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Re: [avr-gcc-list] inline asm problem
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From: |
Clemens Buchacher |
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Subject: |
Re: [avr-gcc-list] inline asm problem |
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Date: |
Fri, 13 Feb 2004 01:59:50 +0100 |
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User-agent: |
Mutt/1.5.5.1+cvs20040105i |
On Thu, Feb 12, 2004 at 09:18:37AM +0800, whiteman wrote:
[...]
> error message "pwm.c:27: error: impossible constraint in
> `asm'". what's meaning?
> My inline asm is :
> asm volatile("sbi 0,1" : "=I"(PORTC) : "I"(6));
The sbi instruction uses I/O register addresses, so you will have to use
_SFR_IO_ADDR(PORTC) if PORTC is in this address range (see
<avr/sfr_defs.h> for details). If it is not, you cannot use the sbi
instruction at all.
hth,
Clemens