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Ann Darkhanova
Ann Darkhanova
Associate II
November 26, 2017
Question

Problems with DSP(Fourier transform)

  • November 26, 2017
  • 2 replies
  • 3709 views
Posted on November 26, 2017 at 06:27

Dear Community,

I'm new to programming and STM32 microconrollers, though, I have to perform FFT of 50Hz voltage.

Well, after defining my core by

ARM_MATH_CM7 in arm_math.h

, I get error messages like:

Fourier\Fourier.axf: Error: L6218E: Undefined symbol arm_radix4_butterfly_f32 (referred from arm_rfft_fo).

Fourier\Fourier.axf: Error: L6218E: Undefined symbol arm_radix4_butterfly_inverse_f32 (referred from arm_rfft_fo).

Fourier\Fourier.axf: Error: L6218E: Undefined symbol arm_cfft_radix4_init_f32 (referred from arm_rfft_init_fo)

Fourier\Fourier.axf: Error: L6218E: Undefined symbol arm_cfft_sR_q15_len128 (referred from arm_rfft_init_qo).

...

Fourier\Fourier.axf: Error: L6218E: Undefined symbol arm_cfft_q15 (referred from arm_rfft_qo).

Fourier\Fourier.axf: Error: L6218E: Undefined symbol arm_cfft_q31 (referred from arm_rfft_qo).

Not enough information to list image symbols.

Not enough information to list load addresses in the image map.

Could you explain what is needed to be fixed?

I use CubeMX+Keil uVision+STM32F746NG.

Hope to hear from you soon, guys.

Ann.

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    2 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    November 26, 2017
    Posted on November 26, 2017 at 17:14

    Libraries\CMSIS\DSP_Lib\Source\TransformFunctions\arm_cfft_radix4_f32.c

    Libraries\CMSIS\DSP_Lib\Source\TransformFunctions\arm_cfft_q15.c

    Suggest you grep source to find functions which you are missing, then add source files to project when they are not within a library file.

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    Ann Darkhanova
    Ann DarkhanovaAuthor
    Associate II
    November 27, 2017
    Posted on November 27, 2017 at 15:42

    Ok, thanks! I see your point. Going to try this.  If something is wrong, I'll be back.

    AvaTar
    AvaTar
    Senior III
    November 27, 2017
    Posted on November 27, 2017 at 15:45

    If I remember correctly, the DSP_Lib came with pre-compiled (linker) libs, usable for Keil. Not sure about the current version.

    And you would need to select the proper lib version.

    Stefan Stenzel
    Stefan Stenzel
    Visitor II
    November 30, 2017
    Posted on November 30, 2017 at 11:02

    There might be a faster and simpler alternative to using the CMSIS supplied FFT routines:

    https://github.com/Stenzel/FFT4CM4F

    Have not yet tried on a Cortex-M7 though.

    Disclaimer: I made this.

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