They're just wigling a pin to show you that you can do something while you're
waiting for a key to be received. The 'input' is to get the current state of
the pin so that the opposite can be output.

Phil

"John C. Frenzel" wrote:
>
> I was going to use CCS's KBHIT function.  In the example on pg 46 of the
> manual they have the following code fragment
>
> keypress=' ';
> while ( keypress!='Q' ) {
>     if ( kbhit () )
>         keypress=getc();
>     if (!input(PIN_B2))     <--------------What is this for??
>         output_high(PIN_B3);
>     else
>         output_low(PIN_B3);
> }
>
> Is the serial input line is on pin B2?
>
> Any other ideas?
>
> Thanks,
> John