[FL-1984, FL-2004, FL-2010] USB CDC Fixes (#801)

* [FL-1984, FL-2004] USB-UART Fixes, test with high timer task priority
* added forgotten file
* switch from EventFlags to ThreadFlags
* [FL-1984, FL-2010] USB-UART and furi-hal-vcp rework
* Scripts: modernize string formatting.

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

15 files changed, 375 insertions, 265 deletions

diff --git a/applications/gpio/scenes/gpio_scene_start.c b/applications/gpio/scenes/gpio_scene_start.c
index b7d94fe7..df210882 100644
--- a/applications/gpio/scenes/gpio_scene_start.c
+++ b/applications/gpio/scenes/gpio_scene_start.c
@@ -67,6 +67,9 @@ void gpio_scene_start_on_enter(void* context) {
     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);
 
+    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);
 }
 
@@ -80,8 +83,10 @@ bool gpio_scene_start_on_event(void* context, SceneManagerEvent event) {
         } else if(event.event == GPIO_SCENE_START_CUSTOM_EVENT_OTG_OFF) {
             furi_hal_power_disable_otg();
         } else if(event.event == GPIO_SCENE_START_CUSTOM_EVENT_TEST) {
+            scene_manager_set_scene_state(app->scene_manager, GpioSceneStart, 1);
             scene_manager_next_scene(app->scene_manager, GpioSceneTest);
         } else if(event.event == GPIO_SCENE_START_CUSTOM_EVENT_USB_UART) {
+            scene_manager_set_scene_state(app->scene_manager, GpioSceneStart, 2);
             scene_manager_next_scene(app->scene_manager, GpioSceneUsbUart);
         }
         consumed = true;
diff --git a/applications/gpio/scenes/gpio_scene_usb_uart.c b/applications/gpio/scenes/gpio_scene_usb_uart.c
index c8ec0141..b24e4b3e 100644
--- a/applications/gpio/scenes/gpio_scene_usb_uart.c
+++ b/applications/gpio/scenes/gpio_scene_usb_uart.c
@@ -120,12 +120,19 @@ void gpio_scene_usb_uart_on_enter(void* context) {
     item = variable_item_list_add(var_item_list, "Enable", 0, NULL, NULL);
     item = variable_item_list_add(var_item_list, "Disable", 0, NULL, NULL);
 
+    variable_item_list_set_selected_item(
+        var_item_list, scene_manager_get_scene_state(app->scene_manager, GpioSceneUsbUart));
+
     view_dispatcher_switch_to_view(app->view_dispatcher, GpioAppViewUsbUart);
 }
 
 void gpio_scene_usb_uart_on_exit(void* context) {
     GpioApp* app = context;
     usb_uart_disable();
+    scene_manager_set_scene_state(
+        app->scene_manager,
+        GpioSceneUsbUart,
+        variable_item_list_get_selected_item_index(app->var_item_list));
     variable_item_list_clean(app->var_item_list);
     free(cfg_set);
 }
diff --git a/applications/gpio/usb_uart_bridge.c b/applications/gpio/usb_uart_bridge.c
index b50cc158..ff787ea7 100644
--- a/applications/gpio/usb_uart_bridge.c
+++ b/applications/gpio/usb_uart_bridge.c
@@ -4,23 +4,19 @@
 #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)
+#define USB_CDC_PKT_LEN CDC_DATA_SZ
+#define USB_UART_RX_BUF_SIZE (USB_CDC_PKT_LEN * 5)
 
 typedef enum {
     WorkerEvtStop = (1 << 0),
-    WorkerEvtRxReady = (1 << 1),
+    WorkerEvtRxDone = (1 << 1),
 
     WorkerEvtTxStop = (1 << 2),
-    WorkerEvtTxReady = (1 << 3),
-
-    WorkerEvtSof = (1 << 4),
-
+    WorkerEvtCdcRx = (1 << 3),
 } WorkerEvtFlags;
 
-#define WORKER_ALL_RX_EVENTS (WorkerEvtStop | WorkerEvtRxReady)
-#define WORKER_ALL_TX_EVENTS (WorkerEvtTxStop | WorkerEvtTxReady)
+#define WORKER_ALL_RX_EVENTS (WorkerEvtStop | WorkerEvtRxDone)
+#define WORKER_ALL_TX_EVENTS (WorkerEvtTxStop | WorkerEvtCdcRx)
 
 typedef struct {
     UsbUartConfig cfg;
@@ -28,13 +24,13 @@ typedef struct {
     FuriThread* thread;
     FuriThread* tx_thread;
 
-    osEventFlagsId_t events;
-
     StreamBufferHandle_t rx_stream;
-    StreamBufferHandle_t tx_stream;
 
-    uint8_t rx_buf[USB_PKT_LEN];
-    uint8_t tx_buf[USB_PKT_LEN];
+    osMutexId_t usb_mutex;
+
+    osSemaphoreId_t tx_sem;
+
+    uint8_t rx_buf[USB_CDC_PKT_LEN];
 
     bool buf_full;
 } UsbUartParams;
@@ -65,21 +61,18 @@ static void usb_uart_on_irq_cb(UartIrqEvent ev, uint8_t data) {
 
     if(ev == UartIrqEventRXNE) {
         xStreamBufferSendFromISR(usb_uart->rx_stream, &data, 1, &xHigherPriorityTaskWoken);
-
-        size_t ret = xStreamBufferBytesAvailable(usb_uart->rx_stream);
-        if(ret > USB_PKT_LEN) osEventFlagsSet(usb_uart->events, WorkerEvtRxReady);
-    } else if(ev == UartIrqEventIDLE) {
-        osEventFlagsSet(usb_uart->events, WorkerEvtRxReady);
+        portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
+        osThreadFlagsSet(furi_thread_get_thread_id(usb_uart->thread), WorkerEvtRxDone);
     }
-
-    portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
 }
 
 static int32_t usb_uart_worker(void* context) {
     memcpy(&usb_uart->cfg, context, sizeof(UsbUartConfig));
 
