How to enable UART or RTT logging in examples?

RE: How to enable UART or RTT logging in examples?

ryerye120 — Thu, 19 Mar 2020 23:35:49 GMT

Yes, my error had to do with the log_deferring option! I disabled it and then it worked!

RE: How to enable UART or RTT logging in examples?

Jørgen Holmefjord — Mon, 16 Mar 2020 10:00:53 GMT

Are you initializing the log module and the backends in your main() function?

ret_code_t err_code = NRF_LOG_INIT(NULL);
APP_ERROR_CHECK(err_code);

NRF_LOG_DEFAULT_BACKENDS_INIT();

RE: How to enable UART or RTT logging in examples?

ryerye120 — Fri, 13 Mar 2020 18:42:17 GMT

I'm having a similar issue. I'm using SDK16 and developing on the nrf52840 DK.

I followed the instructions in this video: https://youtu.be/uP8RYgYGRvI?t=179 in addition to the addendums on this thread as well as this other thread: https://devzone.nordicsemi.com/f/nordic-q-a/58414/enabling-nrf_log_enabled-to-log-messages-on-debug-terminal . But I'm still not seeing anything in my debug terminal.

Currently, I have enabled NRF_LOG_BACKEND_RTT_ENABLED as well as the NRF_LOG_ENABLED. I have also disabled NRF_LOG_BACKEND_UART_ENABLED just in case. Have I missed something simple?

RE: How to enable UART or RTT logging in examples?

Jørgen Holmefjord — Wed, 04 Mar 2020 08:22:35 GMT

Did you add the source file components\libraries\log\src\nrf_log_default_backends.c to your project? NRF_LOG_ENABLED also needs to be set.

RE: How to enable UART or RTT logging in examples?

Navin — Wed, 04 Mar 2020 08:16:19 GMT

Hello Jorgen,

I can't find NRF_LOG_BACKEND_SERIAL_USES_UART.

I get the error: undefined reference to `nrf_log_default_backends_init'

But I have enabled : #ifndef NRF_LOG_BACKEND_UART_ENABLED
#define NRF_LOG_BACKEND_UART_ENABLED 1
#endif

What could I possibly be missing?

RE: How to enable UART or RTT logging in examples?

Al Bundy — Fri, 07 Apr 2017 11:08:52 GMT

Ok, it works. I though that if NRF_LOG_BACKEND_SERIAL_USES_UART 1 is enabled by default in some examples then NRF_LOG_ENABLED 1 is also enabled by default, but it is not.

RE: How to enable UART or RTT logging in examples?

Jørgen Holmefjord — Fri, 07 Apr 2017 07:17:42 GMT

Hi,

It should be sufficient to set NRF_LOG_ENABLED 1 and either NRF_LOG_BACKEND_SERIAL_USES_UART 1 or NRF_LOG_BACKEND_SERIAL_USES_RTT 1. Note that if NRF_LOG_DEFERRED 1 is set, you also need to process the log buffer using NRF_LOG_PROCESS() or NRF_LOG_FLUSH()

Best regards,

Jørgen