Hello, I use X-CUBE-MEMS1 in CubeIDE. I added MOTION_FX in my project (like my images) but when i call a function in MotionFx, i have error "undefined reference". Could you tell me how to fix it ? Thank you.

[KnarfB]

If you're using a Cortex-Mo M0+ MCU, use the functions from  motion_fx_cm0p.h, e.g. MotionFX_CM0P_initialize();

see "Getting started with MotionFX sensor fusion library in X-CUBE-MEMS1 expansion for STM32Cube" usr manual.

[M623]

I use STM32WB - CortexM4.

But i have the same problem with all the functions in motion_fx.h and motion_fx_cm0p.h.

My IDE can't find the reference to these functions

[Cartu38 OpenDev]

Works for me if STM32CubeIDE 1.5.1 & MEMS pack 8.2.0.

Please note .a file is used (archive file <=> precompiled code) ... I guess function implementation is part of.

 

[KnarfB]

Exactly. The last (linker) step in the build console should link that library (-l). Exact name depends on MPU core.

arm-none-eabi-gcc -o "MotionFX.elf" @"objects.list"  -l:MotionFX_CM0P_wc32_ot.a ...

If not, check that the library is in project properties:

[M623]

Thank you,

I added Library Paths like you but it cannot find the MotionFX_CM4F_wc32_ot.a

I don't know how to link to .a file

[KnarfB · Accepted solution]

[M623]

Thank you for all support,

Finally it works for me :beaming_face_with_smiling_eyes:

For information, with Cortex M4 we need to config the Floating point to work with MotionFx. More information here :

https://community.st.com/s/question/0D50X0000AkPUqYSQW/motionfx-library-arm-cortexm4f-hardware-floating-point