     usb_uart->rx_stream = xStreamBufferCreate(USB_UART_RX_BUF_SIZE, 1);
-    usb_uart->tx_stream = xStreamBufferCreate(USB_UART_TX_BUF_SIZE, 1);
+
+    usb_uart->tx_sem = osSemaphoreNew(1, 1, NULL);
+    usb_uart->usb_mutex = osMutexNew(NULL);
 
     usb_uart->tx_thread = furi_thread_alloc();
     furi_thread_set_name(usb_uart->tx_thread, "usb_uart_tx");
@@ -91,10 +84,10 @@ static int32_t usb_uart_worker(void* context) {
     if(usb_uart->cfg.vcp_ch == 0) {
         furi_hal_usb_set_config(UsbModeVcpSingle);
         furi_hal_vcp_disable();
-        osEventFlagsSet(usb_uart->events, WorkerEvtSof);
     } else {
         furi_hal_usb_set_config(UsbModeVcpDual);
     }
+    osThreadFlagsSet(furi_thread_get_thread_id(usb_uart->tx_thread), WorkerEvtCdcRx);
 
     if(usb_uart->cfg.uart_ch == FuriHalUartIdUSART1) {
         furi_hal_console_disable();
@@ -114,26 +107,25 @@ static int32_t usb_uart_worker(void* context) {
     furi_thread_start(usb_uart->tx_thread);
 
     while(1) {
-        uint32_t events = osEventFlagsWait(
-            usb_uart->events, WORKER_ALL_RX_EVENTS, osFlagsWaitAny, osWaitForever);
+        uint32_t events = osThreadFlagsWait(WORKER_ALL_RX_EVENTS, osFlagsWaitAny, osWaitForever);
         furi_check((events & osFlagsError) == 0);
         if(events & WorkerEvtStop) break;
-        if(events & WorkerEvtRxReady) {
-            size_t len = 0;
-            do {
-                len = xStreamBufferReceive(usb_uart->rx_stream, usb_uart->rx_buf, USB_PKT_LEN, 0);
-                if(len > 0) {
-                    if((osEventFlagsWait(usb_uart->events, WorkerEvtSof, osFlagsWaitAny, 100) &
-                        osFlagsError) == 0)
-                        furi_hal_cdc_send(usb_uart->cfg.vcp_ch, usb_uart->rx_buf, len);
-                    else
-                        xStreamBufferReset(usb_uart->rx_stream);
+        if(events & WorkerEvtRxDone) {
+            size_t len =
+                xStreamBufferReceive(usb_uart->rx_stream, usb_uart->rx_buf, USB_CDC_PKT_LEN, 0);
+            if(len > 0) {
+                if(osSemaphoreAcquire(usb_uart->tx_sem, 100) == osOK) {
+                    furi_check(osMutexAcquire(usb_uart->usb_mutex, osWaitForever) == osOK);
+                    furi_hal_cdc_send(usb_uart->cfg.vcp_ch, usb_uart->rx_buf, len);
+                    furi_check(osMutexRelease(usb_uart->usb_mutex) == osOK);
+                } else {
+                    xStreamBufferReset(usb_uart->rx_stream);
                 }
-            } while(len > 0);
+            }
         }
     }
 
-    osEventFlagsSet(usb_uart->events, WorkerEvtTxStop);
+    osThreadFlagsSet(furi_thread_get_thread_id(usb_uart->tx_thread), WorkerEvtTxStop);
     furi_thread_join(usb_uart->tx_thread);
     furi_thread_free(usb_uart->tx_thread);
 
@@ -147,35 +139,26 @@ static int32_t usb_uart_worker(void* context) {
     if(usb_uart->cfg.vcp_ch == 0) furi_hal_vcp_enable();
 
     vStreamBufferDelete(usb_uart->rx_stream);
-    vStreamBufferDelete(usb_uart->tx_stream);
+    osMutexDelete(usb_uart->usb_mutex);
+    osSemaphoreDelete(usb_uart->tx_sem);
 
     return 0;
 }
 
 static int32_t usb_uart_tx_thread(void* context) {
-    uint8_t data[USB_PKT_LEN];
+    uint8_t data[USB_CDC_PKT_LEN];
     while(1) {
-        uint32_t events = osEventFlagsWait(
-            usb_uart->events, WORKER_ALL_TX_EVENTS, osFlagsWaitAny, osWaitForever);
+        uint32_t events = osThreadFlagsWait(WORKER_ALL_TX_EVENTS, osFlagsWaitAny, osWaitForever);
         furi_check((events & osFlagsError) == 0);
         if(events & WorkerEvtTxStop) break;
-        if(events & WorkerEvtTxReady) {
-            size_t len = 0;
-            do {
-                len = xStreamBufferReceive(usb_uart->tx_stream, &data, 1, 0);
-                if(len > 0) {
-                    furi_hal_uart_tx(usb_uart->cfg.uart_ch, data, len);
-                }
-                if((usb_uart->buf_full == true) &&
-                   (xStreamBufferBytesAvailable(usb_uart->tx_stream) == 0)) {
-                    // Stream buffer was overflown, but now is free. Reading USB buffer to resume USB transfers
-                    usb_uart->buf_full = false;
-                    int32_t size = furi_hal_cdc_receive(usb_uart->cfg.vcp_ch, data, USB_PKT_LEN);
-                    if(size > 0) {
-                        furi_hal_uart_tx(usb_uart->cfg.uart_ch, data, size);
-                    }
-                }
-            } while(len > 0);
+        if(events & WorkerEvtCdcRx) {
+            furi_check(osMutexAcquire(usb_uart->usb_mutex, osWaitForever) == osOK);
+            int32_t size = furi_hal_cdc_receive(usb_uart->cfg.vcp_ch, data, USB_CDC_PKT_LEN);
+            furi_check(osMutexRelease(usb_uart->usb_mutex) == osOK);
+
+            if(size > 0) {
+                furi_hal_uart_tx(usb_uart->cfg.uart_ch, data, size);
+            }
         }
     }
     return 0;
@@ -184,26 +167,11 @@ static int32_t usb_uart_tx_thread(void* context) {
 /* VCP callbacks */
 
