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sys: util: add binary coded decimal functions

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Some devices (such as RTCs) have data formats that expect BCD values
instead of binary. These routines allow for converting between binary
and BCD formats.

Signed-off-by: Jake Swensen <jake@swensen.io>
This commit is contained in:
Jake Swensen 2021-08-18 18:13:20 -05:00 • committed by Christopher Friedt
commit 67459aa2a7
1 changed files with 24 additions and 0 deletions
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24
include/sys/util.h
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@ -285,6 +285,30 @@ size_t bin2hex(const uint8_t *buf, size_t buflen, char *hex, size_t hexlen);
*/
size_t hex2bin(const char *hex, size_t hexlen, uint8_t *buf, size_t buflen);
/**
* @brief Convert a binary coded decimal (BCD 8421) value to binary.
*
* @param bcd BCD 8421 value to convert.
*
* @return Binary representation of input value.
*/
static inline uint8_t bcd2bin(uint8_t bcd)
{
return ((10 * (bcd >> 4)) + (bcd & 0x0F));
}
/**
* @brief Convert a binary value to binary coded decimal (BCD 8421).
*
* @param bin Binary value to convert.
*
* @return BCD 8421 representation of input value.
*/
static inline uint8_t bin2bcd(uint8_t bin)
{
return (((bin / 10) << 4) | (bin % 10));
}
/**
* @brief Convert a uint8_t into a decimal string representation.
*