Increasing the maximum timeout for Watchdog

[diwakrZha]

For my battery operated application, RPI PICO-W should wake up only every 20 minutes or longer. With maximum timeout for Watchdog timer, 8388 ms, I have to keep feeding much often than necessary?

Is there a way to increase the maximum timeout of the Watchdog? or another way to mitigate possible hangs?

Thanks,

[liamfraser]

This isn't really the intended use of the watchdog. I would recommend setting an alarm on the normal timer which is 32 bits. See https://github.com/raspberrypi/pico-examples/blob/master/timer/hello_timer/hello_timer.c for usage. You can then go into __wfi(); and wait for the timer interrupt to go off.

[diwakrZha]

Thank you for hints. I will definitely use timers for wake up and send data.

Is there still a way to use HW watchdog on RPI Pico w to reset the board in case of unknown bugs or should I totally avoid watchdog?

I am thinking of using asyncio to feed watchdog under 8.3s in loop. Am I thinking wrong here?

[bruelltuete]

the watchdog is clocked by clk_ref. You could change clk_ref to something slower, e.g. rosc (or maybe there's some clock division tricks you could do).

[kilograham]

closing this as there isn't an intention to "fix" anything