[FL-2627] Flipper applications: SDK, build and debug system (#1387)

* Added support for running applications from SD card (FAPs - Flipper Application Packages)
* Added plugin_dist target for fbt to build FAPs
* All apps of type FlipperAppType.EXTERNAL and FlipperAppType.PLUGIN are built as FAPs by default
* Updated VSCode configuration for new fbt features - re-deploy stock configuration to use them
* Added debugging support for FAPs with fbt debug & VSCode
* Added public firmware API with automated versioning

Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: SG <who.just.the.doctor@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>

applications/main/gpio/application.fam

@@ -0,0 +1,11 @@
+App(
+    appid="gpio",
+    name="GPIO",
+    apptype=FlipperAppType.APP,
+    entry_point="gpio_app",
+    cdefines=["APP_GPIO"],
+    requires=["gui"],
+    stack_size=1 * 1024,
+    icon="A_GPIO_14",
+    order=50,
+)

applications/main/gpio/gpio_app.c

@@ -0,0 +1,106 @@
+#include "gpio_app_i.h"
+
+#include <furi.h>
+#include <furi_hal.h>
+
+static bool gpio_app_custom_event_callback(void* context, uint32_t event) {
+    furi_assert(context);
+    GpioApp* app = context;
+    return scene_manager_handle_custom_event(app->scene_manager, event);
+}
+
+static bool gpio_app_back_event_callback(void* context) {
+    furi_assert(context);
+    GpioApp* app = context;
+    return scene_manager_handle_back_event(app->scene_manager);
+}
+
+static void gpio_app_tick_event_callback(void* context) {
+    furi_assert(context);
+    GpioApp* app = context;
+    scene_manager_handle_tick_event(app->scene_manager);
+}
+
+GpioApp* gpio_app_alloc() {
+    GpioApp* app = malloc(sizeof(GpioApp));
+
+    app->gui = furi_record_open(RECORD_GUI);
+
+    app->view_dispatcher = view_dispatcher_alloc();
+    app->scene_manager = scene_manager_alloc(&gpio_scene_handlers, app);
+    view_dispatcher_enable_queue(app->view_dispatcher);
+    view_dispatcher_set_event_callback_context(app->view_dispatcher, app);
+
+    view_dispatcher_set_custom_event_callback(
+        app->view_dispatcher, gpio_app_custom_event_callback);
+    view_dispatcher_set_navigation_event_callback(
+        app->view_dispatcher, gpio_app_back_event_callback);
+    view_dispatcher_set_tick_event_callback(
+        app->view_dispatcher, gpio_app_tick_event_callback, 100);
+
+    view_dispatcher_attach_to_gui(app->view_dispatcher, app->gui, ViewDispatcherTypeFullscreen);
+
+    app->notifications = furi_record_open(RECORD_NOTIFICATION);
+
+    app->var_item_list = variable_item_list_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        GpioAppViewVarItemList,
+        variable_item_list_get_view(app->var_item_list));
+    app->gpio_test = gpio_test_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, GpioAppViewGpioTest, gpio_test_get_view(app->gpio_test));
+
+    app->widget = widget_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, GpioAppViewUsbUartCloseRpc, widget_get_view(app->widget));
+
+    app->gpio_usb_uart = gpio_usb_uart_alloc();
+    view_dispatcher_add_view(
+        app->view_dispatcher, GpioAppViewUsbUart, gpio_usb_uart_get_view(app->gpio_usb_uart));
+
+    view_dispatcher_add_view(
+        app->view_dispatcher,
+        GpioAppViewUsbUartCfg,
+        variable_item_list_get_view(app->var_item_list));
+
+    scene_manager_next_scene(app->scene_manager, GpioSceneStart);
+
+    return app;
+}
+
+void gpio_app_free(GpioApp* app) {
+    furi_assert(app);
+
+    // Views
+    view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewVarItemList);
+    view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewGpioTest);
+    view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewUsbUart);
+    view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewUsbUartCfg);
+    view_dispatcher_remove_view(app->view_dispatcher, GpioAppViewUsbUartCloseRpc);
+    variable_item_list_free(app->var_item_list);
+    widget_free(app->widget);
+    gpio_test_free(app->gpio_test);
+    gpio_usb_uart_free(app->gpio_usb_uart);
+
+    // View dispatcher
+    view_dispatcher_free(app->view_dispatcher);
+    scene_manager_free(app->scene_manager);
+
+    // Close records
+    furi_record_close(RECORD_GUI);
+    furi_record_close(RECORD_NOTIFICATION);
+
+    free(app);
+}
+
+int32_t gpio_app(void* p) {
+    UNUSED(p);
+    GpioApp* gpio_app = gpio_app_alloc();
+
+    view_dispatcher_run(gpio_app->view_dispatcher);
+
+    gpio_app_free(gpio_app);
+
+    return 0;
+}

applications/main/gpio/gpio_app.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct GpioApp GpioApp;
+
+#ifdef __cplusplus
+}
+#endif

applications/main/gpio/gpio_app_i.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include "gpio_app.h"
+#include "gpio_item.h"
+#include "scenes/gpio_scene.h"
+#include "gpio_custom_event.h"
+#include "usb_uart_bridge.h"
+
+#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 <gui/modules/widget.h>
+#include "views/gpio_test.h"
+#include "views/gpio_usb_uart.h"
+
+struct GpioApp {
+    Gui* gui;
+    NotificationApp* notifications;
+    ViewDispatcher* view_dispatcher;
+    SceneManager* scene_manager;
+    Widget* widget;
+
+    VariableItemList* var_item_list;
+    GpioTest* gpio_test;
+    GpioUsbUart* gpio_usb_uart;
+    UsbUartBridge* usb_uart_bridge;
+};
+
+typedef enum {
+    GpioAppViewVarItemList,
+    GpioAppViewGpioTest,
+    GpioAppViewUsbUart,
+    GpioAppViewUsbUartCfg,
+    GpioAppViewUsbUartCloseRpc,
+} GpioAppView;

applications/main/gpio/gpio_custom_event.h

@@ -0,0 +1,12 @@
+#pragma once
+
+typedef enum {
+    GpioStartEventOtgOff = 0,
+    GpioStartEventOtgOn,
+    GpioStartEventManualControl,
+    GpioStartEventUsbUart,
+
+    GpioCustomEventErrorBack,
+
+    GpioUsbUartEventConfig,
+} GpioCustomEvent;

applications/main/gpio/gpio_item.c

@@ -0,0 +1,51 @@
+#include "gpio_item.h"
+
+#include <furi_hal_resources.h>
+
+typedef struct {
+    const char* name;
+    const GpioPin* pin;
+} GpioItem;
+
+static const GpioItem gpio_item[GPIO_ITEM_COUNT] = {
+    {"1.2: PA7", &gpio_ext_pa7},
+    {"1.3: PA6", &gpio_ext_pa6},
+    {"1.4: PA4", &gpio_ext_pa4},
+    {"1.5: PB3", &gpio_ext_pb3},
+    {"1.6: PB2", &gpio_ext_pb2},
+    {"1.7: PC3", &gpio_ext_pc3},
+    {"2.7: PC1", &gpio_ext_pc1},
+    {"2.8: PC0", &gpio_ext_pc0},
+};
+
+void gpio_item_configure_pin(uint8_t index, GpioMode mode) {
+    furi_assert(index < GPIO_ITEM_COUNT);
+    furi_hal_gpio_write(gpio_item[index].pin, false);
+    furi_hal_gpio_init(gpio_item[index].pin, mode, GpioPullNo, GpioSpeedVeryHigh);
+}
+
+void gpio_item_configure_all_pins(GpioMode mode) {
+    for(uint8_t i = 0; i < GPIO_ITEM_COUNT; i++) {
+        gpio_item_configure_pin(i, mode);
+    }
+}
+
+void gpio_item_set_pin(uint8_t index, bool level) {
+    furi_assert(index < GPIO_ITEM_COUNT);
+    furi_hal_gpio_write(gpio_item[index].pin, level);
+}
+
+void gpio_item_set_all_pins(bool level) {
+    for(uint8_t i = 0; i < GPIO_ITEM_COUNT; i++) {
+        gpio_item_set_pin(i, level);
+    }
+}
+
+const char* gpio_item_get_pin_name(uint8_t index) {
+    furi_assert(index < GPIO_ITEM_COUNT + 1);
+    if(index == GPIO_ITEM_COUNT) {
+        return "ALL";
+    } else {
+        return gpio_item[index].name;
+    }
+}

