SOFTDEVICE: INVALID MEMORY ACCESS - SoftDevice RAM access violation

[M. David.]

Dear all

I'm using the SD s140 and nRF52840 along with one of the latest SDKs (17...). Everything works fine, I'm able to start advertising and connect, but from time to time I get the "SOFTDEVICE: INVALID MEMORY ACCESS" fault. 

My problem is, that I can't debug with our current setup, but I've rewritten the app_error_fault_handler() and include the "info" parameter in the log. The info is 0x00000000, from the documentation of NRF_FAULT_ID_APP_MEMACC I conclude that its a case of SoftDevice RAM access violation.

I've looked through the forum but only found solutions to issues, if "info" is > 0. So what could the problem in my case?

Best regards

David

[Sigurd]

Hi,

My problem is, that I can't debug with our current setup,

I think it would be difficult to figure this out without being able to debug.

If you are able to debug, you should check if you have any information in the callstack that could reveal why this happened. See e.g. this post  https://devzone.nordicsemi.com/f/nordic-q-a/67168/random-nrf_fault_id_app_memacc-errors/  , and also if any of the MWU->EVENTS_* register are set.

[M. David.]

Thank you for your answer. In the meantime I've changed the setup to be able to debug and I've also found the problem. It had to do with, how I entered/exited ciritical sections, when going to sleep using the nrf-power-management and cpu load monitoring.