRLB_TXEN_Pos)                                        \
+		        | (CONF_SERCOM_##n##_USART_RXEN << SERCOM_USART_CTRLB_RXEN_Pos),                                       \
+		    SERCOM_USART_CTRLC_GTIME(CONF_SERCOM_##n##_USART_GTIME)                                                    \
+		        | (CONF_SERCOM_##n##_USART_DSNACK << SERCOM_USART_CTRLC_DSNACK_Pos)                                    \
+		        | (CONF_SERCOM_##n##_USART_INACK << SERCOM_USART_CTRLC_INACK_Pos)                                      \
+		        | SERCOM_USART_CTRLC_MAXITER(CONF_SERCOM_##n##_USART_MAXITER),                                         \
+		    (uint16_t)(CONF_SERCOM_##n##_USART_BAUD_RATE), CONF_SERCOM_##n##_USART_FRACTIONAL,                         \
+		    CONF_SERCOM_##n##_USART_RECEIVE_PULSE_LENGTH, CONF_SERCOM_##n##_USART_DEBUG_STOP_MODE,                     \
+	}
+
+/**
+ * \brief SERCOM USART configuration type
+ */
+struct usart_configuration {
+	uint8_t                       number;
+	hri_sercomusart_ctrla_reg_t   ctrl_a;
+	hri_sercomusart_ctrlb_reg_t   ctrl_b;
+	hri_sercomusart_ctrlc_reg_t   ctrl_c;
+	hri_sercomusart_baud_reg_t    baud;
+	uint8_t                       fractional;
+	hri_sercomusart_rxpl_reg_t    rxpl;
+	hri_sercomusart_dbgctrl_reg_t debug_ctrl;
+};
+
+#if SERCOM_USART_AMOUNT < 1
+/** Dummy array to pass compiling. */
+static struct usart_configuration _usarts[1] = {{0}};
+#else
+/**
+ * \brief Array of SERCOM USART configurations
+ */
+static struct usart_configuration _usarts[] = {
+#if CONF_SERCOM_0_USART_ENABLE == 1
+    SERCOM_CONFIGURATION(0),
+#endif
+#if CONF_SERCOM_1_USART_ENABLE == 1
+    SERCOM_CONFIGURATION(1),
+#endif
+#if CONF_SERCOM_2_USART_ENABLE == 1
+    SERCOM_CONFIGURATION(2),
+#endif
+#if CONF_SERCOM_3_USART_ENABLE == 1
+    SERCOM_CONFIGURATION(3),
+#endif
+#if CONF_SERCOM_4_USART_ENABLE == 1
+    SERCOM_CONFIGURATION(4),
+#endif
+#if CONF_SERCOM_5_USART_ENABLE == 1
+    SERCOM_CONFIGURATION(5),
+#endif
+#if CONF_SERCOM_6_USART_ENABLE == 1
+    SERCOM_CONFIGURATION(6),
+#endif
+#if CONF_SERCOM_7_USART_ENABLE == 1
+    SERCOM_CONFIGURATION(7),
+#endif
+};
+#endif
+
+static uint8_t _get_sercom_index(const void *const hw);
+static uint8_t _sercom_get_irq_num(const void *const hw);
+static void    _sercom_init_irq_param(const void *const hw, void *dev);
+static uint8_t _sercom_get_hardware_index(const void *const hw);
+
+static int32_t     _usart_init(void *const hw);
+static inline void _usart_deinit(void *const hw);
+static uint16_t    _usart_calculate_baud_rate(const uint32_t baud, const uint32_t clock_rate, const uint8_t samples,
+                                              const enum usart_baud_rate_mode mode, const uint8_t fraction);
+static void        _usart_set_baud_rate(void *const hw, const uint32_t baud_rate);
+static void        _usart_set_data_order(void *const hw, const enum usart_data_order order);
+static void        _usart_set_mode(void *const hw, const enum usart_mode mode);
+static void        _usart_set_parity(void *const hw, const enum usart_parity parity);
+static void        _usart_set_stop_bits(void *const hw, const enum usart_stop_bits stop_bits);
+static void        _usart_set_character_size(void *const hw, const enum usart_character_size size);
+
+/**
+ * \brief Initialize synchronous SERCOM USART
+ */
+int32_t _usart_sync_init(struct _usart_sync_device *const device, void *const hw)
+{
+	ASSERT(device);
+
+	device->hw = hw;
+
+	return _usart_init(hw);
+}
+
+/**
+ * \brief Initialize asynchronous SERCOM USART
+ */
+int32_t _usart_async_init(struct _usart_async_device *const device, void *const hw)
+{
+	int32_t init_status;
+
+	ASSERT(device);
+
+	init_status = _usart_init(hw);
+	if (init_status) {
+		return init_status;
+	}
+	device->hw = hw;
+	_sercom_init_irq_param(hw, (void *)device);
+	uint8_t irq = _sercom_get_irq_num(hw);
+	for (uint32_t i = 0; i < 4; i++) {
+		NVIC_DisableIRQ((IRQn_Type)irq);
+		NVIC_ClearPendingIRQ((IRQn_Type)irq);
+		NVIC_EnableIRQ((IRQn_Type)irq);
+		irq++;
+	}
+	return ERR_NONE;
+}
+
+/**
+ * \brief De-initialize SERCOM USART
+ */
+void _usart_sync_deinit(struct _usart_sync_device *const device)
+{
+	_usart_deinit(device->hw);
+}
+
+/**
+ * \brief De-initialize SERCOM USART
+ */
+void _usart_async_deinit(struct _usart_async_device *const device)
+{
+	NVIC_DisableIRQ((IRQn_Type)_sercom_get_irq_num(device->hw));
+	_usart_deinit(device->hw);
+}
+
+/**
+ * \brief Calculate baud rate register value
+ */
+uint16_t _usart_sync_calculate_baud_rate(const uint32_t baud, const uint32_t clock_rate, const uint8_t samples,
+                                         const enum usart_baud_rate_mode mode, const uint8_t fraction)
+{
+	return _usart_calculate_baud_rate(baud, clock_rate, samples, mode, fraction);
+}
+
+/**
+ * \brief Calculate baud rate register value
+ */
+uint16_t _usart_async_calculate_baud_rate(const uint32_t baud, const uint32_t clock_rate, const uint8_t samples,
+                                          const enum usart_baud_rate_mode mode, const uint8_t fraction)
+{
+	return _usart_calculate_baud_rate(baud, clock_rate, samples, mode, fraction);
+}
+
+/**
+ * \brief Enable SERCOM module
+ */
+void _usart_sync_enable(struct _usart_sync_device *const device)
+{
+	hri_sercomusart_set_CTRLA_ENABLE_bit(device->hw);
+}
+
+/**
+ * \brief Enable SERCOM module
+ */
+void _usart_async_enable(struct _usart_async_device *const device)
+{
+	hri_sercomusart_set_CTRLA_ENABLE_bit(device->hw);
+}
+
+/**
+ * \brief Disable SERCOM module
+ */
+void _usart_sync_disable(struct _usart_sync_device *const device)
+{
+	hri_sercomusart_clear_CTRLA_ENABLE_bit(device->hw);
+}
+
+/**
+ * \brief Disable SERCOM module
+ */
+void _usart_async_disable(struct _usart_async_device *const device)
+{
+	hri_sercomusart_clear_CTRLA_ENABLE_bit(device->hw);
+}
+
+/**
+ * \brief Set baud rate
+ */
+void _usart_sync_set_baud_rate(struct _usart_sync_device *const device, const uint32_t baud_rate)
+{
+	_usart_set_baud_rate(device->hw, baud_rate);
+}
+
+/**
+ * \brief Set baud rate
+ */
+void _usart_async_set_baud_rate(struct _usart_async_device *const device, const uint32_t baud_rate)
+{
+	_usart_set_baud_rate(device->hw, baud_rate);
+}
+
+/**
+ * \brief Set data order
+ */
+void _usart_sync_set_data_order(struct _usart_sync_device *const device, const enum usart_data_order order)
+{
+	_usart_set_data_order(device->hw, order);
+}
+
+/**
+ * \brief Set data order
+ */
+void _usart_async_set_data_order(struct _usart_async_device *const device, const enum usart_data_order order)
+{
+	_usart_set_data_order(device->hw, order);
+}
+
+/**
+ * \brief Set mode
+ */
+void _usart_sync_set_mode(struct _usart_sync_device *const device, const enum usart_mode mode)
+{
+	_usart_set_mode(device->hw, mode);
+}
+
+/**
+ * \brief Set mode
+ */
+void _usart_async_set_mode(struct _usart_async_device *const device, const enum usart_mode mode)
+{
+	_usart_set_mode(device->hw, mode);
+}
+
+/**
+ * \brief Set parity
+ */
+void _usart_sync_set_parity(struct _usart_sync_device *const device, const enum usart_parity parity)
+{
+	_usart_set_parity(device->hw, parity);
+}
+
+/**
+ * \brief Set parity
+ */
+void _usart_async_set_parity(struct _usart_async_device *const device, const enum usart_parity parity)
+{
+	_usart_set_parity(device->hw, parity);
+}
+
+/**
+ * \brief Set stop bits mode
+ */
+void _usart_sync_set_stop_bits(struct _usart_sync_device *const device, const enum usart_stop_bits stop_bits)
+{
+	_usart_set_stop_bits(device->hw, stop_bits);
+}
+
+/**
+ * \brief Set stop bits mode
+ */
+void _usart_async_set_stop_bits(struct _usart_async_device *const device, const enum usart_stop_bits stop_bits)
+{
+	_usart_set_stop_bits(device->hw, stop_bits);
+}
+
+/**
+ * \brief Set character size
+ */
+void _usart_sync_set_character_size(struct _usart_sync_device *const device, const enum usart_character_size size)
+{
+	_usart_set_character_size(device->hw, size);
+}
+
+/**
+ * \brief Set character size
+ */
+void _usart_async_set_character_size(struct _usart_async_device *const device, const enum usart_character_size size)
+{
+	_usart_set_character_size(device->hw, size);
+}
+
+/**
+ * \brief Retrieve SERCOM usart status
+ */
+uint32_t _usart_sync_get_status(const struct _usart_sync_device *const device)
+{
+	return hri_sercomusart_read_STATUS_reg(device->hw);
+}
+
+/**
+ * \brief Retrieve SERCOM usart status
+ */
+uint32_t _usart_async_get_status(const struct _usart_async_device *const device)
+{
+	return hri_sercomusart_read_STATUS_reg(device->hw);
+}
+
+/**
+ * \brief Write a byte to the given SERCOM USART instance
+ */
+void _usart_sync_write_byte(struct _usart_sync_device *const device, uint8_t data)
+{
+	hri_sercomusart_write_DATA_reg(device->hw, data);
+}
+
+/**
+ * \brief Write a byte to the given SERCOM USART instance
+ */
+void _usart_async_write_byte(struct _usart_async_device *const device, uint8_t data)
+{
+	hri_sercomusart_write_DATA_reg(device->hw, data);
+}
+
+/**
+ * \brief Read a byte from the given SERCOM USART instance
+ */
+uint8_t _usart_sync_read_byte(const struct _usart_sync_device *const device)
+{
+	return hri_sercomusart_read_DATA_reg(device->hw);
+}
+
+/**
+ * \brief Check if USART is ready to send next byte
+ */
+bool _usart_sync_is_ready_to_send(const struct _usart_sync_device *const device)
+{
+	return hri_sercomusart_get_interrupt_DRE_bit(device->hw);
+}
+
+/**
+ * \brief Check if USART transmission complete
+ */
+bool _usart_sync_is_transmit_done(const struct _usart_sync_device *const device)
+{
+	return hri_sercomusart_get_interrupt_TXC_bit(device->hw);
+}
+
+/**
+ * \brief Check if USART is ready to send next byte
+ */
+bool _usart_async_is_byte_sent(const struct _usart_async_device *const device)
+{
+	return hri_sercomusart_get_interrupt_DRE_bit(device->hw);
+}
+
+/**
+ * \brief Check if there is data received by USART
+ */
+bool _usart_sync_is_byte_received(const struct _usart_sync_device *const device)
+{
+	return hri_sercomusart_get_interrupt_RXC_bit(device->hw);
+}
+
+/**
+ * \brief Set the state of flow control pins
+ */
+void _usart_sync_set_flow_control_state(struct _usart_sync_device *const     device,
+                                        const union usart_flow_control_state state)
+{
+	(void)device;
+	(void)state;
+}
+
+/**
+ * \brief Set the state of flow control pins
+ */
+void _usart_async_set_flow_control_state(struct _usart_async_device *const    device,
+                                         const union usart_flow_control_state state)
+{
+	(void)device;
+	(void)state;
