UART interrupt

[Hossam]

Hi nice people, I am working on developing using visual studio and Make environment. I am trying to function UART  tx/rx interrupt works but no luck. The TX and RX works perfect in blocking mode but it is not on interrupt mode. I am going to provide snippets of blocking and non blocking codes.

************************** Blocking mode *****************************************

void UART_run_blocking_test(void)

{

    nrfx_uart_config_t uart_conf = {

    .baudrate           = UART_BAUDRATE_BAUDRATE_Baud9600,

    .hwfc               = NRF_UARTE_HWFC_DISABLED,

    .parity             = NRF_UARTE_PARITY_EXCLUDED,

    .pseltxd            = UART_TX_PIN,

    .pselrxd            = UART_RX_PIN,

    .pselcts            = NRF_UART_PSEL_DISCONNECTED,

    .pselrts            = NRF_UART_PSEL_DISCONNECTED,

    .p_context          = NULL,

       

    };

    nrfx_uart_init(&uartInstance, &uart_conf, NULL);

    uint8_t txd;

    while (1)

    {

        nrfx_uart_rx(&uartInstance, &txd, 1);

        nrfx_uart_tx(&uartInstance, &txd, 1);

    }

}

************************** Non Blocking mode *****************************************

static void uart_callback (nrfx_uart_event_t const * p_event, void *p_context)
{
(void*) p_context;

switch (p_event->type)
{
case NRFX_UART_EVT_TX_DONE:

break;

case NRFX_UART_EVT_RX_DONE:
nrfx_uart_rx(&uartInstance, &txd, 1);
break;

case NRFX_UART_EVT_ERROR:

break;

default:
break;
}

}

void UART_run_non_blocking_test(void)
{
nrfx_uart_config_t uart_conf = {
.baudrate = UART_BAUDRATE_BAUDRATE_Baud9600,
.hwfc = NRF_UARTE_HWFC_DISABLED,
.parity = NRF_UARTE_PARITY_EXCLUDED,
.pseltxd = UART_TX_PIN,
.pselrxd = UART_RX_PIN,
.pselcts = NRF_UART_PSEL_DISCONNECTED,
.pselrts = NRF_UART_PSEL_DISCONNECTED,
.p_context = NULL,
.parity = NRF_UARTE_PARITY_EXCLUDED,
.interrupt_priority = NRFX_UART_DEFAULT_CONFIG_IRQ_PRIORITY,
};

nrfx_uart_init(&uartInstance, &uart_conf, uart_callback);
nrfx_uart_rx(&uartInstance, &txd, 1);
volatile uint32_t d;
while(1)
{
}
}

can u help?

[Edvin]

Hello,

For future correspondance, please use the "Inser"->"Code" when you intend to paste large code snippets, as it makes it easier to read. 

In general, if you haven't tested, I can recommend the UART implementation from the SDK\examples\ble_peripheral\ble_app_uart example.

If you want to use the nrfx_uart_init() directly, what does nrfx_uart_init() return?

If you want to use the non-blocking uart, I also suggest that you test the nrfx_uarte_init, instead of nrfx_uart_init(). Again, look at the implementation from the ble_app_uart example. You can follow the definitions:

uart_init() (from main.c) ->

APP_UART_FIFO_INIT() ->

app_uart_init() ->

nrf_drv_uart_init() ->

nrfx_uarte_init()

Best regards,

Edvin

[Hossam]

thank you for replay edvin

it returs nrf_succes 

Edvin said:

what does nrfx_uart_init() return?

i did and the same result 

Edvin said:

If you want to use the non-blocking uart, I also suggest that you test the nrfx_uarte_init, instead of nrfx_uart_init()

i followed that example 

Edvin said:

You can follow the definitions:

let me add more:
-  the code works perfect in blocking mode.
- when transmitting, the first time it sends successfully but after that becomes busy all the time and not issuing a complete flag to trigger the interrupt 

[Edvin]

Hossam said:

i did and the same result 

What was the result?

Hossam said:

i followed that example 

Not exactly, because the ble_app_uart uses nrfx_uarte_init(), and not nrfx_uart_init().

Did you test the unmodified ble_app_uart example?

BR,
Edvin

[Hossam]

I wrote above that i got the same results after changing the APIs from UART to UARTE

[Edvin]

I think you misunderstood my question.

what does nrfx_uart_init() return means that if you create a variable, uint32_t err_code; and set it equal to the return value of nrfx_uart_init()/nrfx_uarte_init(), what is the value of err_code after that?

uint32_t err_code;

err_code = nrfx_uarte_init();
NRF_LOG_INFO("err_code = %d", err_code);

So, what was the result (err_code) after nrfx_uarte_init()?

And did you test the unmodified ble_app_uart example? Are you telling me that that doesn't work either? If so, what hardware are you using?