STM32L072 Discovery Board cannot receive the UART data

[VijayRakeshM]

Hi,

I'm using STM32L072 Discovery Board and generated UART code using CubeMx, I'm able to transmit the data via UART but not able to receive the data. Please help me in this regard.

int main(void)
{
  /* USER CODE BEGIN 1 */
 
  /* USER CODE END 1 */
 
  /* MCU Configuration--------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART2_UART_Init();
  /* USER CODE BEGIN 2 */
 
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
		HAL_UART_Receive(&huart2,buffer,4,5000);
		HAL_UART_Transmit(&huart2,buffer,4,100);
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}
 
static void MX_USART2_UART_Init(void)
{
 
  /* USER CODE BEGIN USART2_Init 0 */
 
  /* USER CODE END USART2_Init 0 */
 
  /* USER CODE BEGIN USART2_Init 1 */
 
  /* USER CODE END USART2_Init 1 */
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART2_Init 2 */
 
  /* USER CODE END USART2_Init 2 */
 
}

Thanks & Regards,

Vijay Rakesh.

[S.Ma]

Uart received should be done using interrupt and callback as you don t know when incoming data supposely happens.

[VijayRakeshM]

Hi @S.Ma​ ,

Thanks for the reply, I was just trying polling method to test UART looping code. Is it mandatory to enable interrupt for polling method?

Thanks & Regards,

Vijay Rakesh.

[S.Ma]

Never use polling for USART RX or anything that the microcontroller can't control time such as I2C or SPI Slave modes. unless wasting time.

[VijayRakeshM]

Thanks for your suggestion and I will implement interrupt but before moving on to the interrupt i would like to work on polling method so, Could please tell me why i'm not able to receive data via uart but i can transmit data.

[S.Ma · Accepted solution]

You should open cube library, look at projects for nucleo board, uart examples and test them.