[FL-1885] USB-UART bridge (#778)

* [FL-1885] USB-UART: app and worker
* [FL-1885] USB-UART: UART on CDC0

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

Makefile

@@ -1,6 +1,15 @@
 PROJECT_ROOT := $(abspath $(dir $(abspath $(firstword $(MAKEFILE_LIST)))))
 COPRO_DIR := $(PROJECT_ROOT)/lib/STM32CubeWB/Projects/STM32WB_Copro_Wireless_Binaries/STM32WB5x
 
+NPROCS := 1
+OS := $(shell uname -s)
+
+ifeq ($(OS), Linux)
+NPROCS := $(shell grep -c ^processor /proc/cpuinfo)
+else ifeq ($(OS), Darwin)
+NPROCS := $(shell sysctl -n hw.ncpu)
+endif
+
 .PHONY: all
 all: bootloader_all firmware_all
 
@@ -15,7 +24,7 @@ flash: bootloader_flash firmware_flash
 
 .PHONY: debug
 debug:
-	$(MAKE) -C firmware -j9 debug
+	$(MAKE) -C firmware -j$(NPROCS) debug
 
 .PHONY: wipe
 wipe:
@@ -24,29 +33,29 @@ wipe:
 
 .PHONY: bootloader_all
 bootloader_all:
-	$(MAKE) -C $(PROJECT_ROOT)/bootloader -j9 all
+	$(MAKE) -C $(PROJECT_ROOT)/bootloader -j$(NPROCS) all
 
 .PHONY: firmware_all
 firmware_all:
-	$(MAKE) -C $(PROJECT_ROOT)/firmware -j9 all
+	$(MAKE) -C $(PROJECT_ROOT)/firmware -j$(NPROCS) all
 
 .PHONY: bootloader_clean
 bootloader_clean:
-	$(MAKE) -C $(PROJECT_ROOT)/bootloader -j9 clean
+	$(MAKE) -C $(PROJECT_ROOT)/bootloader -j$(NPROCS) clean
 
 .PHONY: firmware_clean
 firmware_clean:
-	$(MAKE) -C $(PROJECT_ROOT)/firmware -j9 clean
+	$(MAKE) -C $(PROJECT_ROOT)/firmware -j$(NPROCS) clean
 
 .PHONY: bootloader_flash
 bootloader_flash:
 	rm $(PROJECT_ROOT)/bootloader/.obj/f*/flash || true
-	$(MAKE) -C $(PROJECT_ROOT)/bootloader -j9 flash
+	$(MAKE) -C $(PROJECT_ROOT)/bootloader -j$(NPROCS) flash
 
 .PHONY: firmware_flash
 firmware_flash:
 	rm $(PROJECT_ROOT)/firmware/.obj/f*/flash || true
-	$(MAKE) -C $(PROJECT_ROOT)/firmware -j9 flash
+	$(MAKE) -C $(PROJECT_ROOT)/firmware -j$(NPROCS) flash
 
 .PHONY: flash_radio
 flash_radio:

applications/debug_tools/bad_usb.c

@@ -248,6 +248,8 @@ static void badusb_worker(void* context) {
     evt.worker.state = WorkerStateDone;
     osMessageQueuePut(app->event_queue, &evt, 0, osWaitForever);
 
+    furi_hal_hid_kb_release_all();
+
     osThreadExit();
 }
 

applications/gpio/gpio_app.c

@@ -42,6 +42,9 @@ GpioApp* gpio_app_alloc() {
     view_dispatcher_add_view(
         app->view_dispatcher, GpioAppViewGpioTest, gpio_test_get_view(app->gpio_test));
 
+    view_dispatcher_add_view(
+        app->view_dispatcher, GpioAppViewUsbUart, variable_item_list_get_view(app->var_item_list));
+
     scene_manager_next_scene(app->scene_manager, GpioSceneStart);
 
     return app;
@@ -54,10 +57,13 @@ void gpio_app_free(GpioApp* app) {
     view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewVarItemList);
     variable_item_list_free(app->var_item_list);
     view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewGpioTest);
+    view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewUsbUart);
     gpio_test_free(app->gpio_test);
+
     // View dispatcher
     view_dispatcher_free(app->view_dispatcher);
     scene_manager_free(app->scene_manager);
+
     // Close records
     furi_record_close("gui");
     furi_record_close("notification");

applications/gpio/gpio_app_i.h

@@ -7,8 +7,8 @@
 #include <gui/gui.h>
 #include <gui/view_dispatcher.h>
 #include <gui/scene_manager.h>
+#include <gui/modules/submenu.h>
 #include <notification/notification-messages.h>
-
 #include <gui/modules/variable-item-list.h>
 #include "views/gpio_test.h"
 
@@ -25,4 +25,5 @@ struct GpioApp {
 typedef enum {
     GpioAppViewVarItemList,
     GpioAppViewGpioTest,
+    GpioAppViewUsbUart,
 } GpioAppView;

applications/gpio/scenes/gpio_scene_config.h

@@ -1,2 +1,3 @@
 ADD_SCENE(gpio, start, Start)
 ADD_SCENE(gpio, test, Test)
+ADD_SCENE(gpio, usb_uart, UsbUart)

applications/gpio/scenes/gpio_scene_start.c

@@ -4,10 +4,12 @@
 #define GPIO_SCENE_START_CUSTOM_EVENT_OTG_OFF (0UL)
 #define GPIO_SCENE_START_CUSTOM_EVENT_OTG_ON (1UL)
 #define GPIO_SCENE_START_CUSTOM_EVENT_TEST (2UL)
+#define GPIO_SCENE_START_CUSTOM_EVENT_USB_UART (3UL)
 
 enum GpioItem {
     GpioItemOtg,
     GpioItemTest,
+    GpioItemUsbUart,
 };
 
 enum GpioOtg {
@@ -27,6 +29,9 @@ static void gpio_scene_start_var_list_enter_callback(void* context, uint32_t ind
     if(index == GpioItemTest) {
         view_dispatcher_send_custom_event(
             app->view_dispatcher, GPIO_SCENE_START_CUSTOM_EVENT_TEST);
+    } else if(index == GpioItemUsbUart) {
+        view_dispatcher_send_custom_event(
+            app->view_dispatcher, GPIO_SCENE_START_CUSTOM_EVENT_USB_UART);
     }
 }
 
@@ -65,6 +70,7 @@ void gpio_scene_start_on_enter(void* context) {
         variable_item_set_current_value_text(item, gpio_otg_text[GpioOtgOff]);
     }
     variable_item_list_add(var_item_list, "GPIO tester", 0, NULL, NULL);
+    variable_item_list_add(var_item_list, "USB-UART bridge", 0, NULL, NULL);
 
     view_dispatcher_switch_to_view(app->view_dispatcher, GpioAppViewVarItemList);
 }
@@ -80,6 +86,8 @@ bool gpio_scene_start_on_event(void* context, SceneManagerEvent event) {
             furi_hal_power_disable_otg();
         } else if(event.event == GPIO_SCENE_START_CUSTOM_EVENT_TEST) {
             scene_manager_next_scene(app->scene_manager, GpioSceneTest);
+        } else if(event.event == GPIO_SCENE_START_CUSTOM_EVENT_USB_UART) {
+            scene_manager_next_scene(app->scene_manager, GpioSceneUsbUart);
         }
         consumed = true;
     }

