nRF Connect Breakpoint -> FATAL ERROR: Platform external interrupt

RE: nRF Connect Breakpoint -> FATAL ERROR: Platform external interrupt

Hung Bui — Thu, 22 Jan 2026 11:33:58 GMT

Hi Charles,
There could be a chance that TF-M may need to handle an interrupt and was stopped because of the debugger causing the failure to continue.
Have you tried to print log instead of break and step in the code ?
The ticket is a year old, please create a new ticket for your question.

RE: nRF Connect Breakpoint -> FATAL ERROR: Platform external interrupt

Charles Manning — Mon, 05 Jan 2026 00:09:05 GMT

Is there any resolution to this issue?

I am seeing exactly the same issue on nRF54L15 development kit. with the same target at exactly the same place in the same tutorial.

The issue only shows up when debugging and continuing from a break point.

In case it matters, I am using the following versions:
*** Booting nRF Connect SDK v3.1.1-e2a97fe2578a ***
*** Using Zephyr OS v4.1.99-ff8f0c579eeb ***

RE: nRF Connect Breakpoint -> FATAL ERROR: Platform external interrupt

Sigurd Hellesvik — Thu, 06 Mar 2025 14:48:05 GMT

I tried to reproduce, and I somehow do not get the same error. Did you compile with debugging options?

RE: nRF Connect Breakpoint -> FATAL ERROR: Platform external interrupt

Ingfu — Wed, 05 Mar 2025 14:33:02 GMT

The breakpoint is after line

ret = k_msgq_put(&device_message_queue,&acc_val,K_FOREVER);

as suggested in the tutorial. I have not observed this in applications without threads.

RE: nRF Connect Breakpoint -> FATAL ERROR: Platform external interrupt

Sigurd Hellesvik — Tue, 04 Mar 2025 14:09:42 GMT

[quote user=""]When I debug with breakpoints and the first breakpoint is hit, everything is fine. When I continue execution, the application crashes and the TF-M terminal shows[/quote]

Is this a breakpoint you set manually? If yes, where?

Also, can you try the same with the Zephyr/hello_world sample?

RE: nRF Connect Breakpoint -> FATAL ERROR: Platform external interrupt

Ingfu — Tue, 04 Mar 2025 13:16:06 GMT

Yes, the example works otherwise

RE: nRF Connect Breakpoint -> FATAL ERROR: Platform external interrupt

Sigurd Hellesvik — Tue, 04 Mar 2025 13:14:25 GMT

Hi,

Does the sample work fine when you just flash it?
Aka: Is the issue only seen when debugging?

Regards,
Sigurd Hellesvik