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mc_att_control_main.cpp
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mc_att_control_main.cpp
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/****************************************************************************
*
* Copyright (c) 2013-2017 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 mc_att_control_main.cpp
* Multicopter attitude controller.
*
* Publication for the desired attitude tracking:
* Daniel Mellinger and Vijay Kumar. Minimum Snap Trajectory Generation and Control for Quadrotors.
* Int. Conf. on Robotics and Automation, Shanghai, China, May 2011.
*
* @author Lorenz Meier <lorenz@px4.io>
* @author Anton Babushkin <anton.babushkin@me.com>
* @author Sander Smeets <sander@droneslab.com>
*
* The controller has two loops: P loop for angular error and PD loop for angular rate error.
* Desired rotation calculated keeping in mind that yaw response is normally slower than roll/pitch.
* For small deviations controller rotates copter to have shortest path of thrust vector and independently rotates around yaw,
* so actual rotation axis is not constant. For large deviations controller rotates copter around fixed axis.
* These two approaches fused seamlessly with weight depending on angular error.
* When thrust vector directed near-horizontally (e.g. roll ~= PI/2) yaw setpoint ignored because of singularity.
* Controller doesn't use Euler angles for work, they generated only for more human-friendly control and logging.
* If rotation matrix setpoint is invalid it will be generated from Euler angles for compatibility with old position controllers.
*/
#include <px4_config.h>
#include <px4_defines.h>
#include <px4_tasks.h>
#include <px4_posix.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <math.h>
#include <poll.h>
#include <drivers/drv_hrt.h>
#include <arch/board/board.h>
#include <uORB/uORB.h>
#include <uORB/topics/vehicle_attitude_setpoint.h>
#include <uORB/topics/manual_control_setpoint.h>
#include <uORB/topics/actuator_controls.h>
#include <uORB/topics/vehicle_rates_setpoint.h>
#include <uORB/topics/fw_virtual_rates_setpoint.h>
#include <uORB/topics/mc_virtual_rates_setpoint.h>
#include <uORB/topics/control_state.h>
#include <uORB/topics/vehicle_control_mode.h>
#include <uORB/topics/vehicle_status.h>
#include <uORB/topics/actuator_armed.h>
#include <uORB/topics/parameter_update.h>
#include <uORB/topics/multirotor_motor_limits.h>
#include <uORB/topics/mc_att_ctrl_status.h>
#include <uORB/topics/battery_status.h>
#include <uORB/topics/sensor_gyro.h>
#include <uORB/topics/sensor_correction.h>
#include <systemlib/param/param.h>
#include <systemlib/err.h>
#include <systemlib/perf_counter.h>
#include <systemlib/systemlib.h>
#include <systemlib/circuit_breaker.h>
#include <lib/mathlib/mathlib.h>
#include <lib/geo/geo.h>
#include <lib/tailsitter_recovery/tailsitter_recovery.h>
#include <conversion/rotation.h>
/**
* Multicopter attitude control app start / stop handling function
*
* @ingroup apps
*/
extern "C" __EXPORT int mc_att_control_main(int argc, char *argv[]);
#define YAW_DEADZONE 0.05f
#define MIN_TAKEOFF_THRUST 0.2f
#define TPA_RATE_LOWER_LIMIT 0.05f
#define MANUAL_THROTTLE_MAX_MULTICOPTER 0.9f
#define ATTITUDE_TC_DEFAULT 0.2f
#define AXIS_INDEX_ROLL 0
#define AXIS_INDEX_PITCH 1
#define AXIS_INDEX_YAW 2
#define AXIS_COUNT 3
#define MAX_GYRO_COUNT 3
class MulticopterAttitudeControl
{
public:
/**
* Constructor
*/
MulticopterAttitudeControl();
/**
* Destructor, also kills the main task
*/
~MulticopterAttitudeControl();
/**
* Start the multicopter attitude control task.
*
* @return OK on success.
