X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/6e98444637baaa183812fad93cd7c03d645ba95e..refs/pull/148/head:/common/lfdemod.c?ds=inline diff --git a/common/lfdemod.c b/common/lfdemod.c index c00222b3..063c8a74 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -81,10 +81,8 @@ uint8_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_ // otherwise could be a void with no arguments //set defaults uint32_t i = 0; - if (BitStream[1]>1){ //allow only 1s and 0s - // PrintAndLog("no data found"); - return 0; - } + if (BitStream[1]>1) return 0; //allow only 1s and 0s + // 111111111 bit pattern represent start of frame // include 0 in front to help get start pos uint8_t preamble[] = {0,1,1,1,1,1,1,1,1,1}; @@ -114,12 +112,12 @@ uint8_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_ return 0; } -// demodulates strong heavily clipped samples +//by marshmellow +//demodulates strong heavily clipped samples int cleanAskRawDemod(uint8_t *BinStream, size_t *size, int clk, int invert, int high, int low) { size_t bitCnt=0, smplCnt=0, errCnt=0; uint8_t waveHigh = 0; - //PrintAndLog("clk: %d", clk); for (size_t i=0; i < *size; i++){ if (BinStream[i] >= high && waveHigh){ smplCnt++; @@ -130,7 +128,7 @@ int cleanAskRawDemod(uint8_t *BinStream, size_t *size, int clk, int invert, int if (smplCnt > clk-(clk/4)-1) { //full clock if (smplCnt > clk + (clk/4)+1) { //too many samples errCnt++; - BinStream[bitCnt++]=77; + BinStream[bitCnt++]=7; } else if (waveHigh) { BinStream[bitCnt++] = invert; BinStream[bitCnt++] = invert; @@ -166,52 +164,81 @@ int cleanAskRawDemod(uint8_t *BinStream, size_t *size, int clk, int invert, int } //by marshmellow -//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 maxErr) +void askAmp(uint8_t *BitStream, size_t size) { - size_t i; + for(size_t i = 1; i=30) //large jump up + BitStream[i]=127; + else if(BitStream[i]-BitStream[i-1]<=-20) //large jump down + BitStream[i]=-127; + } + return; +} + +//by marshmellow +//attempts to demodulate ask modulations, askType == 0 for ask/raw, askType==1 for ask/manchester +int askdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert, int maxErr, uint8_t amp, uint8_t askType) +{ + if (*size==0) return -1; int start = DetectASKClock(BinStream, *size, clk, maxErr); //clock default if (*clk==0 || start < 0) return -3; - if (*invert != 1) *invert=0; + if (*invert != 1) *invert = 0; + if (amp==1) askAmp(BinStream, *size); + uint8_t initLoopMax = 255; if (initLoopMax > *size) initLoopMax = *size; // Detect high and lows - // 25% fuzz in case highs and lows aren't clipped [marshmellow] + //25% clip in case highs and lows aren't clipped [marshmellow] int high, low; - if (getHiLo(BinStream, initLoopMax, &high, &low, 75, 75) < 1) return -2; //just noise + if (getHiLo(BinStream, initLoopMax, &high, &low, 75, 75) < 1) + return -2; //just noise + size_t errCnt = 0; // if clean clipped waves detected run alternate demod if (DetectCleanAskWave(BinStream, *size, high, low)) { - cleanAskRawDemod(BinStream, size, *clk, *invert, high, low); - return manrawdecode(BinStream, size); + errCnt = cleanAskRawDemod(BinStream, size, *clk, *invert, high, low); + if (askType) //askman + return manrawdecode(BinStream, size, 0); + else //askraw + return errCnt; } - // PrintAndLog("DEBUG - valid high: %d - valid low: %d",high,low); - int lastBit; //set first clock check - uint16_t bitnum = 0; //output counter + int lastBit; //set first clock check - can go negative + size_t i, bitnum = 0; //output counter + uint8_t midBit = 0; 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 + or - 1 but could be increased for poor waves or removed entirely - uint16_t errCnt = 0, MaxBits = 512; + 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 + size_t MaxBits = 1024; lastBit = start - *clk; + for (i = start; i < *size; ++i) { - if ((BinStream[i] >= high) && ((i-lastBit) > (*clk-tol))){ - //high found and we are expecting a bar - lastBit += *clk; - BinStream[bitnum++] = *invert; - } else if ((BinStream[i] <= low) && ((i-lastBit) > (*clk-tol))){ - //low found and we are expecting a bar + if (i-lastBit >= *clk-tol){ + if (BinStream[i] >= high) { + BinStream[bitnum++] = *invert; + } else if (BinStream[i] <= low) { + BinStream[bitnum++] = *invert ^ 1; + } else if (i-lastBit >= *clk+tol) { + if (bitnum > 0) { + BinStream[bitnum++]=7; + errCnt++; + } + } else { //in tolerance - looking for peak + continue; + } + midBit = 0; lastBit += *clk; - BinStream[bitnum++] = *invert ^ 1; - } else if ((i-lastBit)>(*clk+tol)){ - //should have hit a high or low based on clock!! - //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) { - BinStream[bitnum++] = 77; - errCnt++; - } - lastBit += *clk;//skip over error + } else if (i-lastBit >= (*clk/2-tol) && !midBit && !askType){ + if (BinStream[i] >= high) { + BinStream[bitnum++] = *invert; + } else if (BinStream[i] <= low) { + BinStream[bitnum++] = *invert ^ 1; + } else if (i-lastBit >= *clk/2+tol) { + BinStream[bitnum] = BinStream[bitnum-1]; + bitnum++; + } else { //in tolerance - looking for peak + continue; + } + midBit = 1; } if (bitnum >= MaxBits) break; } @@ -219,33 +246,18 @@ int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert, int max return errCnt; } -//by marshmellow -//encode binary data into binary manchester -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; -} - //by marshmellow //take 10 and 01 and manchester decode //run through 2 times and take least errCnt -int manrawdecode(uint8_t * BitStream, size_t *size) +int manrawdecode(uint8_t * BitStream, size_t *size, uint8_t invert) { uint16_t bitnum=0, MaxBits = 512, errCnt = 0; size_t i, ii; uint16_t bestErr = 1000, bestRun = 0; - if (size == 0) return -1; + if (*size < 16) return -1; + //find correct start position [alignment] for (ii=0;ii<2;++ii){ - for (i=ii; i<*size-2; i+=2) + for (i=ii; i<*size-3; i+=2) if (BitStream[i]==BitStream[i+1]) errCnt++; @@ -255,13 +267,14 @@ int manrawdecode(uint8_t * BitStream, size_t *size) } errCnt=0; } - for (i=bestRun; i < *size-2; i+=2){ + //decode + for (i=bestRun; i < *size-3; i+=2){ if(BitStream[i] == 1 && (BitStream[i+1] == 0)){ - BitStream[bitnum++]=0; + BitStream[bitnum++]=invert; } else if((BitStream[i] == 0) && BitStream[i+1] == 1){ - BitStream[bitnum++]=1; + BitStream[bitnum++]=invert^1; } else { - BitStream[bitnum++]=77; + BitStream[bitnum++]=7; } if(bitnum>MaxBits) break; } @@ -269,6 +282,32 @@ int manrawdecode(uint8_t * BitStream, size_t *size) return bestErr; } +uint32_t manchesterEncode2Bytes(uint16_t datain) { + uint32_t output = 0; + uint8_t curBit = 0; + for (uint8_t i=0; i<16; i++) { + curBit = (datain >> (15-i) & 1); + output |= (1<<(((15-i)*2)+curBit)); + } + return output; +} + +//by marshmellow +//encode binary data into binary manchester +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; +} + //by marshmellow //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 @@ -291,7 +330,7 @@ int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert) for (i=offset; i<*size-3; i+=2){ //check for phase error if (BitStream[i+1]==BitStream[i+2]) { - BitStream[bitnum++]=77; + BitStream[bitnum++]=7; errCnt++; } if((BitStream[i]==1 && BitStream[i+1]==0) || (BitStream[i]==0 && BitStream[i+1]==1)){ @@ -299,7 +338,7 @@ int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert) } else if((BitStream[i]==0 && BitStream[i+1]==0) || (BitStream[i]==1 && BitStream[i+1]==1)){ BitStream[bitnum++]=invert; } else { - BitStream[bitnum++]=77; + BitStream[bitnum++]=7; errCnt++; } if(bitnum>MaxBits) break; @@ -308,89 +347,7 @@ int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert) return