RE: Cannot get watchdog to run on nrf9160

Giannis Anastasopoulos — Mon, 26 Aug 2019 09:01:48 GMT

The first link you provided me with was really helpful, as was the rest of your comment.

Thank you very much

RE: Cannot get watchdog to run on nrf9160

Martin Lesund — Fri, 23 Aug 2019 07:30:05 GMT

Hi Giannis,

If you are new to nRF9160 and NCS I would highly recommend that you go through this tutorial.

The watchdog is a hardware peripheral that is directly connected to the internal reset signals. If the timer expires without the application writing a magic word into the register, it will perform a reset, regardless of the state of the CPU. (Even if you're in a hardfault).

The watchdog has the ability to give an interrupt to the application some 32k CLK cycles before resetting the system, provided that the application is not blocked by a higher interrupt (if in HardFault or busFault, you will be blocked).

The modem runs completely separate from the application, so the watchdog in the application space shouldn't be disrupted by the modem.

The WDT can be configured to run during sleep, or halt when the debugger is connected, as per the CONFIG register:

Regarding a WDT sample, you need to first add WDT to the 'Secure Partition Manager', as shown in this post.

After that, you should be able to run the watchdog in non-secure mode. You can find a sample in "../ncs/zephyr/samples/drivers/watchdog" on how to run and configure it.