diff --git a/sysmoOCTSIM/usb/device/usbdc.h b/sysmoOCTSIM/usb/device/usbdc.h
new file mode 100644
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--- /dev/null
+++ b/sysmoOCTSIM/usb/device/usbdc.h
@@ -0,0 +1,249 @@
+/**
+ * \file
+ *
+ * \brief USB Device Stack Core Layer Definition.
+ *
+ * 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 _USB_USBDC_H_
+#define _USB_USBDC_H_
+
+#include "usb_includes.h"
+#include "usb_protocol.h"
+#include "hal_usb_device.h"
+#include "usbd_config.h"
+
+/** USB device states. */
+enum usbd_state {
+	USBD_S_OFF     = 0,
+	USBD_S_POWER   = 1,
+	USBD_S_DEFAULT = 2,
+	USBD_S_ADDRESS = 3,
+	USBD_S_CONFIG  = 4,
+	USBD_S_SUSPEND = 0x10
+};
+
+/** USB device core handler type. */
+enum usbdc_handler_type { USBDC_HDL_SOF, USBDC_HDL_REQ, USBDC_HDL_CHANGE };
+
+/** USB device core change notification type. */
+enum usbdc_change_type {
+	/** Change of connection, detected by vbus. */
+	USBDC_C_CONN,
+	/** Change of state, by RESET, SetAddress(), SetConfig(). */
+	USBDC_C_STATE,
+	/** Change of power. */
+	USBDC_C_POWER,
+	/** Change of remote wakeup setting. */
+	USBDC_C_REMOTE_WAKEUP
+};
+
+/** Power change. */
+enum usbdc_power_type { USBDC_ACTIVE, USBDC_SLEEP, USBDC_SUSPEND };
+
+/** USB device general function control code. */
+enum usbdf_control {
+	/** Enable the function.
+	 *  int32_t ctrl(usbdf, USBDF_ENABLE, struct usbd_descriptors *desc);
+	 *  Parameter holds interface descriptor and
+	 *  configuration descriptor end position.
+	 */
+	USBDF_ENABLE,
+	/** Disable the function.
+	 *  int32_t ctrl(usbdf, USBDF_DISABLE, struct usbd_descriptors *desc);
+	 *  Parameter holds interface descriptor and
+	 *  configuration descriptor end position.
+	 *  Input NULL to force disable the function anyway.
+	 */
+	USBDF_DISABLE,
+	/** Get interface alternate setting.
+	 *  int32_t ctrl(usbdf, USBDF_GET_IFACE, struct usb_req *req);
+	 *  Parameter holds interface number who should return
+	 *  the alternate setting.
+	 */
+	USBDF_GET_IFACE
+};
+
+/** Describes a list of USB descriptors. */
+struct usbd_descriptors {
+	/** Pointer to Start of Descriptors. */
+	uint8_t *sod;
+	/** Pointer to End of Descriptors. */
+	uint8_t *eod;
+};
+
+/** Describes the USB device core descriptors. */
+struct usbdc_descriptors {
+	struct usbd_descriptors *ls_fs;
+#if CONF_USBD_HS_SP
+	struct usbd_descriptors *hs;
+#endif
+};
+
+/** Describes a list of core handler descriptor. */
+struct usbdc_handler {
+	/** Pointer to next handler. */
+	struct usbdc_handler *next;
+	/** Pointer to handler function. */
+	FUNC_PTR func;
+};
+
+/** Forward declaration for USB device function driver. */
+struct usbdf_driver;
+
+/** SOF handling function. */
+typedef void (*usbdc_sof_cb_t)(void);
+
+/** REQ handling function. */
+typedef int32_t (*usbdc_req_cb_t)(uint8_t ep, struct usb_req *req, enum usb_ctrl_stage stage);
+
+/** Change notification callback function. */
+typedef void (*usbdc_change_cb_t)(enum usbdc_change_type change, uint32_t value);
+
+/** Control function for USB device general function driver. */
+typedef int32_t (*usbdf_control_cb_t)(struct usbdf_driver *drv, enum usbdf_control ctrl, void *param);
+
+/** USB device general function driver descriptor. */
+struct usbdf_driver {
+	/** Pointer to next function.*/
+	struct usbdf_driver *next;
+	/** Pointer to control function.*/
+	usbdf_control_cb_t ctrl;
+	/** Pointer to function driver specific data. */
+	void *func_data;
+};
+
+/**
+ * \brief Register the handler
+ * \param[in] type USB device core handler type.
