UARTE can't receive data

[Dave_couling]

I've been playing around with the UART drivers on SDK 15.2.  No issues with the Legacy (w/DMA) however I've tried switching over the NRFX_UARTE driver and I can't get the driver to Recieve data.  The Rx Event is never called in the handler, nor does nrfx_uarte_rx_ready() ever return true?   The only real difference in the driver API's is the legacy driver has the nrf_drv_uart_rx_enable(.) call which isn't in the NRFX_UARTE module.  Is there anything I could have missed that would prevent data receiving on this driver?

p.s. in the sdk_config file I did enabled NRFX_UARTE and NRFX_UARTE0.  Also commented out the Legacy #defines as per requirements for other drivers

[Jørgen Holmefjord]

Hi,

Can you post the code you used for configuring UARTE, and setting up the transfers? I'm not sure what the purpose of the function nrfx_uarte_rx_ready() is in the driver, to me it seems that using this function only makes sense to use together with nrfx_uart_rx_enable() in the legacy UART driver for polling UART.

Best regards,
Jørgen

[Dave_couling]

static nrfx_config_t my_uart_config = NRFX_UARTE_DEFAULT_CONFIG

err_code = nrfx_uarte_init( &mu_uarte,
&my_uarte_config ,
my_uarte_event_handler );

APP_ERROR_CHECK(err_code);

nrfx_uarte_rx( &my_uart,
(uint8_t*)my_uart_rx_buffer_assigned,
UART_RX_BUF_SIZE);

With this code, the my_uarte_event_handler is never called.  I've checked that the pin assignment is correct in the board file, and I've disabled flow control

[Jørgen Holmefjord]

Did you set the pins in the config? By default, these are set to NRF_UARTE_PSEL_DISCONNECTED.

I tested this similar code, and I'm able to receive data in the event handler:

#define UART_RX_BUF_SIZE 10
static uint8_t my_uart_rx_buffer_assigned[UART_RX_BUF_SIZE] = {0x00};


static void my_uarte_event_handler(nrfx_uarte_event_t const * p_event,
                              void *                     p_context)
{
    if(p_event->type == NRFX_UARTE_EVT_RX_DONE)
    {
        memset(my_uart_rx_buffer_assigned, 0x00, UART_RX_BUF_SIZE);
    }
}

int main(void)
{
    bsp_board_init(BSP_INIT_LEDS);
    nrfx_uarte_t instance = NRFX_UARTE_INSTANCE(0);
    static nrfx_uarte_config_t my_uarte_config = NRFX_UARTE_DEFAULT_CONFIG;
    my_uarte_config.pselrxd = 8;
    my_uarte_config. pseltxd = 6;


    ret_code_t err_code = nrfx_uarte_init( &instance, &my_uarte_config ,  my_uarte_event_handler );

    APP_ERROR_CHECK(err_code);

    err_code = nrfx_uarte_rx( &instance,
    (uint8_t*)my_uart_rx_buffer_assigned,
    UART_RX_BUF_SIZE);
    APP_ERROR_CHECK(err_code);
    

    while (true) 
    {
        __WFE();
    }
}