applications/gpio/scenes/gpio_scene_usb_uart.c

@@ -0,0 +1,352 @@
+#include "../gpio_app_i.h"
+#include "furi-hal.h"
+#include <stream_buffer.h>
+#include <furi-hal-usb-cdc_i.h>
+#include "usb_cdc.h"
+
+#define USB_PKT_LEN CDC_DATA_SZ
+#define USB_UART_RX_BUF_SIZE (USB_PKT_LEN * 3)
+#define USB_UART_TX_BUF_SIZE (USB_PKT_LEN * 3)
+
+typedef enum {
+    WorkerCmdStop = (1 << 0),
+
+} WorkerCommandFlags;
+
+typedef enum {
+    UsbUartLineIndexVcp,
+    UsbUartLineIndexUart,
+    UsbUartLineIndexBaudrate,
+    UsbUartLineIndexEnable,
+    UsbUartLineIndexDisable,
+} LineIndex;
+
+typedef enum {
+    UsbUartPortUSART1 = 0,
+    UsbUartPortLPUART1 = 1,
+} PortIdx;
+
+typedef struct {
+    uint8_t vcp_ch;
+    PortIdx uart_ch;
+    uint32_t baudrate;
+} UsbUartConfig;
+
+typedef struct {
+    UsbUartConfig cfg_cur;
+    UsbUartConfig cfg_set;
+    char br_text[8];
+
+    bool running;
+    osThreadId_t parent_thread;
+
+    osThreadAttr_t thread_attr;
+    osThreadId_t thread;
+
+    osThreadAttr_t tx_thread_attr;
+    osThreadId_t tx_thread;
+
+    StreamBufferHandle_t rx_stream;
+    osSemaphoreId_t rx_done_sem;
+    osSemaphoreId_t usb_sof_sem;
+
+    StreamBufferHandle_t tx_stream;
+
+    uint8_t rx_buf[USB_PKT_LEN];
+    uint8_t tx_buf[USB_PKT_LEN];
+} UsbUartParams;
+
+static UsbUartParams* usb_uart;
+
+static const char* vcp_ch[] = {"0 (CLI)", "1"};
+static const char* uart_ch[] = {"USART1", "LPUART1"};
+static const char* baudrate_mode[] = {"Host"};
+static const uint32_t baudrate_list[] = {
+    2400,
+    9600,
+    19200,
+    38400,
+    57600,
+    115200,
+    230400,
+    460800,
+    921600,
+};
+
+static void vcp_on_cdc_tx_complete();
+static void vcp_on_cdc_rx();
+static void vcp_state_callback(uint8_t state);
+static void vcp_on_cdc_control_line(uint8_t state);
+static void vcp_on_line_config(struct usb_cdc_line_coding* config);
+
+static CdcCallbacks cdc_cb = {
+    vcp_on_cdc_tx_complete,
+    vcp_on_cdc_rx,
+    vcp_state_callback,
+    vcp_on_cdc_control_line,
+    vcp_on_line_config,
+};
+
+/* USB UART worker */
+
+static void usb_uart_tx_thread(void* context);
+
+static void usb_uart_on_irq_cb(UartIrqEvent ev, uint8_t data) {
+    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
+
+    if(ev == UartIrqEventRXNE) {
+        size_t ret =
+            xStreamBufferSendFromISR(usb_uart->rx_stream, &data, 1, &xHigherPriorityTaskWoken);
+        furi_check(ret == 1);
+        ret = xStreamBufferBytesAvailable(usb_uart->rx_stream);
+        if(ret > USB_PKT_LEN) osSemaphoreRelease(usb_uart->rx_done_sem);
+    } else if(ev == UartIrqEventIDLE) {
+        osSemaphoreRelease(usb_uart->rx_done_sem);
+    }
+
+    portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
+}
+
+static void usb_uart_worker(void* context) {
+    memcpy(&usb_uart->cfg_cur, &usb_uart->cfg_set, sizeof(UsbUartConfig));
+
+    usb_uart->rx_stream = xStreamBufferCreate(USB_UART_RX_BUF_SIZE, 1);
+    usb_uart->rx_done_sem = osSemaphoreNew(1, 1, NULL);
+    usb_uart->usb_sof_sem = osSemaphoreNew(1, 1, NULL);
+
+    usb_uart->tx_stream = xStreamBufferCreate(USB_UART_TX_BUF_SIZE, 1);
+
+    usb_uart->tx_thread = NULL;
+    usb_uart->tx_thread_attr.name = "usb_uart_tx";
+    usb_uart->tx_thread_attr.stack_size = 512;
+
+    UsbMode usb_mode_prev = furi_hal_usb_get_config();
+    if(usb_uart->cfg_cur.vcp_ch == 0) {
+        furi_hal_usb_set_config(UsbModeVcpSingle);
+        furi_hal_vcp_disable();
+    } else {
+        furi_hal_usb_set_config(UsbModeVcpDual);
+    }
+
+    if(usb_uart->cfg_cur.uart_ch == UsbUartPortUSART1) {
+        furi_hal_usart_init();
+        furi_hal_usart_set_irq_cb(usb_uart_on_irq_cb);
+        if(usb_uart->cfg_cur.baudrate != 0)
+            furi_hal_usart_set_br(usb_uart->cfg_cur.baudrate);
+        else
+            vcp_on_line_config(furi_hal_cdc_get_port_settings(usb_uart->cfg_cur.vcp_ch));
+    } else if(usb_uart->cfg_cur.uart_ch == UsbUartPortLPUART1) {
+        furi_hal_lpuart_init();
+        furi_hal_lpuart_set_irq_cb(usb_uart_on_irq_cb);
+        if(usb_uart->cfg_cur.baudrate != 0)
+            furi_hal_lpuart_set_br(usb_uart->cfg_cur.baudrate);
+        else
+            vcp_on_line_config(furi_hal_cdc_get_port_settings(usb_uart->cfg_cur.vcp_ch));
+    }
+
+    furi_hal_cdc_set_callbacks(usb_uart->cfg_cur.vcp_ch, &cdc_cb);
+    usb_uart->tx_thread = osThreadNew(usb_uart_tx_thread, NULL, &usb_uart->tx_thread_attr);
+
+    while(1) {
+        furi_check(osSemaphoreAcquire(usb_uart->rx_done_sem, osWaitForever) == osOK);
+        if(osThreadFlagsWait(WorkerCmdStop, osFlagsWaitAny, 0) == WorkerCmdStop) break;
+        size_t len = 0;
+        do {
+            len = xStreamBufferReceive(usb_uart->rx_stream, usb_uart->rx_buf, USB_PKT_LEN, 0);
+            if(len > 0) {
+                if(osSemaphoreAcquire(usb_uart->usb_sof_sem, 100) == osOK)
+                    furi_hal_cdc_send(usb_uart->cfg_cur.vcp_ch, usb_uart->rx_buf, len);
+                else
+                    xStreamBufferReset(usb_uart->rx_stream);
+            }
+        } while(len > 0);
+    }
+
+    osThreadTerminate(usb_uart->tx_thread);
+
+    if(usb_uart->cfg_cur.uart_ch == UsbUartPortUSART1)
+        furi_hal_usart_deinit();
+    else if(usb_uart->cfg_cur.uart_ch == UsbUartPortLPUART1)
+        furi_hal_lpuart_deinit();
+
+    furi_hal_cdc_set_callbacks(usb_uart->cfg_cur.vcp_ch, NULL);
+    furi_hal_usb_set_config(usb_mode_prev);
+    if(usb_uart->cfg_cur.vcp_ch == 0) furi_hal_vcp_enable();
+
+    vStreamBufferDelete(usb_uart->rx_stream);
+    osSemaphoreDelete(usb_uart->rx_done_sem);
+    osSemaphoreDelete(usb_uart->usb_sof_sem);
+
+    vStreamBufferDelete(usb_uart->tx_stream);
+    osThreadFlagsSet(usb_uart->parent_thread, WorkerCmdStop);
+    osThreadExit();
+}
+
+static void usb_uart_tx_thread(void* context) {
+    uint8_t data = 0;
+    while(1) {
+        size_t len = xStreamBufferReceive(usb_uart->tx_stream, &data, 1, osWaitForever);
+        if(len > 0) {
+            if(usb_uart->cfg_cur.uart_ch == UsbUartPortUSART1)
+                furi_hal_usart_tx(&data, len);
+            else if(usb_uart->cfg_cur.uart_ch == UsbUartPortLPUART1)
+                furi_hal_lpuart_tx(&data, len);
+        }
+    }
+    osThreadExit();
+}
+
+/* VCP callbacks */
+
+static void vcp_on_cdc_tx_complete() {
+    osSemaphoreRelease(usb_uart->usb_sof_sem);
+}
+
+static void vcp_on_cdc_rx() {
+    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
+
+    uint16_t max_len = xStreamBufferSpacesAvailable(usb_uart->tx_stream);
+    if(max_len > 0) {
+        if(max_len > USB_PKT_LEN) max_len = USB_PKT_LEN;
+        int32_t size = furi_hal_cdc_receive(usb_uart->cfg_cur.vcp_ch, usb_uart->tx_buf, max_len);
+
+        if(size > 0) {
+            size_t ret = xStreamBufferSendFromISR(
+                usb_uart->tx_stream, usb_uart->tx_buf, size, &xHigherPriorityTaskWoken);
+            furi_check(ret == size);
+        }
+    }
+    portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
+}
+
+static void vcp_state_callback(uint8_t state) {
+}
+
+static void vcp_on_cdc_control_line(uint8_t state) {
+}
+
+static void vcp_on_line_config(struct usb_cdc_line_coding* config) {
+    if((usb_uart->cfg_cur.baudrate == 0) && (config->dwDTERate != 0)) {
+        if(usb_uart->cfg_cur.uart_ch == UsbUartPortUSART1)
+            furi_hal_usart_set_br(config->dwDTERate);
+        else if(usb_uart->cfg_cur.uart_ch == UsbUartPortLPUART1)
+            furi_hal_lpuart_set_br(config->dwDTERate);
+    }
+}
+
+/* USB UART app */
+
+static void usb_uart_enable() {
+    if(usb_uart->running == false) {
+        usb_uart->thread = NULL;
+        usb_uart->thread_attr.name = "usb_uart";
+        usb_uart->thread_attr.stack_size = 1024;
+        usb_uart->parent_thread = osThreadGetId();
+        usb_uart->running = true;
+        usb_uart->thread = osThreadNew(usb_uart_worker, NULL, &usb_uart->thread_attr);
+    }
+}
+
+static void usb_uart_disable() {
+    if(usb_uart->running == true) {
+        osThreadFlagsSet(usb_uart->thread, WorkerCmdStop);
+        osSemaphoreRelease(usb_uart->rx_done_sem);
+        osThreadFlagsWait(WorkerCmdStop, osFlagsWaitAny, osWaitForever);
+        usb_uart->running = false;
+    }
+}
+
+bool gpio_scene_usb_uart_on_event(void* context, SceneManagerEvent event) {
+    //GpioApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == UsbUartLineIndexEnable) {
+            usb_uart_enable();
+        } else if(event.event == UsbUartLineIndexDisable) {
+            usb_uart_disable();
+        }
+        consumed = true;
+    }
+    return consumed;
+}
+
+/* Scene callbacks */
+
+static void line_vcp_cb(VariableItem* item) {
+    //GpioApp* app = variable_item_get_context(item);
+    uint8_t index = variable_item_get_current_value_index(item);
+
+    variable_item_set_current_value_text(item, vcp_ch[index]);
+
+    usb_uart->cfg_set.vcp_ch = index;
+}
+
+static void line_port_cb(VariableItem* item) {
+    //GpioApp* app = variable_item_get_context(item);
+    uint8_t index = variable_item_get_current_value_index(item);
+
+    variable_item_set_current_value_text(item, uart_ch[index]);
+
+    usb_uart->cfg_set.uart_ch = index;
+}
+
+static void line_baudrate_cb(VariableItem* item) {
+    //GpioApp* app = variable_item_get_context(item);
+    uint8_t index = variable_item_get_current_value_index(item);
+
+    if(index > 0) {
+        snprintf(usb_uart->br_text, 7, "%lu", baudrate_list[index - 1]);
+        variable_item_set_current_value_text(item, usb_uart->br_text);
+        usb_uart->cfg_set.baudrate = baudrate_list[index - 1];
+    } else {
+        variable_item_set_current_value_text(item, baudrate_mode[index]);
+        usb_uart->cfg_set.baudrate = 0;
+    }
+}
+
+static void gpio_scene_usb_uart_enter_callback(void* context, uint32_t index) {
+    furi_assert(context);
+    GpioApp* app = context;
+    view_dispatcher_send_custom_event(app->view_dispatcher, index);
+}
+
+void gpio_scene_usb_uart_on_enter(void* context) {
+    GpioApp* app = context;
+    VariableItemList* var_item_list = app->var_item_list;
+
+    usb_uart = furi_alloc(sizeof(UsbUartParams));
+
+    VariableItem* item;
+
+    variable_item_list_set_enter_callback(var_item_list, gpio_scene_usb_uart_enter_callback, app);
+
+    item = variable_item_list_add(var_item_list, "VCP Channel", 2, line_vcp_cb, app);
+    variable_item_set_current_value_index(item, 0);
+    variable_item_set_current_value_text(item, vcp_ch[0]);
+
+    item = variable_item_list_add(var_item_list, "UART Port", 2, line_port_cb, app);
+    variable_item_set_current_value_index(item, 0);
+    variable_item_set_current_value_text(item, uart_ch[0]);
+
+    item = variable_item_list_add(
+        var_item_list,
+        "Baudrate",
+        sizeof(baudrate_list) / sizeof(baudrate_list[0]) + 1,
+        line_baudrate_cb,
+        app);
+    variable_item_set_current_value_index(item, 0);
+    variable_item_set_current_value_text(item, baudrate_mode[0]);
+
+    item = variable_item_list_add(var_item_list, "Enable", 0, NULL, NULL);
+    item = variable_item_list_add(var_item_list, "Disable", 0, NULL, NULL);
+
+    view_dispatcher_switch_to_view(app->view_dispatcher, GpioAppViewUsbUart);
+}
+
+void gpio_scene_usb_uart_on_exit(void* context) {
+    GpioApp* app = context;
+    usb_uart_disable();
+    variable_item_list_clean(app->var_item_list);
+    free(usb_uart);
+}

