mission feasibility checker: add check for waypoint altitude relative to home position altitude

src/modules/navigator/mission_feasibility_checker.cpp

@@ -62,7 +62,7 @@ MissionFeasibilityChecker::MissionFeasibilityChecker() : _mavlink_fd(-1), _capab
 }
 
 
-bool MissionFeasibilityChecker::checkMissionFeasible(bool isRotarywing, dm_item_t dm_current, size_t nMissionItems, Geofence &geofence)
+bool MissionFeasibilityChecker::checkMissionFeasible(bool isRotarywing, dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt)
 {
 	/* Init if not done yet */
 	init();
@@ -75,24 +75,24 @@ bool MissionFeasibilityChecker::checkMissionFeasible(bool isRotarywing, dm_item_
 
 
 	if (isRotarywing)
-		return checkMissionFeasibleRotarywing(dm_current, nMissionItems, geofence);
+		return checkMissionFeasibleRotarywing(dm_current, nMissionItems, geofence, home_alt);
 	else
-		return checkMissionFeasibleFixedwing(dm_current, nMissionItems, geofence);
+		return checkMissionFeasibleFixedwing(dm_current, nMissionItems, geofence, home_alt);
 }
 
-bool MissionFeasibilityChecker::checkMissionFeasibleRotarywing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence)
+bool MissionFeasibilityChecker::checkMissionFeasibleRotarywing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt)
 {
 
-	return checkGeofence(dm_current, nMissionItems, geofence);
+	return  (checkGeofence(dm_current, nMissionItems, geofence) && checkHomePositionAltitude(dm_current, nMissionItems, home_alt));
 }
 
-bool MissionFeasibilityChecker::checkMissionFeasibleFixedwing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence)
+bool MissionFeasibilityChecker::checkMissionFeasibleFixedwing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt)
 {
 	/* Update fixed wing navigation capabilites */
 	updateNavigationCapabilities();
 //	warnx("_nav_caps.landing_slope_angle_rad %.4f, _nav_caps.landing_horizontal_slope_displacement %.4f", _nav_caps.landing_slope_angle_rad, _nav_caps.landing_horizontal_slope_displacement);
 
-	return (checkFixedWingLanding(dm_current, nMissionItems) && checkGeofence(dm_current, nMissionItems, geofence));
+	return (checkFixedWingLanding(dm_current, nMissionItems) && checkGeofence(dm_current, nMissionItems, geofence) && checkHomePositionAltitude(dm_current, nMissionItems, home_alt));
 }
 
 bool MissionFeasibilityChecker::checkGeofence(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence)
@@ -108,7 +108,7 @@ bool MissionFeasibilityChecker::checkGeofence(dm_item_t dm_current, size_t nMiss
 				return false;
 			}
 
-			if (!geofence.inside(missionitem.lat, missionitem.lon, missionitem.altitude)) { //xxx: handle relative altitude
+			if (!geofence.inside(missionitem.lat, missionitem.lon, missionitem.altitude)) {
 				mavlink_log_info(_mavlink_fd, "#audio: Geofence violation waypoint %d", i);
 				return false;
 			}
@@ -118,6 +118,33 @@ bool MissionFeasibilityChecker::checkGeofence(dm_item_t dm_current, size_t nMiss
 	return true;
 }
 
+bool MissionFeasibilityChecker::checkHomePositionAltitude(dm_item_t dm_current, size_t nMissionItems, float home_alt, bool throw_error)
+{
+	/* Check if all all waypoints are above the home altitude, only return false if bool throw_error = true */
+	for (size_t i = 0; i < nMissionItems; i++) {
+		static struct mission_item_s missionitem;
+		const ssize_t len = sizeof(struct mission_item_s);
+
+		if (dm_read(dm_current, i, &missionitem, len) != len) {
+			/* not supposed to happen unless the datamanager can't access the SD card, etc. */
+			if (throw_error) {
+				return false;
+			} else	{
+				return true;
+			}
+		}
+
+		if (home_alt > missionitem.altitude) {
+			mavlink_log_info(_mavlink_fd, "#audio: warning waypoint %d below home", i);
+			if (throw_error) {
+				return false;
+			} else	{
+				return true;
+			}
+		}
+	}
+}
+
 bool MissionFeasibilityChecker::checkFixedWingLanding(dm_item_t dm_current, size_t nMissionItems)
 {
 	/* Go through all mission items and search for a landing waypoint

src/modules/navigator/mission_feasibility_checker.h

@@ -59,14 +59,15 @@ private:
 
 	/* Checks for all airframes */
 	bool checkGeofence(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence);
+	bool checkHomePositionAltitude(dm_item_t dm_current, size_t nMissionItems, float home_alt, bool throw_error = false);
 
 	/* Checks specific to fixedwing airframes */
-	bool checkMissionFeasibleFixedwing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence);
+	bool checkMissionFeasibleFixedwing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt);
 	bool checkFixedWingLanding(dm_item_t dm_current, size_t nMissionItems);
 	void updateNavigationCapabilities();
 
 	/* Checks specific to rotarywing airframes */
-	bool checkMissionFeasibleRotarywing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence);
+	bool checkMissionFeasibleRotarywing(dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt);
 public:
 
 	MissionFeasibilityChecker();
@@ -75,7 +76,7 @@ public:
 	/*
 	 * Returns true if mission is feasible and false otherwise
 	 */
-	bool checkMissionFeasible(bool isRotarywing, dm_item_t dm_current, size_t nMissionItems, Geofence &geofence);
+	bool checkMissionFeasible(bool isRotarywing, dm_item_t dm_current, size_t nMissionItems, Geofence &geofence, float home_alt);
 
 };
 

src/modules/navigator/navigator_main.cpp

@@ -521,7 +521,7 @@ Navigator::offboard_mission_update(bool isrotaryWing)
 			dm_current = DM_KEY_WAYPOINTS_OFFBOARD_1;
 		}
 
-		missionFeasiblityChecker.checkMissionFeasible(isrotaryWing, dm_current, (size_t)offboard_mission.count, _geofence);
+		missionFeasiblityChecker.checkMissionFeasible(isrotaryWing, dm_current, (size_t)offboard_mission.count, _geofence, _home_pos.alt);
 
 		_mission.set_offboard_dataman_id(offboard_mission.dataman_id);
 		_mission.set_current_offboard_mission_index(offboard_mission.current_index);