mirror of https://github.com/ArduPilot/ardupilot
103 lines
4.5 KiB
C++
103 lines
4.5 KiB
C++
#include "Sub.h"
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/*
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* control_althold.pde - init and run calls for althold, flight mode
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*/
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// althold_init - initialise althold controller
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bool Sub::althold_init()
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{
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#if CONFIG_HAL_BOARD != HAL_BOARD_SITL
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if (!ap.depth_sensor_present || failsafe.sensor_health) { // can't hold depth without a depth sensor, exit immediately.
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gcs().send_text(MAV_SEVERITY_WARNING, "BAD DEPTH");
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return false;
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}
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#endif
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// initialize vertical speeds and leash lengths
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// sets the maximum speed up and down returned by position controller
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pos_control.set_speed_z(-g.pilot_velocity_z_max, g.pilot_velocity_z_max);
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pos_control.set_accel_z(g.pilot_accel_z);
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// initialise position and desired velocity
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pos_control.set_alt_target(inertial_nav.get_altitude());
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pos_control.set_desired_velocity_z(inertial_nav.get_velocity_z());
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last_pilot_heading = ahrs.yaw_sensor;
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return true;
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}
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// althold_run - runs the althold controller
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// should be called at 100hz or more
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void Sub::althold_run()
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{
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uint32_t tnow = AP_HAL::millis();
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// initialize vertical speeds and acceleration
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pos_control.set_speed_z(-g.pilot_velocity_z_max, g.pilot_velocity_z_max);
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pos_control.set_accel_z(g.pilot_accel_z);
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if (!motors.armed()) {
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motors.set_desired_spool_state(AP_Motors::DESIRED_SPIN_WHEN_ARMED);
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// Sub vehicles do not stabilize roll/pitch/yaw when not auto-armed (i.e. on the ground, pilot has never raised throttle)
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attitude_control.set_throttle_out_unstabilized(0,true,g.throttle_filt);
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pos_control.relax_alt_hold_controllers(motors.get_throttle_hover());
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last_pilot_heading = ahrs.yaw_sensor;
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return;
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}
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motors.set_desired_spool_state(AP_Motors::DESIRED_THROTTLE_UNLIMITED);
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// get pilot desired lean angles
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float target_roll, target_pitch;
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get_pilot_desired_lean_angles(channel_roll->get_control_in(), channel_pitch->get_control_in(), target_roll, target_pitch, attitude_control.get_althold_lean_angle_max());
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// get pilot's desired yaw rate
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float target_yaw_rate = get_pilot_desired_yaw_rate(channel_yaw->get_control_in());
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// call attitude controller
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if (!is_zero(target_yaw_rate)) { // call attitude controller with rate yaw determined by pilot input
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attitude_control.input_euler_angle_roll_pitch_euler_rate_yaw(target_roll, target_pitch, target_yaw_rate, get_smoothing_gain());
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last_pilot_heading = ahrs.yaw_sensor;
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last_pilot_yaw_input_ms = tnow; // time when pilot last changed heading
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} else { // hold current heading
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// this check is required to prevent bounce back after very fast yaw maneuvers
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// the inertia of the vehicle causes the heading to move slightly past the point when pilot input actually stopped
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if (tnow < last_pilot_yaw_input_ms + 250) { // give 250ms to slow down, then set target heading
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target_yaw_rate = 0; // Stop rotation on yaw axis
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// call attitude controller with target yaw rate = 0 to decelerate on yaw axis
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attitude_control.input_euler_angle_roll_pitch_euler_rate_yaw(target_roll, target_pitch, target_yaw_rate, get_smoothing_gain());
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last_pilot_heading = ahrs.yaw_sensor; // update heading to hold
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} else { // call attitude controller holding absolute absolute bearing
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attitude_control.input_euler_angle_roll_pitch_yaw(target_roll, target_pitch, last_pilot_heading, true, get_smoothing_gain());
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}
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}
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if (fabsf(channel_throttle->norm_input()-0.5) > 0.05) { // Throttle input above 5%
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// output pilot's throttle
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attitude_control.set_throttle_out(channel_throttle->norm_input(), false, g.throttle_filt);
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// reset z targets to current values
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pos_control.relax_alt_hold_controllers(motors.get_throttle_hover());
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} else { // hold z
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if (ap.at_bottom) {
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pos_control.relax_alt_hold_controllers(motors.get_throttle_hover()); // clear velocity and position targets, and integrator
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pos_control.set_alt_target(inertial_nav.get_altitude() + 10.0f); // set target to 10 cm above bottom
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} else if (rangefinder_alt_ok()) {
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// if rangefinder is ok, use surface tracking
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float target_climb_rate = get_surface_tracking_climb_rate(0, pos_control.get_alt_target(), G_Dt);
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pos_control.set_alt_target_from_climb_rate_ff(target_climb_rate, G_Dt, false);
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}
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pos_control.update_z_controller();
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}
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motors.set_forward(channel_forward->norm_input());
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motors.set_lateral(channel_lateral->norm_input());
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}
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