Checking the include file PB1 is shorthand for PORTB1 - ie pin 1 on the port
- and is defined as the number 1. Therefore (1<<PB1) translates as 1 left
shifted 1 place (ie 2), which creates a bit mask for pin 1. IMO it should
really be written (1<<PINB1), since that's what it's creating the mask for.
Effectively that statement is testing pin 1 on port B.

On 3/6/07, Mauricio Jancic <info@janso.com.ar> wrote:
>
> Hi,
>         I modifying a C code for an ATMEL chip, and I found this
> statement:
>
> if(!(PINB & (1<<PB1)))
>
>         Whats that? Specially the (1<<PB1) that I cant seem to figure
> out...
>
> Regards,
>
> Mauricio
>
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