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CCS/LAUNCHXL-F28379D: Why 28379x_RFFT (DSP library) output and MATLAB output differ?

naveenkumar buduru
Intellectual 650 points
Part Number: LAUNCHXL-F28379D

Tool/software: Code Composer Studio

Hi sir,

Here, I attached both results and First one is the result generated from matlab and second graph from code composer studio.

  • 0
    TI__Mastermind 27200 points
    The data looks the same. You have a peak at 20 in both cases, and the magnitude looks similar. The Matlab sample range is shorter than the data displayed in CCS. Can you check your Matlab script see where it's different from the DSP library implementation?

    Regards,

    Richard
  • 0 in reply to Richard Poley
    Intellectual 650 points
    Hi Sir,

    you are correct in case of Matlab sample range is shorter than the data displayed in ccs but, CCS output expaned upto 256 samples and it should be at least mirror image of the peak at 20. It is showing some unknown peaks after 230th sample.