 static void vcp_on_cdc_tx_complete() {
-    osEventFlagsSet(usb_uart->events, WorkerEvtSof);
+    osSemaphoreRelease(usb_uart->tx_sem);
 }
 
 static void vcp_on_cdc_rx() {
-    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
-
-    uint16_t max_len = xStreamBufferSpacesAvailable(usb_uart->tx_stream);
-    if(max_len >= USB_PKT_LEN) {
-        //if(max_len > USB_PKT_LEN) max_len = USB_PKT_LEN;
-        int32_t size = furi_hal_cdc_receive(usb_uart->cfg.vcp_ch, usb_uart->tx_buf, USB_PKT_LEN);
-        if(size > 0) {
-            size_t ret = xStreamBufferSendFromISR(
-                usb_uart->tx_stream, usb_uart->tx_buf, size, &xHigherPriorityTaskWoken);
-            furi_check(ret == size);
-        }
-    } else {
-        usb_uart->buf_full = true;
-    }
-    osEventFlagsSet(usb_uart->events, WorkerEvtTxReady);
-    portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
+    osThreadFlagsSet(furi_thread_get_thread_id(usb_uart->tx_thread), WorkerEvtCdcRx);
 }
 
 static void vcp_state_callback(uint8_t state) {
@@ -228,18 +196,15 @@ void usb_uart_enable(UsbUartConfig* cfg) {
         furi_thread_set_context(usb_uart->thread, cfg);
         furi_thread_set_callback(usb_uart->thread, usb_uart_worker);
 
-        usb_uart->events = osEventFlagsNew(NULL);
-
         furi_thread_start(usb_uart->thread);
     }
 }
 
 void usb_uart_disable() {
     if(running == true) {
-        osEventFlagsSet(usb_uart->events, WorkerEvtStop);
+        osThreadFlagsSet(furi_thread_get_thread_id(usb_uart->thread), WorkerEvtStop);
         furi_thread_join(usb_uart->thread);
         furi_thread_free(usb_uart->thread);
-        osEventFlagsDelete(usb_uart->events);
         free(usb_uart);
         running = false;
     }
diff --git a/applications/gui/modules/variable-item-list.c b/applications/gui/modules/variable-item-list.c
index 800e0602..03f04cb6 100755..100644
--- a/applications/gui/modules/variable-item-list.c
+++ b/applications/gui/modules/variable-item-list.c
@@ -84,6 +84,40 @@ static void variable_item_list_draw_callback(Canvas* canvas, void* _model) {
     elements_scrollbar(canvas, model->position, VariableItemArray_size(model->items));
 }
 
+void variable_item_list_set_selected_item(VariableItemList* variable_item_list, uint8_t index) {
+    with_view_model(
+        variable_item_list->view, (VariableItemListModel * model) {
+            uint8_t position = index;
+            if(position >= VariableItemArray_size(model->items)) {
+                position = 0;
+            }
+
+            model->position = position;
+            model->window_position = position;
+
+            if(model->window_position > 0) {
+                model->window_position -= 1;
+            }
+
+            if(VariableItemArray_size(model->items) <= 4) {
+                model->window_position = 0;
+            } else {
+                if(model->window_position >= (VariableItemArray_size(model->items) - 4)) {
+                    model->window_position = (VariableItemArray_size(model->items) - 4);
+                }
+            }
+
+            return true;
+        });
+}
+
+uint8_t variable_item_list_get_selected_item_index(VariableItemList* variable_item_list) {
+    VariableItemListModel* model = view_get_model(variable_item_list->view);
+    uint8_t idx = model->position;
+    view_commit_model(variable_item_list->view, false);
+    return idx;
+}
+
 static bool variable_item_list_input_callback(InputEvent* event, void* context) {
     VariableItemList* variable_item_list = context;
     furi_assert(variable_item_list);
@@ -323,4 +357,4 @@ uint8_t variable_item_get_current_value_index(VariableItem* item) {
 
 void* variable_item_get_context(VariableItem* item) {
     return item->context;
-}
\ No newline at end of file
+}
diff --git a/applications/gui/modules/variable-item-list.h b/applications/gui/modules/variable-item-list.h
index e1e3cbf7..b67a02e6 100755
--- a/applications/gui/modules/variable-item-list.h
+++ b/applications/gui/modules/variable-item-list.h
@@ -70,6 +70,10 @@ void variable_item_list_set_enter_callback(
     VariableItemListEnterCallback callback,
     void* context);
 
+void variable_item_list_set_selected_item(VariableItemList* variable_item_list, uint8_t index);
+
+uint8_t variable_item_list_get_selected_item_index(VariableItemList* variable_item_list);
+
 /** Set item current selected index
  *
  * @param      item                 VariableItem* instance
diff --git a/firmware/targets/f6/furi-hal/furi-hal-console.h b/firmware/targets/f6/furi-hal/furi-hal-console.h
index 4c10d81e..637c17f6 100644
--- a/firmware/targets/f6/furi-hal/furi-hal-console.h
+++ b/firmware/targets/f6/furi-hal/furi-hal-console.h
@@ -7,12 +7,6 @@
 extern "C" {
 #endif
 
-typedef enum {
-    UartIrqEventRXNE,
-    UartIrqEventIDLE,
-    //TODO: more events
-} UartIrqEvent;
-
 void furi_hal_console_init();
 
 void furi_hal_console_enable();
diff --git a/firmware/targets/f6/furi-hal/furi-hal-uart.h b/firmware/targets/f6/furi-hal/furi-hal-uart.h
index 6be156b7..731a12a2 100644
--- a/firmware/targets/f6/furi-hal/furi-hal-uart.h
+++ b/firmware/targets/f6/furi-hal/furi-hal-uart.h
@@ -2,7 +2,6 @@
 
 #include <stddef.h>
 #include <stdint.h>
-#include "furi-hal-console.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -13,6 +12,11 @@ typedef enum {
     FuriHalUartIdLPUART1,
 } FuriHalUartId;
 
