vTimerSetTimerID
[Timer API]

timers.h

 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.

Parameters:

xTimer	The timer being updated.
pvNewID	The handle to which the timer's identifier will be set.

Example usage:

/* A callback function assigned to a timer. */
void TimerCallbackFunction( TimerHandle_t pxExpiredTimer )
{
uint32_t ulCallCount;

    /* 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. */
    ulCallCount =
        ( uint32_t ) pvTimerGetTimerID( pxExpiredTimer );
    ulCallCount++;
    vTimerSetTimerID( pxExpiredTimer, ( void * ) ulCallCount );
}