AVR-Chat

My good old Tektronix 2232 proved your theory correct!

And to think that was going to get rid of it...

I guess that I need to be careful with PC based test equipment.


Thanks again, John!



--- In AVR-Chat@yahoogroups.com, "englsprogeny1" <englsprogeny1@...> wrote:
>
> 
> John, you said "Not trying to teach you anything of course"
> 
> I've been watching you in this group for years.  You could teach me a lot! AND I would willingly learn!
> 
> :)
> 
> Anyways, I must have something wrong with my test equipment.
> 
> I will try my (non-PC-based scope) tomorrow.
> 
> Many thanks!
> 
> 
> 
> 
> 
> --- In AVR-Chat@yahoogroups.com, John Samperi <samperi@> wrote:
> >
> > At 12:00 AM 1/09/2012, you wrote:
> > >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.
> > 
> > hmm something is fishy, maybe your test equipment? :-)
> > 
> > As you have tried different boards and they were working ok
> > before that seems to be the most likely problem.
> > 
> > I'm assuming here that your boards are reasonably made with proper
> > supply bypass and steady supply.
> > 
> > The project I'm currently working on has a 70ms and a 50ms delay and
> > it is very accurate.
> > 
> > Not trying to teach you anything of course but something like this
> > could be handy to check your setup.
> > I have never used anything but the Studio generated makefile so the
> > F_CPU is entered in the project settings.
> > 
> > #include <avr/io.h>
> > #include <util/delay.h>
> > 
> > int main(void)
> > {
> >          DDRD |= (1 << PD4);
> > 
> >          for( ;; )
> >          {
> > 
> >      PORTD |= (1 << PD4);
> >      _delay_ms(500);             //Max 65.535 seconds with latest winAvr
> >          PORTD &= ~(1 << PD4);
> >      _delay_ms(500);
> >          }
> > }
> > 
> > 
> > 
> > 
> > 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
> > ********************************************************
> >
>