+typedef enum {
+    UartIrqEventRXNE,
+    UartIrqEventIDLE,
+    //TODO: more events
+} UartIrqEvent;
 
 void furi_hal_uart_init(FuriHalUartId ch, uint32_t baud);
 
diff --git a/firmware/targets/f6/furi-hal/furi-hal-usb-cdc.c b/firmware/targets/f6/furi-hal/furi-hal-usb-cdc.c
index 9386b100..dd82cf16 100644
--- a/firmware/targets/f6/furi-hal/furi-hal-usb-cdc.c
+++ b/firmware/targets/f6/furi-hal/furi-hal-usb-cdc.c
@@ -7,12 +7,12 @@
 #include "usb_cdc.h"
 
 #define CDC0_RXD_EP      0x01
-#define CDC0_TXD_EP      0x81
-#define CDC0_NTF_EP      0x82
+#define CDC0_TXD_EP      0x82
+#define CDC0_NTF_EP      0x83
 
-#define CDC1_RXD_EP      0x03
-#define CDC1_TXD_EP      0x83
-#define CDC1_NTF_EP      0x84
+#define CDC1_RXD_EP      0x04
+#define CDC1_TXD_EP      0x85
+#define CDC1_NTF_EP      0x86
 
 #define CDC_NTF_SZ      0x08
 
@@ -446,10 +446,12 @@ void furi_hal_cdc_send(uint8_t if_num, uint8_t* buf, uint16_t len) {
 }
 
 int32_t furi_hal_cdc_receive(uint8_t if_num, uint8_t* buf, uint16_t max_len) {
+    int32_t len = 0;
     if (if_num == 0)
-        return usbd_ep_read(usb_dev, CDC0_RXD_EP, buf, max_len);
+        len = usbd_ep_read(usb_dev, CDC0_RXD_EP, buf, max_len);
     else
-        return usbd_ep_read(usb_dev, CDC1_RXD_EP, buf, max_len);
+        len = usbd_ep_read(usb_dev, CDC1_RXD_EP, buf, max_len);
+    return ((len < 0) ? 0 : len);
 }
 
 static void cdc_on_wakeup(usbd_device *dev) {
diff --git a/firmware/targets/f6/furi-hal/furi-hal-vcp.c b/firmware/targets/f6/furi-hal/furi-hal-vcp.c
index b2f17842..b0b47f46 100644
--- a/firmware/targets/f6/furi-hal/furi-hal-vcp.c
+++ b/firmware/targets/f6/furi-hal/furi-hal-vcp.c
@@ -3,18 +3,28 @@
 #include <furi.h>
 #include <stream_buffer.h>
 
-#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 USB_CDC_PKT_LEN CDC_DATA_SZ
 #define VCP_IF_NUM 0
 
+typedef enum {
+    VcpConnect,
+    VcpDisconnect,
+} VcpEvent;
+
 typedef struct {
     volatile bool connected;
 
-    StreamBufferHandle_t rx_stream;
-    volatile bool rx_stream_full;
+    uint8_t rx_buf[USB_CDC_PKT_LEN];
+    uint8_t rx_buf_start;
+    uint8_t rx_buf_len;
+
+    osMessageQueueId_t event_queue;
+
+    osMutexId_t usb_mutex;
+
+    osSemaphoreId_t tx_sem;
+    osSemaphoreId_t rx_sem;
 
-    osSemaphoreId_t tx_semaphore;
 } FuriHalVcp;
 
 static void vcp_on_cdc_tx_complete();
@@ -30,22 +40,21 @@ static CdcCallbacks cdc_cb = {
     NULL,
 };
 
-static FuriHalVcp* furi_hal_vcp = NULL;
+static FuriHalVcp* vcp = NULL;
 
 static const uint8_t ascii_soh = 0x01;
 static const uint8_t ascii_eot = 0x04;
 
-static uint8_t* vcp_rx_buf;
-
 void furi_hal_vcp_init() {
-    furi_hal_vcp = furi_alloc(sizeof(FuriHalVcp));
-    vcp_rx_buf = furi_alloc(APP_RX_DATA_SIZE);
-    furi_hal_vcp->connected = false;
-    
-    furi_hal_vcp->rx_stream = xStreamBufferCreate(FURI_HAL_VCP_RX_BUFFER_SIZE, 1);
-    furi_hal_vcp->rx_stream_full = false;
+    vcp = furi_alloc(sizeof(FuriHalVcp));
+    vcp->connected = false;
+
+    vcp->usb_mutex = osMutexNew(NULL);
+
+    vcp->tx_sem = osSemaphoreNew(1, 1, NULL);
+    vcp->rx_sem = osSemaphoreNew(1, 0, NULL);
 
-    furi_hal_vcp->tx_semaphore = osSemaphoreNew(1, 1, NULL);
+    vcp->event_queue = osMessageQueueNew(8, sizeof(VcpEvent), NULL);
 
     furi_hal_cdc_set_callbacks(VCP_IF_NUM, &cdc_cb);
 
@@ -54,111 +63,149 @@ void furi_hal_vcp_init() {
 
 void furi_hal_vcp_enable() {
     furi_hal_cdc_set_callbacks(VCP_IF_NUM, &cdc_cb);
-    furi_hal_vcp->connected = true;
+    VcpEvent evt = VcpConnect;
+    osMessageQueuePut(vcp->event_queue, &evt, 0, 0);
+    vcp->connected = true;
+    osSemaphoreRelease(vcp->tx_sem);
+    osSemaphoreRelease(vcp->rx_sem);
 }
 
 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);
+    VcpEvent evt = VcpDisconnect;
+    osMessageQueuePut(vcp->event_queue, &evt, 0, 0);
+    vcp->connected = false;
+    osSemaphoreRelease(vcp->tx_sem);
+    osSemaphoreRelease(vcp->rx_sem);
 }
 
-size_t furi_hal_vcp_rx(uint8_t* buffer, size_t size) {
-    furi_assert(furi_hal_vcp);
+size_t furi_hal_vcp_rx_with_timeout(uint8_t* buffer, size_t size, uint32_t timeout) {
+    furi_assert(vcp);
+    furi_assert(buffer);
 
