Get hold of the microchip Embedded control handbook - it contains a couple
of application notes (like AN526 - PIC16C5X / PIC16Cxxx Math utility
routines and AN544 - Math utility routines PIC17Cxx) with code for
multiply/divide, numerical integration/differentiation and square root.

The application notes can also be found as .pdf files on the microchip
website.

Cheers
 Roland

----- Original Message -----
From: Phu T. Van <tux@L7.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, February 01, 2000 8:03 AM
Subject: Math, part II


> Thanks for all your help. I think part (most/all?) of my dilema lies in
> the fact that I'm using the PIC, small-ish in both memory and raw
> processing power. But I'm also lacking a very fundamental thing : the
> knowledge of how to do elementary math with the PIC's very limited
> insruction set, specifically its bit-wise operations.
> How do you, for example :
> --Multiple/divide ?
> --Calculate exponents ?
> --Anything taught in Elementary Algebra ?
>
> Is it futile to hope that previous PIC gurus had written concise,
> dummy-oriented tutorials on how to do these operations ? Obviously
> someone has had to multiply and divide with a PIC once in their life. It
> frustrates me slightly that I can't do these basic things, even though
> it appears to me that PIC programs follow the formula :
> code,code,code,miracle,code.
>
> Thanks again.
> --Phu T. Van
> P.S. : I've dug up some information on the CORDIC algorithm. Is there
> any way to implement it (painlessly, if possible) on the 16F84 ? The
> page claimed it was successfully used on the Basic Stamp II, which is I
> think more powerful than the PIC.
>