ardupilot/ArduPlane/reverse_thrust.cpp

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/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
reverse thrust support functions
*/
#include "Plane.h"
/*
see if reverse thrust should be allowed in the current flight state
*/
bool Plane::allow_reverse_thrust(void) const
{
// check if we should allow reverse thrust
bool allow = false;
if (g.use_reverse_thrust == USE_REVERSE_THRUST_NEVER || !have_reverse_thrust()) {
return false;
}
switch (control_mode->mode_number()) {
case Mode::Number::AUTO:
{
uint16_t nav_cmd = mission.get_current_nav_cmd().id;
// never allow reverse thrust during takeoff
if (nav_cmd == MAV_CMD_NAV_TAKEOFF) {
return false;
}
// always allow regardless of mission item
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_AUTO_ALWAYS);
// landing
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_AUTO_LAND_APPROACH) &&
(nav_cmd == MAV_CMD_NAV_LAND);
// LOITER_TO_ALT
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_AUTO_LOITER_TO_ALT) &&
(nav_cmd == MAV_CMD_NAV_LOITER_TO_ALT);
// any Loiter (including LOITER_TO_ALT)
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_AUTO_LOITER_ALL) &&
(nav_cmd == MAV_CMD_NAV_LOITER_TIME ||
nav_cmd == MAV_CMD_NAV_LOITER_TO_ALT ||
nav_cmd == MAV_CMD_NAV_LOITER_TURNS ||
nav_cmd == MAV_CMD_NAV_LOITER_UNLIM);
// waypoints
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_AUTO_WAYPOINT) &&
(nav_cmd == MAV_CMD_NAV_WAYPOINT ||
nav_cmd == MAV_CMD_NAV_SPLINE_WAYPOINT);
// we are on a landing pattern
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_AUTO_LANDING_PATTERN) &&
mission.get_in_landing_sequence_flag();
}
break;
case Mode::Number::LOITER:
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_LOITER);
break;
case Mode::Number::RTL:
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_RTL);
break;
case Mode::Number::CIRCLE:
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_CIRCLE);
break;
case Mode::Number::CRUISE:
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_CRUISE);
break;
case Mode::Number::FLY_BY_WIRE_B:
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_FBWB);
break;
case Mode::Number::AVOID_ADSB:
case Mode::Number::GUIDED:
allow |= (g.use_reverse_thrust & USE_REVERSE_THRUST_GUIDED);
break;
case Mode::Number::TAKEOFF:
allow = false;
break;
default:
// all other control_modes are auto_throttle_mode=false.
// If we are not controlling throttle, don't limit it.
allow = true;
break;
}
// cope with bitwise ops above
return allow != false;
}
/*
return true if we are configured to support reverse thrust
*/
bool Plane::have_reverse_thrust(void) const
{
return aparm.throttle_min < 0;
}
/*
return control in from the radio throttle channel.
*/
int16_t Plane::get_throttle_input(bool no_deadzone) const
{
int16_t ret;
if (no_deadzone) {
ret = channel_throttle->get_control_in_zero_dz();
} else {
ret = channel_throttle->get_control_in();
}
if (reversed_throttle) {
// RC option for reverse throttle has been set
ret = -ret;
}
return ret;
}