[SOLVED] Recommended method for writing LOG messages during RUNTIME?

[Steph van Schalkwyk]

I've tried ble_app_uart, nrf_serial.c etc. and none seems satisfactory.

I can write to the logger logger/uart during DEBUG, but it doesn't seem to succeed in RUN.

Question:

1. Can SEGGER_RTT be used in RUN build?

2. Can NRF_LOG (_INFO etc.) be used in RUN build, or is it only in DEBUG?

3. I have tried to get nrf_serial.c (nrf_serial_write() etc.) in RUN and I can't seem to get it working.

4. What is the recommended method to get messages out in Runtime?

UPDATE

I am using nrf_serial.c  with UART in legacy mode and set to POLLING. It is writing enough debug data (in RUNTIME) for now.

Caveat: If you're using nrf_serial, make sure your code doesn't have any printf statements - it crashes the code.

I also turned REDIRECT off.

[Vidar Berg]

Hello,

RTT messages are 'printed'  out via the debug interface, so the chip must be in debug interface mode in order for a client to be able to retrieve log messages. I use the attached batch script to get RTT logs on windows when not debugging the project from and IDE.

Attachments: 

Fullscreen 1541.rttlog.bat Download

@echo off
set arg=%1

IF "%arg%"=="" ( 
	echo Error: no device selected.
	EXIT /B
)
REM Jlink (jlinkcommander) enables the debug interface
start cmd /c jlink -device %arg% -if SWD -speed 1000 -autoconnect 1 -CommanderScript %HOME%/run.jlink
REM RTT client listens for RTT messages on telnet port. 
start cmd /c jlinkrttclient

@echo on

run.jlink

[Steph van Schalkwyk]

Which SERIAL method would you then recommend? 

the nrf_serial.c functions?

[Vidar Berg]

The Logger module  should work for 'release' builds. You can change the backend to UART instead of RTT. Or does your application uses the UART interface for something else (only one UART instance on 52832/52810)? Logger backend is selected in sdk_config.h.

[Steph van Schalkwyk]

The UART is unused right now. 

I tried the REDIRECT method yesterday and couldn't get the log to redirect to the UART.

Any guidelines?

[Vidar Berg]

See you marked the question as 'solved', assume you got it to work. Let me know if otherwise.