Strange UART behaviour

[Raiyans]

Hello fellow devlopers.

I am experienceing very odd behaviour from the UART peripheral. I am trying to ouput a uint8_t[48] array from the UART termainl. I am using this simple code

while (i <48) 
{
uint8_t UART_Val;
UART_Val = Meta_data[i];
NRF_UART0->TXD = UART_Val;
while (NRF_UART0->EVENTS_TXDRDY != 1)
{
    // Wait for TXD data to be sent.
}
NRF_UART0->EVENTS_TXDRDY = 0;
i = i+1;
}

ofcourse I have prviously defined i as a 0 integer. The thing is, I only get the first 2 or three elements of the array to show up when I run the code. More stragnly, If I debugg the device to see what is wrong, all elements end up showing up. I think this is a case of synchonisation. Does anybody have a comment to add to this. Thanks in Advance.

[Michael Dietz]

You need to trigger a task.

I would try

while (i < 48) {

uint8_t UART_Val; UART_Val = Meta_data[i];

NRF_UART0->EVENTS_TXDRDY = 0;

NRF_UART0->NRF_UART_TASK_STARTTX = 1;

NRF_UART0->TXD = UART_Val;

while (NRF_UART0->EVENTS_TXDRDY != 1) {

// Wait for TXD data to be sent.

}

i++; }

but check out the example uart code in the SDK. and why arent you using that - it simplifies things?

let me know if it works!

-Mike

[Raiyans]

Thank you Michael for your quick reply...I actually am using the exmaple code. I was using the c library stright but ended up coping the fuction into my main code and adjusting it from here as the debugging was easier.. with regard to your code..I am not able to compie as I get an error struct "" has no field "NRF_UART_TASK_STARTTX" :(

[Wojciech Jasko]

NRF_UART0->TASKS_STARTTX = 1;

[Raiyans]

still shows the same behaviour as before. in any case, STARTTX is already set in the simple_uart_config function