NRF52832 appears to lock up on weak NFC signal

RE: NRF52832 appears to lock up on weak NFC signal

Jared — Thu, 04 Jul 2024 07:43:00 GMT

Great, just upload the project as a zip when you have it ready.

Have a good holiday!

regards

Jared

RE: NRF52832 appears to lock up on weak NFC signal

underpickled — Wed, 03 Jul 2024 17:27:41 GMT

I'm not on a dev kit, but I bet I could build a stripped down sample that would run on one. Might not have it ready until next week due to the holiday this week, but I'll send something over when I do. Thank you!

RE: NRF52832 appears to lock up on weak NFC signal

Jared — Wed, 03 Jul 2024 08:42:45 GMT

Hi,

Thanks for the elaboration. Are you running this on a devkit? Would it be possible for you to provide a small sample that would reproduce the issue? That would make it much easier for us to investigate it,

[quote user="geode"] After stopping and starting again in the debugger it hardfaults in the MSPL assert handler, but that only happens when I pause using the debugger and then run again or step through the code from this stopping point.[/quote]

This is expected, as the Softdevice controller will automatically assert if the CPU is halted due to real time requirements not being met,

regards

Jared

RE: NRF52832 appears to lock up on weak NFC signal

underpickled — Tue, 02 Jul 2024 20:24:55 GMT

I feel like I've seen the CPU in a couple of different places, but reproducing it today it seems to usually be here:

(specifically it seems to only happen if an NFC read does not complete, but a field is detected). After stopping and starting again in the debugger it hardfaults in the MSPL assert handler, but that only happens when I pause using the debugger and then run again or step through the code from this stopping point. Outside of the debugger I can just leave it and it will sit there until I reset it or power cycle.

I have tried putting the phone close to the antenna after producing this condition but before pausing the debugger, and the FIELDPRESENT bit appears to still be 0.

Also, I can confirm that those log prints I originally posted do not always precede this condition. Sometimes there are no messages at all.

Thanks for the heads up about possible delays. I appreciate the assistance!

RE: NRF52832 appears to lock up on weak NFC signal

Jared — Tue, 02 Jul 2024 12:16:07 GMT

Hi there,

Have you tried halting the CPU when it stops to see where it's stuck?

When it stops, and you move the reader close to the device again, what is the status of the FIELDPRESENT register?

regards

Jared

Note that we are short on staff due to the summer vacation, so expect some delay in the handling of this case.