UARTE lost a byte after uarte disable and enable again.

[Jing Luo]

Hi,all~

void gpio_evt_handler(nrfx_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    switch (pin_no)
    {
        case   PIN_NRF_SLEEP:
        {
            if(! nrf_gpio_pin_read(PIN_NRF_SLEEP) )
            {
                drv_uart_enable();
                app_master_led_state_change(LED_ON);
            }else{
                drv_uart_disable();
                app_master_led_state_change(LED_OFF);
            }
        }
        default:
            break;
    }
}

The program runs on nRF52833. At the beginning, MCU sends data to nRF52833 through serial port, and the data can be received correctly(pic one）. When I use THE GPIO control module to disable and enable the serial port again, the MCU is sending data, you can see that the UARTE0 register is missing the seventh byte of data(see pic two).The SDK version is NRF5_SDK_17.0.2_D674DDE.

pic one:

pic two:

PC send log:

[Timor]

I figured out that i also need to start the receiver (NRF_UART0->TASKS_STARTRX = 1) after enabling the UART. It doesn't explain the strange behavior of losing the 7th byte but it works.

Should i have further issues with this i will open a new case as you suggested.

Thanks.

[hmolesworth]

Relying on a pin transition and assuming it only happens once (even if debouncing is supposedly handled) without checking the state often leads to unexpected behavior. Perhaps try something like this to avoid enabling an enabled uart (even if that's supposed to be benign):

    if( !nrf_gpio_pin_read(PIN_NRF_SLEEP) && uart_is_disabled() )

Might not help but generally good practice