X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/03e6bb4aed0ffd8e19897062071e18945c703d9d..ec9882b18c9e12a60bb0face34ea4bcc072c2dfb:/common/lfdemod.c diff --git a/common/lfdemod.c b/common/lfdemod.c index 34194394..bee87ece 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -12,8 +12,20 @@ #include #include "lfdemod.h" + +uint8_t justNoise(uint8_t *BitStream, size_t size) +{ + static const uint8_t THRESHOLD = 123; + //test samples are not just noise + uint8_t justNoise1 = 1; + for(size_t idx=0; idx < size && justNoise1 ;idx++){ + justNoise1 = BitStream[idx] < THRESHOLD; + } + return justNoise1; +} + //by marshmellow -//get high and low with passed in fuzz factor. also return noise test = 1 for passed or 0 for only noise +//get high and low values of a wave with passed in fuzz factor. also return noise test = 1 for passed or 0 for only noise int getHiLo(uint8_t *BitStream, size_t size, int *high, int *low, uint8_t fuzzHi, uint8_t fuzzLo) { *high=0; @@ -29,74 +41,99 @@ int getHiLo(uint8_t *BitStream, size_t size, int *high, int *low, uint8_t fuzzHi return 1; } +// by marshmellow +// pass bits to be tested in bits, length bits passed in bitLen, and parity type (even=0 | odd=1) in pType +// returns 1 if passed +uint8_t parityTest(uint32_t bits, uint8_t bitLen, uint8_t pType) +{ + uint8_t ans = 0; + for (uint8_t i = 0; i < bitLen; i++){ + ans ^= ((bits >> i) & 1); + } + //PrintAndLog("DEBUG: ans: %d, ptype: %d",ans,pType); + return (ans == pType); +} + +//by marshmellow +//search for given preamble in given BitStream and return startIndex and length +uint8_t preambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_t *size, size_t *startIdx) +{ + uint8_t foundCnt=0; + for (int idx=0; idx < *size - pLen; idx++){ + if (memcmp(BitStream+idx, preamble, pLen) == 0){ + //first index found + foundCnt++; + if (foundCnt == 1){ + *startIdx = idx; + } + if (foundCnt == 2){ + *size = idx - *startIdx; + return 1; + } + } + } + return 0; +} + + //by marshmellow //takes 1s and 0s and searches for EM410x format - output EM ID uint64_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx) { - //no arguments needed - built this way in case we want this to be a direct call from "data " cmds in the future - // otherwise could be a void with no arguments - //set defaults - uint64_t lo=0; - uint32_t i = 0; - if (BitStream[10]>1){ //allow only 1s and 0s - // PrintAndLog("no data found"); - return 0; - } - uint8_t parityTest=0; - // 111111111 bit pattern represent start of frame - uint8_t frame_marker_mask[] = {1,1,1,1,1,1,1,1,1}; - uint32_t idx = 0; - uint32_t ii=0; - uint8_t resetCnt = 0; - while( (idx + 64) < *size) { - restart: - // search for a start of frame marker - if ( memcmp(BitStream+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) - { // frame marker found - *startIdx=idx; - idx+=9; - for (i=0; i<10;i++){ - for(ii=0; ii<5; ++ii){ - parityTest ^= BitStream[(i*5)+ii+idx]; - } - if (!parityTest){ //even parity - parityTest=0; - for (ii=0; ii<4;++ii){ - lo=(lo<<1LL)|(BitStream[(i*5)+ii+idx]); - } - //PrintAndLog("DEBUG: EM parity passed parity val: %d, i:%d, ii:%d,idx:%d, Buffer: %d%d%d%d%d,lo: %d",parityTest,i,ii,idx,BitStream[idx+ii+(i*5)-5],BitStream[idx+ii+(i*5)-4],BitStream[idx+ii+(i*5)-3],BitStream[idx+ii+(i*5)-2],BitStream[idx+ii+(i*5)-1],lo); - }else {//parity failed - //PrintAndLog("DEBUG: EM parity failed parity val: %d, i:%d, ii:%d,idx:%d, Buffer: %d%d%d%d%d",parityTest,i,ii,idx,BitStream[idx+ii+(i*5)-5],BitStream[idx+ii+(i*5)-4],BitStream[idx+ii+(i*5)-3],BitStream[idx+ii+(i*5)-2],BitStream[idx+ii+(i*5)-1]); - parityTest=0; - idx-=8; - if (resetCnt>5)return 0; //try 5 times - resetCnt++; - goto restart;//continue; - } - } - //skip last 5 bit parity test for simplicity. - *size = 64; - return lo; - }else{ - idx++; - } - } - return 0; + //no arguments needed - built this way in case we want this to be a direct call from "data " cmds in the future + // otherwise could be a void with no arguments + //set defaults + uint64_t lo=0; + uint32_t i = 0; + if (BitStream[1]>1){ //allow only 1s and 0s + // PrintAndLog("no data found"); + return 0; + } + // 111111111 bit pattern represent start of frame + uint8_t preamble[] = {1,1,1,1,1,1,1,1,1}; + uint32_t idx = 0; + uint32_t parityBits = 0; + uint8_t errChk = 0; + *startIdx = 0; + for (uint8_t extraBitChk=0; extraBitChk<5; extraBitChk++){ + errChk = preambleSearch(BitStream+extraBitChk+*startIdx, preamble, sizeof(preamble), size, startIdx); + if (errChk == 0) return 0; + idx = *startIdx + 9; + for (i=0; i<10;i++){ //loop through 10 sets of 5 bits (50-10p = 40 bits) + parityBits = bytebits_to_byte(BitStream+(i*5)+idx,5); + //check even parity + if (parityTest(parityBits, 5, 0) == 0){ + //parity failed try next bit (in the case of 1111111111) but last 9 = preamble + startIdx++; + errChk = 0; + break; + } + //set uint64 with ID from BitStream + for (uint8_t ii=0; ii<4; ii++){ + lo = (lo << 1LL) | (BitStream[(i*5)+ii+idx]); + } + } + if (errChk != 0) return lo; + //skip last 5 bit parity test for simplicity. + // *size = 64; + } + return 0; } //by marshmellow -//takes 2 arguments - clock and invert both as integers +//takes 3 arguments - clock, invert, maxErr as integers //attempts to demodulate ask while decoding manchester //prints binary found and saves in graphbuffer for further commands -int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) +int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert, int maxErr) { int i; - int clk2=*clk; - *clk=DetectASKClock(BinStream, *size, *clk); //clock default - + //int clk2=*clk; + int start = DetectASKClock(BinStream, *size, clk, 20); //clock default + if (*clk==0) return -3; + if (start < 0) return -3; // if autodetected too low then adjust //MAY NEED ADJUSTMENT - if (clk2==0 && *clk<8) *clk =64; - if (clk2==0 && *clk<32) *clk=32; + //if (clk2==0 && *clk<8) *clk =64; + //if (clk2==0 && *clk<32) *clk=32; if (*invert != 0 && *invert != 1) *invert=0; uint32_t initLoopMax = 200; if (initLoopMax > *size) initLoopMax=*size; @@ -110,14 +147,14 @@ int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) int lastBit = 0; //set first clock check uint32_t bitnum = 0; //output counter int tol = 0; //clock tolerance adjust - waves will be accepted as within the clock if they fall + or - this value + clock from last valid wave - if (*clk<=32)tol=1; //clock tolerance may not be needed anymore currently set to + or - 1 but could be increased for poor waves or removed entirely + if (*clk<=32) tol=1; //clock tolerance may not be needed anymore currently set to + or - 1 but could be increased for poor waves or removed entirely int iii = 0; uint32_t gLen = *size; if (gLen > 3000) gLen=3000; uint8_t errCnt =0; + uint16_t MaxBits = 500; uint32_t bestStart = *size; - uint32_t bestErrCnt = (*size/1000); - uint32_t maxErr = (*size/1000); + int bestErrCnt = maxErr+1; // PrintAndLog("DEBUG - lastbit - %d",lastBit); // loop to find first wave that works for (iii=0; iii < gLen; ++iii){ @@ -144,10 +181,10 @@ int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) if (errCnt>(maxErr)) break; //allow 1 error for every 1000 samples else start over } } - if ((i-iii) >(400 * *clk)) break; //got plenty of bits + if ((i-iii) >(MaxBits * *clk)) break; //got plenty of bits } //we got more than 64 good bits and not all errors - if ((((i-iii)/ *clk) > (64+errCnt)) && (errCnt (64)) && (errCnt<=maxErr)) { //possible good read if (errCnt==0){ bestStart=iii; @@ -161,7 +198,7 @@ int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) } } } - if (bestErrCnt=400) break; + if (bitnum >=MaxBits) break; } *size=bitnum; } else{ @@ -208,14 +245,14 @@ int ManchesterEncode(uint8_t *BitStream, size_t size) { size_t modIdx=20000, i=0; if (size>modIdx) return -1; - for (size_t idx=0; idx < size; idx++){ - BitStream[idx+modIdx++] = BitStream[idx]; - BitStream[idx+modIdx++] = BitStream[idx]^1; - } - for (; i<(size*2); i++){ - BitStream[i] = BitStream[i+20000]; - } - return i; + for (size_t idx=0; idx < size; idx++){ + BitStream[idx+modIdx++] = BitStream[idx]; + BitStream[idx+modIdx++] = BitStream[idx]^1; + } + for (; i<(size*2); i++){ + BitStream[i] = BitStream[i+20000]; + } + return i; } //by marshmellow @@ -223,12 +260,14 @@ int ManchesterEncode(uint8_t *BitStream, size_t size) //run through 2 times and take least errCnt int manrawdecode(uint8_t * BitStream, size_t *size) { - int bitnum=0; - int errCnt =0; - int i=1; - int bestErr = 1000; - int bestRun = 0; - int ii=1; + uint16_t bitnum=0; + uint16_t MaxBits = 500; + uint16_t errCnt = 0; + size_t i=1; + uint16_t bestErr = 1000; + uint16_t bestRun = 0; + size_t ii=1; + if (size == 0) return -1; for (ii=1;ii<3;++ii){ i=1; for (i=i+ii;i<*size-2;i+=2){ @@ -237,7 +276,7 @@ int manrawdecode(uint8_t * BitStream, size_t *size) } else { errCnt++; } - if(bitnum>300) break; + if(bitnum>MaxBits) break; } if (bestErr>errCnt){ bestErr=errCnt; @@ -249,7 +288,7 @@ int manrawdecode(uint8_t * BitStream, size_t *size) if (errCnt<20){ ii=bestRun; i=1; - for (i=i+ii;i < *size-2;i+=2){ + for (i=i+ii; i < *size-2; i+=2){ if(BitStream[i] == 1 && (BitStream[i+1] == 0)){ BitStream[bitnum++]=0; } else if((BitStream[i] == 0) && BitStream[i+1] == 1){ @@ -258,7 +297,7 @@ int manrawdecode(uint8_t * BitStream, size_t *size) BitStream[bitnum++]=77; //errCnt++; } - if(bitnum>300) break; + if(bitnum>MaxBits) break; } *size=bitnum; } @@ -269,10 +308,12 @@ int manrawdecode(uint8_t * BitStream, size_t *size) //take 01 or 10 = 0 and 11 or 00 = 1 int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert) { - uint8_t bitnum=0; + uint16_t bitnum=0; uint32_t errCnt =0; uint32_t i; + uint16_t MaxBits=500; i=offset; + if (size == 0) return -1; for (;i<*size-2; i+=2){ if((BitStream[i]==1 && BitStream[i+1]==0) || (BitStream[i]==0 && BitStream[i+1]==1)){ BitStream[bitnum++]=1^invert; @@ -282,84 +323,94 @@ int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert) BitStream[bitnum++]=77; errCnt++; } - if(bitnum>250) break; + if(bitnum>MaxBits) break; } *size=bitnum; return errCnt; } //by marshmellow -//takes 2 arguments - clock and invert both as integers +void askAmp(uint8_t *BitStream, size_t size) +{ + int shift = 127; + int shiftedVal=0; + for(int i = 1; i=30) //large jump up + shift=127; + else if(BitStream[i]-BitStream[i-1]<=-20) //large jump down + shift=-127; + + shiftedVal=BitStream[i]+shift; + + if (shiftedVal>255) + shiftedVal=255; + else if (shiftedVal<0) + shiftedVal=0; + BitStream[i-1] = shiftedVal; + } + return; +} + +//by marshmellow +//takes 3 arguments - clock, invert and maxErr as integers //attempts to demodulate ask only //prints binary found and saves in graphbuffer for further commands -int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) +int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert, int maxErr, uint8_t amp) { uint32_t i; - // int invert=0; //invert default - int clk2 = *clk; - *clk=DetectASKClock(BinStream, *size, *clk); //clock default - //uint8_t BitStream[502] = {0}; - - //HACK: if clock not detected correctly - default - if (clk2==0 && *clk<8) *clk =64; - if (clk2==0 && *clk<32 && clk2==0) *clk=32; + if (*size==0) return -1; + int start = DetectASKClock(BinStream, *size, clk, 20); //clock default + if (*clk==0) return -1; + if (start<0) return -1; if (*invert != 0 && *invert != 1) *invert =0; uint32_t initLoopMax = 200; if (initLoopMax > *size) initLoopMax=*size; // Detect high and lows //25% fuzz in case highs and lows aren't clipped [marshmellow] int high, low, ans; + if (amp==1) askAmp(BinStream, *size); ans = getHiLo(BinStream, initLoopMax, &high, &low, 75, 75); - if (ans<1) return -2; //just noise + if (ans<1) return -1; //just noise //PrintAndLog("DEBUG - valid high: %d - valid low: %d",high,low); int lastBit = 0; //set first clock check uint32_t