Watchdog reset detected after Buttonless DFU

RE: Watchdog reset detected after Buttonless DFU

aferm — Mon, 01 Jun 2020 13:41:46 GMT

In case anyone struggles to find this in the documentation like I did, it is here under "Watchdog Reset".

The watchdog must be configured before it is started. After it is started,
the watchdog’s configuration registers, which comprise registers CRV, RREN,
and CONFIG, will be blocked for further configuration.

RE: Watchdog reset detected after Buttonless DFU

aferm — Mon, 01 Jun 2020 13:37:38 GMT

Changing my initial CRV value seems to have done the trick, however after re-reading the documentation I have some concerns about when the watchdog config can be reset. In my use-case the system will be always on, and updated via ble dfu. According to this reset chart I will never be able to change the value of the CRV register via an update in my use-case. Is there a recommended way to handle this? The only way I can see to do it based on this chart is to let the watchdog expire, but then I would boot back into DFU mode until the bootloader's inactivity timeout.

RE: Watchdog reset detected after Buttonless DFU

Hung Bui — Fri, 29 May 2020 12:09:12 GMT

Hi Aferm,

Could you post the code where you start the WDT ?

As Jörg mentioned, CRV can't be changed once WDT started. How do you configure the RREN register ? Have you made sure you write the magic number to all of these RR registers to feed the WDT ?

RE: Watchdog reset detected after Buttonless DFU

Turbo J — Thu, 28 May 2020 20:05:32 GMT

The CRV register cannot be changed once the WDT was running. Try setting it to 10 minutes on activation.