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new crc16 option used with Philips toothbrushes. different init value 0x49a3. Should be reported to the CRC catalog https://reveng.sourceforge.io/crc-catalogue/16.htm

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This commit is contained in:
iceman1001 2023-06-10 12:17:56 +02:00
parent d5f8202284
commit f1d78c4e7c
2 changed files with 18 additions and 9 deletions
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23
common/crc16.c
View file

@ -42,10 +42,14 @@ void init_table(CrcType_t crctype) {
case CRC_15693:
case CRC_ICLASS:
case CRC_CRYPTORF:
case CRC_KERMIT:
generate_table(CRC16_POLY_CCITT, true);
break;
case CRC_FELICA:
case CRC_XMODEM:
case CRC_CCITT:
case CRC_11784:
case CRC_PHILIPS:
generate_table(CRC16_POLY_CCITT, false);
break;
case CRC_LEGIC:
@ -54,15 +58,6 @@ void init_table(CrcType_t crctype) {
case CRC_LEGIC_16:
generate_table(CRC16_POLY_LEGIC_16, true);
break;
case CRC_CCITT:
generate_table(CRC16_POLY_CCITT, false);
break;
case CRC_KERMIT:
generate_table(CRC16_POLY_CCITT, true);
break;
case CRC_11784:
generate_table(CRC16_POLY_CCITT, false);
break;
case CRC_NONE:
crc_table_init = false;
current_crc_type = CRC_NONE;
@ -210,6 +205,9 @@ void compute_crc(CrcType_t ct, const uint8_t *d, size_t n, uint8_t *first, uint8
case CRC_LEGIC_16:
// TODO
return;
case CRC_PHILIPS:
crc = crc16_philips(d, n);
break;
case CRC_NONE:
return;
}
@ -244,6 +242,8 @@ uint16_t Crc16ex(CrcType_t ct, const uint8_t *d, size_t n) {
case CRC_LEGIC_16:
// TODO
return 0;
case CRC_PHILIPS:
return crc16_philips(d, n);
case CRC_NONE:
default:
break;
@ -290,6 +290,8 @@ bool check_crc(CrcType_t ct, const uint8_t *d, size_t n) {
case CRC_LEGIC_16:
// TODO
return false;
case CRC_PHILIPS:
return (crc16_philips(d, n) == 0);
case CRC_NONE:
default:
break;
@ -350,3 +352,6 @@ uint16_t crc16_legic(uint8_t const *d, size_t n, uint8_t uidcrc) {
return crc16_fast(d, n, initial, true, false);
}
uint16_t crc16_philips(uint8_t const *d, size_t n) {
return crc16_fast(d, n, 0x49A3, false, false);
}

4
common/crc16.h
View file

@ -42,6 +42,7 @@ typedef enum {
CRC_KERMIT,
CRC_XMODEM,
CRC_CRYPTORF,
CRC_PHILIPS,
} CrcType_t;
uint16_t update_crc16_ex(uint16_t crc, uint8_t c, uint16_t polynomial);
@ -78,6 +79,9 @@ uint16_t crc16_iclass(uint8_t const *d, size_t n);
// ie: uidcrc = 0x78 then initial_value == 0x7878
uint16_t crc16_legic(uint8_t const *d, size_t n, uint8_t uidcrc);
// Calculate CRC-16/ Philips.
uint16_t crc16_philips(uint8_t const *d, size_t n);
// table implementation
void init_table(CrcType_t crctype);
void reset_table(void);