-    size_t received = xStreamBufferReceive(furi_hal_vcp->rx_stream, buffer, size, portMAX_DELAY);
+    size_t rx_cnt = 0;
 
-    if(furi_hal_vcp->rx_stream_full
-        && xStreamBufferSpacesAvailable(furi_hal_vcp->rx_stream) >= APP_RX_DATA_SIZE) {
-        furi_hal_vcp->rx_stream_full = false;
+    VcpEvent evt = VcpDisconnect;
+
+    if (vcp->rx_buf_len > 0) {
+        size_t len = (vcp->rx_buf_len > size) ? (size) : (vcp->rx_buf_len);
+        memcpy(&buffer[rx_cnt], &vcp->rx_buf[vcp->rx_buf_start], len);
+        vcp->rx_buf_len -= len;
+        vcp->rx_buf_start += len;
+        rx_cnt += len;
     }
 
-    return received;
+    while (rx_cnt < size) {
+        if (osMessageQueueGet(vcp->event_queue, &evt, NULL, 0) == osOK) {
+            if (evt == VcpConnect)
+                buffer[rx_cnt] = ascii_soh;
+            else {
+                buffer[rx_cnt] = ascii_eot;
+                vcp->rx_buf_len = 0;
+            }
+            rx_cnt++;
+            return rx_cnt;
+        }
+
+        if (osSemaphoreAcquire(vcp->rx_sem, timeout) == osErrorTimeout)
+            return rx_cnt;
+        
+        furi_check(osMutexAcquire(vcp->usb_mutex, osWaitForever) == osOK);
+        size_t len = furi_hal_cdc_receive(VCP_IF_NUM, vcp->rx_buf, USB_CDC_PKT_LEN);
+        furi_check(osMutexRelease(vcp->usb_mutex) == osOK);
+
+        vcp->rx_buf_len = len;
+        vcp->rx_buf_start = 0;
+
+        if (vcp->rx_buf_len > (size - rx_cnt)) {
+            len = size - rx_cnt;
+            memcpy(&buffer[rx_cnt], vcp->rx_buf, len);
+            vcp->rx_buf_len -= len;
+            vcp->rx_buf_start += len;
+        } else {
+            memcpy(&buffer[rx_cnt], vcp->rx_buf, vcp->rx_buf_len);
+            vcp->rx_buf_len = 0;
+        }
+        rx_cnt += len;
+    }
+    return rx_cnt;
 }
 
-size_t furi_hal_vcp_rx_with_timeout(uint8_t* buffer, size_t size, uint32_t timeout) {
-    furi_assert(furi_hal_vcp);
-    return xStreamBufferReceive(furi_hal_vcp->rx_stream, buffer, size, timeout);
+size_t furi_hal_vcp_rx(uint8_t* buffer, size_t size) {
+    furi_assert(vcp);
+
+    return furi_hal_vcp_rx_with_timeout(buffer, size, portMAX_DELAY);
 }
 
 void furi_hal_vcp_tx(const uint8_t* buffer, size_t size) {
-    furi_assert(furi_hal_vcp);
+    furi_assert(vcp);
 
-    while (size > 0 && furi_hal_vcp->connected) {
-        furi_check(osSemaphoreAcquire(furi_hal_vcp->tx_semaphore, osWaitForever) == osOK);
-        if (!furi_hal_vcp->connected)
+    while (size > 0 && vcp->connected) {
+        furi_check(osSemaphoreAcquire(vcp->tx_sem, osWaitForever) == osOK);
+        if (!vcp->connected)
             break;
 
         size_t batch_size = size;
-        if (batch_size > APP_TX_DATA_SIZE) {
-            batch_size = APP_TX_DATA_SIZE;
+        if (batch_size > USB_CDC_PKT_LEN) {
+            batch_size = USB_CDC_PKT_LEN;
         }
 
+        furi_check(osMutexAcquire(vcp->usb_mutex, osWaitForever) == osOK);
         furi_hal_cdc_send(VCP_IF_NUM, (uint8_t*)buffer, batch_size);
+        furi_check(osMutexRelease(vcp->usb_mutex) == osOK);
+
         size -= batch_size;
         buffer += batch_size;
     }
 }
 
 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);
+    if (state == 1) {
+        osSemaphoreRelease(vcp->rx_sem);
+        //osSemaphoreRelease(vcp->tx_sem);
+    }
+    else if (vcp->connected) {
+        vcp->connected = false;
+        osSemaphoreRelease(vcp->rx_sem);
+        VcpEvent evt = VcpDisconnect;
+        osMessageQueuePut(vcp->event_queue, &evt, 0, 0);
+        //osSemaphoreRelease(vcp->tx_sem);
     }
 }
 
 static void vcp_on_cdc_control_line(uint8_t state) {
-
-    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
     // bit 0: DTR state, bit 1: RTS state
-    // bool dtr = state & 0b01;
     bool dtr = state & 0b1;
 
     if (dtr) {
-        if (!furi_hal_vcp->connected) {
-            furi_hal_vcp->connected = true;
-            xStreamBufferSendFromISR(furi_hal_vcp->rx_stream, &ascii_soh, 1, &xHigherPriorityTaskWoken); // SOH 
-
+        if (!vcp->connected) {
+            vcp->connected = true;
+            VcpEvent evt = VcpConnect;
+            osMessageQueuePut(vcp->event_queue, &evt, 0, 0);
         }
     } else {
-        if (furi_hal_vcp->connected) {
-            xStreamBufferSendFromISR(furi_hal_vcp->rx_stream, &ascii_eot, 1, &xHigherPriorityTaskWoken); // EOT
-            furi_hal_vcp->connected = false;
+        if (vcp->connected) {
+            VcpEvent evt = VcpDisconnect;
+            osMessageQueuePut(vcp->event_queue, &evt, 0, 0);
+            vcp->connected = false;
         }
     }
 
-    osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
-
-    portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
+    osSemaphoreRelease(vcp->tx_sem);
+    osSemaphoreRelease(vcp->rx_sem);
 }
 
