This post is older than 2 years and might not be relevant anymore
More Info: Consider searching for newer posts

Power Profiler Kit PPK with DK RTT debug out not working.

Current latest JLink firmware won't allow PPK working with DK RTT debugging.

The cause is the JLink chip on the DUT board won't put the SH_SWO/SH_SWCLK/SH_SWDIO in hi-Z mode when SH_VTG is grounded, which prevents the proper communication between the PPK and the external JLink.

Symptom would be:

  • As soon as DUT JLink was connected (with JLinkExe), the external JLink would fail to communicate with PPK (Power Profiler Kit desktop application fails to connect).
  • After releasing the DUT JLink (exit JLinkExe), the external JLink could talk to the PPK again.

I used the following JLink fw and neither would work:

  • OB-SAM3U128-V2-NordicSemi compiled Jul 24 2017 17:30:12
  • OB-SAM3U128-V2-NordicSemi compiled Nov 14 2016 16:58:29

Work-around would be use ribbon-cables (or flying wires) to bypass the SH-SWO pin (P19-6 on PPK, to P20-6 on PCA10040).

New DK's JLink firmware is needed to fix the issue.

Related