/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- #include #include extern const AP_HAL::HAL& hal; const AP_Param::GroupInfo AC_Fence::var_info[] PROGMEM = { // @Param: ENABLE // @DisplayName: Fence enable/disable // @Description: Allows you to enable (1) or disable (0) the fence functionality // @Values: 0:Disabled,1:Enabled // @User: Standard AP_GROUPINFO("ENABLE", 0, AC_Fence, _enabled, 0), // @Param: TYPE // @DisplayName: Fence Type // @Description: Enabled fence types held as bitmask // @Values: 0:None,1:Altitude,2:Circle,3:Altitude and Circle // @User: Standard AP_GROUPINFO("TYPE", 1, AC_Fence, _enabled_fences, AC_FENCE_TYPE_ALT_MAX | AC_FENCE_TYPE_CIRCLE), // @Param: ACTION // @DisplayName: Fence Action // @Description: What action should be taken when fence is breached // @Values: 0:Report Only,1:RTL or Land // @User: Standard AP_GROUPINFO("ACTION", 2, AC_Fence, _action, AC_FENCE_ACTION_RTL_AND_LAND), // @Param: ALT_MAX // @DisplayName: Fence Maximum Altitude // @Description: Maximum altitude allowed before geofence triggers // @Units: Meters // @Range: 10 1000 // @Increment: 1 // @User: Standard AP_GROUPINFO("ALT_MAX", 3, AC_Fence, _alt_max, AC_FENCE_ALT_MAX_DEFAULT), // @Param: RADIUS // @DisplayName: Circular Fence Radius // @Description: Circle fence radius which when breached will cause an RTL // @Units: Meters // @Range: 30 10000 // @User: Standard AP_GROUPINFO("RADIUS", 4, AC_Fence, _circle_radius, AC_FENCE_CIRCLE_RADIUS_DEFAULT), // @Param: MARGIN // @DisplayName: Fence Margin // @Description: Distance that autopilot's should maintain from the fence to avoid a breach // @Units: Meters // @Range: 1 10 // @User: Standard AP_GROUPINFO("MARGIN", 5, AC_Fence, _margin, AC_FENCE_MARGIN_DEFAULT), AP_GROUPEND }; /// Default constructor. AC_Fence::AC_Fence(const AP_InertialNav* inav) : _inav(inav), _alt_max_backup(0), _circle_radius_backup(0), _alt_max_breach_distance(0), _circle_breach_distance(0), _home_distance(0), _breached_fences(AC_FENCE_TYPE_NONE), _breach_time(0), _breach_count(0), _manual_recovery_start_ms(0) { AP_Param::setup_object_defaults(this, var_info); // check for silly fence values if (_alt_max < 0.0f) { _alt_max.set_and_save(AC_FENCE_ALT_MAX_DEFAULT); } if (_circle_radius < 0) { _circle_radius.set_and_save(AC_FENCE_CIRCLE_RADIUS_DEFAULT); } } /// get_enabled_fences - returns bitmask of enabled fences uint8_t AC_Fence::get_enabled_fences() const { if (!_enabled) { return AC_FENCE_TYPE_NONE; }else{ return _enabled_fences; } } /// pre_arm_check - returns true if all pre-takeoff checks have completed successfully bool AC_Fence::pre_arm_check() const { // if not enabled or not fence set-up always return true if (!_enabled || _enabled_fences == AC_FENCE_TYPE_NONE) { return true; } // check no limits are currently breached if (_breached_fences != AC_FENCE_TYPE_NONE) { return false; } // if we have horizontal limits enabled, check inertial nav position is ok if ((_enabled_fences & AC_FENCE_TYPE_CIRCLE)!=0 && !_inav->position_ok()) { return false; } // if we got this far everything must be ok return true; } /// check_fence - returns the fence type that has been breached (if any) uint8_t AC_Fence::check_fence() { uint8_t ret = AC_FENCE_TYPE_NONE; // return immediately if disabled if (!