//get high and low peak
int peak, low;
- if (getHiLo(dest, loopCnt, &peak, &low, 85, 85) < 1) return 0;
+ if (getHiLo(dest, loopCnt, &peak, &low, 90, 90) < 1) return 0;
int lowestTransition = DetectStrongNRZClk(dest, size-20, peak, low);
size_t ii;
uint16_t fcs = countFC(dest, size, 0);
*fc = fcs & 0xFF;
if (g_debugMode==2) prnt("DEBUG PSK: FC: %d, FC2: %d",*fc, fcs>>8);
- if ((fcs>>8) == 10 && *fc == 8) return -1;
- if (*fc!=2 && *fc!=4 && *fc!=8) return -1;
+ if ((fcs>>8) == 10 && *fc == 8) return 0;
+ if (*fc!=2 && *fc!=4 && *fc!=8) return 0;
//if we already have a valid clock quit
size_t i=1;
return clk[best];
}
-//int DetectPSKClock(uint8_t dest[], size_t size, int clock) {
-// size_t firstPhaseShift = 0;
-// uint8_t curPhase = 0;
-// return DetectPSKClock_ext(dest, size, clock, &firstPhaseShift, &curPhase);
-//}
-
//by marshmellow
//detects the bit clock for FSK given the high and low Field Clocks
-uint8_t detectFSKClk_ext(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fcLow, int *firstClockEdge) {
+uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fcLow, int *firstClockEdge) {
uint8_t clk[] = {8,16,32,40,50,64,100,128,0};
uint16_t rfLens[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
uint8_t rfCnts[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
return clk[ii];
}
-uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fcLow) {
- int firstClockEdge = 0;
- return detectFSKClk_ext(BitStream, size, fcHigh, fcLow, &firstClockEdge);
-}
-
//**********************************************************************************************
//--------------------Modulation Demods &/or Decoding Section-----------------------------------
//**********************************************************************************************
// look for Sequence Terminator - should be pulses of clk*(1 or 2), clk*2, clk*(1.5 or 2), by idx we mean graph position index...
bool findST(int *stStopLoc, int *stStartIdx, int lowToLowWaveLen[], int highToLowWaveLen[], int clk, int tol, int buffSize, size_t *i) {
+ if (buffSize < *i+4) return false;
+
for (; *i < buffSize - 4; *i+=1) {
*stStartIdx += lowToLowWaveLen[*i]; //caution part of this wave may be data and part may be ST.... to be accounted for in main function for now...
if (lowToLowWaveLen[*i] >= clk*1-tol && lowToLowWaveLen[*i] <= (clk*2)+tol && highToLowWaveLen[*i] < clk+tol) { //1 to 2 clocks depending on 2 bits prior
}
//by marshmellow
//attempt to identify a Sequence Terminator in ASK modulated raw wave
-bool DetectST_ext(uint8_t buffer[], size_t *size, int *foundclock, size_t *ststart, size_t *stend) {
+bool DetectST(uint8_t buffer[], size_t *size, int *foundclock, size_t *ststart, size_t *stend) {
size_t bufsize = *size;
//need to loop through all samples and identify our clock, look for the ST pattern
int clk = 0;
*size = newloc;
return true;
}
-bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) {
- size_t ststart = 0, stend = 0;
- return DetectST_ext(buffer, size, foundclock, &ststart, &stend);
-}
//by marshmellow
//take 11 10 01 11 00 and make 01100 ... miller decoding
//take 01 or 10 = 1 and 11 or 00 = 0
//check for phase errors - should never have 111 or 000 should be 01001011 or 10110100 for 1010
//decodes biphase or if inverted it is AKA conditional dephase encoding AKA differential manchester encoding
-int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert) {
+int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int *offset, int invert) {
uint16_t bitnum = 0;
uint16_t errCnt = 0;
- size_t i = offset;
+ size_t i = *offset;
uint16_t MaxBits=512;
//if not enough samples - error
if (*size < 51) return -1;
if (BitStream[i+1]==BitStream[i+2]) offsetA=0;
if (BitStream[i+2]==BitStream[i+3]) offsetB=0;
}
- if (!offsetA && offsetB) offset++;
- for (i=offset; i<*size-3; i+=2){
+ if (!offsetA && offsetB) *offset+=1;
+ for (i=*offset; i<*size-3; i+=2){
//check for phase error
if (BitStream[i+1]==BitStream[i+2]) {
BitStream[bitnum++]=7;
//by marshmellow (from holiman's base)
// full fsk demod from GraphBuffer wave to decoded 1s and 0s (no mandemod)
int fskdemod_ext(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t invert, uint8_t fchigh, uint8_t fclow, int *startIdx) {
+ if (justNoise(dest, size)) return 0;
// FSK demodulator
size = fsk_wave_demod(dest, size, fchigh, fclow, startIdx);
size = aggregate_bits(dest, size, rfLen, invert, fchigh, fclow, startIdx);
uint16_t errCnt=0, errCnt2=0;
*clock = DetectPSKClock(dest, *size, *clock, &firstFullWave, &curPhase, &fc);
- if (*clock == 0) return -1;
+ if (*clock <= 0) return -1;
//if clock detect found firstfullwave...
uint16_t tol = fc/2;
if (firstFullWave == 0) {
//make sure buffer has enough data
if (*size < 96*50) return -1;
- if (justNoise(dest, *size)) return -2;
-
// FSK demodulator
*size = fskdemod(dest, *size, 50, 1, 10, 8); // fsk2a RF/50
if (*size < 96) return -3; //did we get a good demod?
// loop to get raw HID waveform then FSK demodulate the TAG ID from it
int HIDdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo) {
- if (justNoise(dest, *size)) return -1;
-
size_t numStart=0, size2=*size, startIdx=0;
// FSK demodulator
*size = fskdemod(dest, size2,50,1,10,8); //fsk2a
}
int IOdemodFSK(uint8_t *dest, size_t size) {
- if (justNoise(dest, size)) return -1;
//make sure buffer has data
if (size < 66*64) return -2;
// FSK demodulator
// loop to get raw paradox waveform then FSK demodulate the TAG ID from it
int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo) {
- if (justNoise(dest, *size)) return -1;
-
size_t numStart=0, size2=*size, startIdx=0;
// FSK demodulator
*size = fskdemod(dest, size2,50,1,10,8); //fsk2a
//make sure buffer has data
if (*size < 128*50) return -5;
- //test samples are not just noise
- if (justNoise(dest, *size)) return -1;
-
// FSK demodulator
*size = fskdemod(dest, *size, 50, 1, 10, 8); // fsk2a RF/50
if (*size < 128) return -2; //did we get a good demod?
projects / proxmark3-svn / blobdiff