Re: [avr-gcc-list] Cicrular Buffer routines

[David Kelly]

On Aug 16, 2005, at 6:07 PM, Bob Paddock wrote:

> You can test to make sure that you do have a power of two buffer  
> size with the
> following:
>
> #define myQ_SIZE    64
>
> #define myQ_MASK ( myQ__SIZE - 1 )
> #if ( myQ__SIZE & myQ__MASK )
>  #error myQ_SIZE buffer size is not a power of 2
> #endif

Wouldn't it be easier to simply define the size like this:

#define myQ_SIZE    (1<<6)

If you shift a 1 then it must be a power of 2.

--
David Kelly N4HHE, address@hidden
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