applications/main/gpio/gpio_item.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <furi_hal_gpio.h>
+
+#define GPIO_ITEM_COUNT 8
+
+void gpio_item_configure_pin(uint8_t index, GpioMode mode);
+
+void gpio_item_configure_all_pins(GpioMode mode);
+
+void gpio_item_set_pin(uint8_t index, bool level);
+
+void gpio_item_set_all_pins(bool level);
+
+const char* gpio_item_get_pin_name(uint8_t index);

applications/main/gpio/scenes/gpio_scene.c

@@ -0,0 +1,30 @@
+#include "gpio_scene.h"
+
+// Generate scene on_enter handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_enter,
+void (*const gpio_scene_on_enter_handlers[])(void*) = {
+#include "gpio_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Generate scene on_event handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_event,
+bool (*const gpio_scene_on_event_handlers[])(void* context, SceneManagerEvent event) = {
+#include "gpio_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Generate scene on_exit handlers array
+#define ADD_SCENE(prefix, name, id) prefix##_scene_##name##_on_exit,
+void (*const gpio_scene_on_exit_handlers[])(void* context) = {
+#include "gpio_scene_config.h"
+};
+#undef ADD_SCENE
+
+// Initialize scene handlers configuration structure
+const SceneManagerHandlers gpio_scene_handlers = {
+    .on_enter_handlers = gpio_scene_on_enter_handlers,
+    .on_event_handlers = gpio_scene_on_event_handlers,
+    .on_exit_handlers = gpio_scene_on_exit_handlers,
+    .scene_num = GpioSceneNum,
+};

applications/main/gpio/scenes/gpio_scene.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <gui/scene_manager.h>
+
+// Generate scene id and total number
+#define ADD_SCENE(prefix, name, id) GpioScene##id,
+typedef enum {
+#include "gpio_scene_config.h"
+    GpioSceneNum,
+} GpioScene;
+#undef ADD_SCENE
+
+extern const SceneManagerHandlers gpio_scene_handlers;
+
+// Generate scene on_enter handlers declaration
+#define ADD_SCENE(prefix, name, id) void prefix##_scene_##name##_on_enter(void*);
+#include "gpio_scene_config.h"
+#undef ADD_SCENE
+
+// Generate scene on_event handlers declaration
+#define ADD_SCENE(prefix, name, id) \
+    bool prefix##_scene_##name##_on_event(void* context, SceneManagerEvent event);
+#include "gpio_scene_config.h"
+#undef ADD_SCENE
+
+// Generate scene on_exit handlers declaration
+#define ADD_SCENE(prefix, name, id) void prefix##_scene_##name##_on_exit(void* context);
+#include "gpio_scene_config.h"
+#undef ADD_SCENE

applications/main/gpio/scenes/gpio_scene_config.h

@@ -0,0 +1,5 @@
+ADD_SCENE(gpio, start, Start)
+ADD_SCENE(gpio, test, Test)
+ADD_SCENE(gpio, usb_uart, UsbUart)
+ADD_SCENE(gpio, usb_uart_cfg, UsbUartCfg)
+ADD_SCENE(gpio, usb_uart_close_rpc, UsbUartCloseRpc)

applications/main/gpio/scenes/gpio_scene_start.c

@@ -0,0 +1,104 @@
+#include "../gpio_app_i.h"
+#include "furi_hal_power.h"
+#include "furi_hal_usb.h"
+
+enum GpioItem {
+    GpioItemUsbUart,
+    GpioItemTest,
+    GpioItemOtg,
+};
+
+enum GpioOtg {
+    GpioOtgOff,
+    GpioOtgOn,
+    GpioOtgSettingsNum,
+};
+
+const char* const gpio_otg_text[GpioOtgSettingsNum] = {
+    "OFF",
+    "ON",
+};
+
+static void gpio_scene_start_var_list_enter_callback(void* context, uint32_t index) {
+    furi_assert(context);
+    GpioApp* app = context;
+    if(index == GpioItemTest) {
+        view_dispatcher_send_custom_event(app->view_dispatcher, GpioStartEventManualControl);
+    } else if(index == GpioItemUsbUart) {
+        view_dispatcher_send_custom_event(app->view_dispatcher, GpioStartEventUsbUart);
+    }
+}
+
+static void gpio_scene_start_var_list_change_callback(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, gpio_otg_text[index]);
+    if(index == GpioOtgOff) {
+        view_dispatcher_send_custom_event(app->view_dispatcher, GpioStartEventOtgOff);
+    } else if(index == GpioOtgOn) {
+        view_dispatcher_send_custom_event(app->view_dispatcher, GpioStartEventOtgOn);
+    }
+}
+
+void gpio_scene_start_on_enter(void* context) {
+    GpioApp* app = context;
+    VariableItemList* var_item_list = app->var_item_list;
+
+    VariableItem* item;
+    variable_item_list_set_enter_callback(
+        var_item_list, gpio_scene_start_var_list_enter_callback, app);
+
+    variable_item_list_add(var_item_list, "USB-UART Bridge", 0, NULL, NULL);
+
+    variable_item_list_add(var_item_list, "GPIO Manual Control", 0, NULL, NULL);
+
+    item = variable_item_list_add(
+        var_item_list,
+        "5V on GPIO",
+        GpioOtgSettingsNum,
+        gpio_scene_start_var_list_change_callback,
+        app);
+    if(furi_hal_power_is_otg_enabled()) {
+        variable_item_set_current_value_index(item, GpioOtgOn);
+        variable_item_set_current_value_text(item, gpio_otg_text[GpioOtgOn]);
+    } else {
+        variable_item_set_current_value_index(item, GpioOtgOff);
+        variable_item_set_current_value_text(item, gpio_otg_text[GpioOtgOff]);
+    }
+
+    variable_item_list_set_selected_item(
+        var_item_list, scene_manager_get_scene_state(app->scene_manager, GpioSceneStart));
+
+    view_dispatcher_switch_to_view(app->view_dispatcher, GpioAppViewVarItemList);
+}
+
+bool gpio_scene_start_on_event(void* context, SceneManagerEvent event) {
+    GpioApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == GpioStartEventOtgOn) {
+            furi_hal_power_enable_otg();
+        } else if(event.event == GpioStartEventOtgOff) {
+            furi_hal_power_disable_otg();
+        } else if(event.event == GpioStartEventManualControl) {
+            scene_manager_set_scene_state(app->scene_manager, GpioSceneStart, GpioItemTest);
+            scene_manager_next_scene(app->scene_manager, GpioSceneTest);
+        } else if(event.event == GpioStartEventUsbUart) {
+            scene_manager_set_scene_state(app->scene_manager, GpioSceneStart, GpioItemUsbUart);
+            if(!furi_hal_usb_is_locked()) {
+                scene_manager_next_scene(app->scene_manager, GpioSceneUsbUart);
+            } else {
+                scene_manager_next_scene(app->scene_manager, GpioSceneUsbUartCloseRpc);
+            }
+        }
+        consumed = true;
+    }
+    return consumed;
+}
+
+void gpio_scene_start_on_exit(void* context) {
+    GpioApp* app = context;
+    variable_item_list_reset(app->var_item_list);
+}