*/
int start();
private:
bool _task_should_exit; /**< if true, task_main() should exit */
int _control_task; /**< task handle */
int _ctrl_state_sub; /**< control state subscription */
int _v_att_sp_sub; /**< vehicle attitude setpoint subscription */
int _v_rates_sp_sub; /**< vehicle rates setpoint subscription */
int _v_control_mode_sub; /**< vehicle control mode subscription */
int _params_sub; /**< parameter updates subscription */
int _manual_control_sp_sub; /**< manual control setpoint subscription */
int _armed_sub; /**< arming status subscription */
int _vehicle_status_sub; /**< vehicle status subscription */
int _motor_limits_sub; /**< motor limits subscription */
int _battery_status_sub; /**< battery status subscription */
int _sensor_gyro_sub[MAX_GYRO_COUNT]; /**< gyro data subscription */
int _sensor_correction_sub; /**< sensor thermal correction subscription */
unsigned _gyro_count;
int _selected_gyro;
orb_advert_t _v_rates_sp_pub; /**< rate setpoint publication */
orb_advert_t _actuators_0_pub; /**< attitude actuator controls publication */
orb_advert_t _controller_status_pub; /**< controller status publication */
orb_id_t _rates_sp_id; /**< pointer to correct rates setpoint uORB metadata structure */
orb_id_t _actuators_id; /**< pointer to correct actuator controls0 uORB metadata structure */
bool _actuators_0_circuit_breaker_enabled; /**< circuit breaker to suppress output */
struct control_state_s _ctrl_state; /**< control state */
struct vehicle_attitude_setpoint_s _v_att_sp; /**< vehicle attitude setpoint */
struct vehicle_rates_setpoint_s _v_rates_sp; /**< vehicle rates setpoint */
struct manual_control_setpoint_s _manual_control_sp; /**< manual control setpoint */
struct vehicle_control_mode_s _v_control_mode; /**< vehicle control mode */
struct actuator_controls_s _actuators; /**< actuator controls */
struct actuator_armed_s _armed; /**< actuator arming status */
struct vehicle_status_s _vehicle_status; /**< vehicle status */
struct multirotor_motor_limits_s _motor_limits; /**< motor limits */
struct mc_att_ctrl_status_s _controller_status; /**< controller status */
struct battery_status_s _battery_status; /**< battery status */
struct sensor_gyro_s _sensor_gyro; /**< gyro data before thermal correctons and ekf bias estimates are applied */
struct sensor_correction_s _sensor_correction; /**< sensor thermal corrections */
union {
struct {
uint16_t motor_pos : 1; // 0 - true when any motor has saturated in the positive direction
uint16_t motor_neg : 1; // 1 - true when any motor has saturated in the negative direction
uint16_t roll_pos : 1; // 2 - true when a positive roll demand change will increase saturation
uint16_t roll_neg : 1; // 3 - true when a negative roll demand change will increase saturation
uint16_t pitch_pos : 1; // 4 - true when a positive pitch demand change will increase saturation
uint16_t pitch_neg : 1; // 5 - true when a negative pitch demand change will increase saturation
uint16_t yaw_pos : 1; // 6 - true when a positive yaw demand change will increase saturation
uint16_t yaw_neg : 1; // 7 - true when a negative yaw demand change will increase saturation
uint16_t thrust_pos : 1; // 8 - true when a positive thrust demand change will increase saturation
uint16_t thrust_neg : 1; // 9 - true when a negative thrust demand change will increase saturation
} flags;
uint16_t value;
} _saturation_status;
perf_counter_t _loop_perf; /**< loop performance counter */
perf_counter_t _controller_latency_perf;
math::Vector<3> _rates_prev; /**< angular rates on previous step */
math::Vector<3> _rates_sp_prev; /**< previous rates setpoint */
math::Vector<3> _rates_sp; /**< angular rates setpoint */
math::Vector<3> _rates_int; /**< angular rates integral error */
float _thrust_sp; /**< thrust setpoint */
