mirror of https://github.com/ArduPilot/ardupilot
612 lines
18 KiB
C++
612 lines
18 KiB
C++
#include <AP_HAL/AP_HAL.h>
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#include "AC_Fence.h"
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#include <GCS_MAVLink/GCS_MAVLink.h>
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#include <GCS_MAVLink/GCS.h>
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extern const AP_HAL::HAL& hal;
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const AP_Param::GroupInfo AC_Fence::var_info[] = {
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// @Param: ENABLE
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// @DisplayName: Fence enable/disable
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// @Description: Allows you to enable (1) or disable (0) the fence functionality
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// @Values: 0:Disabled,1:Enabled
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// @User: Standard
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AP_GROUPINFO("ENABLE", 0, AC_Fence, _enabled, 0),
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// @Param: TYPE
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// @DisplayName: Fence Type
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// @Description: Enabled fence types held as bitmask
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// @Values: 0:None,1:Altitude,2:Circle,3:Altitude and Circle,4:Polygon,5:Altitude and Polygon,6:Circle and Polygon,7:All
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// @Bitmask: 0:Altitude,1:Circle,2:Polygon
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// @User: Standard
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AP_GROUPINFO("TYPE", 1, AC_Fence, _enabled_fences, AC_FENCE_TYPE_ALT_MAX | AC_FENCE_TYPE_CIRCLE | AC_FENCE_TYPE_POLYGON),
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// @Param: ACTION
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// @DisplayName: Fence Action
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// @Description: What action should be taken when fence is breached
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// @Values: 0:Report Only,1:RTL or Land, 2:Always land
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// @User: Standard
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AP_GROUPINFO("ACTION", 2, AC_Fence, _action, AC_FENCE_ACTION_RTL_AND_LAND),
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// @Param: ALT_MAX
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// @DisplayName: Fence Maximum Altitude
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// @Description: Maximum altitude allowed before geofence triggers
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// @Units: m
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// @Range: 10 1000
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// @Increment: 1
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// @User: Standard
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AP_GROUPINFO_FRAME("ALT_MAX", 3, AC_Fence, _alt_max, AC_FENCE_ALT_MAX_DEFAULT, AP_PARAM_FRAME_COPTER | AP_PARAM_FRAME_SUB | AP_PARAM_FRAME_TRICOPTER | AP_PARAM_FRAME_HELI),
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// @Param: RADIUS
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// @DisplayName: Circular Fence Radius
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// @Description: Circle fence radius which when breached will cause an RTL
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// @Units: m
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// @Range: 30 10000
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// @User: Standard
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AP_GROUPINFO("RADIUS", 4, AC_Fence, _circle_radius, AC_FENCE_CIRCLE_RADIUS_DEFAULT),
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// @Param: MARGIN
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// @DisplayName: Fence Margin
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// @Description: Distance that autopilot's should maintain from the fence to avoid a breach
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// @Units: m
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// @Range: 1 10
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// @User: Standard
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AP_GROUPINFO("MARGIN", 5, AC_Fence, _margin, AC_FENCE_MARGIN_DEFAULT),
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// @Param: TOTAL
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// @DisplayName: Fence polygon point total
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// @Description: Number of polygon points saved in eeprom (do not update manually)
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// @Range: 1 20
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// @User: Standard
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AP_GROUPINFO("TOTAL", 6, AC_Fence, _total, 0),
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// @Param: ALT_MIN
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// @DisplayName: Fence Minimum Altitude
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// @Description: Minimum altitude allowed before geofence triggers
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// @Units: m
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// @Range: -100 100
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// @Increment: 1
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// @User: Standard
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AP_GROUPINFO_FRAME("ALT_MIN", 7, AC_Fence, _alt_min, AC_FENCE_ALT_MIN_DEFAULT, AP_PARAM_FRAME_SUB),
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AP_GROUPEND
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};
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/// Default constructor.
