/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- #pragma once #include #include #include #include #include // Inertial Navigation library // bit masks for enabled fence types. Used for TYPE parameter #define AC_FENCE_TYPE_NONE 0 // fence disabled #define AC_FENCE_TYPE_ALT_MAX 1 // high alt fence which usually initiates an RTL #define AC_FENCE_TYPE_CIRCLE 2 // circular horizontal fence (usually initiates an RTL) // valid actions should a fence be breached #define AC_FENCE_ACTION_REPORT_ONLY 0 // report to GCS that boundary has been breached but take no further action #define AC_FENCE_ACTION_RTL_AND_LAND 1 // return to launch and, if that fails, land // default boundaries #define AC_FENCE_ALT_MAX_DEFAULT 100.0f // default max altitude is 100m #define AC_FENCE_CIRCLE_RADIUS_DEFAULT 300.0f // default circular fence radius is 300m #define AC_FENCE_ALT_MAX_BACKUP_DISTANCE 20.0f // after fence is broken we recreate the fence 20m further up #define AC_FENCE_CIRCLE_RADIUS_BACKUP_DISTANCE 20.0f // after fence is broken we recreate the fence 20m further out #define AC_FENCE_MARGIN_DEFAULT 2.0f // default distance in meters that autopilot's should maintain from the fence to avoid a breach // give up distance #define AC_FENCE_GIVE_UP_DISTANCE 100.0f // distance outside the fence at which we should give up and just land. Note: this is not used by library directly but is intended to be used by the main code #define AC_FENCE_MANUAL_RECOVERY_TIME_MIN 10000 // pilot has 10seconds to recover during which time the autopilot will not attempt to re-take control class AC_Fence { public: /// Constructor AC_Fence(const AP_InertialNav& inav); /// enable - allows fence to be enabled/disabled. Note: this does not update the eeprom saved value void enable(bool true_false) { _enabled = true_false; } /// enabled - returns true if fence is enabled bool enabled() const { return _enabled; } /// get_enabled_fences - returns bitmask of enabled fences uint8_t get_enabled_fences() const; /// pre_arm_check - returns true if all pre-takeoff checks have completed successfully bool pre_arm_check() const; /// /// methods to check we are within the boundaries and recover /// /// check_fence - returns the fence type that has been breached (if any) /// curr_alt is the altitude above home in meters uint8_t check_fence(float curr_alt); // returns true if the destination is within fence (used to reject waypoints outside the fence) bool check_destination_within_fence(float dest_alt, float dest_distance_to_home); /// get_breaches - returns bit mask of the fence types that have been breached uint8_t get_breaches() const { return _breached_fences; } /// get_breach_time - returns time the fence was breached uint32_t get_breach_time() const { return _breach_time; } /// get_breach_count - returns number of times we have breached the fence uint16_t get_breach_count() const { return _breach_count; } /// get_breach_distance - returns distance in meters outside of the given fence float get_breach_distance(uint8_t fence_type) const; /// get_action - getter for user requested action on limit breach uint8_t get_action() const { return _action.get(); } /// get_safe_alt - returns maximum safe altitude (i.e. alt_max - margin) float get_safe_alt() const { return _alt_max - _margin; } /// manual_recovery_start - caller indicates that pilot is re-taking manual control so fence should be disabled for 10 seconds /// should be called whenever the pilot changes the flight mode /// has no effect if no breaches have occurred void manual_recovery_start(); /// /// time saving methods to piggy-back on main code's calculations /// /// set_home_distance - update vehicle's distance from home in meters - required for circular horizontal fence monitoring void set_home_distance(float distance) { _home_distance = distance; } static const struct AP_Param::GroupInfo var_info[]; private: /// record_breach - update breach bitmask, time and count void record_breach(uint8_t fence_type); /// clear_breach - update breach bitmask, time and count void clear_breach(uint8_t fence_type); // pointers to other objects we depend upon const AP_InertialNav& _inav; // parameters AP_Int8 _enabled; // top level enable/disable control AP_Int8 _enabled_fences; // bit mask holding which fences are enabled AP_Int8 _action; // recovery action specified by user AP_Float _alt_max; // altitude upper limit in meters AP_Float _circle_radius; // circle fence radius in meters AP_Float _margin; // distance in meters that autopilot's should maintain from the fence to avoid a breach // backup fences float _alt_max_backup; // backup altitude upper limit in meters used to refire the breach if the vehicle continues to move further away float _circle_radius_backup; // backup circle fence radius in meters used to refire the breach if the vehicle continues to move further away // breach distances float _alt_max_breach_distance; // distance above the altitude max float _circle_breach_distance; // distance beyond the circular fence // other internal variables float _home_distance; // distance from home in meters (provided by main code) // breach information uint8_t _breached_fences; // bitmask holding the fence type that was breached (i.e. AC_FENCE_TYPE_ALT_MIN, AC_FENCE_TYPE_CIRCLE) uint32_t _breach_time; // time of last breach in milliseconds uint16_t _breach_count; // number of times we have breached the fence uint32_t _manual_recovery_start_ms; // system time in milliseconds that pilot re-took manual control };