filter.h

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#pragma once
#include <stdint.h>
#include <stdbool.h>
 
typedef struct core_filter_s {
    float *coeffX;          // Pointer to coefficient array for inputs. Stored most recent last
    float *coeffY;          // Pointer to coefficient array for outputs. Stored most recent last
    float *prevX;           // Pointer to circular buffer holding previous inputs
    float *prevY;           // Pointer to circular buffer holding previous outputs
    float val;              // Previous saved output
    uint8_t posX;           // Current position in input circular buffer
    uint8_t posY;           // Current position in output circular buffer
    uint8_t orderX;         // How many previous X values to store
    uint8_t orderY;         // How many previous Y values to store
} core_filter_t;
 
float core_filter_update(float x, core_filter_t *filt);
 
bool core_filter_rolling_avg_init(uint8_t order, core_filter_t *filt);
 
bool core_filter_exp_lowpass_init(float a, core_filter_t *filt);