[Zephyr] Recommended unexpected exception handling method

[phipi]

Hi all, I would like to implement a fault handler in our nRF9160 based system to handle hard faults/unhandled exceptions by resetting the system, but am having a hard time finding where to locate the standard Cortex M fault handlers to call NVIC_SystemReset().

Is this the best way to handle this and if so where can I find these handlers?

[Didrik Rokhaug]

Hi.

Zephyr has a fatal fault handler called k_sys_fatal_error_handler, which can be implemented by the application. The declaration (and some documentation) can be found here: https://github.com/NordicPlayground/fw-nrfconnect-zephyr/blob/master/include/fatal.h#L83

With a default (weak) implementation here: https://github.com/NordicPlayground/fw-nrfconnect-zephyr/blob/master/kernel/fatal.c#L36

There were several changes in Zephyr's fatal error handling when they changed to v2.0. You can find the relevant pull request here: https://github.com/zephyrproject-rtos/zephyr/pull/17544

Best regards,

Didrik