nrf52 DK: UART problems

[H4NNE5]

Hello,

I integrated the relevant code from the "uart" example into the "ble_app_uart" example(this is all the code in the main routine):

uint8_t cr;        
uart_init();
	printf("\r\nUART Start!\r\n");

  while (true){
		        
    while (app_uart_get(&cr) != NRF_SUCCESS);
    while (app_uart_put(cr) != NRF_SUCCESS);

    if (cr == 'q' || cr == 'Q')
    {
        printf(" \r\nExit!\r\n");

        while (true)
        {
            // Do nothing.
        }
    }
}

Now have the problem that the program is stuck in this line:

while (app_uart_get(&cr) != NRF_SUCCESS);

The return value of the function is not "NRF_SUCCESS".

The echo function in the "uart" example was working fine.

The only difference between the uart_inits of both is uart_error_handle and uart_event_handle and the Flow Control. But even if I set this to enable it won't work:

UART:

BLE_APP_UART:

Also if I flash the code, I can't download the softdevice to the board. Maybe there are conflicts but I have no clue.

Thanks in advance Hannes

[FormerMember]

Could you double check that you have connected the boards correctly together?

TX <--> RX
RX <--> TX

Update 20.03.2017: I have tested similar code here, based on ble_app_uart (SDK 13), and in that case app_uart_get(..) will receive characters from the terminal. Could you test my code, and check if it work on your side? The project should be used with S132 v.4.0.2.

ble_app_uart_UART_only.zip

Update 22.03.2017: APP_TIMER_CONFIG_RTC_FREQUENCY should have the following definition in sdk_config.h.

[H4NNE5]

Do you know what the UART example is doing? It's establishing a connection from the board to the PC using the virtual COM port over USB and echoing UART communication that's coming from the PC. So there's no need to check any connection. Also I wrote that the UART example itself is working fine. Maybe you didn't see that I'm using your Development Kit (PCA10040).

[FormerMember]

Aha, I misunderstood, I thought you connected two nRF52-DKs together.

When you connect the nRF52-DK to a serial port on a PC, does app_uart_get() return NRF_SUCCESS if you send some characters from the terminal to the nRF52-DK? If app_uart_get() returns NRF_ERROR_NOT_FOUND is means that there is no data in the RX buffer.

[H4NNE5]

Yes that's exactly the error I get from debugging. So I guess it must have to do with a wrong configuration, but which? Because I thought I checked all UART configuration between the 2 examples...

[FormerMember]

I have updated my answer.