Hi Adam,
Thanks for your email. I never knew about Opencores before, this is
really cool!
Just remember that you will need to properly pipeline the CORDIC
function i.e. it will take longer than 1 clock cycle for the data to
be valid. I think I had 4 or 5 cycle pipeline delay.
This is something I did not consider at all, so thats definitely
something I need to look at. I'll play around with this and let you know
if I get it working.
Thanks again,
Eoin.
On 2021-12-13 14:11, Adam Isaacson wrote:
Dear Eoin,
It has been a while since I played with the cordic algorithm. I used
this for Radar signal processing in the day. The Xilinx should work,
but if not try opencores.org [1] and look for arithmetic operations.
Refer to https://opencores.org/projects/cf_cordic. I can't remember
the exact Cordic algorithm I used back then, but it was from Opencores
and it did work well on the Altera FPGAs.
Just remember that you will need to properly pipeline the CORDIC
function i.e. it will take longer than 1 clock cycle for the data to
be valid. I think I had 4 or 5 cycle pipeline delay.
I hope this helps!
Kind regards,
Adam
On Mon, Dec 13, 2021 at 2:55 PM baldwin <[email protected]> wrote:
Hi Guys,
Quick question; I'm just wondering what is the best way to calculate
arctan on the FPGA? I am currently using the Xilinx CORDIC block to
take
I and Q and use them to calculate phase, but have found this to give
unreliable data. While it sometimes gives out the correct phase
value,
it often just gives completely nonsensical results. Just wondering
if
anybody else has ever had similar issues.
All the best,
Eoin.
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