Merged master

src/lib/geo/geo.h

@@ -50,7 +50,7 @@
 
 __BEGIN_DECLS
 
-#include "geo/geo_mag_declination.h"
+#include "geo_mag_declination.h"
 
 #include <stdbool.h>
 

src/modules/attitude_estimator_ekf/attitude_estimator_ekf_main.cpp

@@ -65,6 +65,7 @@
 #include <drivers/drv_hrt.h>
 
 #include <lib/mathlib/mathlib.h>
+#include <lib/geo/geo.h>
 
 #include <systemlib/systemlib.h>
 #include <systemlib/perf_counter.h>
@@ -287,6 +288,9 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 
 	float gyro_offsets[3] = { 0.0f, 0.0f, 0.0f };
 
+	/* magnetic declination, in radians */
+	float mag_decl = 0.0f;
+
 	/* rotation matrix for magnetic declination */
 	math::Matrix<3, 3> R_decl;
 	R_decl.identity();
@@ -325,9 +329,6 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 
 				/* update parameters */
 				parameters_update(&ekf_param_handles, &ekf_params);
-
-				/* update mag declination rotation matrix */
-				R_decl.from_euler(0.0f, 0.0f, ekf_params.mag_decl);
 			}
 
 			/* only run filter if sensor values changed */
@@ -340,6 +341,13 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 				orb_check(sub_gps, &gps_updated);
 				if (gps_updated) {
 					orb_copy(ORB_ID(vehicle_gps_position), sub_gps, &gps);
+
+					if (gps.eph_m < 20.0f && hrt_elapsed_time(&gps.timestamp_position) < 1000000) {
+						mag_decl = math::radians(get_mag_declination(gps.lat / 1e7f, gps.lon / 1e7f));
+
+						/* update mag declination rotation matrix */
+						R_decl.from_euler(0.0f, 0.0f, mag_decl);
+					}
 				}
 
 				bool global_pos_updated;
@@ -469,7 +477,15 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 						parameters_update(&ekf_param_handles, &ekf_params);
 
 						/* update mag declination rotation matrix */
-						R_decl.from_euler(0.0f, 0.0f, ekf_params.mag_decl);
+						if (gps.eph_m < 20.0f && hrt_elapsed_time(&gps.timestamp_position) < 1000000) {
+							mag_decl = math::radians(get_mag_declination(gps.lat / 1e7f, gps.lon / 1e7f));
+
+						} else {
+							mag_decl = ekf_params.mag_decl;
+						}
+
+						/* update mag declination rotation matrix */
+						R_decl.from_euler(0.0f, 0.0f, mag_decl);
 
 						x_aposteriori_k[0] = z_k[0];
 						x_aposteriori_k[1] = z_k[1];
@@ -515,7 +531,7 @@ const unsigned int loop_interval_alarm = 6500;	// loop interval in microseconds
 
 					att.roll = euler[0];
 					att.pitch = euler[1];
-					att.yaw = euler[2] + ekf_params.mag_decl;
+					att.yaw = euler[2] + mag_decl;
 
 					att.rollspeed = x_aposteriori[0];
 					att.pitchspeed = x_aposteriori[1];

src/modules/mavlink/mavlink_commands.cpp

@@ -40,34 +40,31 @@
 
 #include "mavlink_commands.h"
 
-MavlinkCommandsStream::MavlinkCommandsStream(Mavlink *mavlink, mavlink_channel_t channel) : _channel(channel)
+MavlinkCommandsStream::MavlinkCommandsStream(Mavlink *mavlink, mavlink_channel_t channel) : _channel(channel), _cmd_time(0)
 {
 	_cmd_sub = mavlink->add_orb_subscription(ORB_ID(vehicle_command));
-	_cmd = (struct vehicle_command_s *)_cmd_sub->get_data();
-}
-
-MavlinkCommandsStream::~MavlinkCommandsStream()
-{
 }
 