-static void vcp_on_cdc_rx() { 
-    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
-
-    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);
+static void vcp_on_cdc_rx() {
+    if (vcp->connected == false)
+        return;
+    osSemaphoreRelease(vcp->rx_sem);
 }
 
 static void vcp_on_cdc_tx_complete() {
-    osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
+    osSemaphoreRelease(vcp->tx_sem);
 }
 
 bool furi_hal_vcp_is_connected(void) {
-    return furi_hal_vcp->connected;
+    return vcp->connected;
 }
 
diff --git a/firmware/targets/f7/furi-hal/furi-hal-console.h b/firmware/targets/f7/furi-hal/furi-hal-console.h
index 4c10d81e..637c17f6 100644
--- a/firmware/targets/f7/furi-hal/furi-hal-console.h
+++ b/firmware/targets/f7/furi-hal/furi-hal-console.h
@@ -7,12 +7,6 @@
 extern "C" {
 #endif
 
-typedef enum {
-    UartIrqEventRXNE,
-    UartIrqEventIDLE,
-    //TODO: more events
-} UartIrqEvent;
-
 void furi_hal_console_init();
 
 void furi_hal_console_enable();
diff --git a/firmware/targets/f7/furi-hal/furi-hal-uart.c b/firmware/targets/f7/furi-hal/furi-hal-uart.c
index c6e74101..ff2d94a7 100644
--- a/firmware/targets/f7/furi-hal/furi-hal-uart.c
+++ b/firmware/targets/f7/furi-hal/furi-hal-uart.c
@@ -182,6 +182,8 @@ void LPUART1_IRQHandler(void) {
     } else if (LL_LPUART_IsActiveFlag_IDLE(LPUART1)) {
         irq_cb[FuriHalUartIdLPUART1](UartIrqEventIDLE, 0);
         LL_LPUART_ClearFlag_IDLE(LPUART1);
+    } else if (LL_LPUART_IsActiveFlag_ORE(LPUART1)) {
+        LL_LPUART_ClearFlag_ORE(LPUART1);
     }
     //TODO: more events
 }
@@ -193,5 +195,7 @@ void USART1_IRQHandler(void) {
     } else if (LL_USART_IsActiveFlag_IDLE(USART1)) {
         irq_cb[FuriHalUartIdUSART1](UartIrqEventIDLE, 0);
         LL_USART_ClearFlag_IDLE(USART1);
+    } else if (LL_USART_IsActiveFlag_ORE(USART1)) {
+        LL_USART_ClearFlag_ORE(USART1);
     }
 }
diff --git a/firmware/targets/f7/furi-hal/furi-hal-uart.h b/firmware/targets/f7/furi-hal/furi-hal-uart.h
index 6be156b7..731a12a2 100644
--- a/firmware/targets/f7/furi-hal/furi-hal-uart.h
+++ b/firmware/targets/f7/furi-hal/furi-hal-uart.h
@@ -2,7 +2,6 @@
 
 #include <stddef.h>
 #include <stdint.h>
-#include "furi-hal-console.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -13,6 +12,11 @@ typedef enum {
     FuriHalUartIdLPUART1,
 } FuriHalUartId;
 
+typedef enum {
+    UartIrqEventRXNE,
+    UartIrqEventIDLE,
+    //TODO: more events
+} UartIrqEvent;
 
 void furi_hal_uart_init(FuriHalUartId ch, uint32_t baud);
 
diff --git a/firmware/targets/f7/furi-hal/furi-hal-usb-cdc.c b/firmware/targets/f7/furi-hal/furi-hal-usb-cdc.c
index 9386b100..dd82cf16 100644
--- a/firmware/targets/f7/furi-hal/furi-hal-usb-cdc.c
+++ b/firmware/targets/f7/furi-hal/furi-hal-usb-cdc.c
@@ -7,12 +7,12 @@
 #include "usb_cdc.h"
 
 #define CDC0_RXD_EP      0x01
-#define CDC0_TXD_EP      0x81
-#define CDC0_NTF_EP      0x82
+#define CDC0_TXD_EP      0x82
+#define CDC0_NTF_EP      0x83
 
-#define CDC1_RXD_EP      0x03
-#define CDC1_TXD_EP      0x83
-#define CDC1_NTF_EP      0x84
+#define CDC1_RXD_EP      0x04
+#define CDC1_TXD_EP      0x85
+#define CDC1_NTF_EP      0x86
 
 #define CDC_NTF_SZ      0x08
 
@@ -446,10 +446,12 @@ void furi_hal_cdc_send(uint8_t if_num, uint8_t* buf, uint16_t len) {
 }
 
 int32_t furi_hal_cdc_receive(uint8_t if_num, uint8_t* buf, uint16_t max_len) {
+    int32_t len = 0;
     if (if_num == 0)
-        return usbd_ep_read(usb_dev, CDC0_RXD_EP, buf, max_len);
+        len = usbd_ep_read(usb_dev, CDC0_RXD_EP, buf, max_len);
     else
-        return usbd_ep_read(usb_dev, CDC1_RXD_EP, buf, max_len);
+        len = usbd_ep_read(usb_dev, CDC1_RXD_EP, buf, max_len);
+    return ((len < 0) ? 0 : len);
 }
 
 static void cdc_on_wakeup(usbd_device *dev) {
diff --git a/firmware/targets/f7/furi-hal/furi-hal-vcp.c b/firmware/targets/f7/furi-hal/furi-hal-vcp.c
index b2f17842..b0b47f46 100644
--- a/firmware/targets/f7/furi-hal/furi-hal-vcp.c
+++ b/firmware/targets/f7/furi-hal/furi-hal-vcp.c
@@ -3,18 +3,28 @@
 #include <furi.h>
 #include <stream_buffer.h>
 
-#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 USB_CDC_PKT_LEN CDC_DATA_SZ
 #define VCP_IF_NUM 0
 
+typedef enum {
+    VcpConnect,
+    VcpDisconnect,
+} VcpEvent;
+
 typedef struct {
     volatile bool connected;
 
