sine routines

"CBarn24050" <cbarn24050@aol.com> wrote in message
news:20040117055417.12966.00000182@mb-m02.aol.com...
> hi, this is the simplification of the compound angle formulas, it works
very
> well and can be quite quick but not as fast as a lookup table.

in context: I had to drive a stepper motor around 1 metre diameter circles
with an accuracy of 0.1 mm using a 2K EPROM


========
original post:
I am sorry, terribly busy, but you can get there from here (I had to)

circles ( and sines, fit for your purpose) using only add and subtract

X = 100: y = 0

FOR   i = 1 TO 1000

PRINT X, y

X = X - y / 256
y = y + X / 256

 NEXT

If you cannot do it I will dig out the Scamp (INS8060) code, eventually.

David F. Cox
======

In article <4006935e$1@news.nb.nu>
           mhsprang@NOcustomSPAMware.nl "Meindert Sprang" writes:

> "CAFxX" <cafxx@n-side.it> wrote in message
> news:bu634c$7g9$1@lacerta.tiscalinet.it...
> > what i need to do is to generate a custom-frequency sine wave to be
> > outputted at CD-quality frequency (44100 samples/second) to a DAC.
> 
> If that is all you have to do, take a look at Analog Device's DDS chips.

He could also do a search on DDA routines. These are simple add and
shift routines that can often be done in a few machine cycles. John
Matthews book has an example in for this (Engineering Applications
in Forth). 

-- 
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