bitnum = 0; //output counter uint8_t tol = 0; //clock tolerance adjust - waves will be accepted as within the clock // if they fall + or - this value + clock from last valid wave - if (*clk == 32) tol=1; //clock tolerance may not be needed anymore currently set to + if (*clk == 32) tol=0; //clock tolerance may not be needed anymore currently set to // + or - 1 but could be increased for poor waves or removed entirely uint32_t iii = 0; uint32_t gLen = *size; if (gLen > 500) gLen=500; uint8_t errCnt =0; uint32_t bestStart = *size; - uint32_t bestErrCnt = (*size/1000); - uint32_t maxErr = bestErrCnt; + uint32_t bestErrCnt = maxErr; //(*size/1000); uint8_t midBit=0; + uint16_t MaxBits=1000; //PrintAndLog("DEBUG - lastbit - %d",lastBit); //loop to find first wave that works - for (iii=0; iii < gLen; ++iii){ + for (iii=start; iii < gLen; ++iii){ if ((BinStream[iii]>=high) || (BinStream[iii]<=low)){ lastBit=iii-*clk; + errCnt=0; //loop through to see if this start location works for (i = iii; i < *size; ++i) { if ((BinStream[i] >= high) && ((i-lastBit)>(*clk-tol))){ lastBit+=*clk; - //BitStream[bitnum] = *invert; - //bitnum++; midBit=0; } else if ((BinStream[i] <= low) && ((i-lastBit)>(*clk-tol))){ //low found and we are expecting a bar lastBit+=*clk; - //BitStream[bitnum] = 1- *invert; - //bitnum++; midBit=0; } else if ((BinStream[i]<=low) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){ //mid bar? midBit=1; - //BitStream[bitnum]= 1- *invert; - //bitnum++; } else if ((BinStream[i]>=high) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){ //mid bar? midBit=1; - //BitStream[bitnum]= *invert; - //bitnum++; } else if ((i-lastBit)>((*clk/2)+tol) && (midBit==0)){ //no mid bar found midBit=1; - //BitStream[bitnum]= BitStream[bitnum-1]; - //bitnum++; } else { //mid value found or no bar supposed to be here @@ -367,24 +418,19 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) //should have hit a high or low based on clock!! //debug //PrintAndLog("DEBUG - no wave in expected area - location: %d, expected: %d-%d, lastBit: %d - resetting search",i,(lastBit+(clk-((int)(tol)))),(lastBit+(clk+((int)(tol)))),lastBit); - //if (bitnum > 0){ - // BitStream[bitnum]=77; - // bitnum++; - //} errCnt++; lastBit+=*clk;//skip over until hit too many errors - if (errCnt > ((*size/1000))){ //allow 1 error for every 1000 samples else start over - errCnt=0; - // bitnum=0;//start over + if (errCnt > maxErr){ + //errCnt=0; break; } } } - if ((i-iii)>(500 * *clk)) break; //got enough bits + if ((i-iii)>(MaxBits * *clk)) break; //got enough bits } //we got more than 64 good bits and not all errors - if ((((i-iii)/ *clk) > (64+errCnt)) && (errCnt<(*size/1000))) { + if ((((i-iii)/ *clk) > (64)) && (errCnt<=maxErr)) { //possible good read if (errCnt==0){ bestStart=iii; @@ -398,9 +444,9 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) } } } - if (bestErrCnt (*clk-tol))){ //low found and we are expecting a bar lastBit+=*clk; - BinStream[bitnum] = 1-*invert; + BinStream[bitnum] = 1 - *invert; bitnum++; midBit=0; } else if ((BinStream[i]<=low) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){ @@ -442,11 +488,10 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) BinStream[bitnum]=77; bitnum++; } - lastBit+=*clk;//skip over error } } - if (bitnum >=400) break; + if (bitnum >= MaxBits) break; } *size=bitnum; } else{ @@ -552,114 +597,69 @@ int fskdemod(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t invert, uint8_t size = aggregate_bits(dest, size, rfLen, 192, invert, fchigh, fclow); return size; } + // 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 idx=0, size2=*size, startIdx=0; - // FSK demodulator - - *size = fskdemod(dest, size2,50,0,10,8); - - // final loop, go over previously decoded manchester data and decode into usable tag ID - // 111000 bit pattern represent start of frame, 01 pattern represents a 1 and 10 represents a 0 - uint8_t frame_marker_mask[] = {1,1,1,0,0,0}; - int numshifts = 0; - idx = 0; - //one scan - while( idx + sizeof(frame_marker_mask) < *size) { - // search for a start of frame marker - if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) - { // frame marker found - startIdx=idx; - idx+=sizeof(frame_marker_mask); - while(dest[idx] != dest[idx+1] && idx < *size-2) - { - // Keep going until next frame marker (or error) - // Shift in a bit. Start by shifting high registers - *hi2 = (*hi2<<1)|(*hi>>31); - *hi = (*hi<<1)|(*lo>>31); - //Then, shift in a 0 or one into low - if (dest[idx] && !dest[idx+1]) // 1 0 - *lo=(*lo<<1)|0; - else // 0 1 - *lo=(*lo<<1)|1; - numshifts++; - idx += 2; - } - // Hopefully, we read a tag and hit upon the next frame marker - if(idx + sizeof(frame_marker_mask) < *size) - { - if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) - { - //good return - *size=idx-startIdx; - return startIdx; - } - } - // reset - *hi2 = *hi = *lo = 0; - numshifts = 0; - }else { - idx++; - } - } - return -1; + size_t numStart=0, size2=*size, startIdx=0; + // FSK demodulator + *size = fskdemod(dest, size2,50,1,10,8); //fsk2a + if (*size < 96) return -2; + // 00011101 bit pattern represent start of frame, 01 pattern represents a 0 and 10 represents a 1 + uint8_t preamble[] = {0,0,0,1,1,1,0,1}; + // find bitstring in array + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -3; //preamble not found + + numStart = startIdx + sizeof(preamble); + // final loop, go over previously decoded FSK data and manchester decode into usable tag ID + for (size_t idx = numStart; (idx-numStart) < *size - sizeof(preamble); idx+=2){ + if (dest[idx] == dest[idx+1]){ + return -4; //not manchester data + } + *hi2 = (*hi2<<1)|(*hi>>31); + *hi = (*hi<<1)|(*lo>>31); + //Then, shift in a 0 or one into low + if (dest[idx] && !dest[idx+1]) // 1 0 + *lo=(*lo<<1)|1; + else // 0 1 + *lo=(*lo<<1)|0; + } + return (int)startIdx; } // loop to get raw paradox waveform then FSK