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CHG: refactor CRC16 algos. This is a big change, most likely some parts broke, hard to test it all.

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iceman1001 2018-02-01 15:19:47 +01:00
commit 52d69ed4ee
35 changed files with 512 additions and 674 deletions
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27
common/iso15693tools.c
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@ -3,35 +3,10 @@
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// ISO15693 CRC & other commons
// ISO15693 other commons
//-----------------------------------------------------------------------------
#include "iso15693tools.h"
// The CRC as described in ISO 15693-Part 3-Annex C
uint16_t Iso15693Crc(uint8_t *d, size_t n){
init_table(CRC_15);
return crc16_x25(d, n);
}
// adds a CRC to a dataframe
// d[] iso15963 frame without crc
// n length without crc
// returns the new length of the dataframe.
int Iso15693AddCrc(uint8_t *d, size_t n) {
uint16_t crc = Iso15693Crc(d, n);
d[n] = crc & 0xff;
d[n+1] = crc >> 8;
return n + 2;
}
// check the CRC as described in ISO 15693-Part 3-Annex C
// v buffer with data
// n length (including crc)
// If calculated with crc bytes, the residue should be 0xF0B8
bool Iso15693CheckCrc(uint8_t *d, size_t n) {
return (Iso15693Crc(d, n) == ISO15_CRC_CHECK );
}
int sprintf(char *str, const char *format, ...);
// returns a string representation of the UID