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ADD: LF JABLOTRON functionality. with clone/sim and detection in LF SEARCH.

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CHG: removed no-existing crc8ja code
FIX: a check in ASKbiphaseDemod to make sure graphbuff is not empty.
This commit is contained in:
iceman1001 2016-07-29 11:04:12 +02:00
commit 6c28395106
12 changed files with 426 additions and 177 deletions
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27
common/lfdemod.c
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@ -723,6 +723,33 @@ int FDXBdemodBI(uint8_t *dest, size_t *size)
return (int)startIdx;
}
// ASK/Diphase fc/64 (inverted Biphase)
// Note: this i s not a demod, this is only a detection
// the parameter *dest needs to be demoded before call
int JablotronDemod(uint8_t *dest, size_t *size){
//make sure buffer has enough data
if (*size < 64) return -1;
size_t startIdx = 0;
// 0xFFFF preamble, 64bits
uint8_t preamble[] = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx);
if (errChk == 0) return -4; //preamble not found
uint8_t checkCalc = 0;
for (int i=16; i < 56; i += 8) {
checkCalc += bytebits_to_byte(dest+startIdx+i,8);
}
checkCalc ^= 0x3A;
uint8_t crc = bytebits_to_byte(dest+startIdx+56,8);
if ( checkCalc != crc ) return -5;
if (*size != 64) return -6;
return (int)startIdx;
}
// by marshmellow
// FSK Demod then try to locate an AWID ID
int AWIDdemodFSK(uint8_t *dest, size_t *size)