filter.h

#ifndef filter_INCLUDED
#define filter_INCLUDED


#include <stdlib.h>
#include <string.h>

#define _USE_MATH_DEFINES
#include <math.h>




struct filter_settings{
                       double old_input;
                       double old_output;
                       double factor;
                       double sample_frequency;
                       double cutoff_frequency;
                       int    is_LPF;
                       int first_sample;
                      };



struct filter_settings * create_filter(int, double, double);
void reset_filter(int, struct filter_settings *);
int first_order_filter(int, struct filter_settings *);
double get_filter_factor(double, double);
struct filter_settings * create_filter_copy(struct filter_settings *);



#endif