class WDT – Watchdog Timer

The WDT is used to restart the system when the application crashes and ends up into a non recoverable state. After enabling, the application must "feed" the watchdog periodically to prevent it from expiring and resetting the system.

Quick Usage Example

from machine import WDT
wdt = WDT(timeout=2000)  # enable it with a timeout of 2 seconds
wdt.feed()

Constructors

class machine.WDT(id=0, timeout)

Create a WDT object and start it. The id can only be 0. See the init method for the parameters of initialisation.

Methods

wdt.init(timeout)

Initialises the watchdog timer. The timeout must be given in milliseconds. Once it is running the WDT cannot be stopped but the timeout can be re-configured at any point in time.

wdt.feed()

Feed the WDT to prevent it from resetting the system. The application should place this call in a sensible place ensuring that the WDT is only fed after verifying that everything is functioning correctly.