 void
 MavlinkCommandsStream::update(const hrt_abstime t)
 {
-	if (_cmd_sub->update(t)) {
+	struct vehicle_command_s cmd;
+
+	if (_cmd_sub->update(&_cmd_time, &cmd)) {
 		/* only send commands for other systems/components */
-		if (_cmd->target_system != mavlink_system.sysid || _cmd->target_component != mavlink_system.compid) {
+		if (cmd.target_system != mavlink_system.sysid || cmd.target_component != mavlink_system.compid) {
 			mavlink_msg_command_long_send(_channel,
-						      _cmd->target_system,
-						      _cmd->target_component,
-						      _cmd->command,
-						      _cmd->confirmation,
-						      _cmd->param1,
-						      _cmd->param2,
-						      _cmd->param3,
-						      _cmd->param4,
-						      _cmd->param5,
-						      _cmd->param6,
-						      _cmd->param7);
+						      cmd.target_system,
+						      cmd.target_component,
+						      cmd.command,
+						      cmd.confirmation,
+						      cmd.param1,
+						      cmd.param2,
+						      cmd.param3,
+						      cmd.param4,
+						      cmd.param5,
+						      cmd.param6,
+						      cmd.param7);
 		}
 	}
 }

src/modules/mavlink/mavlink_commands.h

@@ -55,10 +55,10 @@ private:
 	MavlinkOrbSubscription *_cmd_sub;
 	struct vehicle_command_s *_cmd;
 	mavlink_channel_t _channel;
+	uint64_t _cmd_time;
 
 public:
 	MavlinkCommandsStream(Mavlink *mavlink, mavlink_channel_t channel);
-	~MavlinkCommandsStream();
 	void update(const hrt_abstime t);
 };
 

src/modules/mavlink/mavlink_main.cpp

@@ -237,6 +237,12 @@ Mavlink::Mavlink() :
 	_subscribe_to_stream_rate(0.0f),
 	_flow_control_enabled(true),
 	_message_buffer({}),
+	_param_initialized(false),
+	_param_system_id(0),
+	_param_component_id(0),
+	_param_system_type(0),
+	_param_use_hil_gps(0),
+
 /* performance counters */
 	_loop_perf(perf_alloc(PC_ELAPSED, "mavlink_el")),
 	_txerr_perf(perf_alloc(PC_COUNT, "mavlink_txe"))
@@ -503,44 +509,39 @@ Mavlink::mavlink_dev_ioctl(struct file *filep, int cmd, unsigned long arg)
 
 void Mavlink::mavlink_update_system(void)
 {
-	static bool initialized = false;
-	static param_t param_system_id;
-	static param_t param_component_id;
-	static param_t param_system_type;
-	static param_t param_use_hil_gps;
 
-	if (!initialized) {
-		param_system_id = param_find("MAV_SYS_ID");
-		param_component_id = param_find("MAV_COMP_ID");
-		param_system_type = param_find("MAV_TYPE");
-		param_use_hil_gps = param_find("MAV_USEHILGPS");
-		initialized = true;
+	if (!_param_initialized) {
+		_param_system_id = param_find("MAV_SYS_ID");
+		_param_component_id = param_find("MAV_COMP_ID");
+		_param_system_type = param_find("MAV_TYPE");
+		_param_use_hil_gps = param_find("MAV_USEHILGPS");
+		_param_initialized = true;
 	}
 
 	/* update system and component id */
 	int32_t system_id;
-	param_get(param_system_id, &system_id);
+	param_get(_param_system_id, &system_id);
 
 	if (system_id > 0 && system_id < 255) {
 		mavlink_system.sysid = system_id;
 	}
 
 	int32_t component_id;
-	param_get(param_component_id, &component_id);
+	param_get(_param_component_id, &component_id);
 
 	if (component_id > 0 && component_id < 255) {
 		mavlink_system.compid = component_id;
 	}
 
 	int32_t system_type;
-	param_get(param_system_type, &system_type);
+	param_get(_param_system_type, &system_type);
 
 	if (system_type >= 0 && system_type < MAV_TYPE_ENUM_END) {
 		mavlink_system.type = system_type;
 	}
 
 	int32_t use_hil_gps;
-	param_get(param_use_hil_gps, &use_hil_gps);
+	param_get(_param_use_hil_gps, &use_hil_gps);
 
 	_use_hil_gps = (bool)use_hil_gps;
 }
@@ -828,7 +829,7 @@ void Mavlink::mavlink_pm_message_handler(const mavlink_channel_t chan, const mav
 
 					if (param == PARAM_INVALID) {
 						char buf[MAVLINK_MSG_STATUSTEXT_FIELD_TEXT_LEN];
-						sprintf(buf, "[mavlink pm] unknown: %s", name);
+						sprintf(buf, "[pm] unknown: %s", name);
 						mavlink_missionlib_send_gcs_string(buf);
 
 					} else {
@@ -1029,8 +1030,6 @@ void Mavlink::mavlink_wpm_send_waypoint_current(uint16_t seq)
 
