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ADD: first try to implement crc-16 for Legic Advant *not working yet* Can't verify it.

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iceman1001 2016-02-16 10:44:12 +01:00
commit 1d5464397c
2 changed files with 9 additions and 0 deletions
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8
common/crc16.c
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@ -9,6 +9,7 @@
#include "crc16.h"
#define CRC16_POLY_CCITT 0x1021
#define CRC16_POLY 0x8408
#define CRC16_POLY_LEGIC 0xB400
unsigned short update_crc16( unsigned short crc, unsigned char c )
{
@ -48,6 +49,13 @@ uint16_t crc16_ccitt(uint8_t const *message, int length) {
uint16_t crc16_ccitt_kermit(uint8_t const *message, int length) {
return bit_reverse_uint16(crc16(message, length, 0x0000, CRC16_POLY_CCITT));
}
//ICEMAN: not working yet,
// This CRC-16 is used in Legic Advant systems.
uint16_t crc16_legic(uint8_t const *message, int length, uint16_t inital) {
return crc16(message, length, inital, CRC16_POLY_LEGIC);
}
uint16_t bit_reverse_uint16 (uint16_t value) {
const uint16_t mask0 = 0x5555;
const uint16_t mask1 = 0x3333;