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pratheep
pratheep
Associate II
February 21, 2018
Question

STM32F429-NUCLEO-144 UART3 IS NOT RECEIVING

  • February 21, 2018
  • 22 replies
  • 3752 views
Posted on February 21, 2018 at 04:06

Hi,

I amUsing STM32F429-NUCLEO- I write the code for UART3 transmit/receive (poling method) and the board is transmitting but the data is not receiving. Pls help me to fix the issue.

Find the attached source code

Thanks,

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    22 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    February 21, 2018
    Posted on February 21, 2018 at 05:00

    ...

    /* Infinite loop */

    /* USER CODE BEGIN WHILE */

    HAL_UART_Transmit(&huart3, pbufftx, strlen(pbufftx), 0xFFFF);

    while (1)

    {

    // Perhaps use the debugger as see what != HAL_OK values are returned

    if(HAL_UART_Receive(&huart3, pbuffrx, 1, 0xFFFF)==HAL_OK)

    {

    HAL_UART_Transmit(&huart3, pbuffrx, 1, 0xFFFF);

    }

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */

    }

    /* USER CODE END 3 */

    ...

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    Tesla DeLorean
    Tesla DeLorean
    Guru
    February 21, 2018
    Posted on February 21, 2018 at 05:15

    Alternative

    while (1)

    {

      if (USART3->SR & 0x20) // RXNE

        USART3->DR = USART3->DR; // Echo

      if (USART3->SR & 0x0F) // Errors

        USART3->DR; // Clear

    }
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    pratheep
    pratheepAuthor
    Associate II
    February 21, 2018
    Posted on February 21, 2018 at 06:10

    this also not working.

    Bogdan Golab
    Bogdan Golab
    Lead
    February 21, 2018
    Posted on February 21, 2018 at 08:19

    It's nucleo board so you should be able to use the VCOM - does it work fine? It eliminated external UART-to-USB converter as ST-LINK provides this feature.

    Bogdan Golab
    Bogdan Golab
    Lead
    February 21, 2018
    Posted on February 21, 2018 at 08:22

    Syarted CubeMX and pre-initilaized the board. It seems that USART3 is used as VCOM (frankly I do not have this particular board to verify).

    On nucleo-64 the USART2 is used and it is wired to the ST-LINK to appear as the emulated port.

    Try the VCOM assuming that the UART3 is used. Preinitialize board by the CubeMX when selecting the nucleo-144. The CubeMX 4.24 seems to initiate it.

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