diff --git a/meson.build b/meson.build
index 483ee0c4..1a8bb698 100644
--- a/meson.build
+++ b/meson.build
@@ -49,6 +49,7 @@ openrtx_inc = ['openrtx/include',
'platform/drivers/ADC',
'platform/drivers/NVM',
'platform/drivers/GPS',
+ 'platform/drivers/USB',
'platform/drivers/tones',
'platform/drivers/baseband',
'platform/drivers/backlight',
@@ -127,7 +128,9 @@ mdx_src = ['platform/drivers/ADC/ADC1_MDx.c',
'platform/drivers/audio/inputStream_MDx.cpp',
'platform/drivers/baseband/HR_Cx000.cpp',
'platform/drivers/backlight/backlight_MDx.c',
- 'platform/drivers/tones/toneGenerator_MDx.cpp']
+ 'platform/drivers/tones/toneGenerator_MDx.cpp',
+ 'platform/drivers/USB/usb_MDx.cpp',
+ 'platform/drivers/USB/usb_descriptors.c']
##
## GDx family: Radioddity GD-77 and Baofeng DM-1801
diff --git a/platform/drivers/USB/usb.h b/platform/drivers/USB/usb.h
new file mode 100644
index 00000000..fb3670fe
--- /dev/null
+++ b/platform/drivers/USB/usb.h
@@ -0,0 +1,45 @@
+/***************************************************************************
+ * Copyright (C) 2022 by Federico Amedeo Izzo IU2NUO, *
+ * Niccolò Izzo IU2KIN *
+ * Silvano Seva IU2KWO *
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation; either version 3 of the License, or *
+ * (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program; if not, see *
+ ***************************************************************************/
+
+#ifndef USB_H
+#define USB_H
+
+#include
+#include
+#include
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Initialise the USB driver.
+ */
+void usb_init();
+
+/**
+ * Shut down the USB driver.
+ */
+void usb_terminate();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* USB_H */
diff --git a/platform/drivers/USB/usb_MDx.cpp b/platform/drivers/USB/usb_MDx.cpp
new file mode 100644
index 00000000..2f47adf3
--- /dev/null
+++ b/platform/drivers/USB/usb_MDx.cpp
@@ -0,0 +1,66 @@
+/***************************************************************************
+ * Copyright (C) 2022 by Federico Amedeo Izzo IU2NUO, *
+ * Niccolò Izzo IU2KIN *
+ * Frederik Saraci IU2NRO *
+ * Silvano Seva IU2KWO *
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation; either version 3 of the License, or *
+ * (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program; if not, see *
+ ***************************************************************************/
+
+#include
+#include
+#include
+#include "usb.h"
+
+/*
+ * USB interrupt handler.
+ *
+
+void OTG_FS_IRQHandler(void)
+{
+ tud_int_handler(0);
+}
+*/
+
+void usb_init()
+{
+ gpio_setMode(GPIOA, 11, ALTERNATE);
+ gpio_setAlternateFunction(GPIOA, 11, 10);
+ gpio_setOutputSpeed(GPIOA, 11, HIGH); // 100MHz output speed
+
+ gpio_setMode(GPIOA, 12, ALTERNATE);
+ gpio_setAlternateFunction(GPIOA, 12, 10);
+ gpio_setOutputSpeed(GPIOA, 12, HIGH); // 100MHz output speed
+
+ RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
+ RCC->AHB2ENR |= RCC_AHB2ENR_OTGFSEN;
+ __DSB();
+
+ // Disable VBUS detection and activate the USB transceiver
+ USB_OTG_FS->GCCFG |= USB_OTG_GCCFG_NOVBUSSENS
+ | USB_OTG_GCCFG_PWRDWN;
+
+ // Force USB device mode
+ USB_OTG_FS->GUSBCFG |= USB_OTG_GUSBCFG_FDMOD;
+
+ NVIC_SetPriority(OTG_FS_IRQn, 14);
+
+ tusb_init();
+}
+
+void usb_terminate()
+{
+ RCC->AHB2ENR &= ~RCC_AHB2ENR_OTGFSEN;
+ __DSB();
+}
diff --git a/platform/drivers/USB/usb_descriptors.c b/platform/drivers/USB/usb_descriptors.c
new file mode 100644
index 00000000..a29fdab2
--- /dev/null
+++ b/platform/drivers/USB/usb_descriptors.c
@@ -0,0 +1,168 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#include
+#include "tusb.h"
+
+/* A combination of interfaces must have a unique product id, since PC will save device driver after the first plug.
+ * Same VID/PID with different interface e.g MSC (first), then CDC (later) will possibly cause system error on PC.
