Re: AW: [avr-gcc-list] Interrupt handling

[Theodore A. Roth]

On Wed, 26 May 2004, Oliver Schulz wrote:

> Hi Kreyl,
>
> Can you try this:
> SIGNAL (SIG_OVERFLOW0)
> {};
>
> Notice the braces.

That will work, but you get all the prologue and epilogue register
saving/restoring (i.e. un-needed overhead).

The avr-libc <avr/signal.h> header provides an easy way to handle this:

  EMPTY_INTERRUPT(SIG_OVERFLOW0)

Notice the lack of semicolon. I just tested and it works with or without
the semicolon. Remember that this is essentially a function definition,
so the semicolon at the end seems to be optional.

---
Ted Roth
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