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chg: crc16 got a compute_crc function

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This commit is contained in:
iceman1001 2018-01-30 03:31:11 +01:00
commit bf25b1c9ba
6 changed files with 41 additions and 10 deletions
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17
common/crc16.c
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@ -146,6 +146,23 @@ uint16_t crc16(uint8_t const *d, size_t length, uint16_t remainder, uint16_t pol
return remainder;
}
void compute_crc(CrcType_t ct, const uint8_t *d, size_t n, uint8_t *first, uint8_t *second) {
uint16_t crc = 0;
switch (ct) {
case CRC_14A: crc = crc16_a(d, n); break;
case CRC_14B:
case CRC_15: crc = crc16_x25(d, n); break;
case CRC_15_ICLASS: crc = crc16_iclass(d, n); break;
case CRC_FELICA:crc = crc16_xmodem(d, n); break;
//case CRC_LEGIC:
case CRC_DNP: crc = crc16_dnp(d, n); break;
case CRC_CCITT: crc = crc16_ccitt(d, n); break;
default: break;
}
*first = (crc & 0xFF);
*second = ((crc >> 8) & 0xFF);
}
//poly=0x1021 init=0xffff refin=false refout=false xorout=0x0000 check=0x29b1 residue=0x0000 name="CRC-16/CCITT-FALSE"
uint16_t crc16_ccitt(uint8_t const *d, size_t n) {
return crc16_fast(d, n, 0xffff, false, false);