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AC_Fence::AC_Fence(const AP_AHRS_NavEKF& ahrs) :
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_ahrs(ahrs)
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{
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AP_Param::setup_object_defaults(this, var_info);
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}
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void AC_Fence::enable(bool value)
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{
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_enabled = value;
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if (!value) {
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clear_breach(AC_FENCE_TYPE_ALT_MAX | AC_FENCE_TYPE_CIRCLE | AC_FENCE_TYPE_POLYGON);
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}
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}
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/// get_enabled_fences - returns bitmask of enabled fences
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uint8_t AC_Fence::get_enabled_fences() const
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{
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if (!_enabled) {
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return 0;
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}
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return _enabled_fences;
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}
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// additional checks for the polygon fence:
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bool AC_Fence::pre_arm_check_polygon(const char* &fail_msg) const
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{
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if (!(_enabled_fences & AC_FENCE_TYPE_POLYGON)) {
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// not enabled; all good
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return true;
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}
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if (!_boundary_valid) {
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fail_msg = "Polygon boundary invalid";
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return false;
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}
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return true;
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}
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// additional checks for the circle fence:
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bool AC_Fence::pre_arm_check_circle(const char* &fail_msg) const
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{
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if (_circle_radius < 0) {
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fail_msg = "Invalid FENCE_RADIUS value";
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return false;
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}
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return true;
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}
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// additional checks for the alt fence:
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bool AC_Fence::pre_arm_check_alt(const char* &fail_msg) const
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{
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if (_alt_max < 0.0f) {
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fail_msg = "Invalid FENCE_ALT_MAX value";
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return false;
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}
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return true;
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}
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/// pre_arm_check - returns true if all pre-takeoff checks have completed successfully
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bool AC_Fence::pre_arm_check(const char* &fail_msg) const
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{
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fail_msg = nullptr;
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// if not enabled or not fence set-up always return true
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if (!_enabled || !_enabled_fences) {
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return true;
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}
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// check no limits are currently breached
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if (_breached_fences) {
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fail_msg = "vehicle outside fence";
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return false;
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}
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// if we have horizontal limits enabled, check we can get a
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// relative position from the EKF
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if ((_enabled_fences & AC_FENCE_TYPE_CIRCLE) ||
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(_enabled_fences & AC_FENCE_TYPE_POLYGON)) {
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Vector2f position;
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if (!_ahrs.get_relative_position_NE_home(position)) {
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fail_msg = "fence requires position";
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return false;
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}
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}
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if (!pre_arm_check_polygon(fail_msg)) {
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return false;
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}
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if (!pre_arm_check_circle(fail_msg)) {
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return false;
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}
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if (!pre_arm_check_alt(fail_msg)) {
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return false;
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}
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// if we got this far everything must be ok
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return true;
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}
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bool AC_Fence::check_fence_alt_max()
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{
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// altitude fence check
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if (!(_enabled_fences & AC_FENCE_TYPE_ALT_MAX)) {
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// not enabled; no breach
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return false;
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}
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_ahrs.get_relative_position_D_home(_curr_alt);
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_curr_alt = -_curr_alt; // translate Down to Up
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// check if we are over the altitude fence
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if(_curr_alt >= _alt_max) {
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// record distance above breach
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_alt_max_breach_distance = _curr_alt - _alt_max;
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// check for a new breach or a breach of the backup fence
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if (!(_breached_fences & AC_FENCE_TYPE_ALT_MAX) ||
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(!is_zero(_alt_max_backup) && _curr_alt >= _alt_max_backup)) {
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// new breach
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record_breach(AC_FENCE_TYPE_ALT_MAX);
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// create a backup fence 20m higher up
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_alt_max_backup = _curr_alt + AC_FENCE_ALT_MAX_BACKUP_DISTANCE;
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// new breach:
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return true;
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}
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// old breach:
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return false;
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}
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// not breached
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// clear alt breach if present
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if ((_breached_fences & AC_FENCE_TYPE_ALT_MAX) != 0) {
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clear_breach(AC_FENCE_TYPE_ALT_MAX);
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_alt_max_backup = 0.0f;
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_alt_max_breach_distance = 0.0f;
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}
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return false;
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}
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// check_fence_polygon - returns true if the polygon fence is freshly breached
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bool AC_Fence::check_fence_polygon()
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{
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if (!(_enabled_fences & AC_FENCE_TYPE_POLYGON)) {
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// not enabled; no breach
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return false;
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}
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// check consistency of number of points
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if (_boundary_num_points != _total) {
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// Fence is currently not completely loaded. Can't breach it?!