demodulate the TAG ID from it -size_t ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo) +int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo) { - - size_t idx=0, size2=*size; + if (justNoise(dest, *size)) return -1; + + size_t numStart=0, size2=*size, startIdx=0; // FSK demodulator - - *size = fskdemod(dest, size2,50,1,10,8); - - // final loop, go over previously decoded manchester data and decode into usable tag ID - // 00001111 bit pattern represent start of frame, 01 pattern represents a 1 and 10 represents a 0 - uint8_t frame_marker_mask[] = {0,0,0,0,1,1,1,1}; - uint16_t numshifts = 0; - idx = 0; - //one scan - while( idx + sizeof(frame_marker_mask) < *size) { - // search for a start of frame marker - if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) - { // frame marker found - size2=idx; - idx+=sizeof(frame_marker_mask); - while(dest[idx] != dest[idx+1] && idx < *size-2) - { - // Keep going until next frame marker (or error) - // Shift in a bit. Start by shifting high registers - *hi2 = (*hi2<<1)|(*hi>>31); - *hi = (*hi<<1)|(*lo>>31); - //Then, shift in a 0 or one into low - if (dest[idx] && !dest[idx+1]) // 1 0 - *lo=(*lo<<1)|1; - else // 0 1 - *lo=(*lo<<1)|0; - numshifts++; - idx += 2; - } - // Hopefully, we read a tag and hit upon the next frame marker and got enough bits - if(idx + sizeof(frame_marker_mask) < *size && numshifts > 40) - { - if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) - { - //good return - return start grid position and bits found - *size = ((numshifts*2)+8); - return size2; - } - } - // reset - *hi2 = *hi = *lo = 0; - numshifts = 0; - }else { - idx++; - } + *size = fskdemod(dest, size2,50,1,10,8); //fsk2a + if (*size < 96) return -2; + + // 00001111 bit pattern represent start of frame, 01 pattern represents a 0 and 10 represents a 1 + uint8_t preamble[] = {0,0,0,0,1,1,1,1}; + + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -3; //preamble not found + + numStart = startIdx + sizeof(preamble); + // final loop, go over previously decoded FSK data and manchester decode into usable tag ID + for (size_t idx = numStart; (idx-numStart) < *size - sizeof(preamble); idx+=2){ + if (dest[idx] == dest[idx+1]) + return -4; //not manchester data + *hi2 = (*hi2<<1)|(*hi>>31); + *hi = (*hi<<1)|(*lo>>31); + //Then, shift in a 0 or one into low + if (dest[idx] && !dest[idx+1]) // 1 0 + *lo=(*lo<<1)|1; + else // 0 1 + *lo=(*lo<<1)|0; } - return 0; + return (int)startIdx; } uint32_t bytebits_to_byte(uint8_t* src, size_t numbits) @@ -675,20 +675,12 @@ uint32_t bytebits_to_byte(uint8_t* src, size_t numbits) int IOdemodFSK(uint8_t *dest, size_t size) { - static const uint8_t THRESHOLD = 129; - uint32_t idx=0; + if (justNoise(dest, size)) return -1; //make sure buffer has data - if (size < 66) return -1; - //test samples are not just noise - uint8_t justNoise = 1; - for(idx=0;idx< size && justNoise ;idx++){ - justNoise = dest[idx] < THRESHOLD; - } - if(justNoise) return 0; - + if (size < 66*64) return -2; // FSK demodulator - size = fskdemod(dest, size, 64, 1, 10, 8); // RF/64 and invert - if (size < 65) return -1; //did we get a good demod? + size = fskdemod(dest, size, 64, 1, 10, 8); // FSK2a RF/64 + if (size < 65) return -3; //did we get a good demod? //Index map //0 10 20 30 40 50 60 //| | | | | | | @@ -698,31 +690,17 @@ int IOdemodFSK(uint8_t *dest, size_t size) // //XSF(version)facility:codeone+codetwo //Handle the data - uint8_t mask[] = {0,0,0,0,0,0,0,0,0,1}; - for( idx=0; idx < (size - 65); idx++) { - if ( memcmp(dest + idx, mask, sizeof(mask))==0) { - //frame marker found - if (!dest[idx+8] && dest[idx+17]==1 && dest[idx+26]==1 && dest[idx+35]==1 && dest[idx+44]==1 && dest[idx+53]==1){ - //confirmed proper separator bits found - //return start position - return (int) idx; - } - } - } - return 0; -} - -// by marshmellow -// pass bits to be tested in bits, length bits passed in bitLen, and parity type (even=0 | odd=1) in pType -// returns 1 if passed -uint8_t parityTest(uint32_t bits, uint8_t bitLen, uint8_t pType) -{ - uint8_t ans = 0; - for (uint8_t i = 0; i < bitLen; i++){ - ans ^= ((bits >> i) & 1); + size_t startIdx = 0; + uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,1}; + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), &size, &startIdx); + if (errChk == 0) return -4; //preamble not found + + if (!dest[startIdx+8] && dest[startIdx+17]==1 && dest[startIdx+26]==1 && dest[startIdx+35]==1 && dest[startIdx+44]==1 && dest[startIdx+53]==1){ + //confirmed proper separator bits found + //return start position + return (int) startIdx; } - //PrintAndLog("DEBUG: ans: %d, ptype: %d",ans,pType); - return (ans == pType); + return -5; } // by marshmellow @@ -735,7 +713,7 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p for (int word = 0; word < (bLen); word+=pLen){ for (int bit=0; bit < pLen; bit++){ parityWd = (parityWd << 1) | BitStream[startIdx+word+bit]; - BitStream[j++] = (BitStream[startIdx+word+bit]); + BitStream[j++] = (BitStream[startIdx+word+bit]); } j--; // if parity fails then return 0 @@ -750,99 +728,112 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p // by marshmellow // FSK Demod then try to locate an AWID ID -int AWIDdemodFSK(uint8_t *dest, size_t size) +int AWIDdemodFSK(uint8_t *dest, size_t *size) { - static const uint8_t THRESHOLD = 123; - uint32_t idx=0, idx2=0; - //make sure buffer has data - if (size < 96*50) return -1; - //test samples are not just noise - uint8_t justNoise = 1; - for(idx=0; idx < size && justNoise ;idx++){ - justNoise = dest[idx] < THRESHOLD; - } - if(justNoise) return -2; + //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); // RF/64 and invert - if (size < 96) return -3; //did we get a good demod? - - uint8_t mask[] = {0,0,0,0,0,0,0,1}; - for( idx=0; idx < (size - 96); idx++) { - if ( memcmp(dest + idx, mask, sizeof(mask))==0) { - // frame marker found - //return ID