mirror of https://github.com/ArduPilot/ardupilot
148 lines
8.3 KiB
C
148 lines
8.3 KiB
C
#pragma once
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#include <AP_HAL/AP_HAL.h>
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#include <AP_HAL/AP_HAL_Boards.h>
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#include "vector2.h"
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#include "vector3.h"
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#ifndef HAL_WITH_POSTYPE_DOUBLE
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#define HAL_WITH_POSTYPE_DOUBLE BOARD_FLASH_SIZE > 1024
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#endif
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#if HAL_WITH_POSTYPE_DOUBLE
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typedef double postype_t;
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typedef Vector2d Vector2p;
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typedef Vector3d Vector3p;
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#define topostype todouble
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#else
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typedef float postype_t;
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typedef Vector2f Vector2p;
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typedef Vector3f Vector3p;
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#define topostype tofloat
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#endif
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/*
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common controller helper functions
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*/
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// update_vel_accel - single axis projection of velocity, vel, forwards in time based on a time step of dt and acceleration of accel.
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// the velocity is not moved in the direction of limit if limit is not set to zero.
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// limit - specifies if the system is unable to continue to accelerate.
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// vel_error - specifies the direction of the velocity error used in limit handling.
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void update_vel_accel(float& vel, float accel, float dt, float limit, float vel_error);
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// update_pos_vel_accel - single axis projection of position and velocity forward in time based on a time step of dt and acceleration of accel.
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// the position and velocity is not moved in the direction of limit if limit is not set to zero.
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// limit - specifies if the system is unable to continue to accelerate.
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// pos_error and vel_error - specifies the direction of the velocity error used in limit handling.
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void update_pos_vel_accel(postype_t& pos, float& vel, float accel, float dt, float limit, float pos_error, float vel_error);
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// update_vel_accel - dual axis projection of position and velocity, pos and vel, forwards in time based on a time step of dt and acceleration of accel.
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// the velocity is not moved in the direction of limit if limit is not set to zero.
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// limit - specifies if the system is unable to continue to accelerate.
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// pos_error and vel_error - specifies the direction of the velocity error used in limit handling.
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void update_vel_accel_xy(Vector2f& vel, const Vector2f& accel, float dt, const Vector2f& limit, const Vector2f& vel_error);
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// update_pos_vel_accel - dual axis projection of position and velocity, pos and vel, forwards in time based on a time step of dt and acceleration of accel.
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// the position and velocity is not moved in the direction of limit if limit is not set to zero.
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// limit - specifies if the system is unable to continue to accelerate.
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// pos_error and vel_error - specifies the direction of the velocity error used in limit handling.
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void update_pos_vel_accel_xy(Vector2p& pos, Vector2f& vel, const Vector2f& accel, float dt, const Vector2f& limit, const Vector2f& pos_error, const Vector2f& vel_error);
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/* shape_accel calculates a jerk limited path from the current acceleration to an input acceleration.
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The function takes the current acceleration and calculates the required jerk limited adjustment to the acceleration for the next time dt.
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The kinematic path is constrained by :
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acceleration limits - accel_min, accel_max,
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time constant - tc.
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The time constant defines the acceleration error decay in the kinematic path as the system approaches constant acceleration.
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The time constant also defines the time taken to achieve the maximum acceleration.
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The time constant must be positive.
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The function alters the variable accel to follow a jerk limited kinematic path to accel_input.
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*/
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void shape_accel(float accel_input, float& accel,
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float jerk_max, float dt);
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// 2D version
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void shape_accel_xy(const Vector2f& accel_input, Vector2f& accel,
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float jerk_max, float dt);
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void shape_accel_xy(const Vector3f& accel_input, Vector3f& accel,
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float jerk_max, float dt);
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/* shape_vel_accel and shape_vel_xy calculate a jerk limited path from the current position, velocity and acceleration to an input velocity.
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The function takes the current position, velocity, and acceleration and calculates the required jerk limited adjustment to the acceleration for the next time dt.
