Re: [avr-gcc-list] newbie interrupts question

[Lars Noschinski]

* Eric Smith <address@hidden> [2006-05-08 07:58]:
> My question is this:  how do I set up this interrupt vector table using C?
> Or, if I have to mix assembly with C to do it, that's fine -- but can you
> tell me (show me) explicitely how to do it?

You just declare your interrupt handlers using for example

ISR (TIMER2_COMPA_vect) {
   ...
}

The vector table is automatically setup

> I have to be able to set up the interrupt vectors such that when my timer
> reaches zero, and the interrupt is generated, the appropriate routine is
> called.  Also, I'm assuming that if I enable interrupts I'll need vectors
> for all available interrupts even if I'm only going to use one, is that
> right?

You need an handler for every enabled interrupt. But setting the global
interrupt enable bit does only enable interrupt handling, the specific
interrupts need to be enabled seperatly.