applications/main/gpio/scenes/gpio_scene_test.c

@@ -0,0 +1,30 @@
+#include "../gpio_app_i.h"
+
+void gpio_scene_test_ok_callback(InputType type, void* context) {
+    furi_assert(context);
+    GpioApp* app = context;
+
+    if(type == InputTypePress) {
+        notification_message(app->notifications, &sequence_set_green_255);
+    } else if(type == InputTypeRelease) {
+        notification_message(app->notifications, &sequence_reset_green);
+    }
+}
+
+void gpio_scene_test_on_enter(void* context) {
+    GpioApp* app = context;
+    gpio_item_configure_all_pins(GpioModeOutputPushPull);
+    gpio_test_set_ok_callback(app->gpio_test, gpio_scene_test_ok_callback, app);
+    view_dispatcher_switch_to_view(app->view_dispatcher, GpioAppViewGpioTest);
+}
+
+bool gpio_scene_test_on_event(void* context, SceneManagerEvent event) {
+    UNUSED(context);
+    UNUSED(event);
+    return false;
+}
+
+void gpio_scene_test_on_exit(void* context) {
+    UNUSED(context);
+    gpio_item_configure_all_pins(GpioModeAnalog);
+}

applications/main/gpio/scenes/gpio_scene_usb_uart.c

@@ -0,0 +1,67 @@
+#include "../gpio_app_i.h"
+#include "../usb_uart_bridge.h"
+
+typedef struct {
+    UsbUartConfig cfg;
+    UsbUartState state;
+} SceneUsbUartBridge;
+
+static SceneUsbUartBridge* scene_usb_uart;
+
+void gpio_scene_usb_uart_callback(GpioCustomEvent event, void* context) {
+    furi_assert(context);
+    GpioApp* app = context;
+    view_dispatcher_send_custom_event(app->view_dispatcher, event);
+}
+
+void gpio_scene_usb_uart_on_enter(void* context) {
+    GpioApp* app = context;
+    uint32_t prev_state = scene_manager_get_scene_state(app->scene_manager, GpioAppViewUsbUart);
+    if(prev_state == 0) {
+        scene_usb_uart = malloc(sizeof(SceneUsbUartBridge));
+        scene_usb_uart->cfg.vcp_ch = 0; // TODO: settings load
+        scene_usb_uart->cfg.uart_ch = 0;
+        scene_usb_uart->cfg.flow_pins = 0;
+        scene_usb_uart->cfg.baudrate_mode = 0;
+        scene_usb_uart->cfg.baudrate = 0;
+        app->usb_uart_bridge = usb_uart_enable(&scene_usb_uart->cfg);
+    }
+
+    usb_uart_get_config(app->usb_uart_bridge, &scene_usb_uart->cfg);
+    usb_uart_get_state(app->usb_uart_bridge, &scene_usb_uart->state);
+
+    gpio_usb_uart_set_callback(app->gpio_usb_uart, gpio_scene_usb_uart_callback, app);
+    scene_manager_set_scene_state(app->scene_manager, GpioSceneUsbUart, 0);
+    view_dispatcher_switch_to_view(app->view_dispatcher, GpioAppViewUsbUart);
+    notification_message(app->notifications, &sequence_display_backlight_enforce_on);
+}
+
+bool gpio_scene_usb_uart_on_event(void* context, SceneManagerEvent event) {
+    GpioApp* app = context;
+    if(event.type == SceneManagerEventTypeCustom) {
+        scene_manager_set_scene_state(app->scene_manager, GpioSceneUsbUart, 1);
+        scene_manager_next_scene(app->scene_manager, GpioSceneUsbUartCfg);
+        return true;
+    } else if(event.type == SceneManagerEventTypeTick) {
+        uint32_t tx_cnt_last = scene_usb_uart->state.tx_cnt;
+        uint32_t rx_cnt_last = scene_usb_uart->state.rx_cnt;
+        usb_uart_get_state(app->usb_uart_bridge, &scene_usb_uart->state);
+        gpio_usb_uart_update_state(
+            app->gpio_usb_uart, &scene_usb_uart->cfg, &scene_usb_uart->state);
+        if(tx_cnt_last != scene_usb_uart->state.tx_cnt)
+            notification_message(app->notifications, &sequence_blink_blue_10);
+        if(rx_cnt_last != scene_usb_uart->state.rx_cnt)
+            notification_message(app->notifications, &sequence_blink_green_10);
+    }
+    return false;
+}
+
+void gpio_scene_usb_uart_on_exit(void* context) {
+    GpioApp* app = context;
+    uint32_t prev_state = scene_manager_get_scene_state(app->scene_manager, GpioSceneUsbUart);
+    if(prev_state == 0) {
+        usb_uart_disable(app->usb_uart_bridge);
+        free(scene_usb_uart);
+    }
+    notification_message(app->notifications, &sequence_display_backlight_enforce_auto);
+}

applications/main/gpio/scenes/gpio_scene_usb_uart_close_rpc.c

@@ -0,0 +1,41 @@
+#include "../gpio_app_i.h"
+#include "../gpio_custom_event.h"
+
+void gpio_scene_usb_uart_close_rpc_on_enter(void* context) {
+    GpioApp* app = context;
+
+    widget_add_icon_element(app->widget, 78, 0, &I_ActiveConnection_50x64);
+    widget_add_string_multiline_element(
+        app->widget, 3, 2, AlignLeft, AlignTop, FontPrimary, "Connection\nis active!");
+    widget_add_string_multiline_element(
+        app->widget,
+        3,
+        30,
+        AlignLeft,
+        AlignTop,
+        FontSecondary,
+        "Disconnect from\nPC or phone to\nuse this function.");
+
+    view_dispatcher_switch_to_view(app->view_dispatcher, GpioAppViewUsbUartCloseRpc);
+}
+
+bool gpio_scene_usb_uart_close_rpc_on_event(void* context, SceneManagerEvent event) {
+    GpioApp* app = context;
+    bool consumed = false;
+
+    if(event.type == SceneManagerEventTypeCustom) {
+        if(event.event == GpioCustomEventErrorBack) {
+            if(!scene_manager_previous_scene(app->scene_manager)) {
+                scene_manager_stop(app->scene_manager);
+                view_dispatcher_stop(app->view_dispatcher);
+            }
+            consumed = true;
+        }
+    }
+    return consumed;
+}
+
+void gpio_scene_usb_uart_close_rpc_on_exit(void* context) {
+    GpioApp* app = context;
+    widget_reset(app->widget);
+}

