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Confirm the FFT library performace

Kaka
Guru 24520 points

Other Parts Discussed in Thread: CONTROLSUITE, C2000WARE

Hi TI Experts,

Please let me confirm the FFT library performance for C2000.
[Question]
Would you teach me the maximum point for FFT?
My customer would like to do the 4096 pt FFT (Complex) for accelerator data.

Best regards.
Kaka

  • 0
    Guru 24520 points
    Hi

    Would you please provide answer for my question?

    Best regards.
    Kaka
  • 0 in reply to Kaka
    TI__Mastermind 20850 points

    Hi,

    There are several different DSP libraries within controlSUITE (or c2000ware), you have

    1. Fixed Point DSP
    2. Floating Point DSP
    3. VCU 

    All libraries are under controlsuite/libs/dsp. Each has a user's guide document that details the size and performance of the FFT. I think the fixed point FFT can do a max of 4096. The floating point library will also be able to do it but you will have to generate the twiddle factors at runtime, and not use the precomputed twiddle factor table that comes with the library.

    Also, if the input is purely real I would recommend using the realFFT as it is quicker.