ardupilot/APMrover2/mode_follow.cpp

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#include "mode.h"
#include "Rover.h"
// initialize follow mode
bool ModeFollow::_enter()
{
if (!g2.follow.enabled()) {
return false;
}
// initialise waypoint speed
set_desired_speed_to_default();
// initialise heading to current heading
_desired_yaw_cd = ahrs.yaw_sensor;
_yaw_error_cd = 0.0f;
return true;
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}
void ModeFollow::update()
{
// stop vehicle if no speed estimate
float speed;
if (!attitude_control.get_forward_speed(speed)) {
// no valid speed so stop
g2.motors.set_throttle(0.0f);
g2.motors.set_steering(0.0f);
return;
}
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Vector3f dist_vec; // vector to lead vehicle
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Vector3f dist_vec_offs; // vector to lead vehicle + offset
Vector3f vel_of_target; // velocity of lead vehicle
// if no target simply stop the vehicle
if (!g2.follow.get_target_dist_and_vel_ned(dist_vec, dist_vec_offs, vel_of_target)) {
_reached_destination = true;
stop_vehicle();
return;
}
// calculate desired velocity vector
Vector2f desired_velocity_ne;
const float kp = g2.follow.get_pos_p().kP();
desired_velocity_ne.x = vel_of_target.x + (dist_vec_offs.x * kp);
desired_velocity_ne.y = vel_of_target.y + (dist_vec_offs.y * kp);
// if desired velocity is zero stop vehicle
if (is_zero(desired_velocity_ne.x) && is_zero(desired_velocity_ne.y)) {
_reached_destination = true;
stop_vehicle();
return;
}
// we have not reached the target
_reached_destination = false;
// scale desired velocity to stay within horizontal speed limit
float desired_speed = safe_sqrt(sq(desired_velocity_ne.x) + sq(desired_velocity_ne.y));
if (!is_zero(desired_speed) && (desired_speed > _desired_speed)) {
const float scalar_xy = _desired_speed / desired_speed;
desired_velocity_ne *= scalar_xy;
desired_speed = _desired_speed;
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}
// calculate vehicle heading
_desired_yaw_cd = wrap_180_cd(atan2f(desired_velocity_ne.y, desired_velocity_ne.x) * DEGX100);
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// run steering and throttle controllers
calc_steering_to_heading(_desired_yaw_cd);
calc_throttle(calc_reduced_speed_for_turn_or_distance(desired_speed), false, true);
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}