Split diff pressure and airspeed.

apps/uORB/objects_common.cpp

@@ -122,6 +122,9 @@ ORB_DEFINE(optical_flow, struct optical_flow_s);
 #include "topics/omnidirectional_flow.h"
 ORB_DEFINE(omnidirectional_flow, struct omnidirectional_flow_s);
 
+#include "topics/airspeed.h"
+ORB_DEFINE(airspeed, struct airspeed_s);
+
 #include "topics/differential_pressure.h"
 ORB_DEFINE(differential_pressure, struct differential_pressure_s);
 

apps/uORB/topics/differential_pressure.h

@@ -49,16 +49,13 @@
  */
 
 /**
- * Differential pressure and airspeed
+ * Differential pressure.
  */
 struct differential_pressure_s {
 	uint64_t	timestamp;					/**< microseconds since system boot, needed to integrate */
-	float   	static_pressure_mbar;		/**< Static / environment pressure */
-	float		differential_pressure_mbar;	/**< Differential pressure reading */
-	float		temperature_celcius;		/**< ambient temperature in celcius, -1 if unknown */
-	float		indicated_airspeed_m_s;		/**< indicated airspeed in meters per second, -1 if unknown	 */
-	float		true_airspeed_m_s;			/**< true airspeed in meters per second, -1 if unknown */
-	float		voltage;					/**< Voltage from the airspeed sensor (voltage divider already compensated) */
+	float		differential_pressure_pa;	/**< Differential pressure reading */
+	float		voltage;					/**< Voltage from analog airspeed sensors (voltage divider already compensated) */
+
 };
 
 /**

apps/uORB/topics/sensor_combined.h

@@ -103,6 +103,8 @@ struct sensor_combined_s {
 	float mcu_temp_celcius;			/**< Internal temperature measurement of MCU */
 	uint32_t baro_counter;			/**< Number of raw baro measurements taken        */
 
+	float differential_pressure_pa;			/**< Airspeed sensor differential pressure                  */ 
+	uint32_t differential_pressure_counter;		/**< Number of raw differential pressure measurements taken */
 };
 
 /**