.. zephyr:code-sample:: watchdog
:name: Watchdog
:relevant-api: watchdog_interface
Use the watchdog driver API to reset the board when it gets stuck in an infinite loop.
Overview
********
This sample demonstrates how to use the watchdog driver API.
A typical use case for a watchdog is that the board is restarted in case some piece of code
is kept in an infinite loop.
Building and Running
********************
In this sample, a watchdog callback is used to handle a timeout event once. This functionality is used to request an action before the board
restarts due to a timeout event in the watchdog driver.
The watchdog peripheral is configured in the board's ``.dts`` file. Make sure that the watchdog is enabled
using the configuration file in ``boards`` folder.
Building and Running for ST Nucleo F091RC
=========================================
The sample can be built and executed for the
:zephyr:board:`nucleo_f091rc` as follows:
.. zephyr-app-commands::
:zephyr-app: samples/drivers/watchdog
:board: nucleo_f091rc
:goals: build flash
:compact:
To build for another board, change "nucleo_f091rc" to the name of that board and provide a corresponding devicetree overlay.
Sample output
=============
You should get a similar output as below:
.. code-block:: console
Watchdog sample application
Attempting to test pre-reset callback
Feeding watchdog 5 times
Feeding watchdog...
Feeding watchdog...
Feeding watchdog...
Feeding watchdog...
Feeding watchdog...
Waiting for reset...
Handled things..ready to reset
.. note:: After the last message, the board will reset and the sequence will start again
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