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CHG: trying to unify the crc algos in one place.

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This commit is contained in:
iceman1001 2016-08-04 21:52:32 +02:00
commit 82e690f48b
4 changed files with 32 additions and 14 deletions
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18
common/crc.c
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@ -82,7 +82,6 @@ uint32_t CRC8Maxim(uint8_t *buff, size_t size) {
return crc_finish(&crc);
}
// width=4 poly=0xC, reversed poly=0x7 init=0x5 refin=true refout=true xorout=0x0000 check= name="CRC-4/LEGIC"
// width=8 poly=0x63, reversed poly=0x8D init=0x55 refin=true refout=true xorout=0x0000 check=0xC6 name="CRC-8/LEGIC"
// the CRC needs to be reversed before returned.
@ -126,4 +125,21 @@ uint32_t CRC16_CCITT(uint8_t *buff, size_t size) {
for ( int i=0; i < size; ++i)
crc_update(&crc, buff[i], 8);
return crc_finish(&crc);
}
//width=16 poly=0x8408 init=0xffff refin=false refout=true xorout=0xffff check=0xF0B8 name="CRC-16/ISO/IEC 13239"
uint32_t CRC16_Iso15693(uint8_t *buff, size_t size) {
crc_t crc;
crc_init_ref(&crc, 16, 0x8408, 0xFFFF, 0xFFFF, true, false);
for ( int i=0; i < size; ++i)
crc_update(&crc, buff[i], 8);
return reflect(crc_finish(&crc), 16);
}
//width=16 poly=0x8408 init=0xffff refin=true refout=true xorout=0x0BC3 check=0xF0B8 name="CRC-16/ICLASS"
uint32_t CRC16_ICLASS(uint8_t *buff, size_t size) {
crc_t crc;
crc_init_ref(&crc, 16, 0x8408, 0xFFFF, 0x0BC3, false, false);
for ( int i=0; i < size; ++i)
crc_update(&crc, buff[i], 8);
return crc_finish(&crc);
}