applications/main/gpio/scenes/gpio_scene_usb_uart_config.c

@@ -0,0 +1,137 @@
+#include "../usb_uart_bridge.h"
+#include "../gpio_app_i.h"
+#include "furi_hal.h"
+
+typedef enum {
+    UsbUartLineIndexVcp,
+    UsbUartLineIndexBaudrate,
+    UsbUartLineIndexUart,
+    UsbUartLineIndexFlow,
+} LineIndex;
+
+static UsbUartConfig* cfg_set;
+
+static const char* vcp_ch[] = {"0 (CLI)", "1"};
+static const char* uart_ch[] = {"13,14", "15,16"};
+static const char* flow_pins[] = {"None", "2,3", "6,7"};
+static const char* baudrate_mode[] = {"Host"};
+static const uint32_t baudrate_list[] = {
+    2400,
+    9600,
+    19200,
+    38400,
+    57600,
+    115200,
+    230400,
+    460800,
+    921600,
+};
+
+bool gpio_scene_usb_uart_cfg_on_event(void* context, SceneManagerEvent event) {
+    UNUSED(context);
+    UNUSED(event);
+    return false;
+}
+
+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]);
+
+    cfg_set->vcp_ch = index;
+    usb_uart_set_config(app->usb_uart_bridge, cfg_set);
+}
+
+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]);
+
+    if(index == 0)
+        cfg_set->uart_ch = FuriHalUartIdUSART1;
+    else if(index == 1)
+        cfg_set->uart_ch = FuriHalUartIdLPUART1;
+    usb_uart_set_config(app->usb_uart_bridge, cfg_set);
+}
+
+static void line_flow_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, flow_pins[index]);
+
+    cfg_set->flow_pins = index;
+    usb_uart_set_config(app->usb_uart_bridge, cfg_set);
+}
+
+static void line_baudrate_cb(VariableItem* item) {
+    GpioApp* app = variable_item_get_context(item);
+    uint8_t index = variable_item_get_current_value_index(item);
+
+    char br_text[8];
+
+    if(index > 0) {
+        snprintf(br_text, 7, "%lu", baudrate_list[index - 1]);
+        variable_item_set_current_value_text(item, br_text);
+        cfg_set->baudrate = baudrate_list[index - 1];
+    } else {
+        variable_item_set_current_value_text(item, baudrate_mode[index]);
+        cfg_set->baudrate = 0;
+    }
+    cfg_set->baudrate_mode = index;
+    usb_uart_set_config(app->usb_uart_bridge, cfg_set);
+}
+
+void gpio_scene_usb_uart_cfg_on_enter(void* context) {
+    GpioApp* app = context;
+    VariableItemList* var_item_list = app->var_item_list;
+
+    cfg_set = malloc(sizeof(UsbUartConfig));
+    usb_uart_get_config(app->usb_uart_bridge, cfg_set);
+
+    VariableItem* item;
+    char br_text[8];
+
+    item = variable_item_list_add(var_item_list, "USB Channel", 2, line_vcp_cb, app);
+    variable_item_set_current_value_index(item, cfg_set->vcp_ch);
+    variable_item_set_current_value_text(item, vcp_ch[cfg_set->vcp_ch]);
+
+    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, cfg_set->baudrate_mode);
+    if(cfg_set->baudrate_mode > 0) {
+        snprintf(br_text, 7, "%lu", baudrate_list[cfg_set->baudrate_mode - 1]);
+        variable_item_set_current_value_text(item, br_text);
+    } else {
+        variable_item_set_current_value_text(item, baudrate_mode[cfg_set->baudrate_mode]);
+    }
+
+    item = variable_item_list_add(var_item_list, "UART Pins", 2, line_port_cb, app);
+    variable_item_set_current_value_index(item, cfg_set->uart_ch);
+    variable_item_set_current_value_text(item, uart_ch[cfg_set->uart_ch]);
+
+    item = variable_item_list_add(var_item_list, "RTS/DTR Pins", 3, line_flow_cb, app);
+    variable_item_set_current_value_index(item, cfg_set->flow_pins);
+    variable_item_set_current_value_text(item, flow_pins[cfg_set->flow_pins]);
+
+    variable_item_list_set_selected_item(
+        var_item_list, scene_manager_get_scene_state(app->scene_manager, GpioAppViewUsbUartCfg));
+
+    view_dispatcher_switch_to_view(app->view_dispatcher, GpioAppViewUsbUartCfg);
+}
+
+void gpio_scene_usb_uart_cfg_on_exit(void* context) {
+    GpioApp* app = context;
+    scene_manager_set_scene_state(
+        app->scene_manager,
+        GpioAppViewUsbUartCfg,
+        variable_item_list_get_selected_item_index(app->var_item_list));
+    variable_item_list_reset(app->var_item_list);
+    free(cfg_set);
+}

