X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/c6e5c7ea46eae6180eee3eb592a291257a0400b1..37a71c7a96bdcb787aa7c04871f42ef75e1ab164:/common/lfdemod.c diff --git a/common/lfdemod.c b/common/lfdemod.c index 61d01c27..797bce40 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -11,23 +11,29 @@ //un_comment to allow debug print calls when used not on device void dummy(char *fmt, ...){} - +void dummy_sgc (int clock, int startidx) {} #ifndef ON_DEVICE -# include "ui.h" +# include "ui.h" // plotclock, plotclockstartindex # include "cmdparser.h" # include "cmddata.h" # define prnt PrintAndLog +# define sgc SetGraphClock +void SetGraphClock(int clock, int startidx){ + PlotClock = clock; + PlockClockStartIndex = startidx; +} #else - uint8_t g_debugMode=0; + uint8_t g_debugMode = 0; # define prnt dummy +# define sgc dummy_sgc #endif //test samples are not just noise uint8_t justNoise(uint8_t *bits, size_t size) { #define THRESHOLD 123 uint8_t val = 1; - for(size_t idx=0; idx < size && val ;idx++) + for(size_t idx = 0; idx < size && val; idx++) val = bits[idx] < THRESHOLD; return val; } @@ -318,12 +324,13 @@ int askdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert, int maxErr { 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 (amp==1) askAmp(BinStream, *size); if (g_debugMode==2) prnt("DEBUG ASK: clk %d, beststart %d, amp %d", *clk, start, amp); + sgc(*clk, start); + uint8_t initLoopMax = 255; if (initLoopMax > *size) initLoopMax = *size; // Detect high and lows @@ -906,13 +913,14 @@ uint8_t DetectCleanAskWave(uint8_t dest[], size_t size, uint8_t high, uint8_t lo // by marshmellow // to help detect clocks on heavily clipped samples // based on count of low to low -int DetectStrongAskClock(uint8_t dest[], size_t size, uint8_t high, uint8_t low) +int DetectStrongAskClock(uint8_t dest[], size_t size, uint8_t high, uint8_t low, int *clock) { - uint8_t fndClk[] = {8,16,32,40,50,64,128}; + uint8_t clocks[] = {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 + int shortestWaveIdx = 0; + // 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)) @@ -929,21 +937,21 @@ int DetectStrongAskClock(uint8_t dest[], size_t size, uint8_t high, uint8_t low) while ((dest[i] > low) && (i < size)) ++i; //get minimum measured distance - if (i-startwave < minClk && i < size) + if (i-startwave < minClk && i < size) { minClk = i - startwave; + shortestWaveIdx = startwave; + } } // set clock if (g_debugMode==2) prnt("DEBUG ASK: detectstrongASKclk smallest wave: %d",minClk); for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) { - if (minClk >= fndClk[clkCnt]-(fndClk[clkCnt]/8) && minClk <= fndClk[clkCnt]+1) - return fndClk[clkCnt]; + if (minClk >= clocks[clkCnt]-(clocks[clkCnt]/8) && minClk <= clocks[clkCnt]+1) { + *clock = clocks[clkCnt]; + return shortestWaveIdx; + } } return 0; } -void SetGraphClock( int clock, int startidx){ - PlotClock = clock; - PlockClockStartIndex = startidx; -} // by marshmellow // not perfect especially with lower clocks or VERY good antennas (heavy wave clipping) @@ -970,15 +978,10 @@ int DetectASKClock(uint8_t dest[], size_t size, int *clock, int maxErr) //test for large clean peaks if (!clockFnd){ if (DetectCleanAskWave(dest, size, peak, low)==1){ - int ans = DetectStrongAskClock(dest, size, peak, low); - if (g_debugMode==2) prnt("DEBUG ASK: detectaskclk Clean Ask Wave Detected: clk %d",ans); - 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] - } + int ans = DetectStrongAskClock(dest, size, peak, low, clock); + if (g_debugMode==2) prnt("DEBUG ASK: detectaskclk Clean Ask Wave Detected: clk %i, ShortestWave: %i", clock ,ans); + if (ans > 0){ + return ans; // return shortest wave start pos } } } @@ -1030,8 +1033,6 @@ int DetectASKClock(uint8_t dest[], size_t size, int *clock, int maxErr) if (g_debugMode == 2) prnt("DEBUG ASK: clk %d, err %d, startpos %d, endpos %d", clk[clkCnt], errCnt, ii, i); if (errCnt==0 && clkCnt<7) { if (!clockFnd) *clock = clk[clkCnt]; - - SetGraphClock(*clock, ii); return ii; } //if we found errors see if it is lowest so far and save it as best run @@ -1055,15 +1056,18 @@ int DetectASKClock(uint8_t dest[], size_t size, int *clock, int maxErr) } if (!clockFnd) *clock = clk[best]; - SetGraphClock(*clock, bestStart[best]); return bestStart[best]; } +int DetectPSKClock(uint8_t dest[], size_t size, int clock) { + int firstPhaseShift = 0; + return DetectPSKClock_ext(dest, size, clock, &firstPhaseShift); +} + //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) -{ +int DetectPSKClock_ext(uint8_t dest[], size_t size, int clock, int *firstPhaseShift) { 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... @@ -1071,11 +1075,10 @@ int DetectPSKClock(uint8_t dest[], size_t size, int clock) size_t i=1; for (; i < 8; ++i) if (clk[i] == clock) return clock; - + if (size < 160+20) return 0; - // size must be larger than 20 here, and 160 later on. - if (size < loopCnt) loopCnt = size-20; + if (size < loopCnt) loopCnt = size-20; size_t waveStart=0, waveEnd=0, firstFullWave=0, lastClkBit=0; uint8_t clkCnt, fc=0, fullWaveLen=0, tol=1; @@ -1105,6 +1108,7 @@ int DetectPSKClock(uint8_t dest[], size_t size, int clock) } } } + *firstPhaseShift = firstFullWave; if (g_debugMode == 2) prnt("DEBUG PSK: firstFullWave: %d, waveLen: %d",firstFullWave,fullWaveLen); //test each valid clock from greatest to smallest to see which lines up @@ -1187,11 +1191,14 @@ int DetectStrongNRZClk(uint8_t *dest, size_t size, int peak, int low){ return lowestTransition; } +int DetectNRZClock(uint8_t dest[], size_t size, int clock) { + int bestStart = 0; + return DetectNRZClock_ext(dest, size, clock, &bestStart); +} + //by marshmellow //detect nrz clock by reading #peaks vs no peaks(or errors) -//iceman: shouldn't param clock be reference? like DetectASKClock -int DetectNRZClock(uint8_t dest[], size_t size, int clock) -{ +int DetectNRZClock_ext(uint8_t dest[], size_t size, int clock, int *clockStartIdx) { size_t i = 0; uint8_t clk[] = {8,16,32,40,50,64,100,128,255}; size_t loopCnt = 4096; //don't need to loop through entire array... @@ -1241,6 +1248,7 @@ int DetectNRZClock(uint8_t dest[], size_t size, int clock) uint8_t ignoreWindow = 4; bool lastPeakHigh = 0; int lastBit = 0; + int bestStart[] = {0,0,0,0,0,0,0,0,0}; peakcnt = 0; //test each valid clock from smallest to greatest to see which lines up for(clkCnt=0; clkCnt < 8; ++clkCnt){ @@ -1288,6 +1296,7 @@ int DetectNRZClock(uint8_t dest[], size_t size, int clock) } } if (peakcnt > peaksdet[clkCnt]) { + bestStart[clkCnt]=ii; peaksdet[clkCnt] = peakcnt; } } @@ -1305,7 +1314,7 @@ int DetectNRZClock(uint8_t dest[], size_t size, int clock) } if (g_debugMode==2) prnt("DEBUG NRZ: Clk: %d, peaks: %d, maxPeak: %d, bestClk: %d, lowestTrs: %d", clk[m], peaksdet[m], maxPeak, clk[best], lowestTransition); } - + *clockStartIdx = bestStart[best]; return clk[best]; } @@ -1394,10 +1403,14 @@ int nrzRawDemod(uint8_t *dest, size_t *size, int *clk, int *invert){ return 0; } +uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fcLow) { + int firstClockEdge = 0; + return detectFSKClk_ext(BitStream, size, fcHigh, fcLow, &firstClockEdge); +} + //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) -{ +uint8_t detectFSKClk_ext(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fcLow, int *firstClockEdge) { uint8_t clk[] = {8,16,32,40,50,64,100,128,0}; uint16_t rfLens[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; uint8_t rfCnts[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; @@ -1453,6 +1466,7 @@ uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fc rfLens[rfLensFnd++] = rfCounter; } } else { + *firstClockEdge = i; firstBitFnd++; } rfCounter=0;