+ * \param[in] h Pointer to usb device core handler.
+ */
+void usbdc_register_handler(enum usbdc_handler_type type, const struct usbdc_handler *h);
+
+/**
+ * \brief Unregister the handler
+ * \param[in] type USB device core handler type.
+ * \param[in] h Pointer to usb device core handler.
+ */
+void usbdc_unregister_handler(enum usbdc_handler_type type, const struct usbdc_handler *h);
+
+/**
+ * \brief Initialize the USB device core driver
+ * \param[in] ctrl_buf Pointer to a buffer to be used by usb device ctrl endpoint
+ *  Note: the size of ctrl_buf should not be less than the size of EP0
+ * \return Operation status.
+ */
+int32_t usbdc_init(uint8_t *ctrl_buf);
+
+/**
+ * \brief Deinitialize the USB device core driver
+ * \return Operation status.
+ */
+int32_t usbdc_deinit(void);
+
+/**
+ * \brief Register function support of a USB device function
+ * \param[in] func Pointer to usb device function driver structure
+ */
+void usbdc_register_function(struct usbdf_driver *func);
+
+/**
+ * \brief Unregister function support of a USB device function
+ * \param[in] func Pointer to usb device function driver structure
+ */
+void usbdc_unregister_function(struct usbdf_driver *func);
+
+/**
+ * \brief Validate the descriptors
+ * \param[in] desces Pointer to usb device core descriptors
+ * \return Operation status.
+ */
+int32_t usbdc_validate_desces(struct usbd_descriptors *desces);
+
+/**
+ * \brief Issue USB device data transfer
+ * \param[in] ep endpointer address.
+ * \param[in] buf Pointer to data transfer buffer.
+ * \param[in] size the size of data transfer.
+ * \param[in] zlp flag to indicate zero length packet.
+ * \return Operation status.
+ */
+int32_t usbdc_xfer(uint8_t ep, uint8_t *buf, uint32_t size, bool zlp);
+
+/**
+ * \brief Start the USB device driver with specific descriptors set
+ * \param[in] desces Pointer to usb device core descriptors (FS/LS),
+ *                   or pointer to array of core descriptors (HS), the
+ *                   very first one includes device descriptor, FS/LS
+ *                   configuration descriptor, string descriptor, and
+ *                   may include device qualifier and other speed
+ *                   configuration descriptor; the second one includes
+ *                   high speed used descriptors.
+ *                   Note that string descriptor should be included in
+ *                   first place.
+ * \return Operation status.
+ */
+int32_t usbdc_start(struct usbd_descriptors *desces);
+
+/**
+ * \brief Stop the USB device driver
+ * \return Operation status.
+ */
+int32_t usbdc_stop(void);
+
+/**
+ * \brief Attach the USB device to host
+ */
+void usbdc_attach(void);
+
+/**
+ * \brief Detach the USB device from host
+ */
+void usbdc_detach(void);
+
+/**
+ * \brief Send remote wakeup to host
+ */
+void usbdc_remotewakeup(void);
+
+/**
+ * \brief Return USB device ctrl end pointer buffer start address
+ */
+uint8_t *usbdc_get_ctrl_buffer(void);
+
+/**
+ * \brief Return current USB state
+ */
+uint8_t usbdc_get_state(void);
+
+/**
+ * \brief Return version
+ */
+uint32_t usbdc_get_version(void);
+
+#endif /* USBDC_H_ */