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jim_wei
jim_wei
Associate II
March 25, 2014
Question

Error: L6218E: Undefined symbol arm_fir_init_q15 (referred from low_pass_filter.o).

  • March 25, 2014
  • 2 replies
  • 976 views
Posted on March 25, 2014 at 06:58

I have a low pass filter function in my project which calls q15 fir filter.  The first statement in the filter function is &sharpinclude ''arm_math.h''.  When complie the project, I received following error:

.\Obj\transmitter.axf: Error: L6218E: Undefined symbol arm_fir_init_q15 (referred from low_pass_filter.o).

Since I have included ''arm_math.h'' which defines symbol arm_fir_init_q15, why the compiler says it is undefined?

Can anyone please help explain?

Thanks!

Jim

 

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    2 replies

    Amel NASRI
    Amel NASRI
    ST Technical Moderator
    March 25, 2014
    Posted on March 25, 2014 at 09:38

    You have to enable CMSIS usage in your IDE.

    The following discussions may help you:

    1-

    https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/CMSIS%20DSP%20library%20and%20FPU%20configuration

    2-

    https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/CMSIS%20DSP%20compilation%20error%20%20Struct%20Initialization

    -Mayla-

    To give better visibility on the answered topics, please click on "Best Answer" on the reply which solved your issue or answered your question.
    Tesla DeLorean
    Tesla DeLorean
    Guru
    July 20, 2017
    Posted on July 20, 2017 at 00:31

    Fixes for above dead links

    https://community.st.com/0D50X00009XkiVXSAZ

     

    https://community.st.com/0D50X00009XkYtZSAV

     
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    frankmeyer9
    frankmeyer9
    Associate III
    March 25, 2014
    Posted on March 25, 2014 at 10:47

    An you need to add the source file containing the implementation of arm_fir_init_q15 to your project. The headerfile just makes the names known, but (usually) doesn't add anything real.

    Or, alternatively, add the respective library to your project.

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