PRD and TSK mixing

Hello everybody,

I just started to work with TMS320DM6437 EVM and code composer.

I create in .TCF file:

-2 periodic tasks(PRD), called each 10 ticks

-1 TSK with à TSK_Sleep(10) at the end of the while loop.

like that:

void PRD_Switch() {
	SEM_pend(&SEM_DIP, SYS_FOREVER);

	SEM_post(&SEM_DIP);

}

void PRD_Led(int nLed){
	SEM_pend(&SEM_LED, SYS_FOREVER);

	//EVMDM6437_LED_on(0);

	SEM_post(&SEM_LED);
}

uint32 count=0;
void TSK_Delay(){
	while(1)
	{
		count++;
		TSK_sleep(10);
	}
}

I put one breakpoint in begening of each fonction and the program enter in each one regulary.

The problem occus when i uncoment this line : "//EVMDM6437_LED_on(0);" in  PRD_Led function.
From that point, the program enters only one time in TSK_Delay () and then never. But it continues entering in PRD_Led and PRD_Switch fonctions regulary.