Trying to include "arm_math.h" functions definitions from CMSIS-DSP.

[savakazakov]

Hello,

As part of my TYP project I need to use an FFT implementation based on CMSIS-DSP's transformation functions.
link: https://github.com/ARM-software/CMSIS-DSP/tree/main/Source/TransformFunctions

Namely I need:

• arm_rfft_fast_init_f32
• arm_rfft_fast_f32
• arm_cmplx_mag_f32
• arm_max_f32

I saw that there is a "arm_math.h" header file in this path: "libraries/codal-nrf52/inc/cmsis/arm_math.h"

However there are no function definitions.

What I have tried so far:

1. Follow the instructions from the CMSIS-DSP repository described here: https://github.com/ARM-software/CMSIS-DSP#how-to-build-cmsis-dsp-with-cmake
2. Added the CMSIS_5 and CMSIS-DSP repos as submodules and try to alter the parent CMakeLists.txt
3. Adding separate source files to the sources/ directory.
4. Follow the steps in CMakeLists.txt from a private lancaster-university repository "codal-microbit-fft"
5. And various combinations of the above.

I would appreciate any suggestions and aid as I am very new to cmake and I'm not sure how the project is built in its entirety.
What I suppose I am really asking is: What is the procedure of adding library dependencies to the project?

[microbit-carlos]

Hopefully this will help:

• FFT example codal-microbit-v2#291