start index - if (idx2 == 0) idx2=idx; - else if(idx-idx2==96) return idx2; - else return -5; - - // should always get 96 bits if it is awid - } - } - //never found mask - return -4; + *size = fskdemod(dest, *size, 50, 1, 10, 8); // fsk2a RF/50 + if (*size < 96) return -3; //did we get a good demod? + + uint8_t preamble[] = {0,0,0,0,0,0,0,1}; + size_t startIdx = 0; + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -4; //preamble not found + if (*size != 96) return -5; + return (int)startIdx; } // by marshmellow // FSK Demod then try to locate an Farpointe Data (pyramid) ID -int PyramiddemodFSK(uint8_t *dest, size_t size) +int PyramiddemodFSK(uint8_t *dest, size_t *size) { - static const uint8_t THRESHOLD = 123; - uint32_t idx=0, idx2=0; - // size_t size2 = size; - //make sure buffer has data - if (size < 128*50) return -5; - //test samples are not just noise - uint8_t justNoise = 1; - for(idx=0; idx < size && justNoise ;idx++){ - justNoise = dest[idx] < THRESHOLD; - } - if(justNoise) return -1; + //make sure buffer has data + if (*size < 128*50) return -5; - // FSK demodulator - size = fskdemod(dest, size, 50, 1, 10, 8); // RF/64 and invert - if (size < 128) return -2; //did we get a good demod? - - uint8_t mask[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1}; - for( idx=0; idx < (size - 128); idx++) { - if ( memcmp(dest + idx, mask, sizeof(mask))==0) { - // frame marker found - if (idx2==0) idx2=idx; - else if (idx-idx2==128) return idx2; - else return -3; - } - } - //never found mask - return -4; + //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? + + uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1}; + size_t startIdx = 0; + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -4; //preamble not found + if (*size != 128) return -3; + return (int)startIdx; } +uint8_t DetectCleanAskWave(uint8_t dest[], size_t size, int high, int low) +{ + uint8_t allPeaks=1; + uint16_t cntPeaks=0; + for (size_t i=20; i<255; i++){ + if (dest[i]>low && dest[i]190) return 1; + } + return allPeaks; +} + // by marshmellow // not perfect especially with lower clocks or VERY good antennas (heavy wave clipping) // maybe somehow adjust peak trimming value based on samples to fix? -int DetectASKClock(uint8_t dest[], size_t size, int clock) +// return start index of best starting position for that clock and return clock (by reference) +int DetectASKClock(uint8_t dest[], size_t size, int *clock, int maxErr) { int i=0; int clk[]={8,16,32,40,50,64,100,128,256}; int loopCnt = 256; //don't need to loop through entire array... + if (size == 0) return -1; if (size> 8; + uint8_t fc2 = fcTest & 0xFF; + + for (i=0; i<8; i++){ + if (clk[i] == fc1) { + *clock=fc1; + return 0; + } + if (clk[i] == fc2) { + *clock=fc2; + return 0; + } + } + } + int ii; int clkCnt; int tol = 0; int bestErr[]={1000,1000,1000,1000,1000,1000,1000,1000,1000}; + int bestStart[]={0,0,0,0,0,0,0,0,0}; int errCnt=0; //test each valid clock from smallest to greatest to see which lines up - for(clkCnt=0; clkCnt < 8; ++clkCnt){ + for(clkCnt=0; clkCnt < 8; clkCnt++){ if (clk[clkCnt] == 32){ tol=1; }else{ @@ -850,7 +841,7 @@ int DetectASKClock(uint8_t dest[], size_t size, int clock) } bestErr[clkCnt]=1000; //try lining up the peaks by moving starting point (try first 256) - for (ii=0; ii < loopCnt; ++ii){ + for (ii=0; ii < loopCnt; ii++){ if ((dest[ii] >= peak) || (dest[ii] <= low)){ errCnt=0; // now that we have the first one lined up test rest of wave array @@ -865,9 +856,15 @@ int DetectASKClock(uint8_t dest[], size_t size, int clock) //if we found no errors then we can stop here // this is correct one - return this clock //PrintAndLog("DEBUG: clk %d, err %d, ii %d, i %d",clk[clkCnt],errCnt,ii,i); - if(errCnt==0 && clkCnt<6) return clk[clkCnt]; + if(errCnt==0 && clkCnt<6) { + *clock = clk[clkCnt]; + return ii; + } //if we found errors see if it is lowest so far and save it as best run - if(errCntmaxErr) return -1; + *clock=clk[best]; + return bestStart[best]; } +//by marshmellow +//detect psk clock by reading each phase shift +// a phase shift is determined by measuring the sample length of each wave +int DetectPSKClock(uint8_t dest[], size_t size, int clock) +{ + uint8_t clk[]={255,16,32,40,50,64,100,128,255}; //255 is not a valid clock + uint16_t loopCnt = 4096; //don't need to loop through entire array... + if (size == 0) return 0; + if (size= dest[i+2]){ + if (waveStart == 0) { + waveStart = i+1; + //PrintAndLog("DEBUG: waveStart: %d",waveStart); + } else { + waveEnd = i+1; + //PrintAndLog("DEBUG: waveEnd: %d",waveEnd); + waveLenCnt = waveEnd-waveStart; + if (waveLenCnt > fc){ + firstFullWave = waveStart; + fullWaveLen=waveLenCnt; + break; + } + waveStart=0; + } + } + } + //PrintAndLog("DEBUG: firstFullWave: %d, waveLen: %d",firstFullWave,fullWaveLen); + + //test each valid clock from greatest to smallest to see which lines up + for(clkCnt=7; clkCnt >= 1 ; clkCnt--){ + lastClkBit = firstFullWave; //set end of wave as clock align + waveStart = 0; + errCnt=0; + peakcnt=0; + //PrintAndLog("DEBUG: clk: %d, lastClkBit: %d",clk[clkCnt],lastClkBit); + + for (i = firstFullWave+fullWaveLen-1; i < loopCnt-2; i++){ + //top edge of wave = start of new wave + if (dest[i] < dest[i+1] && dest[i+1] >= dest[i+2]){ + if (waveStart == 0) { + waveStart = i+1; + waveLenCnt=0; + } else { //waveEnd + waveEnd = i+1; + waveLenCnt = waveEnd-waveStart; + if (waveLenCnt > fc){ + //if this wave is a phase shift + //PrintAndLog("DEBUG: phase shift at: %d, len: %d, nextClk: %d, ii: %d, fc: %d",waveStart,waveLenCnt,lastClkBit+clk[clkCnt]-tol,ii+1,fc); + if (i+1 >= lastClkBit + clk[clkCnt] - tol){ //should be a clock bit + peakcnt++; + lastClkBit+=clk[clkCnt]; + } else if (i lastClkBit + clk[clkCnt] + tol + fc){ + lastClkBit+=clk[clkCnt]; //no phase shift but clock bit + } + waveStart=i+1; + } + } + } + if (errCnt == 0){ + return clk[clkCnt]; + } + if (errCnt <= bestErr[clkCnt]) bestErr[clkCnt]=errCnt; + if (peakcnt > peaksdet[clkCnt]) peaksdet[clkCnt]=peakcnt; + } + //all tested with errors + //return the highest clk with the most peaks found + uint8_t best=7; + for (i=7; i>=1; i--){ + if (peaksdet[i] > peaksdet[best]) { + best = i; + } + //PrintAndLog("DEBUG: Clk: %d, peaks: %d, errs: %d, bestClk: %d",clk[iii],peaksdet[iii],bestErr[iii],clk[best]); + } + return clk[best]; +} //by marshmellow -//detect psk clock by reading #peaks vs no peaks(or errors) -int DetectpskNRZClock(uint8_t dest[], size_t size, int clock) +//detect nrz clock by reading #peaks vs no peaks(or errors) +int DetectNRZClock(uint8_t dest[], size_t size, int clock) { - int i=0; - int clk[]={16,32,40,50,64,100,128,256}; - int loopCnt = 2048; //don't need to loop through entire array... - if (size= peak) || (dest[ii] <= low)){ - errCnt=0; - peakcnt=0; - // now that we have the first one lined up test rest of wave array - for (i=0; i < ((int)((size-ii-tol)/clk[clkCnt])-1); ++i){ - if (dest[ii+(i*clk[clkCnt])]>=peak || dest[ii+(i*clk[clkCnt])]<=low){ - peakcnt++; - }else if(dest[ii+(i*clk[clkCnt])-tol]>=peak || dest[ii+(i*clk[clkCnt])-tol]<=low){ - peakcnt++; - }else if(dest[ii+(i*clk[clkCnt])+tol]>=peak || dest[ii+(i*clk[clkCnt])+tol]<=low){ - peakcnt++; - }else{ //error no peak detected - errCnt++; - } - } - if(peakcnt>peaksdet[clkCnt]) { - peaksdet[clkCnt]=peakcnt; - bestErr[clkCnt]=errCnt; - } - } - } - } - int iii=0; - int best=0; - //int ratio2; //debug - int ratio; - //int bits; - for (iii=0; iii < 7; ++iii){ - ratio=1000; - //ratio2=1000; //debug - //bits=size/clk[iii]; //debug - if (peaksdet[iii] > 0){ - ratio=bestErr[iii]/peaksdet[iii]; - if (((bestErr[best]/peaksdet[best]) > (ratio)+1)){ - best = iii; - } - //ratio2=bits/peaksdet[iii]; //debug + //PrintAndLog("DEBUG: peak: %d, low: %d",peak,low); + int ii; + uint8_t clkCnt; + uint8_t tol = 0; + int peakcnt=0; + int peaksdet[]={0,0,0,0,0,0,0,0}; + int maxPeak=0; + //test for large clipped waves + for (i=0; i= peak || dest[i] <= low){ + peakcnt++; + } else { + if (peakcnt>0 && maxPeak < peakcnt){ + maxPeak = peakcnt; + } + peakcnt=0; + } + } + peakcnt=0; + //test each valid clock from smallest to greatest to see which lines up + for(clkCnt=0; clkCnt < 8; ++clkCnt){ + //ignore clocks smaller than largest peak + if (clk[clkCnt]= peak) || (dest[ii] <= low)){ + peakcnt=0; + // now that we have the first one lined up test rest of wave array + for (i=0; i < ((int)((size-ii-tol)/clk[clkCnt])-1); ++i){ + if (dest[ii+(i*clk[clkCnt])]>=peak || dest[ii+(i*clk[clkCnt])]<=low){ + peakcnt++; + } + } + if(peakcnt>peaksdet[clkCnt]) { + peaksdet[clkCnt]=peakcnt; + } + } + } + } + int iii=7; + int best=0; + for (iii=7; iii > 0; iii--){ + if (peaksdet[iii] > peaksdet[best]){ + best = iii; + } + //PrintAndLog("DEBUG: Clk: %d, peaks: %d, errs: %d, bestClk: %d",clk[iii],peaksdet[iii],bestErr[iii],clk[best]); + } + return clk[best]; +} + +// by marshmellow +// convert psk1 demod to psk2 demod +// only transition waves are 1s +void psk1TOpsk2(uint8_t *BitStream, size_t size) +{ + size_t i=1; + uint8_t lastBit=BitStream[0]; + for (; ilow){ - BitStream[i]=low+8; - gap--; - } - if (gap == 0){ - newLow=0; - gap=4; - } - }else if (newHigh == 1){ - if (BitStream[i]= high) newHigh=1; + BitStream[i]=phase; } return; } - -//redesigned by marshmellow adjusted from existing decode functions -//indala id decoding - only tested on 26 bit tags, but attempted to make it work for more +// redesigned by marshmellow adjusted from existing decode functions +// indala id decoding - only tested on 26 bit tags, but attempted to make it work for more int indala26decode(uint8_t *bitStream, size_t *size, uint8_t *invert) { //26 bit 40134 format (don't know other formats) @@ -1064,141 +1149,168 @@ int indala26decode(uint8_t *bitStream, size_t *size, uint8_t *invert) return 1; } - -//by marshmellow - demodulate PSK1 wave or NRZ wave (both similar enough) -//peaks switch bit (high=1 low=0) each clock cycle = 1 bit determined by last peak -int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert) +// by marshmellow - demodulate NRZ wave (both similar enough) +// peaks invert bit (high=1 low=0) each clock cycle = 1 bit determined by last peak +// there probably is a much simpler way to do this.... +int nrzRawDemod(uint8_t *dest, size_t *size, int *clk, int *invert, int maxErr) { - pskCleanWave(dest,*size); - int clk2 = DetectpskNRZClock(dest, *size, *clk); - *clk=clk2; - uint32_t i; - int high, low, ans; - ans = getHiLo(dest, 1260, &high, &low, 75, 80); //25% fuzz on high 20% fuzz on low - if (ans<1) return -2; //just noise - uint32_t gLen = *size; - //PrintAndLog("DEBUG - valid high: %d - valid low: %d",high,low); - int lastBit = 0; //set first clock check - uint32_t bitnum = 0; //output counter - uint8_t tol = 1; //clock tolerance adjust - waves will be accepted as within the clock if they fall + or - this value + clock from last valid wave - if (*clk==32) tol = 2; //clock tolerance may not be needed anymore currently set to + or - 1 but could be increased for poor waves or removed entirely - uint32_t iii = 0; - uint8_t errCnt =0; - uint32_t bestStart = *size; - uint32_t maxErr = (*size/1000); - uint32_t bestErrCnt = maxErr; - //uint8_t midBit=0; - uint8_t curBit=0; - uint8_t bitHigh=0; - uint8_t ignorewin=*clk/8; - //PrintAndLog("DEBUG - lastbit - %d",lastBit); - //loop to find first wave that works - align to clock - for (iii=0; iii < gLen; ++iii){ - if ((dest[iii]>=high) || (dest[iii]<=low)){ - lastBit=iii-*clk; - //loop through to see if this start location works - for (i = iii; i < *size; ++i) { - //if we found a high bar and we are at a clock bit - if ((dest[i]>=high ) && (i>=lastBit+*clk-tol && i<=lastBit+*clk+tol)){ - bitHigh=1; - lastBit+=*clk; - ignorewin=*clk/8; - bitnum++; - //else if low bar found and we are at a clock point - }else if ((dest[i]<=low ) && (i>=lastBit+*clk-tol && i<=lastBit+*clk+tol)){ - bitHigh=1; - lastBit+=*clk; - ignorewin=*clk/8; - bitnum++; - //else if no bars found - }else if(dest[i] < high && dest[i] > low) { - if (ignorewin==0){ - bitHigh=0; - }else ignorewin--; - //if we are past a clock point - if (i >= lastBit+*clk+tol){ //clock val - lastBit+=*clk; - bitnum++; - } - //else if bar found but we are not at a clock bit and we did not just have a clock bit - }else if ((dest[i]>=high || dest[i]<=low) && (ilastBit+*clk+tol) && (bitHigh==0)){ - //error bar found no clock... - errCnt++; - } - if (bitnum>=1000) break; - } - //we got more than 64 good bits and not all errors - if ((bitnum > (64+errCnt)) && (errCnt < (maxErr))) { - //possible good read - if (errCnt == 0){ - bestStart = iii; - bestErrCnt = errCnt; - break; //great read - finish - } - if (errCnt < bestErrCnt){ //set this as new best run - bestErrCnt = errCnt; - bestStart = iii; - } - } - } - } - if (bestErrCnt < maxErr){ - //best run is good enough set to best run and set overwrite BinStream - iii=bestStart; - lastBit=bestStart-*clk; - bitnum=0; - for (i = iii; i < *size; ++i) { - //if we found a high bar and we are at a clock bit - if ((dest[i] >= high ) && (i>=lastBit+*clk-tol && i<=lastBit+*clk+tol)){ - bitHigh=1; - lastBit+=*clk; - curBit=1-*invert; - dest[bitnum]=curBit; - ignorewin=*clk/8; - bitnum++; - //else if low bar found and we are at a clock point - }else if ((dest[i]<=low ) && (i>=lastBit+*clk-tol && i<=lastBit+*clk+tol)){ - bitHigh=1; - lastBit+=*clk; - curBit=*invert; - dest[bitnum]=curBit; - ignorewin=*clk/8; - bitnum++; - //else if no bars found - }else if(dest[i]low) { - if (ignorewin==0){ - bitHigh=0; - }else ignorewin--; - //if we are past a clock point - if (i>=lastBit+*clk+tol){ //clock val - lastBit+=*clk; - dest[bitnum]=curBit; - bitnum++; - } - //else if bar found but we are not at a clock bit and we did not just have a clock bit - }else if ((dest[i]>=high || dest[i]<=low) && ((ilastBit+*clk+tol)) && (bitHigh==0)){ - //error bar found no clock... - bitHigh=1; - dest[bitnum]=77; - bitnum++; - errCnt++; - } - if (bitnum >=1000) break; - } - *size=bitnum; - } else{ - *size=bitnum; - *clk=bestStart; - return -1; - } + if (justNoise(dest, *size)) return -1; + *clk = DetectNRZClock(dest, *size, *clk); + if (*clk==0) return -2; + uint32_t i; + int high, low, ans; + ans = getHiLo(dest, 1260, &high, &low, 75, 75); //25% fuzz on high 25% fuzz on low + if (ans<1) return -2; //just noise + uint32_t gLen = 256; + if (gLen>*size) gLen = *size; + int lastBit = 0; //set first clock check + uint32_t bitnum = 0; //output counter + uint8_t tol = 1; //clock tolerance adjust - waves will be accepted as within the clock if they fall + or - this value + clock from last valid wave + uint32_t iii = 0; + uint16_t errCnt =0; + uint16_t MaxBits = 1000; + uint32_t bestErrCnt = maxErr+1; + uint32_t bestPeakCnt = 0; + uint32_t bestPeakStart=0; + uint8_t curBit=0; + uint8_t bitHigh=0; + uint8_t errBitHigh=0; + uint16_t peakCnt=0; + uint8_t ignoreWindow=4; + uint8_t ignoreCnt=ignoreWindow; //in case of noice near peak + //loop to find first wave that works - align to clock + for (iii=0; iii < gLen; ++iii){ + if ((dest[iii]>=high) || (dest[iii]<=low)){ + lastBit=iii-*clk; + peakCnt=0; + errCnt=0; + bitnum=0; + //loop through to see if this start location works + for (i = iii; i < *size; ++i) { + //if we found a high bar and we are at a clock bit + if ((dest[i]>=high ) && (i>=lastBit+*clk-tol && i<=lastBit+*clk+tol)){ + bitHigh=1; + lastBit+=*clk; + bitnum++; + peakCnt++; + errBitHigh=0; + ignoreCnt=ignoreWindow; + //else if low bar found and we are at a clock point + }else if ((dest[i]<=low ) && (i>=lastBit+*clk-tol && i<=lastBit+*clk+tol)){ + bitHigh=1; + lastBit+=*clk; + bitnum++; + peakCnt++; + errBitHigh=0; + ignoreCnt=ignoreWindow; + //else if no bars found + }else if(dest[i] < high && dest[i] > low) { + if (ignoreCnt==0){ + bitHigh=0; + if (errBitHigh==1){ + errCnt++; + } + errBitHigh=0; + } else { + ignoreCnt--; + } + //if we are past a clock point + if (i >= lastBit+*clk+tol){ //clock val + lastBit+=*clk; + bitnum++; + } + //else if bar found but we are not at a clock bit and we did not just have a clock bit + }else if ((dest[i]>=high || dest[i]<=low) && (ilastBit+*clk+tol) && (bitHigh==0)){ + //error bar found no clock... + errBitHigh=1; + } + if (bitnum>=MaxBits) break; + } + //we got more than 64 good bits and not all errors + if (bitnum > (64) && (errCnt <= (maxErr))) { + //possible good read + if (errCnt == 0){ + //bestStart = iii; + bestErrCnt = errCnt; + bestPeakCnt = peakCnt; + bestPeakStart = iii; + break; //great read - finish + } + if (errCnt < bestErrCnt){ //set this as new best run + bestErrCnt = errCnt; + //bestStart = iii; + } + if (peakCnt > bestPeakCnt){ + bestPeakCnt=peakCnt; + bestPeakStart=iii; + } + } + } + } + //PrintAndLog("DEBUG: bestErrCnt: %d, maxErr: %d, bestStart: %d, bestPeakCnt: %d, bestPeakStart: %d",bestErrCnt,maxErr,bestStart,bestPeakCnt,bestPeakStart); + if (bestErrCnt <= maxErr){ + //best run is good enough set to best run and set overwrite BinStream + iii=bestPeakStart; + lastBit=bestPeakStart-*clk; + bitnum=0; + for (i = iii; i < *size; ++i) { + //if we found a high bar and we are at a clock bit + if ((dest[i] >= high ) && (i>=lastBit+*clk-tol && i<=lastBit+*clk+tol)){ + bitHigh=1; + lastBit+=*clk; + curBit=1-*invert; + dest[bitnum]=curBit; + bitnum++; + errBitHigh=0; + ignoreCnt=ignoreWindow; + //else if low bar found and we are at a clock point + }else if ((dest[i]<=low ) && (i>=lastBit+*clk-tol && i<=lastBit+*clk+tol)){ + bitHigh=1; + lastBit+=*clk; + curBit=*invert; + dest[bitnum]=curBit; + bitnum++; + errBitHigh=0; + ignoreCnt=ignoreWindow; + //else if no bars found + }else if(dest[i]low) { + if (ignoreCnt==0){ + bitHigh=0; + //if peak is done was it an error peak? + if (errBitHigh==1){ + dest[bitnum]=77; + bitnum++; + errCnt++; + } + errBitHigh=0; + } else { + ignoreCnt--; + } + //if we are past a clock point + if (i>=lastBit+*clk+tol){ //clock val + lastBit+=*clk; + dest[bitnum]=curBit; + bitnum++; + } + //else if bar found but we are not at a clock bit and we did not just have a clock bit + }else if ((dest[i]>=high || dest[i]<=low) && ((ilastBit+*clk+tol)) && (bitHigh==0)){ + //error bar found no clock... + errBitHigh=1; + } + if (bitnum >= MaxBits) break; + } + *size=bitnum; + } else{ + *size=bitnum; + return -1; + } - if (bitnum>16){ - *size=bitnum; - } else return -1; - return errCnt; + if (bitnum>16){ + *size=bitnum; + } else return -1; + return errCnt; } - //by marshmellow //detects the bit clock for FSK given the high and low Field Clocks uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fcLow) @@ -1212,6 +1324,7 @@ uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fc uint16_t rfCounter = 0; uint8_t firstBitFnd = 0; size_t i; + if (size == 0) return 0; uint8_t fcTol = (uint8_t)(0.5+(float)(fcHigh-fcLow)/2); rfLensFnd=0; @@ -1234,7 +1347,7 @@ uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fc fcCounter = fcLow; else //set it to the large fc fcCounter = fcHigh; - + //look for bit clock (rf/xx) if ((fcCounterlastFCcnt)){ //not the same size as the last wave - start of new bit sequence @@ -1308,7 +1421,8 @@ uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fc //by marshmellow //countFC is to detect the field clock lengths. //counts and returns the 2 most common wave lengths -uint16_t countFC(uint8_t *BitStream, size_t size) +//mainly used for FSK field clock detection +uint16_t countFC(uint8_t *BitStream, size_t size, uint8_t *mostFC) { uint8_t fcLens[] = {0,0,0,0,0,0,0,0,0,0}; uint16_t fcCnts[] = {0,0,0,0,0,0,0,0,0,0}; @@ -1316,7 +1430,8 @@ uint16_t countFC(uint8_t *BitStream, size_t size) uint8_t lastFCcnt=0; uint32_t fcCounter = 0; size_t i; - + if (size == 0) return 0; + // prime i to first up transition for (i = 1; i < size-1; i++) if (BitStream[i] > BitStream[i-1] && BitStream[i] >= BitStream[i+1]) @@ -1379,7 +1494,8 @@ uint16_t countFC(uint8_t *BitStream, size_t size) fcH=fcLens[best2]; fcL=fcLens[best1]; } - + + *mostFC=fcLens[best1]; // TODO: take top 3 answers and compare to known Field clocks to get top 2 uint16_t fcs = (((uint16_t)fcH)<<8) | fcL; @@ -1387,3 +1503,152 @@ uint16_t countFC(uint8_t *BitStream, size_t size) return fcs; } + +//by marshmellow +//countPSK_FC is to detect the psk carrier clock length. +//counts and returns the 1 most common wave length +uint8_t countPSK_FC(uint8_t *BitStream, size_t size) +{ + uint8_t fcLens[] = {0,0,0,0,0,0,0,0,0,0}; + uint16_t fcCnts[] = {0,0,0,0,0,0,0,0,0,0}; + uint8_t fcLensFnd = 0; + uint32_t fcCounter = 0; + size_t i; + if (size == 0) return 0; + + // prime i to first up transition + for (i = 1; i < size-1; i++) + if (BitStream[i] > BitStream[i-1] && BitStream[i] >= BitStream[i+1]) + break; + + for (; i < size-1; i++){ + if (BitStream[i] > BitStream[i-1] && BitStream[i] >= BitStream[i+1]){ + // new up transition + fcCounter++; + + // save last field clock count (fc/xx) + // find which fcLens to save it to: + for (int ii=0; ii<10; ii++){ + if (fcLens[ii]==fcCounter){ + fcCnts[ii]++; + fcCounter=0; + break; + } + } + if (fcCounter>0 && fcLensFnd<10){ + //add new fc length + fcCnts[fcLensFnd]++; + fcLens[fcLensFnd++]=fcCounter; + } + fcCounter=0; + } else { + // count sample + fcCounter++; + } + } + + uint8_t best1=9; + uint16_t maxCnt1=0; + // go through fclens and find which ones are bigest + for (i=0; i<10; i++){ + //PrintAndLog("DEBUG: FC %d, Cnt %d",fcLens[i],fcCnts[i]); + // get the best FC value + if (fcCnts[i]>maxCnt1) { + maxCnt1=fcCnts[i]; + best1=i; + } + } + return fcLens[best1]; +} + +//by marshmellow - demodulate PSK1 wave +//uses wave lengths (# Samples) +int pskRawDemod(uint8_t dest[], size_t *size, int *clock, int *invert) +{ + uint16_t loopCnt = 4096; //don't need to loop through entire array... + if (size == 0) return -1; + if (*size= dest[i+2]){ + if (waveStart == 0) { + waveStart = i+1; + avgWaveVal=dest[i+1]; + //PrintAndLog("DEBUG: waveStart: %d",waveStart); + } else { + waveEnd = i+1; + //PrintAndLog("DEBUG: waveEnd: %d",waveEnd); + waveLenCnt = waveEnd-waveStart; + lastAvgWaveVal = avgWaveVal/waveLenCnt; + if (waveLenCnt > fc){ + firstFullWave = waveStart; + fullWaveLen=waveLenCnt; + //if average wave value is > graph 0 then it is an up wave or a 1 + if (lastAvgWaveVal > 128) curPhase^=1; + break; + } + waveStart=0; + avgWaveVal=0; + } + } + avgWaveVal+=dest[i+1]; + } + //PrintAndLog("DEBUG: firstFullWave: %d, waveLen: %d",firstFullWave,fullWaveLen); + lastClkBit = firstFullWave; //set start of wave as clock align + waveStart = 0; + errCnt=0; + size_t numBits=0; + //PrintAndLog("DEBUG: clk: %d, lastClkBit: %d", *clock, lastClkBit); + + for (i = firstFullWave+fullWaveLen-1; i < *size-3; i++){ + //top edge of wave = start of new wave + if (dest[i]+fc < dest[i+1] && dest[i+1] >= dest[i+2]){ + if (waveStart == 0) { + waveStart = i+1; + waveLenCnt=0; + avgWaveVal = dest[i+1]; + } else { //waveEnd + waveEnd = i+1; + waveLenCnt = waveEnd-waveStart; + lastAvgWaveVal = avgWaveVal/waveLenCnt; + if (waveLenCnt > fc){ + //PrintAndLog("DEBUG: avgWaveVal: %d, waveSum: %d",lastAvgWaveVal,avgWaveVal); + //if this wave is a phase shift + //PrintAndLog("DEBUG: phase shift at: %d, len: %d, nextClk: %d, i: %d, fc: %d",waveStart,waveLenCnt,lastClkBit+*clock-tol,i+1,fc); + if (i+1 >= lastClkBit + *clock - tol){ //should be a clock bit + curPhase^=1; + dest[numBits] = curPhase; + numBits++; + lastClkBit += *clock; + } else if (i lastClkBit + *clock + tol + fc){ + lastClkBit += *clock; //no phase shift but clock bit + dest[numBits] = curPhase; + numBits++; + } + avgWaveVal=0; + waveStart=i+1; + } + } + avgWaveVal+=dest[i+1]; + } + *size = numBits; + return errCnt; +}