_enabled || _enabled_fences == AC_FENCE_TYPE_NONE) { return AC_FENCE_TYPE_NONE; } // check if pilot is attempting to recover manually if (_manual_recovery_start_ms != 0) { // we ignore any fence breaches during the manual recovery period which is about 10 seconds if ((hal.scheduler->millis() - _manual_recovery_start_ms) < AC_FENCE_MANUAL_RECOVERY_TIME_MIN) { return AC_FENCE_TYPE_NONE; } else { // recovery period has passed so reset manual recovery time and continue with fence breach checks _manual_recovery_start_ms = 0; } } // get current altitude in meters float curr_alt = _inav->get_altitude() * 0.01f; // altitude fence check if ((_enabled_fences & AC_FENCE_TYPE_ALT_MAX) != 0) { // check if we are over the altitude fence if( curr_alt >= _alt_max ) { // record distance above breach _alt_max_breach_distance = curr_alt - _alt_max; // check for a new breach or a breach of the backup fence if ((_breached_fences & AC_FENCE_TYPE_ALT_MAX) == 0 || (_alt_max_backup != 0.0f && curr_alt >= _alt_max_backup)) { // record that we have breached the upper limit record_breach(AC_FENCE_TYPE_ALT_MAX); ret = ret | AC_FENCE_TYPE_ALT_MAX; // create a backup fence 20m higher up _alt_max_backup = curr_alt + AC_FENCE_ALT_MAX_BACKUP_DISTANCE; } }else{ // clear alt breach if present if ((_breached_fences & AC_FENCE_TYPE_ALT_MAX) != 0) { clear_breach(AC_FENCE_TYPE_ALT_MAX); _alt_max_backup = 0.0f; _alt_max_breach_distance = 0.0f; } } } // circle fence check if ((_enabled_fences & AC_FENCE_TYPE_CIRCLE) != 0 ) { // check if we are outside the fence if (_home_distance >= _circle_radius) { // record distance outside the fence _circle_breach_distance = _home_distance - _circle_radius; // check for a new breach or a breach of the backup fence if ((_breached_fences & AC_FENCE_TYPE_CIRCLE) == 0 || (_circle_radius_backup != 0.0f && _home_distance >= _circle_radius_backup)) { // record that we have breached the circular distance limit record_breach(AC_FENCE_TYPE_CIRCLE); ret = ret | AC_FENCE_TYPE_CIRCLE; // create a backup fence 20m further out _circle_radius_backup = _home_distance + AC_FENCE_CIRCLE_RADIUS_BACKUP_DISTANCE; } }else{ // clear circle breach if present if ((_breached_fences & AC_FENCE_TYPE_CIRCLE) != 0) { clear_breach(AC_FENCE_TYPE_CIRCLE); _circle_radius_backup = 0.0f; _circle_breach_distance = 0.0f; } } } // return any new breaches that have occurred return ret; // To-Do: add min alt and polygon check //outside = Polygon_outside(location, &geofence_state->boundary[1], geofence_state->num_points-1); } /// record_breach - update breach bitmask, time and count void AC_Fence::record_breach(uint8_t fence_type) { // if we haven't already breached a limit, update the breach time if (_breached_fences == AC_FENCE_TYPE_NONE) { _breach_time = hal.scheduler->millis(); } // update breach count if (_breach_count < 65500) { _breach_count++; } // update bitmask _breached_fences |= fence_type; } /// clear_breach - update breach bitmask, time and count void AC_Fence::clear_breach(uint8_t fence_type) { // return immediately if this fence type was not breached if ((_breached_fences & fence_type) == 0) { return; } // update bitmask _breached_fences &= ~fence_type; } /// get_breach_distance - returns distance in meters outside of the given fence float AC_Fence::get_breach_distance(uint8_t fence_type) const { switch (fence_type) { case AC_FENCE_TYPE_ALT_MAX: return _alt_max_breach_distance; break; case AC_FENCE_TYPE_CIRCLE: return _circle_breach_distance; break; case AC_FENCE_TYPE_ALT_MAX | AC_FENCE_TYPE_CIRCLE: return max(_alt_max_breach_distance,_circle_breach_distance); } // we don't recognise the fence type so just return 0 return 0; } /// manual_recovery_start - caller indicates that pilot is re-taking manual control so fence should be disabled for 10 seconds /// has no effect if no breaches have occurred void AC_Fence::manual_recovery_start() { // return immediate if we haven't breached a fence if (_breached_fences == AC_FENCE_TYPE_NONE) { return; } // record time pilot began manual recovery _manual_recovery_start_ms = hal.scheduler->millis(); }