filter.h

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/*
 * This file is part of Ninjaflight.
 *
 * Ninjaflight is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Ninjaflight is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Ninjaflight.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once 

typedef struct filterStatePt1_s {
    float state;
    float RC;
    float constdT;
} filterStatePt1_t;

/* this holds the data required to update samples thru a filter */
typedef struct biquad_s {
    float b0, b1, b2, a1, a2;
    float x1, x2, y1, y2;
} biquad_t;

float filterApplyPt1(float input, filterStatePt1_t *filter, uint8_t f_cut, float dt);
float applyBiQuadFilter(float sample, biquad_t *state);
void BiQuadNewLpf(float filterCutFreq, biquad_t *newState, uint32_t refreshRate);
int32_t filterApplyAverage(int32_t input, uint8_t count, int32_t averageState[]);
float filterApplyAveragef(float input, uint8_t count, float averageState[]);