+}
+
+/**
+ * \brief Retrieve the state of flow control pins
+ */
+union usart_flow_control_state _usart_sync_get_flow_control_state(const struct _usart_sync_device *const device)
+{
+	(void)device;
+	union usart_flow_control_state state;
+
+	state.value           = 0;
+	state.bit.unavailable = 1;
+	return state;
+}
+
+/**
+ * \brief Retrieve the state of flow control pins
+ */
+union usart_flow_control_state _usart_async_get_flow_control_state(const struct _usart_async_device *const device)
+{
+	(void)device;
+	union usart_flow_control_state state;
+
+	state.value           = 0;
+	state.bit.unavailable = 1;
+	return state;
+}
+
+/**
+ * \brief Enable data register empty interrupt
+ */
+void _usart_async_enable_byte_sent_irq(struct _usart_async_device *const device)
+{
+	hri_sercomusart_set_INTEN_DRE_bit(device->hw);
+}
+
+/**
+ * \brief Enable transmission complete interrupt
+ */
+void _usart_async_enable_tx_done_irq(struct _usart_async_device *const device)
+{
+	hri_sercomusart_set_INTEN_TXC_bit(device->hw);
+}
+
+/**
+ * \brief Retrieve ordinal number of the given sercom hardware instance
+ */
+static uint8_t _sercom_get_hardware_index(const void *const hw)
+{
+	Sercom *const sercom_modules[] = SERCOM_INSTS;
+	/* Find index for SERCOM instance. */
+	for (uint32_t i = 0; i < SERCOM_INST_NUM; i++) {
+		if ((uint32_t)hw == (uint32_t)sercom_modules[i]) {
+			return i;
+		}
+	}
+	return 0;
+}
+
+/**
+ * \brief Retrieve ordinal number of the given SERCOM USART hardware instance
+ */
+uint8_t _usart_sync_get_hardware_index(const struct _usart_sync_device *const device)
+{
+	return _sercom_get_hardware_index(device->hw);
+}
+
+/**
+ * \brief Retrieve ordinal number of the given SERCOM USART hardware instance
+ */
+uint8_t _usart_async_get_hardware_index(const struct _usart_async_device *const device)
+{
+	return _sercom_get_hardware_index(device->hw);
+}
+
+/**
+ * \brief Enable/disable USART interrupt
+ */
+void _usart_async_set_irq_state(struct _usart_async_device *const device, const enum _usart_async_callback_type type,
+                                const bool state)
+{
+	ASSERT(device);
+
+	if (USART_ASYNC_BYTE_SENT == type || USART_ASYNC_TX_DONE == type) {
+		hri_sercomusart_write_INTEN_DRE_bit(device->hw, state);
+		hri_sercomusart_write_INTEN_TXC_bit(device->hw, state);
+	} else if (USART_ASYNC_RX_DONE == type) {
+		hri_sercomusart_write_INTEN_RXC_bit(device->hw, state);
+	} else if (USART_ASYNC_ERROR == type) {
+		hri_sercomusart_write_INTEN_ERROR_bit(device->hw, state);
+	}
+}
+
+/**
+ * \internal Retrieve ordinal number of the given sercom hardware instance
+ *
+ * \param[in] hw The pointer to hardware instance
+
+ * \return The ordinal number of the given sercom hardware instance
+ */
+static uint8_t _get_sercom_index(const void *const hw)
+{
+	uint8_t sercom_offset = _sercom_get_hardware_index(hw);
+	uint8_t i;
+
+	for (i = 0; i < ARRAY_SIZE(_usarts); i++) {
+		if (_usarts[i].number == sercom_offset) {
+			return i;
+		}
+	}
+
+	ASSERT(false);
+	return 0;
+}
+
+/**
+ * \brief Init irq param with the given sercom hardware instance
+ */
+static void _sercom_init_irq_param(const void *const hw, void *dev)
+{
+}
+
+/**
+ * \internal Initialize SERCOM USART
+ *
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return The status of initialization
+ */
+static int32_t _usart_init(void *const hw)
+{
+	uint8_t i = _get_sercom_index(hw);
+
+	if (!hri_sercomusart_is_syncing(hw, SERCOM_USART_SYNCBUSY_SWRST)) {
+		uint32_t mode = _usarts[i].ctrl_a & SERCOM_USART_CTRLA_MODE_Msk;
+		if (hri_sercomusart_get_CTRLA_reg(hw, SERCOM_USART_CTRLA_ENABLE)) {
+			hri_sercomusart_clear_CTRLA_ENABLE_bit(hw);
+			hri_sercomusart_wait_for_sync(hw, SERCOM_USART_SYNCBUSY_ENABLE);
+		}
+		hri_sercomusart_write_CTRLA_reg(hw, SERCOM_USART_CTRLA_SWRST | mode);
+	}
+	hri_sercomusart_wait_for_sync(hw, SERCOM_USART_SYNCBUSY_SWRST);
+
+	hri_sercomusart_write_CTRLA_reg(hw, _usarts[i].ctrl_a);
+	hri_sercomusart_write_CTRLB_reg(hw, _usarts[i].ctrl_b);
+	hri_sercomusart_write_CTRLC_reg(hw, _usarts[i].ctrl_c);
+	if ((_usarts[i].ctrl_a & SERCOM_USART_CTRLA_SAMPR(0x1)) || (_usarts[i].ctrl_a & SERCOM_USART_CTRLA_SAMPR(0x3))) {
+		((Sercom *)hw)->USART.BAUD.FRAC.BAUD = _usarts[i].baud;
+		((Sercom *)hw)->USART.BAUD.FRAC.FP   = _usarts[i].fractional;
+	} else {
+		hri_sercomusart_write_BAUD_reg(hw, _usarts[i].baud);
+	}
+
+	hri_sercomusart_write_RXPL_reg(hw, _usarts[i].rxpl);
+	hri_sercomusart_write_DBGCTRL_reg(hw, _usarts[i].debug_ctrl);
+
+	return ERR_NONE;
+}
+
+/**
+ * \internal De-initialize SERCOM USART
+ *
+ * \param[in] hw The pointer to hardware instance
+ */
+static inline void _usart_deinit(void *const hw)
+{
+	hri_sercomusart_clear_CTRLA_ENABLE_bit(hw);
+	hri_sercomusart_set_CTRLA_SWRST_bit(hw);
+}
+
+/**
+ * \internal Calculate baud rate register value
+ *
+ * \param[in] baud Required baud rate
+ * \param[in] clock_rate SERCOM clock frequency
+ * \param[in] samples The number of samples
+ * \param[in] mode USART mode
+ * \param[in] fraction A fraction value
+ *
+ * \return Calculated baud rate register value
+ */
+static uint16_t _usart_calculate_baud_rate(const uint32_t baud, const uint32_t clock_rate, const uint8_t samples,
+                                           const enum usart_baud_rate_mode mode, const uint8_t fraction)
+{
+	if (USART_BAUDRATE_ASYNCH_ARITHMETIC == mode) {
+		return 65536 - ((uint64_t)65536 * samples * baud) / clock_rate;
+	}
+
+	if (USART_BAUDRATE_ASYNCH_FRACTIONAL == mode) {
+		return clock_rate / baud / samples + SERCOM_USART_BAUD_FRACFP_FP(fraction);
+	}
+
+	if (USART_BAUDRATE_SYNCH == mode) {
+		return clock_rate / baud / 2 - 1;
+	}
+
+	return 0;
+}
+
+/**
+ * \internal Set baud rate
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] baud_rate A baud rate to set
+ */
+static void _usart_set_baud_rate(void *const hw, const uint32_t baud_rate)
+{
+	bool enabled = hri_sercomusart_get_CTRLA_ENABLE_bit(hw);
+
+	hri_sercomusart_clear_CTRLA_ENABLE_bit(hw);
+
+	CRITICAL_SECTION_ENTER()
+	hri_sercomusart_wait_for_sync(hw, SERCOM_USART_SYNCBUSY_ENABLE);
+	hri_sercomusart_write_BAUD_reg(hw, baud_rate);
+	CRITICAL_SECTION_LEAVE()
+
+	hri_sercomusart_write_CTRLA_ENABLE_bit(hw, enabled);
+}
+
+/**
+ * \internal Set data order
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] order A data order to set
+ */
+static void _usart_set_data_order(void *const hw, const enum usart_data_order order)
+{
+	bool enabled = hri_sercomusart_get_CTRLA_ENABLE_bit(hw);
+
+	hri_sercomusart_clear_CTRLA_ENABLE_bit(hw);
+
+	CRITICAL_SECTION_ENTER()
+	hri_sercomusart_wait_for_sync(hw, SERCOM_USART_SYNCBUSY_ENABLE);
+	hri_sercomusart_write_CTRLA_DORD_bit(hw, order);
+	CRITICAL_SECTION_LEAVE()
+
+	hri_sercomusart_write_CTRLA_ENABLE_bit(hw, enabled);
+}
+
+/**
+ * \internal Set mode
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] mode A mode to set
+ */
+static void _usart_set_mode(void *const hw, const enum usart_mode mode)
+{
+	bool enabled = hri_sercomusart_get_CTRLA_ENABLE_bit(hw);
+
+	hri_sercomusart_clear_CTRLA_ENABLE_bit(hw);
+
+	CRITICAL_SECTION_ENTER()
+	hri_sercomusart_wait_for_sync(hw, SERCOM_USART_SYNCBUSY_ENABLE);
+	hri_sercomusart_write_CTRLA_CMODE_bit(hw, mode);
+	CRITICAL_SECTION_LEAVE()
+
+	hri_sercomusart_write_CTRLA_ENABLE_bit(hw, enabled);
+}
+
+/**
+ * \internal Set parity
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] parity A parity to set
+ */
+static void _usart_set_parity(void *const hw, const enum usart_parity parity)
+{
+	bool enabled = hri_sercomusart_get_CTRLA_ENABLE_bit(hw);
+
+	hri_sercomusart_clear_CTRLA_ENABLE_bit(hw);
+
+	CRITICAL_SECTION_ENTER()
+	hri_sercomusart_wait_for_sync(hw, SERCOM_USART_SYNCBUSY_ENABLE);
+
+	if (USART_PARITY_NONE != parity) {
+		hri_sercomusart_set_CTRLA_FORM_bf(hw, 1);
+	} else {
+		hri_sercomusart_clear_CTRLA_FORM_bf(hw, 1);
+	}
+
+	hri_sercomusart_write_CTRLB_PMODE_bit(hw, parity);
+	CRITICAL_SECTION_LEAVE()
+
+	hri_sercomusart_write_CTRLA_ENABLE_bit(hw, enabled);
+}
+
+/**
+ * \internal Set stop bits mode
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] stop_bits A stop bits mode to set
+ */
+static void _usart_set_stop_bits(void *const hw, const enum usart_stop_bits stop_bits)
+{
+	bool enabled = hri_sercomusart_get_CTRLA_ENABLE_bit(hw);
+
+	hri_sercomusart_clear_CTRLA_ENABLE_bit(hw);
+
+	CRITICAL_SECTION_ENTER()
+	hri_sercomusart_wait_for_sync(hw, SERCOM_USART_SYNCBUSY_ENABLE);
+	hri_sercomusart_write_CTRLB_SBMODE_bit(hw, stop_bits);
+	CRITICAL_SECTION_LEAVE()
+
+	hri_sercomusart_write_CTRLA_ENABLE_bit(hw, enabled);
+}
+
+/**
+ * \internal Set character size
+ *
+ * \param[in] device The pointer to USART device instance
+ * \param[in] size A character size to set
+ */
+static void _usart_set_character_size(void *const hw, const enum usart_character_size size)
+{
+	bool enabled = hri_sercomusart_get_CTRLA_ENABLE_bit(hw);
+
+	hri_sercomusart_clear_CTRLA_ENABLE_bit(hw);
+
+	CRITICAL_SECTION_ENTER()
+	hri_sercomusart_wait_for_sync(hw, SERCOM_USART_SYNCBUSY_ENABLE);
+	hri_sercomusart_write_CTRLB_CHSIZE_bf(hw, size);
+	CRITICAL_SECTION_LEAVE()
+
+	if (enabled) {
+		hri_sercomusart_set_CTRLA_ENABLE_bit(hw);
+	}
+}
+
+	/* Sercom I2C implementation */
+
+#ifndef CONF_SERCOM_0_I2CM_ENABLE
+#define CONF_SERCOM_0_I2CM_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_1_I2CM_ENABLE
+#define CONF_SERCOM_1_I2CM_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_2_I2CM_ENABLE
+#define CONF_SERCOM_2_I2CM_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_3_I2CM_ENABLE
+#define CONF_SERCOM_3_I2CM_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_4_I2CM_ENABLE
+#define CONF_SERCOM_4_I2CM_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_5_I2CM_ENABLE
+#define CONF_SERCOM_5_I2CM_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_6_I2CM_ENABLE
+#define CONF_SERCOM_6_I2CM_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_7_I2CM_ENABLE
+#define CONF_SERCOM_7_I2CM_ENABLE 0
+#endif
+
+/** Amount of SERCOM that is used as I2C Master. */
+#define SERCOM_I2CM_AMOUNT                                                                                             \
+	(CONF_SERCOM_0_I2CM_ENABLE + CONF_SERCOM_1_I2CM_ENABLE + CONF_SERCOM_2_I2CM_ENABLE + CONF_SERCOM_3_I2CM_ENABLE     \
+	 + CONF_SERCOM_4_I2CM_ENABLE + CONF_SERCOM_5_I2CM_ENABLE + CONF_SERCOM_6_I2CM_ENABLE + CONF_SERCOM_7_I2CM_ENABLE)
+
+/**
+ * \brief Macro is used to fill i2cm configuration structure based on
+ * its number
+ *
+ * \param[in] n The number of structures
+ */
