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→Activating watchdog
Please note that once started, a watchdog cannot be disabled!
Please note that once started, a watchdog cannot be disabled!
Most of microcontroler do have an hardware watchdog. Once the watchdog started (its timeout set), do not forget to update it (feed it) before it reach the timeout... otherwise it will reset the microcontroler.
Most of microcontroler do have an hardware watchdog. Once the watchdog started (set its timeout), you will have to ping it (feed it) before it reach the timeout... otherwise it will reset the microcontroler.
The example [https://github.com/mchobby/micropython-mydin/blob/main/examples/din_controlers/common/async-watchdog.py async-watchdog.py], visible here below, shows how to activate the watchdog. No need to call the {{fname|din.feed_watchdog()}} because it is already called at every execution cycle of the ''userloop'' .
The example [https://github.com/mchobby/micropython-mydin/blob/main/examples/din_controlers/common/async-watchdog.py async-watchdog.py], visible here below, shows how to activate the watchdog. No need to call the {{fname|din.feed_watchdog()}} because it is already called at every execution cycle of the ''userloop'' .
<syntaxhighlight lang="python">
from mydin import configure
from mydin.pico import Pico3Mod
from mydin.backplane.relays import TwoRelay3Mod
din = configure( Pico3Mod, TwoRelay3Mod )
async def loop( din ):
din.leds[0].off()
# direct access to button state
while din.buttons[0].value()==0: # while pressed
din.leds[0].on()
din.setup( setup=None, loop=loop )
# Watchdog resets if loop() stay locked for 2 sec
din.setup_watchdog( 2000 )
din.run()
</syntaxhighlight>
== Add scheduler task ==
== Add scheduler task ==