AVR-Chat

Oh, wait.... I see.  It gets optimized away because the while loop 
does not do anything.  Therefore the need to insert a nop.

-got it....

-Tony

--- In AVR-Chat@yahoogroups.com, "arhodes19044" <spamiam@c...> wrote:
> If the compiler optimizes it away, then it thinks that USCRA is 
not 
> volatile.  So.... can you declare somehow that UCSRA is volatile?
> 
> However, I have never had the problem with references to hardware 
> registers being optimized away....
> 
> -Tony
> 
> --- In AVR-Chat@yahoogroups.com, "Lasse Madsen" 
<lasse.madsen@e...> 
> wrote:
> > Hi.
> > 
> >  
> > 
> > Your problem is most likely that the compiler optimizes the line
> > while(!(UCSRA&(1<<UDRE))); away.
> > 
> >  
> > 
> > Try this instead.
> > 
> >  
> > 
> > while(condition=true)
> > {
> >   while(!(UCSRA&(1<<UDRE)))
> > 
> >   { 
> > 
> >   #asm("nop");               // or how ever your compiler 
accesses 
> assembly
> > inside C.
> > 
> >   }
> > UDR=data
> > }
> > 
> >  
> > 
> > Regards 
> > 
> >  
> > 
> > Lasse Madsen
> > 
> >  
> > 
> >  
> > 
> >  
> > 
> >   _____  
> > 
> > From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] 
> On Behalf
> > Of aswinefy2003
> > Sent: 1. juli 2005 13:35
> > To: AVR-Chat@yahoogroups.com
> > Subject: [AVR-Chat] help problem in uart
> > 
> >  
> > 
> > i have the following code written in iccavr
> > 
> > 
> > while(condition=true)
> > {
> > while(!(UCSRA&(1<<UDRE)));
> > UDR=data
> > //delay();
> > }
> > the problem is when i remove the delay()routine ,atmega32 is not 
> > transmitting the correct data ,but any how transmitting some 
> > garbage .Please help
> > 
> > 
> > 
> > 
> > 
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