+#define I2CM_CONFIGURATION(n)                                                                                          \
+	{                                                                                                                  \
+		(n),                                                                                                           \
+		    (SERCOM_I2CM_CTRLA_MODE_I2C_MASTER) | (CONF_SERCOM_##n##_I2CM_RUNSTDBY << SERCOM_I2CM_CTRLA_RUNSTDBY_Pos)  \
+		        | (CONF_SERCOM_##n##_I2CM_SPEED << SERCOM_I2CM_CTRLA_SPEED_Pos)                                        \
+		        | (CONF_SERCOM_##n##_I2CM_MEXTTOEN << SERCOM_I2CM_CTRLA_MEXTTOEN_Pos)                                  \
+		        | (CONF_SERCOM_##n##_I2CM_SEXTTOEN << SERCOM_I2CM_CTRLA_SEXTTOEN_Pos)                                  \
+		        | (CONF_SERCOM_##n##_I2CM_INACTOUT << SERCOM_I2CM_CTRLA_INACTOUT_Pos)                                  \
+		        | (CONF_SERCOM_##n##_I2CM_LOWTOUT << SERCOM_I2CM_CTRLA_LOWTOUTEN_Pos)                                  \
+		        | (CONF_SERCOM_##n##_I2CM_SDAHOLD << SERCOM_I2CM_CTRLA_SDAHOLD_Pos),                                   \
+		    SERCOM_I2CM_CTRLB_SMEN, (uint32_t)(CONF_SERCOM_##n##_I2CM_BAUD_RATE),                                      \
+		    CONF_SERCOM_##n##_I2CM_DEBUG_STOP_MODE, CONF_SERCOM_##n##_I2CM_TRISE, CONF_GCLK_SERCOM##n##_CORE_FREQUENCY \
+	}
+
+#define ERROR_FLAG (1 << 7)
+#define SB_FLAG (1 << 1)
+#define MB_FLAG (1 << 0)
+
+#define CMD_STOP 0x3
+#define I2C_IDLE 0x1
+#define I2C_SM 0x0
+#define I2C_FM 0x1
+#define I2C_HS 0x2
+#define TEN_ADDR_FRAME 0x78
+#define TEN_ADDR_MASK 0x3ff
+#define SEVEN_ADDR_MASK 0x7f
+
+/**
+ * \brief SERCOM I2CM configuration type
+ */
+struct i2cm_configuration {
+	uint8_t                      number;
+	hri_sercomi2cm_ctrla_reg_t   ctrl_a;
+	hri_sercomi2cm_ctrlb_reg_t   ctrl_b;
+	hri_sercomi2cm_baud_reg_t    baud;
+	hri_sercomi2cm_dbgctrl_reg_t dbgctrl;
+	uint16_t                     trise;
+	uint32_t                     clk; /* SERCOM peripheral clock frequency */
+};
+
+static inline void _i2c_m_enable_implementation(void *hw);
+static int32_t     _i2c_m_sync_init_impl(struct _i2c_m_service *const service, void *const hw);
+
+#if SERCOM_I2CM_AMOUNT < 1
+/** Dummy array to pass compiling. */
+static struct i2cm_configuration _i2cms[1] = {{0}};
+#else
+/**
+ * \brief Array of SERCOM I2CM configurations
+ */
+static struct i2cm_configuration _i2cms[] = {
+#if CONF_SERCOM_0_I2CM_ENABLE == 1
+    I2CM_CONFIGURATION(0),
+#endif
+#if CONF_SERCOM_1_I2CM_ENABLE == 1
+    I2CM_CONFIGURATION(1),
+#endif
+#if CONF_SERCOM_2_I2CM_ENABLE == 1
+    I2CM_CONFIGURATION(2),
+#endif
+#if CONF_SERCOM_3_I2CM_ENABLE == 1
+    I2CM_CONFIGURATION(3),
+#endif
+#if CONF_SERCOM_4_I2CM_ENABLE == 1
+    I2CM_CONFIGURATION(4),
+#endif
+#if CONF_SERCOM_5_I2CM_ENABLE == 1
+    I2CM_CONFIGURATION(5),
+#endif
+#if CONF_SERCOM_6_I2CM_ENABLE == 1
+    I2CM_CONFIGURATION(6),
+#endif
+#if CONF_SERCOM_7_I2CM_ENABLE == 1
+    I2CM_CONFIGURATION(7),
+#endif
+};
+#endif
+
+/**
+ * \internal Retrieve ordinal number of the given sercom hardware instance
+ *
+ * \param[in] hw The pointer to hardware instance
+
+ * \return The ordinal number of the given sercom hardware instance
+ */
+static int8_t _get_i2cm_index(const void *const hw)
+{
+	uint8_t sercom_offset = _sercom_get_hardware_index(hw);
+	uint8_t i;
+
+	for (i = 0; i < ARRAY_SIZE(_i2cms); i++) {
+		if (_i2cms[i].number == sercom_offset) {
+			return i;
+		}
+	}
+
+	ASSERT(false);
+	return -1;
+}
+
+static inline void _sercom_i2c_send_stop(void *const hw)
+{
+	hri_sercomi2cm_set_CTRLB_CMD_bf(hw, CMD_STOP);
+}
+
+/**
+ * \brief SERCOM I2CM analyze hardware status and transfer next byte
+ */
+static inline int32_t _sercom_i2c_sync_analyse_flags(void *const hw, uint32_t flags, struct _i2c_m_msg *const msg)
+{
+	int      sclsm  = hri_sercomi2cm_get_CTRLA_SCLSM_bit(hw);
+	uint16_t status = hri_sercomi2cm_read_STATUS_reg(hw);
+
+	if (flags & MB_FLAG) {
+		/* tx error */
+		if (status & SERCOM_I2CM_STATUS_ARBLOST) {
+			hri_sercomi2cm_clear_interrupt_MB_bit(hw);
+			msg->flags |= I2C_M_FAIL;
+			msg->flags &= ~I2C_M_BUSY;
+
+			if (status & SERCOM_I2CM_STATUS_BUSERR) {
+				return I2C_ERR_BUS;
+			}
+
+			return I2C_ERR_BAD_ADDRESS;
+		} else {
+			if (status & SERCOM_I2CM_STATUS_RXNACK) {
+
+				/* Slave rejects to receive more data */
+				if (msg->len > 0) {
+					msg->flags |= I2C_M_FAIL;
+				}
+
+				if (msg->flags & I2C_M_STOP) {
+					_sercom_i2c_send_stop(hw);
+				}
+
+				msg->flags &= ~I2C_M_BUSY;
+
+				return I2C_NACK;
+			}
+
+			if (msg->flags & I2C_M_TEN) {
+				hri_sercomi2cm_write_ADDR_reg(hw,
+				                              ((((msg->addr & TEN_ADDR_MASK) >> 8) | TEN_ADDR_FRAME) << 1) | I2C_M_RD
+				                                  | (hri_sercomi2cm_read_ADDR_reg(hw) & SERCOM_I2CM_ADDR_HS));
+				msg->flags &= ~I2C_M_TEN;
+
+				return I2C_OK;
+			}
+
+			if (msg->len == 0) {
+				if (msg->flags & I2C_M_STOP) {
+					_sercom_i2c_send_stop(hw);
+				}
+
+				msg->flags &= ~I2C_M_BUSY;
+			} else {
+				hri_sercomi2cm_write_DATA_reg(hw, *msg->buffer);
+				msg->buffer++;
+				msg->len--;
+			}
+
+			return I2C_OK;
+		}
+	} else if (flags & SB_FLAG) {
+		if ((msg->len) && !(status & SERCOM_I2CM_STATUS_RXNACK)) {
+			msg->len--;
+
+			/* last byte, send nack */
+			if ((msg->len == 0 && !sclsm) || (msg->len == 1 && sclsm)) {
+				hri_sercomi2cm_set_CTRLB_ACKACT_bit(hw);
+			}
+
+			if (msg->len == 0) {
+				if (msg->flags & I2C_M_STOP) {
+					hri_sercomi2cm_clear_CTRLB_SMEN_bit(hw);
+					_sercom_i2c_send_stop(hw);
+				}
+
+				msg->flags &= ~I2C_M_BUSY;
+			}
+
+			/* Accessing DATA.DATA auto-triggers I2C bus operations.
+			 * The operation performed depends on the state of
+			 * CTRLB.ACKACT, CTRLB.SMEN
+			 **/
+			*msg->buffer++ = hri_sercomi2cm_read_DATA_reg(hw);
+		} else {
+			hri_sercomi2cm_clear_interrupt_SB_bit(hw);
+			return I2C_NACK;
+		}
+
+		hri_sercomi2cm_clear_interrupt_SB_bit(hw);
+	}
+
+	return I2C_OK;
+}
+
+/**
+ * \brief Enable the i2c master module
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ */
+int32_t _i2c_m_async_enable(struct _i2c_m_async_device *const i2c_dev)
+{
+	ASSERT(i2c_dev);
+
+	_i2c_m_enable_implementation(i2c_dev->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Disable the i2c master module
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ */
+int32_t _i2c_m_async_disable(struct _i2c_m_async_device *const i2c_dev)
+{
+	void *hw = i2c_dev->hw;
+
+	ASSERT(i2c_dev);
+	ASSERT(i2c_dev->hw);
+
+	NVIC_DisableIRQ((IRQn_Type)_sercom_get_irq_num(hw));
+	hri_sercomi2cm_clear_CTRLA_ENABLE_bit(hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Set baudrate of master
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ * \param[in] clkrate The clock rate of i2c master, in KHz
+ * \param[in] baudrate The baud rate desired for i2c master, in KHz
+ */
+int32_t _i2c_m_async_set_baudrate(struct _i2c_m_async_device *const i2c_dev, uint32_t clkrate, uint32_t baudrate)
+{
+	uint32_t tmp;
+	void *   hw = i2c_dev->hw;
+
+	if (hri_sercomi2cm_get_CTRLA_ENABLE_bit(hw)) {
+		return ERR_DENIED;
+	}
+
+	tmp     = _get_i2cm_index(hw);
+	clkrate = _i2cms[tmp].clk / 1000;
+
+	if (i2c_dev->service.mode == I2C_STANDARD_MODE) {
+		tmp = (uint32_t)((clkrate - 10 * baudrate - baudrate * clkrate * (i2c_dev->service.trise * 0.000000001))
+		                 / (2 * baudrate));
+		hri_sercomi2cm_write_BAUD_BAUD_bf(hw, tmp);
+	} else if (i2c_dev->service.mode == I2C_FASTMODE) {
+		tmp = (uint32_t)((clkrate - 10 * baudrate - baudrate * clkrate * (i2c_dev->service.trise * 0.000000001))
+		                 / (2 * baudrate));
+		hri_sercomi2cm_write_BAUD_BAUD_bf(hw, tmp);
+	} else if (i2c_dev->service.mode == I2C_HIGHSPEED_MODE) {
+		tmp = (clkrate - 2 * baudrate) / (2 * baudrate);
+		hri_sercomi2cm_write_BAUD_HSBAUD_bf(hw, tmp);
+	} else {
+		/* error baudrate */
+		return ERR_INVALID_ARG;
+	}
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Retrieve IRQ number for the given hardware instance
+ */
+static uint8_t _sercom_get_irq_num(const void *const hw)
+{
+	return SERCOM0_0_IRQn + (_sercom_get_hardware_index(hw) << 2);
+}
+
+/**
+ * \brief Initialize sercom i2c module to use in async mode
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ */
+int32_t _i2c_m_async_init(struct _i2c_m_async_device *const i2c_dev, void *const hw)
+{
+	int32_t init_status;
+
+	ASSERT(i2c_dev);
+
+	i2c_dev->hw = hw;
+
+	init_status = _i2c_m_sync_init_impl(&i2c_dev->service, hw);
+	if (init_status) {
+		return init_status;
+	}
+
+	_sercom_init_irq_param(hw, (void *)i2c_dev);
+	uint8_t irq = _sercom_get_irq_num(hw);
+	for (uint32_t i = 0; i < 4; i++) {
+		NVIC_DisableIRQ((IRQn_Type)irq);
+		NVIC_ClearPendingIRQ((IRQn_Type)irq);
+		NVIC_EnableIRQ((IRQn_Type)irq);
+		irq++;
+	}
+	return ERR_NONE;
+}
+
+/**
+ * \brief Deinitialize sercom i2c module
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ */
+int32_t _i2c_m_async_deinit(struct _i2c_m_async_device *const i2c_dev)
+{
+	ASSERT(i2c_dev);
+
+	hri_sercomi2cm_clear_CTRLA_ENABLE_bit(i2c_dev->hw);
+	hri_sercomi2cm_set_CTRLA_SWRST_bit(i2c_dev->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Transfer the slave address to bus, which will start the transfer
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ */
+static int32_t _sercom_i2c_send_address(struct _i2c_m_async_device *const i2c_dev)
+{
+	void *             hw    = i2c_dev->hw;
+	struct _i2c_m_msg *msg   = &i2c_dev->service.msg;
+	int                sclsm = hri_sercomi2cm_get_CTRLA_SCLSM_bit(hw);
+
+	ASSERT(i2c_dev);
+
+	if (msg->len == 1 && sclsm) {
+		hri_sercomi2cm_set_CTRLB_ACKACT_bit(hw);
+	} else {
+		hri_sercomi2cm_clear_CTRLB_ACKACT_bit(hw);
+	}
+
+	/* ten bit address */
+	if (msg->addr & I2C_M_TEN) {
+		if (msg->flags & I2C_M_RD) {
+			msg->flags |= I2C_M_TEN;
+		}
+
+		hri_sercomi2cm_write_ADDR_reg(hw,
+		                              ((msg->addr & TEN_ADDR_MASK) << 1) | SERCOM_I2CM_ADDR_TENBITEN
+		                                  | (hri_sercomi2cm_read_ADDR_reg(hw) & SERCOM_I2CM_ADDR_HS));
+	} else {
+		hri_sercomi2cm_write_ADDR_reg(hw,
+		                              ((msg->addr & SEVEN_ADDR_MASK) << 1) | (msg->flags & I2C_M_RD ? I2C_M_RD : 0x0)
+		                                  | (hri_sercomi2cm_read_ADDR_reg(hw) & SERCOM_I2CM_ADDR_HS));
+	}
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Transfer data specified by msg
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ * \param[in] msg The pointer to i2c message
+ *
+ * \return Transfer status.
