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Re: [avr-gcc-list] Inserting code before context save in an ISR (for nes

From: Paulo Marques
Subject: Re: [avr-gcc-list] Inserting code before context save in an ISR (for nested interrupts)
Date: Mon, 06 Aug 2007 12:56:21 +0100
User-agent: Thunderbird (X11/20070509)

David Carr wrote:
Hi all,

Hi, David

Is there a way to inject a simple sei() into the start of an ISR before
the automatic context save?

This used to be the difference between the "INTERRUPT" and the "SIGNAL" macros.

With a recent gcc / libc, you should declare your interrupt handler as:

ISR(<handler_name>, ISR_NOBLOCK)

to have the whole handler run with interrupts enabled.

I hope this helps,

Paulo Marques
Software Development Department - Grupo PIE, S.A.
Phone: +351 252 290600, Fax: +351 252 290601
Web: www.grupopie.com

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Niels Bohr

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