Re: [avr-gcc-list] Using PORTB with variables, PORTB = var

[Ben Jackson]

> void change() {
>   var <<= 1;
> }

That's a shift, not a rotation, so var is going to become 0.

>   while (1) {
>     int var=1;
>     while (var != 0) {
>       PORTB = var;
>       var <<= 1;
>     }
>   }

Also, 'int var' is going to be 16 bits wide, so in this version which
rotates the bit it's going to spend half its time in high bits and
PORTB is going to be 0.