RE: [avr-gcc-list] Strange delay behavior

[Per-Tore Aasestrand]

Hello,

At 23:20 06.07.2007, Eric Weddington wrote:


> > -----Original
> Message-----
> > From:
> > address@hidden
> >
> [
> mailto:address@hidden.
> > org] On Behalf Of Per-Tore Aasestrand
> > Sent: Saturday, June 09, 2007 12:06 PM
> > To: address@hidden
> > Subject: [avr-gcc-list] Strange delay behavior
> >
> > Hello list,
> >
> > I've suddenly run into something odd. I am using AVR Studio
> > Version 4.12 Service Pack 4 with WinAVR 20060421. Have been
> > using this setup for a while without any problems.
> >
> > Now, running the following test program on a ATmega128 @ 8
> > MHz, produces pulses on PC3. However, with 'off' period of
> > 1,45 ms and 'on' period of 2,45 ms and. I had of course
> > expected 1ms and 2 ms, respectively.
> >
> > I ran the same program using CodeVision, and then the periods were
> OK.
> >
> > Guess I've overlooked something.
> > Any idea, someone?
>
> What's your optimization setting (-O) ?

Yes, it was -O!! ;-)

Are there some guidelines for proper use of optimization
settings?

This message was sent to the list about one month ago. I was quickly
tipped off to check the optimization setting. For some odd reason, it
popped up again today. Wonder what happened.

Per-Tore





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