math::Vector<3> _att_control; /**< attitude control vector */
math::Matrix<3, 3> _I; /**< identity matrix */
math::Matrix<3, 3> _board_rotation = {}; /**< rotation matrix for the orientation that the board is mounted */
struct {
param_t roll_p;
param_t roll_rate_p;
param_t roll_rate_i;
param_t roll_rate_integ_lim;
param_t roll_rate_d;
param_t roll_rate_ff;
param_t pitch_p;
param_t pitch_rate_p;
param_t pitch_rate_i;
param_t pitch_rate_integ_lim;
param_t pitch_rate_d;
param_t pitch_rate_ff;
param_t tpa_breakpoint_p;
param_t tpa_breakpoint_i;
param_t tpa_breakpoint_d;
param_t tpa_rate_p;
param_t tpa_rate_i;
param_t tpa_rate_d;
param_t yaw_p;
param_t yaw_rate_p;
param_t yaw_rate_i;
param_t yaw_rate_integ_lim;
param_t yaw_rate_d;
param_t yaw_rate_ff;
param_t yaw_ff;
param_t roll_rate_max;
param_t pitch_rate_max;
param_t yaw_rate_max;
param_t yaw_auto_max;
param_t acro_roll_max;
param_t acro_pitch_max;
param_t acro_yaw_max;
param_t rattitude_thres;
param_t vtol_type;
param_t roll_tc;
param_t pitch_tc;
param_t vtol_opt_recovery_enabled;
param_t vtol_wv_yaw_rate_scale;
param_t bat_scale_en;
param_t board_rotation;
param_t board_offset[3];
} _params_handles; /**< handles for interesting parameters */
struct {
math::Vector<3> att_p; /**< P gain for angular error */
math::Vector<3> rate_p; /**< P gain for angular rate error */
math::Vector<3> rate_i; /**< I gain for angular rate error */
math::Vector<3> rate_int_lim; /**< integrator state limit for rate loop */
math::Vector<3> rate_d; /**< D gain for angular rate error */
math::Vector<3> rate_ff; /**< Feedforward gain for desired rates */
float yaw_ff; /**< yaw control feed-forward */
float tpa_breakpoint_p; /**< Throttle PID Attenuation breakpoint */
float tpa_breakpoint_i; /**< Throttle PID Attenuation breakpoint */
float tpa_breakpoint_d; /**< Throttle PID Attenuation breakpoint */
float tpa_rate_p; /**< Throttle PID Attenuation slope */
float tpa_rate_i; /**< Throttle PID Attenuation slope */
float tpa_rate_d; /**< Throttle PID Attenuation slope */
float roll_rate_max;
float pitch_rate_max;
float yaw_rate_max;
float yaw_auto_max;
math::Vector<3> mc_rate_max; /**< attitude rate limits in stabilized modes */
math::Vector<3> auto_rate_max; /**< attitude rate limits in auto modes */
math::Vector<3> acro_rate_max; /**< max attitude rates in acro mode */
float rattitude_thres;
int vtol_type; /**< 0 = Tailsitter, 1 = Tiltrotor, 2 = Standard airframe */
bool vtol_opt_recovery_enabled;
float vtol_wv_yaw_rate_scale; /**< Scale value [0, 1] for yaw rate setpoint */
int bat_scale_en;
int board_rotation;
float board_offset[3];
} _params;
TailsitterRecovery *_ts_opt_recovery; /**< Computes optimal rates for tailsitter recovery */
/**
* Update our local parameter cache.
*/
int parameters_update();
/**
* Check for parameter update and handle it.
*/
void parameter_update_poll();
/**
* Check for changes in vehicle control mode.
*/
void vehicle_control_mode_poll();
/**
* Check for changes in manual inputs.
*/
void vehicle_manual_poll();
/**
* Check for attitude setpoint updates.
*/
void vehicle_attitude_setpoint_poll();
/**
* Check for rates setpoint updates.
*/
void vehicle_rates_setpoint_poll();
/**
* Check for arming status updates.
*/
void arming_status_poll();
/**
* Attitude controller.
*/
void control_attitude(float dt);
/**
* Attitude rates controller.
*/
void control_attitude_rates(float dt);
/**
* Throttle PID attenuation.
*/
math::Vector<3> pid_attenuations(float tpa_breakpoint, float tpa_rate);
/**
* Check for vehicle status updates.
*/
void vehicle_status_poll();
/**
* Check for vehicle motor limits status.
*/
void vehicle_motor_limits_poll();
/**
* Check for battery status updates.
*/
void battery_status_poll();
/**
* Check for control state updates.
*/
void control_state_poll();
/**
* Check for sensor thermal correction updates.