errCnt; } -//by marshmellow -void askAmp(uint8_t *BitStream, size_t size) -{ - int shift = 127; - int shiftedVal=0; - for(size_t 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 -int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert, int maxErr, uint8_t amp) -{ - if (*size==0) return -1; - int start = DetectASKClock(BinStream, *size, clk, maxErr); //clock default - if (*clk==0 || start < 0) return -1; - if (*invert != 1) *invert = 0; - if (amp==1) askAmp(BinStream, *size); - - uint8_t initLoopMax = 255; - if (initLoopMax > *size) initLoopMax = *size; - // Detect high and lows - //25% clip in case highs and lows aren't clipped [marshmellow] - int high, low; - if (getHiLo(BinStream, initLoopMax, &high, &low, 75, 75) < 1) - return -1; //just noise - - // if clean clipped waves detected run alternate demod - if (DetectCleanAskWave(BinStream, *size, high, low)) - return cleanAskRawDemod(BinStream, size, *clk, *invert, high, low); - - int lastBit; //set first clock check - can go negative - size_t i, errCnt = 0, bitnum = 0; //output counter - uint8_t midBit = 0; - size_t MaxBits = 1024; - lastBit = start - *clk; - - for (i = start; i < *size; ++i) { - if (i - lastBit > *clk){ - if (BinStream[i] >= high) { - BinStream[bitnum++] = *invert; - } else if (BinStream[i] <= low) { - BinStream[bitnum++] = *invert ^ 1; - } else { - if (bitnum > 0) { - BinStream[bitnum++]=77; - errCnt++; - } - } - midBit = 0; - lastBit += *clk; - } else if (i-lastBit > (*clk/2) && midBit == 0){ - if (BinStream[i] >= high) { - BinStream[bitnum++] = *invert; - } else if (BinStream[i] <= low) { - BinStream[bitnum++] = *invert ^ 1; - } else { - - BinStream[bitnum] = BinStream[bitnum-1]; - bitnum++; - } - midBit = 1; - } - if (bitnum >= MaxBits) break; - } - *size = bitnum; - return errCnt; -} - +// by marshmellow // demod gProxIIDemod // error returns as -x // success returns start position in BitStream @@ -422,7 +379,9 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow if (fclow==0) fclow=8; //set the threshold close to 0 (graph) or 128 std to avoid static uint8_t threshold_value = 123; - + size_t preLastSample = 0; + size_t LastSample = 0; + size_t currSample = 0; // sync to first lo-hi transition, and threshold // Need to threshold first sample @@ -442,13 +401,22 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow // Check for 0->1 transition if (dest[idx-1] < dest[idx]) { // 0 -> 1 transition - if ((idx-last_transition)<(fclow-2)){ //0-5 = garbage noise + preLastSample = LastSample; + LastSample = currSample; + currSample = idx-last_transition; + if (currSample < (fclow-2)){ //0-5 = garbage noise //do nothing with extra garbage - } else if ((idx-last_transition) < (fchigh-1)) { //6-8 = 8 waves + } else if (currSample < (fchigh-1)) { //6-8 = 8 sample waves + if (LastSample > (fchigh-2) && (preLastSample < (fchigh-1) || preLastSample == 0 )){ + dest[numBits-1]=1; //correct last 9 wave surrounded by 8 waves + } dest[numBits++]=1; - } else if ((idx-last_transition) > (fchigh+1) && !numBits) { //12 + and first bit = garbage + + } else if (currSample > (fchigh) && !numBits) { //12 + and first bit = garbage //do nothing with beginning garbage - } else { //9+ = 10 waves + } else if (currSample == (fclow+1) && LastSample == (fclow-1)) { // had a 7 then a 9 should be two 8's + dest[numBits++]=1; + } else { //9+ = 10 sample waves dest[numBits++]=0; } last_transition = idx; @@ -471,12 +439,16 @@ size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen, //if lastval was 1, we have a 1->0 crossing if (dest[idx-1]==1) { - if (!numBits && n < rfLen/fclow) { - n=0; - lastval = dest[idx]; - continue; + if (!numBits) { + if (n < rfLen/fclow) { + n=0; + lastval = dest[idx]; + continue; + } + n = (n * fclow + rfLen/4) / rfLen; + } else { + n = (n * fclow + rfLen/2) / rfLen; } - n = (n * fclow + rfLen/2) / rfLen; } else {// 0->1 crossing //test first bitsample too small if (!numBits && n < rfLen/fchigh) { @@ -579,7 +551,7 @@ int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, ui return (int)startIdx; } -uint32_t bytebits_to_byte(uint8_t* src, size_t numbits) +uint32_t bytebits_to_byte(uint8_t *src, size_t numbits) { uint32_t num = 0; for(int i = 0 ; i < numbits ; i++) @@ -590,6 +562,17 @@ uint32_t bytebits_to_byte(uint8_t* src, size_t numbits) return num; } +//least significant bit first +uint32_t bytebits_to_byteLSBF(uint8_t *src, size_t numbits) +{ + uint32_t num = 0; + for(int i = 0 ; i < numbits ; i++) + { + num = (num << 1) | *(src + (numbits-(i+1))); + } + return num; +} + int IOdemodFSK(uint8_t *dest, size_t size) { if (justNoise(dest, size)) return -1; @@ -618,11 +601,30 @@ int IOdemodFSK(uint8_t *dest, size_t size) return (int) startIdx; } return -5; +} + +// by marshmellow +// find viking preamble 0xF200 in already demoded data +int VikingDemod_AM(uint8_t *dest, size_t *size) { + //make sure buffer has data + if (*size < 64*2) return -2; + + size_t startIdx = 0; + uint8_t preamble[] = {1,1,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -4; //preamble not found + uint32_t checkCalc = bytebits_to_byte(dest+startIdx,8) ^ bytebits_to_byte(dest+startIdx+8,8) ^ bytebits_to_byte(dest+startIdx+16,8) + ^ bytebits_to_byte(dest+startIdx+24,8) ^ bytebits_to_byte(dest+startIdx+32,8) ^ bytebits_to_byte(dest+startIdx+40,8) + ^ bytebits_to_byte(dest+startIdx+48,8) ^ bytebits_to_byte(dest+startIdx+56,8); + if ( checkCalc != 0xA8 ) return -5; + if (*size != 64) return -6; + //return start position + return (int) startIdx; } // by marshmellow // takes a array of binary values, start position, length of bits per parity (includes parity bit), -// Parity Type (1 for odd 0 for even), and binary Length (length to run) +// Parity Type (1 for odd; 0 for even; 2 Always 1's), and binary Length (length to run) size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t pType, size_t bLen) { uint32_t parityWd = 0; @@ -632,9 +634,13 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p parityWd = (parityWd << 1) | BitStream[startIdx+word+bit]; BitStream[j++] = (BitStream[startIdx+word+bit]); } - j--; + j--; // overwrite parity with next data // if parity fails then return 0 - if (parityTest(parityWd, pLen, pType) == 0) return -1; + if (pType == 2) { // then marker bit which should be a 1 + if (!BitStream[j]) return 0; + } else { + if (parityTest(parityWd, pLen, pType) == 0) return 0; + } bitCnt+=(pLen-1); parityWd = 0; } @@ -643,6 +649,21 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p return bitCnt; } +// Ask/Biphase Demod then try to locate an ISO 11784/85 ID +// BitStream must contain previously askrawdemod and biphasedemoded data +int FDXBdemodBI(uint8_t *dest, size_t *size) +{ + //make sure buffer has enough data + if (*size < 128) return -1; + + size_t startIdx = 0; + uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,1}; + + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -2; //preamble not found + return (int)startIdx; +} + // by marshmellow // FSK Demod then try to locate an AWID ID int AWIDdemodFSK(uint8_t *dest, size_t *size) @@ -686,14 +707,26 @@ int PyramiddemodFSK(uint8_t *dest, size_t *size) return (int)startIdx; } +/* +void dummy(char *fmt, ...){} -uint8_t DetectCleanAskWave(uint8_t dest[], size_t size, int high, int low) +#ifndef ON_DEVICE +#include "ui.h" +#define prnt PrintAndLog +#else + +#define prnt dummy +#endif +*/ +// by marshmellow +// to detect a wave that has heavily clipped (clean) samples +uint8_t DetectCleanAskWave(uint8_t dest[], size_t size, uint8_t high, uint8_t low) { uint16_t allPeaks=1; uint16_t cntPeaks=0; - size_t loopEnd = 