Add send break support

targets/f7/api_symbols.csv

@@ -1,5 +1,5 @@
 entry,status,name,type,params
-Version,+,78.1,,
+Version,+,78.2,,
 Header,+,applications/drivers/subghz/cc1101_ext/cc1101_ext_interconnect.h,,
 Header,+,applications/services/bt/bt_service/bt.h,,
 Header,+,applications/services/bt/bt_service/bt_keys_storage.h,,
@@ -1635,6 +1635,7 @@ Function,+,furi_hal_serial_get_gpio_pin,const GpioPin*,"FuriHalSerialHandle*, Fu
 Function,+,furi_hal_serial_init,void,"FuriHalSerialHandle*, uint32_t"
 Function,+,furi_hal_serial_is_baud_rate_supported,_Bool,"FuriHalSerialHandle*, uint32_t"
 Function,+,furi_hal_serial_resume,void,FuriHalSerialHandle*
+Function,+,furi_hal_serial_send_break,void,FuriHalSerialHandle*
 Function,+,furi_hal_serial_set_br,void,"FuriHalSerialHandle*, uint32_t"
 Function,+,furi_hal_serial_suspend,void,FuriHalSerialHandle*
 Function,+,furi_hal_serial_tx,void,"FuriHalSerialHandle*, const uint8_t*, size_t"

targets/f7/furi_hal/furi_hal_serial.c

@@ -950,3 +950,13 @@ const GpioPin*
 
     return furi_hal_serial_config[handle->id].gpio[direction];
 }
+
+void furi_hal_serial_send_break(FuriHalSerialHandle* handle) {
+    furi_check(handle);
+
+    if(handle->id == FuriHalSerialIdUsart) {
+        LL_USART_RequestBreakSending(USART1);
+    } else {
+        LL_LPUART_RequestBreakSending(LPUART1);
+    }
+}

targets/f7/furi_hal/furi_hal_serial.h

@@ -239,6 +239,12 @@ void furi_hal_serial_dma_rx_stop(FuriHalSerialHandle* handle);
  */
 size_t furi_hal_serial_dma_rx(FuriHalSerialHandle* handle, uint8_t* data, size_t len);
 
+/** Send a break sequence (low level for the whole character duration)
+ *
+ * @param      handle  Serial handle
+ */
+void furi_hal_serial_send_break(FuriHalSerialHandle* handle);
+
 #ifdef __cplusplus
 }
 #endif

targets/f7/furi_hal/furi_hal_usb_cdc.c

@@ -122,7 +122,7 @@ static const struct CdcConfigDescriptorSingle cdc_cfg_desc_single = {
                     .bFunctionLength = sizeof(struct usb_cdc_acm_desc),
                     .bDescriptorType = USB_DTYPE_CS_INTERFACE,
                     .bDescriptorSubType = USB_DTYPE_CDC_ACM,
-                    .bmCapabilities = 0,
+                    .bmCapabilities = USB_CDC_CAP_BRK,
                 },
             .cdc_union =
                 {
@@ -235,7 +235,7 @@ static const struct CdcConfigDescriptorDual
                             .bFunctionLength = sizeof(struct usb_cdc_acm_desc),
                             .bDescriptorType = USB_DTYPE_CS_INTERFACE,
                             .bDescriptorSubType = USB_DTYPE_CDC_ACM,
-                            .bmCapabilities = 0,
+                            .bmCapabilities = USB_CDC_CAP_BRK,
                         },
                     .cdc_union =
                         {
@@ -330,7 +330,7 @@ static const struct CdcConfigDescriptorDual
                             .bFunctionLength = sizeof(struct usb_cdc_acm_desc),
                             .bDescriptorType = USB_DTYPE_CS_INTERFACE,
                             .bDescriptorSubType = USB_DTYPE_CDC_ACM,
-                            .bmCapabilities = 0,
+                            .bmCapabilities = USB_CDC_CAP_BRK,
                         },
                     .cdc_union =
                         {
@@ -680,6 +680,13 @@ static usbd_respond cdc_control(usbd_device* dev, usbd_ctlreq* req, usbd_rqc_cal
             dev->status.data_ptr = &cdc_config[if_num];
             dev->status.data_count = sizeof(cdc_config[0]);
             return usbd_ack;
+        case USB_CDC_SEND_BREAK:
+            if(callbacks[if_num] != NULL) {
+                if(callbacks[if_num]->break_callback != NULL) {
+                    callbacks[if_num]->break_callback(cb_ctx[if_num], req->wValue);
+                }
+            }
+            return usbd_ack;
         default:
             return usbd_fail;
         }

targets/f7/furi_hal/furi_hal_usb_cdc.h

@@ -15,6 +15,7 @@ typedef struct {
     void (*state_callback)(void* context, uint8_t state);
     void (*ctrl_line_callback)(void* context, uint8_t state);
     void (*config_callback)(void* context, struct usb_cdc_line_coding* config);
+    void (*break_callback)(void* context, uint16_t duration);
 } CdcCallbacks;
 
 void furi_hal_cdc_set_callbacks(uint8_t if_num, CdcCallbacks* cb, void* context);