Hi Giorgio,

Since the asmembler version of that algorithm can be extremely well
optimized to the point of not being readable the C version may help you
out.   I picked it up from a very old Embedded Systems magazine which I
no longer have.  It's much faster than the Newton Raphson method.

Cheers,

John


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Giorgio De Nunzio
> Sent: Saturday, March 30, 2002 11:49 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: 24 bit square root on a 16f84
>
>
> >>>>>>>>>>> John Dammeyer wrote
> ...
>
> Thanks for your help, John! In point of fact I was looking
> for a (already
> optimized) asm routine, not C, but as it seems that I will
> have to convert/adapt/write down the routine myself, your C
> function may be useful! Thanks! Giorgio
>
>
> >>>>>>>>>>> Scott Dattalo wrote:
>
> > Andy David (the author of the routine to which you refer),
> based his
> > algorithm on the 16-bit routine I wrote for the midrange family:
>
> Thanks, Scott! Sometime during the night I have found your
> useful pages, and I was studying the routine. I admit that -
> having so little time to play - I hoped to find a
> ready-to-use 24 bit routine, but I am sitting down with pen
> and paper and I am trying to figure out how things can be
> adapted to my problem.
>
> > I'd like to say that extending the 16-bit routine to 24 bits is
> > straight forward. Unfortunately, I don't like to lie. If I extended
> > it, I'd probably go to 32-bits and optimize when needed for 24-bits.
>
> OK, thanks for your advice.
>
> Giorgio
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply
> us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body
>
>
>
>

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body