ardupilot/libraries/AR_WPNav/AR_PivotTurn.h

71 lines
2.8 KiB
C++

#pragma once
#include <AP_Common/AP_Common.h>
#include <APM_Control/AR_AttitudeControl.h>
/*
* Pivot Turn controller for skid-steering rovers and boats
*
* How-to-Use:
* 1. call "enable(true)" once for skid-steering vehicles to enable this controller
* 2. before vehicle starts towards a waypoint call "check_activation" and provide the earth-frame heading to the waypoint
* this may change the controller's internal state to "active"
* 3. on each main loop iteration call "active()" to see if this controller thinks it is controllering the vehicle
* 4. call "get_turn_rate_rads()" to retrieve the desired turn rate towards the next waypoint
* 5. pass above turn rate into the rate controller, set speed controller's speed to zero
* 6. this controller's "active" state will change to false once it has completed the pivot turn
*/
class AR_PivotTurn {
public:
// constructor
AR_PivotTurn(AR_AttitudeControl& atc);
// enable or disable pivot controller
void enable(bool enable_pivot);
// true if this controller is controlling vehicle
bool active() const;
// checks if pivot turns should be activated or deactivated
// force_active should be true if the caller wishes to trigger the start of a pivot turn regardless of the heading error
void check_activation(float desired_heading_deg, bool force_active = false);
// check if pivot turn would be activated given an expected change in yaw in degrees
// note this does not actually active the pivot turn. To activate use the check_activation method
bool would_activate(float yaw_change_deg) const WARN_IF_UNUSED;
// forcibly deactivate this controller
void deactivate() { _active = false; };
// get turn rate (in rad/sec)
// desired heading should be the heading towards the next waypoint in degrees
// dt should be the time since the last call in seconds
float get_turn_rate_rads(float desired_heading_deg, float dt);
// accessors for parameter values
float get_rate_max() const { return _rate_max; }
// parameter var table
static const struct AP_Param::GroupInfo var_info[];
private:
// return post-turn delay duration in milliseconds
uint32_t get_delay_duration_ms() const;
// parameters
AP_Int16 _angle; // minimum angle error (in degrees) that leads to pivot turn
AP_Int16 _rate_max; // maximum turn rate (in degrees) during pivot turn
AP_Float _delay; // waiting time (in seconds) after pivot turn completes
// references
AR_AttitudeControl& _atc; // rover attitude control library
// local variables
bool _enabled; // true if vehicle can pivot
bool _active; // true if vehicle is currently pivoting
uint32_t _delay_start_ms; // system time when post-turn delay started
};