magConsistencyCheck.cpp
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/****************************************************************************
*
* Copyright (c) 2019 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.
*
****************************************************************************/
#include "../PreFlightCheck.hpp"
#include <HealthFlags.h>
#include <lib/parameters/param.h>
#include <mathlib/mathlib.h>
#include <systemlib/mavlink_log.h>
#include <uORB/Subscription.hpp>
#include <uORB/topics/sensor_preflight_mag.h>
// return false if the magnetomer measurements are inconsistent
bool PreFlightCheck::magConsistencyCheck(orb_advert_t *mavlink_log_pub, vehicle_status_s &status,
const bool report_status)
{
bool pass = false; // flag for result of checks
// get the sensor preflight data
uORB::SubscriptionData<sensor_preflight_mag_s> sensors_sub{ORB_ID(sensor_preflight_mag)};
sensors_sub.update();
const sensor_preflight_mag_s &sensors = sensors_sub.get();
if (sensors.timestamp == 0) {
// can happen if not advertised (yet)
pass = true;
}
// Use the difference between sensors to detect a bad calibration, orientation or magnetic interference.
// If a single sensor is fitted, the value being checked will be zero so this check will always pass.
int32_t angle_difference_limit_deg = 90;
param_get(param_find("COM_ARM_MAG_ANG"), &angle_difference_limit_deg);
pass = pass || angle_difference_limit_deg < 0; // disabled, pass check
pass = pass || sensors.mag_inconsistency_angle < math::radians<float>(angle_difference_limit_deg);
if (!pass && report_status) {
mavlink_log_critical(mavlink_log_pub, "Preflight Fail: Compasses %d° inconsistent",
static_cast<int>(math::degrees<float>(sensors.mag_inconsistency_angle)));
mavlink_log_critical(mavlink_log_pub, "Please check orientations and recalibrate");
set_health_flags_healthy(subsystem_info_s::SUBSYSTEM_TYPE_MAG, false, status);
set_health_flags_healthy(subsystem_info_s::SUBSYSTEM_TYPE_MAG2, false, status);
}
return pass;
}