RE: How to handle watchdog reset flag in application code?

Aashyk — Fri, 10 Mar 2023 06:00:04 GMT

Solution for this problem is using NRF_POWER->GPREGRET register in the bootloader when watchdog reset flag is set in the NRF_POWER->RESETREAS register. This works since the NVIC_systemreset() doesn't reset the GPREGRET register. The documentation on which registers get reset when NVIC_systemreset() is called would be very helpful for future reference.

int reset_reason = NRF_POWER->RESETREAS;
if (reset_reason & (1UL << 1)) { // 2nd bit for watchdog reset and 3rd bit for softreset
 // The watchdog timer caused the reset
 NRF_POWER->GPREGRET = 0x10; //Custom magic number chosen for watch dog reset
}