applications/gui/modules/variable-item-list.c

@@ -259,7 +259,7 @@ void variable_item_list_clean(VariableItemList* variable_item_list) {
             VariableItemArray_it_t it;
             for(VariableItemArray_it(it, model->items); !VariableItemArray_end_p(it);
                 VariableItemArray_next(it)) {
-                string_clean(VariableItemArray_ref(it)->current_value_text);
+                string_clear(VariableItemArray_ref(it)->current_value_text);
             }
             VariableItemArray_clean(model->items);
             return false;

firmware/targets/f6/furi-hal/furi-hal-console.c

@@ -1,4 +1,5 @@
 #include <furi-hal-console.h>
+#include <furi-hal-lpuart.h>
 
 #include <stdbool.h>
 #include <stm32wbxx_ll_gpio.h>
@@ -7,8 +8,12 @@
 
 #include <furi.h>
 
+#define CONSOLE_BAUDRATE 230400
+
 volatile bool furi_hal_console_alive = false;
 
+static void (*irq_cb)(uint8_t ev, uint8_t data);
+
 void furi_hal_console_init() {
     LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
     GPIO_InitStruct.Pin = LL_GPIO_PIN_6|LL_GPIO_PIN_7;
@@ -21,11 +26,11 @@ void furi_hal_console_init() {
 
     LL_USART_InitTypeDef USART_InitStruct = {0};
     USART_InitStruct.PrescalerValue = LL_USART_PRESCALER_DIV1;
-    USART_InitStruct.BaudRate = 230400;
+    USART_InitStruct.BaudRate = CONSOLE_BAUDRATE;
     USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
     USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
     USART_InitStruct.Parity = LL_USART_PARITY_NONE;
-    USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX;
+    USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
     USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
     USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_16;
     LL_USART_Init(USART1, &USART_InitStruct);
@@ -36,12 +41,41 @@ void furi_hal_console_init() {
     LL_USART_Enable(USART1);
 
     while(!LL_USART_IsActiveFlag_TEACK(USART1)) ;
+
+    LL_USART_EnableIT_RXNE_RXFNE(USART1);
+    LL_USART_EnableIT_IDLE(USART1);
+    HAL_NVIC_SetPriority(USART1_IRQn, 5, 0);
+
     furi_hal_console_alive = true;
 
     FURI_LOG_I("FuriHalConsole", "Init OK");
 }
 
-static void furi_hal_console_uart_tx(const uint8_t* buffer, size_t buffer_size) {
+void furi_hal_usart_init() {
+    furi_hal_console_alive = false;
+}
+
+void furi_hal_usart_set_br(uint32_t baud) {
+    if (LL_USART_IsEnabled(USART1)) {
+        // Wait for transfer complete flag
+        while (!LL_USART_IsActiveFlag_TC(USART1));
+        LL_USART_Disable(USART1);
+        uint32_t uartclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART1_CLKSOURCE);
+        LL_USART_SetBaudRate(USART1, uartclk, LL_USART_PRESCALER_DIV1, LL_USART_OVERSAMPLING_16, baud);
+        LL_USART_Enable(USART1);
+    }
+}
+
+void furi_hal_usart_deinit() {
+    while (!LL_USART_IsActiveFlag_TC(USART1));
+    furi_hal_usart_set_br(CONSOLE_BAUDRATE);
+    furi_hal_console_alive = true;
+}
+
+void furi_hal_usart_tx(const uint8_t* buffer, size_t buffer_size) {
+    if (LL_USART_IsEnabled(USART1) == 0)
+        return;
+
     while(buffer_size > 0) {
         while (!LL_USART_IsActiveFlag_TXE(USART1));
 
@@ -52,12 +86,32 @@ static void furi_hal_console_uart_tx(const uint8_t* buffer, size_t buffer_size)
     }
 }
 
+void furi_hal_usart_set_irq_cb(void (*cb)(UartIrqEvent ev, uint8_t data)) {
+    irq_cb = cb;
+    if (irq_cb == NULL)
+        NVIC_DisableIRQ(USART1_IRQn);
+    else
+        NVIC_EnableIRQ(USART1_IRQn);
+}
+
+void USART1_IRQHandler(void) {
+    if (LL_USART_IsActiveFlag_RXNE_RXFNE(USART1)) {
+        uint8_t data = LL_USART_ReceiveData8(USART1);
+        irq_cb(UartIrqEventRXNE, data);
+    } else if (LL_USART_IsActiveFlag_IDLE(USART1)) {
+        irq_cb(UartIrqEventIDLE, 0);
+        LL_USART_ClearFlag_IDLE(USART1);
+    }
+
+    //TODO: more events
+}
+
 void furi_hal_console_tx(const uint8_t* buffer, size_t buffer_size) {
     if (!furi_hal_console_alive)
         return;
 
     // Transmit data
-    furi_hal_console_uart_tx(buffer, buffer_size);
+    furi_hal_usart_tx(buffer, buffer_size);
     // Wait for TC flag to be raised for last char
     while (!LL_USART_IsActiveFlag_TC(USART1));
 }
@@ -67,9 +121,9 @@ void furi_hal_console_tx_with_new_line(const uint8_t* buffer, size_t buffer_size
         return;
 
     // Transmit data
-    furi_hal_console_uart_tx(buffer, buffer_size);
+    furi_hal_usart_tx(buffer, buffer_size);
     // Transmit new line symbols
-    furi_hal_console_uart_tx((const uint8_t*)"\r\n", 2);
+    furi_hal_usart_tx((const uint8_t*)"\r\n", 2);
     // Wait for TC flag to be raised for last char
     while (!LL_USART_IsActiveFlag_TC(USART1));
 }

firmware/targets/f6/furi-hal/furi-hal-console.h

@@ -7,6 +7,12 @@
 extern "C" {
 #endif
 
+typedef enum {
+    UartIrqEventRXNE,
+    UartIrqEventIDLE,
+    //TODO: more events
+} UartIrqEvent;
+
 void furi_hal_console_init();
 
 void furi_hal_console_tx(const uint8_t* buffer, size_t buffer_size);
@@ -23,6 +29,18 @@ void furi_hal_console_printf(const char format[], ...);
 
 void furi_hal_console_puts(const char* data);
 
+
+void furi_hal_usart_init();
+
+void furi_hal_usart_deinit();
+
+void furi_hal_usart_set_br(uint32_t baud);
+
+void furi_hal_usart_tx(const uint8_t* buffer, size_t buffer_size);
+
+void furi_hal_usart_set_irq_cb(void (*cb)(UartIrqEvent ev, uint8_t data));
+
+
 #ifdef __cplusplus
 }
 #endif

firmware/targets/f6/furi-hal/furi-hal-lpuart.c

@@ -0,0 +1,105 @@
+#include <furi-hal-lpuart.h>
+#include <stdbool.h>
+#include <stm32wbxx_ll_gpio.h>
+#include <stm32wbxx_ll_lpuart.h>
+
+#include <furi.h>
+
+static void (*irq_cb)(uint8_t ev, uint8_t data);
+
+void furi_hal_lpuart_init() {
+    LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
+    GPIO_InitStruct.Pin = PC0_Pin|PC1_Pin;
+    GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
+    GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
+    GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
+    GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
+    GPIO_InitStruct.Alternate = LL_GPIO_AF_8;
+    LL_GPIO_Init(GPIOC, &GPIO_InitStruct);
+
+    LL_RCC_SetLPUARTClockSource(LL_RCC_LPUART1_CLKSOURCE_PCLK1);
+    LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_LPUART1);
+
+    LL_LPUART_InitTypeDef LPUART_InitStruct = {0};
+    LPUART_InitStruct.PrescalerValue = LL_LPUART_PRESCALER_DIV1;
+    LPUART_InitStruct.BaudRate = 115200;
+    LPUART_InitStruct.DataWidth = LL_LPUART_DATAWIDTH_8B;
+    LPUART_InitStruct.StopBits = LL_LPUART_STOPBITS_1;
+    LPUART_InitStruct.Parity = LL_LPUART_PARITY_NONE;
+    LPUART_InitStruct.TransferDirection = LL_LPUART_DIRECTION_TX_RX;
+    LPUART_InitStruct.HardwareFlowControl = LL_LPUART_HWCONTROL_NONE;
+    LL_LPUART_Init(LPUART1, &LPUART_InitStruct);
+    LL_LPUART_SetTXFIFOThreshold(LPUART1, LL_LPUART_FIFOTHRESHOLD_1_8);
+    LL_LPUART_SetRXFIFOThreshold(LPUART1, LL_LPUART_FIFOTHRESHOLD_1_8);
+    LL_LPUART_EnableFIFO(LPUART1);
+
+    LL_LPUART_Enable(LPUART1);
+
+    while((!(LL_LPUART_IsActiveFlag_TEACK(LPUART1))) || (!(LL_LPUART_IsActiveFlag_REACK(LPUART1))));
+
+    LL_LPUART_EnableIT_RXNE_RXFNE(LPUART1);
+    LL_LPUART_EnableIT_IDLE(LPUART1);
+    HAL_NVIC_SetPriority(LPUART1_IRQn, 5, 0);
+
+    FURI_LOG_I("FuriHalLpUart", "Init OK");
+}
+
+void furi_hal_lpuart_set_br(uint32_t baud) {
+    if (LL_LPUART_IsEnabled(LPUART1)) {
+        // Wait for transfer complete flag
+        while (!LL_LPUART_IsActiveFlag_TC(LPUART1));
+        LL_LPUART_Disable(LPUART1);
+        uint32_t uartclk = LL_RCC_GetLPUARTClockFreq(LL_RCC_GetLPUARTClockSource(LL_RCC_LPUART1_CLKSOURCE_PCLK1));
+        if (uartclk/baud > 4095) {
+            LL_LPUART_SetPrescaler(LPUART1, LL_LPUART_PRESCALER_DIV32);
+            LL_LPUART_SetBaudRate(LPUART1, uartclk, LL_LPUART_PRESCALER_DIV32, baud);
+        } else {
+            LL_LPUART_SetPrescaler(LPUART1, LL_LPUART_PRESCALER_DIV1);
+            LL_LPUART_SetBaudRate(LPUART1, uartclk, LL_LPUART_PRESCALER_DIV1, baud);
+        }
+        
+        LL_LPUART_Enable(LPUART1);
+    }
+}
+
+void furi_hal_lpuart_deinit() {
+    furi_hal_lpuart_set_irq_cb(NULL);
+    LL_GPIO_SetPinMode(GPIOC, PC0_Pin, LL_GPIO_MODE_ANALOG);
+    LL_GPIO_SetPinMode(GPIOC, PC1_Pin, LL_GPIO_MODE_ANALOG);
+    LL_LPUART_Disable(LPUART1);
+    LL_APB1_GRP2_DisableClock(LL_APB1_GRP2_PERIPH_LPUART1);
+}
+
+void furi_hal_lpuart_tx(const uint8_t* buffer, size_t buffer_size) {
+    if (LL_LPUART_IsEnabled(LPUART1) == 0)
+        return;
+
+    while(buffer_size > 0) {
+        while (!LL_LPUART_IsActiveFlag_TXE(LPUART1));
+
+        LL_LPUART_TransmitData8(LPUART1, *buffer);
+  
+        buffer++;
+        buffer_size--;
+    }
+}
+
+void furi_hal_lpuart_set_irq_cb(void (*cb)(UartIrqEvent ev, uint8_t data)) {
+    irq_cb = cb;
+    if (irq_cb == NULL)
+        NVIC_DisableIRQ(LPUART1_IRQn);
+    else
+        NVIC_EnableIRQ(LPUART1_IRQn);
+}
+
+void LPUART1_IRQHandler(void) {
+    if (LL_LPUART_IsActiveFlag_RXNE_RXFNE(LPUART1)) {
+        uint8_t data = LL_LPUART_ReceiveData8(LPUART1);
+        irq_cb(UartIrqEventRXNE, data);
+    } else if (LL_LPUART_IsActiveFlag_IDLE(LPUART1)) {
+        irq_cb(UartIrqEventIDLE, 0);
+        LL_LPUART_ClearFlag_IDLE(LPUART1);
+    }
+
+    //TODO: more events
+}

