diff --git a/firmware/Makefile b/firmware/Makefile
index 13766e9..d7a5586 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -147,7 +147,7 @@
 C_LOWLEVEL = board_cstartup_gnu.o board_lowlevel.o syscalls.o exceptions.o
 C_LIBLEVEL = spi.o pio.o pmc.o usart.o pio_it.o pio_capture.o uart_console.o iso7816_4.o wdt.o led.o tc.o unique_id.o
 C_CCID = cciddriver.o USBD.o USBDDriver.o USBD_HAL.o USBRequests.o USBDCallbacks.o USBDescriptors.o USBDDriverCallbacks.o
-C_SIMTRACE = simtrace_iso7816.o usb.o ccid.o sniffer.o mitm.o ringbuffer.o host_communication.o iso7816_fidi.o tc_etu.o req_ctx.o card_emu.o mode_cardemu.o i2c.o
+C_SIMTRACE = simtrace_iso7816.o usb.o ccid.o sniffer.o mitm.o ringbuffer.o host_communication.o iso7816_fidi.o tc_etu.o req_ctx.o card_emu.o mode_cardemu.o i2c.o wwan_led.o
 C_APPLEVEL = main.o
 C_OBJECTS  = $(C_CMSIS) $(C_LOWLEVEL) $(C_LIBLEVEL) $(C_APPLEVEL) $(C_CCID) $(C_SIMTRACE)
 
diff --git a/firmware/include_board/qmod/board.h b/firmware/include_board/qmod/board.h
index 1360202..5b5c751 100644
--- a/firmware/include_board/qmod/board.h
+++ b/firmware/include_board/qmod/board.h
@@ -43,6 +43,11 @@
 
 #define PIN_PRTPWR_OVERRIDE	{PIO_PA8, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_DEFAULT}
 
+/* inputs reading the WWAN LED level */
+#define PIN_WWAN1		{PIO_PA15, PIOA, ID_PIOA, PIO_INPUT, PIO_PULLUP | PIO_DEGLITCH | PIO_IT_EDGE}
+#define PIN_WWAN2		{PIO_PA16, PIOA, ID_PIOA, PIO_INPUT, PIO_PULLUP | PIO_DEGLITCH | PIO_IT_EDGE}
+#define PINS_WWAN_IN		{ PIN_WWAN1, PIN_WWAN2 }
+
 #define SIMTRACE_VENDOR_ID          0x1d50
 #define SIMTRACE_PRODUCT_ID         0x60e3	/* FIXME */
 #define USB_VENDOR_ID               SIMTRACE_VENDOR_ID
diff --git a/firmware/src_simtrace/main.c b/firmware/src_simtrace/main.c
index c33cfea..412b1ce 100644
--- a/firmware/src_simtrace/main.c
+++ b/firmware/src_simtrace/main.c
@@ -7,6 +7,7 @@
 #include "simtrace.h"
 #include "utils.h"
 #include "req_ctx.h"
+#include "wwan_led.h"
 
 uint32_t g_unique_id[4];
 
@@ -278,6 +279,8 @@
 
 	PIO_InitializeInterrupts(0);
 
+	wwan_led_init();
+
 	EEFC_ReadUniqueID(g_unique_id);
 
         printf("\r\n\r\n"
diff --git a/firmware/src_simtrace/wwan_led.c b/firmware/src_simtrace/wwan_led.c
new file mode 100644
index 0000000..3bae0ff
--- /dev/null
+++ b/firmware/src_simtrace/wwan_led.c
@@ -0,0 +1,80 @@
+/* Code to read/track the status of the WWAN LEDs of attached modems
+ *
+ * Depending on the board this is running on,  it might be possible
+ * for the controller to read the status of the WWAN LED output lines of
+ * the cellular modem.  If the board supports this, it sets the
+ * PIN_WWAN1 and/or PIN_WWAN2 defines in its board.h file.
+ */
+
+#include "board.h"
+#include "wwan_led.h"
+
+#ifdef PIN_WWAN1
+static const Pin pin_wwan1 = PIN_WWAN1;
+
+static void wwan1_irqhandler(const Pin *pPin)
+{
+	int active = wwan_led_active(1);
+
+	TRACE_INFO("WWAN1 LED %u\r\n", active);
+
+	/* TODO: notify host via USB */
+}
+#endif
+
+#ifdef PIN_WWAN2
+static const Pin pin_wwan2 = PIN_WWAN2;
+
+static void wwan2_irqhandler(const Pin *pPin)
+{
+	int active = wwan_led_active(2);
+	TRACE_INFO("WWAN2 LED %u\r\n", active);
+
+	/* TODO: notify host via USB */
+}
+#endif
+
+/* determine if a tiven WWAN led is currently active or not */
+int wwan_led_active(int wwan)
+{
+	const Pin *pin;
+	int active;
+
+	switch (wwan) {
+#ifdef PIN_WWAN1
+	case 1:
+		pin = &pin_wwan1;
+		break;
+#endif
+#ifdef PIN_WWAN2
+	case 2:
+		pin = &pin_wwan2;
+		break;
+#endif
+	default:
+		return -1;
+	}
+
+	active = PIO_Get(&pin_wwan1) ? 0 : 1;
+	return active;
+}
+
+int wwan_led_init(void)
+{
+	int num_leds = 0;
+
+#ifdef PIN_WWAN1
+	PIO_Configure(&pin_wwan1, 1);
+	PIO_ConfigureIt(&pin_wwan1, wwan1_irqhandler);
+	PIO_EnableIt(&pin_wwan1);
+	num_leds++;
+#endif
+
+#ifdef PIN_WWAN2
+	PIO_Configure(&pin_wwan2, 1);
+	PIO_ConfigureIt(&pin_wwan2, wwan2_irqhandler);
+	PIO_EnableIt(&pin_wwan2);
+	num_leds++;
+#endif
+	return num_leds;
+}
diff --git a/firmware/src_simtrace/wwan_led.h b/firmware/src_simtrace/wwan_led.h
new file mode 100644
index 0000000..7ba72ea
--- /dev/null
+++ b/firmware/src_simtrace/wwan_led.h
@@ -0,0 +1,4 @@
+#pragma once
+
+int wwan_led_active(int wwan);
+int wwan_led_init(void);