AVR-Chat

Fuse Settings:

LOW Byte
FF

High Byte
D9


I looked at an online fuse calculator:

http://www.engbedded.com/fusecalc/

Everything looks ok.





--- In AVR-Chat@yahoogroups.com, STEVEN HOLDER <s.holder123@...> wrote:
>
> What are your fuse settings ?
> 
> Regards
> 
> 
> 
> ________________________________
>  From: englsprogeny1 <englsprogeny1@...>
> To: AVR-Chat@yahoogroups.com 
> Sent: Friday, 31 August 2012, 15:00
> Subject: [AVR-Chat] Re: delay time is not reliable
>  
> 
> Â  
> I have the same issue with a different board and build process.
> 
> I've done this on my ATMega8 board now, building the HEX file using make.
> 
> crystal 8Mhz
> 
> I put the F_CPU value in the makefile as well as the global.h file.
> 
> I program the ATMega8 board by way of ISP then unplug the programmer from the ISP header.
> 
> When I look at the signal, I get between 0.9 and 2.1ms (about)for a call for 5ms.
> 
> When I try 10ms delay, I get between 2 and 4ms delay.
> 
> An interesting note: 
> 
> When I call the microsecond delay I am solid!
> 
> _delay_us(333);
> 
> Whatever value I tell it to wait, it is exact!
> 
> :)
> 
> So milliseconds does not work but microseconds does....
> 
> --- In AVR-Chat@yahoogroups.com, John Samperi <samperi@> wrote:
> >
> > At 03:26 PM 31/08/2012, you wrote:
> > >2.  F_CPU is set correctly
> > >#define F_CPU          7372800
> > 
> > But is this what you have in the project settings? _delay_ms is pretty
> > accurate if it has the correct information.
> > 
> > Are you using your own makefile or the Studio generated one?
> > 
> > 
> > 
> > Regards
> > 
> > John Samperi
> > 
> > ********************************************************
> > Ampertronics Pty. Ltd.
> > 11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
> > Tel. (02) 9674-6495
> > Website http://www.ampertronics.com.au
> > *Electronic Design * Custom Products * Contract Assembly
> > ********************************************************
> >
> 
> 
>  
> 
> [Non-text portions of this message have been removed]
>