+ * \retval 0 Transfer success
+ * \retval <0 Transfer fail, return the error code
+ */
+int32_t _i2c_m_async_transfer(struct _i2c_m_async_device *i2c_dev, struct _i2c_m_msg *msg)
+{
+	int ret;
+
+	ASSERT(i2c_dev);
+	ASSERT(i2c_dev->hw);
+	ASSERT(msg);
+
+	if (msg->len == 0) {
+		return ERR_NONE;
+	}
+
+	if (i2c_dev->service.msg.flags & I2C_M_BUSY) {
+		return ERR_BUSY;
+	}
+
+	msg->flags |= I2C_M_BUSY;
+	i2c_dev->service.msg = *msg;
+	hri_sercomi2cm_set_CTRLB_SMEN_bit(i2c_dev->hw);
+
+	ret = _sercom_i2c_send_address(i2c_dev);
+
+	if (ret) {
+		i2c_dev->service.msg.flags &= ~I2C_M_BUSY;
+
+		return ret;
+	}
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Set callback to be called in interrupt handler
+ *
+ * \param[in] i2c_dev The pointer to master i2c device
+ * \param[in] type The callback type
+ * \param[in] func The callback function pointer
+ */
+int32_t _i2c_m_async_register_callback(struct _i2c_m_async_device *const i2c_dev, enum _i2c_m_async_callback_type type,
+                                       FUNC_PTR func)
+{
+	switch (type) {
+	case I2C_M_ASYNC_DEVICE_ERROR:
+		i2c_dev->cb.error = (_i2c_error_cb_t)func;
+		break;
+	case I2C_M_ASYNC_DEVICE_TX_COMPLETE:
+		i2c_dev->cb.tx_complete = (_i2c_complete_cb_t)func;
+		break;
+	case I2C_M_ASYNC_DEVICE_RX_COMPLETE:
+		i2c_dev->cb.rx_complete = (_i2c_complete_cb_t)func;
+		break;
+	default:
+		/* error */
+		break;
+	}
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Set stop condition on I2C
+ *
+ * \param i2c_dev Pointer to master i2c device
+ *
+ * \return Operation status
+ * \retval I2C_OK Operation was successfull
+ */
+int32_t _i2c_m_async_send_stop(struct _i2c_m_async_device *const i2c_dev)
+{
+	void *hw = i2c_dev->hw;
+
+	_sercom_i2c_send_stop(hw);
+
+	return I2C_OK;
+}
+
+/**
+ * \brief Get number of bytes left in transfer buffer
+ *
+ * \param i2c_dev Pointer to i2c master device
+ *
+ * \return Bytes left in buffer
+ * \retval =>0 Bytes left in buffer
+ */
+int32_t _i2c_m_async_get_bytes_left(struct _i2c_m_async_device *const i2c_dev)
+{
+	if (i2c_dev->service.msg.flags & I2C_M_BUSY) {
+		return i2c_dev->service.msg.len;
+	}
+
+	return 0;
+}
+
+/**
+ * \brief Initialize sercom i2c module to use in sync mode
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ */
+int32_t _i2c_m_sync_init(struct _i2c_m_sync_device *const i2c_dev, void *const hw)
+{
+	ASSERT(i2c_dev);
+
+	i2c_dev->hw = hw;
+
+	return _i2c_m_sync_init_impl(&i2c_dev->service, hw);
+}
+
+/**
+ * \brief Deinitialize sercom i2c module
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ */
+int32_t _i2c_m_sync_deinit(struct _i2c_m_sync_device *const i2c_dev)
+{
+	ASSERT(i2c_dev);
+
+	hri_sercomi2cm_clear_CTRLA_ENABLE_bit(i2c_dev->hw);
+	hri_sercomi2cm_set_CTRLA_SWRST_bit(i2c_dev->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Enable the i2c master module
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ */
+int32_t _i2c_m_sync_enable(struct _i2c_m_sync_device *const i2c_dev)
+{
+	ASSERT(i2c_dev);
+
+	_i2c_m_enable_implementation(i2c_dev->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Disable the i2c master module
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ */
+int32_t _i2c_m_sync_disable(struct _i2c_m_sync_device *const i2c_dev)
+{
+	void *hw = i2c_dev->hw;
+
+	ASSERT(i2c_dev);
+	ASSERT(i2c_dev->hw);
+
+	hri_sercomi2cm_clear_CTRLA_ENABLE_bit(hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Set baudrate of master
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ * \param[in] clkrate The clock rate of i2c master, in KHz
+ * \param[in] baudrate The baud rate desired for i2c master, in KHz
+ */
+int32_t _i2c_m_sync_set_baudrate(struct _i2c_m_sync_device *const i2c_dev, uint32_t clkrate, uint32_t baudrate)
+{
+	uint32_t tmp;
+	void *   hw = i2c_dev->hw;
+
+	if (hri_sercomi2cm_get_CTRLA_ENABLE_bit(hw)) {
+		return ERR_DENIED;
+	}
+
+	tmp     = _get_i2cm_index(hw);
+	clkrate = _i2cms[tmp].clk / 1000;
+
+	if (i2c_dev->service.mode == I2C_STANDARD_MODE) {
+		tmp = (uint32_t)((clkrate - 10 * baudrate - baudrate * clkrate * (i2c_dev->service.trise * 0.000000001))
+		                 / (2 * baudrate));
+		hri_sercomi2cm_write_BAUD_BAUD_bf(hw, tmp);
+	} else if (i2c_dev->service.mode == I2C_FASTMODE) {
+		tmp = (uint32_t)((clkrate - 10 * baudrate - baudrate * clkrate * (i2c_dev->service.trise * 0.000000001))
+		                 / (2 * baudrate));
+		hri_sercomi2cm_write_BAUD_BAUD_bf(hw, tmp);
+	} else if (i2c_dev->service.mode == I2C_HIGHSPEED_MODE) {
+		tmp = (clkrate - 2 * baudrate) / (2 * baudrate);
+		hri_sercomi2cm_write_BAUD_HSBAUD_bf(hw, tmp);
+	} else {
+		/* error baudrate */
+		return ERR_INVALID_ARG;
+	}
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Enable/disable I2C master interrupt
+ */
+void _i2c_m_async_set_irq_state(struct _i2c_m_async_device *const device, const enum _i2c_m_async_callback_type type,
+                                const bool state)
+{
+	if (I2C_M_ASYNC_DEVICE_TX_COMPLETE == type || I2C_M_ASYNC_DEVICE_RX_COMPLETE == type) {
+		hri_sercomi2cm_write_INTEN_SB_bit(device->hw, state);
+		hri_sercomi2cm_write_INTEN_MB_bit(device->hw, state);
+	} else if (I2C_M_ASYNC_DEVICE_ERROR == type) {
+		hri_sercomi2cm_write_INTEN_ERROR_bit(device->hw, state);
+	}
+}
+
+/**
+ * \brief Wait for bus response
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ * \param[in] flags Store the hardware response
+ *
+ * \return Bus response status.
+ * \retval 0 Bus response status OK
+ * \retval <0 Bus response fail
+ */
+inline static int32_t _sercom_i2c_sync_wait_bus(struct _i2c_m_sync_device *const i2c_dev, uint32_t *flags)
+{
+	uint32_t timeout = 65535;
+	void *   hw      = i2c_dev->hw;
+
+	do {
+		*flags = hri_sercomi2cm_read_INTFLAG_reg(hw);
+
+		if (timeout-- == 0) {
+			return I2C_ERR_BUS;
+		}
+	} while (!(*flags & MB_FLAG) && !(*flags & SB_FLAG));
+
+	return I2C_OK;
+}
+
+/**
+ * \brief Send the slave address to bus, which will start the transfer
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ */
+static int32_t _sercom_i2c_sync_send_address(struct _i2c_m_sync_device *const i2c_dev)
+{
+	void *             hw    = i2c_dev->hw;
+	struct _i2c_m_msg *msg   = &i2c_dev->service.msg;
+	int                sclsm = hri_sercomi2cm_get_CTRLA_SCLSM_bit(hw);
+	uint32_t           flags;
+
+	ASSERT(i2c_dev);
+
+	if (msg->len == 1 && sclsm) {
+		hri_sercomi2cm_set_CTRLB_ACKACT_bit(hw);
+	} else {
+		hri_sercomi2cm_clear_CTRLB_ACKACT_bit(hw);
+	}
+
+	/* ten bit address */
+	if (msg->addr & I2C_M_TEN) {
+		if (msg->flags & I2C_M_RD) {
+			msg->flags |= I2C_M_TEN;
+		}
+
+		hri_sercomi2cm_write_ADDR_reg(hw,
+		                              ((msg->addr & TEN_ADDR_MASK) << 1) | SERCOM_I2CM_ADDR_TENBITEN
+		                                  | (hri_sercomi2cm_read_ADDR_reg(hw) & SERCOM_I2CM_ADDR_HS));
+	} else {
+		hri_sercomi2cm_write_ADDR_reg(hw,
+		                              ((msg->addr & SEVEN_ADDR_MASK) << 1) | (msg->flags & I2C_M_RD ? I2C_M_RD : 0x0)
+		                                  | (hri_sercomi2cm_read_ADDR_reg(hw) & SERCOM_I2CM_ADDR_HS));
+	}
+
+	_sercom_i2c_sync_wait_bus(i2c_dev, &flags);
+	return _sercom_i2c_sync_analyse_flags(hw, flags, msg);
+}
+
+/**
+ * \brief Transfer data specified by msg
+ *
+ * \param[in] i2c_dev The pointer to i2c device
+ * \param[in] msg The pointer to i2c message
+ *
+ * \return Transfer status.
