Logging configuration

[Daniel Dakhno]

I am trying to configure the RTT log output for my project and somehow getting less and less log output.

After a few lines, the buffer seems to overrun and no more log is saved during startup.

Hence, my question:

1. What options are relevant for what is logged to RTT?
2. how much is buffered in the RTT log buffer?
3. Is there a way of excluding modules from logging?
4. What do I need to take care of in order to buffer as much logging as possible before I connect the RTT viewer?

[Raoul]

Hi,

To answer questions 1 and 3: RTT is simply a logging back end (instead of say, UART), so most of the options that apply to logging can be found in the docs for the logger module: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.0.0%2Flib_nrf_log.html&cp=4_0_1_3_26

Among other things, you can find info on how to define a log module with a series of macros. This DevZone post summarizes it well:  RE: Configure Log Severity for DFU Modules

Regarding questions 2 and 4, I think the definitions you're interested in are NRF_LOG_DEFERRED_BUFSIZE and SEGGER_RTT_CONFIG_BUFFER_SIZE_UP.

Try increasing them to for example 2048 or 4096 (if you have the available RAM). Here is a similar case:  RTT overflow??

I hope that fixes the issue for you. I primarily work with the nRF Connect SDK so if you have more detailed questions I might have to hand this over to a colleague.

Best regards,

Raoul