I'm attempting to disable irq's for a split second to play
a quick sound with the PWM but my attempts to write a 3-line
function in assembler with GCC have failed so far.
I've pored through GCC docs and read the "Assembler
Instructions with C Expression Operands" section, but while
I have a version that will compile, it only Fatal Reset's an
actual device.
My code so far looks like:
static Word TurnOffInts(void)
{
asm ("move.w %%sr, %%d0" : :);
asm ("ori.w #$0700, %%sr" : :);
asm ("rts");
}
I found some help at
http://www.delorie.com/doc/brennan/brennan_att_inline_djgpp.html
but it deals more with GAS under DJGPP and not GCC. Any help
with what I'm doing wrong (syntax?) would be grealy appreciated.
Thanks,
Daniel.
*** I realize I'm setting myself up for a full flaming from
David Fedor for trying to disable interrupts, and another one
from John Marshall for not wading though more docs and visiting
his super-portal twice daily, but at this point I'm willing to
risk it. ;)