+ * \retval 0 Transfer success
+ * \retval <0 Transfer fail or partial fail, return the error code
+ */
+int32_t _i2c_m_sync_transfer(struct _i2c_m_sync_device *const i2c_dev, struct _i2c_m_msg *msg)
+{
+	uint32_t flags;
+	int      ret;
+	void *   hw = i2c_dev->hw;
+
+	ASSERT(i2c_dev);
+	ASSERT(i2c_dev->hw);
+	ASSERT(msg);
+
+	if (i2c_dev->service.msg.flags & I2C_M_BUSY) {
+		return I2C_ERR_BUSY;
+	}
+
+	msg->flags |= I2C_M_BUSY;
+	i2c_dev->service.msg = *msg;
+	hri_sercomi2cm_set_CTRLB_SMEN_bit(hw);
+
+	ret = _sercom_i2c_sync_send_address(i2c_dev);
+
+	if (ret) {
+		i2c_dev->service.msg.flags &= ~I2C_M_BUSY;
+
+		return ret;
+	}
+
+	while (i2c_dev->service.msg.flags & I2C_M_BUSY) {
+		ret = _sercom_i2c_sync_wait_bus(i2c_dev, &flags);
+
+		if (ret) {
+			if (msg->flags & I2C_M_STOP) {
+				_sercom_i2c_send_stop(hw);
+			}
+
+			i2c_dev->service.msg.flags &= ~I2C_M_BUSY;
+
+			return ret;
+		}
+
+		ret = _sercom_i2c_sync_analyse_flags(hw, flags, &i2c_dev->service.msg);
+	}
+
+	return ret;
+}
+
+int32_t _i2c_m_sync_send_stop(struct _i2c_m_sync_device *const i2c_dev)
+{
+	void *hw = i2c_dev->hw;
+
+	_sercom_i2c_send_stop(hw);
+
+	return I2C_OK;
+}
+
+static inline void _i2c_m_enable_implementation(void *const hw)
+{
+	int timeout = 65535;
+
+	ASSERT(hw);
+
+	/* Enable interrupts */
+	hri_sercomi2cm_set_CTRLA_ENABLE_bit(hw);
+
+	while (hri_sercomi2cm_read_STATUS_BUSSTATE_bf(hw) != I2C_IDLE) {
+		timeout--;
+
+		if (timeout <= 0) {
+			hri_sercomi2cm_clear_STATUS_reg(hw, SERCOM_I2CM_STATUS_BUSSTATE(I2C_IDLE));
+		}
+	}
+}
+
+static int32_t _i2c_m_sync_init_impl(struct _i2c_m_service *const service, void *const hw)
+{
+	uint8_t i = _get_i2cm_index(hw);
+
+	if (!hri_sercomi2cm_is_syncing(hw, SERCOM_I2CM_SYNCBUSY_SWRST)) {
+		uint32_t mode = _i2cms[i].ctrl_a & SERCOM_I2CM_CTRLA_MODE_Msk;
+		if (hri_sercomi2cm_get_CTRLA_reg(hw, SERCOM_I2CM_CTRLA_ENABLE)) {
+			hri_sercomi2cm_clear_CTRLA_ENABLE_bit(hw);
+			hri_sercomi2cm_wait_for_sync(hw, SERCOM_I2CM_SYNCBUSY_ENABLE);
+		}
+		hri_sercomi2cm_write_CTRLA_reg(hw, SERCOM_I2CM_CTRLA_SWRST | mode);
+	}
+	hri_sercomi2cm_wait_for_sync(hw, SERCOM_I2CM_SYNCBUSY_SWRST);
+
+	hri_sercomi2cm_write_CTRLA_reg(hw, _i2cms[i].ctrl_a);
+	hri_sercomi2cm_write_CTRLB_reg(hw, _i2cms[i].ctrl_b);
+	hri_sercomi2cm_write_BAUD_reg(hw, _i2cms[i].baud);
+
+	service->mode = (_i2cms[i].ctrl_a & SERCOM_I2CM_CTRLA_SPEED_Msk) >> SERCOM_I2CM_CTRLA_SPEED_Pos;
+	hri_sercomi2cm_write_ADDR_HS_bit(hw, service->mode < I2C_HS ? 0 : 1);
+
+	service->trise = _i2cms[i].trise;
+
+	return ERR_NONE;
+}
+
+	/* SERCOM I2C slave */
+
+#ifndef CONF_SERCOM_0_I2CS_ENABLE
+#define CONF_SERCOM_0_I2CS_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_1_I2CS_ENABLE
+#define CONF_SERCOM_1_I2CS_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_2_I2CS_ENABLE
+#define CONF_SERCOM_2_I2CS_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_3_I2CS_ENABLE
+#define CONF_SERCOM_3_I2CS_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_4_I2CS_ENABLE
+#define CONF_SERCOM_4_I2CS_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_5_I2CS_ENABLE
+#define CONF_SERCOM_5_I2CS_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_6_I2CS_ENABLE
+#define CONF_SERCOM_6_I2CS_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_7_I2CS_ENABLE
+#define CONF_SERCOM_7_I2CS_ENABLE 0
+#endif
+
+/** Amount of SERCOM that is used as I2C Slave. */
+#define SERCOM_I2CS_AMOUNT                                                                                             \
+	(CONF_SERCOM_0_I2CS_ENABLE + CONF_SERCOM_1_I2CS_ENABLE + CONF_SERCOM_2_I2CS_ENABLE + CONF_SERCOM_3_I2CS_ENABLE     \
+	 + CONF_SERCOM_4_I2CS_ENABLE + CONF_SERCOM_5_I2CS_ENABLE + CONF_SERCOM_6_I2CS_ENABLE + CONF_SERCOM_7_I2CS_ENABLE)
+
+/**
+ * \brief Macro is used to fill I2C slave configuration structure based on
+ * its number
+ *
+ * \param[in] n The number of structures
+ */
+#define I2CS_CONFIGURATION(n)                                                                                          \
+	{                                                                                                                  \
+		n,                                                                                                             \
+		    SERCOM_I2CM_CTRLA_MODE_I2C_SLAVE | (CONF_SERCOM_##n##_I2CS_RUNSTDBY << SERCOM_I2CS_CTRLA_RUNSTDBY_Pos)     \
+		        | SERCOM_I2CS_CTRLA_SDAHOLD(CONF_SERCOM_##n##_I2CS_SDAHOLD)                                            \
+		        | (CONF_SERCOM_##n##_I2CS_SEXTTOEN << SERCOM_I2CS_CTRLA_SEXTTOEN_Pos)                                  \
+		        | (CONF_SERCOM_##n##_I2CS_SPEED << SERCOM_I2CS_CTRLA_SPEED_Pos)                                        \
+		        | (CONF_SERCOM_##n##_I2CS_SCLSM << SERCOM_I2CS_CTRLA_SCLSM_Pos)                                        \
+		        | (CONF_SERCOM_##n##_I2CS_LOWTOUT << SERCOM_I2CS_CTRLA_LOWTOUTEN_Pos),                                 \
+		    SERCOM_I2CS_CTRLB_SMEN | SERCOM_I2CS_CTRLB_AACKEN | SERCOM_I2CS_CTRLB_AMODE(CONF_SERCOM_##n##_I2CS_AMODE), \
+		    (CONF_SERCOM_##n##_I2CS_GENCEN << SERCOM_I2CS_ADDR_GENCEN_Pos)                                             \
+		        | SERCOM_I2CS_ADDR_ADDR(CONF_SERCOM_##n##_I2CS_ADDRESS)                                                \
+		        | (CONF_SERCOM_##n##_I2CS_TENBITEN << SERCOM_I2CS_ADDR_TENBITEN_Pos)                                   \
+		        | SERCOM_I2CS_ADDR_ADDRMASK(CONF_SERCOM_##n##_I2CS_ADDRESS_MASK)                                       \
+	}
+
+/**
+ * \brief Macro to check 10-bit addressing
+ */
+#define I2CS_7BIT_ADDRESSING_MASK 0x7F
+
+static int32_t     _i2c_s_init(void *const hw);
+static int8_t      _get_i2c_s_index(const void *const hw);
+static inline void _i2c_s_deinit(void *const hw);
+static int32_t     _i2c_s_set_address(void *const hw, const uint16_t address);
+
+/**
+ * \brief SERCOM I2C slave configuration type
+ */
+struct i2cs_configuration {
+	uint8_t                    number;
+	hri_sercomi2cs_ctrla_reg_t ctrl_a;
+	hri_sercomi2cs_ctrlb_reg_t ctrl_b;
+	hri_sercomi2cs_addr_reg_t  address;
+};
+
+#if SERCOM_I2CS_AMOUNT < 1
+/** Dummy array for compiling. */
+static struct i2cs_configuration _i2css[1] = {{0}};
+#else
+/**
+ * \brief Array of SERCOM I2C slave configurations
+ */
+static struct i2cs_configuration _i2css[] = {
+#if CONF_SERCOM_0_I2CS_ENABLE == 1
+    I2CS_CONFIGURATION(0),
+#endif
+#if CONF_SERCOM_1_I2CS_ENABLE == 1
+    I2CS_CONFIGURATION(1),
+#endif
+#if CONF_SERCOM_2_I2CS_ENABLE == 1
+    I2CS_CONFIGURATION(2),
+#endif
+#if CONF_SERCOM_3_I2CS_ENABLE == 1
+    I2CS_CONFIGURATION(3),
+#endif
+#if CONF_SERCOM_4_I2CS_ENABLE == 1
+    I2CS_CONFIGURATION(4),
+#endif
+#if CONF_SERCOM_5_I2CS_ENABLE == 1
+    I2CS_CONFIGURATION(5),
+#endif
+};
+#endif
+
+/**
+ * \brief Initialize synchronous I2C slave
+ */
+int32_t _i2c_s_sync_init(struct _i2c_s_sync_device *const device, void *const hw)
+{
+	int32_t status;
+
+	ASSERT(device);
+
+	status = _i2c_s_init(hw);
+	if (status) {
+		return status;
+	}
+	device->hw = hw;
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Initialize asynchronous I2C slave
+ */
+int32_t _i2c_s_async_init(struct _i2c_s_async_device *const device, void *const hw)
+{
+	int32_t init_status;
+
+	ASSERT(device);
+
+	init_status = _i2c_s_init(hw);
+	if (init_status) {
+		return init_status;
+	}
+
+	device->hw = hw;
+	_sercom_init_irq_param(hw, (void *)device);
+	uint8_t irq = _sercom_get_irq_num(hw);
+	for (uint32_t i = 0; i < 4; i++) {
+		NVIC_DisableIRQ((IRQn_Type)irq);
+		NVIC_ClearPendingIRQ((IRQn_Type)irq);
+		NVIC_EnableIRQ((IRQn_Type)irq);
+		irq++;
+	}
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Deinitialize synchronous I2C
+ */
+int32_t _i2c_s_sync_deinit(struct _i2c_s_sync_device *const device)
+{
+	_i2c_s_deinit(device->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Deinitialize asynchronous I2C
+ */
+int32_t _i2c_s_async_deinit(struct _i2c_s_async_device *const device)
+{
+	NVIC_DisableIRQ((IRQn_Type)_sercom_get_irq_num(device->hw));
+	_i2c_s_deinit(device->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Enable I2C module
+ */
+int32_t _i2c_s_sync_enable(struct _i2c_s_sync_device *const device)
+{
+	hri_sercomi2cs_set_CTRLA_ENABLE_bit(device->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Enable I2C module
+ */
+int32_t _i2c_s_async_enable(struct _i2c_s_async_device *const device)
+{
+	hri_sercomi2cs_set_CTRLA_ENABLE_bit(device->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Disable I2C module
+ */
+int32_t _i2c_s_sync_disable(struct _i2c_s_sync_device *const device)
+{
+	hri_sercomi2cs_clear_CTRLA_ENABLE_bit(device->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Disable I2C module
+ */
+int32_t _i2c_s_async_disable(struct _i2c_s_async_device *const device)
+{
+	hri_sercomi2cs_clear_CTRLA_ENABLE_bit(device->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Check if 10-bit addressing mode is on
+ */
+int32_t _i2c_s_sync_is_10bit_addressing_on(const struct _i2c_s_sync_device *const device)
+{
+	return hri_sercomi2cs_get_ADDR_TENBITEN_bit(device->hw);
+}
+
+/**
+ * \brief Check if 10-bit addressing mode is on
+ */
+int32_t _i2c_s_async_is_10bit_addressing_on(const struct _i2c_s_async_device *const device)
+{
+	return hri_sercomi2cs_get_ADDR_TENBITEN_bit(device->hw);
+}
+
+/**
+ * \brief Set I2C slave address
+ */
+int32_t _i2c_s_sync_set_address(struct _i2c_s_sync_device *const device, const uint16_t address)
+{
+	return _i2c_s_set_address(device->hw, address);
+}
+
+/**
+ * \brief Set I2C slave address
+ */
+int32_t _i2c_s_async_set_address(struct _i2c_s_async_device *const device, const uint16_t address)
+{
+	return _i2c_s_set_address(device->hw, address);
+}
+
+/**
+ * \brief Write a byte to the given I2C instance
+ */
+void _i2c_s_sync_write_byte(struct _i2c_s_sync_device *const device, const uint8_t data)
+{
+	hri_sercomi2cs_write_DATA_reg(device->hw, data);
+}
+
+/**
+ * \brief Write a byte to the given I2C instance
+ */
+void _i2c_s_async_write_byte(struct _i2c_s_async_device *const device, const uint8_t data)
+{
+	hri_sercomi2cs_write_DATA_reg(device->hw, data);
+}
+
+/**
+ * \brief Read a byte from the given I2C instance
+ */
+uint8_t _i2c_s_sync_read_byte(const struct _i2c_s_sync_device *const device)
+{
+	return hri_sercomi2cs_read_DATA_reg(device->hw);
+}
+
+/**
+ * \brief Check if I2C is ready to send next byt
+ */
+bool _i2c_s_sync_is_byte_sent(const struct _i2c_s_sync_device *const device)
+{
+	return hri_sercomi2cs_get_interrupt_DRDY_bit(device->hw);
+}
+
+/**
+ * \brief Check if there is data received by I2C
+ */
+bool _i2c_s_sync_is_byte_received(const struct _i2c_s_sync_device *const device)
