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Watchdogs are timers that reset the device if they are not manually restarte, a.k.a. kicked. The watchdog is initialized by the bootloader thanks to some config.yml macros. Moreover the watchdog is setup to a different time windows at startup. In an infinite loop the sleeping time is always increased until it is longer than the watchdog window and the device resets.

More information about modules used in this demo:

import watchdog
import mcu

# Set Watchdog timeout after 15 seconds.
watchdog.setup(0, 15000)

print("Hello Watchdog!")

# Check is the watchdog triggered.
trig = mcu.reset_reason() == mcu.RESET_WATCHDOG
print("Triggered: ", trig)

delay = 1000

while True:
    print("Delaying for ", delay)
    delay = delay + 8000

Watchdog is enabled by adding the macro ZERYNTH_EARLY_WATCHDOG into config.yml

# config.yml