Unable to view RTT logging output in debug mode but able to do so without debug mode

[Mitch996]

Hi, I'm trying to view some logging out put using the segger RTT viwer whilst running keil's debug mode.

I can view some, incomplete loggins in run time (meaning not all functions seem to give logging output while they should), but I am not able to view any output in debug mode.

This is what I have done or tried:

in sdk_config.h:

setting NRF_LOG_BACKEND_SERIAL_USES_RTT to 1

setting NRF_LOG_ENABLED to 1

setting NRF_LOG_BACKEND_SERIAL_USES_UART to 0

Did I miss anything?

Why doesn't it work?

[bjorn-spockeli]

Is NRF_LOG_DEFERRED enabled or disabled? If its enabled, then you must call NRF_LOG_PROCESS() in the main while loop in order process the queued log messages. The alternative is to disable deferred logging, i.e. the logs are processed in the place where the logger is used. I also recommend using Segger's RTT Client instead of RTT Viewer when you're in debug sessions.