+ *
+ * Auto ProductID layout's Bitmap:
+ * [MSB] MIDI | HID | MSC | CDC [LSB]
+ */
+#define _PID_MAP(itf, n) ( (CFG_TUD_##itf) << (n) )
+#define USB_PID (0x4000 | _PID_MAP(CDC, 0) | _PID_MAP(MSC, 1) | _PID_MAP(HID, 2) | \
+ _PID_MAP(MIDI, 3) | _PID_MAP(VENDOR, 4) )
+
+#define USB_VID 0x0483 // ST Microelectronics
+
+//--------------------------------------------------------------------+
+// Device Descriptors
+//--------------------------------------------------------------------+
+tusb_desc_device_t const desc_device =
+{
+ .bLength = sizeof(tusb_desc_device_t),
+ .bDescriptorType = TUSB_DESC_DEVICE,
+ .bcdUSB = 0x0200,
+
+ .bDeviceClass = TUSB_CLASS_CDC,
+ .bDeviceSubClass = 0,
+ .bDeviceProtocol = 0,
+ .bMaxPacketSize0 = CFG_TUD_ENDPOINT0_SIZE,
+
+ .idVendor = USB_VID,
+ .idProduct = USB_PID,
+ .bcdDevice = 0x0100,
+
+ .iManufacturer = 0x01,
+ .iProduct = 0x02,
+ .iSerialNumber = 0x03,
+
+ .bNumConfigurations = 0x01
+};
+
+// Invoked when received GET DEVICE DESCRIPTOR
+// Application return pointer to descriptor
+uint8_t const * tud_descriptor_device_cb(void)
+{
+ return (uint8_t const *) &desc_device;
+}
+
+//--------------------------------------------------------------------+
+// Configuration Descriptor
+//--------------------------------------------------------------------+
+enum
+{
+ ITF_NUM_CDC_0 = 0,
+ ITF_NUM_CDC_0_DATA,
+ ITF_NUM_TOTAL
+};
+
+#define CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + CFG_TUD_CDC * TUD_CDC_DESC_LEN)
+
+#define EPNUM_CDC_0_NOTIF 0x81
+#define EPNUM_CDC_0_OUT 0x02
+#define EPNUM_CDC_0_IN 0x82
+
+#define EPNUM_CDC_1_NOTIF 0x83
+#define EPNUM_CDC_1_OUT 0x04
+#define EPNUM_CDC_1_IN 0x84
+
+uint8_t const desc_fs_configuration[] =
+{
+ // Config number, interface count, string index, total length, attribute,
+ // power in mA
+ TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),
+
+ // 1st CDC: Interface number, string index, EP notification address and
+ // size, EP data address (out, in) and size.
+ TUD_CDC_DESCRIPTOR(ITF_NUM_CDC_0, 4, EPNUM_CDC_0_NOTIF, 8,
+ EPNUM_CDC_0_OUT, EPNUM_CDC_0_IN, 64),
+};
+
+// Invoked when received GET CONFIGURATION DESCRIPTOR
+// Application return pointer to descriptor
+// Descriptor contents must exist long enough for transfer to complete
+uint8_t const * tud_descriptor_configuration_cb(uint8_t index)
+{
+ (void) index;
+ return desc_fs_configuration;
+}
+
+//--------------------------------------------------------------------+
+// String Descriptors
+//--------------------------------------------------------------------+
+
+// array of pointer to string descriptors
+static const char* string_desc_arr [] =
+{
+ (const char[]) { 0x09, 0x04 }, // 0: is supported language is English (0x0409)
+ "OpenRTX", // 1: Manufacturer
+ "", // 2: Product
+ "", // 3: Serials, should use chip ID
+ "OpenRTX CDC", // 4: CDC Interface
+};
+
+static uint16_t _desc_str[32];
+
+// Invoked when received GET STRING DESCRIPTOR request
+// Application return pointer to descriptor, whose contents must exist long
+// enough for transfer to complete
+uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid)
+{
+ (void) langid;
+
+ uint8_t chr_count;
+
+ if(index == 0)
+ {
+ memcpy(&_desc_str[1], string_desc_arr[0], 2);
+ chr_count = 1;
+ }
+ else
+ {
+ // Note: the 0xEE index string is a Microsoft OS 1.0 Descriptors.
+ // https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/microsoft-defined-usb-descriptors
+
+ if(!(index < sizeof(string_desc_arr)/sizeof(string_desc_arr[0]))) return NULL;
+
+ const char* str = string_desc_arr[index];
+
+ // Cap at max char
+ chr_count = strlen(str);
+ if(chr_count > 31) chr_count = 31;
+
+ // Convert ASCII string into UTF-16
+ for(uint8_t i=0; i