warning question

[Peter Dufault]

On May 11, 2009, at 3:22 , Arnout Vandecappelle wrote:

>>  *IE_CMD_CFG_PROMISC(buf)   = !!promiscuous | manchester << 2;
>
> This means (!!promiscuous) | (manchester << 2).  It looks OK to me,  
> though
> adding parenthases around as I did certainly makes things clearer.
>
> The !! is a trick to make sure you have a 1, not just any non-zero  
> int.
>


I must be tired.  Why would "manchester << 2" be anything well-defined  
in the zero bit?

Peter