// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: t -*- /// @file AC_AttitudeControl.h /// @brief ArduCopter attitude control library #ifndef AC_AttitudeControl_H #define AC_AttitudeControl_H #include #include #include #include #include #include #include #include // To-Do: change the name or move to AP_Math? #define AC_ATTITUDE_CONTROL_DEGX100 5729.57795f // constant to convert from radians to centi-degrees #define AC_ATTITUDE_ACCEL_RP_CONTROLLER_MIN 36000.0f// minimum body-frame acceleration limit for the stability controller (for roll and pitch axis) #define AC_ATTITUDE_ACCEL_RP_CONTROLLER_MAX 72000.0f// maximum body-frame acceleration limit for the stability controller (for roll and pitch axis) #define AC_ATTITUDE_ACCEL_Y_CONTROLLER_MIN 18000.0f// minimum body-frame acceleration limit for the stability controller (for yaw axis) #define AC_ATTITUDE_ACCEL_Y_CONTROLLER_MAX 36000.0f// maximum body-frame acceleration limit for the stability controller (for yaw axis) #define AC_ATTITUDE_CONTROL_SLEW_YAW_DEFAULT 1000 // constraint on yaw angle error in degrees. This should lead to maximum turn rate of 10deg/sed * Stab Rate P so by default will be 45deg/sec. #define AC_ATTITUDE_CONTROL_ACCEL_RP_MAX_DEFAULT 0 // default maximum acceleration for roll/pitch axis in centi-degrees/sec/sec #define AC_ATTITUDE_CONTROL_ACCEL_Y_MAX_DEFAULT 0 // default maximum acceleration for yaw axis in centi-degrees/sec/sec #define AC_ATTITUDE_RATE_CONTROLLER_TIMEOUT 1.0f // body-frame rate controller timeout in seconds #define AC_ATTITUDE_RATE_RP_CONTROLLER_OUT_MAX 5000.0f // body-frame rate controller maximum output (for roll-pitch axis) #define AC_ATTITUDE_RATE_YAW_CONTROLLER_OUT_MAX 4500.0f // body-frame rate controller maximum output (for yaw axis) #define AC_ATTITUDE_ANGLE_YAW_CONTROLLER_OUT_MAX 4500.0f // earth-frame angle controller maximum output (for yaw axis) #define AC_ATTITUDE_ANGLE_CONTROLLER_ANGLE_MAX 4500.0f // earth-frame angle controller maximum input angle (To-Do: replace with reference to aparm.angle_max) #define AC_ATTITUDE_RATE_STAB_ROLL_OVERSHOOT_ANGLE_MAX 30000.0f // earth-frame rate stabilize controller's maximum overshoot angle (never limited) #define AC_ATTITUDE_RATE_STAB_PITCH_OVERSHOOT_ANGLE_MAX 30000.0f // earth-frame rate stabilize controller's maximum overshoot angle (never limited) #define AC_ATTITUDE_RATE_STAB_YAW_OVERSHOOT_ANGLE_MAX 1000.0f // earth-frame rate stabilize controller's maximum overshoot angle #define AC_ATTITUDE_RATE_STAB_ACRO_OVERSHOOT_ANGLE_MAX 3000.0f // earth-frame rate stabilize controller's maximum overshoot angle #define AC_ATTITUDE_100HZ_DT 0.0100f // delta time in seconds for 100hz update rate #define AC_ATTITUDE_400HZ_DT 0.0025f // delta time in seconds for 400hz update rate #define AC_ATTITUDE_CONTROL_RATE_BF_FF_DEFAULT 0 // body-frame rate feedforward enabled by default class AC_AttitudeControl { public: AC_AttitudeControl( AP_AHRS &ahrs, const AP_Vehicle::MultiCopter &aparm, AP_Motors& motors, AC_P& pi_angle_roll, AC_P& pi_angle_pitch, AC_P& pi_angle_yaw, AC_PID& pid_rate_roll, AC_PID& pid_rate_pitch, AC_PID& pid_rate_yaw ) : _ahrs(ahrs), _aparm(aparm), _motors(motors), _p_angle_roll(pi_angle_roll), _p_angle_pitch(pi_angle_pitch), _p_angle_yaw(pi_angle_yaw), _pid_rate_roll(pid_rate_roll), _pid_rate_pitch(pid_rate_pitch), _pid_rate_yaw(pid_rate_yaw), _dt(AC_ATTITUDE_100HZ_DT), _angle_boost(0), _acro_angle_switch(0) { AP_Param::setup_object_defaults(this, var_info); // initialise flags _flags.limit_angle_to_rate_request = true; } // empty destructor to suppress compiler warning virtual ~AC_AttitudeControl() {} // // initialisation functions // // set_dt - sets time delta in seconds for all controllers (i.e. 100hz = 0.01, 400hz = 0.0025) void set_dt(float delta_sec); // save_accel_roll_max - sets and saves the roll acceleration limit void save_accel_roll_max(float accel_roll_max) { _accel_roll_max = accel_roll_max; _accel_roll_max.save(); } // save_accel_pitch_max - sets and saves the pitch acceleration limit void save_accel_pitch_max(float accel_pitch_max) { _accel_pitch_max = accel_pitch_max; _accel_pitch_max.save(); } // save_accel_yaw_max - sets and saves the yaw acceleration limit void save_accel_yaw_max(float