capture interrupt return

kounst · ‎2008-07-27

Posted on July 28, 2008 at 07:26

kounst · ‎2008-07-27

Posted on July 27, 2008 at 11:22

Hello,

I'm trying to measure out a pwm signal using the input capture of timer a.

The interrupt is triggert but the micro seems to hang up when it should return from ISR.

my code:

void TIMERA_IT_Routine(void){

unsigned char Temp;

/* Insert your code here... */

Temp = TAIC1HR;

Temp = TACSR;

Temp = TAIC1LR;

}

By now the ISR should do nothing but return.

I hope somebody can help me!

Regards

wolfgang2399 · ‎2008-07-27

Posted on July 28, 2008 at 06:51

Hi Kounst,

to generate an 'IRET' instead of a 'RET' at the end of your routine, you have to qualify this routine as interrupt routine. You can do it with

at COSMIC:

@interrupt void TIMERA_IT_Routine(void){...

at Metrowerks (Hiware):

#pragma TRAP_PROC or #pragma TRAP_PROC SAVE_REGS

void TIMERA_IT_Routine(void){...

Ensure that all the used registers have been saved! Read the manual to find out how to do this with your compiler.

Regards,

WoRo

kounst · ‎2008-07-27

Posted on July 28, 2008 at 07:26

Danke!! :)

That was not really the solution but it helped me find the actual problem.

my code was:

@interrupt

...

extern int count;

void ISR{}

So ''@interrupt'' wasn't missing but ''extern int count'' may not stand in between.

Best Regards