ardupilot/ArduPlane/mode_rtl.cpp

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#include "mode.h"
#include "Plane.h"
bool ModeRTL::_enter()
{
plane.prev_WP_loc = plane.current_loc;
plane.do_RTL(plane.get_RTL_altitude_cm());
plane.rtl.done_climb = false;
plane.vtol_approach_s.approach_stage = Plane::Landing_ApproachStage::RTL;
// do not check if we have reached the loiter target if switching from loiter this will trigger as the nav controller has not yet proceeded the new destination
switch_QRTL(false);
return true;
}
void ModeRTL::update()
{
plane.calc_nav_roll();
plane.calc_nav_pitch();
plane.calc_throttle();
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bool alt_threshold_reached = false;
if (plane.g2.flight_options & FlightOptions::CLIMB_BEFORE_TURN) {
// Climb to ALT_HOLD_RTL before turning. This overrides RTL_CLIMB_MIN.
alt_threshold_reached = plane.current_loc.alt > plane.next_WP_loc.alt;
} else if (plane.g2.rtl_climb_min > 0) {
/*
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when RTL first starts limit bank angle to LEVEL_ROLL_LIMIT
until we have climbed by RTL_CLIMB_MIN meters
*/
alt_threshold_reached = (plane.current_loc.alt - plane.prev_WP_loc.alt)*0.01 > plane.g2.rtl_climb_min;
} else {
return;
}
if (!plane.rtl.done_climb && alt_threshold_reached) {
plane.prev_WP_loc = plane.current_loc;
plane.setup_glide_slope();
plane.rtl.done_climb = true;
}
if (!plane.rtl.done_climb) {
// Constrain the roll limit as a failsafe, that way if something goes wrong the plane will
// eventually turn back and go to RTL instead of going perfectly straight. This also leaves
// some leeway for fighting wind.
plane.roll_limit_cd = MIN(plane.roll_limit_cd, plane.g.level_roll_limit*100);
plane.nav_roll_cd = constrain_int32(plane.nav_roll_cd, -plane.roll_limit_cd, plane.roll_limit_cd);
}
}
void ModeRTL::navigate()
{
if (plane.control_mode->mode_number() != QRTL) {
// QRTL shares this navigate function with RTL
if (plane.quadplane.available() && (plane.quadplane.rtl_mode == QuadPlane::RTL_MODE::VTOL_APPROACH_QRTL)) {
// VTOL approach landing
AP_Mission::Mission_Command cmd;
cmd.content.location = plane.next_WP_loc;
plane.verify_landing_vtol_approach(cmd);
if (plane.vtol_approach_s.approach_stage == Plane::Landing_ApproachStage::VTOL_LANDING) {
plane.set_mode(plane.mode_qrtl, ModeReason::RTL_COMPLETE_SWITCHING_TO_VTOL_LAND_RTL);
}
return;
}
if ((AP_HAL::millis() - plane.last_mode_change_ms > 1000) && switch_QRTL()) {
return;
}
}
if (plane.g.rtl_autoland == 1 &&
!plane.auto_state.checked_for_autoland &&
plane.reached_loiter_target() &&
labs(plane.altitude_error_cm) < 1000) {
// we've reached the RTL point, see if we have a landing sequence
if (plane.mission.jump_to_landing_sequence()) {
// switch from RTL -> AUTO
plane.mission.set_force_resume(true);
plane.set_mode(plane.mode_auto, ModeReason::RTL_COMPLETE_SWITCHING_TO_FIXEDWING_AUTOLAND);
}
// prevent running the expensive jump_to_landing_sequence
// on every loop
plane.auto_state.checked_for_autoland = true;
}
else if (plane.g.rtl_autoland == 2 &&
!plane.auto_state.checked_for_autoland) {
// Go directly to the landing sequence
if (plane.mission.jump_to_landing_sequence()) {
// switch from RTL -> AUTO
plane.mission.set_force_resume(true);
plane.set_mode(plane.mode_auto, ModeReason::RTL_COMPLETE_SWITCHING_TO_FIXEDWING_AUTOLAND);
}
// prevent running the expensive jump_to_landing_sequence
// on every loop
plane.auto_state.checked_for_autoland = true;
}
uint16_t radius = abs(plane.g.rtl_radius);
if (radius > 0) {
plane.loiter.direction = (plane.g.rtl_radius < 0) ? -1 : 1;
}
plane.update_loiter(radius);
}
// Switch to QRTL if enabled and within radius
bool ModeRTL::switch_QRTL(bool check_loiter_target)
{
if (!plane.quadplane.available() || (plane.quadplane.rtl_mode != QuadPlane::RTL_MODE::SWITCH_QRTL)) {
return false;
}
uint16_t qrtl_radius = abs(plane.g.rtl_radius);
if (qrtl_radius == 0) {
qrtl_radius = abs(plane.aparm.loiter_radius);
}
if ( (check_loiter_target && plane.nav_controller->reached_loiter_target()) ||
plane.current_loc.past_interval_finish_line(plane.prev_WP_loc, plane.next_WP_loc) ||
plane.auto_state.wp_distance < MAX(qrtl_radius, plane.quadplane.stopping_distance())) {
/*
for a quadplane in RTL mode we switch to QRTL when we
are within the maximum of the stopping distance and the
RTL_RADIUS
*/
plane.set_mode(plane.mode_qrtl, ModeReason::RTL_COMPLETE_SWITCHING_TO_VTOL_LAND_RTL);
return true;
}
return false;
}