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Re: [avr-chat] Passing parameters to asm functions
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From: |
Joerg Wunsch |
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Subject: |
Re: [avr-chat] Passing parameters to asm functions |
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Date: |
Thu, 20 Mar 2008 16:56:13 +0100 (MET) |
Kreyl <address@hidden> wrote:
> It seems that compiler passes params in r24 and r25 in most cases,
> and sometimes uses Y pointer. Where exactly should I know what to
> use?
That's called the ABI (application binary interface), and is
documented in the FAQ:
http://www.nongnu.org/avr-libc/user-manual/FAQ.html#faq_reg_usage
--
cheers, J"org .-.-. --... ...-- -.. . DL8DTL
http://www.sax.de/~joerg/ NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)