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_boundary_loaded = false;
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load_polygon_from_eeprom();
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return false;
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}
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if (!_boundary_valid) {
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// fence isn't valid - can't breach it?!
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return false;
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}
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// check if vehicle is outside the polygon fence
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Vector2f position;
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if (!_ahrs.get_relative_position_NE_origin(position)) {
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// we have no idea where we are; can't breach the fence
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return false;
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}
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position = position * 100.0f; // m to cm
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if (_poly_loader.boundary_breached(position, _boundary_num_points, _boundary, true)) {
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// check if this is a new breach
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if (_breached_fences & AC_FENCE_TYPE_POLYGON) {
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// not a new breach
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return false;
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}
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// record that we have breached the polygon
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record_breach(AC_FENCE_TYPE_POLYGON);
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return true;
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}
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// inside boundary; clear breach if present
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if (_breached_fences & AC_FENCE_TYPE_POLYGON) {
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clear_breach(AC_FENCE_TYPE_POLYGON);
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}
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return false;
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}
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bool AC_Fence::check_fence_circle()
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{
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if (!(_enabled_fences & AC_FENCE_TYPE_CIRCLE)) {
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// not enabled; no breach
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return false;
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}
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Vector2f home;
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if (_ahrs.get_relative_position_NE_home(home)) {
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// we (may) remain breached if we can't update home
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_home_distance = home.length();
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}
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// check if we are outside the fence
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if (_home_distance >= _circle_radius) {
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// record distance outside the fence
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_circle_breach_distance = _home_distance - _circle_radius;
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// check for a new breach or a breach of the backup fence
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if (!(_breached_fences & AC_FENCE_TYPE_CIRCLE) ||
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(!is_zero(_circle_radius_backup) && _home_distance >= _circle_radius_backup)) {
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// new breach
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// create a backup fence 20m further out
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record_breach(AC_FENCE_TYPE_CIRCLE);
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_circle_radius_backup = _home_distance + AC_FENCE_CIRCLE_RADIUS_BACKUP_DISTANCE;
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return true;
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}
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return false;
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}
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// not currently breached
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// clear circle breach if present
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if (_breached_fences & AC_FENCE_TYPE_CIRCLE) {
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clear_breach(AC_FENCE_TYPE_CIRCLE);
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_circle_radius_backup = 0.0f;
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_circle_breach_distance = 0.0f;
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}
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return false;
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}
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/// check - returns bitmask of fence types breached (if any)
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uint8_t AC_Fence::check()
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{
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uint8_t ret = 0;
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// return immediately if disabled
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if (!_enabled || !_enabled_fences) {
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return 0;
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}
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// check if pilot is attempting to recover manually
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if (_manual_recovery_start_ms != 0) {
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// we ignore any fence breaches during the manual recovery period which is about 10 seconds
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if ((AP_HAL::millis() - _manual_recovery_start_ms) < AC_FENCE_MANUAL_RECOVERY_TIME_MIN) {
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return 0;
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}
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// recovery period has passed so reset manual recovery time
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// and continue with fence breach checks
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_manual_recovery_start_ms = 0;
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}
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// maximum altitude fence check
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if (check_fence_alt_max()) {
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ret |= AC_FENCE_TYPE_ALT_MAX;
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}
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// circle fence check
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if (check_fence_circle()) {
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ret |= AC_FENCE_TYPE_CIRCLE;
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}
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// polygon fence check
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if (check_fence_polygon()) {
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ret |= AC_FENCE_TYPE_POLYGON;
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}
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// return any new breaches that have occurred
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return ret;
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}
