[ilyt]

There is a caveat here, it won't stop your app from crashing before the watchdog activation. Some CPUs have fuse that can enable watchdog before any code starts running but the ARMs I played with (STM32) don't appear to have that option.

[shabble]

At least some STM32s do, see page 89 of the STM32F4xx reference manual[1], the option bits 5:7 at 0x1fffc000 let you activate the hardware watchdog immediately following reset if you wish.

[1] https://www.st.com/resource/en/reference_manual/rm0090-stm32...