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In this basic watchdog example, the application is expected to define a Watchdog callback function and start the Watchdog timer by calling Watchdog_open(). If needed, Watchdog_setReload() may be called to change the timeout period. If all monitored tasks are doing alright, Watchdog_clear() should be called regularly to reload the counter so as to restart the timeout period and to avoid the Watchdog interrupt being triggered. If the Watchdog_clear() is missed and the Watchdog timer is allowed to timeout, the user-defined callback function is called. In this function, the user may do whatever is appropriate for the application. Here are some suggestions:
do nothing so that the timer will timeout again and trigger the reset
immediately reset the device
do self-test to check the integrity of the application
