mirror of https://github.com/ArduPilot/ardupilot
261 lines
7.2 KiB
C++
261 lines
7.2 KiB
C++
#include <AP_HAL/AP_HAL.h>
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#include "AP_Compass.h"
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#include "AP_Compass_Backend.h"
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#include <AP_BattMonitor/AP_BattMonitor.h>
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extern const AP_HAL::HAL& hal;
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AP_Compass_Backend::AP_Compass_Backend()
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: _compass(AP::compass())
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{
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}
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void AP_Compass_Backend::rotate_field(Vector3f &mag, uint8_t instance)
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{
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Compass::mag_state &state = _compass._state[instance];
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mag.rotate(MAG_BOARD_ORIENTATION);
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mag.rotate(state.rotation);
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if (!state.external) {
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// and add in AHRS_ORIENTATION setting if not an external compass
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if (_compass._board_orientation == ROTATION_CUSTOM && _compass._custom_rotation) {
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mag = *_compass._custom_rotation * mag;
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} else {
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mag.rotate(_compass._board_orientation);
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}
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} else {
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// add user selectable orientation
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mag.rotate((enum Rotation)state.orientation.get());
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}
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}
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void AP_Compass_Backend::publish_raw_field(const Vector3f &mag, uint8_t instance)
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{
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Compass::mag_state &state = _compass._state[instance];
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// note that we do not set last_update_usec here as otherwise the
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// EKF and DCM would end up consuming compass data at the full
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// sensor rate. We want them to consume only the filtered fields
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state.last_update_ms = AP_HAL::millis();
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_compass._calibrator[instance].new_sample(mag);
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}
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void AP_Compass_Backend::correct_field(Vector3f &mag, uint8_t i)
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{
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Compass::mag_state &state = _compass._state[i];
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if (state.diagonals.get().is_zero()) {
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state.diagonals.set(Vector3f(1.0f,1.0f,1.0f));
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}
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const Vector3f &offsets = state.offset.get();
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const Vector3f &diagonals = state.diagonals.get();
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const Vector3f &offdiagonals = state.offdiagonals.get();
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const Vector3f &mot = state.motor_compensation.get();
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// add in the basic offsets
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mag += offsets;
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// apply eliptical correction
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Matrix3f mat(
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diagonals.x, offdiagonals.x, offdiagonals.y,
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offdiagonals.x, diagonals.y, offdiagonals.z,
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offdiagonals.y, offdiagonals.z, diagonals.z
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);
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mag = mat * mag;
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/*
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calculate motor-power based compensation
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note that _motor_offset[] is kept even if compensation is not
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being applied so it can be logged correctly
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*/
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state.motor_offset.zero();
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if (_compass._per_motor.enabled() && i == 0) {
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// per-motor correction is only valid for first compass
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_compass._per_motor.compensate(state.motor_offset);
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} else if (_compass._motor_comp_type == AP_COMPASS_MOT_COMP_THROTTLE) {
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state.motor_offset = mot * _compass._thr;
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} else if (_compass._motor_comp_type == AP_COMPASS_MOT_COMP_CURRENT) {
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AP_BattMonitor &battery = AP::battery();
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float current;
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if (battery.current_amps(current)) {
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state.motor_offset = mot * current;
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}
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}
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/*
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we apply the motor offsets after we apply the eliptical
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correction. This is needed to match the way that the motor
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compensation values are calculated, as they are calculated based
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on final field outputs, not on the raw outputs
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*/
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mag += state.motor_offset;
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}
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void AP_Compass_Backend::accumulate_sample(Vector3f &field, uint8_t instance,
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uint32_t max_samples)
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{
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/* rotate raw_field from sensor frame to body frame */
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rotate_field(field, instance);
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/* publish raw_field (uncorrected point sample) for calibration use */
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publish_raw_field(field, instance);
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/* correct raw_field for known errors */
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correct_field(field, instance);
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if (!field_ok(field)) {
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return;
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}
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WITH_SEMAPHORE(_sem);
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Compass::mag_state &state = _compass._state[instance];
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state.accum += field;
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state.accum_count++;
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if (max_samples && state.accum_count >= max_samples) {
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state.accum_count /= 2;
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state.accum /= 2;
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}
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}
