Watchdog: run a routine before reset

[makouda]

Im using nrf51, I configured the watchdog to reset after 3 seconds of hang and it works. But I have absolutely to save some data in flash before reset

Is there anyway to do that knowing that I sometimes get hangs (is there any standard routine executed at hang which I can modify to save data on flash)

[Vidar Berg]

Unfortunately, it not possible. Please have a look at Einar's answer in this thread.

[awneil]

RAM is not cleared by a reset, provided the power remains OK. So you could set aside an area of RAM to be not initialised by your startup, and use that to save your data over the reset....

But, if you "know that you sometimes get hangs", that's is a bug that you really need to fix!!