Re: [avr-gcc-list] strange _BV() stuff

[Torsten Hahn]

Am Dienstag, 15.07.03, um 13:27 Uhr (Europe/Berlin) schrieb Torsten 
Hahn:

> Hi Folk,
>
> i wanted to set the a port on my atmega chip to an specific output 
> using the _BV() macro defined in the avr-libc.
>
> example:
>
> #define DDS_WR 0
> #define DDS_RB 1
>
> ...
>
> PORTB = (_BV(DDS_WR | DDS_RB));
>
> This should set the pin0 and the pin1 of PORTB to high. But it does 
> not !
>
> _BV((DDS_WR | DDS_RB) evaluates to 2, but it should evaluate to 3 if 
> pin0 and pin1 should be set.
>
> Do i miss something ?
>
> avr-gcc --version
> avr-gcc (GCC) 3.2 20020614 (experimental)


OK, i get it.

It has to be

PORTB = _BV(DDS_WR) | _BV(DDS_RB);


stupid mistake, sorry ... :)