 	} else {
 		mavlink_missionlib_send_gcs_string("ERROR: wp index out of bounds");
-
-		if (_verbose) { warnx("ERROR: index out of bounds"); }
 	}
 }
 
@@ -1103,8 +1102,6 @@ void Mavlink::mavlink_wpm_send_waypoint_request(uint8_t sysid, uint8_t compid, u
 
 	} else {
 		mavlink_missionlib_send_gcs_string("ERROR: Waypoint index exceeds list capacity");
-
-		if (_verbose) { warnx("ERROR: Waypoint index exceeds list capacity"); }
 	}
 }
 
@@ -1135,8 +1132,6 @@ void Mavlink::mavlink_waypoint_eventloop(uint64_t now)
 
 		mavlink_missionlib_send_gcs_string("Operation timeout");
 
-		if (_verbose) { warnx("Last operation (state=%u) timed out, changing state to MAVLINK_WPM_STATE_IDLE", _wpm->current_state); }
-
 		_wpm->current_state = MAVLINK_WPM_STATE_IDLE;
 		_wpm->current_partner_sysid = 0;
 		_wpm->current_partner_compid = 0;
@@ -1171,8 +1166,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 			} else {
 				mavlink_missionlib_send_gcs_string("REJ. WP CMD: curr partner id mismatch");
-
-				if (_verbose) { warnx("REJ. WP CMD: curr partner id mismatch"); }
 			}
 
 			break;
@@ -1196,15 +1189,10 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					} else {
 						mavlink_missionlib_send_gcs_string("IGN WP CURR CMD: Not in list");
-
-						if (_verbose) { warnx("IGN WP CURR CMD: Not in list"); }
 					}
 
 				} else {
 					mavlink_missionlib_send_gcs_string("IGN WP CURR CMD: Busy");
-
-					if (_verbose) { warnx("IGN WP CURR CMD: Busy"); }
-
 				}
 			}
 
@@ -1235,8 +1223,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 				} else {
 					mavlink_missionlib_send_gcs_string("IGN REQUEST LIST: Busy");
-
-					if (_verbose) { warnx("IGN REQUEST LIST: Busy"); }
 				}
 			}
 
@@ -1254,8 +1240,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					mavlink_missionlib_send_gcs_string("REJ. WP CMD: Req. WP not in list");
 
-					if (_verbose) { warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM_REQUEST because the requested waypoint ID (%u) was out of bounds.", wpr.seq); }
-
 					break;
 				}
 
@@ -1266,15 +1250,13 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 				if (_wpm->current_state == MAVLINK_WPM_STATE_SENDLIST) {
 
 					if (wpr.seq == 0) {
-						if (_verbose) { warnx("Got MAVLINK_MSG_ID_MISSION_ITEM_REQUEST of waypoint %u from %u changing state to MAVLINK_WPM_STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
+						if (_verbose) { warnx("Got ITEM_REQUEST of waypoint %u from %u changing to STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
 
 						_wpm->current_state = MAVLINK_WPM_STATE_SENDLIST_SENDWPS;
 
 					} else {
 						mavlink_missionlib_send_gcs_string("REJ. WP CMD: First id != 0");
 
-						if (_verbose) { warnx("REJ. WP CMD: First id != 0"); }
-
 						break;
 					}
 
@@ -1282,17 +1264,15 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					if (wpr.seq == _wpm->current_wp_id) {
 
-						if (_verbose) { warnx("Got MAVLINK_MSG_ID_MISSION_ITEM_REQUEST of waypoint %u (again) from %u staying in state MAVLINK_WPM_STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
+						if (_verbose) { warnx("Got ITEM_REQUEST of waypoint %u (again) from %u staying in STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
 
 					} else if (wpr.seq == _wpm->current_wp_id + 1) {
 
-						if (_verbose) { warnx("Got MAVLINK_MSG_ID_MISSION_ITEM_REQUEST of waypoint %u from %u staying in state MAVLINK_WPM_STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
+						if (_verbose) { warnx("Got ITEM_REQUEST of waypoint %u from %u staying in STATE_SENDLIST_SENDWPS", wpr.seq, msg->sysid); }
 
 					} else {
 						mavlink_missionlib_send_gcs_string("REJ. WP CMD: Req. WP was unexpected");
 
-						if (_verbose) { warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM_REQUEST because the requested waypoint ID (%u) was not the expected (%u or %u).", wpr.seq, _wpm->current_wp_id, _wpm->current_wp_id + 1); }
-
 						break;
 					}
 
