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TAN SIN COS trigonometry in assembly, PIC18F4520

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doucheful80

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Hi,

Is there an assembly code for arctan..or tan-1 that can be used in PIC18F4520 or others.
Im doing a robot that follow an x,y coordinate..so i need to calculate the angle from the input x,y to turn the robot's wheels

Thanks a lot!
 

Hello!

Don't compute! Use a lookup table. It's faster and accurate enough for that kind of application.

Dora.
 
I would agree with Dora.


A lookup table is usually preferable to calculating an inverse trigonometric or transcendental function on the fly.

The following a discussion of lookup tables in PIC Assembly:



Lookup Table faster?



However, if you absolutely must calculate arcTAN on the fly, the a CORDIC Algorithm would probably be my recommendation.

Arctan(x) using CORDIC


You might also find the following algorithm of interest:

XY vector to integer degree fast algorithm

BigDog
 

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