ardupilot/ArduCopter/autoyaw.cpp

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#include "Copter.h"
Mode::AutoYaw Mode::auto_yaw;
// roi_yaw - returns heading towards location held in roi
float Mode::AutoYaw::roi_yaw()
{
roi_yaw_counter++;
if (roi_yaw_counter >= 4) {
roi_yaw_counter = 0;
_roi_yaw = get_bearing_cd(copter.inertial_nav.get_position(), roi);
}
return _roi_yaw;
}
float Mode::AutoYaw::look_ahead_yaw()
{
const Vector3f& vel = copter.inertial_nav.get_velocity();
float speed = norm(vel.x,vel.y);
// Commanded Yaw to automatically look ahead.
if (copter.position_ok() && (speed > YAW_LOOK_AHEAD_MIN_SPEED)) {
_look_ahead_yaw = degrees(atan2f(vel.y,vel.x))*100.0f;
}
return _look_ahead_yaw;
}
void Mode::AutoYaw::set_mode_to_default(bool rtl)
{
set_mode(default_mode(rtl));
}
// default_mode - returns auto_yaw.mode() based on WP_YAW_BEHAVIOR parameter
// set rtl parameter to true if this is during an RTL
autopilot_yaw_mode Mode::AutoYaw::default_mode(bool rtl) const
{
switch (copter.g.wp_yaw_behavior) {
case WP_YAW_BEHAVIOR_NONE:
return AUTO_YAW_HOLD;
case WP_YAW_BEHAVIOR_LOOK_AT_NEXT_WP_EXCEPT_RTL:
if (rtl) {
return AUTO_YAW_HOLD;
} else {
return AUTO_YAW_LOOK_AT_NEXT_WP;
}
case WP_YAW_BEHAVIOR_LOOK_AHEAD:
return AUTO_YAW_LOOK_AHEAD;
case WP_YAW_BEHAVIOR_LOOK_AT_NEXT_WP:
default:
return AUTO_YAW_LOOK_AT_NEXT_WP;
}
}
// set_mode - sets the yaw mode for auto
void Mode::AutoYaw::set_mode(autopilot_yaw_mode yaw_mode)
{
// return immediately if no change
if (_mode == yaw_mode) {
return;
}
_mode = yaw_mode;
// perform initialisation
switch (_mode) {
case AUTO_YAW_LOOK_AT_NEXT_WP:
// wpnav will initialise heading when wpnav's set_destination method is called
break;
case AUTO_YAW_ROI:
// look ahead until we know otherwise
_roi_yaw = copter.ahrs.yaw_sensor;
break;
case AUTO_YAW_FIXED:
// keep heading pointing in the direction held in fixed_yaw
// caller should set the fixed_yaw
break;
case AUTO_YAW_LOOK_AHEAD:
// Commanded Yaw to automatically look ahead.
_look_ahead_yaw = copter.ahrs.yaw_sensor;
break;
case AUTO_YAW_RESETTOARMEDYAW:
// initial_armed_bearing will be set during arming so no init required
break;
case AUTO_YAW_RATE:
// initialise target yaw rate to zero
_rate_cds = 0.0f;
break;
}
}
// set_fixed_yaw - sets the yaw look at heading for auto mode
void Mode::AutoYaw::set_fixed_yaw(float angle_deg, float turn_rate_dps, int8_t direction, bool relative_angle)
{
const int32_t curr_yaw_target = copter.attitude_control->get_att_target_euler_cd().z;
// calculate final angle as relative to vehicle heading or absolute
if (!relative_angle) {
// absolute angle
_fixed_yaw = wrap_360_cd(angle_deg * 100);
} else {
// relative angle
if (direction < 0) {
angle_deg = -angle_deg;
}
_fixed_yaw = wrap_360_cd((angle_deg * 100) + curr_yaw_target);
}
// get turn speed
if (is_zero(turn_rate_dps)) {
// default to regular auto slew rate
_fixed_yaw_slewrate = AUTO_YAW_SLEW_RATE;
} else {
const int32_t turn_rate = (wrap_180_cd(_fixed_yaw - curr_yaw_target) / 100) / turn_rate_dps;
_fixed_yaw_slewrate = constrain_int32(turn_rate, 1, 360); // deg / sec
}
// set yaw mode
set_mode(AUTO_YAW_FIXED);
// TO-DO: restore support for clockwise and counter clockwise rotation held in cmd.content.yaw.direction. 1 = clockwise, -1 = counterclockwise
}
// set_roi - sets the yaw to look at roi for auto mode
void Mode::AutoYaw::set_roi(const Location &roi_location)
{
// if location is zero lat, lon and altitude turn off ROI
if (roi_location.alt == 0 && roi_location.lat == 0 && roi_location.lng == 0) {
// set auto yaw mode back to default assuming the active command is a waypoint command. A more sophisticated method is required to ensure we return to the proper yaw control for the active command
auto_yaw.set_mode_to_default(false);
#if MOUNT == ENABLED
// switch off the camera tracking if enabled
if (copter.camera_mount.get_mode() == MAV_MOUNT_MODE_GPS_POINT) {
copter.camera_mount.set_mode_to_default();
}
#endif // MOUNT == ENABLED
} else {
#if MOUNT == ENABLED
// check if mount type requires us to rotate the quad
if (!copter.camera_mount.has_pan_control()) {
if (roi_location.get_vector_from_origin_NEU(roi)) {
auto_yaw.set_mode(AUTO_YAW_ROI);
}
}
// send the command to the camera mount
copter.camera_mount.set_roi_target(roi_location);
// TO-DO: expand handling of the do_nav_roi to support all modes of the MAVLink. Currently we only handle mode 4 (see below)
// 0: do nothing
// 1: point at next waypoint
// 2: point at a waypoint taken from WP# parameter (2nd parameter?)
// 3: point at a location given by alt, lon, lat parameters
// 4: point at a target given a target id (can't be implemented)
#else
// if we have no camera mount aim the quad at the location
if (roi_location.get_vector_from_origin_NEU(roi)) {
auto_yaw.set_mode(AUTO_YAW_ROI);
}
#endif // MOUNT == ENABLED
}
}
// set auto yaw rate in centi-degrees per second
void Mode::AutoYaw::set_rate(float turn_rate_cds)
{
set_mode(AUTO_YAW_RATE);
_rate_cds = turn_rate_cds;
}
// yaw - returns target heading depending upon auto_yaw.mode()
float Mode::AutoYaw::yaw()
{
switch (_mode) {
case AUTO_YAW_ROI:
// point towards a location held in roi
return roi_yaw();
case AUTO_YAW_FIXED:
// keep heading pointing in the direction held in fixed_yaw
// with no pilot input allowed
return _fixed_yaw;
case AUTO_YAW_LOOK_AHEAD:
// Commanded Yaw to automatically look ahead.
return look_ahead_yaw();
case AUTO_YAW_RESETTOARMEDYAW:
// changes yaw to be same as when quad was armed
return copter.initial_armed_bearing;
case AUTO_YAW_LOOK_AT_NEXT_WP:
default:
// point towards next waypoint.
// we don't use wp_bearing because we don't want the copter to turn too much during flight
return copter.wp_nav->get_yaw();
}
}
// returns yaw rate normally set by SET_POSITION_TARGET mavlink
// messages (positive is clockwise, negative is counter clockwise)
float Mode::AutoYaw::rate_cds() const
{
if (_mode == AUTO_YAW_RATE) {
return _rate_cds;
}
// return zero turn rate (this should never happen)
return 0.0f;
}