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M G_2
M G_2
Associate III
July 3, 2018
Solved

FFT Performance

  • July 3, 2018
  • 2 replies
  • 1516 views
Posted on July 03, 2018 at 13:48

I’ve setup a DSP application including a F32 FFT that takes on STM32F407 about 5 ms and on a STM32F429 approximately  .5 ms. The clock settings are in both cases the highest possible values (STM32F407 -> 168 MHz and STM32F429 -> 180 MHz) Did I something wrong in case of the STM32F407 or is the performance difference between both the µC that high ?

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    Best answer by AvaTar
    Posted on July 03, 2018 at 14:01

    The block sizes and compiler settings are identical ?

    The 0,5ms for the F429 sound unreasonable for large block sizes.

    2 replies

    AvaTar
    AvaTarBest answer
    Senior III
    July 3, 2018
    Posted on July 03, 2018 at 14:01

    The block sizes and compiler settings are identical ?

    The 0,5ms for the F429 sound unreasonable for large block sizes.

    M G_2
    M G_2Author
    Associate III
    July 3, 2018
    Posted on July 03, 2018 at 14:35

    Hi and thankyou for responding. After double checking the compiler settings and also the lib which I’ve included it looks like that I've included the wrong lib:

    arm_cortexM4l_math.lib . After including the arm_cortexM4lf_math.lib instead the performance increased significantly. On a stm32f407 a 1024 pt F32 FFT now takes about 668 µs which is close to the result achieved in AN4841 for the STM32F429 of about 547 µs.
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