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Re: [avr-gcc-list] generating a delay

From: Daniel O'Connor
Subject: Re: [avr-gcc-list] generating a delay
Date: Mon, 24 Oct 2005 17:21:13 +0930
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On Mon, 24 Oct 2005 16:37, varsha wrote:
> Hello all,
> I'm working on avr-gcc (GCC) 3.4.3
> Atmega 16 controller, clock frequecy is 8 MHz,
> and i want to generate a delay of 25ms.
> and i wrote one routine for the same..
> and called it in other function as
> delay(250,0xff);
>  what is the proper way to write a delay routine?

You should tell the compiler that i & j are volatile otherwise it will 
optimise your loop out of existance because it has no effects.

If you want a nice an accurate delay loop you should write it in assembly.

Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
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