topic Re: SWO Tracing with MCUXpresso and Zephyr in MCX Microcontrollers

SWO Tracing with MCUXpresso and Zephyr

Oskar1 — Fri, 07 Feb 2025 15:58:20 GMT

Hi,

I want to trace our Zephyr based firmware with the SWO port of the RT1061 through a J-Trace interface, In the first step I try to get the logs through this interface. I setup the appropriate registers on the MCU and see the logs with JLinkSWOViewer.

After that I imported the Zephyr project into MCUXpresso by following this guide: https://www.nxp.com/docs/en/training-reference-material/BUILD-YOUR-FIRST-ZEPHYR-APPLICATION-ON-I.MX-RT.pdf?_gl=1*1epzb0p*_ga*MTE4MzM2NDEuMTczNzM4Mjg0MA..*_ga_WM5LE0KMSH*MTczODkzMTM4OS4xNC4xLjE3Mzg5MzE3NDIuMC4wLjA.

Everything worked as expected and I can start debugging. But I can't use the trace functions. When trying to setup the Trace Config there are no options I can use, everything seems to be disabled, at least the views are looking completely different for me than in all the documents I've read so far.

I setup the speed in the debug configuration and activated all related SWO settings but to no avail.

Does anyone have some hints?

Regards
Oliver

Re: SWO Tracing with MCUXpresso and Zephyr

Harry_Zhang — Sat, 08 Feb 2025 10:28:26 GMT

Hi @Oskar1

If logs appear in JLinkSWOViewer but not in MCUXpresso, MCUXpresso might not be configured correctly to capture SWO.

May I ask if you could use CONFIG_ITM=y
and CONFIG_ARM_SWO=y in prj.conf?

Harry

Re: SWO Tracing with MCUXpresso and Zephyr

Oskar1 — Mon, 10 Feb 2025 06:30:52 GMT

May I ask if you could use CONFIG_ITM=y
and CONFIG_ARM_SWO=y in prj.conf?

Both options are not recognized by Kconfig:

prj.conf:6: warning: attempt to assign the value 'y' to the undefined symbol ITM prj.conf:7: warning: attempt to assign the value 'y' to the undefined symbol ARM_SWO

I tend to your first point that MCUXpresso might not be configured right. Maybe there is something missing that must be manual configured because I use Zephyr and not a native MCUXpresso project?

Re: SWO Tracing with MCUXpresso and Zephyr

Harry_Zhang — Thu, 13 Feb 2025 02:10:50 GMT

Hi @Oskar1

You can try to Check MCUXpresso Trace Views
MCUXpresso should provide an SWO Console and other trace-related views:
1. Go to Window > Show View > Other.
2. Look for:
• SWO Console
• SWO Data

3. If these are missing or empty, MCUXpresso may not be properly reading the trace data.

Harry