*/
void sensor_correction_poll();
/**
* Shim for calling task_main from task_create.
*/
static void task_main_trampoline(int argc, char *argv[]);
/**
* Main attitude control task.
*/
void task_main();
};
namespace mc_att_control
{
MulticopterAttitudeControl *g_control;
}
MulticopterAttitudeControl::MulticopterAttitudeControl() :
_task_should_exit(false),
_control_task(-1),
/* subscriptions */
_ctrl_state_sub(-1),
_v_att_sp_sub(-1),
_v_control_mode_sub(-1),
_params_sub(-1),
_manual_control_sp_sub(-1),
_armed_sub(-1),
_vehicle_status_sub(-1),
_motor_limits_sub(-1),
_battery_status_sub(-1),
_sensor_correction_sub(-1),
/* gyro selection */
_gyro_count(1),
_selected_gyro(0),
/* publications */
_v_rates_sp_pub(nullptr),
_actuators_0_pub(nullptr),
_controller_status_pub(nullptr),
_rates_sp_id(nullptr),
_actuators_id(nullptr),
_actuators_0_circuit_breaker_enabled(false),
_ctrl_state{},
_v_att_sp{},
_v_rates_sp{},
_manual_control_sp{},
_v_control_mode{},
_actuators{},
_armed{},
_vehicle_status{},
_motor_limits{},
_controller_status{},
_battery_status{},
_sensor_gyro{},
_sensor_correction{},
_saturation_status{},
/* performance counters */
_loop_perf(perf_alloc(PC_ELAPSED, "mc_att_control")),
_controller_latency_perf(perf_alloc_once(PC_ELAPSED, "ctrl_latency")),
_ts_opt_recovery(nullptr)
{
for (uint8_t i = 0; i < MAX_GYRO_COUNT; i++) {
_sensor_gyro_sub[i] = -1;
}
_vehicle_status.is_rotary_wing = true;
_params.att_p.zero();
_params.rate_p.zero();
_params.rate_i.zero();
_params.rate_int_lim.zero();
_params.rate_d.zero();
_params.rate_ff.zero();
_params.yaw_ff = 0.0f;
_params.roll_rate_max = 0.0f;
_params.pitch_rate_max = 0.0f;
_params.yaw_rate_max = 0.0f;
_params.mc_rate_max.zero();
_params.auto_rate_max.zero();
_params.acro_rate_max.zero();
_params.rattitude_thres = 1.0f;
_params.vtol_opt_recovery_enabled = false;
_params.vtol_wv_yaw_rate_scale = 1.0f;
_params.bat_scale_en = 0;
_params.board_rotation = 0;
_params.board_offset[0] = 0.0f;
_params.board_offset[1] = 0.0f;
_params.board_offset[2] = 0.0f;
_rates_prev.zero();
_rates_sp.zero();
_rates_sp_prev.zero();
_rates_int.zero();
_thrust_sp = 0.0f;
_att_control.zero();
_I.identity();
_board_rotation.identity();
_params_handles.roll_p = param_find("MC_ROLL_P");
_params_handles.roll_rate_p = param_find("MC_ROLLRATE_P");
_params_handles.roll_rate_i = param_find("MC_ROLLRATE_I");
_params_handles.roll_rate_integ_lim = param_find("MC_RR_INT_LIM");
_params_handles.roll_rate_d = param_find("MC_ROLLRATE_D");
_params_handles.roll_rate_ff = param_find("MC_ROLLRATE_FF");
_params_handles.pitch_p = param_find("MC_PITCH_P");
_params_handles.pitch_rate_p = param_find("MC_PITCHRATE_P");
_params_handles.pitch_rate_i = param_find("MC_PITCHRATE_I");
_params_handles.pitch_rate_integ_lim = param_find("MC_PR_INT_LIM");
_params_handles.pitch_rate_d = param_find("MC_PITCHRATE_D");
_params_handles.pitch_rate_ff = param_find("MC_PITCHRATE_FF");
_params_handles.tpa_breakpoint_p = param_find("MC_TPA_BREAK_P");
_params_handles.tpa_breakpoint_i = param_find("MC_TPA_BREAK_I");
_params_handles.tpa_breakpoint_d = param_find("MC_TPA_BREAK_D");
_params_handles.tpa_rate_p = param_find("MC_TPA_RATE_P");
_params_handles.tpa_rate_i = param_find("MC_TPA_RATE_I");
_params_handles.tpa_rate_d = param_find("MC_TPA_RATE_D");
_params_handles.yaw_p = param_find("MC_YAW_P");
_params_handles.yaw_rate_p = param_find("MC_YAWRATE_P");
_params_handles.yaw_rate_i = param_find("MC_YAWRATE_I");
_params_handles.yaw_rate_integ_lim = param_find("MC_YR_INT_LIM");
_params_handles.yaw_rate_d = param_find("MC_YAWRATE_D");
_params_handles.yaw_rate_ff = param_find("MC_YAWRATE_FF");
_params_handles.yaw_ff = param_find("MC_YAW_FF");
_params_handles.roll_rate_max = param_find("MC_ROLLRATE_MAX");
_params_handles.pitch_rate_max = param_find("MC_PITCHRATE_MAX");
