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F28335 fft

Ivan Petric
Prodigy 120 points

Hello,

What is the difference between Fixed point FFT and floating point FFT (both found in Control Suite examples)?

I am asking because as I saw my device, f28335 CAN WORK both with floating point and fixed point so I dont know which example to choose?

What would you suggest me? Which one is more precise? 

Thanks in advance,

Ivan.

  • 0
    Guru 192875 points

    Hi Ivan,

    For you floating point FFT would be more advantageous as F28335 as you might already know has a FPU.


    Regards,
    Gautam

  • 0 in reply to Gautam Iyer
    Prodigy 120 points
    Thanks for quick answer!
    I though so but wanted to check out.

    Can you help me with one more thing:

    I can't find fuction explanaitions for fft lib so I can't see if I can change output buffer size as I want?
    Because in matlab output buffer gives highest frequency at fn/2 (Nicquist frequency/2). I have input buffer with 512 points and I want more precise fft which is why I want to change output size so fft would give me more narrow step with frequencies.

    Can you explain me how does it work (whats the connection with output buffer size and frequencies that I get from fft)?

    Thanks,
    Ivan.