applications/main/gpio/usb_uart_bridge.c

@@ -0,0 +1,378 @@
+#include "usb_uart_bridge.h"
+#include "furi_hal.h"
+#include <stream_buffer.h>
+#include <furi_hal_usb_cdc.h>
+#include "usb_cdc.h"
+#include "cli/cli_vcp.h"
+#include "cli/cli.h"
+
+#define USB_CDC_PKT_LEN CDC_DATA_SZ
+#define USB_UART_RX_BUF_SIZE (USB_CDC_PKT_LEN * 5)
+
+#define USB_CDC_BIT_DTR (1 << 0)
+#define USB_CDC_BIT_RTS (1 << 1)
+
+static const GpioPin* flow_pins[][2] = {
+    {&gpio_ext_pa7, &gpio_ext_pa6}, // 2, 3
+    {&gpio_ext_pb2, &gpio_ext_pc3}, // 6, 7
+};
+
+typedef enum {
+    WorkerEvtStop = (1 << 0),
+    WorkerEvtRxDone = (1 << 1),
+
+    WorkerEvtTxStop = (1 << 2),
+    WorkerEvtCdcRx = (1 << 3),
+
+    WorkerEvtCfgChange = (1 << 4),
+
+    WorkerEvtLineCfgSet = (1 << 5),
+    WorkerEvtCtrlLineSet = (1 << 6),
+
+} WorkerEvtFlags;
+
+#define WORKER_ALL_RX_EVENTS                                                      \
+    (WorkerEvtStop | WorkerEvtRxDone | WorkerEvtCfgChange | WorkerEvtLineCfgSet | \
+     WorkerEvtCtrlLineSet)
+#define WORKER_ALL_TX_EVENTS (WorkerEvtTxStop | WorkerEvtCdcRx)
+
+struct UsbUartBridge {
+    UsbUartConfig cfg;
+    UsbUartConfig cfg_new;
+
+    FuriThread* thread;
+    FuriThread* tx_thread;
+
+    StreamBufferHandle_t rx_stream;
+
+    FuriMutex* usb_mutex;
+
+    FuriSemaphore* tx_sem;
+
+    UsbUartState st;
+
+    uint8_t rx_buf[USB_CDC_PKT_LEN];
+};
+
+static void vcp_on_cdc_tx_complete(void* context);
+static void vcp_on_cdc_rx(void* context);
+static void vcp_state_callback(void* context, uint8_t state);
+static void vcp_on_cdc_control_line(void* context, uint8_t state);
+static void vcp_on_line_config(void* context, struct usb_cdc_line_coding* config);
+
+static const 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 int32_t usb_uart_tx_thread(void* context);
+
+static void usb_uart_on_irq_cb(UartIrqEvent ev, uint8_t data, void* context) {
+    UsbUartBridge* usb_uart = (UsbUartBridge*)context;
+    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
+
+    if(ev == UartIrqEventRXNE) {
+        xStreamBufferSendFromISR(usb_uart->rx_stream, &data, 1, &xHigherPriorityTaskWoken);
+        furi_thread_flags_set(furi_thread_get_id(usb_uart->thread), WorkerEvtRxDone);
+        portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
+    }
+}
+
+static void usb_uart_vcp_init(UsbUartBridge* usb_uart, uint8_t vcp_ch) {
+    furi_hal_usb_unlock();
+    if(vcp_ch == 0) {
+        Cli* cli = furi_record_open(RECORD_CLI);
+        cli_session_close(cli);
+        furi_record_close(RECORD_CLI);
+        furi_check(furi_hal_usb_set_config(&usb_cdc_single, NULL) == true);
+    } else {
+        furi_check(furi_hal_usb_set_config(&usb_cdc_dual, NULL) == true);
+        Cli* cli = furi_record_open(RECORD_CLI);
+        cli_session_open(cli, &cli_vcp);
+        furi_record_close(RECORD_CLI);
+    }
+    furi_hal_cdc_set_callbacks(vcp_ch, (CdcCallbacks*)&cdc_cb, usb_uart);
+}
+
+static void usb_uart_vcp_deinit(UsbUartBridge* usb_uart, uint8_t vcp_ch) {
+    UNUSED(usb_uart);
+    furi_hal_cdc_set_callbacks(vcp_ch, NULL, NULL);
+    if(vcp_ch != 0) {
+        Cli* cli = furi_record_open(RECORD_CLI);
+        cli_session_close(cli);
+        furi_record_close(RECORD_CLI);
+    }
+}
+
+static void usb_uart_serial_init(UsbUartBridge* usb_uart, uint8_t uart_ch) {
+    if(uart_ch == FuriHalUartIdUSART1) {
+        furi_hal_console_disable();
+    } else if(uart_ch == FuriHalUartIdLPUART1) {
+        furi_hal_uart_init(uart_ch, 115200);
+    }
+    furi_hal_uart_set_irq_cb(uart_ch, usb_uart_on_irq_cb, usb_uart);
+}
+
+static void usb_uart_serial_deinit(UsbUartBridge* usb_uart, uint8_t uart_ch) {
+    UNUSED(usb_uart);
+    furi_hal_uart_set_irq_cb(uart_ch, NULL, NULL);
+    if(uart_ch == FuriHalUartIdUSART1)
+        furi_hal_console_enable();
+    else if(uart_ch == FuriHalUartIdLPUART1)
+        furi_hal_uart_deinit(uart_ch);
+}
+
+static void usb_uart_set_baudrate(UsbUartBridge* usb_uart, uint32_t baudrate) {
+    if(baudrate != 0) {
+        furi_hal_uart_set_br(usb_uart->cfg.uart_ch, baudrate);
+        usb_uart->st.baudrate_cur = baudrate;
+    } else {
+        struct usb_cdc_line_coding* line_cfg =
+            furi_hal_cdc_get_port_settings(usb_uart->cfg.vcp_ch);
+        if(line_cfg->dwDTERate > 0) {
+            furi_hal_uart_set_br(usb_uart->cfg.uart_ch, line_cfg->dwDTERate);
+            usb_uart->st.baudrate_cur = line_cfg->dwDTERate;
+        }
+    }
+}
+
+static void usb_uart_update_ctrl_lines(UsbUartBridge* usb_uart) {
+    if(usb_uart->cfg.flow_pins != 0) {
+        furi_assert((size_t)(usb_uart->cfg.flow_pins - 1) < COUNT_OF(flow_pins));
+        uint8_t state = furi_hal_cdc_get_ctrl_line_state(usb_uart->cfg.vcp_ch);
+
+        furi_hal_gpio_write(flow_pins[usb_uart->cfg.flow_pins - 1][0], !(state & USB_CDC_BIT_RTS));
+        furi_hal_gpio_write(flow_pins[usb_uart->cfg.flow_pins - 1][1], !(state & USB_CDC_BIT_DTR));
+    }
+}
+
+static int32_t usb_uart_worker(void* context) {
+    UsbUartBridge* usb_uart = (UsbUartBridge*)context;
+
+    memcpy(&usb_uart->cfg, &usb_uart->cfg_new, sizeof(UsbUartConfig));
+
+    usb_uart->rx_stream = xStreamBufferCreate(USB_UART_RX_BUF_SIZE, 1);
+
+    usb_uart->tx_sem = furi_semaphore_alloc(1, 1);
+    usb_uart->usb_mutex = furi_mutex_alloc(FuriMutexTypeNormal);
+
+    usb_uart->tx_thread = furi_thread_alloc();
+    furi_thread_set_name(usb_uart->tx_thread, "UsbUartTxWorker");
+    furi_thread_set_stack_size(usb_uart->tx_thread, 512);
+    furi_thread_set_context(usb_uart->tx_thread, usb_uart);
+    furi_thread_set_callback(usb_uart->tx_thread, usb_uart_tx_thread);
+
+    usb_uart_vcp_init(usb_uart, usb_uart->cfg.vcp_ch);
+    usb_uart_serial_init(usb_uart, usb_uart->cfg.uart_ch);
+    usb_uart_set_baudrate(usb_uart, usb_uart->cfg.baudrate);
+    if(usb_uart->cfg.flow_pins != 0) {
+        furi_assert((size_t)(usb_uart->cfg.flow_pins - 1) < COUNT_OF(flow_pins));
+        furi_hal_gpio_init_simple(
+            flow_pins[usb_uart->cfg.flow_pins - 1][0], GpioModeOutputPushPull);
+        furi_hal_gpio_init_simple(
+            flow_pins[usb_uart->cfg.flow_pins - 1][1], GpioModeOutputPushPull);
+        usb_uart_update_ctrl_lines(usb_uart);
+    }
+
+    furi_thread_flags_set(furi_thread_get_id(usb_uart->tx_thread), WorkerEvtCdcRx);
+
+    furi_thread_start(usb_uart->tx_thread);
+
+    while(1) {
+        uint32_t events =
+            furi_thread_flags_wait(WORKER_ALL_RX_EVENTS, FuriFlagWaitAny, FuriWaitForever);
+        furi_check((events & FuriFlagError) == 0);
+        if(events & WorkerEvtStop) break;
+        if(events & WorkerEvtRxDone) {
+            size_t len =
+                xStreamBufferReceive(usb_uart->rx_stream, usb_uart->rx_buf, USB_CDC_PKT_LEN, 0);
+            if(len > 0) {
+                if(furi_semaphore_acquire(usb_uart->tx_sem, 100) == FuriStatusOk) {
+                    usb_uart->st.rx_cnt += len;
+                    furi_check(
+                        furi_mutex_acquire(usb_uart->usb_mutex, FuriWaitForever) == FuriStatusOk);
+                    furi_hal_cdc_send(usb_uart->cfg.vcp_ch, usb_uart->rx_buf, len);
+                    furi_check(furi_mutex_release(usb_uart->usb_mutex) == FuriStatusOk);
