| Author | beginning argument ( Replies received: 2 ) |
| kounst |
 Posted 27-07-2008 at 14:52 |
Registered on :
07-27-2008
Messages : 2
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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
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| woro |
Posted 28-07-2008 at 10:21 |
Registered on :
07-17-2003
From Germany
Messages : 189
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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
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| kounst |
Posted 28-07-2008 at 10:56 |
Registered on :
07-27-2008
Messages : 2
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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
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capture interrupt return