RE: [avr-gcc-list] Sharing interrupts

[Dave Hansen]

From: Pablo Bleyer Kocik <address@hidden>

>  Hello list.
>
>  I was wondering, is there an easy way to register two interrupt vectors 
> with the same interrupt handler? The SIGNAL/INTERRUPT macros expand to a 
> function declaration and function definition header, so it is not possible 
> to assign function pointers with them.

I don't know of any way to do it directly.  But the obvious solution would 
be to write your routine as a normal function and call it from the other 
ISRs, e.g.

  void isr(void)
  {
     // Do what you gotta do
  }

  SIGNAL(SIG_WHATEVER)
  {
     isr();
  }

  SIGNAL(SIG_WHATEVER_ELSE)
  {
     isr();
  }

Another solution might be to write an assembly ISR to jump to the other ISR. 
 I'm less sure of how this would work, but something like

  // In a C file
  SIGNAL(SIG_FOR_VECTOR_X)
  {
     // Do what you gotta do
  }


  ; in an assembly file
  __vector_y:   rjmp __vector_x

This would be faster and require less space, but would make maintenance more 
difficult.

HTH,
  -=Dave

_________________________________________________________________
Tired of slow downloads and busy signals?  Get a high-speed Internet 
connection! Comparison-shop your local high-speed providers here. 
https://broadband.msn.com