firmware/targets/f6/furi-hal/furi-hal-lpuart.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+#include "furi-hal-console.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+void furi_hal_lpuart_init();
+
+void furi_hal_lpuart_deinit();
+
+void furi_hal_lpuart_set_br(uint32_t baud);
+
+void furi_hal_lpuart_tx(const uint8_t* buffer, size_t buffer_size);
+
+void furi_hal_lpuart_set_irq_cb(void (*cb)(UartIrqEvent ev, uint8_t data));
+
+#ifdef __cplusplus
+}
+#endif

firmware/targets/f6/furi-hal/furi-hal-usb-cdc.c

@@ -1,6 +1,5 @@
 #include "furi-hal-version.h"
 #include "furi-hal-usb_i.h"
-#include "furi-hal-vcp_i.h"
 #include "furi-hal-usb-cdc_i.h"
 #include <furi.h>
 
@@ -17,6 +16,8 @@
 
 #define CDC_NTF_SZ      0x08
 
+#define IF_NUM_MAX 2
+
 struct CdcIadDescriptor {
     struct usb_iad_descriptor           comm_iad;
     struct usb_interface_descriptor     comm;
@@ -343,12 +344,8 @@ static const struct CdcConfigDescriptorDual cdc_cfg_desc_dual = {
     },
 };
 
-static struct usb_cdc_line_coding cdc_line = {
-    .dwDTERate          = 38400,
-    .bCharFormat        = USB_CDC_1_STOP_BITS,
-    .bParityType        = USB_CDC_NO_PARITY,
-    .bDataBits          = 8,
-};
+static struct usb_cdc_line_coding cdc_config[IF_NUM_MAX] = {};
+
 static void cdc_init(usbd_device* dev, struct UsbInterface* intf);
 static void cdc_deinit(usbd_device *dev);
 static void cdc_on_wakeup(usbd_device *dev);
@@ -358,6 +355,7 @@ static usbd_respond cdc_ep_config (usbd_device *dev, uint8_t cfg);
 static usbd_respond cdc_control (usbd_device *dev, usbd_ctlreq *req, usbd_rqc_callback *callback);
 static usbd_device* usb_dev;
 static struct UsbInterface* cdc_if_cur = NULL;
+static CdcCallbacks* callbacks[IF_NUM_MAX] = {NULL};
 
 struct UsbInterface usb_cdc_single = {
     .init = cdc_init,
@@ -429,6 +427,17 @@ static void cdc_deinit(usbd_device *dev) {
     cdc_if_cur = NULL;
 }
 
+void furi_hal_cdc_set_callbacks(uint8_t if_num, CdcCallbacks* cb) {
+    if (if_num < 2)
+        callbacks[if_num] = cb;
+}
+
+struct usb_cdc_line_coding* furi_hal_cdc_get_port_settings(uint8_t if_num) {
+    if (if_num < 2)
+        return &cdc_config[if_num];
+    return NULL;
+}
+
 void furi_hal_cdc_send(uint8_t if_num, uint8_t* buf, uint16_t len) {
     if (if_num == 0)
         usbd_ep_write(usb_dev, CDC0_TXD_EP, buf, len);
@@ -444,25 +453,47 @@ int32_t furi_hal_cdc_receive(uint8_t if_num, uint8_t* buf, uint16_t max_len) {
 }
 
 static void cdc_on_wakeup(usbd_device *dev) {
-    furi_hal_vcp_on_usb_resume();
+    for (uint8_t i = 0; i < IF_NUM_MAX; i++) {
+        if (callbacks[i] != NULL) {
+            if (callbacks[i]->state_callback != NULL)
+                callbacks[i]->state_callback(1);
+        }
+    }
 }
 
 static void cdc_on_suspend(usbd_device *dev) {
-    furi_hal_vcp_on_usb_suspend();
+    for (uint8_t i = 0; i < IF_NUM_MAX; i++) {
+        if (callbacks[i] != NULL) {
+            if (callbacks[i]->state_callback != NULL)
+                callbacks[i]->state_callback(0);
+        }
+    }
 }
 
 static void cdc_rx_ep_callback (usbd_device *dev, uint8_t event, uint8_t ep) {
+    uint8_t if_num = 0;
     if (ep == CDC0_RXD_EP)
-        furi_hal_vcp_on_cdc_rx(0);
+        if_num = 0;
     else
-        furi_hal_vcp_on_cdc_rx(1);
+        if_num = 1;
+    
+    if (callbacks[if_num] != NULL) {
+        if (callbacks[if_num]->rx_ep_callback != NULL)
+            callbacks[if_num]->rx_ep_callback();
+    }
 }
 
 static void cdc_tx_ep_callback (usbd_device *dev, uint8_t event, uint8_t ep) {
+    uint8_t if_num = 0;
     if (ep == CDC0_TXD_EP)
-        furi_hal_vcp_on_cdc_tx_complete(0);
+        if_num = 0;
     else
-        furi_hal_vcp_on_cdc_tx_complete(1);
+        if_num = 1;
+    
+    if (callbacks[if_num] != NULL) {
+        if (callbacks[if_num]->tx_ep_callback != NULL)
+            callbacks[if_num]->tx_ep_callback();
+    }
 }
 
 static void cdc_txrx_ep_callback (usbd_device *dev, uint8_t event, uint8_t ep) {
@@ -494,13 +525,15 @@ static usbd_respond cdc_ep_config (usbd_device *dev, uint8_t cfg) {
         return usbd_ack;
     case 1:
         /* configuring device */
-        if ((CDC0_TXD_EP & 0x7F) != (CDC0_RXD_EP & 0x7F)) {
+        if ((CDC0_TXD_EP & 0x7F) != (CDC0_RXD_EP & 0x7F)) { 
+            // 2x unidirectional endpoint mode with dualbuf
             usbd_ep_config(dev, CDC0_RXD_EP, USB_EPTYPE_BULK | USB_EPTYPE_DBLBUF, CDC_DATA_SZ);
             usbd_ep_config(dev, CDC0_TXD_EP, USB_EPTYPE_BULK | USB_EPTYPE_DBLBUF, CDC_DATA_SZ);
             usbd_ep_config(dev, CDC0_NTF_EP, USB_EPTYPE_INTERRUPT, CDC_NTF_SZ);
             usbd_reg_endpoint(dev, CDC0_RXD_EP, cdc_rx_ep_callback);
             usbd_reg_endpoint(dev, CDC0_TXD_EP, cdc_tx_ep_callback);
-        } else {
+        } else { 
+            // 1x bidirectional endpoint mode
             usbd_ep_config(dev, CDC0_RXD_EP, USB_EPTYPE_BULK, CDC_DATA_SZ);
             usbd_ep_config(dev, CDC0_TXD_EP, USB_EPTYPE_BULK, CDC_DATA_SZ);
             usbd_ep_config(dev, CDC0_NTF_EP, USB_EPTYPE_INTERRUPT, CDC_NTF_SZ);
@@ -532,20 +565,33 @@ static usbd_respond cdc_ep_config (usbd_device *dev, uint8_t cfg) {
 }
 
