Stuck in "Hard fault Debug event" after debug session

RE: Stuck in "Hard fault Debug event" after debug session

Vidar Berg — Mon, 19 Jan 2026 08:55:52 GMT

nick_bike , thank you for sharing your findings! I think we may be able to avoid or mitigate this problem in the extension. I will relay this to the team.

RE: Stuck in "Hard fault Debug event" after debug session

vincent_itk — Mon, 19 Jan 2026 08:08:47 GMT

If you can't remove battery, maybe you can erase or recover the DUT before trying to debug again ?

You should consider further upgrading your DUT with a removable or at least disconnectable power source to be able to power cycle it.

RE: Stuck in "Hard fault Debug event" after debug session

nick_bike — Sun, 18 Jan 2026 00:07:20 GMT

I'm also having ghost debug events but can't power cycle as the battery is soldered on the DUT. Solution appears to be to enter debug mode and run the code, at which point it'll stop on one of your debug lines - but you won't see the breakpoint as active. Enable the breakpoint on the line, run code again, observe it stops on the same line. Delete breakpoint. Observe it doesn't stop on that line - it might stop on another, which means you have multiple ghost breakpoints. Continue until the code runs without breakpoints. Then exit debug gracefully and reflash.

RE: Stuck in "Hard fault Debug event" after debug session

Vidar Berg — Fri, 07 Nov 2025 12:36:26 GMT

Thank you for the update. It's good to have a workaround for this. I will try to find the root cause for this if I find a way to reproduce this on my end.

RE: Stuck in "Hard fault Debug event" after debug session

vincent_itk — Thu, 06 Nov 2025 14:00:14 GMT

Hello,

Got the same behaviour and power-cycle the board make it working properly.

I was able to get rid of the hard this way.

Thanks.

RE: Stuck in "Hard fault Debug event" after debug session

Vidar Berg — Tue, 28 Oct 2025 06:48:39 GMT

Thank you. Yes, it would be good to know how to reproduce this.

RE: Stuck in "Hard fault Debug event" after debug session

vincent_itk — Mon, 27 Oct 2025 16:45:36 GMT

Thanks for the tip.

Gonna try it when the case occurs again. Will let you know in this thread.

Regards

RE: Stuck in "Hard fault Debug event" after debug session

Vidar Berg — Mon, 27 Oct 2025 15:00:24 GMT

Hello,

I need to investigate this to understand why this fault happens. As a test, please try to power-cycle the board (+ disconnect and re-connect debug probe if you are using an external one) and see if this clears the breakpoint at this address.

Best regards,

Vidar