+{
+	return hri_sercomi2cs_get_interrupt_DRDY_bit(device->hw);
+}
+
+/**
+ * \brief Retrieve I2C slave status
+ */
+i2c_s_status_t _i2c_s_sync_get_status(const struct _i2c_s_sync_device *const device)
+{
+	return hri_sercomi2cs_read_STATUS_reg(device->hw);
+}
+
+/**
+ * \brief Clear the Data Ready interrupt flag
+ */
+int32_t _i2c_s_sync_clear_data_ready_flag(const struct _i2c_s_sync_device *const device)
+{
+	hri_sercomi2cs_clear_INTFLAG_DRDY_bit(device->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Retrieve I2C slave status
+ */
+i2c_s_status_t _i2c_s_async_get_status(const struct _i2c_s_async_device *const device)
+{
+	return hri_sercomi2cs_read_STATUS_reg(device->hw);
+}
+
+/**
+ * \brief Abort data transmission
+ */
+int32_t _i2c_s_async_abort_transmission(const struct _i2c_s_async_device *const device)
+{
+	hri_sercomi2cs_clear_INTEN_DRDY_bit(device->hw);
+
+	return ERR_NONE;
+}
+
+/**
+ * \brief Enable/disable I2C slave interrupt
+ */
+int32_t _i2c_s_async_set_irq_state(struct _i2c_s_async_device *const device, const enum _i2c_s_async_callback_type type,
+                                   const bool state)
+{
+	ASSERT(device);
+
+	if (I2C_S_DEVICE_TX == type || I2C_S_DEVICE_RX_COMPLETE == type) {
+		hri_sercomi2cs_write_INTEN_DRDY_bit(device->hw, state);
+	} else if (I2C_S_DEVICE_ERROR == type) {
+		hri_sercomi2cs_write_INTEN_ERROR_bit(device->hw, state);
+	}
+
+	return ERR_NONE;
+}
+
+/**
+ * \internal Initalize i2c slave hardware
+ *
+ * \param[in] p The pointer to hardware instance
+ *
+ *\ return status of initialization
+ */
+static int32_t _i2c_s_init(void *const hw)
+{
+	int8_t i = _get_i2c_s_index(hw);
+	if (i == -1) {
+		return ERR_INVALID_ARG;
+	}
+
+	if (!hri_sercomi2cs_is_syncing(hw, SERCOM_I2CS_CTRLA_SWRST)) {
+		uint32_t mode = _i2css[i].ctrl_a & SERCOM_I2CS_CTRLA_MODE_Msk;
+		if (hri_sercomi2cs_get_CTRLA_reg(hw, SERCOM_I2CS_CTRLA_ENABLE)) {
+			hri_sercomi2cs_clear_CTRLA_ENABLE_bit(hw);
+			hri_sercomi2cs_wait_for_sync(hw, SERCOM_I2CS_SYNCBUSY_ENABLE);
+		}
+		hri_sercomi2cs_write_CTRLA_reg(hw, SERCOM_I2CS_CTRLA_SWRST | mode);
+	}
+	hri_sercomi2cs_wait_for_sync(hw, SERCOM_I2CS_SYNCBUSY_SWRST);
+
+	hri_sercomi2cs_write_CTRLA_reg(hw, _i2css[i].ctrl_a);
+	hri_sercomi2cs_write_CTRLB_reg(hw, _i2css[i].ctrl_b);
+	hri_sercomi2cs_write_ADDR_reg(hw, _i2css[i].address);
+
+	return ERR_NONE;
+}
+
+/**
+ * \internal Retrieve ordinal number of the given sercom hardware instance
+ *
+ * \param[in] hw The pointer to hardware instance
+ *
+ * \return The ordinal number of the given sercom hardware instance
+ */
+static int8_t _get_i2c_s_index(const void *const hw)
+{
+	uint8_t sercom_offset = _sercom_get_hardware_index(hw);
+	uint8_t i;
+
+	for (i = 0; i < ARRAY_SIZE(_i2css); i++) {
+		if (_i2css[i].number == sercom_offset) {
+			return i;
+		}
+	}
+
+	ASSERT(false);
+	return -1;
+}
+
+/**
+ * \internal De-initialize i2c slave
+ *
+ * \param[in] hw The pointer to hardware instance
+ */
+static inline void _i2c_s_deinit(void *const hw)
+{
+	hri_sercomi2cs_clear_CTRLA_ENABLE_bit(hw);
+	hri_sercomi2cs_set_CTRLA_SWRST_bit(hw);
+}
+
+/**
+ * \internal De-initialize i2c slave
+ *
+ * \param[in] hw The pointer to hardware instance
+ * \param[in] address Address to set
+ */
+static int32_t _i2c_s_set_address(void *const hw, const uint16_t address)
+{
+	bool enabled;
+
+	enabled = hri_sercomi2cs_get_CTRLA_ENABLE_bit(hw);
+
+	CRITICAL_SECTION_ENTER()
+	hri_sercomi2cs_clear_CTRLA_ENABLE_bit(hw);
+	hri_sercomi2cs_write_ADDR_ADDR_bf(hw, address);
+	CRITICAL_SECTION_LEAVE()
+
+	if (enabled) {
+		hri_sercomi2cs_set_CTRLA_ENABLE_bit(hw);
+	}
+
+	return ERR_NONE;
+}
+
+	/* Sercom SPI implementation */
+
+#ifndef SERCOM_USART_CTRLA_MODE_SPI_SLAVE
+#define SERCOM_USART_CTRLA_MODE_SPI_SLAVE (2 << 2)
+#endif
+
+#define SPI_DEV_IRQ_MODE 0x8000
+
+#define _SPI_CS_PORT_EXTRACT(cs) (((cs) >> 0) & 0xFF)
+#define _SPI_CS_PIN_EXTRACT(cs) (((cs) >> 8) & 0xFF)
+
+COMPILER_PACK_SET(1)
+/** Initialization configuration of registers. */
+struct sercomspi_regs_cfg {
+	uint32_t ctrla;
+	uint32_t ctrlb;
+	uint32_t addr;
+	uint8_t  baud;
+	uint8_t  dbgctrl;
+	uint16_t dummy_byte;
+	uint8_t  n;
+};
+COMPILER_PACK_RESET()
+
+/** Build configuration from header macros. */
+#define SERCOMSPI_REGS(n)                                                                                              \
+	{                                                                                                                  \
+		(((CONF_SERCOM_##n##_SPI_DORD) << SERCOM_SPI_CTRLA_DORD_Pos)                                                   \
+		 | (CONF_SERCOM_##n##_SPI_CPOL << SERCOM_SPI_CTRLA_CPOL_Pos)                                                   \
+		 | (CONF_SERCOM_##n##_SPI_CPHA << SERCOM_SPI_CTRLA_CPHA_Pos)                                                   \
+		 | (CONF_SERCOM_##n##_SPI_AMODE_EN ? SERCOM_SPI_CTRLA_FORM(2) : SERCOM_SPI_CTRLA_FORM(0))                      \
+		 | SERCOM_SPI_CTRLA_DOPO(CONF_SERCOM_##n##_SPI_TXPO) | SERCOM_SPI_CTRLA_DIPO(CONF_SERCOM_##n##_SPI_RXPO)       \
+		 | (CONF_SERCOM_##n##_SPI_IBON << SERCOM_SPI_CTRLA_IBON_Pos)                                                   \
+		 | (CONF_SERCOM_##n##_SPI_RUNSTDBY << SERCOM_SPI_CTRLA_RUNSTDBY_Pos)                                           \
+		 | SERCOM_SPI_CTRLA_MODE(CONF_SERCOM_##n##_SPI_MODE)), /* ctrla */                                             \
+		    ((CONF_SERCOM_##n##_SPI_RXEN << SERCOM_SPI_CTRLB_RXEN_Pos)                                                 \
+		     | (CONF_SERCOM_##n##_SPI_MSSEN << SERCOM_SPI_CTRLB_MSSEN_Pos)                                             \
+		     | (CONF_SERCOM_##n##_SPI_SSDE << SERCOM_SPI_CTRLB_SSDE_Pos)                                               \
+		     | (CONF_SERCOM_##n##_SPI_PLOADEN << SERCOM_SPI_CTRLB_PLOADEN_Pos)                                         \
+		     | SERCOM_SPI_CTRLB_AMODE(CONF_SERCOM_##n##_SPI_AMODE)                                                     \
+		     | SERCOM_SPI_CTRLB_CHSIZE(CONF_SERCOM_##n##_SPI_CHSIZE)), /* ctrlb */                                     \
+		    (SERCOM_SPI_ADDR_ADDR(CONF_SERCOM_##n##_SPI_ADDR)                                                          \
+		     | SERCOM_SPI_ADDR_ADDRMASK(CONF_SERCOM_##n##_SPI_ADDRMASK)),      /* addr */                              \
+		    ((uint8_t)CONF_SERCOM_##n##_SPI_BAUD_RATE),                        /* baud */                              \
+		    (CONF_SERCOM_##n##_SPI_DBGSTOP << SERCOM_SPI_DBGCTRL_DBGSTOP_Pos), /* dbgctrl */                           \
+		    CONF_SERCOM_##n##_SPI_DUMMYBYTE,                                   /* Dummy byte for SPI master mode */    \
+		    n                                                                  /* sercom number */                     \
+	}
+
+#ifndef CONF_SERCOM_0_SPI_ENABLE
+#define CONF_SERCOM_0_SPI_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_1_SPI_ENABLE
+#define CONF_SERCOM_1_SPI_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_2_SPI_ENABLE
+#define CONF_SERCOM_2_SPI_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_3_SPI_ENABLE
+#define CONF_SERCOM_3_SPI_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_4_SPI_ENABLE
+#define CONF_SERCOM_4_SPI_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_5_SPI_ENABLE
+#define CONF_SERCOM_5_SPI_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_6_SPI_ENABLE
+#define CONF_SERCOM_6_SPI_ENABLE 0
+#endif
+#ifndef CONF_SERCOM_7_SPI_ENABLE
+#define CONF_SERCOM_7_SPI_ENABLE 0
+#endif
+
+/** Amount of SERCOM that is used as SPI */
+#define SERCOM_SPI_AMOUNT                                                                                              \
+	(CONF_SERCOM_0_SPI_ENABLE + CONF_SERCOM_1_SPI_ENABLE + CONF_SERCOM_2_SPI_ENABLE + CONF_SERCOM_3_SPI_ENABLE         \
+	 + CONF_SERCOM_4_SPI_ENABLE + CONF_SERCOM_5_SPI_ENABLE + CONF_SERCOM_6_SPI_ENABLE + CONF_SERCOM_7_SPI_ENABLE)
+
+#if SERCOM_SPI_AMOUNT < 1
+/** Dummy array for compiling. */
+static const struct sercomspi_regs_cfg sercomspi_regs[1] = {{0}};
+#else
+/** The SERCOM SPI configurations of SERCOM that is used as SPI. */
+static const struct sercomspi_regs_cfg sercomspi_regs[] = {
+#if CONF_SERCOM_0_SPI_ENABLE
+    SERCOMSPI_REGS(0),
+#endif
+#if CONF_SERCOM_1_SPI_ENABLE
+    SERCOMSPI_REGS(1),
+#endif
+#if CONF_SERCOM_2_SPI_ENABLE
+    SERCOMSPI_REGS(2),
+#endif
+#if CONF_SERCOM_3_SPI_ENABLE
+    SERCOMSPI_REGS(3),
+#endif
+#if CONF_SERCOM_4_SPI_ENABLE
+    SERCOMSPI_REGS(4),
+#endif
+#if CONF_SERCOM_5_SPI_ENABLE
+    SERCOMSPI_REGS(5),
+#endif
+#if CONF_SERCOM_6_SPI_ENABLE
+    SERCOMSPI_REGS(6),
+#endif
+#if CONF_SERCOM_7_SPI_ENABLE
+    SERCOMSPI_REGS(7),
+#endif
+};
+#endif
+
+/** \internal De-initialize SERCOM SPI
+ *
+ *  \param[in] hw Pointer to the hardware register base.
+ *
+ * \return De-initialization status
+ */
+static int32_t _spi_deinit(void *const hw)
+{
+	hri_sercomspi_clear_CTRLA_ENABLE_bit(hw);
+	hri_sercomspi_set_CTRLA_SWRST_bit(hw);
+
+	return ERR_NONE;
+}
+
+/** \internal Enable SERCOM SPI
+ *
+ *  \param[in] hw Pointer to the hardware register base.
+ *
+ * \return Enabling status
+ */
+static int32_t _spi_sync_enable(void *const hw)
+{
+	if (hri_sercomspi_is_syncing(hw, SERCOM_SPI_SYNCBUSY_SWRST)) {
+		return ERR_BUSY;
+	}
+
+	hri_sercomspi_set_CTRLA_ENABLE_bit(hw);
+
+	return ERR_NONE;
+}
+
+/** \internal Enable SERCOM SPI
+ *
+ *  \param[in] hw Pointer to the hardware register base.
+ *
+ * \return Enabling status
+ */
+static int32_t _spi_async_enable(void *const hw)
+{
+	_spi_sync_enable(hw);
+	uint8_t irq = _sercom_get_irq_num(hw);
+	for (uint32_t i = 0; i < 4; i++) {
+		NVIC_EnableIRQ((IRQn_Type)irq++);
+	}
+
+	return ERR_NONE;
+}
+
+/** \internal Disable SERCOM SPI
+ *
+ *  \param[in] hw Pointer to the hardware register base.
+ *
+ * \return Disabling status
+ */
+static int32_t _spi_sync_disable(void *const hw)
+{
+	if (hri_sercomspi_is_syncing(hw, SERCOM_SPI_SYNCBUSY_SWRST)) {
+		return ERR_BUSY;
+	}
+	hri_sercomspi_clear_CTRLA_ENABLE_bit(hw);
+
+	return ERR_NONE;
+}
+
+/** \internal Disable SERCOM SPI
+ *
+ *  \param[in] hw Pointer to the hardware register base.
+ *
+ * \return Disabling status
+ */
+static int32_t _spi_async_disable(void *const hw)
+{
+	_spi_sync_disable(hw);
+	hri_sercomspi_clear_INTEN_reg(
+	    hw, SERCOM_SPI_INTFLAG_ERROR | SERCOM_SPI_INTFLAG_RXC | SERCOM_SPI_INTFLAG_TXC | SERCOM_SPI_INTFLAG_DRE);
+	uint8_t irq = _sercom_get_irq_num(hw);
+	for (uint32_t i = 0; i < 4; i++) {
+		NVIC_DisableIRQ((IRQn_Type)irq++);
+	}
+
+	return ERR_NONE;
+}
+
+/** \internal Set SERCOM SPI mode
+ *
+ * \param[in] hw Pointer to the hardware register base.