572; + size_t loopEnd = 512+160; if (loopEnd > size) loopEnd = size; - for (size_t i=60; ilow && dest[i]128) { - if (!high){ - high=1; - if (cnt > highCnt){ - if (highCnt != 0) highCnt2 = highCnt; - highCnt = cnt; - } else if (cnt > highCnt2) { - highCnt2 = cnt; - } - cnt=1; - } else { - cnt++; - } - } else if (dest[idx] <= 128){ - if (high) { - high=0; - if (cnt > highCnt) { - if (highCnt != 0) highCnt2 = highCnt; - highCnt = cnt; - } else if (cnt > highCnt2) { - highCnt2 = cnt; - } - cnt=1; - } else { - cnt++; - } - } + uint8_t fndClk[] = {8,16,32,40,50,64,128}; + size_t startwave; + size_t i = 100; + size_t minClk = 255; + // get to first full low to prime loop and skip incomplete first pulse + while ((dest[i] < high) && (i < size)) + ++i; + while ((dest[i] > low) && (i < size)) + ++i; + + // loop through all samples + while (i < size) { + // measure from low to low + while ((dest[i] > low) && (i < size)) + ++i; + startwave= i; + while ((dest[i] < high) && (i < size)) + ++i; + while ((dest[i] > low) && (i < size)) + ++i; + //get minimum measured distance + if (i-startwave < minClk && i < size) + minClk = i - startwave; } - uint8_t tol; - for (idx=8; idx>0; idx--){ - tol = clk[idx]/8; - if (clk[idx] >= highCnt - tol && clk[idx] <= highCnt + tol) - return clk[idx]; - if (clk[idx] >= highCnt2 - tol && clk[idx] <= highCnt2 + tol) - return clk[idx]; + // set clock + //prnt("minClk: %d",minClk); + for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) { + if (minClk >= fndClk[clkCnt]-(fndClk[clkCnt]/8) && minClk <= fndClk[clkCnt]+1) + return fndClk[clkCnt]; } - return -1; + return 0; } // by marshmellow @@ -763,15 +782,15 @@ int DetectStrongAskClock(uint8_t dest[], size_t size) int DetectASKClock(uint8_t dest[], size_t size, int *clock, int maxErr) { size_t i=1; - uint8_t clk[]={255,8,16,32,40,50,64,100,128,255}; + uint8_t clk[] = {255,8,16,32,40,50,64,100,128,255}; + uint8_t clkEnd = 9; uint8_t loopCnt = 255; //don't need to loop through entire array... - if (size==0) return -1; - if (size <= loopCnt) loopCnt = size-1; //not enough samples - + if (size <= loopCnt+60) return -1; //not enough samples + size -= 60; //sometimes there is a strange end wave - filter out this.... //if we already have a valid clock uint8_t clockFnd=0; - for (;i<9;++i) - if (clk[i] == *clock) clockFnd=i; + for (;i1; i--){ - if (clk[i] == ans) { - *clock = ans; - clockFnd = i; - break; //clock found but continue to find best startpos + if (!clockFnd){ + if (DetectCleanAskWave(dest, size, peak, low)==1){ + int ans = DetectStrongAskClock(dest, size, peak, low); + for (i=clkEnd-1; i>0; i--){ + if (clk[i] == ans) { + *clock = ans; + //clockFnd = i; + return 0; // for strong waves i don't use the 'best start position' yet... + //break; //clock found but continue to find best startpos [not yet] + } } } } @@ -795,21 +817,25 @@ int DetectASKClock(uint8_t dest[], size_t size, int *clock, int maxErr) uint8_t bestStart[]={0,0,0,0,0,0,0,0,0}; size_t errCnt = 0; size_t arrLoc, loopEnd; - //test each valid clock from smallest to greatest to see which lines up - uint8_t clkEnd=9; - if (clockFnd>0) clkEnd=clockFnd+1; - else clockFnd=1; - for(clkCnt=clockFnd; clkCnt < clkEnd; clkCnt++){ - if (clk[clkCnt] == 32){ + if (clockFnd>0) { + clkCnt = clockFnd; + clkEnd = clockFnd+1; + } + else clkCnt=1; + + //test each valid clock from smallest to greatest to see which lines up + for(; clkCnt < clkEnd; clkCnt++){ + if (clk[clkCnt] <= 32){ tol=1; }else{ tol=0; } - if (!maxErr && loopCnt>clk[clkCnt]*3) loopCnt=clk[clkCnt]*3; + //if no errors allowed - keep start within the first clock + if (!maxErr && size > clk[clkCnt]*2 + tol && clk[clkCnt]<128) loopCnt=clk[clkCnt]*2; bestErr[clkCnt]=1000; //try lining up the peaks by moving starting point (try first few clocks) - for (ii=0; ii < loopCnt-tol-clk[clkCnt]; ii++){ + for (ii=0; ii < loopCnt; ii++){ if (dest[ii] < peak && dest[ii] > low) continue; errCnt=0; @@ -824,11 +850,11 @@ int DetectASKClock(uint8_t dest[], size_t size, int *clock, int maxErr) errCnt++; } } - //if we found no errors then we can stop here + //if we found no errors then we can stop here and a low clock (common clocks) // 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) { - *clock = clk[clkCnt]; + //prnt("DEBUG: clk %d, err %d, ii %d, i %d",clk[clkCnt],errCnt,ii,i); + if(errCnt==0 && clkCnt<7) { + if (!clockFnd) *clock = clk[clkCnt]; return ii; } //if we found errors see if it is lowest so far and save it as best run @@ -838,9 +864,9 @@ int DetectASKClock(uint8_t dest[], size_t size, int *clock, int maxErr) } } } - uint8_t iii=0; + uint8_t iii; uint8_t best=0; - for (iii=0; iii<8; ++iii){ + for (iii=1; iii maxErr) return -1; - *clock = clk[best]; + //if (bestErr[best] > maxErr) return -1; + if (!clockFnd) *clock = clk[best]; return bestStart[best]; } @@ -862,7 +888,7 @@ 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); + //prnt("DEBUG: waveStart: %d",waveStart); } else { waveEnd = i+1; - //PrintAndLog("DEBUG: waveEnd: %d",waveEnd); + //prnt("DEBUG: waveEnd: %d",waveEnd); waveLenCnt = waveEnd-waveStart; if (waveLenCnt > fc){ firstFullWave = waveStart; @@ -897,7 +923,7 @@ int DetectPSKClock(uint8_t dest[], size_t size, int clock) } } } - //PrintAndLog("DEBUG: firstFullWave: %d, waveLen: %d",firstFullWave,fullWaveLen); + //prnt("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--){ @@ -905,7 +931,7 @@ int DetectPSKClock(uint8_t dest[], size_t size, int clock) waveStart = 0; errCnt=0; peakcnt=0; - //PrintAndLog("DEBUG: clk: %d, lastClkBit: %d",clk[clkCnt],lastClkBit); + //prnt("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 @@ -918,7 +944,7 @@ int DetectPSKClock(uint8_t dest[], size_t size, int clock) 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); + //prnt("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]; @@ -947,11 +973,50 @@ int DetectPSKClock(uint8_t dest[], size_t size, int clock) 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]); + //prnt("DEBUG: Clk: %d, peaks: %d, errs: %d, bestClk: %d",clk[iii],peaksdet[iii],bestErr[iii],clk[best]); } return clk[best]; } +int DetectStrongNRZClk(uint8_t *dest, size_t size, int peak, int low){ + //find shortest transition from high to low + size_t i = 0; + size_t transition1 = 0; + int lowestTransition = 255; + uint8_t lastWasHigh=0; + //find first valid beginning of a high/low wave + if (dest[i] >= peak) { + for (; i < size; i++) { + if (dest[i] <= low) break; + } + lastWasHigh=0; + } else if (dest[i] <= low) { + for (; i < size; i++) { + if (dest[i] >= peak) break; + } + lastWasHigh=1; + } else { + for (; i < size; i++) { + if (dest[i] >= peak || dest[i] <= low) { + lastWasHigh = (dest[i] >= peak); + break; + } + } + } + if (i==size) return 0; + transition1 = i; + + for (;i < size; i++) { + if ((dest[i] >= peak && !lastWasHigh) || (dest[i] <= low && lastWasHigh)) { + lastWasHigh = (dest[i] >= peak); + if (i-transition1 < lowestTransition) lowestTransition = i-transition1; + transition1 = i; + } + } + if (lowestTransition == 255) lowestTransition = 0; + return lowestTransition; +} + //by marshmellow //detect nrz clock by reading #peaks vs no peaks(or errors) int DetectNRZClock(uint8_t dest[], size_t size, int clock) @@ -960,8 +1025,7 @@ int DetectNRZClock(uint8_t dest[], size_t size, int clock) uint8_t clk[]={8,16,32,40,50,64,100,128,255}; size_t loopCnt = 4096; //don't need to loop through entire array... if (size == 0) return 0; - if (size= peak || dest[i] <= low){ - peakcnt++; + if (!firstpeak) continue; + smplCnt++; } else { - if (peakcnt>0 && maxPeak < peakcnt){ - maxPeak = peakcnt; + firstpeak=1; + if (smplCnt > 6 ){ + if (maxPeak > smplCnt){ + maxPeak = smplCnt; + //prnt("maxPk: %d",maxPeak); + } + peakcnt++; + //prnt("maxPk: %d, smplCnt: %d, peakcnt: %d",maxPeak,smplCnt,peakcnt); + smplCnt=0; } - peakcnt=0; } } + uint8_t samePeak=0; + uint8_t errBitHigh=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++; + uint8_t bitHigh =0; + uint8_t ignoreCnt = 0; + uint8_t ignoreWindow = 4; + int lastBit = ii-clk[clkCnt]; + //loop through to see if this start location works + for (i = ii; i < size-20; ++i) { + // if we are at a clock bit + if ((i >= lastBit + clk[clkCnt] - tol) && (i <= lastBit + clk[clkCnt] + tol)) { + //test high/low + if (dest[i] >= peak || dest[i] <= low) { + if (samePeak) peakcnt--; + bitHigh=1; + peakcnt++; + errBitHigh = 0; + ignoreCnt = ignoreWindow; + lastBit += clk[clkCnt]; + samePeak = 1; + } else if (i == lastBit + clk[clkCnt] + tol) { + lastBit += clk[clkCnt]; + samePeak = 0; + } + //else if not a clock bit and no peaks + } else if (dest[i] < peak && dest[i] > low){ + samePeak = 0; + if (ignoreCnt==0){ + bitHigh=0; + if (errBitHigh==1) peakcnt--; + errBitHigh=0; + } else { + ignoreCnt--; + } + // else if not a clock bit but we have a peak + } else if ((dest[i]>=peak || dest[i]<=low) && (bitHigh==0)) { + //error bar found no clock... + errBitHigh=1; } } if(peakcnt>peaksdet[clkCnt]) { @@ -1015,9 +1121,14 @@ int DetectNRZClock(uint8_t dest[], size_t size, int clock) for (iii=7; iii > 0; iii--){ if (peaksdet[iii] > peaksdet[best]){ best = iii; + } else if (peaksdet[iii] == peaksdet[best] && lowestTransition){ + if (clk[iii] > (lowestTransition - (clk[iii]/8)) && clk[iii] < (lowestTransition + (clk[iii]/8))){ + best = iii; + } } - //PrintAndLog("DEBUG: Clk: %d, peaks: %d, errs: %d, bestClk: %d",clk[iii],peaksdet[iii],bestErr[iii],clk[best]); + //prnt("DEBUG: Clk: %d, peaks: %d, maxPeak: %d, bestClk: %d, lowestTrs: %d",clk[iii],peaksdet[iii],maxPeak, clk[best], lowestTransition); } + return clk[best]; } @@ -1029,7 +1140,7 @@ void psk1TOpsk2(uint8_t *BitStream, size_t size) size_t i=1; uint8_t lastBit=BitStream[0]; for (; i*size) gLen = *size; + if (gLen>*size) gLen = *size-20; int high, low; if (getHiLo(dest, gLen, &high, &low, 75, 75) < 1) return -3; //25% fuzz on high 25% fuzz on low - int lastBit = 0; //set first clock check - size_t iii = 0, bitnum = 0; //bitnum counter - uint16_t errCnt = 0, MaxBits = 1000; - size_t bestErrCnt = maxErr+1; - size_t bestPeakCnt = 0, bestPeakStart = 0; - uint8_t bestFirstPeakHigh=0, firstPeakHigh=0, curBit=0, bitHigh=0, errBitHigh=0; - 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 - uint16_t peakCnt=0; - uint8_t ignoreWindow=4; - uint8_t ignoreCnt=ignoreWindow; //in case of noise 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)){ - if (dest[iii]>=high) firstPeakHigh=1; - else firstPeakHigh=0; - lastBit=iii-*clk; - peakCnt=0; - errCnt=0; - //loop through to see if this start location works - for (i = iii; i < *size; ++i) { - // if we are at a clock bit - if ((i >= lastBit + *clk - tol) && (i <= lastBit + *clk + tol)) { - //test high/low - if (dest[i] >= high || dest[i] <= low) { - bitHigh = 1; - peakCnt++; - errBitHigh = 0; - ignoreCnt = ignoreWindow; - lastBit += *clk; - } else if (i == lastBit + *clk + tol) { - lastBit += *clk; - } - //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--; - } - } else if ((dest[i]>=high || dest[i]<=low) && (bitHigh==0)) { - //error bar found no clock... - errBitHigh=1; - } - if (((i-iii) / *clk)>=MaxBits) break; - } - //we got more than 64 good bits and not all errors - if (((i-iii) / *clk) > 64 && (errCnt <= (maxErr))) { - //possible good read - if (!errCnt || peakCnt > bestPeakCnt){ - bestFirstPeakHigh=firstPeakHigh; - bestErrCnt = errCnt; - bestPeakCnt = peakCnt; - bestPeakStart = iii; - if (!errCnt) break; //great