sensirion_common.h

/*
 * Copyright (c) 2018, Sensirion AG
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * 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.
 *
 * * Neither the name of Sensirion AG 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 HOLDER 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.
 */

#ifndef SENSIRION_COMMON_H
#define SENSIRION_COMMON_H

#include "sensirion_config.h"

#ifdef __cplusplus
extern "C" {
#endif

#define NO_ERROR 0
#define NOT_IMPLEMENTED_ERROR 31

#ifndef ARRAY_SIZE
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
#endif

#define SENSIRION_COMMAND_SIZE 2
#define SENSIRION_WORD_SIZE 2
#define SENSIRION_NUM_WORDS(x) (sizeof(x) / SENSIRION_WORD_SIZE)
#define SENSIRION_MAX_BUFFER_WORDS 32

/**
 * sensirion_common_bytes_to_int16_t() - Convert an array of bytes to an int16_t
 *
 * Convert an array of bytes received from the sensor in big-endian/MSB-first
 * format to an int16_t value in the correct system-endianness.
 *
 * @param bytes An array of at least two bytes (MSB first)
 * @return      The byte array represented as int16_t
 */
int16_t sensirion_common_bytes_to_int16_t(const uint8_t* bytes);

/**
 * sensirion_common_bytes_to_int32_t() - Convert an array of bytes to an int32_t
 *
 * Convert an array of bytes received from the sensor in big-endian/MSB-first
 * format to an int32_t value in the correct system-endianness.
 *
 * @param bytes An array of at least four bytes (MSB first)
 * @return      The byte array represented as int32_t
 */
int32_t sensirion_common_bytes_to_int32_t(const uint8_t* bytes);

/**
 * sensirion_common_bytes_to_uint16_t() - Convert an array of bytes to an
 * uint16_t
 *
 * Convert an array of bytes received from the sensor in big-endian/MSB-first
 * format to an uint16_t value in the correct system-endianness.
 *
 * @param bytes An array of at least two bytes (MSB first)
 * @return      The byte array represented as uint16_t
 */
uint16_t sensirion_common_bytes_to_uint16_t(const uint8_t* bytes);

/**
 * sensirion_common_bytes_to_uint32_t() - Convert an array of bytes to an
 * uint32_t
 *
 * Convert an array of bytes received from the sensor in big-endian/MSB-first
 * format to an uint32_t value in the correct system-endianness.
 *
 * @param bytes An array of at least four bytes (MSB first)
 * @return      The byte array represented as uint32_t
 */
uint32_t sensirion_common_bytes_to_uint32_t(const uint8_t* bytes);

/**
 * sensirion_common_bytes_to_float() - Convert an array of bytes to a float
 *
 * Convert an array of bytes received from the sensor in big-endian/MSB-first
 * format to an float value in the correct system-endianness.
 *
 * @param bytes An array of at least four bytes (MSB first)
 * @return      The byte array represented as float
 */
float sensirion_common_bytes_to_float(const uint8_t* bytes);

/**
 * sensirion_common_uint32_t_to_bytes() - Convert an uint32_t to an array of
 * bytes
 *
 * Convert an uint32_t value in system-endianness to big-endian/MBS-first
 * format to send to the sensor.
 *
 * @param value Value to convert
 * @param bytes An array of at least four bytes
 */
void sensirion_common_uint32_t_to_bytes(const uint32_t value, uint8_t* bytes);

/**
 * sensirion_common_uint16_t_to_bytes() - Convert an uint16_t to an array of
 * bytes
 *
 * Convert an uint16_t value in system-endianness to big-endian/MBS-first
 * format to send to the sensor.
 *
 * @param value Value to convert
 * @param bytes An array of at least two bytes
 */
void sensirion_common_uint16_t_to_bytes(const uint16_t value, uint8_t* bytes);

/**
 * sensirion_common_int32_t_to_bytes() - Convert an int32_t to an array of bytes
 *
 * Convert an int32_t value in system-endianness to big-endian/MBS-first
 * format to send to the sensor.
 *
 * @param value Value to convert
 * @param bytes An array of at least four bytes
 */
void sensirion_common_int32_t_to_bytes(const int32_t value, uint8_t* bytes);

/**
 * sensirion_common_int16_t_to_bytes() - Convert an int16_t to an array of bytes
 *
 * Convert an int16_t value in system-endianness to big-endian/MBS-first
 * format to send to the sensor.
 *
 * @param value Value to convert
 * @param bytes An array of at least two bytes
 */
void sensirion_common_int16_t_to_bytes(const int16_t value, uint8_t* bytes);

/**
 * sensirion_common_float_to_bytes() - Convert an float to an array of bytes
 *
 * Convert an float value in system-endianness to big-endian/MBS-first
 * format to send to the sensor.
 *
 * @param value Value to convert
 * @param bytes An array of at least four bytes
 */
void sensirion_common_float_to_bytes(const float value, uint8_t* bytes);

/**
 * sensirion_common_copy_bytes() - Copy bytes from one array to the other.
 *
 * @param source      Array of bytes to be copied.
 * @param destination Array of bytes to be copied to.
 * @param data_length Number of bytes to copy.
 */
void sensirion_common_copy_bytes(const uint8_t* source, uint8_t* destination,
                                 uint16_t data_length);

#ifdef __cplusplus
}
#endif

#endif /* SENSIRION_COMMON_H */