_params_handles.yaw_rate_max = param_find("MC_YAWRATE_MAX");
_params_handles.yaw_auto_max = param_find("MC_YAWRAUTO_MAX");
_params_handles.acro_roll_max = param_find("MC_ACRO_R_MAX");
_params_handles.acro_pitch_max = param_find("MC_ACRO_P_MAX");
_params_handles.acro_yaw_max = param_find("MC_ACRO_Y_MAX");
_params_handles.rattitude_thres = param_find("MC_RATT_TH");
_params_handles.vtol_type = param_find("VT_TYPE");
_params_handles.roll_tc = param_find("MC_ROLL_TC");
_params_handles.pitch_tc = param_find("MC_PITCH_TC");
_params_handles.vtol_opt_recovery_enabled = param_find("VT_OPT_RECOV_EN");
_params_handles.vtol_wv_yaw_rate_scale = param_find("VT_WV_YAWR_SCL");
_params_handles.bat_scale_en = param_find("MC_BAT_SCALE_EN");
/* rotations */
_params_handles.board_rotation = param_find("SENS_BOARD_ROT");
/* rotation offsets */
_params_handles.board_offset[0] = param_find("SENS_BOARD_X_OFF");
_params_handles.board_offset[1] = param_find("SENS_BOARD_Y_OFF");
_params_handles.board_offset[2] = param_find("SENS_BOARD_Z_OFF");
/* fetch initial parameter values */
parameters_update();
if (_params.vtol_type == 0 && _params.vtol_opt_recovery_enabled) {
// the vehicle is a tailsitter, use optimal recovery control strategy
_ts_opt_recovery = new TailsitterRecovery();
}
/* initialize thermal corrections as we might not immediately get a topic update (only non-zero values) */
for (unsigned i = 0; i < 3; i++) {
// used scale factors to unity
_sensor_correction.gyro_scale_0[i] = 1.0f;
_sensor_correction.gyro_scale_1[i] = 1.0f;
_sensor_correction.gyro_scale_2[i] = 1.0f;
}
}
MulticopterAttitudeControl::~MulticopterAttitudeControl()
{
if (_control_task != -1) {
/* task wakes up every 100ms or so at the longest */
_task_should_exit = true;
/* wait for a second for the task to quit at our request */
unsigned i = 0;
do {
/* wait 20ms */
usleep(20000);
/* if we have given up, kill it */
if (++i > 50) {
px4_task_delete(_control_task);
break;
}
} while (_control_task != -1);
}
if (_ts_opt_recovery != nullptr) {
delete _ts_opt_recovery;
}
mc_att_control::g_control = nullptr;
}
int
MulticopterAttitudeControl::parameters_update()
{
float v;
float roll_tc, pitch_tc;
param_get(_params_handles.roll_tc, &roll_tc);
param_get(_params_handles.pitch_tc, &pitch_tc);
/* roll gains */
param_get(_params_handles.roll_p, &v);
_params.att_p(0) = v * (ATTITUDE_TC_DEFAULT / roll_tc);
param_get(_params_handles.roll_rate_p, &v);
_params.rate_p(0) = v * (ATTITUDE_TC_DEFAULT / roll_tc);
param_get(_params_handles.roll_rate_i, &v);
_params.rate_i(0) = v;
param_get(_params_handles.roll_rate_integ_lim, &v);
_params.rate_int_lim(0) = v;
param_get(_params_handles.roll_rate_d, &v);
_params.rate_d(0) = v * (ATTITUDE_TC_DEFAULT / roll_tc);
param_get(_params_handles.roll_rate_ff, &v);
_params.rate_ff(0) = v;
/* pitch gains */
param_get(_params_handles.pitch_p, &v);
_params.att_p(1) = v * (ATTITUDE_TC_DEFAULT / pitch_tc);
param_get(_params_handles.pitch_rate_p, &v);
_params.rate_p(1) = v * (ATTITUDE_TC_DEFAULT / pitch_tc);
param_get(_params_handles.pitch_rate_i, &v);
_params.rate_i(1) = v;
param_get(_params_handles.pitch_rate_integ_lim, &v);
_params.rate_int_lim(1) = v;
param_get(_params_handles.pitch_rate_d, &v);
_params.rate_d(1) = v * (ATTITUDE_TC_DEFAULT / pitch_tc);
param_get(_params_handles.pitch_rate_ff, &v);
_params.rate_ff(1) = v;
param_get(_params_handles.tpa_breakpoint_p, &_params.tpa_breakpoint_p);
param_get(_params_handles.tpa_breakpoint_i, &_params.tpa_breakpoint_i);
param_get(_params_handles.tpa_breakpoint_d, &_params.tpa_breakpoint_d);
param_get(_params_handles.tpa_rate_p, &_params.tpa_rate_p);
param_get(_params_handles.tpa_rate_i, &_params.tpa_rate_i);
param_get(_params_handles.tpa_rate_d, &_params.tpa_rate_d);
/* yaw gains */
param_get(_params_handles.yaw_p, &v);
_params.att_p(2) = v;
