X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/93507a33756a2aca70161e18502252f53b578f85..6fe5c94bda4d272dc739b71ed5e54a8678f6065a:/common/lfdemod.c diff --git a/common/lfdemod.c b/common/lfdemod.c index 063c8a74..7297c4e6 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -11,6 +11,20 @@ #include #include #include "lfdemod.h" +#include "common.h" + +/* //un_comment to allow debug print calls when used not on device +void dummy(char *fmt, ...){} + +#ifndef ON_DEVICE +#include "ui.h" +#define prnt PrintAndLog +#else + +#define prnt dummy +#endif +*/ + uint8_t justNoise(uint8_t *BitStream, size_t size) { static const uint8_t THRESHOLD = 123; @@ -385,15 +399,15 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow // sync to first lo-hi transition, and threshold // Need to threshold first sample - - if(dest[0] < threshold_value) dest[0] = 0; + // skip 160 samples to allow antenna/samples to settle + if(dest[160] < threshold_value) dest[0] = 0; else dest[0] = 1; size_t numBits = 0; // count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8) // or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere // between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10 - for(idx = 1; idx < size; idx++) { + for(idx = 161; idx < size-20; idx++) { // threshold current value if (dest[idx] < threshold_value) dest[idx] = 0; @@ -404,11 +418,11 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow preLastSample = LastSample; LastSample = currSample; currSample = idx-last_transition; - if (currSample < (fclow-2)){ //0-5 = garbage noise + if (currSample < (fclow-2)){ //0-5 = garbage noise (or 0-3) //do nothing with extra garbage - } else if (currSample < (fchigh-1)) { //6-8 = 8 sample waves + } else if (currSample < (fchigh-1)) { //6-8 = 8 sample waves or 3-6 = 5 if (LastSample > (fchigh-2) && (preLastSample < (fchigh-1) || preLastSample == 0 )){ - dest[numBits-1]=1; //correct last 9 wave surrounded by 8 waves + dest[numBits-1]=1; //correct previous 9 wave surrounded by 8 waves } dest[numBits++]=1; @@ -439,23 +453,8 @@ 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) { - 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) { - n=0; - lastval = dest[idx]; - continue; - } n = (n * fchigh + rfLen/2) / rfLen; } if (n == 0) n = 1; @@ -477,6 +476,7 @@ size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen, } return numBits; } + //by marshmellow (from holiman's base) // full fsk demod from GraphBuffer wave to decoded 1s and 0s (no mandemod) int fskdemod(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t invert, uint8_t fchigh, uint8_t fclow) @@ -686,7 +686,7 @@ int AWIDdemodFSK(uint8_t *dest, size_t *size) } // by marshmellow -// FSK Demod then try to locate an Farpointe Data (pyramid) ID +// FSK Demod then try to locate a Farpointe Data (pyramid) ID int PyramiddemodFSK(uint8_t *dest, size_t *size) { //make sure buffer has data @@ -707,35 +707,24 @@ int PyramiddemodFSK(uint8_t *dest, size_t *size) return (int)startIdx; } -/* -void dummy(char *fmt, ...){} - -#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; + bool allArePeaks = true; uint16_t cntPeaks=0; size_t loopEnd = 512+160; if (loopEnd > size) loopEnd = size; for (size_t i=160; ilow && dest[i] 300) return 1; + if (!allArePeaks){ + if (cntPeaks > 300) return true; } - return allPeaks; + return allArePeaks; } // by marshmellow // to help detect clocks on heavily clipped samples @@ -983,26 +972,15 @@ int DetectStrongNRZClk(uint8_t *dest, size_t size, int peak, int 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; - } - } - } + bool lastWasHigh = false; + + //find first valid beginning of a high or low wave + while ((dest[i] >= peak || dest[i] <= low) && (i < size)) + ++i; + while ((dest[i] < peak && dest[i] > low) && (i < size)) + ++i; + lastWasHigh = (dest[i] >= peak); + if (i==size) return 0; transition1 = i; @@ -1013,6 +991,7 @@ int DetectStrongNRZClk(uint8_t *dest, size_t size, int peak, int low){ transition1 = i; } } + //prnt("DEBUG: LowestTrs: %d",lowestTransition); if (lowestTransition == 255) lowestTransition = 0; return lowestTransition; } @@ -1035,7 +1014,6 @@ int DetectNRZClock(uint8_t dest[], size_t size, int clock) if (getHiLo(dest, loopCnt, &peak, &low, 75, 75) < 1) return 0; int lowestTransition = DetectStrongNRZClk(dest, size-20, peak, low); - //prnt("DEBUG: peak: %d, low: %d",peak,low); size_t ii; uint8_t clkCnt; uint8_t tol = 0; @@ -1043,14 +1021,14 @@ int DetectNRZClock(uint8_t dest[], size_t size, int clock) int16_t peakcnt = 0; int16_t peaksdet[] = {0,0,0,0,0,0,0,0}; uint16_t maxPeak = 255; - uint8_t firstpeak = 0; + bool firstpeak = false; //test for large clipped waves for (i=0; i= peak || dest[i] <= low){ if (!firstpeak) continue; smplCnt++; } else { - firstpeak=1; + firstpeak=true; if (smplCnt > 6 ){ if (maxPeak > smplCnt){ maxPeak = smplCnt; @@ -1062,8 +1040,12 @@ int DetectNRZClock(uint8_t dest[], size_t size, int clock) } } } - uint8_t samePeak=0; - uint8_t errBitHigh=0; + bool errBitHigh = 0; + bool bitHigh = 0; + uint8_t ignoreCnt = 0; + uint8_t ignoreWindow = 4; + bool lastPeakHigh = 0; + int lastBit = 0; peakcnt=0; //test each valid clock from smallest to greatest to see which lines up for(clkCnt=0; clkCnt < 8; ++clkCnt){ @@ -1072,42 +1054,41 @@ int DetectNRZClock(uint8_t dest[], size_t size, int clock) //try lining up the peaks by moving starting point (try first 256) for (ii=20; ii < loopCnt; ++ii){ if ((dest[ii] >= peak) || (dest[ii] <= low)){ - peakcnt=0; - uint8_t bitHigh =0; - uint8_t ignoreCnt = 0; - uint8_t ignoreWindow = 4; - int lastBit = ii-clk[clkCnt]; + peakcnt = 0; + bitHigh = false; + ignoreCnt = 0; + 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 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; + //if same peak don't count it + if ((dest[i] >= peak && !lastPeakHigh) || (dest[i] <= low && lastPeakHigh)) { + peakcnt++; + } + lastPeakHigh = (dest[i] >= peak); + bitHigh = true; + errBitHigh = false; 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; + bitHigh=false; + if (errBitHigh==true) peakcnt--; + errBitHigh=false; } else { ignoreCnt--; } // else if not a clock bit but we have a peak - } else if ((dest[i]>=peak || dest[i]<=low) && (bitHigh==0)) { + } else if ((dest[i]>=peak || dest[i]<=low) && (!bitHigh)) { //error bar found no clock... - errBitHigh=1; + errBitHigh=true; } } if(peakcnt>peaksdet[clkCnt]) { @@ -1119,12 +1100,12 @@ int DetectNRZClock(uint8_t dest[], size_t size, int clock) int iii=7; uint8_t best=0; 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))){ + if ((peaksdet[iii] >= (peaksdet[best]-1)) && (peaksdet[iii] <= peaksdet[best]+1) && lowestTransition) { + if (clk[iii] > (lowestTransition - (clk[iii]/8)) && clk[iii] < (lowestTransition + (clk[iii]/8))) { best = iii; } + } else if (peaksdet[iii] > peaksdet[best]){ + best = iii; } //prnt("DEBUG: Clk: %d, peaks: %d, maxPeak: %d, bestClk: %d, lowestTrs: %d",clk[iii],peaksdet[iii],maxPeak, clk[best], lowestTransition); } @@ -1236,18 +1217,18 @@ uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fc size_t i; if (size == 0) return 0; - uint8_t fcTol = (uint8_t)(0.5+(float)(fcHigh-fcLow)/2); + uint8_t fcTol = ((fcHigh*100 - fcLow*100)/2 + 50)/100; //(uint8_t)(0.5+(float)(fcHigh-fcLow)/2); rfLensFnd=0; fcCounter=0; rfCounter=0; firstBitFnd=0; //PrintAndLog("DEBUG: fcTol: %d",fcTol); - // prime i to first up transition - for (i = 1; i < size-1; i++) + // prime i to first peak / up transition + for (i = 160; i < size-20; i++) if (BitStream[i] > BitStream[i-1] && BitStream[i]>=BitStream[i+1]) break; - for (; i < size-1; i++){ + for (; i < size-20; i++){ fcCounter++; rfCounter++; @@ -1265,7 +1246,7 @@ uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fc //not the same size as the last wave - start of new bit sequence if (firstBitFnd > 1){ //skip first wave change - probably not a complete bit for (int ii=0; ii<15; ii++){ - if (rfLens[ii] == rfCounter){ + if (rfLens[ii] >= (rfCounter-4) && rfLens[ii] <= (rfCounter+4)){ rfCnts[ii]++; rfCounter = 0; break; @@ -1287,7 +1268,7 @@ uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fc uint8_t rfHighest=15, rfHighest2=15, rfHighest3=15; for (i=0; i<15; i++){ - //PrintAndLog("DEBUG: RF %d, cnts %d",rfLens[i], rfCnts[i]); + //prnt("DEBUG: RF %d, cnts %d",rfLens[i], rfCnts[i]); //get highest 2 RF values (might need to get more values to compare or compare all?) if (rfCnts[i]>rfCnts[rfHighest]){ rfHighest3=rfHighest2; @@ -1304,12 +1285,13 @@ uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fc // we could have mistakenly made a 9 a 10 instead of an 8 or visa versa so rfLens could be 1 FC off uint8_t tol1 = fcHigh+1; - //PrintAndLog("DEBUG: hightest: 1 %d, 2 %d, 3 %d",rfLens[rfHighest],rfLens[rfHighest2],rfLens[rfHighest3]); + //prnt("DEBUG: hightest: 1 %d, 2 %d, 3 %d",rfLens[rfHighest],rfLens[rfHighest2],rfLens[rfHighest3]); // loop to find the highest clock that has a remainder less than the tolerance // compare samples counted divided by + // test 128 down to 32 (shouldn't be possible to have fc/10 & fc/8 and rf/16 or less) int ii=7; - for (; ii>=0; ii--){ + for (; ii>=2; ii--){ if (rfLens[rfHighest] % clk[ii] < tol1 || rfLens[rfHighest] % clk[ii] > clk[ii]-tol1){ if (rfLens[rfHighest2] % clk[ii] < tol1 || rfLens[rfHighest2] % clk[ii] > clk[ii]-tol1){ if (rfLens[rfHighest3] % clk[ii] < tol1 || rfLens[rfHighest3] % clk[ii] > clk[ii]-tol1){ @@ -1330,8 +1312,8 @@ uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fc //mainly used for FSK field clock detection uint16_t countFC(uint8_t *BitStream, size_t size, uint8_t fskAdj) { - 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 fcLens[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; + uint16_t fcCnts[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; uint8_t fcLensFnd = 0; uint8_t lastFCcnt=0; uint8_t fcCounter = 0; @@ -1339,11 +1321,11 @@ uint16_t countFC(uint8_t *BitStream, size_t size, uint8_t fskAdj) if (size == 0) return 0; // prime i to first up transition - for (i = 1; i < size-1; i++) + for (i = 160; i < size-20; i++) if (BitStream[i] > BitStream[i-1] && BitStream[i] >= BitStream[i+1]) break; - for (; i < size-1; i++){ + for (; i < size-20; i++){ if (BitStream[i] > BitStream[i-1] && BitStream[i] >= BitStream[i+1]){ // new up transition fcCounter++; @@ -1356,14 +1338,14 @@ uint16_t countFC(uint8_t *BitStream, size_t size, uint8_t fskAdj) lastFCcnt = fcCounter; } // find which fcLens to save it to: - for (int ii=0; ii<10; ii++){ + for (int ii=0; ii<15; ii++){ if (fcLens[ii]==fcCounter){ fcCnts[ii]++; fcCounter=0; break; } } - if (fcCounter>0 && fcLensFnd<10){ + if (fcCounter>0 && fcLensFnd<15){ //add new fc length fcCnts[fcLensFnd]++; fcLens[fcLensFnd++]=fcCounter; @@ -1375,11 +1357,11 @@ uint16_t countFC(uint8_t *BitStream, size_t size, uint8_t fskAdj) } } - uint8_t best1=9, best2=9, best3=9; + uint8_t best1=14, best2=14, best3=14; uint16_t maxCnt1=0; // go through fclens and find which ones are bigest 2 - for (i=0; i<10; i++){ - // PrintAndLog("DEBUG: FC %d, Cnt %d, Errs %d",fcLens[i],fcCnts[i],errCnt); + for (i=0; i<15; i++){ + //prnt("DEBUG: FC %d, Cnt %d",fcLens[i],fcCnts[i]); // get the 3 best FC values if (fcCnts[i]>maxCnt1) { best3=best2; @@ -1393,6 +1375,7 @@ uint16_t countFC(uint8_t *BitStream, size_t size, uint8_t fskAdj) best3=i; } } + if (fcLens[best1]==0) return 0; uint8_t fcH=0, fcL=0; if (fcLens[best1]>fcLens[best2]){ fcH=fcLens[best1]; @@ -1401,11 +1384,13 @@ uint16_t countFC(uint8_t *BitStream, size_t size, uint8_t fskAdj) fcH=fcLens[best2]; fcL=fcLens[best1]; } + //prnt("DEBUG: dd %d > %d",(size-180)/fcH/3,fcCnts[best1]+fcCnts[best2]); + if ((size-180)/fcH/3 > fcCnts[best1]+fcCnts[best2]) return 0; //lots of waves not psk or fsk // TODO: take top 3 answers and compare to known Field clocks to get top 2 uint16_t fcs = (((uint16_t)fcH)<<8) | fcL; - // PrintAndLog("DEBUG: Best %d best2 %d best3 %d",fcLens[best1],fcLens[best2],fcLens[best3]); + //prnt("DEBUG: Best %d best2 %d best3 %d",fcLens[best1],fcLens[best2],fcLens[best3]); if (fskAdj) return fcs; return fcLens[best1]; }