nRF52832 watchdog issue

[Dajgoro Labinac]

Hi

I'm trying to implement the watchdog to my project, but I'm having some odd issues. When I power cycle the device the watchdog works fine, but when I program the device through keils Load button (system reset) the device just goes into a limbo state from which it can't recover anymore until I power cycle it, then it works fine again. I've found a similar issue in another post:

https://devzone.nordicsemi.com/question/4575/problem-with-system_reset-and-watchdog/

That post is about the nRF51, but I have the nRF52.

I found two different examples that use the wdt, one is this one:

https://github.com/NordicPlayground/nrf51-watchdog-resetreas-example/blob/master/watchdog_simple/main.c

And the other one is in keils example library that uses the nrf_drv_wdt library.

Both have the same issue.

Edit: The RESETREAS workaround has also issues sometimes.

[Hung Bui]

Hi Dajgoro,

I suspect that when you program the chip using Keil, there is a short period between programming and verifying that can cause an issue because the chip can run for a short period of time there. My suggestion is to trigger a reset using nrfjprog after your program with Keil if you don't want to do power reset. Or simply use nrfjprog to program the chip.