H.P. de Vries <H.P.d.Vries@stud.tue.nl> wrote:

> I hope someone can help me with this, because I dont have any bright
> ideas right now ;) Is there a nifty little piece of code out there
> what does the same as the "case", e/g/ "switch" statement?
>
> I am creating a MIDI-controller board with a 16-button interface.
> Depending on which button is pressed, I want to branch to another
> pice of code. Who can help??

Hans:

There are many ways to do this... Here's how I usually manage it:

    CASE:

        XORLW   1
        BZ      W_CONTAINED_1

        XORLW   2^1
        BZ      W_CONTAINED_2

        XORLW   3^2
        BZ      W_CONTAINED_3

        etc...

This method takes 3 words (and 3 cycles) per test.  There are
faster/shorter ways, but they generally require your "cases" to be
consecutive numbers.  The method shown above will work with ANY
numbers; it could just as easily have been:

    CASE:

        XORLW   7
        BZ      W_CONTAINED_7

        XORLW   51^7
        BZ      W_CONTAINED_51

        XORLW   12^51
        BZ      W_CONTAINED_12

-Andy

=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499