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// returns true if the destination is within fence (used to reject waypoints outside the fence)
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bool AC_Fence::check_destination_within_fence(const Location_Class& loc)
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{
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// Altitude fence check
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if ((get_enabled_fences() & AC_FENCE_TYPE_ALT_MAX)) {
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int32_t alt_above_home_cm;
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if (loc.get_alt_cm(Location_Class::ALT_FRAME_ABOVE_HOME, alt_above_home_cm)) {
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if ((alt_above_home_cm * 0.01f) > _alt_max) {
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return false;
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}
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}
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}
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// Circular fence check
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if ((get_enabled_fences() & AC_FENCE_TYPE_CIRCLE)) {
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if ((get_distance_cm(_ahrs.get_home(), loc) * 0.01f) > _circle_radius) {
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return false;
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}
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}
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// polygon fence check
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if ((get_enabled_fences() & AC_FENCE_TYPE_POLYGON) && _boundary_num_points > 0) {
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// check ekf has a good location
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Vector2f posNE;
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if (loc.get_vector_xy_from_origin_NE(posNE)) {
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if (_poly_loader.boundary_breached(posNE, _boundary_num_points, _boundary, true)) {
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return false;
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}
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}
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}
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return true;
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}
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/// record_breach - update breach bitmask, time and count
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void AC_Fence::record_breach(uint8_t fence_type)
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{
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// if we haven't already breached a limit, update the breach time
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if (!_breached_fences) {
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_breach_time = AP_HAL::millis();
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}
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// update breach count
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if (_breach_count < 65500) {
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_breach_count++;
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}
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// update bitmask
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_breached_fences |= fence_type;
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}
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/// clear_breach - update breach bitmask, time and count
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void AC_Fence::clear_breach(uint8_t fence_type)
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{
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// return immediately if this fence type was not breached
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if ((_breached_fences & fence_type) == 0) {
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return;
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}
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// update bitmask
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_breached_fences &= ~fence_type;
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}
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/// get_breach_distance - returns distance in meters outside of the given fence
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float AC_Fence::get_breach_distance(uint8_t fence_type) const
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{
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switch (fence_type) {
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case AC_FENCE_TYPE_ALT_MAX:
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return _alt_max_breach_distance;
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break;
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case AC_FENCE_TYPE_CIRCLE:
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return _circle_breach_distance;
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break;
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case AC_FENCE_TYPE_ALT_MAX | AC_FENCE_TYPE_CIRCLE:
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return MAX(_alt_max_breach_distance,_circle_breach_distance);
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}
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// we don't recognise the fence type so just return 0
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return 0;
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}
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/// manual_recovery_start - caller indicates that pilot is re-taking manual control so fence should be disabled for 10 seconds
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/// has no effect if no breaches have occurred
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void AC_Fence::manual_recovery_start()
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{
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// return immediate if we haven't breached a fence
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if (!_breached_fences) {
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return;
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}
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// record time pilot began manual recovery
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_manual_recovery_start_ms = AP_HAL::millis();
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}
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/// returns pointer to array of polygon points and num_points is filled in with the total number
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Vector2f* AC_Fence::get_polygon_points(uint16_t& num_points) const
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{
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num_points = _boundary_num_points;
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return _boundary;
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}
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/// returns true if we've breached the polygon boundary. simple passthrough to underlying _poly_loader object
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bool AC_Fence::boundary_breached(const Vector2f& location, uint16_t num_points, const Vector2f* points) const
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{
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return _poly_loader.boundary_breached(location, num_points, points, true);
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}
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/// handler for polygon fence messages with GCS
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void AC_Fence::handle_msg(GCS_MAVLINK &link, mavlink_message_t* msg)
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{
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// exit immediately if null message