param_get(_params_handles.yaw_rate_p, &v);
_params.rate_p(2) = v;
param_get(_params_handles.yaw_rate_i, &v);
_params.rate_i(2) = v;
param_get(_params_handles.yaw_rate_integ_lim, &v);
_params.rate_int_lim(2) = v;
param_get(_params_handles.yaw_rate_d, &v);
_params.rate_d(2) = v;
param_get(_params_handles.yaw_rate_ff, &v);
_params.rate_ff(2) = v;
param_get(_params_handles.yaw_ff, &_params.yaw_ff);
/* angular rate limits */
param_get(_params_handles.roll_rate_max, &_params.roll_rate_max);
_params.mc_rate_max(0) = math::radians(_params.roll_rate_max);
param_get(_params_handles.pitch_rate_max, &_params.pitch_rate_max);
_params.mc_rate_max(1) = math::radians(_params.pitch_rate_max);
param_get(_params_handles.yaw_rate_max, &_params.yaw_rate_max);
_params.mc_rate_max(2) = math::radians(_params.yaw_rate_max);
/* auto angular rate limits */
param_get(_params_handles.roll_rate_max, &_params.roll_rate_max);
_params.auto_rate_max(0) = math::radians(_params.roll_rate_max);
param_get(_params_handles.pitch_rate_max, &_params.pitch_rate_max);
_params.auto_rate_max(1) = math::radians(_params.pitch_rate_max);
param_get(_params_handles.yaw_auto_max, &_params.yaw_auto_max);
_params.auto_rate_max(2) = math::radians(_params.yaw_auto_max);
/* manual rate control scale and auto mode roll/pitch rate limits */
param_get(_params_handles.acro_roll_max, &v);
_params.acro_rate_max(0) = math::radians(v);
param_get(_params_handles.acro_pitch_max, &v);
_params.acro_rate_max(1) = math::radians(v);
param_get(_params_handles.acro_yaw_max, &v);
_params.acro_rate_max(2) = math::radians(v);
/* stick deflection needed in rattitude mode to control rates not angles */
param_get(_params_handles.rattitude_thres, &_params.rattitude_thres);
param_get(_params_handles.vtol_type, &_params.vtol_type);
int tmp;
param_get(_params_handles.vtol_opt_recovery_enabled, &tmp);
_params.vtol_opt_recovery_enabled = (bool)tmp;
param_get(_params_handles.vtol_wv_yaw_rate_scale, &_params.vtol_wv_yaw_rate_scale);
param_get(_params_handles.bat_scale_en, &_params.bat_scale_en);
_actuators_0_circuit_breaker_enabled = circuit_breaker_enabled("CBRK_RATE_CTRL", CBRK_RATE_CTRL_KEY);
/* rotation of the autopilot relative to the body */
param_get(_params_handles.board_rotation, &(_params.board_rotation));
/* fine adjustment of the rotation */
param_get(_params_handles.board_offset[0], &(_params.board_offset[0]));
param_get(_params_handles.board_offset[1], &(_params.board_offset[1]));
param_get(_params_handles.board_offset[2], &(_params.board_offset[2]));
return OK;
}
void
MulticopterAttitudeControl::parameter_update_poll()
{
bool updated;
/* Check if parameters have changed */
orb_check(_params_sub, &updated);
if (updated) {
struct parameter_update_s param_update;
orb_copy(ORB_ID(parameter_update), _params_sub, ¶m_update);
parameters_update();
}
}
void
MulticopterAttitudeControl::vehicle_control_mode_poll()
{
bool updated;
/* Check if vehicle control mode has changed */
orb_check(_v_control_mode_sub, &updated);
if (updated) {
orb_copy(ORB_ID(vehicle_control_mode), _v_control_mode_sub, &_v_control_mode);
}
}
void
MulticopterAttitudeControl::vehicle_manual_poll()
{
bool updated;
/* get pilots inputs */
orb_check(_manual_control_sp_sub, &updated);
if (updated) {
orb_copy(ORB_ID(manual_control_setpoint), _manual_control_sp_sub, &_manual_control_sp);
}
}
void
MulticopterAttitudeControl::vehicle_attitude_setpoint_poll()
{
/* check if there is a new setpoint */
bool updated;
orb_check(_v_att_sp_sub, &updated);
if (updated) {
orb_copy(ORB_ID(vehicle_attitude_setpoint), _v_att_sp_sub, &_v_att_sp);
}
}
void
MulticopterAttitudeControl::vehicle_rates_setpoint_poll()
{
/* check if there is a new setpoint */
bool updated;
orb_check(_v_rates_sp_sub, &updated);
if (updated) {
orb_copy(ORB_ID(vehicle_rates_setpoint), _v_rates_sp_sub, &_v_rates_sp);
}
