Re: [avr-chat] Really dumb question about port IO

[Neil Davey]

Shouldn't PORT_PWRGOOD  be equal to PINB instead of PORTB?

so it should read like:

   while((PINB & (_BV(PB6))) == 0)

I might be wrong... long day..

Regards
Neil Davey

address@hidden wrote:
> Hi all:
>
> Port IO has been covered a million times on this list, but I am having a
> really basic prolem with it.
>
> I am trying to read the value of a port pin on a mega128, using the
> following syntax:
>
>     while( (PORT_PWRGOOD & (_BV(PIN_PWRGOOD))) == 0) {
>       if(++i>PWR_TIMEOUT) {return digpower = PWR_OFF;}
>     }
>     return digpower = PWR_ON;
>
> But the function always returns PWR_OFF, even though the pin in question
> has been raised. I have checked and double-checked the #define
> PIN_PWRGOOD and PORT_PWRGOOD values (they are PORTB and PINB6
> respectively, if it matters).  I don't believe I've set the SFR to
> enable the alternative function of the pin, either, and the timeout
> value is huge (something like a couple of seconds, well after the pin
> has gone high).
>
> I must have missed something really basic, surely?
>
> Cheers,
> Matthew van de Werken - Electronics Engineer
> CSIRO E&M - Rock Mass Characterisation - 1 Technology Court - Pullenvale
> - 4069
> p: (07) 3327 4142 * f: (07) 3327 4455 * e: address@hidden
> "We do not inherit the earth from our ancestors, we borrow it from our
> children." 
> -- Native American Proverb
>
>
> _______________________________________________
> AVR-chat mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/avr-chat
>
>   


--
--------------------------------------
Neil Davey
Griffith University

Griffith School of Engineering
Nathan Campus
Phone: 07-3735-7008
Fax: 07-3735-5112

School of Psychology - ACNRC
Mt Gravatt Campus
Phone: 07-3735-3395
--------------------------------------