fix(uart): ensure debug uart is ready before send

Like state is ready not need to loop on the blocking
HAL_UART_Transmit(). If not ok it can be HAL_ERROR or HAL_TIMEOUT.

Fixes stm32duino#1789

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

libraries/SrcWrapper/src/stm32/uart.c

@@ -720,14 +720,17 @@ size_t uart_debug_write(uint8_t *data, uint32_t size)
       }
     }
   }
+  UART_HandleTypeDef *huart = uart_handlers[serial_debug.index];
+  while (huart->gState != HAL_UART_STATE_READY) {
+    if ((HAL_GetTick() - tickstart) >= TX_TIMEOUT) {
+      return 0;
+    }
+  };
 
   HAL_NVIC_DisableIRQ(serial_debug.irq);
 
-  while (HAL_UART_Transmit(uart_handlers[serial_debug.index], data, size, TX_TIMEOUT) != HAL_OK) {
-    if ((HAL_GetTick() - tickstart) >=  TX_TIMEOUT) {
-      size = 0;
-      break;
-    }
+  if (HAL_UART_Transmit(huart, data, size, TX_TIMEOUT) != HAL_OK) {
+    size = 0;
   }
 
   HAL_NVIC_EnableIRQ(serial_debug.irq);