@@ -1300,8 +1280,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					mavlink_missionlib_send_gcs_string("REJ. WP CMD: Busy");
 
-					if (_verbose) { warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM_REQUEST because i'm doing something else already (state=%i).", _wpm->current_state); }
-
 					break;
 				}
 
@@ -1315,7 +1293,7 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 				} else {
 					mavlink_wpm_send_waypoint_ack(_wpm->current_partner_sysid, _wpm->current_partner_compid, MAV_MISSION_ERROR);
 
-					if (_verbose) { warnx("ERROR: Waypoint %u out of bounds", wpr.seq); }
+					mavlink_missionlib_send_gcs_string("ERROR: Waypoint out of bounds");
 				}
 
 
@@ -1349,15 +1327,11 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 					}
 
 					if (wpc.count == 0) {
-						mavlink_missionlib_send_gcs_string("COUNT 0");
-
-						if (_verbose) { warnx("got waypoint count of 0, clearing waypoint list and staying in state MAVLINK_WPM_STATE_IDLE"); }
+						mavlink_missionlib_send_gcs_string("WP COUNT 0");
 
 						break;
 					}
 
-					if (_verbose) { warnx("Got MAVLINK_MSG_ID_MISSION_ITEM_COUNT (%u) from %u changing state to MAVLINK_WPM_STATE_GETLIST", wpc.count, msg->sysid); }
-
 					_wpm->current_state = MAVLINK_WPM_STATE_GETLIST;
 					_wpm->current_wp_id = 0;
 					_wpm->current_partner_sysid = msg->sysid;
@@ -1371,18 +1345,12 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 					if (_wpm->current_wp_id == 0) {
 						mavlink_missionlib_send_gcs_string("WP CMD OK AGAIN");
 
-						if (_verbose) { warnx("Got MAVLINK_MSG_ID_MISSION_ITEM_COUNT (%u) again from %u", wpc.count, msg->sysid); }
-
 					} else {
-						mavlink_missionlib_send_gcs_string("REJ. WP CMD: Busy");
-
-						if (_verbose) { warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM_COUNT because i'm already receiving waypoint %u.", _wpm->current_wp_id); }
+						mavlink_missionlib_send_gcs_string("REJ. WP CMD: Busy with WP");
 					}
 
 				} else {
 					mavlink_missionlib_send_gcs_string("IGN MISSION_COUNT CMD: Busy");
-
-					if (_verbose) { warnx("IGN MISSION_COUNT CMD: Busy"); }
 				}
 			}
 		}
@@ -1405,7 +1373,6 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					if (wp.seq != 0) {
 						mavlink_missionlib_send_gcs_string("Ignored MISSION_ITEM WP not 0");
-						warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM because the first waypoint ID (%u) was not 0.", wp.seq);
 						break;
 					}
 
@@ -1413,12 +1380,11 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 
 					if (wp.seq >= _wpm->current_count) {
 						mavlink_missionlib_send_gcs_string("Ignored MISSION_ITEM WP out of bounds");
-						warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM because the waypoint ID (%u) was out of bounds.", wp.seq);
 						break;
 					}
 
 					if (wp.seq != _wpm->current_wp_id) {
-						warnx("Ignored MAVLINK_MSG_ID_MISSION_ITEM because the waypoint ID (%u) was not the expected %u.", wp.seq, _wpm->current_wp_id);
+						mavlink_missionlib_send_gcs_string("IGN: waypoint ID mismatch");
 						mavlink_wpm_send_waypoint_request(_wpm->current_partner_sysid, _wpm->current_partner_compid, _wpm->current_wp_id);
 						break;
 					}
@@ -1533,11 +1499,10 @@ void Mavlink::mavlink_wpm_message_handler(const mavlink_message_t *msg)
 void
 Mavlink::mavlink_missionlib_send_message(mavlink_message_t *msg)
 {
-	uint8_t missionlib_msg_buf[MAVLINK_MAX_PACKET_LEN];
+	uint8_t buf[MAVLINK_MAX_PACKET_LEN];
 
-	uint16_t len = mavlink_msg_to_send_buffer(missionlib_msg_buf, msg);
-
-	mavlink_send_uart_bytes(_channel, missionlib_msg_buf, len);
+	uint16_t len = mavlink_msg_to_send_buffer(buf, msg);
+	mavlink_send_uart_bytes(_channel, buf, len);
 }
 
