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void vTimerSetTimerID( TimerHandle_t xTimer, void *pvNewID );
An identifier (ID) is assigned to a software timer when the timer is created, and can be changed at any time using the vTimerSetTimerID() API function.
If the same callback function is assigned to multiple timers, the timer identifier can be inspected inside the callback function to determine which timer actually expired.
The timer identifier can also be used to store data in the timer between calls to the timer’s callback function.
xTimer The timer being updated. pvNewID The handle to which the timer’s identifier will be set.
/* A callback function assigned to a timer. */
void TimerCallbackFunction( TimerHandle_t pxExpiredTimer )
/* A count of the number of times this timer has expired
and executed its callback function is stored in the
timer's ID. Retrieve the count, increment it, then save
it back into the timer's ID. */
( uint32_t ) pvTimerGetTimerID( pxExpiredTimer );
vTimerSetTimerID( pxExpiredTimer, ( void * ) ulCallCount );