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/****************************************************************************
*
* Copyright (C) 2013 PX4 Development Team. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/**
* @file mag_calibration.cpp
* Magnetometer calibration routine
*/
#include "mag_calibration.h"
#include "commander_helper.h"
#include "calibration_routines.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <poll.h>
#include <math.h>
#include <fcntl.h>
#include <drivers/drv_hrt.h>
#include <uORB/topics/sensor_combined.h>
#include <drivers/drv_mag.h>
#include <mavlink/mavlink_log.h>
#include <systemlib/param/param.h>
#include <systemlib/err.h>
/* oddly, ERROR is not defined for c++ */
#ifdef ERROR
# undef ERROR
#endif
static const int ERROR = -1;
int do_mag_calibration(int mavlink_fd)
{
mavlink_log_info(mavlink_fd, "please put the system in a rest position and wait.");
int sub_mag = orb_subscribe(ORB_ID(sensor_mag));
struct mag_report mag;
/* 45 seconds */
uint64_t calibration_interval = 45 * 1000 * 1000;
/* maximum 2000 values */
const unsigned int calibration_maxcount = 500;
unsigned int calibration_counter = 0;
/* limit update rate to get equally spaced measurements over time (in ms) */
orb_set_interval(sub_mag, (calibration_interval / 1000) / calibration_maxcount);
int fd = open(MAG_DEVICE_PATH, O_RDONLY);
/* erase old calibration */
struct mag_scale mscale_null = {
0.0f,
1.0f,
0.0f,
1.0f,
0.0f,
1.0f,
};
if (OK != ioctl(fd, MAGIOCSSCALE, (long unsigned int)&mscale_null)) {
warn("WARNING: failed to set scale / offsets for mag");
mavlink_log_info(mavlink_fd, "failed to set scale / offsets for mag");
}
/* calibrate range */
if (OK != ioctl(fd, MAGIOCCALIBRATE, fd)) {
warnx("failed to calibrate scale");
}
close(fd);
mavlink_log_info(mavlink_fd, "mag cal progress <20> percent");
/* calibrate offsets */
// uint64_t calibration_start = hrt_absolute_time();
uint64_t axis_deadline = hrt_absolute_time();
uint64_t calibration_deadline = hrt_absolute_time() + calibration_interval;
const char axislabels[3] = { 'X', 'Y', 'Z'};
int axis_index = -1;
float *x = (float *)malloc(sizeof(float) * calibration_maxcount);
float *y = (float *)malloc(sizeof(float) * calibration_maxcount);
float *z = (float *)malloc(sizeof(float) * calibration_maxcount);
if (x == NULL || y == NULL || z == NULL) {
warnx("mag cal failed: out of memory");
mavlink_log_info(mavlink_fd, "mag cal failed: out of memory");
warnx("x:%p y:%p z:%p\n", x, y, z);
return ERROR;
}
mavlink_log_info(mavlink_fd, "scale calibration completed, dynamic calibration starting..");
unsigned poll_errcount = 0;
while (hrt_absolute_time() < calibration_deadline &&
calibration_counter < calibration_maxcount) {
/* wait blocking for new data */
struct pollfd fds[1];
fds[0].fd = sub_mag;
fds[0].events = POLLIN;
/* user guidance */
if (hrt_absolute_time() >= axis_deadline &&
axis_index < 3) {
axis_index++;
mavlink_log_info(mavlink_fd, "please rotate in a figure 8 or around %c axis.", axislabels[axis_index]);
mavlink_log_info(mavlink_fd, "mag cal progress <%u> percent", 20 + (calibration_maxcount * 50) / calibration_counter);
tune_neutral();
axis_deadline += calibration_interval / 3;
}
if (!(axis_index < 3)) {
break;
}
// int axis_left = (int64_t)axis_deadline - (int64_t)hrt_absolute_time();
// if ((axis_left / 1000) == 0 && axis_left > 0) {
// char buf[50];
// sprintf(buf, "[cmd] %d seconds left for axis %c", axis_left, axislabels[axis_index]);
