diff options
| author | Harald Welte <laforge@gnumonks.org> | 2017-10-16 14:29:26 +0200 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2017-10-16 14:29:26 +0200 |
| commit | 197a4ac06d2bb84c7fa3232f78a9e45f9d58e53e (patch) | |
| tree | 3848175049dcb85ac639af83408acfe5adb8ff82 /src/crc16.c | |
| parent | ef7a44e33d52ab2e046efdd2535c9428796fc09e (diff) | |
[doc] Put CRC-16 and generic CRC code in one Doxygen module
.. and add missing API documentation bits
Change-Id: I67119894bcbf8c779426a0272bae4c5ce1fbd1ed
Diffstat (limited to 'src/crc16.c')
| -rw-r--r-- | src/crc16.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/src/crc16.c b/src/crc16.c index b5cb9566..c03c0081 100644 --- a/src/crc16.c +++ b/src/crc16.c @@ -1,4 +1,6 @@ -/*! \file crc16.c +/*! \addtogroup crc + * @{ + * \file crc16.c * This was copied from the linux kernel and adjusted for our types. */ /* @@ -46,7 +48,7 @@ uint16_t const osmo_crc16_table[256] = { 0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040 }; -/*! compute the CRC-16 for the data buffer +/*! Compute 16bit CCITT polynome 0x8408 (x^0 + x^5 + x^12) over given buffer. * \param crc[in] previous CRC value * \param buffer[in] data pointer * \param len[in] number of bytes in input \ref buffer @@ -59,6 +61,7 @@ uint16_t osmo_crc16(uint16_t crc, uint8_t const *buffer, size_t len) return crc; } +/*! CRC table for the CCITT CRC-6. The poly is 0x8408 (x^0 + x^5 + x^12) */ uint16_t const osmo_crc16_ccitt_table[256] = { 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, @@ -94,9 +97,17 @@ uint16_t const osmo_crc16_ccitt_table[256] = { 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 }; + +/*! Compute 16bit CCITT polynome 0x8408 (x^0 + x^5 + x^12) over given buffer. + * \param[in] crc initial value of CRC + * \param[in] buffer pointer to buffer of input data + * \param[in] len length of \a buffer in bytes + * \returns 16bit CRC */ uint16_t osmo_crc16_ccitt(uint16_t crc, uint8_t const *buffer, size_t len) { while (len--) crc = osmo_crc16_ccitt_byte(crc, *buffer++); return crc; } + +/*! @} */ |