Custom nRF5340 board not logging debug statements to JLinkRTTViewer

RE: Custom nRF5340 board not logging debug statements to JLinkRTTViewer

Kazi Afroza Sultana — Tue, 29 Apr 2025 14:05:06 GMT

That's great! 🙂

RE: Custom nRF5340 board not logging debug statements to JLinkRTTViewer

lcj — Sat, 19 Apr 2025 18:40:23 GMT

It seems to be working. I ran it a few times and I think the config statement did it. I don't know why it didn't the first one or two times, but it seems to work pretty regularly now. Thank you.

RE: Custom nRF5340 board not logging debug statements to JLinkRTTViewer

lcj — Tue, 15 Apr 2025 10:07:59 GMT

When I debug, I am in VS Code and press the debug button in nrfConnect (add-in), I get prompted to select core from the command prompt and select app, I open (or select) the jlink rTy app and connect. I see the debug messages.

Otherwise I do a pristine build in VS Code on the nrfConnect add-in, when done I press flash, when done I open (or select) jlink rtt viewer, I connect, which seems to work, but get no messages.

RE: Custom nRF5340 board not logging debug statements to JLinkRTTViewer

Kazi Afroza Sultana — Tue, 15 Apr 2025 08:23:29 GMT

''Now when I run in debug mode, I get the printing in JLink RTT Viewer but when I build and flash I don't.'' How do you build and flash? Do you mean you can not get any output on other serial terminal like putty or no output on Jlink RTT viewer?

Can you show me some output log or screenshot from your output terminal?

RE: Custom nRF5340 board not logging debug statements to JLinkRTTViewer

lcj — Mon, 14 Apr 2025 17:18:03 GMT

I added these to the prj.conf

CONFIG_CONSOLE=y
CONFIG_LOG_BACKEND_UART=n

Now when I run in debug mode I get the printing in JLink RTT Viewer but when I build and flash I don't.

RE: Custom nRF5340 board not logging debug statements to JLinkRTTViewer

Kazi Afroza Sultana — Mon, 14 Apr 2025 16:25:12 GMT

Hello,

RTT link viewer has several ports, sometime if it does not work for one terminal it can work for another. Did you try all? The first step you can do to check if any other serial terminal is open in your system. Try to close it and open the J-Link RTT viewer again.

You can also try to add these CONFIG_CONSOLE=y and CONFIG_LOG_BACKEND_UART=n in the prj.conf file.