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diff --git a/apps/systemlib/conversions.h b/apps/systemlib/conversions.h
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--- a/apps/systemlib/conversions.h
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-/****************************************************************************
- *
- *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
- *   Author: Lorenz Meier <lm@inf.ethz.ch>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- * 3. Neither the name PX4 nor the names of its contributors may be
- *    used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
-
-/**
- * @file conversions.h
- * Definition of commonly used conversions.
- *
- * Includes bit / byte / geo representation and unit conversions.
- */
-
-#ifndef CONVERSIONS_H_
-#define CONVERSIONS_H_
-#include <float.h>
-#include <stdint.h>
-
-#define CONSTANTS_ONE_G						9.80665f		// m/s^2
-#define CONSTANTS_AIR_DENSITY_SEA_LEVEL_15C	1.225f			// kg/m^3
-#define CONSTANTS_AIR_GAS_CONST				287.1f 			// J/(kg * K)
-#define CONSTANTS_ABSOLUTE_NULL_CELSIUS		-273.15f		// °C
-
-__BEGIN_DECLS
-
-/**
- * Converts a signed 16 bit integer from big endian to little endian.
- *
- * This function is for commonly used 16 bit big endian sensor data,
- * delivered by driver routines as two 8 bit numbers in big endian order.
- * Common vendors with big endian representation are Invense, Bosch and
- * Honeywell. ST micro devices tend to use a little endian representation.
- */
-__EXPORT int16_t int16_t_from_bytes(uint8_t bytes[]);
-
-/**
- * Converts a 3 x 3 rotation matrix to an unit quaternion.
- *
- * All orientations are expressed in NED frame.
- *
- * @param R rotation matrix to convert
- * @param Q quaternion to write back to
- */
-__EXPORT void rot2quat(const float R[9], float Q[4]);
-
-/**
- * Converts an unit quaternion to a 3 x 3 rotation matrix.
- *
- * All orientations are expressed in NED frame.
- *
- * @param Q quaternion to convert
- * @param R rotation matrix to write back to
- */
-__EXPORT void quat2rot(const float Q[4], float R[9]);
-
-/**
- * Calculates air density.
- *
- * @param static_pressure ambient pressure in millibar
- * @param temperature_celcius air / ambient temperature in celcius
- */
-__EXPORT float get_air_density(float static_pressure, float temperature_celsius);
-
-__END_DECLS
-
-#endif /* CONVERSIONS_H_ */