a752c7ab
 elopes
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/*
* Copyright (C) 2017 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup sys_bcd Binary coded decimal
* @ingroup sys
* @brief Library to de- and encode binary coded decimals
* @{
*
* @file
* @brief BCD definitions
*
* @author Martine Lenders <m.lenders@fu-berlin.de>
*/
#ifndef BCD_H
#define BCD_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Converts a byte to a binary coded decimal
*
* @param[in] byte A byte
*
* @return A binary coded decimal (4 MSB = 10s, 4 LSB = 1s)
*/
static inline uint8_t bcd_from_byte(uint8_t byte)
{
/* ((byte / 10) << 4) | (byte % 10) */
return byte + (6 * (byte / 10));
}
/**
* @brief Converts a binary coded decimal to a byte
*
* @param[in] bcd A binary coded decimal (4 MSB = 10, 4 LSB = 1s)
*
* @return A byte
*/
static inline uint8_t bcd_to_byte(uint8_t bcd)
{
/* == (10 * (bcd >> 4)) + (bcd & 0xf) */
return bcd - (6 * (bcd >> 4));
}
#ifdef __cplusplus
}
#endif
#endif /* BCD_H */
/** @} */
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