+ * \param[in] mode The mode to set
+ *
+ * \return Setting mode status
+ */
+static int32_t _spi_set_mode(void *const hw, const enum spi_transfer_mode mode)
+{
+	uint32_t ctrla;
+
+	if (hri_sercomspi_is_syncing(hw, SERCOM_SPI_SYNCBUSY_SWRST | SERCOM_SPI_SYNCBUSY_ENABLE)) {
+		return ERR_BUSY;
+	}
+
+	ctrla = hri_sercomspi_read_CTRLA_reg(hw);
+	ctrla &= ~(SERCOM_SPI_CTRLA_CPOL | SERCOM_SPI_CTRLA_CPHA);
+	ctrla |= (mode & 0x3u) << SERCOM_SPI_CTRLA_CPHA_Pos;
+	hri_sercomspi_write_CTRLA_reg(hw, ctrla);
+
+	return ERR_NONE;
+}
+
+/** \internal Set SERCOM SPI baudrate
+ *
+ * \param[in] hw Pointer to the hardware register base.
+ * \param[in] baud_val The baudrate to set
+ *
+ * \return Setting baudrate status
+ */
+static int32_t _spi_set_baudrate(void *const hw, const uint32_t baud_val)
+{
+	if (hri_sercomspi_is_syncing(hw, SERCOM_SPI_SYNCBUSY_SWRST)) {
+		return ERR_BUSY;
+	}
+
+	hri_sercomspi_write_BAUD_reg(hw, baud_val);
+
+	return ERR_NONE;
+}
+
+/** \internal Set SERCOM SPI char size
+ *
+ * \param[in] hw Pointer to the hardware register base.
+ * \param[in] baud_val The baudrate to set
+ * \param[out] size Stored char size
+ *
+ * \return Setting char size status
+ */
+static int32_t _spi_set_char_size(void *const hw, const enum spi_char_size char_size, uint8_t *const size)
+{
+	/* Only 8-bit or 9-bit accepted */
+	if (!(char_size == SPI_CHAR_SIZE_8 || char_size == SPI_CHAR_SIZE_9)) {
+		return ERR_INVALID_ARG;
+	}
+
+	if (hri_sercomspi_is_syncing(hw, SERCOM_SPI_SYNCBUSY_SWRST | SERCOM_SPI_SYNCBUSY_CTRLB)) {
+		return ERR_BUSY;
+	}
+
+	hri_sercomspi_write_CTRLB_CHSIZE_bf(hw, char_size);
+	*size = (char_size == SPI_CHAR_SIZE_8) ? 1 : 2;
+
+	return ERR_NONE;
+}
+
+/** \internal Set SERCOM SPI data order
+ *
+ * \param[in] hw Pointer to the hardware register base.
+ * \param[in] baud_val The baudrate to set
+ *
+ * \return Setting data order status
+ */
+static int32_t _spi_set_data_order(void *const hw, const enum spi_data_order dord)
+{
+	uint32_t ctrla;
+
+	if (hri_sercomspi_is_syncing(hw, SERCOM_SPI_SYNCBUSY_SWRST)) {
+		return ERR_BUSY;
+	}
+
+	ctrla = hri_sercomspi_read_CTRLA_reg(hw);
+
+	if (dord == SPI_DATA_ORDER_LSB_1ST) {
+		ctrla |= SERCOM_SPI_CTRLA_DORD;
+	} else {
+		ctrla &= ~SERCOM_SPI_CTRLA_DORD;
+	}
+	hri_sercomspi_write_CTRLA_reg(hw, ctrla);
+
+	return ERR_NONE;
+}
+
+/** \brief Load SERCOM registers to init for SPI master mode
+ *  The settings will be applied with default master mode, unsupported things
+ *  are ignored.
+ *  \param[in, out] hw Pointer to the hardware register base.
+ *  \param[in] regs Pointer to register configuration values.
+ */
+static inline void _spi_load_regs_master(void *const hw, const struct sercomspi_regs_cfg *regs)
+{
+	ASSERT(hw && regs);
+	hri_sercomspi_write_CTRLA_reg(
+	    hw, regs->ctrla & ~(SERCOM_SPI_CTRLA_IBON | SERCOM_SPI_CTRLA_ENABLE | SERCOM_SPI_CTRLA_SWRST));
+	hri_sercomspi_write_CTRLB_reg(
+	    hw,
+	    (regs->ctrlb
+	     & ~(SERCOM_SPI_CTRLB_MSSEN | SERCOM_SPI_CTRLB_AMODE_Msk | SERCOM_SPI_CTRLB_SSDE | SERCOM_SPI_CTRLB_PLOADEN))
+	        | (SERCOM_SPI_CTRLB_RXEN));
+	hri_sercomspi_write_BAUD_reg(hw, regs->baud);
+	hri_sercomspi_write_DBGCTRL_reg(hw, regs->dbgctrl);
+}
+
+/** \brief Load SERCOM registers to init for SPI slave mode
+ *  The settings will be applied with default slave mode, unsupported things
+ *  are ignored.
+ *  \param[in, out] hw Pointer to the hardware register base.
+ *  \param[in] regs Pointer to register configuration values.
+ */
+static inline void _spi_load_regs_slave(void *const hw, const struct sercomspi_regs_cfg *regs)
+{
+	ASSERT(hw && regs);
+	hri_sercomspi_write_CTRLA_reg(
+	    hw, regs->ctrla & ~(SERCOM_SPI_CTRLA_IBON | SERCOM_SPI_CTRLA_ENABLE | SERCOM_SPI_CTRLA_SWRST));
+	hri_sercomspi_write_CTRLB_reg(hw,
+	                              (regs->ctrlb & ~(SERCOM_SPI_CTRLB_MSSEN))
+	                                  | (SERCOM_SPI_CTRLB_RXEN | SERCOM_SPI_CTRLB_SSDE | SERCOM_SPI_CTRLB_PLOADEN));
+	hri_sercomspi_write_ADDR_reg(hw, regs->addr);
+	hri_sercomspi_write_DBGCTRL_reg(hw, regs->dbgctrl);
+	while (hri_sercomspi_is_syncing(hw, 0xFFFFFFFF))
+		;
+}
+
+/** \brief Return the pointer to register settings of specific SERCOM
+ *  \param[in] hw_addr The hardware register base address.
+ *  \return Pointer to register settings of specific SERCOM.
+ */
+static inline const struct sercomspi_regs_cfg *_spi_get_regs(const uint32_t hw_addr)
+{
+	uint8_t n = _sercom_get_hardware_index((const void *)hw_addr);
+	uint8_t i;
+
+	for (i = 0; i < sizeof(sercomspi_regs) / sizeof(struct sercomspi_regs_cfg); i++) {
+		if (sercomspi_regs[i].n == n) {
+			return &sercomspi_regs[i];
+		}
+	}
+
+	return NULL;
+}
+
+int32_t _spi_m_sync_init(struct _spi_m_sync_dev *dev, void *const hw)
+{
+	const struct sercomspi_regs_cfg *regs = _spi_get_regs((uint32_t)hw);
+
+	ASSERT(dev && hw);
+
+	if (regs == NULL) {
+		return ERR_INVALID_ARG;
+	}
+
+	if (!hri_sercomspi_is_syncing(hw, SERCOM_SPI_SYNCBUSY_SWRST)) {
+		uint32_t mode = regs->ctrla & SERCOM_SPI_CTRLA_MODE_Msk;
+		if (hri_sercomspi_get_CTRLA_reg(hw, SERCOM_SPI_CTRLA_ENABLE)) {
+			hri_sercomspi_clear_CTRLA_ENABLE_bit(hw);
+			hri_sercomspi_wait_for_sync(hw, SERCOM_SPI_SYNCBUSY_ENABLE);
+		}
+		hri_sercomspi_write_CTRLA_reg(hw, SERCOM_SPI_CTRLA_SWRST | mode);
+	}
+	hri_sercomspi_wait_for_sync(hw, SERCOM_SPI_SYNCBUSY_SWRST);
+
+	dev->prvt = hw;
+
+	if ((regs->ctrla & SERCOM_SPI_CTRLA_MODE_Msk) == SERCOM_USART_CTRLA_MODE_SPI_SLAVE) {
+		_spi_load_regs_slave(hw, regs);
+	} else {
+		_spi_load_regs_master(hw, regs);
+	}
+
+	/* Load character size from default hardware configuration */
+	dev->char_size = ((regs->ctrlb & SERCOM_SPI_CTRLB_CHSIZE_Msk) == 0) ? 1 : 2;
+
+	dev->dummy_byte = regs->dummy_byte;
+
+	return ERR_NONE;
+}
+
+int32_t _spi_s_sync_init(struct _spi_s_sync_dev *dev, void *const hw)
+{
+	return _spi_m_sync_init(dev, hw);
+}
+
+int32_t _spi_m_async_init(struct _spi_async_dev *dev, void *const hw)
+{
+	struct _spi_async_dev *spid = dev;
+	/* Do hardware initialize. */
+	int32_t rc = _spi_m_sync_init((struct _spi_m_sync_dev *)dev, hw);
+
+	if (rc < 0) {
+		return rc;
+	}
+
+	_sercom_init_irq_param(hw, (void *)dev);
+	/* Initialize callbacks: must use them */
+	spid->callbacks.complete = NULL;
+	spid->callbacks.rx       = NULL;
+	spid->callbacks.tx       = NULL;
+	uint8_t irq              = _sercom_get_irq_num(hw);
+	for (uint32_t i = 0; i < 4; i++) {
+		NVIC_DisableIRQ((IRQn_Type)irq);
+		NVIC_ClearPendingIRQ((IRQn_Type)irq);
+		irq++;
+	}
+
+	return ERR_NONE;
+}
+
+int32_t _spi_s_async_init(struct _spi_s_async_dev *dev, void *const hw)
+{
+	return _spi_m_async_init(dev, hw);
+}
+
+int32_t _spi_m_async_deinit(struct _spi_async_dev *dev)
+{
+	NVIC_DisableIRQ((IRQn_Type)_sercom_get_irq_num(dev->prvt));
+	NVIC_ClearPendingIRQ((IRQn_Type)_sercom_get_irq_num(dev->prvt));
+
+	return _spi_deinit(dev->prvt);
+}
+
+int32_t _spi_s_async_deinit(struct _spi_s_async_dev *dev)
+{
+	NVIC_DisableIRQ((IRQn_Type)_sercom_get_irq_num(dev->prvt));
+	NVIC_ClearPendingIRQ((IRQn_Type)_sercom_get_irq_num(dev->prvt));
+
+	return _spi_deinit(dev->prvt);
+}
+
+int32_t _spi_m_sync_deinit(struct _spi_m_sync_dev *dev)
+{
+	return _spi_deinit(dev->prvt);
+}
+
+int32_t _spi_s_sync_deinit(struct _spi_s_sync_dev *dev)
+{
+	return _spi_deinit(dev->prvt);
+}
+
+int32_t _spi_m_sync_enable(struct _spi_m_sync_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_sync_enable(dev->prvt);
+}
+
+int32_t _spi_s_sync_enable(struct _spi_s_sync_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_sync_enable(dev->prvt);
+}
+
+int32_t _spi_m_async_enable(struct _spi_async_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_async_enable(dev->prvt);
+}
+
+int32_t _spi_s_async_enable(struct _spi_s_async_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_async_enable(dev->prvt);
+}
+
+int32_t _spi_m_sync_disable(struct _spi_m_sync_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_sync_disable(dev->prvt);
+}
+
+int32_t _spi_s_sync_disable(struct _spi_s_sync_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_sync_disable(dev->prvt);
+}
+
+int32_t _spi_m_async_disable(struct _spi_async_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_async_disable(dev->prvt);
+}
+
+int32_t _spi_s_async_disable(struct _spi_s_async_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_async_disable(dev->prvt);
+}
+
+int32_t _spi_m_sync_set_mode(struct _spi_m_sync_dev *dev, const enum spi_transfer_mode mode)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_mode(dev->prvt, mode);
+}
+
+int32_t _spi_m_async_set_mode(struct _spi_async_dev *dev, const enum spi_transfer_mode mode)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_mode(dev->prvt, mode);
+}
+
+int32_t _spi_s_async_set_mode(struct _spi_s_async_dev *dev, const enum spi_transfer_mode mode)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_mode(dev->prvt, mode);
+}
+
+int32_t _spi_s_sync_set_mode(struct _spi_s_sync_dev *dev, const enum spi_transfer_mode mode)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_mode(dev->prvt, mode);
+}
+
+int32_t _spi_calc_baud_val(struct spi_dev *dev, const uint32_t clk, const uint32_t baud)
+{
+	int32_t rc;
+	ASSERT(dev);
+
+	/* Not accept 0es */
+	if (clk == 0 || baud == 0) {
+		return ERR_INVALID_ARG;
+	}
+
+	/* Check baudrate range of current assigned clock */
+	if (!(baud <= (clk >> 1) && baud >= (clk >> 8))) {
+		return ERR_INVALID_ARG;
+	}
+
+	rc = ((clk >> 1) / baud) - 1;
+	return rc;
+}
+
+int32_t _spi_m_sync_set_baudrate(struct _spi_m_sync_dev *dev, const uint32_t baud_val)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_baudrate(dev->prvt, baud_val);
+}
+
+int32_t _spi_m_async_set_baudrate(struct _spi_async_dev *dev, const uint32_t baud_val)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_baudrate(dev->prvt, baud_val);
