topic Re: SWO TRACE in Kinetis Microcontrollers

SWO TRACE

LArmstrong1985 — Tue, 05 May 2020 10:22:16 GMT

Good morning,

is possible to use SWO Trace with OpenSDA on Kinetis K64 board?

And if I use a second board as a SWD programmer?

What I have to do to enable it?

Thank you very much!

Re: SWO TRACE

ErichStyger — Tue, 05 May 2020 10:27:54 GMT

OpenSDA does not support SWO.

You need an external debug probe which is capable dealing with SWO, e.g. see ARM SWO Performance Counters | MCU on Eclipse

See as well:

Tutorial: Using Single Wire Output SWO with ARM Cortex-M and Eclipse | MCU on Eclipse

I hope this helps

Erich

Re: SWO TRACE

LArmstrong1985 — Tue, 05 May 2020 12:58:44 GMT

Kinetis board as external debugger has SWO pin that I can use it to SWO Trace is right?

swo-trace-connected-to-debug-header.png

Do I also have to do something on firmware/project to allow its use?

Re: SWO TRACE

ErichStyger — Tue, 05 May 2020 15:49:28 GMT

No, you cannot use an external Kinetis as debugger to take advantage of the SWO pin, as that external Kinetis boards would run OpenSDA. As pointed out below: it is not possible to use SWO with OpenSDA because the OpenSDA firmware does not support SWO. The hardware (debug connector) would support it, but not the OpenSDA.

So: you need an external debug probe capable for SWO, either a SEGGER, a P&E or a LPCLink2 probe (as shown in above article).

You don't have to do anything in your application/firmware: the probe firmware will handle everything.