mirror of https://github.com/ArduPilot/ardupilot
76 lines
2.2 KiB
Plaintext
76 lines
2.2 KiB
Plaintext
/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
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/*
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* control_drift.pde - init and run calls for drift flight mode
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*/
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#ifndef DRIFT_SPEEDGAIN
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# define DRIFT_SPEEDGAIN 14.0
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#endif
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// drift_init - initialise drift controller
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static bool drift_init(bool ignore_checks)
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{
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if (GPS_ok() || ignore_checks) {
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return true;
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}else{
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return false;
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}
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}
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// drift_run - runs the drift controller
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// should be called at 100hz or more
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static void drift_run()
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{
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static float breaker = 0.0;
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int16_t target_roll, target_pitch;
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float target_yaw_rate;
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// if not armed or landed, set throttle to zero and exit immediately
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if(!motors.armed() || ap.land_complete) {
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attitude_control.init_targets();
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attitude_control.set_throttle_out(0, false);
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return;
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}
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// convert pilot input to lean angles
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get_pilot_desired_lean_angles(g.rc_1.control_in, g.rc_2.control_in, target_roll, target_pitch);
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// Grab inertial velocity
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Vector3f vel = inertial_nav.get_velocity();
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// rotate roll, pitch input from north facing to vehicle's perspective
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float roll_vel = vel.y * cos_yaw - vel.x * sin_yaw; // body roll vel
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float pitch_vel = vel.y * sin_yaw + vel.x * cos_yaw; // body pitch vel
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float pitch_vel2 = min(fabs(pitch_vel), 800);
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// simple gain scheduling for yaw input
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target_yaw_rate = (float)(target_roll/2) * (1.0 - (pitch_vel2 / 2400.0));
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roll_vel = constrain_float(roll_vel, -322, 322);
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pitch_vel = constrain_float(pitch_vel, -322, 322);
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// always limit roll
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target_roll = roll_vel * -DRIFT_SPEEDGAIN;
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// If we let go of sticks, bring us to a stop
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if(target_pitch == 0){
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// .14/ (.03 * 100) = 4.6 seconds till full breaking
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breaker += .03;
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breaker = min(breaker, DRIFT_SPEEDGAIN);
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target_pitch = pitch_vel * breaker;
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}else{
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breaker = 0.0;
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}
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// call attitude controller
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attitude_control.angleef_rp_rateef_y(target_roll, target_pitch, target_yaw_rate);
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// re-fetch angle targets for reporting
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const Vector3f angle_target = attitude_control.angle_ef_targets();
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control_roll = angle_target.x;
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control_pitch = angle_target.y;
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control_yaw = angle_target.z;
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}
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