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tk17 raw reading

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This commit is contained in:
merlokk 2022-06-27 23:47:02 +03:00
commit cea9806226
1 changed files with 61 additions and 5 deletions
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66
client/src/cmdhftexkom.c
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@ -241,6 +241,52 @@ static uint8_t TexcomTK17CRC(uint8_t* data) {
return dallas_crc8(ddata, 8);
}
inline int TexcomTK17Get2Bits(uint32_t len1, uint32_t len2) {
uint32_t xlen = (len2 * 100) / (len1 + len2);
if (xlen < 10 || xlen > 90)
return -1;
if (xlen < 30)
return 0;
if (xlen < 50)
return 1;
if (xlen < 70)
return 2;
return 3;
}
static bool TexcomTK17Decode(uint32_t* implengths, uint32_t implengthslen, bool verbose) {
char bitstring[256] = {0};
for (uint32_t i = 0; i < implengthslen; i = i + 2) {
int dbit = TexcomTK17Get2Bits(implengths[i], implengths[i + 1]);
if (dbit < 0)
return false;
switch (dbit) {
case 0:
strcat(bitstring, "00");
break;
case 1:
strcat(bitstring, "01");
break;
case 2:
strcat(bitstring, "10");
break;
case 3:
strcat(bitstring, "11");
break;
default:
return false;
}
}
if (verbose)
PrintAndLogEx(INFO, "TK17 raw bit string [%d]: %s", strlen(bitstring), bitstring);
return strlen(bitstring) == 64;
}
static int CmdHFTexkomReader(const char *Cmd) {
CLIParserContext *ctx;
@ -270,7 +316,7 @@ static int CmdHFTexkomReader(const char *Cmd) {
uint32_t size = (resp.data.asDwords[0]);
if (size > 0) {
if (getSamples(samplesCount, true) != PM3_SUCCESS) {
if (getSamples(samplesCount, false) != PM3_SUCCESS) {
PrintAndLogEx(ERR, "Get samples error");
return PM3_EFAILED;
};
@ -318,11 +364,16 @@ static int CmdHFTexkomReader(const char *Cmd) {
}
PrintAndLogEx(WARNING, "--- impulses: %d, lenarray: %d, [%d,%d]", impulsecnt, implengthslen, implengths[0], implengths[1]);
// check if it TK-17 modulation
// 65 impulses and 64 intervals
if (impulsecnt == 65) {
if (TexcomTK17Decode(implengths, implengthslen, verbose))
break;
}
uint32_t hilength = 0;
uint32_t lowlength = 0;
uint32_t lenmax = 0;
uint32_t lenmin = 0;
if (!TexkomCalculateBitLengths(implengths, implengthslen, &hilength, &lowlength, &lenmax, &lenmin))
if (!TexkomCalculateBitLengths(implengths, implengthslen, &hilength, &lowlength, NULL, NULL))
continue;
uint32_t threshold = (hilength - lowlength) / 3 + 1;
@ -331,11 +382,16 @@ static int CmdHFTexkomReader(const char *Cmd) {
bitstring[0] = 0;
bool biterror = false;
for (uint32_t i = 0; i < implengthslen; i++) {
if (TexcomCalculateBit(implengths[i], hilength, MAX(threshold, lenmax - hilength)))
if (TexcomCalculateBit(implengths[i], hilength, threshold))
strcat(bitstring, "1");
else if (TexcomCalculateBit(implengths[i], lowlength, threshold))
strcat(bitstring, "0");
else {
PrintAndLogEx(INFO, "ERROR string [%d]: %s, bit: %d, blen: %d", strlen(bitstring), bitstring, i, implengths[i]);
//for (uint32_t j = 0; j < implengthslen; j++)
// printf("%d,", implengths[j]);
//printf("\r\n");
biterror = true;
break;
}