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Re: [avr-gcc-list] Re: [avr-libc-dev] RFD: more avr-libc API changes

From: Branislav Katreniak
Subject: Re: [avr-gcc-list] Re: [avr-libc-dev] RFD: more avr-libc API changes
Date: Fri, 9 Sep 2005 15:06:43 +0200
User-agent: Mutt/1.5.9i

> >That would also be fine. Any macros would be better than explaining 
> >the '&=~'-nightmare.
> I support it,
> in fact i already have something like this (for personal usage, since 
> it's not in RC1 stage yet)
> If anyone interested in an alpha stage header : 
> http://szm.no-ip.com/~szir/gcc/mydata.h
> Maybe we should wait for Eric's version of bit.h.

I found very handy macros that abstract from PORTx, DDRx and PINx
registers and encapsulete them with macros like

#define IOM_INIT_HI( port, mask )
do {DDR##port&=0xff^(mask);PORT##port&=0xff^(mask);} while (0)

#define IOM_INIT_PULL( port, mask )     
do {DDR##port&=0xff^(mask); PORT##port|=(mask);} while (0)

//open collector 0
#define IOM_SET_OK_0( port, mask )      DDR##port|=(mask)

//open collector 1
#define IOM_SET_OK_1( port, mask )      DDR##port&=0xff^(mask)

for initializing the port into either of
- hi impedance
- pullup
- zero
- one

for setting logical value in these modes
- zero/one (TTL)
- zero/hi impedance (open collector)
- zero/pullup (open collector with pullup)

and for reading the port value.

I have variants with bit mask, bit number and for the whole port. My
code is not release ready, but I can clean it up. The biggest issue is
with names of macros.


Branislav Katreniak

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