Good insight! I guess I don't really understand why we can't use native types then. I don't want to keep having to write these:

  pub fn fir_q31(
    s: &mut sys::arm_fir_instance_q31,
    input: &[i32],
    output: &mut [i32],
    block_size: usize,

) { // void arm_fir_q31 ( // const arm_fir_instance_q31 * S, // const float32_t * pSrc, // float32_t * pDst, // uint32_t blockSize // ) // Parameters // [in] S points to an instance of the floating-point FIR filter structure // [in] pSrc points to the block of input data // [out] pDst points to the block of output data // [in] blockSize number of samples to process // Returns none

    compiler_fence(Ordering::SeqCst);
    unsafe {
        sys::arm_fir_q31(s, input.as_ptr(), output.as_mut_ptr(), block_size as u32);
    }
}