 /* Control requests handler */
-static usbd_respond cdc_control (usbd_device *dev, usbd_ctlreq *req, usbd_rqc_callback *callback) {
+static usbd_respond cdc_control(usbd_device* dev, usbd_ctlreq* req, usbd_rqc_callback* callback) {
     /* CDC control requests */
-    if (((USB_REQ_RECIPIENT | USB_REQ_TYPE) & req->bmRequestType) == (USB_REQ_INTERFACE | USB_REQ_CLASS)
-        && req->wIndex == 0 ) {
-        switch (req->bRequest) {
+    uint8_t if_num = 0;
+    if(((USB_REQ_RECIPIENT | USB_REQ_TYPE) & req->bmRequestType) == (USB_REQ_INTERFACE | USB_REQ_CLASS) 
+        && (req->wIndex == 0 || req->wIndex == 2)) {
+        if (req->wIndex == 0)
+            if_num = 0;
+        else
+            if_num = 1;
+
+        switch(req->bRequest) {
         case USB_CDC_SET_CONTROL_LINE_STATE:
-            furi_hal_vcp_on_cdc_control_line(req->wValue);
+            if (callbacks[if_num] != NULL) {
+                if (callbacks[if_num]->ctrl_line_callback != NULL)
+                    callbacks[if_num]->ctrl_line_callback(req->wValue);
+            }
             return usbd_ack;
         case USB_CDC_SET_LINE_CODING:
-            memcpy(&cdc_line, req->data, sizeof(cdc_line));
+            memcpy(&cdc_config[if_num], req->data, sizeof(cdc_config[0]));
+            if (callbacks[if_num] != NULL) {
+                if (callbacks[if_num]->config_callback != NULL)
+                    callbacks[if_num]->config_callback(&cdc_config[if_num]);
+            }
             return usbd_ack;
         case USB_CDC_GET_LINE_CODING:
-            dev->status.data_ptr = &cdc_line;
-            dev->status.data_count = sizeof(cdc_line);
+            dev->status.data_ptr = &cdc_config[if_num];
+            dev->status.data_count = sizeof(cdc_config[0]);
             return usbd_ack;
         default:
             return usbd_fail;

firmware/targets/f6/furi-hal/furi-hal-usb-cdc_i.h

@@ -1,6 +1,21 @@
 #pragma once
 
-#define CDC_DATA_SZ     0x40
+#include <stdint.h>
+#include "usb_cdc.h" 
+
+#define CDC_DATA_SZ 64
+
+typedef struct {
+    void (*tx_ep_callback)(void);
+    void (*rx_ep_callback)(void);
+    void (*state_callback)(uint8_t state);
+    void (*ctrl_line_callback)(uint8_t state);
+    void (*config_callback)(struct usb_cdc_line_coding* config);
+} CdcCallbacks;
+
+void furi_hal_cdc_set_callbacks(uint8_t if_num, CdcCallbacks* cb);
+
+struct usb_cdc_line_coding* furi_hal_cdc_get_port_settings(uint8_t if_num);
 
 void furi_hal_cdc_send(uint8_t if_num, uint8_t* buf, uint16_t len);
 

firmware/targets/f6/furi-hal/furi-hal-usb.c

@@ -1,7 +1,6 @@
 #include "furi-hal-version.h"
 #include "furi-hal-usb_i.h"
 #include "furi-hal-usb.h"
-#include "furi-hal-vcp_i.h"
 #include <furi.h>
 
 #include "usb.h"
@@ -34,6 +33,7 @@ struct UsbCfg{
     UsbMode mode_cur;
     UsbMode mode_next;
     bool enabled;
+    bool connected;
 } usb_config;
 
 static void furi_hal_usb_tmr_cb(void* context);
@@ -158,11 +158,15 @@ static usbd_respond usb_descriptor_get (usbd_ctlreq *req, void **address, uint16
 }
 
 static void susp_evt(usbd_device *dev, uint8_t event, uint8_t ep) {
-    if (usb_if_modes[usb_config.mode_cur] != NULL)
+    if ((usb_if_modes[usb_config.mode_cur] != NULL) && (usb_config.connected == true)) {
+        usb_config.connected = false;
         usb_if_modes[usb_config.mode_cur]->suspend(&udev);
+    }
 }
 
 static void wkup_evt(usbd_device *dev, uint8_t event, uint8_t ep) {
-    if (usb_if_modes[usb_config.mode_cur] != NULL)
+    if ((usb_if_modes[usb_config.mode_cur] != NULL) && (usb_config.connected == false)) {
+        usb_config.connected = true;
         usb_if_modes[usb_config.mode_cur]->wakeup(&udev);
+    } 
 }

firmware/targets/f6/furi-hal/furi-hal-vcp.c

@@ -1,4 +1,3 @@
-#include <furi-hal-vcp_i.h>
 #include <furi-hal-usb-cdc_i.h>
 
 #include <furi.h>
@@ -7,6 +6,7 @@
 #define APP_RX_DATA_SIZE CDC_DATA_SZ
 #define APP_TX_DATA_SIZE CDC_DATA_SZ
 #define FURI_HAL_VCP_RX_BUFFER_SIZE (APP_RX_DATA_SIZE * 16)
+#define VCP_IF_NUM 0
 
 typedef struct {
     volatile bool connected;
@@ -17,6 +17,19 @@ typedef struct {
     osSemaphoreId_t tx_semaphore;
 } FuriHalVcp;
 
+static void vcp_on_cdc_tx_complete();
+static void vcp_on_cdc_rx();
+static void vcp_state_callback(uint8_t state);
+static void vcp_on_cdc_control_line(uint8_t state);
+
+static CdcCallbacks cdc_cb = {
+    vcp_on_cdc_tx_complete,
+    vcp_on_cdc_rx,
+    vcp_state_callback,
+    vcp_on_cdc_control_line,
+    NULL,
+};
+
 static FuriHalVcp* furi_hal_vcp = NULL;
 
 static const uint8_t ascii_soh = 0x01;
@@ -34,9 +47,22 @@ void furi_hal_vcp_init() {
 
     furi_hal_vcp->tx_semaphore = osSemaphoreNew(1, 1, NULL);
 
+    furi_hal_cdc_set_callbacks(VCP_IF_NUM, &cdc_cb);
+
     FURI_LOG_I("FuriHalVcp", "Init OK");
 }
 
+void furi_hal_vcp_enable() {
+    furi_hal_cdc_set_callbacks(VCP_IF_NUM, &cdc_cb);
+    furi_hal_vcp->connected = true;
+}
+
+void furi_hal_vcp_disable() {
+    furi_hal_cdc_set_callbacks(VCP_IF_NUM, NULL);
+    furi_hal_vcp->connected = false;
+    osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
+}
+
 size_t furi_hal_vcp_rx(uint8_t* buffer, size_t size) {
     furi_assert(furi_hal_vcp);
 
@@ -68,24 +94,22 @@ void furi_hal_vcp_tx(const uint8_t* buffer, size_t size) {
             batch_size = APP_TX_DATA_SIZE;
         }
 
-        furi_hal_cdc_send(0, (uint8_t*)buffer, batch_size);
+        furi_hal_cdc_send(VCP_IF_NUM, (uint8_t*)buffer, batch_size);
         size -= batch_size;
         buffer += batch_size;
     }
 }
 
-void furi_hal_vcp_on_usb_resume() {
-    osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
-}
-
-void furi_hal_vcp_on_usb_suspend() {
-    if (furi_hal_vcp->connected) {
+static void vcp_state_callback(uint8_t state) {
+    if (state == 1)
+        osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
+    else if (furi_hal_vcp->connected) {
         furi_hal_vcp->connected = false;
         osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
     }
 }
 
-void furi_hal_vcp_on_cdc_control_line(uint8_t state) {
+static void vcp_on_cdc_control_line(uint8_t state) {
 
     BaseType_t xHigherPriorityTaskWoken = pdFALSE;
     // bit 0: DTR state, bit 1: RTS state
@@ -110,30 +134,26 @@ void furi_hal_vcp_on_cdc_control_line(uint8_t state) {
     portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
 }
 
-void furi_hal_vcp_on_cdc_rx(uint8_t if_num) { 
+static void vcp_on_cdc_rx() { 
     BaseType_t xHigherPriorityTaskWoken = pdFALSE;
 
-    if (if_num == 0) {
-        uint16_t max_len = xStreamBufferSpacesAvailable(furi_hal_vcp->rx_stream);
-        if (max_len > 0) {
-            if (max_len > APP_RX_DATA_SIZE)
-                max_len = APP_RX_DATA_SIZE;
-            int32_t size = furi_hal_cdc_receive(0, vcp_rx_buf, max_len);
-
-            if (size > 0) {
-                size_t ret = xStreamBufferSendFromISR(furi_hal_vcp->rx_stream, vcp_rx_buf, size, &xHigherPriorityTaskWoken);
-                furi_check(ret == size);
-            }
-        } else {
-            furi_hal_vcp->rx_stream_full = true;
-        };
-    }
+    uint16_t max_len = xStreamBufferSpacesAvailable(furi_hal_vcp->rx_stream);
+    if (max_len > 0) {
+        if (max_len > APP_RX_DATA_SIZE)
+            max_len = APP_RX_DATA_SIZE;
+        int32_t size = furi_hal_cdc_receive(VCP_IF_NUM, vcp_rx_buf, max_len);
+
+        if (size > 0) {
+            size_t ret = xStreamBufferSendFromISR(furi_hal_vcp->rx_stream, vcp_rx_buf, size, &xHigherPriorityTaskWoken);
+            furi_check(ret == size);
+        }
+    } else {
+        furi_hal_vcp->rx_stream_full = true;
+    };
 
     portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
 }
 
-void furi_hal_vcp_on_cdc_tx_complete(uint8_t if_num) {
-    if (if_num == 0)
-        osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
+static void vcp_on_cdc_tx_complete() {
+    osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
 }
-

firmware/targets/f6/furi-hal/furi-hal-vcp_i.h

@@ -1,13 +0,0 @@
-#pragma once
-
-#include <furi-hal-vcp.h>
-
-void furi_hal_vcp_on_usb_resume();
-
-void furi_hal_vcp_on_usb_suspend();
-
-void furi_hal_vcp_on_cdc_control_line(uint8_t state);
-
-void furi_hal_vcp_on_cdc_rx(uint8_t if_num);
-
-void furi_hal_vcp_on_cdc_tx_complete(uint8_t if_num);

firmware/targets/f6/furi-hal/furi-hal.c

@@ -33,9 +33,9 @@ void furi_hal_init() {
     furi_hal_crypto_init();
 
     // VCP + USB
-    furi_hal_vcp_init();
     furi_hal_usb_init();
     furi_hal_usb_set_config(UsbModeVcpSingle);
+    furi_hal_vcp_init();
     FURI_LOG_I("HAL", "USB OK");
 
     furi_hal_i2c_init();

firmware/targets/f6/target.mk

@@ -72,6 +72,7 @@ C_SOURCES += \
 	$(CUBE_DIR)/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_ll_spi.c \
 	$(CUBE_DIR)/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_ll_tim.c \
 	$(CUBE_DIR)/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_ll_usart.c \
+	$(CUBE_DIR)/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_ll_lpuart.c \
 	$(CUBE_DIR)/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_ll_utils.c
 
