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Nordic Case Info
  • Case ID: 289356
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Use serial port to read data but never get timeout

user110158

Hi,

   I use serial port example to do out UART exchange data function. But I get a problem, I don't know why? Below is my source code.

static void serial_event_handler(struct nrf_serial_s const *p_serial, nrf_serial_event_t event)
{
    static uint8_t buffer[MAX_RX_BUFFER_SIZE] = {0};
    static uint8_t length = 0;

    switch (event)
    {
        case NRF_SERIAL_EVENT_TX_DONE:
            break;
        case NRF_SERIAL_EVENT_RX_DATA:
        {
             nrf_serial_read(&serial_uart, &buffer, 2, NULL, 100);

When I send 2 bytes data to our device from PC terminal. I can get a return and real data as i sent. But if I only send one data in from PC. I think I will get timeout return after 100ms. But I never get. Why?

Thank you.

John. 

Parents
  • 0

    Hi John,

    Which SDK are you using?

    Could you please specify the exact example that you are using?

    Best regards,
    Dejan

  • 0 in reply to user111786

    Hi.

       I use SDK 14 and I use examples\peripheral\serial  

    I try to fix it. If I move nrf_serial_read(&serial_uart, &buffer, 2, NULL, 100); to main loop. It work very well.

    Below is my source code

    I want to get 80 bytes data. if I only send 30 Bytes data from PC to our device. I will get timeout error code. This is what I want.

    static void serial_event_handler(struct nrf_serial_s const *p_serial, nrf_serial_event_t event)
{
    switch (event)
    {
        case NRF_SERIAL_EVENT_TX_DONE:
            break;
        case NRF_SERIAL_EVENT_RX_DATA:
        {
            radar_raw_data_get = 1;
        }
        break;
        case NRF_SERIAL_EVENT_DRV_ERR:
        break;
        case NRF_SERIAL_EVENT_FIFO_ERR:
        break;
        default:
        break;
    }
}

void main()
{
 for (;;)
    {
        receive_radar_raw_data();
        nrf_pwr_mgmt_run();
    }
    
 }
 
 void receive_radar_raw_data()
{
    uint32_t err_code = 0;
    if(radar_raw_data_get == 1)
    {
        if(radar_packet_select_number == 0)
        {
            err_code = nrf_serial_read(&serial_uart, &radar_packet_0, 80, NULL, 20);
        }
        else if(radar_packet_select_number == 1)
        {
            err_code = nrf_serial_read(&serial_uart, &radar_packet_1, 80, NULL, 20);
        }
        else if(radar_packet_select_number == 2)
        {
            err_code = nrf_serial_read(&serial_uart, &radar_packet_2, 80, NULL, 20);
        }
        
        
        if(err_code == NRF_ERROR_TIMEOUT)
        {
        }
        else
        {
            radar_packet_select_number++;
            if(radar_packet_select_number == 2)
                radar_packet_select_number = 0;
        }
        (void)nrf_serial_flush(&serial_uart, 0);
        radar_raw_data_get = 0;
    }
}

Reply
  • 0 in reply to user111786

    Hi.

       I use SDK 14 and I use examples\peripheral\serial  

    I try to fix it. If I move nrf_serial_read(&serial_uart, &buffer, 2, NULL, 100); to main loop. It work very well.

    Below is my source code

    I want to get 80 bytes data. if I only send 30 Bytes data from PC to our device. I will get timeout error code. This is what I want.

    static void serial_event_handler(struct nrf_serial_s const *p_serial, nrf_serial_event_t event)
{
    switch (event)
    {
        case NRF_SERIAL_EVENT_TX_DONE:
            break;
        case NRF_SERIAL_EVENT_RX_DATA:
        {
            radar_raw_data_get = 1;
        }
        break;
        case NRF_SERIAL_EVENT_DRV_ERR:
        break;
        case NRF_SERIAL_EVENT_FIFO_ERR:
        break;
        default:
        break;
    }
}

void main()
{
 for (;;)
    {
        receive_radar_raw_data();
        nrf_pwr_mgmt_run();
    }
    
 }
 
 void receive_radar_raw_data()
{
    uint32_t err_code = 0;
    if(radar_raw_data_get == 1)
    {
        if(radar_packet_select_number == 0)
        {
            err_code = nrf_serial_read(&serial_uart, &radar_packet_0, 80, NULL, 20);
        }
        else if(radar_packet_select_number == 1)
        {
            err_code = nrf_serial_read(&serial_uart, &radar_packet_1, 80, NULL, 20);
        }
        else if(radar_packet_select_number == 2)
        {
            err_code = nrf_serial_read(&serial_uart, &radar_packet_2, 80, NULL, 20);
        }
        
        
        if(err_code == NRF_ERROR_TIMEOUT)
        {
        }
        else
        {
            radar_packet_select_number++;
            if(radar_packet_select_number == 2)
                radar_packet_select_number = 0;
        }
        (void)nrf_serial_flush(&serial_uart, 0);
        radar_raw_data_get = 0;
    }
}

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