Move debugger connection check to main

Core/Src/main.c

@@ -77,7 +77,9 @@ static void MX_SDIO_SD_Init(void);
 static void MX_USART1_UART_Init(void);
 
 /* USER CODE BEGIN PFP */
-int _write(int file, char *ptr, int len) for (int i = 0; i < len; i++) ITM_SendChar((*ptr++));
+int _write(int file, char *ptr, int len)
+{
+  for (int i = 0; i < len; i++) ITM_SendChar((*ptr++));
   return len;
 }
 /* USER CODE END PFP */