CORDIC-ARCTAN

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gary36

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I am looking for a verilog Code for arc tan function. I am recieving DC sine/cosine from 16 bit ADC. INput ranges for ADC are 0 to +/-5V. I need 16 bit fixed point implemetation.
Could anybody provide pointers ( btw: required for all 4 quadrants and to be implemented in FPGA)
 

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Hello,
there is one implementation in SystemVerilog on Opencores.org:

https://opencores.org/projects/cordic_atan_iq

Regards
 

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I tried to check with the C code and then tranlsating to verilog. Below is one. Why does this code not work?
 

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  • cordic_fixed_point.txt
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In the code , you may notice that test angle is 30 deg ( sine theta =0.5,cos theta= 0.866). I get 43 deg instead.
 

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Could locate the error. It is in the Tan table. Now scaled all values to Q15 and now works very well.
 

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