read - finish - } - } - } + + uint8_t bit=0; + //convert wave samples to 1's and 0's + for(i=20; i < *size-20; i++){ + if (dest[i] >= high) bit = 1; + if (dest[i] <= low) bit = 0; + dest[i] = bit; } - //PrintAndLog("DEBUG: bestErrCnt: %d, maxErr: %d, bestStart: %d, bestPeakCnt: %d, bestPeakStart: %d",bestErrCnt,maxErr,bestStart,bestPeakCnt,bestPeakStart); - if (bestErrCnt > maxErr) return bestErrCnt; - - //best run is good enough set to best run and set overwrite BinStream - lastBit = bestPeakStart - *clk; - memset(dest, bestFirstPeakHigh^1, bestPeakStart / *clk); - bitnum += (bestPeakStart / *clk); - for (i = bestPeakStart; i < *size; ++i) { - // if expecting a clock bit - if ((i >= lastBit + *clk - tol) && (i <= lastBit + *clk + tol)) { - // test high/low - if (dest[i] >= high || dest[i] <= low) { - peakCnt++; - bitHigh = 1; - errBitHigh = 0; - ignoreCnt = ignoreWindow; - curBit = *invert; - if (dest[i] >= high) curBit ^= 1; - dest[bitnum++] = curBit; - lastBit += *clk; - //else no bars found in clock area - } else if (i == lastBit + *clk + tol) { - dest[bitnum++] = curBit; - lastBit += *clk; - } - //else if no bars found - } else if (dest[i] < high && dest[i] > low){ - if (ignoreCnt == 0){ - bitHigh = 0; - if (errBitHigh == 1){ - dest[bitnum++] = 77; - errCnt++; - } - errBitHigh=0; - } else { - ignoreCnt--; - } - } else if ((dest[i] >= high || dest[i] <= low) && (bitHigh == 0)) { - //error bar found no clock... - errBitHigh=1; + //now demod based on clock (rf/32 = 32 1's for one 1 bit, 32 0's for one 0 bit) + size_t lastBit = 0; + size_t numBits = 0; + for(i=21; i < *size-20; i++) { + //if transition detected or large number of same bits - store the passed bits + if (dest[i] != dest[i-1] || (i-lastBit) == (10 * *clk)) { + memset(dest+numBits, dest[i-1] ^ *invert, (i - lastBit + (*clk/4)) / *clk); + numBits += (i - lastBit + (*clk/4)) / *clk; + lastBit = i-1; } - if (bitnum >= MaxBits) break; } - *size = bitnum; - return bestErrCnt; + *size = numBits; + return 0; } //by marshmellow @@ -1436,6 +1418,7 @@ 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 fc && waveStart > fc){ //not first peak and is a large wave + if (waveLenCnt > fc && waveStart > fc && !(waveLenCnt > fc+2)){ //not first peak and is a large wave but not out of whack lastAvgWaveVal = avgWaveVal/(waveLenCnt); firstFullWave = waveStart; fullWaveLen=waveLenCnt; @@ -1465,14 +1448,21 @@ int pskRawDemod(uint8_t dest[], size_t *size, int *clock, int *invert) } avgWaveVal += dest[i+2]; } + if (firstFullWave == 0) { + // no phase shift detected - could be all 1's or 0's - doesn't matter where we start + // so skip a little to ensure we are past any Start Signal + firstFullWave = 160; + memset(dest, curPhase, firstFullWave / *clock); + } else { + memset(dest, curPhase^1, firstFullWave / *clock); + } + //advance bits + numBits += (firstFullWave / *clock); + //set start of wave as clock align + lastClkBit = firstFullWave; //PrintAndLog("DEBUG: firstFullWave: %d, waveLen: %d",firstFullWave,fullWaveLen); - lastClkBit = firstFullWave; //set start of wave as clock align //PrintAndLog("DEBUG: clk: %d, lastClkBit: %d", *clock, lastClkBit); waveStart = 0; - size_t numBits=0; - //set skipped bits - memset(dest, curPhase^1, firstFullWave / *clock); - numBits += (firstFullWave / *clock); dest[numBits++] = curPhase; //set first read bit for (i = firstFullWave + fullWaveLen - 1; i < *size-3; i++){ //top edge of wave = start of new wave @@ -1497,7 +1487,7 @@ int pskRawDemod(uint8_t dest[], size_t *size, int *clock, int *invert) //noise after a phase shift - ignore } else { //phase shift before supposed to based on clock errCnt++; - dest[numBits++] = 77; + dest[numBits++] = 7; } } else if (i+1 > lastClkBit + *clock + tol + fc){ lastClkBit += *clock; //no phase shift but clock bit