-    StreamBufferHandle_t rx_stream;
-    volatile bool rx_stream_full;
+    uint8_t rx_buf[USB_CDC_PKT_LEN];
+    uint8_t rx_buf_start;
+    uint8_t rx_buf_len;
+
+    osMessageQueueId_t event_queue;
+
+    osMutexId_t usb_mutex;
+
+    osSemaphoreId_t tx_sem;
+    osSemaphoreId_t rx_sem;
 
-    osSemaphoreId_t tx_semaphore;
 } FuriHalVcp;
 
 static void vcp_on_cdc_tx_complete();
@@ -30,22 +40,21 @@ static CdcCallbacks cdc_cb = {
     NULL,
 };
 
-static FuriHalVcp* furi_hal_vcp = NULL;
+static FuriHalVcp* vcp = NULL;
 
 static const uint8_t ascii_soh = 0x01;
 static const uint8_t ascii_eot = 0x04;
 
-static uint8_t* vcp_rx_buf;
-
 void furi_hal_vcp_init() {
-    furi_hal_vcp = furi_alloc(sizeof(FuriHalVcp));
-    vcp_rx_buf = furi_alloc(APP_RX_DATA_SIZE);
-    furi_hal_vcp->connected = false;
-    
-    furi_hal_vcp->rx_stream = xStreamBufferCreate(FURI_HAL_VCP_RX_BUFFER_SIZE, 1);
-    furi_hal_vcp->rx_stream_full = false;
+    vcp = furi_alloc(sizeof(FuriHalVcp));
+    vcp->connected = false;
+
+    vcp->usb_mutex = osMutexNew(NULL);
+
+    vcp->tx_sem = osSemaphoreNew(1, 1, NULL);
+    vcp->rx_sem = osSemaphoreNew(1, 0, NULL);
 
-    furi_hal_vcp->tx_semaphore = osSemaphoreNew(1, 1, NULL);
+    vcp->event_queue = osMessageQueueNew(8, sizeof(VcpEvent), NULL);
 
     furi_hal_cdc_set_callbacks(VCP_IF_NUM, &cdc_cb);
 
@@ -54,111 +63,149 @@ void furi_hal_vcp_init() {
 
 void furi_hal_vcp_enable() {
     furi_hal_cdc_set_callbacks(VCP_IF_NUM, &cdc_cb);
-    furi_hal_vcp->connected = true;
+    VcpEvent evt = VcpConnect;
+    osMessageQueuePut(vcp->event_queue, &evt, 0, 0);
+    vcp->connected = true;
+    osSemaphoreRelease(vcp->tx_sem);
+    osSemaphoreRelease(vcp->rx_sem);
 }
 
 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);
+    VcpEvent evt = VcpDisconnect;
+    osMessageQueuePut(vcp->event_queue, &evt, 0, 0);
+    vcp->connected = false;
+    osSemaphoreRelease(vcp->tx_sem);
+    osSemaphoreRelease(vcp->rx_sem);
 }
 
-size_t furi_hal_vcp_rx(uint8_t* buffer, size_t size) {
-    furi_assert(furi_hal_vcp);
+size_t furi_hal_vcp_rx_with_timeout(uint8_t* buffer, size_t size, uint32_t timeout) {
+    furi_assert(vcp);
+    furi_assert(buffer);
 
-    size_t received = xStreamBufferReceive(furi_hal_vcp->rx_stream, buffer, size, portMAX_DELAY);
+    size_t rx_cnt = 0;
 
-    if(furi_hal_vcp->rx_stream_full
-        && xStreamBufferSpacesAvailable(furi_hal_vcp->rx_stream) >= APP_RX_DATA_SIZE) {
-        furi_hal_vcp->rx_stream_full = false;
+    VcpEvent evt = VcpDisconnect;
+
+    if (vcp->rx_buf_len > 0) {
+        size_t len = (vcp->rx_buf_len > size) ? (size) : (vcp->rx_buf_len);
+        memcpy(&buffer[rx_cnt], &vcp->rx_buf[vcp->rx_buf_start], len);
+        vcp->rx_buf_len -= len;
+        vcp->rx_buf_start += len;
+        rx_cnt += len;
     }
 
-    return received;
+    while (rx_cnt < size) {
+        if (osMessageQueueGet(vcp->event_queue, &evt, NULL, 0) == osOK) {
+            if (evt == VcpConnect)
+                buffer[rx_cnt] = ascii_soh;
+            else {
+                buffer[rx_cnt] = ascii_eot;
+                vcp->rx_buf_len = 0;
+            }
+            rx_cnt++;
+            return rx_cnt;
+        }
+
+        if (osSemaphoreAcquire(vcp->rx_sem, timeout) == osErrorTimeout)
+            return rx_cnt;
+        
+        furi_check(osMutexAcquire(vcp->usb_mutex, osWaitForever) == osOK);
+        size_t len = furi_hal_cdc_receive(VCP_IF_NUM, vcp->rx_buf, USB_CDC_PKT_LEN);
+        furi_check(osMutexRelease(vcp->usb_mutex) == osOK);
+
+        vcp->rx_buf_len = len;
+        vcp->rx_buf_start = 0;
+
+        if (vcp->rx_buf_len > (size - rx_cnt)) {
+            len = size - rx_cnt;
+            memcpy(&buffer[rx_cnt], vcp->rx_buf, len);
+            vcp->rx_buf_len -= len;
+            vcp->rx_buf_start += len;
+        } else {
+            memcpy(&buffer[rx_cnt], vcp->rx_buf, vcp->rx_buf_len);
+            vcp->rx_buf_len = 0;
+        }
+        rx_cnt += len;
+    }
+    return rx_cnt;
 }
 
-size_t furi_hal_vcp_rx_with_timeout(uint8_t* buffer, size_t size, uint32_t timeout) {
-    furi_assert(furi_hal_vcp);
-    return xStreamBufferReceive(furi_hal_vcp->rx_stream, buffer, size, timeout);
+size_t furi_hal_vcp_rx(uint8_t* buffer, size_t size) {
+    furi_assert(vcp);
+
+    return furi_hal_vcp_rx_with_timeout(buffer, size, portMAX_DELAY);
 }
 
 void furi_hal_vcp_tx(const uint8_t* buffer, size_t size) {
-    furi_assert(furi_hal_vcp);
+    furi_assert(vcp);
 