+                } else {
+                    xStreamBufferReset(usb_uart->rx_stream);
+                }
+            }
+        }
+        if(events & WorkerEvtCfgChange) {
+            if(usb_uart->cfg.vcp_ch != usb_uart->cfg_new.vcp_ch) {
+                furi_thread_flags_set(furi_thread_get_id(usb_uart->tx_thread), WorkerEvtTxStop);
+                furi_thread_join(usb_uart->tx_thread);
+
+                usb_uart_vcp_deinit(usb_uart, usb_uart->cfg.vcp_ch);
+                usb_uart_vcp_init(usb_uart, usb_uart->cfg_new.vcp_ch);
+
+                usb_uart->cfg.vcp_ch = usb_uart->cfg_new.vcp_ch;
+                furi_thread_start(usb_uart->tx_thread);
+                events |= WorkerEvtCtrlLineSet;
+                events |= WorkerEvtLineCfgSet;
+            }
+            if(usb_uart->cfg.uart_ch != usb_uart->cfg_new.uart_ch) {
+                furi_thread_flags_set(furi_thread_get_id(usb_uart->tx_thread), WorkerEvtTxStop);
+                furi_thread_join(usb_uart->tx_thread);
+
+                usb_uart_serial_deinit(usb_uart, usb_uart->cfg.uart_ch);
+                usb_uart_serial_init(usb_uart, usb_uart->cfg_new.uart_ch);
+
+                usb_uart->cfg.uart_ch = usb_uart->cfg_new.uart_ch;
+                usb_uart_set_baudrate(usb_uart, usb_uart->cfg.baudrate);
+
+                furi_thread_start(usb_uart->tx_thread);
+            }
+            if(usb_uart->cfg.baudrate != usb_uart->cfg_new.baudrate) {
+                usb_uart_set_baudrate(usb_uart, usb_uart->cfg_new.baudrate);
+                usb_uart->cfg.baudrate = usb_uart->cfg_new.baudrate;
+            }
+            if(usb_uart->cfg.flow_pins != usb_uart->cfg_new.flow_pins) {
+                if(usb_uart->cfg.flow_pins != 0) {
+                    furi_hal_gpio_init_simple(
+                        flow_pins[usb_uart->cfg.flow_pins - 1][0], GpioModeAnalog);
+                    furi_hal_gpio_init_simple(
+                        flow_pins[usb_uart->cfg.flow_pins - 1][1], GpioModeAnalog);
+                }
+                if(usb_uart->cfg_new.flow_pins != 0) {
+                    furi_assert((size_t)(usb_uart->cfg_new.flow_pins - 1) < COUNT_OF(flow_pins));
+                    furi_hal_gpio_init_simple(
+                        flow_pins[usb_uart->cfg_new.flow_pins - 1][0], GpioModeOutputPushPull);
+                    furi_hal_gpio_init_simple(
+                        flow_pins[usb_uart->cfg_new.flow_pins - 1][1], GpioModeOutputPushPull);
+                }
+                usb_uart->cfg.flow_pins = usb_uart->cfg_new.flow_pins;
+                events |= WorkerEvtCtrlLineSet;
+            }
+        }
+        if(events & WorkerEvtLineCfgSet) {
+            if(usb_uart->cfg.baudrate == 0)
+                usb_uart_set_baudrate(usb_uart, usb_uart->cfg.baudrate);
+        }
+        if(events & WorkerEvtCtrlLineSet) {
+            usb_uart_update_ctrl_lines(usb_uart);
+        }
+    }
+    usb_uart_vcp_deinit(usb_uart, usb_uart->cfg.vcp_ch);
+    usb_uart_serial_deinit(usb_uart, usb_uart->cfg.uart_ch);
+
+    if(usb_uart->cfg.flow_pins != 0) {
+        furi_hal_gpio_init_simple(flow_pins[usb_uart->cfg.flow_pins - 1][0], GpioModeAnalog);
+        furi_hal_gpio_init_simple(flow_pins[usb_uart->cfg.flow_pins - 1][1], GpioModeAnalog);
+    }
+
+    furi_thread_flags_set(furi_thread_get_id(usb_uart->tx_thread), WorkerEvtTxStop);
+    furi_thread_join(usb_uart->tx_thread);
+    furi_thread_free(usb_uart->tx_thread);
+
+    vStreamBufferDelete(usb_uart->rx_stream);
+    furi_mutex_free(usb_uart->usb_mutex);
+    furi_semaphore_free(usb_uart->tx_sem);
+
+    furi_hal_usb_unlock();
+    furi_check(furi_hal_usb_set_config(&usb_cdc_single, NULL) == true);
+    Cli* cli = furi_record_open(RECORD_CLI);
+    cli_session_open(cli, &cli_vcp);
+    furi_record_close(RECORD_CLI);
+
+    return 0;
+}
+
+static int32_t usb_uart_tx_thread(void* context) {
+    UsbUartBridge* usb_uart = (UsbUartBridge*)context;
+
+    uint8_t data[USB_CDC_PKT_LEN];
+    while(1) {
+        uint32_t events =
+            furi_thread_flags_wait(WORKER_ALL_TX_EVENTS, FuriFlagWaitAny, FuriWaitForever);
+        furi_check((events & FuriFlagError) == 0);
+        if(events & WorkerEvtTxStop) break;
+        if(events & WorkerEvtCdcRx) {
+            furi_check(furi_mutex_acquire(usb_uart->usb_mutex, FuriWaitForever) == FuriStatusOk);
+            size_t len = furi_hal_cdc_receive(usb_uart->cfg.vcp_ch, data, USB_CDC_PKT_LEN);
+            furi_check(furi_mutex_release(usb_uart->usb_mutex) == FuriStatusOk);
+
+            if(len > 0) {
+                usb_uart->st.tx_cnt += len;
+                furi_hal_uart_tx(usb_uart->cfg.uart_ch, data, len);
+            }
+        }
+    }
+    return 0;
+}
+
+/* VCP callbacks */
+
+static void vcp_on_cdc_tx_complete(void* context) {
+    UsbUartBridge* usb_uart = (UsbUartBridge*)context;
+    furi_semaphore_release(usb_uart->tx_sem);
+}
+
+static void vcp_on_cdc_rx(void* context) {
+    UsbUartBridge* usb_uart = (UsbUartBridge*)context;
+    furi_thread_flags_set(furi_thread_get_id(usb_uart->tx_thread), WorkerEvtCdcRx);
+}
+
+static void vcp_state_callback(void* context, uint8_t state) {
+    UNUSED(context);
+    UNUSED(state);
+}
+
+static void vcp_on_cdc_control_line(void* context, uint8_t state) {
+    UNUSED(state);
+    UsbUartBridge* usb_uart = (UsbUartBridge*)context;
+    furi_thread_flags_set(furi_thread_get_id(usb_uart->thread), WorkerEvtCtrlLineSet);
+}
+
+static void vcp_on_line_config(void* context, struct usb_cdc_line_coding* config) {
+    UNUSED(config);
+    UsbUartBridge* usb_uart = (UsbUartBridge*)context;
+    furi_thread_flags_set(furi_thread_get_id(usb_uart->thread), WorkerEvtLineCfgSet);
+}
+
+UsbUartBridge* usb_uart_enable(UsbUartConfig* cfg) {
+    UsbUartBridge* usb_uart = malloc(sizeof(UsbUartBridge));
+
+    memcpy(&(usb_uart->cfg_new), cfg, sizeof(UsbUartConfig));
+
+    usb_uart->thread = furi_thread_alloc();
+    furi_thread_set_name(usb_uart->thread, "UsbUartWorker");
+    furi_thread_set_stack_size(usb_uart->thread, 1024);
+    furi_thread_set_context(usb_uart->thread, usb_uart);
+    furi_thread_set_callback(usb_uart->thread, usb_uart_worker);
+
+    furi_thread_start(usb_uart->thread);
+    return usb_uart;
+}
+
+void usb_uart_disable(UsbUartBridge* usb_uart) {
+    furi_assert(usb_uart);
+    furi_thread_flags_set(furi_thread_get_id(usb_uart->thread), WorkerEvtStop);
+    furi_thread_join(usb_uart->thread);
+    furi_thread_free(usb_uart->thread);
+    free(usb_uart);
+}
+
+void usb_uart_set_config(UsbUartBridge* usb_uart, UsbUartConfig* cfg) {
+    furi_assert(usb_uart);
+    furi_assert(cfg);
+    memcpy(&(usb_uart->cfg_new), cfg, sizeof(UsbUartConfig));
+    furi_thread_flags_set(furi_thread_get_id(usb_uart->thread), WorkerEvtCfgChange);
+}
+
+void usb_uart_get_config(UsbUartBridge* usb_uart, UsbUartConfig* cfg) {
+    furi_assert(usb_uart);
+    furi_assert(cfg);
+    memcpy(cfg, &(usb_uart->cfg_new), sizeof(UsbUartConfig));
+}
+
+void usb_uart_get_state(UsbUartBridge* usb_uart, UsbUartState* st) {
+    furi_assert(usb_uart);
+    furi_assert(st);
+    memcpy(st, &(usb_uart->st), sizeof(UsbUartState));
+}

