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[avr-libc-dev] atmega32 and interrupt handler problem

From: Andrew S
Subject: [avr-libc-dev] atmega32 and interrupt handler problem
Date: Tue, 15 Jan 2008 20:56:43 -0700
User-agent: KMail/1.9.6 (enterprise 0.20070907.709405)

I have been having a problem the last couple of days, I'm hoping someone here 
has some advice:

I am trying to write a simple interrupt handler for handling a TIMER2 
comparison interrupt. I placed this at the top of my code:

  PORTD ^= 0x40;

The Timer registers were initialized as appropriate, and interrupts (as well 
as the appropriate mask) were enabled. The interrupt was being generated, but 
the interrupt handler routine defined above was not being run, instead the 
microcontroller was being reset.

I was able to get the interrupt handler to run by adding the following code:
ISR_ALIAS(__vector_default, TIMER2_COMP_vect);

Confirming that the interrupt was being generated, but not being handled 

Investigating this further, I found that the following corresponded with the 
microcontroller running the correct interrupt handler for the interrupt in 
{ .. }

Examining iom32.h, TIMER2_COMP_vect has been defined as _VECTOR(4). The 
difference (unconfirmed) being that $008 is the interrupt vector address and 
4 is the index number? Can someone with more knowledge explain whats going on 

Andrew S.

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