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if (msg == nullptr) {
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return;
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}
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switch (msg->msgid) {
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// receive a fence point from GCS and store in EEPROM
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case MAVLINK_MSG_ID_FENCE_POINT: {
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mavlink_fence_point_t packet;
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mavlink_msg_fence_point_decode(msg, &packet);
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if (!check_latlng(packet.lat,packet.lng)) {
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link.send_text(MAV_SEVERITY_WARNING, "Invalid fence point, lat or lng too large");
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} else {
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Vector2l point;
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point.x = packet.lat*1.0e7f;
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point.y = packet.lng*1.0e7f;
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if (!_poly_loader.save_point_to_eeprom(packet.idx, point)) {
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link.send_text(MAV_SEVERITY_WARNING, "Failed to save polygon point, too many points?");
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} else {
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// trigger reload of points
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_boundary_loaded = false;
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}
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}
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break;
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}
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// send a fence point to GCS
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case MAVLINK_MSG_ID_FENCE_FETCH_POINT: {
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mavlink_fence_fetch_point_t packet;
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mavlink_msg_fence_fetch_point_decode(msg, &packet);
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// attempt to retrieve from eeprom
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Vector2l point;
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if (_poly_loader.load_point_from_eeprom(packet.idx, point)) {
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mavlink_msg_fence_point_send_buf(msg, link.get_chan(), msg->sysid, msg->compid, packet.idx, _total, point.x*1.0e-7f, point.y*1.0e-7f);
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} else {
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link.send_text(MAV_SEVERITY_WARNING, "Bad fence point");
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}
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break;
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}
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default:
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// do nothing
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break;
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}
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}
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/// load polygon points stored in eeprom into boundary array and perform validation
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bool AC_Fence::load_polygon_from_eeprom(bool force_reload)
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|
{
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// exit immediately if already loaded
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if (_boundary_loaded && !force_reload) {
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|
return true;
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|
}
|
|
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// check if we need to create array
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|
if (!_boundary_create_attempted) {
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_boundary = (Vector2f *)_poly_loader.create_point_array(sizeof(Vector2f));
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_boundary_create_attempted = true;
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|
}
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|
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|
// exit if we could not allocate RAM for the boundary
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|
if (_boundary == nullptr) {
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|
return false;
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|
}
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|
|
|
// get current location from EKF
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Location temp_loc;
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if (!_ahrs.get_location(temp_loc)) {
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|
return false;
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|
}
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struct Location ekf_origin {};
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|
_ahrs.get_origin(ekf_origin);
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|
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|
// sanity check total
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|
_total = constrain_int16(_total, 0, _poly_loader.max_points());
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|
|
|
// load each point from eeprom
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|
Vector2l temp_latlon;
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|
for (uint16_t index=0; index<_total; index++) {
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|
// load boundary point as lat/lon point
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|
_poly_loader.load_point_from_eeprom(index, temp_latlon);
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|
// move into location structure and convert to offset from ekf origin
|
|
temp_loc.lat = temp_latlon.x;
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|
temp_loc.lng = temp_latlon.y;
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|
_boundary[index] = location_diff(ekf_origin, temp_loc) * 100.0f;
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|
}
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|
_boundary_num_points = _total;
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|
_boundary_loaded = true;
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|
|
|
// update validity of polygon
|
|
_boundary_valid = _poly_loader.boundary_valid(_boundary_num_points, _boundary, true);
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|
|
|
return true;
|
|
}
|
|
|
|
// methods for mavlink SYS_STATUS message (send_extended_status1)
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|
bool AC_Fence::sys_status_present() const
|
|
{
|
|
return _enabled;
|
|
}
|
|
|
|
bool AC_Fence::sys_status_enabled() const
|
|
{
|
|
if (!sys_status_present()) {
|
|
return false;
|
|
}
|
|
if (_action == AC_FENCE_ACTION_REPORT_ONLY) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool AC_Fence::sys_status_failed() const
|
|
{
|
|
if (!sys_status_present()) {
|
|
// not failed if not present; can fail if present but not enabled
|
|
return false;
|
|
}
|
|
if (get_breaches() != 0) {
|
|
return true;
|
|
}
|
|
if (_enabled_fences & AC_FENCE_TYPE_POLYGON) {
|
|
if (!_boundary_valid) {
|
|
return true;
|
|
}
|
|
}
|
|
if (_enabled_fences & AC_FENCE_TYPE_CIRCLE) {
|
|
if (_circle_radius < 0) {
|
|
return true;
|
|
}
|
|
}
|
|
if (_enabled_fences & AC_FENCE_TYPE_ALT_MAX) {
|
|
if (_alt_max < 0.0f) {
|
|
return true;
|
|
}
|
|
}
|
|
if ((_enabled_fences & AC_FENCE_TYPE_CIRCLE) ||
|
|
(_enabled_fences & AC_FENCE_TYPE_POLYGON)) {
|
|
Vector2f position;
|
|
if (!_ahrs.get_relative_position_NE_home(position)) {
|
|
// both these fence types require position
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|