// mavlink_log_info(mavlink_fd, buf);
// }
int poll_ret = poll(fds, 1, 1000);
if (poll_ret > 0) {
orb_copy(ORB_ID(sensor_mag), sub_mag, &mag);
x[calibration_counter] = mag.x;
y[calibration_counter] = mag.y;
z[calibration_counter] = mag.z;
/* get min/max values */
// if (mag.x < mag_min[0]) {
// mag_min[0] = mag.x;
// }
// else if (mag.x > mag_max[0]) {
// mag_max[0] = mag.x;
// }
// if (raw.magnetometer_ga[1] < mag_min[1]) {
// mag_min[1] = raw.magnetometer_ga[1];
// }
// else if (raw.magnetometer_ga[1] > mag_max[1]) {
// mag_max[1] = raw.magnetometer_ga[1];
// }
// if (raw.magnetometer_ga[2] < mag_min[2]) {
// mag_min[2] = raw.magnetometer_ga[2];
// }
// else if (raw.magnetometer_ga[2] > mag_max[2]) {
// mag_max[2] = raw.magnetometer_ga[2];
// }
calibration_counter++;
} else {
poll_errcount++;
}
if (poll_errcount > 1000) {
mavlink_log_info(mavlink_fd, "ERROR: Failed reading mag sensor");
return ERROR;
}
}
float sphere_x;
float sphere_y;
float sphere_z;
float sphere_radius;
sphere_fit_least_squares(x, y, z, calibration_counter, 100, 0.0f, &sphere_x, &sphere_y, &sphere_z, &sphere_radius);
free(x);
free(y);
free(z);
if (isfinite(sphere_x) && isfinite(sphere_y) && isfinite(sphere_z)) {
fd = open(MAG_DEVICE_PATH, 0);
struct mag_scale mscale;
if (OK != ioctl(fd, MAGIOCGSCALE, (long unsigned int)&mscale))
warn("WARNING: failed to get scale / offsets for mag");
mscale.x_offset = sphere_x;
mscale.y_offset = sphere_y;
mscale.z_offset = sphere_z;
if (OK != ioctl(fd, MAGIOCSSCALE, (long unsigned int)&mscale))
warn("WARNING: failed to set scale / offsets for mag");
close(fd);
/* announce and set new offset */
if (param_set(param_find("SENS_MAG_XOFF"), &(mscale.x_offset))) {
warnx("Setting X mag offset failed!\n");
}
if (param_set(param_find("SENS_MAG_YOFF"), &(mscale.y_offset))) {
warnx("Setting Y mag offset failed!\n");
}
if (param_set(param_find("SENS_MAG_ZOFF"), &(mscale.z_offset))) {
warnx("Setting Z mag offset failed!\n");
}
if (param_set(param_find("SENS_MAG_XSCALE"), &(mscale.x_scale))) {
warnx("Setting X mag scale failed!\n");
}
if (param_set(param_find("SENS_MAG_YSCALE"), &(mscale.y_scale))) {
warnx("Setting Y mag scale failed!\n");
}
if (param_set(param_find("SENS_MAG_ZSCALE"), &(mscale.z_scale))) {
warnx("Setting Z mag scale failed!\n");
}
mavlink_log_info(mavlink_fd, "mag cal progress <90> percent");
/* auto-save to EEPROM */
int save_ret = param_save_default();
if (save_ret != 0) {
warn("WARNING: auto-save of params to storage failed");
mavlink_log_info(mavlink_fd, "FAILED storing calibration");
return ERROR;
}
warnx("\tscale: %.6f %.6f %.6f\n \toffset: %.6f %.6f %.6f\nradius: %.6f GA\n",
(double)mscale.x_scale, (double)mscale.y_scale, (double)mscale.z_scale,
(double)mscale.x_offset, (double)mscale.y_offset, (double)mscale.z_offset, (double)sphere_radius);
char buf[52];
sprintf(buf, "mag off: x:%.2f y:%.2f z:%.2f Ga", (double)mscale.x_offset,
(double)mscale.y_offset, (double)mscale.z_offset);
mavlink_log_info(mavlink_fd, buf);
sprintf(buf, "mag scale: x:%.2f y:%.2f z:%.2f", (double)mscale.x_scale,
(double)mscale.y_scale, (double)mscale.z_scale);
mavlink_log_info(mavlink_fd, buf);
mavlink_log_info(mavlink_fd, "magnetometer calibration completed");
mavlink_log_info(mavlink_fd, "mag cal progress <100> percent");
return OK;
/* third beep by cal end routine */
} else {
mavlink_log_info(mavlink_fd, "mag calibration FAILED (NaN in sphere fit)");
return ERROR;
}
}
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