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FFT speed of computation

JinJun Yu
Prodigy 20 points

Hi,

   I'm having a question  using 6713B-200,  the computing cycle is 1.2ms, in each cycle, 256 points FFT should be computed, but the result is that, FFT computing time is about 2ms. typically, what's the computation speed of 256-FFT?

thanks a lot,  I would appriciate your prompt help.

  • 0
    Prodigy 80 points

    Hi,

    Where did you get the 1.2ms computation time from? Did you use the DSP library TI provided? From the document, it should not take so long to compute an 256-point FFT. Remember all memory you use better be internal for speed.

    Yu-Fu

  • 0 in reply to Yu-Fu Hsieh
    Prodigy 20 points

    Thanks at first, I don't use ti dsplib, my CCS is 2.21.00 version, the dsp67x.lib can not be used, i use mk6x -vm6700 dsp67x.src -l dsp67x.lib to rebuild it ,but get an error : cannot find c16x. 

  • 0 in reply to JinJun Yu
    TI__Guru* 84110 points

    JinJun Yu,

    If you were not using TI's DSPLIB, what were you using for your FFT?

    CCS 2.21.00? That is very old. Can you try updating to CCSv5?I am not sure of its suitability for the DSK6713, however. You may want to search the forum and the TI Wiki Pages for comments from other people who may have asked about this.

    You have typos in your statement here, so I do no know what your problem actually is. The -vm6700 should probably be -mv6700, and there should be no request for c16x but instead for cl6x.

    Regards,
    RandyP