Why does default ISR get called after you remapped that same ISR?

xxxxxxxxxxxxxxxxxxx

I have mapped the CMP1INT ISR using:

EALLOW;

PieVectTable.CMP1INT = &PWM_ISR;

EDIS;

When I run the code, the default CMP1INT_ISR gets called anywhere from 20 to 40 times, and THEN the PWM_ISR gets called from that point on (without ever going back and calling the default ISR).

Why is this happening?

Which begs the question, why remap a default ISR into a custom-named one? Why not just use the the default ISR?

I am a beginner, so I tried remapping because one of the tutorials I read did so. But I want to know if it's even necessary.

And also how, if possible, can the default ISR NOT be called?

Thanks.

over 12 years ago

0 xxxxxxxxxxxxxxxxxxx over 12 years ago

Prodigy 180 points

I figured it out.

I was doing the remapping after I enabled the interrupt group. Hence, it was calling the default ISR until it got to the remapping.

When I moved the mapping to occur BEFORE enabling the interrupts, then the interrupts occured only in my custom ISR.

0 Jose Henrique de Melo Luna over 8 years ago in reply to xxxxxxxxxxxxxxxxxxx

Prodigy 185 points

Thanks to your message, I was able to find out why my program also stopped at the standard ISR, even pointing to a new interrupt function.

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Why does default ISR get called after you remapped that same ISR?