 
@@ -1620,6 +1585,7 @@ Mavlink::configure_stream(const char *stream_name, const float rate)
 	if (interval > 0) {
 		/* search for stream with specified name in supported streams list */
 		for (unsigned int i = 0; streams_list[i] != nullptr; i++) {
+
 			if (strcmp(stream_name, streams_list[i]->get_name()) == 0) {
 				/* create new instance */
 				stream = streams_list[i]->new_instance();
@@ -1925,7 +1891,7 @@ Mavlink::task_main(int argc, char *argv[])
 	/* if we are passing on mavlink messages, we need to prepare a buffer for this instance */
 	if (_passing_on) {
 		/* initialize message buffer if multiplexing is on */
-		if (OK != message_buffer_init(500)) {
+		if (OK != message_buffer_init(300)) {
 			errx(1, "can't allocate message buffer, exiting");
 		}
 
@@ -1955,9 +1921,12 @@ Mavlink::task_main(int argc, char *argv[])
 	_task_running = true;
 
 	MavlinkOrbSubscription *param_sub = add_orb_subscription(ORB_ID(parameter_update));
+	uint64_t param_time = 0;
 	MavlinkOrbSubscription *status_sub = add_orb_subscription(ORB_ID(vehicle_status));
+	uint64_t status_time = 0;
 
-	struct vehicle_status_s *status = (struct vehicle_status_s *) status_sub->get_data();
+	struct vehicle_status_s status;
+	status_sub->update(&status_time, &status);
 
 	MavlinkCommandsStream commands_stream(this, _channel);
 
@@ -2014,14 +1983,14 @@ Mavlink::task_main(int argc, char *argv[])
 
 		hrt_abstime t = hrt_absolute_time();
 
-		if (param_sub->update(t)) {
+		if (param_sub->update(&param_time, nullptr)) {
 			/* parameters updated */
 			mavlink_update_system();
 		}
 
-		if (status_sub->update(t)) {
+		if (status_sub->update(&status_time, &status)) {
 			/* switch HIL mode if required */
-			set_hil_enabled(status->hil_state == HIL_STATE_ON);
+			set_hil_enabled(status.hil_state == HIL_STATE_ON);
 		}
 
 		/* update commands stream */

src/modules/mavlink/mavlink_main.h

@@ -282,13 +282,19 @@ private:
 		int size;
 		char *data;
 	};
-	mavlink_message_buffer _message_buffer;
+	mavlink_message_buffer	_message_buffer;
 
-	pthread_mutex_t _message_buffer_mutex;
+	pthread_mutex_t		_message_buffer_mutex;
 
 	perf_counter_t	_loop_perf;			/**< loop performance counter */
 	perf_counter_t	_txerr_perf;			/**< TX error counter */
 
+	bool			_param_initialized;
+	param_t			_param_system_id;
+	param_t			_param_component_id;
+	param_t			_param_system_type;
+	param_t			_param_use_hil_gps;
+
 	/**
 	 * Send one parameter.
 	 *

src/modules/mavlink/mavlink_messages.h

@@ -43,6 +43,19 @@
 
 #include "mavlink_stream.h"
 
-extern MavlinkStream *streams_list[];
+class StreamListItem {
+
+public:
+	MavlinkStream* (*new_instance)();
+	const char* (*get_name)();
+
+	StreamListItem(MavlinkStream* (*inst)(), const char* (*name)()) :
+		new_instance(inst),
+		get_name(name) {};
+
+	~StreamListItem() {};
+};
+
+extern StreamListItem *streams_list[];
 
 #endif /* MAVLINK_MESSAGES_H_ */

src/modules/mavlink/mavlink_orb_subscription.cpp

@@ -50,50 +50,55 @@ MavlinkOrbSubscription::MavlinkOrbSubscription(const orb_id_t topic) :
 	_fd(orb_subscribe(_topic)),
 	_published(false),
 	_topic(topic),
-	_last_check(0),
 	next(nullptr)
 {
-	_data = malloc(topic->o_size);
-	memset(_data, 0, topic->o_size);
 }
 
 MavlinkOrbSubscription::~MavlinkOrbSubscription()
 {
 	close(_fd);
-	free(_data);
 }
 
 orb_id_t
-MavlinkOrbSubscription::get_topic()
+MavlinkOrbSubscription::get_topic() const
 {
 	return _topic;
 }
 
-void *
-MavlinkOrbSubscription::get_data()
-{
-	return _data;
-}
-
 bool
-MavlinkOrbSubscription::update(const hrt_abstime t)
+MavlinkOrbSubscription::update(uint64_t *time, void* data)
 {
-	if (_last_check == t) {
-		/* already checked right now, return result of the check */
-		return _updated;
+	// TODO this is NOT atomic operation, we can get data newer than time
+	// if topic was published between orb_stat and orb_copy calls.
 
