Rover: updates for new AP_Baro API

APMrover2/APMrover2.pde

@@ -201,21 +201,7 @@ static AP_GPS gps;
 // flight modes convenience array
 static AP_Int8		*modes = &g.mode1;
 
-#if CONFIG_BARO == HAL_BARO_BMP085
-static AP_Baro_BMP085 barometer;
-#elif CONFIG_BARO == HAL_BARO_PX4
-static AP_Baro_PX4 barometer;
-#elif CONFIG_BARO == HAL_BARO_VRBRAIN
-static AP_Baro_VRBRAIN barometer;
-#elif CONFIG_BARO == HAL_BARO_HIL
-static AP_Baro_HIL barometer;
-#elif CONFIG_BARO == HAL_BARO_MS5611
-static AP_Baro_MS5611 barometer(&AP_Baro_MS5611::i2c);
-#elif CONFIG_BARO == HAL_BARO_MS5611_SPI
-static AP_Baro_MS5611 barometer(&AP_Baro_MS5611::spi);
-#else
- #error Unrecognized CONFIG_BARO setting
-#endif
+static AP_Baro barometer;
 
 #if CONFIG_COMPASS == HAL_COMPASS_PX4
 static AP_Compass_PX4 compass;
@@ -639,7 +625,7 @@ static void mount_update(void)
 
 static void update_alt()
 {
-    barometer.read();
+    barometer.update();
     if (should_log(MASK_LOG_IMU)) {
         Log_Write_Baro();
     }