AVR-Chat

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
> 
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