manual control setpoint: rename variables

src/modules/uORB/topics/manual_control_setpoint.h

@@ -64,11 +64,21 @@ struct manual_control_setpoint_s {
 	/**
 	 * Any of the channels may not be available and be set to NaN
 	 * to indicate that it does not contain valid data.
+	 * The variable names follow the definition of the
+	 * MANUAL_CONTROL mavlink message.
+	 * The default range is from -1 to 1 (mavlink message -1000 to 1000)
+	 * The range for the z variable is defined from 0 to 1. (The z field of
+	 * the MANUAL_CONTROL mavlink message is defined from -1000 to 1000)
 	 */
-	float roll;			 	/**< ailerons roll / roll rate input, -1..1 */
-	float pitch;			/**< elevator / pitch / pitch rate, -1..1 */
-	float yaw;				/**< rudder / yaw rate / yaw, -1..1 */
-	float throttle;			/**< throttle / collective thrust / altitude, 0..1 */
+	float x;			/**< stick position in x direction -1..1
+					  in general corresponds to forward/back motion or pitch of vehicle */
+	float y;			/**< stick position in y direction -1..1
+					  in general corresponds to right/left motion or roll of vehicle */
+	float z;			/**< throttle stick position 0..1
+					  in general corresponds to up/down motion or thrust of vehicle */
+	float r;			/**< yaw stick/twist positon, -1..1
+					  in general corresponds to rotation around the vertical
+					  (downwards) axis of the vehicle */
 	float flaps;			/**< flap position */
 	float aux1;			/**< default function: camera yaw / azimuth */
 	float aux2;			/**< default function: camera pitch / tilt */