trig functions

RS_Jim

Hi, Does anyone know of any available trig functions for the SX in SXB or asm such as ARCSIN,ARCCOS and ARCTAN?· I have a little project that I would like to try if those functions are available. I checked out the libraries but did not find what I was looking for.
Thanks
Jim

JonnyMac

I've only evern done SIN and COS functions to duplicate those in the BS2. You should be able to use these with the the math on Dr. Tray Allen's site to get what you need.

www.emesystems.com/BS2math3.htm

RS_Jim

Thanks Jonny, It never occured to me to use a look up table.· I wonder if that is the way that the BS2 derives sin/cos?
Thanks again, your support of this forum is awesome!
Jim

Bean

Jim,
The BS2 uses CORDIC to compute SIN,COS,ATN, and HYP.

I have used CORDIC to compute ATN and HYP. If you would like to see it, I'll see if I can dig it up. Let me know.

Bean.

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Zoot

Bean, I think this is your code for CORDIC ATAN (but I can't remember if sin/cos were lookup tables) ----

http://forums.parallax.com/showthread.php?p=620457, about halfway down the page.

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Bean

Zoot,
Yep that's it.
Thanks for digging it up.

Bean.

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·The next time you need a hero don't look up in the sky...Look in the mirror.


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RS_Jim

Thanks Zoot and Bean, I had seen tracy's stuff about Cordic and was courious.
Jim