Microseconds sleep with Leon2

[Arquer Stephane]

Hi,

I try to make a specific function to wake up tasks after some hundreds of µ seconds.
I use the timer 2 of a Leon2 with a resolution set to 50µs , but I obtain a rough result with 200µs more than the request time.
Does anybody have an idea ?

I can't load the timer with a value less than 50, a lower value block the execution.
Is it possible to manage an ISR every 10µs ?

I work with rtems 4.8.0 with the patch 4.8.1diff, and a Leon2.


Thanks for help.

sa




/*****/
rtems_isr handleTimer2(rtems_vector_number vector)
{
	int i;
	TIMER2_TICKS ++;
	
	if (Nbre_Timer_Actifs > 0){
		for (i=0; i < MAX_TIMER; i++)
		{		
			if (TAB_Timer[i].actif) {			
				if (TAB_Timer[i].decompte > 0) {
					TAB_Timer[i].decompte--;
				} else {
					rtems_semaphore_release(TAB_Timer[i].sem_id);
					TAB_Timer[i].actif = FALSE;
				}			
			} /*if*/		
		} /*for*/
	}/*if*/
} /*handleTimer2*/