Which header file must you include in your sources to access the library functions?
The library is released in source form. The functions are declared in arm_math.h, which resides in the Include folder of the repository.
The library is provides vectorized versions of most algorithms for Helium and of most f32 algorithms for Neon.
CMSIS-DSP is distributed in source form on Github and within the CMSIS-Core software pack. It is licensed under Apache License 2.0.