int main(void)
{

  /* USER CODE BEGIN 1 */
   char str[9]={0};
  /* USER CODE END 1 */

  /* MCU Configuration----------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* Configure the system clock */
  SystemClock_Config();

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART2_UART_Init();

  /* USER CODE BEGIN 2 */
   LCD_ini();
   LCD_Clear();
   sprintf(str,"Stm32F407VG");
   LCD_String(str);
   LCD_SetPos(10, 2);
   sprintf(str,"ARM mc");
   LCD_String(str);
   HAL_UART_Receive_IT(&huart2, (uint8_t*) str, 8);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
   if(huart2.RxXferCount==0)
   {
      HAL_Delay(100);
      LCD_SetPos(0, 3);
      str[8]=0;
      LCD_String(str);
      HAL_UART_Receive_IT(&huart2, (uint8_t*) str, 8);
   }
  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */

}

while (1)
  {
   if(huart2.RxXferCount==0)
   {
      HAL_Delay(100);
      LCD_SetPos(0, 3);
      str[8]=0;
      LCD_String(str);
      HAL_UART_Receive_IT(&huart2, (uint8_t*) str, 8);
   }

if (huart2.RxXferCount != 0)

if (huart2.RxXferCount == 0)

sprintf(str,"ARM mc");

char str[9]={0};

LCD_String(str);

         HAL_UART_Receive_IT(&huart4, (uint8_t*)&str, 8);