accel_yaw_max) { _accel_yaw_max = accel_yaw_max; _accel_yaw_max.save(); } // relax_bf_rate_controller - ensure body-frame rate controller has zero errors to relax rate controller output void relax_bf_rate_controller(); // set_yaw_target_to_current_heading - sets yaw target to current heading void set_yaw_target_to_current_heading() { _angle_ef_target.z = _ahrs.yaw_sensor; } // // methods to be called by upper controllers to request and implement a desired attitude // // angle_ef_roll_pitch_rate_ef_yaw_smooth - attempts to maintain a roll and pitch angle and yaw rate (all earth frame) while smoothing the attitude based on the feel parameter // smoothing_gain : a number from 1 to 50 with 1 being sluggish and 50 being very crisp void angle_ef_roll_pitch_rate_ef_yaw_smooth(float roll_angle_ef, float pitch_angle_ef, float yaw_rate_ef, float smoothing_gain); // angle_ef_roll_pitch_rate_ef_yaw - attempts to maintain a roll and pitch angle and yaw rate (all earth frame) void angle_ef_roll_pitch_rate_ef_yaw(float roll_angle_ef, float pitch_angle_ef, float yaw_rate_ef); // angle_ef_roll_pitch_yaw - attempts to maintain a roll, pitch and yaw angle (all earth frame) // if yaw_slew is true then target yaw movement will be gradually moved to the new target based on the YAW_SLEW parameter void angle_ef_roll_pitch_yaw(float roll_angle_ef, float pitch_angle_ef, float yaw_angle_ef, bool slew_yaw); // rate_ef_roll_pitch_yaw - attempts to maintain a roll, pitch and yaw rate (all earth frame) void rate_ef_roll_pitch_yaw(float roll_rate_ef, float pitch_rate_ef, float yaw_rate_ef); // rate_bf_roll_pitch_yaw - attempts to maintain a roll, pitch and yaw rate (all body frame) void rate_bf_roll_pitch_yaw(float roll_rate_bf, float pitch_rate_bf, float yaw_rate_bf); // // rate_controller_run - run lowest level body-frame rate controller and send outputs to the motors // should be called at 100hz or more // virtual void rate_controller_run(); // // earth-frame <-> body-frame conversion functions // // frame_conversion_ef_to_bf - converts earth frame angles or rates to body frame void frame_conversion_ef_to_bf(const Vector3f& ef_vector, Vector3f &bf_vector); // frame_conversion_bf_to_ef - converts body frame angles or rates to earth frame // returns false if conversion fails due to gimbal lock bool frame_conversion_bf_to_ef(const Vector3f& bf_vector, Vector3f &ef_vector); // // public accessor functions // // limit_angle_to_rate_request void limit_angle_to_rate_request(bool limit_request) { _flags.limit_angle_to_rate_request = limit_request; } // angle_ef_targets - returns angle controller earth-frame targets (for reporting) const Vector3f& angle_ef_targets() const { return _angle_ef_target; } // rate_bf_targets - sets rate controller body-frame targets void rate_bf_roll_target(float rate_cds) { _rate_bf_target.x = rate_cds; } void rate_bf_pitch_target(float rate_cds) { _rate_bf_target.y = rate_cds; } void rate_bf_yaw_target(float rate_cds) { _rate_bf_target.z = rate_cds; } // Maximum roll rate step size that results in maximum output after 4 time steps float max_rate_step_bf_roll(); // Maximum pitch rate step size that results in maximum output after 4 time steps float max_rate_step_bf_pitch(); // Maximum yaw rate step size that results in maximum output after 4 time steps float max_rate_step_bf_yaw(); // Maximum roll step size that results in maximum output after 4 time steps float max_angle_step_bf_roll() { return max_rate_step_bf_roll()/_p_angle_roll.kP(); } // Maximum pitch step size that results in maximum output after 4 time steps float max_angle_step_bf_pitch() { return max_rate_step_bf_pitch()/_p_angle_pitch.kP(); } // Maximum yaw step size that results in maximum output after 4 time steps float max_angle_step_bf_yaw() { return max_rate_step_bf_yaw()/_p_angle_yaw.kP(); } // rate_ef_targets - returns rate controller body-frame targets (for reporting) const Vector3f& rate_bf_targets() const { return _rate_bf_target; } // bf_feedforward - enable or disable body-frame feed forward void bf_feedforward(bool enable_or_disable) { _rate_bf_ff_enabled = enable_or_disable; } // get_bf_feedforward - return body-frame feed forward setting bool get_bf_feedforward() { return _rate_bf_ff_enabled; } // enable_bf_feedforward - enable or disable body-frame feed forward void accel_limiting(bool enable_or_disable); // // throttle functions // // set_throttle_out - to be called by upper throttle controllers when they wish to provide throttle output directly to motors // provide 0 to cut motors void set_throttle_out(int16_t throttle_pwm, bool apply_angle_boost); // angle_boost - accessor for angle boost so it can be logged int16_t angle_boost() const { return _angle_boost; } // // helper functions // // lean_angle_max - maximum lean angle of the copter in centi-degrees int16_t lean_angle_max() const { return _aparm.angle_max; } // sqrt_controller - response based on the sqrt of the error instead of the more common linear response static float sqrt_controller(float error, float p, float second_ord_lim); // user settable parameters static const struct AP_Param::GroupInfo var_info[]; protected: // attitude control flags struct AttControlFlags { uint8_t limit_angle_to_rate_request : 1; // 1 if the earth frame angle controller is limiting it's maximum rate request } _flags; // update_ef_roll_angle_and_error - update _angle_ef_target.x using an earth frame roll rate request void update_ef_roll_angle_and_error(float roll_rate_ef, Vector3f &angle_ef_error, float overshoot_max); // update_ef_pitch_angle_and_error - update _angle_ef_target.y using an earth frame pitch rate request void update_ef_pitch_angle_and_error(float pitch_rate_ef, Vector3f &angle_ef_error, float overshoot_max); // update_ef_yaw_angle_and_error - update _angle_ef_target.z using an earth frame yaw rate request void update_ef_yaw_angle_and_error(float yaw_rate_ef, Vector3f &angle_ef_error, float overshoot_max); // integrate_bf_rate_error_to_angle_errors - calculates body frame angle errors // body-frame feed forward rates (centi-degrees / second) taken from _angle_bf_error // angle errors in centi-degrees placed in _angle_bf_error void integrate_bf_rate_error_to_angle_errors(); // update_rate_bf_targets - converts body-frame angle error to body-frame rate targets for roll, pitch and yaw axis // targets rates in centi-degrees taken from _angle_bf_error // results in centi-degrees/sec put into _rate_bf_target void update_rate_bf_targets(); // // body-frame rate controller // // rate_bf_to_motor_roll - ask the rate controller to calculate the motor outputs to achieve the target body-frame rate (in centi-degrees/sec) for roll, pitch and yaw float rate_bf_to_motor_roll(float rate_target_cds); float rate_bf_to_motor_pitch(float rate_target_cds); virtual float rate_bf_to_motor_yaw(float rate_target_cds); // // throttle methods // // get_angle_boost - calculate total body frame throttle required to produce the given earth frame throttle virtual int16_t get_angle_boost(int16_t throttle_pwm); // references to external libraries const AP_AHRS& _ahrs; const AP_Vehicle::MultiCopter &_aparm; AP_Motors& _motors; AC_P& _p_angle_roll; AC_P& _p_angle_pitch; AC_P& _p_angle_yaw; AC_PID& _pid_rate_roll; AC_PID& _pid_rate_pitch; AC_PID& _pid_rate_yaw; // parameters AP_Float _slew_yaw; // maximum rate the yaw target can be updated in Loiter, RTL, Auto flight modes AP_Float _accel_roll_max; // maximum rotation acceleration for earth-frame roll axis AP_Float _accel_pitch_max; // maximum rotation acceleration for earth-frame pitch axis AP_Float _accel_yaw_max; // maximum rotation acceleration for earth-frame yaw axis AP_Int8 _rate_bf_ff_enabled; // Enable/Disable body frame rate feed forward // internal variables // To-Do: make rate targets a typedef instead of Vector3f? float _dt; // time delta in seconds Vector3f _angle_ef_target; // angle controller earth-frame targets Vector3f _angle_bf_error; // angle controller body-frame error Vector3f _rate_bf_target; // rate controller body-frame targets Vector3f _rate_ef_desired; // earth-frame feed forward rates Vector3f _rate_bf_desired; // body-frame feed forward rates int16_t _angle_boost; // used only for logging int16_t _acro_angle_switch; // used only for logging }; #define AC_ATTITUDE_CONTROL_LOG_FORMAT(msg) { msg, sizeof(AC_AttitudeControl::log_Attitude), \ "ATT", "cccccCC", "RollIn,Roll,PitchIn,Pitch,YawIn,Yaw,NavYaw" } #endif //AC_AttitudeControl_H