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November 28th, 2018, 07:51 AM  #1 
Member Joined: Aug 2017 From: India Posts: 50 Thanks: 2  Best Possible Implementation
I am not sure if I can put it in this forum, but I want to know your valuable feedback. I have to implement transforms like Clarke, Park and some other mathematical calculations for Field Oriented Control. These algorithms I am implementing in micro controllers which run at 160MHz. The most critical thing is how efficiently I implement them in terms of timing. The functions like sqrt, tan if I take from it from library will take lot of cycles. Which is the shortest and the high precision way of implementing these algorithms like Inv(tan), sqrt etc? Please advise. Any look up table kind of solution?
Last edited by skipjack; November 28th, 2018 at 10:28 AM. 
November 28th, 2018, 10:20 AM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,324 Thanks: 1233 
A lookup table will be the fastest but you say you want high precision as well. Can you restrict the domains of the functions you need to implement? Do you have a lot of memory to play with? If you can't just do a table lookup and get the precision you need you could linearly interpolate adjacent values if your table were accurate enough. You'll do better looking and google and chasing down links and references than just asking here. Or perhaps ask on a more computational engineering site. Last edited by skipjack; November 28th, 2018 at 10:30 AM. 
November 28th, 2018, 06:04 PM  #3 
Member Joined: Aug 2017 From: India Posts: 50 Thanks: 2 
Yes memory is available.


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