CMSIS_IIRfilt.c

// CMSIS Math
#include "arm_math.h"
#include "arm_const_structs.h"
#define SIG_SAMPLES 1024
#define BLOCK_SIZE 32;

#include "SWAsignal.h"
static float32_t filtSignal[SIG_SAMPLES];

// FILTER
#define IIR_ORDER 4
#define IIR_NUMSTAGES (IIR_ORDER / 2)
static float32_t m_biquad_state[IIR_ORDER];
static float32_t m_biquad_coeffs[5 * IIR_NUMSTAGES] = { 1.0000000000f,
		-1.9169186492f, 1.0000000000f, 1.9314191302f, -0.9338812219f,
		1.0000000000f, -1.9829505952f, 1.0000000000f, 1.9737574359f,
		-0.9797267211f };
arm_biquad_cascade_df2T_instance_f32 const filtInst = {
  IIR_ORDER / 2, m_biquad_state, m_biquad_coeffs };
static uint32_t filtBlockSize = BLOCK_SIZE;
static uint32_t filtNumBlocks = SIG_SAMPLES / BLOCK_SIZE;

void main() {
  float32_t *inputF32, *outputF32;
  uint32_t i;
	inputF32 = &inputSignal[0];
	outputF32 = &filtSignal[0];
  
  for (i = 0; i < filtNumBlocks; i++) {
			arm_biquad_cascade_df2T_f32(&filtInst,
					inputF32 + (i * filtBlockSize),
					outputF32 + (i * filtBlockSize), filtBlockSize);
		}
}