mirror of https://github.com/ArduPilot/ardupilot
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
#include "mode.h"
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#include "Plane.h"
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bool ModeLoiter::_enter()
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{
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plane.do_loiter_at_location();
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plane.setup_terrain_target_alt(plane.next_WP_loc);
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plane.loiter_angle_reset();
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return true;
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}
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void ModeLoiter::update()
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{
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plane.calc_nav_roll();
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plane.calc_nav_pitch();
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plane.calc_throttle();
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}
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bool ModeLoiter::isHeadingLinedUp(const Location loiterCenterLoc, const Location targetLoc)
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{
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// Return true if current heading is aligned to vector to targetLoc.
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// Tolerance is initially 10 degrees and grows at 10 degrees for each loiter circle completed.
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const uint16_t loiterRadius = abs(plane.aparm.loiter_radius);
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if (loiterCenterLoc.get_distance(targetLoc) < loiterRadius + loiterRadius*0.05) {
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/* Whenever next waypoint is within the loiter radius plus 5%,
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maintaining loiter would prevent us from ever pointing toward the next waypoint.
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Hence break out of loiter immediately
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*/
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return true;
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}
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// Bearing in centi-degrees
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const int32_t bearing_cd = plane.current_loc.get_bearing_to(targetLoc);
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return isHeadingLinedUp_cd(bearing_cd);
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}
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bool ModeLoiter::isHeadingLinedUp_cd(const int32_t bearing_cd)
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{
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// Return true if current heading is aligned to bearing_cd.
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// Tolerance is initially 10 degrees and grows at 10 degrees for each loiter circle completed.
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// get current heading.
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const int32_t heading_cd = (wrap_360(degrees(plane.ahrs.groundspeed_vector().angle())))*100;
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const int32_t heading_err_cd = wrap_180_cd(bearing_cd - heading_cd);
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/*
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Check to see if the the plane is heading toward the land
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waypoint. We use 20 degrees (+/-10 deg) of margin so that
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we can handle 200 degrees/second of yaw.
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After every full circle, extend acceptance criteria to ensure
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aircraft will not loop forever in case high winds are forcing
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it beyond 200 deg/sec when passing the desired exit course
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*/
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// Use integer division to get discrete steps
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const int32_t expanded_acceptance = 1000 * (labs(plane.loiter.sum_cd) / 36000);
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if (labs(heading_err_cd) <= 1000 + expanded_acceptance) {
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// Want to head in a straight line from _here_ to the next waypoint instead of center of loiter wp
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// 0 to xtrack from center of waypoint, 1 to xtrack from tangent exit location
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if (plane.next_WP_loc.loiter_xtrack) {
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plane.next_WP_loc = plane.current_loc;
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}
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return true;
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}
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return false;
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}
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void ModeLoiter::navigate()
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{
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// Zero indicates to use WP_LOITER_RAD
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plane.update_loiter(0);
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}
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