 # FreeRTOS

firmware/targets/f7/furi-hal/furi-hal-console.c

@@ -1,4 +1,5 @@
 #include <furi-hal-console.h>
+#include <furi-hal-lpuart.h>
 
 #include <stdbool.h>
 #include <stm32wbxx_ll_gpio.h>
@@ -7,8 +8,12 @@
 
 #include <furi.h>
 
+#define CONSOLE_BAUDRATE 230400
+
 volatile bool furi_hal_console_alive = false;
 
+static void (*irq_cb)(uint8_t ev, uint8_t data);
+
 void furi_hal_console_init() {
     LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
     GPIO_InitStruct.Pin = LL_GPIO_PIN_6|LL_GPIO_PIN_7;
@@ -21,11 +26,11 @@ void furi_hal_console_init() {
 
     LL_USART_InitTypeDef USART_InitStruct = {0};
     USART_InitStruct.PrescalerValue = LL_USART_PRESCALER_DIV1;
-    USART_InitStruct.BaudRate = 230400;
+    USART_InitStruct.BaudRate = CONSOLE_BAUDRATE;
     USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
     USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
     USART_InitStruct.Parity = LL_USART_PARITY_NONE;
-    USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX;
+    USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
     USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
     USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_16;
     LL_USART_Init(USART1, &USART_InitStruct);
@@ -36,12 +41,41 @@ void furi_hal_console_init() {
     LL_USART_Enable(USART1);
 
     while(!LL_USART_IsActiveFlag_TEACK(USART1)) ;
+
+    LL_USART_EnableIT_RXNE_RXFNE(USART1);
+    LL_USART_EnableIT_IDLE(USART1);
+    HAL_NVIC_SetPriority(USART1_IRQn, 5, 0);
+
     furi_hal_console_alive = true;
 
     FURI_LOG_I("FuriHalConsole", "Init OK");
 }
 
-static void furi_hal_console_uart_tx(const uint8_t* buffer, size_t buffer_size) {
+void furi_hal_usart_init() {
+    furi_hal_console_alive = false;
+}
+
+void furi_hal_usart_set_br(uint32_t baud) {
+    if (LL_USART_IsEnabled(USART1)) {
+        // Wait for transfer complete flag
+        while (!LL_USART_IsActiveFlag_TC(USART1));
+        LL_USART_Disable(USART1);
+        uint32_t uartclk = LL_RCC_GetUSARTClockFreq(LL_RCC_USART1_CLKSOURCE);
+        LL_USART_SetBaudRate(USART1, uartclk, LL_USART_PRESCALER_DIV1, LL_USART_OVERSAMPLING_16, baud);
+        LL_USART_Enable(USART1);
+    }
+}
+
+void furi_hal_usart_deinit() {
+    while (!LL_USART_IsActiveFlag_TC(USART1));
+    furi_hal_usart_set_br(CONSOLE_BAUDRATE);
+    furi_hal_console_alive = true;
+}
+
+void furi_hal_usart_tx(const uint8_t* buffer, size_t buffer_size) {
+    if (LL_USART_IsEnabled(USART1) == 0)
+        return;
+
     while(buffer_size > 0) {
         while (!LL_USART_IsActiveFlag_TXE(USART1));
 
@@ -52,12 +86,32 @@ static void furi_hal_console_uart_tx(const uint8_t* buffer, size_t buffer_size)
     }
 }
 
+void furi_hal_usart_set_irq_cb(void (*cb)(UartIrqEvent ev, uint8_t data)) {
+    irq_cb = cb;
+    if (irq_cb == NULL)
+        NVIC_DisableIRQ(USART1_IRQn);
+    else
+        NVIC_EnableIRQ(USART1_IRQn);
+}
+
+void USART1_IRQHandler(void) {
+    if (LL_USART_IsActiveFlag_RXNE_RXFNE(USART1)) {
+        uint8_t data = LL_USART_ReceiveData8(USART1);
+        irq_cb(UartIrqEventRXNE, data);
+    } else if (LL_USART_IsActiveFlag_IDLE(USART1)) {
+        irq_cb(UartIrqEventIDLE, 0);
+        LL_USART_ClearFlag_IDLE(USART1);
+    }
+
+    //TODO: more events
+}
+
 void furi_hal_console_tx(const uint8_t* buffer, size_t buffer_size) {
     if (!furi_hal_console_alive)
         return;
 
     // Transmit data
-    furi_hal_console_uart_tx(buffer, buffer_size);
+    furi_hal_usart_tx(buffer, buffer_size);
     // Wait for TC flag to be raised for last char
     while (!LL_USART_IsActiveFlag_TC(USART1));
 }
@@ -67,9 +121,9 @@ void furi_hal_console_tx_with_new_line(const uint8_t* buffer, size_t buffer_size
         return;
 
     // Transmit data
-    furi_hal_console_uart_tx(buffer, buffer_size);
+    furi_hal_usart_tx(buffer, buffer_size);
     // Transmit new line symbols
-    furi_hal_console_uart_tx((const uint8_t*)"\r\n", 2);
+    furi_hal_usart_tx((const uint8_t*)"\r\n", 2);
     // Wait for TC flag to be raised for last char
     while (!LL_USART_IsActiveFlag_TC(USART1));
 }

firmware/targets/f7/furi-hal/furi-hal-console.h

@@ -7,6 +7,12 @@
 extern "C" {
 #endif
 
+typedef enum {
+    UartIrqEventRXNE,
+    UartIrqEventIDLE,
+    //TODO: more events
+} UartIrqEvent;
+
 void furi_hal_console_init();
 
 void furi_hal_console_tx(const uint8_t* buffer, size_t buffer_size);
@@ -23,6 +29,18 @@ void furi_hal_console_printf(const char format[], ...);
 
 void furi_hal_console_puts(const char* data);
 
+
+void furi_hal_usart_init();
+
+void furi_hal_usart_deinit();
+
+void furi_hal_usart_set_br(uint32_t baud);
+
+void furi_hal_usart_tx(const uint8_t* buffer, size_t buffer_size);
+
+void furi_hal_usart_set_irq_cb(void (*cb)(UartIrqEvent ev, uint8_t data));
+
+
 #ifdef __cplusplus
 }
 #endif

firmware/targets/f7/furi-hal/furi-hal-lpuart.c

@@ -0,0 +1,105 @@
+#include <furi-hal-lpuart.h>
+#include <stdbool.h>
+#include <stm32wbxx_ll_gpio.h>
+#include <stm32wbxx_ll_lpuart.h>
+
+#include <furi.h>
+
+static void (*irq_cb)(uint8_t ev, uint8_t data);
+
+void furi_hal_lpuart_init() {
+    LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
+    GPIO_InitStruct.Pin = PC0_Pin|PC1_Pin;
+    GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
+    GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
+    GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
+    GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
+    GPIO_InitStruct.Alternate = LL_GPIO_AF_8;
+    LL_GPIO_Init(GPIOC, &GPIO_InitStruct);
+
+    LL_RCC_SetLPUARTClockSource(LL_RCC_LPUART1_CLKSOURCE_PCLK1);
+    LL_APB1_GRP2_EnableClock(LL_APB1_GRP2_PERIPH_LPUART1);
+
+    LL_LPUART_InitTypeDef LPUART_InitStruct = {0};
+    LPUART_InitStruct.PrescalerValue = LL_LPUART_PRESCALER_DIV1;
+    LPUART_InitStruct.BaudRate = 115200;
+    LPUART_InitStruct.DataWidth = LL_LPUART_DATAWIDTH_8B;
+    LPUART_InitStruct.StopBits = LL_LPUART_STOPBITS_1;
+    LPUART_InitStruct.Parity = LL_LPUART_PARITY_NONE;
+    LPUART_InitStruct.TransferDirection = LL_LPUART_DIRECTION_TX_RX;
+    LPUART_InitStruct.HardwareFlowControl = LL_LPUART_HWCONTROL_NONE;
+    LL_LPUART_Init(LPUART1, &LPUART_InitStruct);
+    LL_LPUART_SetTXFIFOThreshold(LPUART1, LL_LPUART_FIFOTHRESHOLD_1_8);
+    LL_LPUART_SetRXFIFOThreshold(LPUART1, LL_LPUART_FIFOTHRESHOLD_1_8);
+    LL_LPUART_EnableFIFO(LPUART1);
+
+    LL_LPUART_Enable(LPUART1);
+
+    while((!(LL_LPUART_IsActiveFlag_TEACK(LPUART1))) || (!(LL_LPUART_IsActiveFlag_REACK(LPUART1))));
+
+    LL_LPUART_EnableIT_RXNE_RXFNE(LPUART1);
+    LL_LPUART_EnableIT_IDLE(LPUART1);
+    HAL_NVIC_SetPriority(LPUART1_IRQn, 5, 0);
+
+    FURI_LOG_I("FuriHalLpUart", "Init OK");
+}
+
+void furi_hal_lpuart_set_br(uint32_t baud) {
+    if (LL_LPUART_IsEnabled(LPUART1)) {
+        // Wait for transfer complete flag
+        while (!LL_LPUART_IsActiveFlag_TC(LPUART1));
+        LL_LPUART_Disable(LPUART1);
+        uint32_t uartclk = LL_RCC_GetLPUARTClockFreq(LL_RCC_GetLPUARTClockSource(LL_RCC_LPUART1_CLKSOURCE_PCLK1));
+        if (uartclk/baud > 4095) {
+            LL_LPUART_SetPrescaler(LPUART1, LL_LPUART_PRESCALER_DIV32);
+            LL_LPUART_SetBaudRate(LPUART1, uartclk, LL_LPUART_PRESCALER_DIV32, baud);
+        } else {
+            LL_LPUART_SetPrescaler(LPUART1, LL_LPUART_PRESCALER_DIV1);
+            LL_LPUART_SetBaudRate(LPUART1, uartclk, LL_LPUART_PRESCALER_DIV1, baud);
+        }
+        
+        LL_LPUART_Enable(LPUART1);
+    }
+}
+
+void furi_hal_lpuart_deinit() {
+    furi_hal_lpuart_set_irq_cb(NULL);
+    LL_GPIO_SetPinMode(GPIOC, PC0_Pin, LL_GPIO_MODE_ANALOG);
+    LL_GPIO_SetPinMode(GPIOC, PC1_Pin, LL_GPIO_MODE_ANALOG);
+    LL_LPUART_Disable(LPUART1);
+    LL_APB1_GRP2_DisableClock(LL_APB1_GRP2_PERIPH_LPUART1);
+}
+
+void furi_hal_lpuart_tx(const uint8_t* buffer, size_t buffer_size) {
+    if (LL_LPUART_IsEnabled(LPUART1) == 0)
+        return;
+
+    while(buffer_size > 0) {
+        while (!LL_LPUART_IsActiveFlag_TXE(LPUART1));
+
+        LL_LPUART_TransmitData8(LPUART1, *buffer);
+  
+        buffer++;
+        buffer_size--;
+    }
+}
+
+void furi_hal_lpuart_set_irq_cb(void (*cb)(UartIrqEvent ev, uint8_t data)) {
+    irq_cb = cb;
+    if (irq_cb == NULL)
+        NVIC_DisableIRQ(LPUART1_IRQn);
+    else
+        NVIC_EnableIRQ(LPUART1_IRQn);
+}
+
+void LPUART1_IRQHandler(void) {
+    if (LL_LPUART_IsActiveFlag_RXNE_RXFNE(LPUART1)) {
+        uint8_t data = LL_LPUART_ReceiveData8(LPUART1);
+        irq_cb(UartIrqEventRXNE, data);
+    } else if (LL_LPUART_IsActiveFlag_IDLE(LPUART1)) {
+        irq_cb(UartIrqEventIDLE, 0);
+        LL_LPUART_ClearFlag_IDLE(LPUART1);
+    }
+
+    //TODO: more events
+}