}
void
MulticopterAttitudeControl::arming_status_poll()
{
/* check if there is a new setpoint */
bool updated;
orb_check(_armed_sub, &updated);
if (updated) {
orb_copy(ORB_ID(actuator_armed), _armed_sub, &_armed);
}
}
void
MulticopterAttitudeControl::vehicle_status_poll()
{
/* check if there is new status information */
bool vehicle_status_updated;
orb_check(_vehicle_status_sub, &vehicle_status_updated);
if (vehicle_status_updated) {
orb_copy(ORB_ID(vehicle_status), _vehicle_status_sub, &_vehicle_status);
/* set correct uORB ID, depending on if vehicle is VTOL or not */
if (!_rates_sp_id) {
if (_vehicle_status.is_vtol) {
_rates_sp_id = ORB_ID(mc_virtual_rates_setpoint);
_actuators_id = ORB_ID(actuator_controls_virtual_mc);
} else {
_rates_sp_id = ORB_ID(vehicle_rates_setpoint);
_actuators_id = ORB_ID(actuator_controls_0);
}
}
}
}
void
MulticopterAttitudeControl::vehicle_motor_limits_poll()
{
/* check if there is a new message */
bool updated;
orb_check(_motor_limits_sub, &updated);
if (updated) {
orb_copy(ORB_ID(multirotor_motor_limits), _motor_limits_sub, &_motor_limits);
_saturation_status.value = _motor_limits.saturation_status;
}
}
void
MulticopterAttitudeControl::battery_status_poll()
{
/* check if there is a new message */
bool updated;
orb_check(_battery_status_sub, &updated);
if (updated) {
orb_copy(ORB_ID(battery_status), _battery_status_sub, &_battery_status);
}
}
void
MulticopterAttitudeControl::control_state_poll()
{
/* check if there is a new message */
bool updated;
orb_check(_ctrl_state_sub, &updated);
if (updated) {
orb_copy(ORB_ID(control_state), _ctrl_state_sub, &_ctrl_state);
}
}
void
MulticopterAttitudeControl::sensor_correction_poll()
{
/* check if there is a new message */
bool updated;
orb_check(_sensor_correction_sub, &updated);
if (updated) {
orb_copy(ORB_ID(sensor_correction), _sensor_correction_sub, &_sensor_correction);
}
/* update the latest gyro selection */
if (_sensor_correction.selected_gyro_instance < sizeof(_sensor_gyro_sub) / sizeof(_sensor_gyro_sub[0])) {
_selected_gyro = _sensor_correction.selected_gyro_instance;
}
}
/**
* Attitude controller.
* Input: 'vehicle_attitude_setpoint' topics (depending on mode)
* Output: '_rates_sp' vector, '_thrust_sp'
*/
void
MulticopterAttitudeControl::control_attitude(float dt)
{
vehicle_attitude_setpoint_poll();
_thrust_sp = _v_att_sp.thrust;
/* construct attitude setpoint rotation matrix */
math::Quaternion q_sp(_v_att_sp.q_d[0], _v_att_sp.q_d[1], _v_att_sp.q_d[2], _v_att_sp.q_d[3]);
math::Matrix<3, 3> R_sp = q_sp.to_dcm();
/* get current rotation matrix from control state quaternions */
math::Quaternion q_att(_ctrl_state.q[0], _ctrl_state.q[1], _ctrl_state.q[2], _ctrl_state.q[3]);
math::Matrix<3, 3> R = q_att.to_dcm();
/* all input data is ready, run controller itself */
/* try to move thrust vector shortest way, because yaw response is slower than roll/pitch */
math::Vector<3> R_z(R(0, 2), R(1, 2), R(2, 2));
math::Vector<3> R_sp_z(R_sp(0, 2), R_sp(1, 2), R_sp(2, 2));
/* axis and sin(angle) of desired rotation */
math::Vector<3> e_R = R.transposed() * (R_z % R_sp_z);
/* calculate angle error */
float e_R_z_sin = e_R.length();
float e_R_z_cos = R_z * R_sp_z;
/* calculate weight for yaw control */
float yaw_w = R_sp(2, 2) * R_sp(2, 2);
/* calculate rotation matrix after roll/pitch only rotation */
math::Matrix<3, 3> R_rp;
if (e_R_z_sin > 0.0f) {
/* get axis-angle representation */
float e_R_z_angle = atan2f(e_R_z_sin, e_R_z_cos);
math::Vector<3> e_R_z_axis = e_R / e_R_z_sin;
e_R = e_R_z_axis * e_R_z_angle;
/* cross product matrix for e_R_axis */
math::Matrix<3, 3> e_R_cp;
e_R_cp.zero();
e_R_cp(0, 1) = -e_R_z_axis(2);
e_R_cp(0, 2) = e_R_z_axis(1);
e_R_cp(1, 0) = e_R_z_axis(2);
e_R_cp(1, 2) = -e_R_z_axis(0);
e_R_cp(2, 0) = -e_R_z_axis(1);
e_R_cp(2, 1) = e_R_z_axis(0);
