UART + RTT LOG Setup

RE: UART + RTT LOG Setup

Einar Thorsrud — Thu, 22 Sep 2022 13:04:32 GMT

Hi,

[quote user="Toni Alomar"]I am receiving message "no Ok!" in RTT viewer. Why am I getting error?[/quote]

I don't know. Can you print the error code as well? That should give some hints.

[quote user="Toni Alomar"]Could you help me developing a simple tx/rx using nrf_drv_uart library?[/quote]

The SDK has the UART driver and several UART libraries built on top, I would think you should be able to use one of those. Building your own does not immediately seem like a good idea (and if you want to do so, that is up to you).

RE: UART + RTT LOG Setup

Toni Alomar — Wed, 21 Sep 2022 16:44:27 GMT

Thanks Einar,

I solved the ERROR 8 with what you said. Now I am having trouble transmiting. I am doing this:

char toSend[2] = {'X','E'};

uint32_t err_code = nrf_drv_uart_tx(&m_uart, &toSend[0], 2);
if(err_code = NRFX_SUCCESS){
  NRF_LOG_INFO("OK!");
}else{
  NRF_LOG_INFO("no OK!");
}
APP_ERROR_CHECK(err_code);

I am trying to send two characters via UART. I am receiving message "no Ok!" in RTT viewer. Why am I getting error?

I understand I am using the most low level UART library and I do so because the app_uart is getting me into a lot of trouble because of dependencies... I did start my project from ble_app_multilink_central_pca10040 example. When I tried to add app_uart_fifo.c and everything I started having a lot of problems.

Why is that uart not working?

Could you help me developing a simple tx/rx using nrf_drv_uart library?

Thanks!

RE: UART + RTT LOG Setup

Einar Thorsrud — Mon, 19 Sep 2022 08:32:17 GMT

Hi,

You are getting NRF_ERROR_INVALID_STATE returned from nrf_drv_uart_init(), which means that UART is already enabled. Logging is enabled beforehand, so I suspect you have enabled the UART backend for nrf_log? If so, you need to modify sdk_config.h so that NRF_LOG_BACKEND_UART_ENABLED is set to 0.

As you write you want RTT logging you also need to ensure you set NRF_LOG_BACKEND_RTT_ENABLED to 1, and I also recommend you set NRF_FPRINTF_FLAG_AUTOMATIC_CR_ON_LF_ENABLED to 0.

RE: UART + RTT LOG Setup

Toni Alomar — Fri, 16 Sep 2022 17:20:38 GMT

I want to add that line 60 is uncommented in the uploaded code.