dsp.FFT does not work with HDL coder

조회 수: 3(최근 30일)
Anze Slosar
Anze Slosar 2022년 8월 30일
댓글: Kiran Kintali 2022년 9월 8일
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 2022년 9월 5일
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.
  댓글 수: 2
Kiran Kintali
Kiran Kintali 2022년 9월 8일
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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