-	} else {
-		_last_check = t;
-		orb_check(_fd, &_updated);
+	uint64_t time_topic;
+	if (orb_stat(_fd, &time_topic)) {
+		/* error getting last topic publication time */
+		time_topic = 0;
+	}
+
+	if (orb_copy(_topic, _fd, data)) {
+		/* error copying topic data */
+		memset(data, 0, _topic->o_size);
+		return false;
 
-		if (_updated) {
-			orb_copy(_topic, _fd, _data);
-			_published = true;
+	} else {
+		/* data copied successfully */
+		_published = true;
+		if (time_topic != *time) {
+			*time = time_topic;
 			return true;
+
+		} else {
+			return false;
 		}
 	}
+}
 
-	return false;
+bool
+MavlinkOrbSubscription::update(void* data)
+{
+	return !orb_copy(_topic, _fd, data);
 }
 
 bool

src/modules/mavlink/mavlink_orb_subscription.h

@@ -48,12 +48,26 @@
 class MavlinkOrbSubscription
 {
 public:
-	MavlinkOrbSubscription *next;	/*< pointer to next subscription in list */
+	MavlinkOrbSubscription *next;	///< pointer to next subscription in list
 
 	MavlinkOrbSubscription(const orb_id_t topic);
 	~MavlinkOrbSubscription();
 
-	bool update(const hrt_abstime t);
+	/**
+	 * Check if subscription updated and get data.
+	 *
+	 * @return true only if topic was updated and data copied to buffer successfully.
+	 * If topic was not updated since last check it will return false but still copy the data.
+	 * If no data available data buffer will be filled with zeroes.
+	 */
+	bool update(uint64_t *time, void* data);
+
+	/**
+	 * Copy topic data to given buffer.
+	 *
+	 * @return true only if topic data copied successfully.
+	 */
+	bool update(void* data);
 
 	/**
 	 * Check if the topic has been published.
@@ -62,16 +76,12 @@ public:
 	 * @return true if the topic has been published at least once.
 	 */
 	bool is_published();
-	void *get_data();
-	orb_id_t get_topic();
+	orb_id_t get_topic() const;
 
 private:
-	const orb_id_t _topic;		/*< topic metadata */
-	int _fd;					/*< subscription handle */
-	bool _published;			/*< topic was ever published */
-	void *_data;				/*< pointer to data buffer */
-	hrt_abstime _last_check;	/*< time of last check */
-	bool _updated;				/*< updated on last check */
+	const orb_id_t _topic;		///< topic metadata
+	int _fd;			///< subscription handle
+	bool _published;		///< topic was ever published
 };
 
 

src/modules/mavlink/mavlink_receiver.cpp

@@ -992,7 +992,6 @@ MavlinkReceiver::receive_start(Mavlink *parent)
 	(void)pthread_attr_setschedparam(&receiveloop_attr, &param);
 
 	pthread_attr_setstacksize(&receiveloop_attr, 2900);
-
 	pthread_t thread;
 	pthread_create(&thread, &receiveloop_attr, MavlinkReceiver::start_helper, (void *)parent);
 

src/modules/mavlink/mavlink_stream.h

@@ -50,14 +50,6 @@ class MavlinkStream;
 
 class MavlinkStream
 {
-private:
-	hrt_abstime _last_sent;
-
-protected:
-	mavlink_channel_t _channel;
-	unsigned int _interval;
-
-	virtual void send(const hrt_abstime t) = 0;
 
 public:
 	MavlinkStream *next;
@@ -71,9 +63,19 @@ public:
 	 * @return 0 if updated / sent, -1 if unchanged
 	 */
 	int update(const hrt_abstime t);
-	virtual MavlinkStream *new_instance() = 0;
+	static MavlinkStream *new_instance();
+	static const char *get_name_static();
 	virtual void subscribe(Mavlink *mavlink) = 0;
-	virtual const char *get_name() = 0;
+	virtual const char *get_name() const = 0;
+
+protected:
+	mavlink_channel_t _channel;
+	unsigned int _interval;
+
+	virtual void send(const hrt_abstime t) = 0;
+
+private:
+	hrt_abstime _last_sent;
 };