firmware/targets/f7/furi-hal/furi-hal-lpuart.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+#include "furi-hal-console.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+void furi_hal_lpuart_init();
+
+void furi_hal_lpuart_deinit();
+
+void furi_hal_lpuart_set_br(uint32_t baud);
+
+void furi_hal_lpuart_tx(const uint8_t* buffer, size_t buffer_size);
+
+void furi_hal_lpuart_set_irq_cb(void (*cb)(UartIrqEvent ev, uint8_t data));
+
+#ifdef __cplusplus
+}
+#endif

firmware/targets/f7/furi-hal/furi-hal-usb-cdc.c

@@ -1,6 +1,5 @@
 #include "furi-hal-version.h"
 #include "furi-hal-usb_i.h"
-#include "furi-hal-vcp_i.h"
 #include "furi-hal-usb-cdc_i.h"
 #include <furi.h>
 
@@ -17,6 +16,8 @@
 
 #define CDC_NTF_SZ      0x08
 
+#define IF_NUM_MAX 2
+
 struct CdcIadDescriptor {
     struct usb_iad_descriptor           comm_iad;
     struct usb_interface_descriptor     comm;
@@ -343,12 +344,8 @@ static const struct CdcConfigDescriptorDual cdc_cfg_desc_dual = {
     },
 };
 
-static struct usb_cdc_line_coding cdc_line = {
-    .dwDTERate          = 38400,
-    .bCharFormat        = USB_CDC_1_STOP_BITS,
-    .bParityType        = USB_CDC_NO_PARITY,
-    .bDataBits          = 8,
-};
+static struct usb_cdc_line_coding cdc_config[IF_NUM_MAX] = {};
+
 static void cdc_init(usbd_device* dev, struct UsbInterface* intf);
 static void cdc_deinit(usbd_device *dev);
 static void cdc_on_wakeup(usbd_device *dev);
@@ -358,6 +355,7 @@ static usbd_respond cdc_ep_config (usbd_device *dev, uint8_t cfg);
 static usbd_respond cdc_control (usbd_device *dev, usbd_ctlreq *req, usbd_rqc_callback *callback);
 static usbd_device* usb_dev;
 static struct UsbInterface* cdc_if_cur = NULL;
+static CdcCallbacks* callbacks[IF_NUM_MAX] = {NULL};
 
 struct UsbInterface usb_cdc_single = {
     .init = cdc_init,
@@ -429,6 +427,17 @@ static void cdc_deinit(usbd_device *dev) {
     cdc_if_cur = NULL;
 }
 
+void furi_hal_cdc_set_callbacks(uint8_t if_num, CdcCallbacks* cb) {
+    if (if_num < 2)
+        callbacks[if_num] = cb;
+}
+
+struct usb_cdc_line_coding* furi_hal_cdc_get_port_settings(uint8_t if_num) {
+    if (if_num < 2)
+        return &cdc_config[if_num];
+    return NULL;
+}
+
 void furi_hal_cdc_send(uint8_t if_num, uint8_t* buf, uint16_t len) {
     if (if_num == 0)
         usbd_ep_write(usb_dev, CDC0_TXD_EP, buf, len);
@@ -444,25 +453,47 @@ int32_t furi_hal_cdc_receive(uint8_t if_num, uint8_t* buf, uint16_t max_len) {
 }
 
 static void cdc_on_wakeup(usbd_device *dev) {
-    furi_hal_vcp_on_usb_resume();
+    for (uint8_t i = 0; i < IF_NUM_MAX; i++) {
+        if (callbacks[i] != NULL) {
+            if (callbacks[i]->state_callback != NULL)
+                callbacks[i]->state_callback(1);
+        }
+    }
 }
 
 static void cdc_on_suspend(usbd_device *dev) {
-    furi_hal_vcp_on_usb_suspend();
+    for (uint8_t i = 0; i < IF_NUM_MAX; i++) {
+        if (callbacks[i] != NULL) {
+            if (callbacks[i]->state_callback != NULL)
+                callbacks[i]->state_callback(0);
+        }
+    }
 }
 
 static void cdc_rx_ep_callback (usbd_device *dev, uint8_t event, uint8_t ep) {
+    uint8_t if_num = 0;
     if (ep == CDC0_RXD_EP)
-        furi_hal_vcp_on_cdc_rx(0);
+        if_num = 0;
     else
-        furi_hal_vcp_on_cdc_rx(1);
+        if_num = 1;
+    
+    if (callbacks[if_num] != NULL) {
+        if (callbacks[if_num]->rx_ep_callback != NULL)
+            callbacks[if_num]->rx_ep_callback();
+    }
 }
 
 static void cdc_tx_ep_callback (usbd_device *dev, uint8_t event, uint8_t ep) {
+    uint8_t if_num = 0;
     if (ep == CDC0_TXD_EP)
-        furi_hal_vcp_on_cdc_tx_complete(0);
+        if_num = 0;
     else
-        furi_hal_vcp_on_cdc_tx_complete(1);
+        if_num = 1;
+    
+    if (callbacks[if_num] != NULL) {
+        if (callbacks[if_num]->tx_ep_callback != NULL)
+            callbacks[if_num]->tx_ep_callback();
+    }
 }
 
 static void cdc_txrx_ep_callback (usbd_device *dev, uint8_t event, uint8_t ep) {
@@ -494,13 +525,15 @@ static usbd_respond cdc_ep_config (usbd_device *dev, uint8_t cfg) {
         return usbd_ack;
     case 1:
         /* configuring device */
-        if ((CDC0_TXD_EP & 0x7F) != (CDC0_RXD_EP & 0x7F)) {
+        if ((CDC0_TXD_EP & 0x7F) != (CDC0_RXD_EP & 0x7F)) { 
+            // 2x unidirectional endpoint mode with dualbuf
             usbd_ep_config(dev, CDC0_RXD_EP, USB_EPTYPE_BULK | USB_EPTYPE_DBLBUF, CDC_DATA_SZ);
             usbd_ep_config(dev, CDC0_TXD_EP, USB_EPTYPE_BULK | USB_EPTYPE_DBLBUF, CDC_DATA_SZ);
             usbd_ep_config(dev, CDC0_NTF_EP, USB_EPTYPE_INTERRUPT, CDC_NTF_SZ);
             usbd_reg_endpoint(dev, CDC0_RXD_EP, cdc_rx_ep_callback);
             usbd_reg_endpoint(dev, CDC0_TXD_EP, cdc_tx_ep_callback);
-        } else {
+        } else { 
+            // 1x bidirectional endpoint mode
             usbd_ep_config(dev, CDC0_RXD_EP, USB_EPTYPE_BULK, CDC_DATA_SZ);
             usbd_ep_config(dev, CDC0_TXD_EP, USB_EPTYPE_BULK, CDC_DATA_SZ);
             usbd_ep_config(dev, CDC0_NTF_EP, USB_EPTYPE_INTERRUPT, CDC_NTF_SZ);
@@ -532,20 +565,33 @@ static usbd_respond cdc_ep_config (usbd_device *dev, uint8_t cfg) {
 }
 
 /* Control requests handler */
-static usbd_respond cdc_control (usbd_device *dev, usbd_ctlreq *req, usbd_rqc_callback *callback) {
+static usbd_respond cdc_control(usbd_device* dev, usbd_ctlreq* req, usbd_rqc_callback* callback) {
     /* CDC control requests */
-    if (((USB_REQ_RECIPIENT | USB_REQ_TYPE) & req->bmRequestType) == (USB_REQ_INTERFACE | USB_REQ_CLASS)
-        && req->wIndex == 0 ) {
-        switch (req->bRequest) {
+    uint8_t if_num = 0;
+    if(((USB_REQ_RECIPIENT | USB_REQ_TYPE) & req->bmRequestType) == (USB_REQ_INTERFACE | USB_REQ_CLASS) 
+        && (req->wIndex == 0 || req->wIndex == 2)) {
+        if (req->wIndex == 0)
+            if_num = 0;
+        else
+            if_num = 1;
+
+        switch(req->bRequest) {
         case USB_CDC_SET_CONTROL_LINE_STATE:
-            furi_hal_vcp_on_cdc_control_line(req->wValue);
+            if (callbacks[if_num] != NULL) {
+                if (callbacks[if_num]->ctrl_line_callback != NULL)
+                    callbacks[if_num]->ctrl_line_callback(req->wValue);
+            }
             return usbd_ack;
         case USB_CDC_SET_LINE_CODING:
-            memcpy(&cdc_line, req->data, sizeof(cdc_line));
+            memcpy(&cdc_config[if_num], req->data, sizeof(cdc_config[0]));
+            if (callbacks[if_num] != NULL) {
+                if (callbacks[if_num]->config_callback != NULL)
+                    callbacks[if_num]->config_callback(&cdc_config[if_num]);
+            }
             return usbd_ack;
         case USB_CDC_GET_LINE_CODING:
-            dev->status.data_ptr = &cdc_line;
-            dev->status.data_count = sizeof(cdc_line);
+            dev->status.data_ptr = &cdc_config[if_num];
+            dev->status.data_count = sizeof(cdc_config[0]);
             return usbd_ack;
         default:
             return usbd_fail;

firmware/targets/f7/furi-hal/furi-hal-usb-cdc_i.h

@@ -1,6 +1,21 @@
 #pragma once
 
-#define CDC_DATA_SZ     0x40
+#include <stdint.h>
+#include "usb_cdc.h" 
+
+#define CDC_DATA_SZ 64
+
+typedef struct {
+    void (*tx_ep_callback)(void);
+    void (*rx_ep_callback)(void);
+    void (*state_callback)(uint8_t state);
+    void (*ctrl_line_callback)(uint8_t state);
+    void (*config_callback)(struct usb_cdc_line_coding* config);
+} CdcCallbacks;
+
+void furi_hal_cdc_set_callbacks(uint8_t if_num, CdcCallbacks* cb);
+
+struct usb_cdc_line_coding* furi_hal_cdc_get_port_settings(uint8_t if_num);
 
 void furi_hal_cdc_send(uint8_t if_num, uint8_t* buf, uint16_t len);
 

firmware/targets/f7/furi-hal/furi-hal-usb.c

@@ -1,7 +1,6 @@
 #include "furi-hal-version.h"
 #include "furi-hal-usb_i.h"
 #include "furi-hal-usb.h"
-#include "furi-hal-vcp_i.h"
 #include <furi.h>
 
