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CHG: iso15 from b8f35947f2 @lnv42

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This commit is contained in:
iceman1001 2018-01-16 21:07:58 +01:00
commit 93ecfddb88
3 changed files with 51 additions and 53 deletions
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56
common/iso15693tools.c
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@ -43,6 +43,17 @@ int Iso15693AddCrc(uint8_t *req, int n) {
return n+2;
}
// check the CRC as described in ISO 15693-Part 3-Annex C
// v buffer with data
// n length (including crc)
// returns true if the crc is valid, else return false
bool Iso15693CheckCrc(uint8_t *v, int n) {
uint16_t crc = Iso15693Crc(v, n-2);
if ( (( crc & 0xff ) == v[n-2]) && (( crc >> 8 ) == v[n-1]) )
return true;
return false;
}
int sprintf(char *str, const char *format, ...);
// returns a string representation of the UID
@ -62,31 +73,26 @@ char* Iso15693sprintUID(char *target, uint8_t *uid) {
return target;
}
uint16_t iclass_crc16(char *data_p, unsigned short length)
{
unsigned char i;
unsigned int data;
uint16_t crc = 0xffff;
uint16_t iclass_crc16(char *data_p, unsigned short length) {
unsigned char i;
unsigned int data;
uint16_t crc = 0xffff;
if (length == 0)
return (~crc);
if (length == 0)
return (~crc);
do
{
for (i=0, data=(unsigned int)0xff & *data_p++;
i < 8;
i++, data >>= 1)
{
if ((crc & 0x0001) ^ (data & 0x0001))
crc = (crc >> 1) ^ POLY;
else crc >>= 1;
}
} while (--length);
crc = ~crc;
data = crc;
crc = (crc << 8) | (data >> 8 & 0xff);
crc = crc ^ 0xBC3;
return (crc);
}
do {
for (i=0, data = (unsigned int)0xff & *data_p++; i < 8; i++, data >>= 1) {
if ((crc & 0x0001) ^ (data & 0x0001))
crc = (crc >> 1) ^ POLY;
else
crc >>= 1;
}
} while (--length);
crc = ~crc;
data = crc;
crc = (crc << 8) | (data >> 8 & 0xff);
crc = crc ^ 0xBC3;
return crc;
}