SRT512_12 datasheet(42/46 Pages) STMICROELECTRONICS

Part #	SRT512

Description	13.56 MHz short-range contactless memory chip with 512-bit EEPROM and anticollision functions

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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42 / 46 page

ISO14443 type B CRC calculation

SRT512

42/46

Doc ID 13277 Rev 6

Appendix A

ISO14443 type B CRC calculation

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <ctype.h>

#define BYTE unsigned char

#define USHORT unsigned short

unsigned short UpdateCrc(BYTE ch, USHORT *lpwCrc)

{

ch = (ch^(BYTE)((*lpwCrc) & 0x00FF));

ch = (ch^(ch<<4));

*lpwCrc = (*lpwCrc >> 8)^((USHORT)ch <<

8)^((USHORT)ch<<3)^((USHORT)ch>>4);

return(*lpwCrc);

}

void ComputeCrc(char *Data, int Length, BYTE *TransmitFirst, BYTE

*TransmitSecond)

{

BYTE chBlock; USHORTt wCrc;

wCrc = 0xFFFF; // ISO 3309

do

{

chBlock = *Data++;

UpdateCrc(chBlock, &wCrc);

} while (--Length);

wCrc = ~wCrc; // ISO 3309

*TransmitFirst = (BYTE) (wCrc & 0xFF);

*TransmitSecond = (BYTE) ((wCrc >> 8) & 0xFF);

return;

}

int main(void)

{

BYTE BuffCRC_B[10] = {0x0A, 0x12, 0x34, 0x56}, First, Second, i;

printf("Crc-16 G(x) = x^16 + x^12 + x^5 + 1”);

printf("CRC_B of [ ");

for(i=0; i<4; i++)

printf("%02X ",BuffCRC_B[i]);

ComputeCrc(BuffCRC_B, 4, &First, &Second);

printf("] Transmitted: %02X then %02X.”, First, Second);

return(0);

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