LibrePilot/flight/libraries/auxmagsupport.c

/**
 ******************************************************************************
 *
 * @file       auxmagsupport.c
 * @author     The LibrePilot Project, http://www.librepilot.org Copyright (C) 2015-2016.
 *             The OpenPilot Team, http://www.openpilot.org Copyright (C) 2014.
 * @brief      Functions to handle aux mag data and calibration.
 *             --
 * @see        The GNU Public License (GPL) Version 3
 *
 *****************************************************************************/
/*
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <stdint.h>
#include "inc/auxmagsupport.h"
#include "CoordinateConversions.h"

static float mag_bias[3] = { 0, 0, 0 };
static float mag_transform[3][3] = {
    { 1, 0, 0 }, { 0, 1, 0 }, { 0, 0, 1 }
};

AuxMagSettingsTypeOptions option;

void auxmagsupport_reload_settings()
{
    AuxMagSettingsData cal;
    float magQuat[4];
    float R[3][3];

    AuxMagSettingsGet(&cal);
    mag_bias[0] = cal.mag_bias.X;
    mag_bias[1] = cal.mag_bias.Y;
    mag_bias[2] = cal.mag_bias.Z;

    // convert the RPY mag board rotation to into a rotation matrix
    // rotate the vector into the level hover frame (the attitude frame)
    const float magRpy[3] = { cal.BoardRotation.Roll, cal.BoardRotation.Pitch, cal.BoardRotation.Yaw };
    RPY2Quaternion(magRpy, magQuat);
    Quaternion2R(magQuat, R);

    // the mag transform only scales the raw mag values
    matrix_mult_3x3f((float(*)[3])AuxMagSettingsmag_transformToArray(cal.mag_transform), R, mag_transform);

    // GPSV9, Ext (unused), and Flexi
    AuxMagSettingsTypeGet(&option);

    const uint8_t status = AUXMAGSENSOR_STATUS_NONE;
    // next sample from other external mags will provide the right status if present
    AuxMagSensorStatusSet((uint8_t *)&status);
}

void auxmagsupport_publish_samples(float mags[3], uint8_t status)
{
    float mag_out[3];

    mags[0] -= mag_bias[0];
    mags[1] -= mag_bias[1];
    mags[2] -= mag_bias[2];
    rot_mult(mag_transform, mags, mag_out);

    AuxMagSensorData data;
    data.x = mag_out[0];
    data.y = mag_out[1];
    data.z = mag_out[2];
    data.Status = status;
    AuxMagSensorSet(&data);
}

AuxMagSettingsTypeOptions auxmagsupport_get_type()
{
    return option;
}