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RE: [avr-gcc-list] How to handle interrupt vectors ?

From: Weddington, Eric
Subject: RE: [avr-gcc-list] How to handle interrupt vectors ?
Date: Wed, 29 Oct 2008 12:03:48 -0600


> -----Original Message-----
> From: 
> address@hidden 
> [mailto:address@hidden
> org] On Behalf Of Charalampos Alexopoulos
> Sent: Wednesday, October 29, 2008 12:43 PM
> To: address@hidden
> Subject: Re: [avr-gcc-list] How to handle interrupt vectors ?
> before i identify what happens when that vector is called i have to
> decide what i want to happen and before i decide that i need to know
> what that vector is. I don't want to change anything at run time. All
> the work will be done at compile time. What i want is the 
> information be
> part of a class in a constant way. I know that it can't be a normal
> constant because ISR is handled by preprocessor  and a constant member
> of a class get its value at compile time. Anyway all this is just to
> talk something about because what i want to know is some information
> about interrupt vectors. Until few days before i didn't know that
> vectors exist in c , since then i have learn some thinks and i want to
> learn more, so i decide to ask in a site that maybe somebody have a
> specific knowledge in the vectors of my interest.

In order to understand how to do it in C++, it would be good if you first 
learned how it is done with C and with the assembly startup code. The source 
code of avr-libc is freely available for you to look through to see how it is 

Look at the ISR() macro in <avr/interrupt.h>.
Look at the startup code in gcrt1.S. This is in assembly.

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