-    while (size > 0 && furi_hal_vcp->connected) {
-        furi_check(osSemaphoreAcquire(furi_hal_vcp->tx_semaphore, osWaitForever) == osOK);
-        if (!furi_hal_vcp->connected)
+    while (size > 0 && vcp->connected) {
+        furi_check(osSemaphoreAcquire(vcp->tx_sem, osWaitForever) == osOK);
+        if (!vcp->connected)
             break;
 
         size_t batch_size = size;
-        if (batch_size > APP_TX_DATA_SIZE) {
-            batch_size = APP_TX_DATA_SIZE;
+        if (batch_size > USB_CDC_PKT_LEN) {
+            batch_size = USB_CDC_PKT_LEN;
         }
 
+        furi_check(osMutexAcquire(vcp->usb_mutex, osWaitForever) == osOK);
         furi_hal_cdc_send(VCP_IF_NUM, (uint8_t*)buffer, batch_size);
+        furi_check(osMutexRelease(vcp->usb_mutex) == osOK);
+
         size -= batch_size;
         buffer += batch_size;
     }
 }
 
 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);
+    if (state == 1) {
+        osSemaphoreRelease(vcp->rx_sem);
+        //osSemaphoreRelease(vcp->tx_sem);
+    }
+    else if (vcp->connected) {
+        vcp->connected = false;
+        osSemaphoreRelease(vcp->rx_sem);
+        VcpEvent evt = VcpDisconnect;
+        osMessageQueuePut(vcp->event_queue, &evt, 0, 0);
+        //osSemaphoreRelease(vcp->tx_sem);
     }
 }
 
 static void vcp_on_cdc_control_line(uint8_t state) {
-
-    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
     // bit 0: DTR state, bit 1: RTS state
-    // bool dtr = state & 0b01;
     bool dtr = state & 0b1;
 
     if (dtr) {
-        if (!furi_hal_vcp->connected) {
-            furi_hal_vcp->connected = true;
-            xStreamBufferSendFromISR(furi_hal_vcp->rx_stream, &ascii_soh, 1, &xHigherPriorityTaskWoken); // SOH 
-
+        if (!vcp->connected) {
+            vcp->connected = true;
+            VcpEvent evt = VcpConnect;
+            osMessageQueuePut(vcp->event_queue, &evt, 0, 0);
         }
     } else {
-        if (furi_hal_vcp->connected) {
-            xStreamBufferSendFromISR(furi_hal_vcp->rx_stream, &ascii_eot, 1, &xHigherPriorityTaskWoken); // EOT
-            furi_hal_vcp->connected = false;
+        if (vcp->connected) {
+            VcpEvent evt = VcpDisconnect;
+            osMessageQueuePut(vcp->event_queue, &evt, 0, 0);
+            vcp->connected = false;
         }
     }
 
-    osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
-
-    portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
+    osSemaphoreRelease(vcp->tx_sem);
+    osSemaphoreRelease(vcp->rx_sem);
 }
 
-static void vcp_on_cdc_rx() { 
-    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
-
-    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);
+static void vcp_on_cdc_rx() {
+    if (vcp->connected == false)
+        return;
+    osSemaphoreRelease(vcp->rx_sem);
 }
 
 static void vcp_on_cdc_tx_complete() {
-    osSemaphoreRelease(furi_hal_vcp->tx_semaphore);
+    osSemaphoreRelease(vcp->tx_sem);
 }
 
 bool furi_hal_vcp_is_connected(void) {
-    return furi_hal_vcp->connected;
+    return vcp->connected;
 }
 
diff --git a/scripts/flipper/storage.py b/scripts/flipper/storage.py
index 73799cef..53c01d8c 100644
--- a/scripts/flipper/storage.py
+++ b/scripts/flipper/storage.py
@@ -1,4 +1,5 @@
 import os
+import sys
 import serial
 import time
 import hashlib
@@ -143,7 +144,7 @@ class FlipperStorage:
         walk_dirs = []
 
         path = path.replace("//", "/")
-        self.send_and_wait_eol('storage list "' + path + '"\r')
+        self.send_and_wait_eol(f'storage list "{path}"\r')
         data = self.read.until(self.CLI_PROMPT)
         lines = data.split(b"\r\n")
 
@@ -198,9 +199,7 @@ class FlipperStorage:
             if size == 0:
                 break
 
-            self.send_and_wait_eol(
-                'storage write_chunk "' + filename_to + '" ' + str(size) + "\r"
-            )
+            self.send_and_wait_eol(f'storage write_chunk "{filename_to}" {size}\r')
             answer = self.read.until(self.CLI_EOL)
             if self.has_error(answer):
                 self.last_error = self.get_error(answer)
@@ -214,9 +213,8 @@ class FlipperStorage:
             percent = str(math.ceil(file.tell() / filesize * 100))
             total_chunks = str(math.ceil(filesize / buffer_size))
             current_chunk = str(math.ceil(file.tell() / buffer_size))
-            print(
-                percent + "%, chunk " + current_chunk + " of " + total_chunks, end="\r"
-            )
+            sys.stdout.write(f"\r{percent}%, chunk {current_chunk} of {total_chunks}")
+            sys.stdout.flush()
         file.close()
         print()
         return True
@@ -246,9 +244,8 @@ class FlipperStorage:
             percent = str(math.ceil(readed_size / size * 100))
             total_chunks = str(math.ceil(size / buffer_size))
             current_chunk = str(math.ceil(readed_size / buffer_size))
-            print(
-                percent + "%, chunk " + current_chunk + " of " + total_chunks, end="\r"
-            )
+            sys.stdout.write(f"\r{percent}%, chunk {current_chunk} of {total_chunks}")
+            sys.stdout.flush()
         print()
         self.read.until(self.CLI_PROMPT)
         return filedata