How to calculate inverse sin ?

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jeet55
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Posted by jeet55: Fri. Dec 20, 2019 - 10:04 AM
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How do i calculate inverse sine on atmega32? I dont need floating point , the calculation should be fast.

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AVR Microcontrollers, megaAVR and tinyAVR
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Brian Fairchild
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Posted by Brian Fairchild: Fri. Dec 20, 2019 - 10:05 AM
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Look up table is the fastest. Smaller look-up table with interpolation the next fastest.

#1 Hardware Problem? https://www.avrfreaks.net/forum/...

#2 Hardware Problem? Read AVR042.

#3 All grounds are not created equal

#4 Have you proved your chip is running at xxMHz?

#5 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand."

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avrcandies
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Posted by avrcandies: Fri. Dec 20, 2019 - 10:22 AM
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How do I calculate inverse sine on atmega32?

How accurate do you want it (both inputs and outputs)?  

you could get 

 

invsin(707) ==>450  (equiv to 0.707) ==> 45 deg

invsin(7071)==>4499 (equiv to 0.7071==> 44.99 deg

 

do a search for CORDIC

https://www.allaboutcircuits.com/technical-articles/an-introduction-to-the-cordic-algorithm/

 

https://www.youtube.com/watch?v=Ze4UnE8R4FM

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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