/* rotation matrix for roll/pitch only rotation */
R_rp = R * (_I + e_R_cp * e_R_z_sin + e_R_cp * e_R_cp * (1.0f - e_R_z_cos));
} else {
/* zero roll/pitch rotation */
R_rp = R;
}
/* R_rp and R_sp has the same Z axis, calculate yaw error */
math::Vector<3> R_sp_x(R_sp(0, 0), R_sp(1, 0), R_sp(2, 0));
math::Vector<3> R_rp_x(R_rp(0, 0), R_rp(1, 0), R_rp(2, 0));
e_R(2) = atan2f((R_rp_x % R_sp_x) * R_sp_z, R_rp_x * R_sp_x) * yaw_w;
if (e_R_z_cos < 0.0f) {
/* for large thrust vector rotations use another rotation method:
* calculate angle and axis for R -> R_sp rotation directly */
math::Quaternion q_error;
q_error.from_dcm(R.transposed() * R_sp);
math::Vector<3> e_R_d = q_error(0) >= 0.0f ? q_error.imag() * 2.0f : -q_error.imag() * 2.0f;
/* use fusion of Z axis based rotation and direct rotation */
float direct_w = e_R_z_cos * e_R_z_cos * yaw_w;
e_R = e_R * (1.0f - direct_w) + e_R_d * direct_w;
}
/* calculate angular rates setpoint */
_rates_sp = _params.att_p.emult(e_R);
/* limit rates */
for (int i = 0; i < 3; i++) {
if ((_v_control_mode.flag_control_velocity_enabled || _v_control_mode.flag_control_auto_enabled) &&
!_v_control_mode.flag_control_manual_enabled) {
_rates_sp(i) = math::constrain(_rates_sp(i), -_params.auto_rate_max(i), _params.auto_rate_max(i));
} else {
_rates_sp(i) = math::constrain(_rates_sp(i), -_params.mc_rate_max(i), _params.mc_rate_max(i));
}
}
/* feed forward yaw setpoint rate */
_rates_sp(2) += _v_att_sp.yaw_sp_move_rate * yaw_w * _params.yaw_ff;
}
/*
* Throttle PID attenuation
* Function visualization available here https://www.desmos.com/calculator/gn4mfoddje
* Input: 'tpa_breakpoint', 'tpa_rate', '_thrust_sp'
* Output: 'pidAttenuationPerAxis' vector
*/
math::Vector<3>
MulticopterAttitudeControl::pid_attenuations(float tpa_breakpoint, float tpa_rate)
{
/* throttle pid attenuation factor */
float tpa = 1.0f - tpa_rate * (fabsf(_v_rates_sp.thrust) - tpa_breakpoint) / (1.0f - tpa_breakpoint);
tpa = fmaxf(TPA_RATE_LOWER_LIMIT, fminf(1.0f, tpa));
math::Vector<3> pidAttenuationPerAxis;
pidAttenuationPerAxis(AXIS_INDEX_ROLL) = tpa;
pidAttenuationPerAxis(AXIS_INDEX_PITCH) = tpa;
pidAttenuationPerAxis(AXIS_INDEX_YAW) = 1.0;
return pidAttenuationPerAxis;
}
/*
* Attitude rates controller.
* Input: '_rates_sp' vector, '_thrust_sp'
* Output: '_att_control' vector
*/
void
MulticopterAttitudeControl::control_attitude_rates(float dt)
{
/* reset integral if disarmed */
if (!_armed.armed || !_vehicle_status.is_rotary_wing) {
_rates_int.zero();
}
/* get transformation matrix from sensor/board to body frame */
get_rot_matrix((enum Rotation)_params.board_rotation, &_board_rotation);
/* fine tune the rotation */
math::Matrix<3, 3> board_rotation_offset;
board_rotation_offset.from_euler(M_DEG_TO_RAD_F * _params.board_offset[0],
M_DEG_TO_RAD_F * _params.board_offset[1],
M_DEG_TO_RAD_F * _params.board_offset[2]);
_board_rotation = board_rotation_offset * _board_rotation;
// get the raw gyro data and correct for thermal errors
math::Vector<3> rates;
if (_selected_gyro == 0) {
rates(0) = (_sensor_gyro.x - _sensor_correction.gyro_offset_0[0]) * _sensor_correction.gyro_scale_0[0];
rates(1) = (_sensor_gyro.y - _sensor_correction.gyro_offset_0[1]) * _sensor_correction.gyro_scale_0[1];
rates(2) = (_sensor_gyro.z - _sensor_correction.gyro_offset_0[2]) * _sensor_correction.gyro_scale_0[2];
} else if (_selected_gyro == 1) {
rates(0) = (_sensor_gyro.x - _sensor_correction.gyro_offset_1[0]) * _sensor_correction.gyro_scale_1[0];
rates(1) = (_sensor_gyro.y - _sensor_correction.gyro_offset_1[1]) * _sensor_correction.gyro_scale_1[1];
rates(2) = (_sensor_gyro.z - _sensor_correction.gyro_offset_1[2]) * _sensor_correction.gyro_scale_1[2];
} else if (_selected_gyro == 2) {
rates(0) = (_sensor_gyro.x - _sensor_correction.gyro_offset_2[0]) * _sensor_correction.gyro_scale_2[0];