ardupilot/libraries/APM_Control/AR_AttitudeControl.h

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#pragma once
#include <AP_AHRS/AP_AHRS.h>
#include <AP_Common/AP_Common.h>
#include <AC_PID/AC_PID.h>
#include <AC_PID/AC_P.h>
// attitude control default definition
#define AR_ATTCONTROL_STEER_ANG_P 1.00f
#define AR_ATTCONTROL_STEER_RATE_FF 0.20f
#define AR_ATTCONTROL_STEER_RATE_P 1.00f
#define AR_ATTCONTROL_STEER_RATE_I 0.50f
#define AR_ATTCONTROL_STEER_RATE_IMAX 1.00f
#define AR_ATTCONTROL_STEER_RATE_D 0.00f
#define AR_ATTCONTROL_STEER_RATE_FILT 50.00f
#define AR_ATTCONTROL_THR_SPEED_P 0.20f
#define AR_ATTCONTROL_THR_SPEED_I 0.20f
#define AR_ATTCONTROL_THR_SPEED_IMAX 1.00f
#define AR_ATTCONTROL_THR_SPEED_D 0.00f
#define AR_ATTCONTROL_THR_SPEED_FILT 50.00f
#define AR_ATTCONTROL_DT 0.02f
#define AR_ATTCONTROL_TIMEOUT_MS 200
// throttle/speed control maximum acceleration/deceleration (in m/s) (_ACCEL_MAX parameter default)
#define AR_ATTCONTROL_THR_ACCEL_MAX 5.00f
// minimum speed in m/s
#define AR_ATTCONTROL_STEER_SPEED_MIN 1.0f
// speed (in m/s) at or below which vehicle is considered stopped (_STOP_SPEED parameter default)
#define AR_ATTCONTROL_STOP_SPEED_DEFAULT 0.1f
class AR_AttitudeControl {
public:
// constructor
AR_AttitudeControl(AP_AHRS &ahrs);
//
// steering controller
//
// return a steering servo output from -1.0 to +1.0 given a desired lateral acceleration rate in m/s/s.
// positive lateral acceleration is to the right.
float get_steering_out_lat_accel(float desired_accel, bool skid_steering, bool motor_limit_left, bool motor_limit_right, bool reverse);
// return a steering servo output from -1 to +1 given a yaw error in radians
float get_steering_out_angle_error(float angle_err, bool skid_steering, bool motor_limit_left, bool motor_limit_right, bool reversed);
// return a steering servo output from -1 to +1 given a
// desired yaw rate in radians/sec. Positive yaw is to the right.
float get_steering_out_rate(float desired_rate, bool skid_steering, bool motor_limit_left, bool motor_limit_right, bool reverse);
// get latest desired turn rate in rad/sec recorded during calls to get_steering_out_rate. For reporting purposes only
float get_desired_turn_rate() const;
// get latest desired lateral acceleration in m/s/s recorded during calls to get_steering_out_lat_accel. For reporting purposes only
float get_desired_lat_accel() const;
// get actual lateral acceleration in m/s/s. returns true on success. For reporting purposes only
bool get_lat_accel(float &lat_accel) const;
//
// throttle / speed controller
//
// set limits used by throttle controller
// forward/back acceleration max in m/s/s
// forward/back deceleartion max in m/s/s
void set_throttle_limits(float throttle_accel_max, float throttle_decel_max);
// return a throttle output from -1 to +1 given a desired speed in m/s (use negative speeds to travel backwards)
// motor_limit should be true if motors have hit their upper or lower limits
// cruise speed should be in m/s, cruise throttle should be a number from -1 to +1
float get_throttle_out_speed(float desired_speed, bool motor_limit_low, bool motor_limit_high, float cruise_speed, float cruise_throttle);
// return a throttle output from -1 to +1 to perform a controlled stop. stopped is set to true once stop has been completed
float get_throttle_out_stop(bool motor_limit_low, bool motor_limit_high, float cruise_speed, float cruise_throttle, bool &stopped);
// low level control accessors for reporting and logging
AC_P& get_steering_angle_p() { return _steer_angle_p; }
AC_PID& get_steering_rate_pid() { return _steer_rate_pid; }
AC_PID& get_throttle_speed_pid() { return _throttle_speed_pid; }
// get forward speed in m/s (earth-frame horizontal velocity but only along vehicle x-axis). returns true on success
bool get_forward_speed(float &speed) const;
// get throttle/speed controller maximum acceleration (also used for deceleration)
float get_accel_max() const { return MAX(_throttle_accel_max, 0.0f); }
// get latest desired speed recorded during call to get_throttle_out_speed. For reporting purposes only
float get_desired_speed() const;
// get minimum stopping distance (in meters) given a speed (in m/s)
float get_stopping_distance(float speed);
// parameter var table
static const struct AP_Param::GroupInfo var_info[];
private:
// external references
const AP_AHRS &_ahrs;
// parameters
AC_P _steer_angle_p; // steering angle controller
AC_PID _steer_rate_pid; // steering rate controller
AC_PID _throttle_speed_pid; // throttle speed controller
AP_Float _throttle_accel_max; // speed/throttle control acceleration (and deceleration) maximum in m/s/s. 0 to disable limits
AP_Int8 _brake_enable; // speed control brake enable/disable. if set to 1 a reversed output to the motors to slow the vehicle.
AP_Float _stop_speed; // speed control stop speed. Motor outputs to zero once vehicle speed falls below this value
// steering control
uint32_t _steer_lat_accel_last_ms; // system time of last call to lateral acceleration controller (i.e. get_steering_out_lat_accel)
uint32_t _steer_turn_last_ms; // system time of last call to steering rate controller
float _desired_lat_accel; // desired lateral acceleration from latest call to get_steering_out_lat_accel (for reporting purposes)
float _desired_turn_rate; // desired turn rate either from external caller or from lateral acceleration controller (for reporting purpose)
// throttle control
uint32_t _speed_last_ms; // system time of last call to get_throttle_out_speed
float _desired_speed; // last recorded desired speed
uint32_t _stop_last_ms; // system time the vehicle was at a complete stop
bool _throttle_limit_low; // throttle output was limited from going too low (used to reduce i-term buildup)
bool _throttle_limit_high; // throttle output was limited from going too high (used to reduce i-term buildup)
};