MPC5xxxのトピックRe: MPC5674F PIT not trigerring interrupt

MPC5674F PIT not trigerring interrupt

vincentbergeron — Thu, 30 Apr 2015 13:00:11 GMT

Hello,

I am trying to configure the PIT timer in order to trig an interrupt. I am using the InctInterrupt.h and InctInterrupt.c from the Code Warrior 10.6. Here is a sniplet of code to init pit and add a function to the interrupt vector:

initPit(){

PIT.MCR.R = 0x00000001; // Enable pit and freeze during debug

PIT.CH[1].LDVAL = 40000000; // 1 second interrupt for 40 MHz clock

PIT.CH[1].TCRL.R = 0x00000003; // Start timer

}

INTCInterruptFn pitIntFnct(){

SIU.GDPO[PIN_NUMBER].R = !SIU.GDPO[PIN_NUMBER].R; // Toggle pin

PIT.CH[1].TFLG.B.TIF = 1; // Reset interrupt flag

}

int main(){

initPIT();

INTC_InitINTCInterrupts();

INTC_InstallINTCInterruptHandler(pitIntFnct(), 302, 1); // PIT[1] is on vector number 302. Priority 1.

while(1){

}

For some reason, the funtion is not trigerred when the PIT[1] flag is set to 1. Do you have any idea why???

Regards

Re: MPC5674F PIT not trigerring interrupt

PetrS — Mon, 04 May 2015 10:53:50 GMT

Hi,

Install interrupt handler in this way…

INTC_InstallINTCInterruptHandler((INTCInterruptFn)pitIntFnct,304,1); /* vector304 for PIT3 */

For your case the “pitIntFnct” is called first and then wrong address is placed to the vector table.

Also do not call INTC_InitINTCInterrupts() explicitly, it is already called from user_init(); see e.g. MPC5674F_init_ram.c.

Regards,

Petr

Re: MPC5674F PIT not trigerring interrupt

vincentbergeron — Mon, 04 May 2015 13:51:20 GMT

Thanks,

I am able to see in memory that the correct address is set. However, the interrupt is triggerred only once and then , the INTC_CPR is not resetted to 0 (initial value). The value 1 stays in the register and I think once the second interrupt is generated (after 2 seconds), the intc doesn't acknowledge it since it has the same priority as in the INTC_CPR register. When writing 0 to INTC_EOIR register, doesn't it supposed to pop from LIFO the previous interrupt INTC_CPR value ????

regards,

Re: Re: MPC5674F PIT not trigerring interrupt

PetrS — Wed, 06 May 2015 11:52:33 GMT

Try attached example. Is that also not working for you?

BR,

Petr