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void AP_Compass_Backend::drain_accumulated_samples(uint8_t instance,
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const Vector3f *scaling)
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{
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WITH_SEMAPHORE(_sem);
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Compass::mag_state &state = _compass._state[instance];
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if (state.accum_count == 0) {
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return;
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}
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if (scaling) {
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state.accum *= *scaling;
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}
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state.accum /= state.accum_count;
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publish_filtered_field(state.accum, instance);
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state.accum.zero();
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state.accum_count = 0;
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}
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/*
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copy latest data to the frontend from a backend
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*/
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void AP_Compass_Backend::publish_filtered_field(const Vector3f &mag, uint8_t instance)
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{
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Compass::mag_state &state = _compass._state[instance];
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state.field = mag;
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state.last_update_ms = AP_HAL::millis();
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state.last_update_usec = AP_HAL::micros();
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}
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void AP_Compass_Backend::set_last_update_usec(uint32_t last_update, uint8_t instance)
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{
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Compass::mag_state &state = _compass._state[instance];
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state.last_update_usec = last_update;
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}
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/*
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register a new backend with frontend, returning instance which
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should be used in publish_field()
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*/
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uint8_t AP_Compass_Backend::register_compass(void) const
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{
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return _compass.register_compass();
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}
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/*
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set dev_id for an instance
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*/
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void AP_Compass_Backend::set_dev_id(uint8_t instance, uint32_t dev_id)
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{
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_compass._state[instance].dev_id.set_and_notify(dev_id);
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_compass._state[instance].detected_dev_id = dev_id;
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}
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/*
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save dev_id, used by SITL
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*/
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void AP_Compass_Backend::save_dev_id(uint8_t instance)
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{
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_compass._state[instance].dev_id.save();
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}
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/*
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set external for an instance
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*/
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void AP_Compass_Backend::set_external(uint8_t instance, bool external)
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{
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if (_compass._state[instance].external != 2) {
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_compass._state[instance].external.set_and_notify(external);
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}
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}
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bool AP_Compass_Backend::is_external(uint8_t instance)
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{
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return _compass._state[instance].external;
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}
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// set rotation of an instance
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void AP_Compass_Backend::set_rotation(uint8_t instance, enum Rotation rotation)
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{
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_compass._state[instance].rotation = rotation;
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}
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static constexpr float FILTER_KOEF = 0.1f;
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/* Check that the compass value is valid by using a mean filter. If
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* the value is further than filtrer_range from mean value, it is
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* rejected.
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*/
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bool AP_Compass_Backend::field_ok(const Vector3f &field)
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{
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if (field.is_inf() || field.is_nan()) {
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return false;
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}
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const float range = (float)_compass.get_filter_range();
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if (range <= 0) {
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return true;
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}
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const float length = field.length();
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if (is_zero(_mean_field_length)) {
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_mean_field_length = length;
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return true;
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}
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bool ret = true;
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const float d = fabsf(_mean_field_length - length) / (_mean_field_length + length); // diff divide by mean value in percent ( with the *200.0f on later line)
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float koeff = FILTER_KOEF;
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if (d * 200.0f > range) { // check the difference from mean value outside allowed range
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// printf("\nCompass field length error: mean %f got %f\n", (double)_mean_field_length, (double)length );
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ret = false;
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koeff /= (d * 10.0f); // 2.5 and more, so one bad sample never change mean more than 4%
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_error_count++;
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}
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_mean_field_length = _mean_field_length * (1 - koeff) + length * koeff; // complimentary filter 1/k
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return ret;
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}
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enum Rotation AP_Compass_Backend::get_board_orientation(void) const
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{
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return _compass._board_orientation;
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}
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