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The kinematic path is constrained by :
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maximum velocity - vel_max,
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maximum acceleration - accel_max,
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time constant - tc.
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The time constant defines the acceleration error decay in the kinematic path as the system approaches constant acceleration.
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The time constant also defines the time taken to achieve the maximum acceleration.
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The time constant must be positive.
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The function alters the variable accel to follow a jerk limited kinematic path to vel_input and accel_input.
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The accel_max limit can be removed by setting it to zero.
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*/
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void shape_vel_accel(float vel_input, float accel_input,
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float vel, float& accel,
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float accel_min, float accel_max,
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float jerk_max, float dt, bool limit_total_accel);
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// 2D version
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void shape_vel_accel_xy(const Vector2f& vel_input1, const Vector2f& accel_input,
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const Vector2f& vel, Vector2f& accel,
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float accel_max, float jerk_max, float dt, bool limit_total_accel);
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/* shape_pos_vel_accel calculate a jerk limited path from the current position, velocity and acceleration to an input position and velocity.
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The function takes the current position, velocity, and acceleration and calculates the required jerk limited adjustment to the acceleration for the next time dt.
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The kinematic path is constrained by :
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maximum velocity - vel_max,
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maximum acceleration - accel_max,
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time constant - tc.
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The time constant defines the acceleration error decay in the kinematic path as the system approaches constant acceleration.
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The time constant also defines the time taken to achieve the maximum acceleration.
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The time constant must be positive.
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The function alters the variable accel to follow a jerk limited kinematic path to pos_input, vel_input and accel_input.
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The vel_max, vel_correction_max, and accel_max limits can be removed by setting the desired limit to zero.
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*/
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void shape_pos_vel_accel(const postype_t pos_input, float vel_input, float accel_input,
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const postype_t pos, float vel, float& accel,
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float vel_min, float vel_max,
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float accel_min, float accel_max,
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float jerk_max, float dt, bool limit_total_accel);
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// 2D version
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void shape_pos_vel_accel_xy(const Vector2p& pos_input, const Vector2f& vel_input, const Vector2f& accel_input,
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const Vector2p& pos, const Vector2f& vel, Vector2f& accel,
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float vel_max, float accel_max,
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float jerk_max, float dt, bool limit_total_accel);
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/* limit_accel_xy limits the acceleration to prioritise acceleration perpendicular to the provided velocity vector.
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Input parameters are:
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vel is the velocity vector used to define the direction acceleration limit is biased in.
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accel is the acceleration vector to be limited.
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accel_max is the maximum length of the acceleration vector after being limited.
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Returns true when accel vector has been limited.
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*/
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bool limit_accel_xy(const Vector2f& vel, Vector2f& accel, float accel_max);
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// sqrt_controller calculates the correction based on a proportional controller with piecewise sqrt sections to constrain second derivative.
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float sqrt_controller(float error, float p, float second_ord_lim, float dt);
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// sqrt_controller calculates the correction based on a proportional controller with piecewise sqrt sections to constrain second derivative.
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Vector2f sqrt_controller(const Vector2f& error, float p, float second_ord_lim, float dt);
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// inv_sqrt_controller calculates the inverse of the sqrt controller.
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// This function calculates the input (aka error) to the sqrt_controller required to achieve a given output.
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float inv_sqrt_controller(float output, float p, float D_max);
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// stopping_distance calculates the stopping distance for the square root controller based deceleration path.
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float stopping_distance(float velocity, float p, float accel_max);
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// kinematic_limit calculates the maximum acceleration or velocity in a given direction.
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// based on horizontal and vertical limits.
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float kinematic_limit(Vector3f direction, float max_xy, float max_z_pos, float max_z_neg);
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// input_expo calculates the expo function on the normalised input.
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// The input must be in the range of -1 to 1.
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// The expo should be less than 1.0 but limited to be less than 0.95.
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float input_expo(float input, float expo);
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