 #include "usb.h"
@@ -34,6 +33,7 @@ struct UsbCfg{
     UsbMode mode_cur;
     UsbMode mode_next;
     bool enabled;
+    bool connected;
 } usb_config;
 
 static void furi_hal_usb_tmr_cb(void* context);
@@ -158,11 +158,15 @@ static usbd_respond usb_descriptor_get (usbd_ctlreq *req, void **address, uint16
 }
 
 static void susp_evt(usbd_device *dev, uint8_t event, uint8_t ep) {
-    if (usb_if_modes[usb_config.mode_cur] != NULL)
+    if ((usb_if_modes[usb_config.mode_cur] != NULL) && (usb_config.connected == true)) {
+        usb_config.connected = false;
         usb_if_modes[usb_config.mode_cur]->suspend(&udev);
+    }
 }
 
 static void wkup_evt(usbd_device *dev, uint8_t event, uint8_t ep) {
-    if (usb_if_modes[usb_config.mode_cur] != NULL)
+    if ((usb_if_modes[usb_config.mode_cur] != NULL) && (usb_config.connected == false)) {
+        usb_config.connected = true;
         usb_if_modes[usb_config.mode_cur]->wakeup(&udev);
+    } 
 }

firmware/targets/f7/furi-hal/furi-hal-vcp.c

@@ -1,4 +1,3 @@
-#include <furi-hal-vcp_i.h>
 #include <furi-hal-usb-cdc_i.h>
 
 #include <furi.h>
@@ -7,6 +6,7 @@
 #define APP_RX_DATA_SIZE CDC_DATA_SZ
 #define APP_TX_DATA_SIZE CDC_DATA_SZ
 #define FURI_HAL_VCP_RX_BUFFER_SIZE (APP_RX_DATA_SIZE * 16)
+#define VCP_IF_NUM 0
 
 typedef struct {
     volatile bool connected;
@@ -17,6 +17,19 @@ typedef struct {
     osSemaphoreId_t tx_semaphore;
 } FuriHalVcp;
 
+static void vcp_on_cdc_tx_complete();
+static void vcp_on_cdc_rx();
+static void vcp_state_callback(uint8_t state);
+static void vcp_on_cdc_control_line(uint8_t state);
+
+static CdcCallbacks cdc_cb = {
+    vcp_on_cdc_tx_complete,
+    vcp_on_cdc_rx,
+    vcp_state_callback,
+    vcp_on_cdc_control_line,
+    NULL,
+};
+
 static FuriHalVcp* furi_hal_vcp = NULL;
 
 static const uint8_t ascii_soh = 0x01;
@@ -34,9 +47,22 @@ void furi_hal_vcp_init() {
 
     furi_hal_vcp->tx_semaphore = osSemaphoreNew(1, 1, NULL);
 
+    furi_hal_cdc_set_callbacks(VCP_IF_NUM, &cdc_cb);
+
     FURI_LOG_I("FuriHalVcp", "Init OK");
 }
 
+void furi_hal_vcp_enable() {
+    furi_hal_cdc_set_callbacks(VCP_IF_NUM, &cdc_cb);
+    furi_hal_vcp->connected = true;
+}
+
+void furi_hal_vcp_disable() {
+    furi_hal_cdc_set_callbacks(VCP_IF_NUM, NULL);
+    furi_hal_vcp->connected = false;
+    osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
+}
+
 size_t furi_hal_vcp_rx(uint8_t* buffer, size_t size) {
     furi_assert(furi_hal_vcp);
 
@@ -68,24 +94,22 @@ void furi_hal_vcp_tx(const uint8_t* buffer, size_t size) {
             batch_size = APP_TX_DATA_SIZE;
         }
 
-        furi_hal_cdc_send(0, (uint8_t*)buffer, batch_size);
+        furi_hal_cdc_send(VCP_IF_NUM, (uint8_t*)buffer, batch_size);
         size -= batch_size;
         buffer += batch_size;
     }
 }
 
-void furi_hal_vcp_on_usb_resume() {
-    osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
-}
-
-void furi_hal_vcp_on_usb_suspend() {
-    if (furi_hal_vcp->connected) {
+static void vcp_state_callback(uint8_t state) {
+    if (state == 1)
+        osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
+    else if (furi_hal_vcp->connected) {
         furi_hal_vcp->connected = false;
         osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
     }
 }
 
-void furi_hal_vcp_on_cdc_control_line(uint8_t state) {
+static void vcp_on_cdc_control_line(uint8_t state) {
 
     BaseType_t xHigherPriorityTaskWoken = pdFALSE;
     // bit 0: DTR state, bit 1: RTS state
@@ -110,30 +134,26 @@ void furi_hal_vcp_on_cdc_control_line(uint8_t state) {
     portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
 }
 
-void furi_hal_vcp_on_cdc_rx(uint8_t if_num) { 
+static void vcp_on_cdc_rx() { 
     BaseType_t xHigherPriorityTaskWoken = pdFALSE;
 
-    if (if_num == 0) {
-        uint16_t max_len = xStreamBufferSpacesAvailable(furi_hal_vcp->rx_stream);
-        if (max_len > 0) {
-            if (max_len > APP_RX_DATA_SIZE)
-                max_len = APP_RX_DATA_SIZE;
-            int32_t size = furi_hal_cdc_receive(0, vcp_rx_buf, max_len);
-
-            if (size > 0) {
-                size_t ret = xStreamBufferSendFromISR(furi_hal_vcp->rx_stream, vcp_rx_buf, size, &xHigherPriorityTaskWoken);
-                furi_check(ret == size);
-            }
-        } else {
-            furi_hal_vcp->rx_stream_full = true;
-        };
-    }
+    uint16_t max_len = xStreamBufferSpacesAvailable(furi_hal_vcp->rx_stream);
+    if (max_len > 0) {
+        if (max_len > APP_RX_DATA_SIZE)
+            max_len = APP_RX_DATA_SIZE;
+        int32_t size = furi_hal_cdc_receive(VCP_IF_NUM, vcp_rx_buf, max_len);
+
+        if (size > 0) {
+            size_t ret = xStreamBufferSendFromISR(furi_hal_vcp->rx_stream, vcp_rx_buf, size, &xHigherPriorityTaskWoken);
+            furi_check(ret == size);
+        }
+    } else {
+        furi_hal_vcp->rx_stream_full = true;
+    };
 
     portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
 }
 
-void furi_hal_vcp_on_cdc_tx_complete(uint8_t if_num) {
-    if (if_num == 0)
-        osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
+static void vcp_on_cdc_tx_complete() {
+    osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
 }
-

firmware/targets/f7/furi-hal/furi-hal-vcp_i.h

@@ -1,13 +0,0 @@
-#pragma once
-
-#include <furi-hal-vcp.h>
-
-void furi_hal_vcp_on_usb_resume();
-
-void furi_hal_vcp_on_usb_suspend();
-
-void furi_hal_vcp_on_cdc_control_line(uint8_t state);
-
-void furi_hal_vcp_on_cdc_rx(uint8_t if_num);
-
-void furi_hal_vcp_on_cdc_tx_complete(uint8_t if_num);

firmware/targets/f7/furi-hal/furi-hal.c

@@ -33,9 +33,9 @@ void furi_hal_init() {
     furi_hal_crypto_init();
 
     // VCP + USB
-    furi_hal_vcp_init();
     furi_hal_usb_init();
     furi_hal_usb_set_config(UsbModeVcpSingle);
+    furi_hal_vcp_init();
     FURI_LOG_I("HAL", "USB OK");
 
     furi_hal_i2c_init();

firmware/targets/f7/target.mk

@@ -72,6 +72,7 @@ C_SOURCES += \
 	$(CUBE_DIR)/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_ll_spi.c \
 	$(CUBE_DIR)/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_ll_tim.c \
 	$(CUBE_DIR)/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_ll_usart.c \
+	$(CUBE_DIR)/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_ll_lpuart.c \
 	$(CUBE_DIR)/Drivers/STM32WBxx_HAL_Driver/Src/stm32wbxx_ll_utils.c
 
 # FreeRTOS

firmware/targets/furi-hal-include/furi-hal-vcp.h

@@ -17,6 +17,14 @@ extern "C" {
  */
 void furi_hal_vcp_init();
 
+/** Disable VCP to make CDC interface usable by other application
+ */
+void furi_hal_vcp_disable();
+
+/** Enable VCP
+ */
+void furi_hal_vcp_enable();
+
 /** Recieve data from VCP Waits till some data arrives, never returns 0
  *
  * @param      buffer  pointer to buffer

firmware/targets/furi-hal-include/furi-hal.h

@@ -36,6 +36,7 @@ template <unsigned int N> struct STOP_EXTERNING_ME {};
 #include "furi-hal-usb.h"
 #include "furi-hal-usb-hid.h"
 #include "furi-hal-compress.h"
+#include "furi-hal-lpuart.h"
 
 /** Init furi-hal */
 void furi_hal_init();