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HDL Coder atan / atan2

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TS
TS on 23 Jun 2017
Commented: TS on 5 Jul 2017
Hi, I want to implement an algorithm containing atan2 in HDL with the HDL Coder. The trigonomic function block is supported (hdllib). Atan2 is avaiable for use with CORDIC and fixed point, yet the HDL Coder states that the Block is not supportet. How so?
If the block realy is not supportet, what are my options to implement atan2 or at least atan in HDL using the HDL Coder?

Accepted Answer

Kiran Kintali
Kiran Kintali on 23 Jun 2017
currently, atan2 is supported with single inputs.
CORDIC Atan2 with fixpt inputs is on the roadmap. What is the fixpt input wordlength you expect to use? if it is small wordlength you can use a lookup table. if it is large you are better off using the single precision solution which supports a large dynamic range.
thanks

More Answers (2)

Bharath Venkataraman
Bharath Venkataraman on 23 Jun 2017
You can use the Complex To Magnitude Angle block which does atan2 using CORDIC.
  1 Comment
TS
TS on 5 Jul 2017
Thanks for this idear. Works well

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TS
TS on 23 Jun 2017
Hi, Thanks for the quick answer. And atan is also not supported for fixed point implementation? Please note that im on 2016a so i cant use native floating point support. Is there an integrated way in matlab to generate a lookup table in my desired fixed point format (fixed 16,10)

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