Re: [avr-gcc-list] simple macro to dig w/ ports

[Colin Wall]

> ----- Message from Jkx <address@hidden> on Thu, 23 Mar 2006 13:52:
> 34 +0100 -----
> 
> To:
> 
> address@hidden
> 
> Subject:
> 
> [avr-gcc-list] simple macro to dig w/ ports
> 
> 
> I'm wondering if one of you have some macros or interesting
> idea to simplifie the sbi/cbi code. A example is nicer than
> a long talk. 
> 
> I want to transform this:
> - sbi(PORTD,PD6)
> - to something like sbi(PD6) (yes i use a the old fashion
>   sbi/cbi code, because I'm a old fashion guy:)
> 
> And I'm wondering if I can extend this kind of stuff to 
> other stuffs like DDR* .. 
> 
> In fact, I'm trying to teach the AVR programming to some 
> newbie, and having to play w/ a bunch of stuffs isn't really
> the best way. 
> 
> 
> Thanks for any help.

Try these macros:
#define pin_high(signal)   \
{                          \
        signal ## _port |= _BV(signal ## _pin);   \
}

#define pin_low(signal)    \
{                          \
        signal ## _port &= ~_BV(signal ## _pin);   \
}

and define your pins like this:
#define LED_port                PORTD
#define LED_pin         PD2

then write code like this:
pin_high(LED);
pin_low(LED);

You have to be consistent with the pin definitions, but it works ok. You 
can extend the idea to include DDR and PIN registers.

Cheers,
Colin

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