dsp.FFT does not work with HDL coder

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Anze Slosar
Anze Slosar 2022-8-30
评论： Kiran Kintali 2022-9-8
Hi,
I have a code and a testbench code that I'm trying to convert to VHDL.
The code uses FFT. When I use canned FFT, I get "Function 'fft' not supported for fixed point conversion" at "Verify" step of Fixed Point Conversion".
When I instead use dsp.FFT it instead complains about ' "dsp.FFT" cannot be displayed ' at the Analyze step of fixed point converions.
I cannot use dsphdl.FFT since we don't have the license for that.
Can this be solved or do we need to buy dsphdl.FFT?
Incidentally, is there a real-to-complex FFT, taking N real points and returning N/2+1 complex ones like FFTW or np.fft.rfft in python? Using complex FFT on real data wastes resource by a factor of 2, but all the examples seem to be using that.
Thanks,
anze

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Kiran Kintali
Kiran Kintali 2022-9-5
dsphdl.FFT ships with DSP HDL Toolbox.
You can also find some examples of how to write custom FFT in MATLAB suitable for HDL Code Generation in the attached examples.
  2 个评论
Anze Slosar
Anze Slosar 2022-9-8
Thanks for this, this is also quite useful to illustrate some other concepts.
But surely, I should not need to write custom FFTs in 21st century. Presumably I can count on dsphdl.FFT to produce an optimal result for radix-2 problem and also correctly optimize for real input?
Kiran Kintali
Kiran Kintali 2022-9-8
Yes, those requirements are supported out of the box. Check the Performance section of dsphdl.FFT for additional details related to optimizations. It covers topics related to real inputs and output ordering.

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