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36 lines
1.1 KiB
Markdown
36 lines
1.1 KiB
Markdown
---
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title: "WDT"
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aliases:
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- firmwareapi/pycom/machine/wdt.html
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- firmwareapi/pycom/machine/wdt.md
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- chapter/firmwareapi/pycom/machine/wdt
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---
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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.
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## Quick Usage Example
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```python
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from machine import WDT
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wdt = WDT(timeout=2000) # enable it with a timeout of 2 seconds
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wdt.feed()
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```
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## Constructors
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### class machine.WDT(id=0, timeout)
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Create a WDT object and start it. The `id` can only be `0`. See the init method for the parameters of initialisation.
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## Methods
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### wdt.init(timeout)
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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.
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### wdt.feed()
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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.
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