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/* Copyright 2015 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Online magnetometer calibration */
#ifndef __CROS_EC_MAG_CAL_H
#define __CROS_EC_MAG_CAL_H
#include "kasa.h"
#include "mat44.h"
#include "math_util.h"
#include "vec4.h"
#define MAG_CAL_MAX_SAMPLES 0xffff
#define MAG_CAL_MIN_BATCH_WINDOW_US (2 * SECOND)
#define MAG_CAL_MIN_BATCH_SIZE 50 /* samples */
struct mag_cal_t {
struct kasa_fit kasa_fit;
fp_t radius;
intv3_t bias;
/* number of samples needed to calibrate */
uint16_t batch_size;
};
void init_mag_cal(struct mag_cal_t *moc);
/**
* Update the magnetometer calibration structure and possibly compute the new
* bias.
*
* @param moc Pointer to the magnetometer struct to update.
* @param v The new data.
* @return 1 if a new calibration value is available, 0 otherwise.
*/
int mag_cal_update(struct mag_cal_t *moc, const intv3_t v);
#endif /* __CROS_EC_MAG_CAL_H */
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