applications/main/gpio/usb_uart_bridge.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef struct UsbUartBridge UsbUartBridge;
+
+typedef struct {
+    uint8_t vcp_ch;
+    uint8_t uart_ch;
+    uint8_t flow_pins;
+    uint8_t baudrate_mode;
+    uint32_t baudrate;
+} UsbUartConfig;
+
+typedef struct {
+    uint32_t rx_cnt;
+    uint32_t tx_cnt;
+    uint32_t baudrate_cur;
+} UsbUartState;
+
+UsbUartBridge* usb_uart_enable(UsbUartConfig* cfg);
+
+void usb_uart_disable(UsbUartBridge* usb_uart);
+
+void usb_uart_set_config(UsbUartBridge* usb_uart, UsbUartConfig* cfg);
+
+void usb_uart_get_config(UsbUartBridge* usb_uart, UsbUartConfig* cfg);
+
+void usb_uart_get_state(UsbUartBridge* usb_uart, UsbUartState* st);

applications/main/gpio/views/gpio_test.c

@@ -0,0 +1,131 @@
+#include "gpio_test.h"
+#include "../gpio_item.h"
+
+#include <gui/elements.h>
+
+struct GpioTest {
+    View* view;
+    GpioTestOkCallback callback;
+    void* context;
+};
+
+typedef struct {
+    uint8_t pin_idx;
+} GpioTestModel;
+
+static bool gpio_test_process_left(GpioTest* gpio_test);
+static bool gpio_test_process_right(GpioTest* gpio_test);
+static bool gpio_test_process_ok(GpioTest* gpio_test, InputEvent* event);
+
+static void gpio_test_draw_callback(Canvas* canvas, void* _model) {
+    GpioTestModel* model = _model;
+    canvas_set_font(canvas, FontPrimary);
+    elements_multiline_text_aligned(canvas, 64, 2, AlignCenter, AlignTop, "GPIO Output Mode Test");
+    canvas_set_font(canvas, FontSecondary);
+    elements_multiline_text_aligned(
+        canvas, 64, 16, AlignCenter, AlignTop, "Press < or > to change pin");
+    elements_multiline_text_aligned(
+        canvas, 64, 32, AlignCenter, AlignTop, gpio_item_get_pin_name(model->pin_idx));
+}
+
+static bool gpio_test_input_callback(InputEvent* event, void* context) {
+    furi_assert(context);
+    GpioTest* gpio_test = context;
+    bool consumed = false;
+
+    if(event->type == InputTypeShort) {
+        if(event->key == InputKeyRight) {
+            consumed = gpio_test_process_right(gpio_test);
+        } else if(event->key == InputKeyLeft) {
+            consumed = gpio_test_process_left(gpio_test);
+        }
+    } else if(event->key == InputKeyOk) {
+        consumed = gpio_test_process_ok(gpio_test, event);
+    }
+
+    return consumed;
+}
+
+static bool gpio_test_process_left(GpioTest* gpio_test) {
+    with_view_model(
+        gpio_test->view, (GpioTestModel * model) {
+            if(model->pin_idx) {
+                model->pin_idx--;
+            }
+            return true;
+        });
+    return true;
+}
+
+static bool gpio_test_process_right(GpioTest* gpio_test) {
+    with_view_model(
+        gpio_test->view, (GpioTestModel * model) {
+            if(model->pin_idx < GPIO_ITEM_COUNT) {
+                model->pin_idx++;
+            }
+            return true;
+        });
+    return true;
+}
+
+static bool gpio_test_process_ok(GpioTest* gpio_test, InputEvent* event) {
+    bool consumed = false;
+
+    with_view_model(
+        gpio_test->view, (GpioTestModel * model) {
+            if(event->type == InputTypePress) {
+                if(model->pin_idx < GPIO_ITEM_COUNT) {
+                    gpio_item_set_pin(model->pin_idx, true);
+                } else {
+                    gpio_item_set_all_pins(true);
+                }
+                consumed = true;
+            } else if(event->type == InputTypeRelease) {
+                if(model->pin_idx < GPIO_ITEM_COUNT) {
+                    gpio_item_set_pin(model->pin_idx, false);
+                } else {
+                    gpio_item_set_all_pins(false);
+                }
+                consumed = true;
+            }
+            gpio_test->callback(event->type, gpio_test->context);
+            return true;
+        });
+
+    return consumed;
+}
+
+GpioTest* gpio_test_alloc() {
+    GpioTest* gpio_test = malloc(sizeof(GpioTest));
+
+    gpio_test->view = view_alloc();
+    view_allocate_model(gpio_test->view, ViewModelTypeLocking, sizeof(GpioTestModel));
+    view_set_context(gpio_test->view, gpio_test);
+    view_set_draw_callback(gpio_test->view, gpio_test_draw_callback);
+    view_set_input_callback(gpio_test->view, gpio_test_input_callback);
+
+    return gpio_test;
+}
+
+void gpio_test_free(GpioTest* gpio_test) {
+    furi_assert(gpio_test);
+    view_free(gpio_test->view);
+    free(gpio_test);
+}
+
+View* gpio_test_get_view(GpioTest* gpio_test) {
+    furi_assert(gpio_test);
+    return gpio_test->view;
+}
+
+void gpio_test_set_ok_callback(GpioTest* gpio_test, GpioTestOkCallback callback, void* context) {
+    furi_assert(gpio_test);
+    furi_assert(callback);
+    with_view_model(
+        gpio_test->view, (GpioTestModel * model) {
+            UNUSED(model);
+            gpio_test->callback = callback;
+            gpio_test->context = context;
+            return false;
+        });
+}

applications/main/gpio/views/gpio_test.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <gui/view.h>
+
+typedef struct GpioTest GpioTest;
+typedef void (*GpioTestOkCallback)(InputType type, void* context);
+
+GpioTest* gpio_test_alloc();
+
+void gpio_test_free(GpioTest* gpio_test);
+
+View* gpio_test_get_view(GpioTest* gpio_test);
+
+void gpio_test_set_ok_callback(GpioTest* gpio_test, GpioTestOkCallback callback, void* context);