+}
+
+int32_t _spi_m_sync_set_char_size(struct _spi_m_sync_dev *dev, const enum spi_char_size char_size)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_char_size(dev->prvt, char_size, &dev->char_size);
+}
+
+int32_t _spi_m_async_set_char_size(struct _spi_async_dev *dev, const enum spi_char_size char_size)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_char_size(dev->prvt, char_size, &dev->char_size);
+}
+
+int32_t _spi_s_async_set_char_size(struct _spi_s_async_dev *dev, const enum spi_char_size char_size)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_char_size(dev->prvt, char_size, &dev->char_size);
+}
+
+int32_t _spi_s_sync_set_char_size(struct _spi_s_sync_dev *dev, const enum spi_char_size char_size)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_char_size(dev->prvt, char_size, &dev->char_size);
+}
+
+int32_t _spi_m_sync_set_data_order(struct _spi_m_sync_dev *dev, const enum spi_data_order dord)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_data_order(dev->prvt, dord);
+}
+
+int32_t _spi_m_async_set_data_order(struct _spi_async_dev *dev, const enum spi_data_order dord)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_data_order(dev->prvt, dord);
+}
+
+int32_t _spi_s_async_set_data_order(struct _spi_s_async_dev *dev, const enum spi_data_order dord)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_data_order(dev->prvt, dord);
+}
+
+int32_t _spi_s_sync_set_data_order(struct _spi_s_sync_dev *dev, const enum spi_data_order dord)
+{
+	ASSERT(dev && dev->prvt);
+
+	return _spi_set_data_order(dev->prvt, dord);
+}
+
+/** Wait until SPI bus idle. */
+static inline void _spi_wait_bus_idle(void *const hw)
+{
+	while (!(hri_sercomspi_get_INTFLAG_reg(hw, SERCOM_SPI_INTFLAG_TXC | SERCOM_SPI_INTFLAG_DRE))) {
+		;
+	}
+	hri_sercomspi_clear_INTFLAG_reg(hw, SERCOM_SPI_INTFLAG_TXC | SERCOM_SPI_INTFLAG_DRE);
+}
+
+/** Holds run time information for message sync transaction. */
+struct _spi_trans_ctrl {
+	/** Pointer to transmitting data buffer. */
+	uint8_t *txbuf;
+	/** Pointer to receiving data buffer. */
+	uint8_t *rxbuf;
+	/** Count number of data transmitted. */
+	uint32_t txcnt;
+	/** Count number of data received. */
+	uint32_t rxcnt;
+	/** Data character size. */
+	uint8_t char_size;
+};
+
+/** Check interrupt flag of RXC and update transaction runtime information. */
+static inline bool _spi_rx_check_and_receive(void *const hw, const uint32_t iflag, struct _spi_trans_ctrl *ctrl)
+{
+	uint32_t data;
+
+	if (!(iflag & SERCOM_SPI_INTFLAG_RXC)) {
+		return false;
+	}
+
+	data = hri_sercomspi_read_DATA_reg(hw);
+
+	if (ctrl->rxbuf) {
+		*ctrl->rxbuf++ = (uint8_t)data;
+
+		if (ctrl->char_size > 1) {
+			*ctrl->rxbuf++ = (uint8_t)(data >> 8);
+		}
+	}
+
+	ctrl->rxcnt++;
+
+	return true;
+}
+
+/** Check interrupt flag of DRE and update transaction runtime information. */
+static inline void _spi_tx_check_and_send(void *const hw, const uint32_t iflag, struct _spi_trans_ctrl *ctrl,
+                                          uint16_t dummy)
+{
+	uint32_t data;
+
+	if (!(SERCOM_SPI_INTFLAG_DRE & iflag)) {
+		return;
+	}
+
+	if (ctrl->txbuf) {
+		data = *ctrl->txbuf++;
+
+		if (ctrl->char_size > 1) {
+			data |= (*ctrl->txbuf) << 8;
+			ctrl->txbuf++;
+		}
+	} else {
+		data = dummy;
+	}
+
+	ctrl->txcnt++;
+	hri_sercomspi_write_DATA_reg(hw, data);
+}
+
+/** Check interrupt flag of ERROR and update transaction runtime information. */
+static inline int32_t _spi_err_check(const uint32_t iflag, void *const hw)
+{
+	if (SERCOM_SPI_INTFLAG_ERROR & iflag) {
+		hri_sercomspi_clear_STATUS_reg(hw, ~0);
+		hri_sercomspi_clear_INTFLAG_reg(hw, SERCOM_SPI_INTFLAG_ERROR);
+		return ERR_OVERFLOW;
+	}
+
+	return ERR_NONE;
+}
+
+int32_t _spi_m_sync_trans(struct _spi_m_sync_dev *dev, const struct spi_msg *msg)
+{
+	void *                 hw   = dev->prvt;
+	int32_t                rc   = 0;
+	struct _spi_trans_ctrl ctrl = {msg->txbuf, msg->rxbuf, 0, 0, dev->char_size};
+
+	ASSERT(dev && hw);
+
+	/* If settings are not applied (pending), we can not go on */
+	if (hri_sercomspi_is_syncing(
+	        hw, (SERCOM_SPI_SYNCBUSY_SWRST | SERCOM_SPI_SYNCBUSY_ENABLE | SERCOM_SPI_SYNCBUSY_CTRLB))) {
+		return ERR_BUSY;
+	}
+
+	/* SPI must be enabled to start synchronous transfer */
+	if (!hri_sercomspi_get_CTRLA_ENABLE_bit(hw)) {
+		return ERR_NOT_INITIALIZED;
+	}
+
+	for (;;) {
+		uint32_t iflag = hri_sercomspi_read_INTFLAG_reg(hw);
+
+		if (!_spi_rx_check_and_receive(hw, iflag, &ctrl)) {
+			/* In master mode, do not start next byte before previous byte received
+			 * to make better output waveform */
+			if (ctrl.rxcnt >= ctrl.txcnt) {
+				_spi_tx_check_and_send(hw, iflag, &ctrl, dev->dummy_byte);
+			}
+		}
+
+		rc = _spi_err_check(iflag, hw);
+
+		if (rc < 0) {
+			break;
+		}
+		if (ctrl.txcnt >= msg->size && ctrl.rxcnt >= msg->size) {
+			rc = ctrl.txcnt;
+			break;
+		}
+	}
+	/* Wait until SPI bus idle */
+	_spi_wait_bus_idle(hw);
+
+	return rc;
+}
+
+int32_t _spi_m_async_enable_tx(struct _spi_async_dev *dev, bool state)
+{
+	void *hw = dev->prvt;
+
+	ASSERT(dev && hw);
+
+	if (state) {
+		hri_sercomspi_set_INTEN_DRE_bit(hw);
+	} else {
+		hri_sercomspi_clear_INTEN_DRE_bit(hw);
+	}
+
+	return ERR_NONE;
+}
+
+int32_t _spi_s_async_enable_tx(struct _spi_s_async_dev *dev, bool state)
+{
+	return _spi_m_async_enable_tx(dev, state);
+}
+
+int32_t _spi_m_async_enable_rx(struct _spi_async_dev *dev, bool state)
+{
+	void *hw = dev->prvt;
+
+	ASSERT(dev);
+	ASSERT(hw);
+
+	if (state) {
+		hri_sercomspi_set_INTEN_RXC_bit(hw);
+	} else {
+		hri_sercomspi_clear_INTEN_RXC_bit(hw);
+	}
+
+	return ERR_NONE;
+}
+
+int32_t _spi_s_async_enable_rx(struct _spi_s_async_dev *dev, bool state)
+{
+	return _spi_m_async_enable_rx(dev, state);
+}
+
+int32_t _spi_m_async_enable_tx_complete(struct _spi_async_dev *dev, bool state)
+{
+	ASSERT(dev && dev->prvt);
+
+	if (state) {
+		hri_sercomspi_set_INTEN_TXC_bit(dev->prvt);
+	} else {
+		hri_sercomspi_clear_INTEN_TXC_bit(dev->prvt);
+	}
+
+	return ERR_NONE;
+}
+
+int32_t _spi_s_async_enable_ss_detect(struct _spi_s_async_dev *dev, bool state)
+{
+	return _spi_m_async_enable_tx_complete(dev, state);
+}
+
+int32_t _spi_m_async_write_one(struct _spi_async_dev *dev, uint16_t data)
+{
+	ASSERT(dev && dev->prvt);
+
+	hri_sercomspi_write_DATA_reg(dev->prvt, data);
+
+	return ERR_NONE;
+}
+
+int32_t _spi_s_async_write_one(struct _spi_s_async_dev *dev, uint16_t data)
+{
+	ASSERT(dev && dev->prvt);
+
+	hri_sercomspi_write_DATA_reg(dev->prvt, data);
+
+	return ERR_NONE;
+}
+
+int32_t _spi_s_sync_write_one(struct _spi_s_sync_dev *dev, uint16_t data)
+{
+	ASSERT(dev && dev->prvt);
+
+	hri_sercomspi_write_DATA_reg(dev->prvt, data);
+
+	return ERR_NONE;
+}
+
+uint16_t _spi_m_async_read_one(struct _spi_async_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return hri_sercomspi_read_DATA_reg(dev->prvt);
+}
+
+uint16_t _spi_s_async_read_one(struct _spi_s_async_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return hri_sercomspi_read_DATA_reg(dev->prvt);
+}
+
+uint16_t _spi_s_sync_read_one(struct _spi_s_sync_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return hri_sercomspi_read_DATA_reg(dev->prvt);
+}
+
+int32_t _spi_m_async_register_callback(struct _spi_async_dev *dev, const enum _spi_async_dev_cb_type cb_type,
+                                       const FUNC_PTR func)
+{
+	typedef void (*func_t)(void);
+	struct _spi_async_dev *spid = dev;
+
+	ASSERT(dev && (cb_type < SPI_DEV_CB_N));
+
+	func_t *p_ls  = (func_t *)&spid->callbacks;
+	p_ls[cb_type] = (func_t)func;
+
+	return ERR_NONE;
+}
+
+int32_t _spi_s_async_register_callback(struct _spi_s_async_dev *dev, const enum _spi_s_async_dev_cb_type cb_type,
+                                       const FUNC_PTR func)
+{
+	return _spi_m_async_register_callback(dev, cb_type, func);
+}
+
+bool _spi_s_sync_is_tx_ready(struct _spi_s_sync_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return hri_sercomi2cm_get_INTFLAG_reg(dev->prvt, SERCOM_SPI_INTFLAG_DRE);
+}
+
+bool _spi_s_sync_is_rx_ready(struct _spi_s_sync_dev *dev)
+{
+	ASSERT(dev && dev->prvt);
+
+	return hri_sercomi2cm_get_INTFLAG_reg(dev->prvt, SERCOM_SPI_INTFLAG_RXC);
+}
+
+bool _spi_s_sync_is_ss_deactivated(struct _spi_s_sync_dev *dev)
+{
+	void *hw = dev->prvt;
+
+	ASSERT(dev && hw);
+
+	if (hri_sercomi2cm_get_INTFLAG_reg(hw, SERCOM_SPI_INTFLAG_TXC)) {
+		hri_sercomspi_clear_INTFLAG_reg(hw, SERCOM_SPI_INTFLAG_TXC);
+		return true;
+	}
+	return false;
+}
+
+bool _spi_s_sync_is_error(struct _spi_s_sync_dev *dev)
+{
+	void *hw = dev->prvt;
+
+	ASSERT(dev && hw);
+
+	if (hri_sercomi2cm_get_INTFLAG_reg(hw, SERCOM_SPI_INTFLAG_ERROR)) {
+		hri_sercomspi_clear_STATUS_reg(hw, SERCOM_SPI_STATUS_BUFOVF);
+		hri_sercomspi_clear_INTFLAG_reg(hw, SERCOM_SPI_INTFLAG_ERROR);
+		return true;
+	}
+	return false;
+}
+
+/**
+ * \brief Enable/disable SPI master interrupt
+ *
+ * param[in] device The pointer to SPI master device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _spi_m_async_set_irq_state(struct _spi_async_dev *const device, const enum _spi_async_dev_cb_type type,
+                                const bool state)
+{
+	ASSERT(device);
+
+	if (SPI_DEV_CB_ERROR == type) {
+		hri_sercomspi_write_INTEN_ERROR_bit(device->prvt, state);
+	}
+}
+
+/**
+ * \brief Enable/disable SPI slave interrupt
+ *
+ * param[in] device The pointer to SPI slave device instance
+ * param[in] type The type of interrupt to disable/enable if applicable
+ * param[in] state Enable or disable
+ */
+void _spi_s_async_set_irq_state(struct _spi_async_dev *const device, const enum _spi_async_dev_cb_type type,
+                                const bool state)
+{
+	_spi_m_async_set_irq_state(device, type, state);
+}