applications/main/gpio/views/gpio_usb_uart.c

@@ -0,0 +1,157 @@
+#include "../usb_uart_bridge.h"
+#include "../gpio_app_i.h"
+#include "furi_hal.h"
+#include <gui/elements.h>
+
+struct GpioUsbUart {
+    View* view;
+    GpioUsbUartCallback callback;
+    void* context;
+};
+
+typedef struct {
+    uint32_t baudrate;
+    uint32_t tx_cnt;
+    uint32_t rx_cnt;
+    uint8_t vcp_port;
+    uint8_t tx_pin;
+    uint8_t rx_pin;
+    bool tx_active;
+    bool rx_active;
+} GpioUsbUartModel;
+
+static void gpio_usb_uart_draw_callback(Canvas* canvas, void* _model) {
+    GpioUsbUartModel* model = _model;
+    char temp_str[18];
+    elements_button_left(canvas, "Config");
+    canvas_draw_line(canvas, 2, 10, 125, 10);
+    canvas_draw_line(canvas, 44, 52, 123, 52);
+
+    canvas_set_font(canvas, FontPrimary);
+    canvas_draw_str(canvas, 2, 9, "USB Serial");
+    canvas_draw_str(canvas, 3, 25, "TX:");
+    canvas_draw_str(canvas, 3, 42, "RX:");
+
+    canvas_set_font(canvas, FontSecondary);
+    snprintf(temp_str, 18, "COM PORT:%u", model->vcp_port);
+    canvas_draw_str_aligned(canvas, 126, 8, AlignRight, AlignBottom, temp_str);
+    snprintf(temp_str, 18, "Pin %u", model->tx_pin);
+    canvas_draw_str(canvas, 22, 25, temp_str);
+    snprintf(temp_str, 18, "Pin %u", model->rx_pin);
+    canvas_draw_str(canvas, 22, 42, temp_str);
+
+    if(model->baudrate == 0)
+        snprintf(temp_str, 18, "Baud: ????");
+    else
+        snprintf(temp_str, 18, "Baud: %lu", model->baudrate);
+    canvas_draw_str(canvas, 45, 62, temp_str);
+
+    if(model->tx_cnt < 100000000) {
+        canvas_set_font(canvas, FontSecondary);
+        canvas_draw_str_aligned(canvas, 127, 24, AlignRight, AlignBottom, "B.");
+        canvas_set_font(canvas, FontKeyboard);
+        snprintf(temp_str, 18, "%lu", model->tx_cnt);
+        canvas_draw_str_aligned(canvas, 116, 24, AlignRight, AlignBottom, temp_str);
+    } else {
+        canvas_set_font(canvas, FontSecondary);
+        canvas_draw_str_aligned(canvas, 127, 24, AlignRight, AlignBottom, "KB.");
+        canvas_set_font(canvas, FontKeyboard);
+        snprintf(temp_str, 18, "%lu", model->tx_cnt / 1024);
+        canvas_draw_str_aligned(canvas, 111, 24, AlignRight, AlignBottom, temp_str);
+    }
+
+    if(model->rx_cnt < 100000000) {
+        canvas_set_font(canvas, FontSecondary);
+        canvas_draw_str_aligned(canvas, 127, 41, AlignRight, AlignBottom, "B.");
+        canvas_set_font(canvas, FontKeyboard);
+        snprintf(temp_str, 18, "%lu", model->rx_cnt);
+        canvas_draw_str_aligned(canvas, 116, 41, AlignRight, AlignBottom, temp_str);
+    } else {
+        canvas_set_font(canvas, FontSecondary);
+        canvas_draw_str_aligned(canvas, 127, 41, AlignRight, AlignBottom, "KB.");
+        canvas_set_font(canvas, FontKeyboard);
+        snprintf(temp_str, 18, "%lu", model->rx_cnt / 1024);
+        canvas_draw_str_aligned(canvas, 111, 41, AlignRight, AlignBottom, temp_str);
+    }
+
+    if(model->tx_active)
+        canvas_draw_icon(canvas, 48, 14, &I_ArrowUpFilled_14x15);
+    else
+        canvas_draw_icon(canvas, 48, 14, &I_ArrowUpEmpty_14x15);
+
+    if(model->rx_active)
+        canvas_draw_icon(canvas, 48, 34, &I_ArrowDownFilled_14x15);
+    else
+        canvas_draw_icon(canvas, 48, 34, &I_ArrowDownEmpty_14x15);
+}
+
+static bool gpio_usb_uart_input_callback(InputEvent* event, void* context) {
+    furi_assert(context);
+    GpioUsbUart* usb_uart = context;
+    bool consumed = false;
+
+    if(event->type == InputTypeShort) {
+        if(event->key == InputKeyLeft) {
+            consumed = true;
+            furi_assert(usb_uart->callback);
+            usb_uart->callback(GpioUsbUartEventConfig, usb_uart->context);
+        }
+    }
+
+    return consumed;
+}
+
+GpioUsbUart* gpio_usb_uart_alloc() {
+    GpioUsbUart* usb_uart = malloc(sizeof(GpioUsbUart));
+
+    usb_uart->view = view_alloc();
+    view_allocate_model(usb_uart->view, ViewModelTypeLocking, sizeof(GpioUsbUartModel));
+    view_set_context(usb_uart->view, usb_uart);
+    view_set_draw_callback(usb_uart->view, gpio_usb_uart_draw_callback);
+    view_set_input_callback(usb_uart->view, gpio_usb_uart_input_callback);
+
+    return usb_uart;
+}
+
+void gpio_usb_uart_free(GpioUsbUart* usb_uart) {
+    furi_assert(usb_uart);
+    view_free(usb_uart->view);
+    free(usb_uart);
+}
+
+View* gpio_usb_uart_get_view(GpioUsbUart* usb_uart) {
+    furi_assert(usb_uart);
+    return usb_uart->view;
+}
+
+void gpio_usb_uart_set_callback(GpioUsbUart* usb_uart, GpioUsbUartCallback callback, void* context) {
+    furi_assert(usb_uart);
+    furi_assert(callback);
+
+    with_view_model(
+        usb_uart->view, (GpioUsbUartModel * model) {
+            UNUSED(model);
+            usb_uart->callback = callback;
+            usb_uart->context = context;
+            return false;
+        });
+}
+
+void gpio_usb_uart_update_state(GpioUsbUart* instance, UsbUartConfig* cfg, UsbUartState* st) {
+    furi_assert(instance);
+    furi_assert(cfg);
+    furi_assert(st);
+
+    with_view_model(
+        instance->view, (GpioUsbUartModel * model) {
+            model->baudrate = st->baudrate_cur;
+            model->vcp_port = cfg->vcp_ch;
+            model->tx_pin = (cfg->uart_ch == 0) ? (13) : (15);
+            model->rx_pin = (cfg->uart_ch == 0) ? (14) : (16);
+            model->tx_active = (model->tx_cnt != st->tx_cnt);
+            model->rx_active = (model->rx_cnt != st->rx_cnt);
+            model->tx_cnt = st->tx_cnt;
+            model->rx_cnt = st->rx_cnt;
+            return true;
+        });
+}

applications/main/gpio/views/gpio_usb_uart.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <gui/view.h>
+#include "../gpio_custom_event.h"
+#include "../usb_uart_bridge.h"
+
+typedef struct GpioUsbUart GpioUsbUart;
+typedef void (*GpioUsbUartCallback)(GpioCustomEvent event, void* context);
+
+GpioUsbUart* gpio_usb_uart_alloc();
+
+void gpio_usb_uart_free(GpioUsbUart* usb_uart);
+
+View* gpio_usb_uart_get_view(GpioUsbUart* usb_uart);
+
+void gpio_usb_uart_set_callback(GpioUsbUart* usb_uart, GpioUsbUartCallback callback, void* context);
+
+void gpio_usb_uart_update_state(GpioUsbUart* instance, UsbUartConfig* cfg, UsbUartState* st);