X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/ba1a299ce67e4699e77fefe6a8ef825e30118961..4e3d8d0f764823d3550970d6d686a86e8f04d8af:/common/lfdemod.c diff --git a/common/lfdemod.c b/common/lfdemod.c index 11ba131b..25e52552 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -20,7 +20,7 @@ uint64_t Em410xDecode(uint8_t *BitStream, size_t size) // otherwise could be a void with no arguments //set defaults int high=0, low=128; - uint64_t lo=0; //hi=0, + uint64_t lo=0; uint32_t i = 0; uint32_t initLoopMax = 65; @@ -48,7 +48,7 @@ uint64_t Em410xDecode(uint8_t *BitStream, size_t size) // search for a start of frame marker if ( memcmp(BitStream+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) { // frame marker found - idx+=9;//sizeof(frame_marker_mask); + idx+=9; for (i=0; i<10;i++){ for(ii=0; ii<5; ++ii){ parityTest += BitStream[(i*5)+ii+idx]; @@ -56,7 +56,6 @@ uint64_t Em410xDecode(uint8_t *BitStream, size_t size) if (parityTest== ((parityTest>>1)<<1)){ parityTest=0; for (ii=0; ii<4;++ii){ - //hi = (hi<<1)|(lo>>31); 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); @@ -106,8 +105,8 @@ int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) return -2; } //25% fuzz in case highs and lows aren't clipped [marshmellow] - high=(int)((high-128)*.75)+128; - low= (int)((low-128)*.75)+128; + high=(int)(((high-128)*.75)+128); + low= (int)(((low-128)*.75)+128); //PrintAndLog("DEBUG - valid high: %d - valid low: %d",high,low); int lastBit = 0; //set first clock check @@ -292,7 +291,7 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) if (*clk<32) *clk=32; if (*invert != 0 && *invert != 1) *invert =0; uint32_t initLoopMax = 200; - if (initLoopMax>*size) initLoopMax=*size; + if (initLoopMax > *size) initLoopMax=*size; // Detect high and lows for (i = 0; i < initLoopMax; ++i) //200 samples should be plenty to find high and low values { @@ -306,14 +305,16 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) return -2; } //25% fuzz in case highs and lows aren't clipped [marshmellow] - high=(int)((high-128)*.75)+128; - low= (int)((low-128)*.75)+128; + high=(int)(((high-128)*.75)+128); + low= (int)(((low-128)*.75)+128); //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 + or - 1 but could be increased for poor waves or removed entirely + 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 uint32_t iii = 0; uint32_t gLen = *size; if (gLen > 500) gLen=500; @@ -366,7 +367,6 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) 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 @@ -395,26 +395,10 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) } } if (bitnum>16){ - - // PrintAndLog("Data start pos:%d, lastBit:%d, stop pos:%d, numBits:%d",iii,lastBit,i,bitnum); - //move BitStream back to BinStream - // ClearGraph(0); for (i=0; i < bitnum; ++i){ BinStream[i]=BitStream[i]; } *size=bitnum; - // RepaintGraphWindow(); - //output - // if (errCnt>0){ - // PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt); - // } - // PrintAndLog("ASK decoded bitstream:"); - // Now output the bitstream to the scrollback by line of 16 bits - // printBitStream2(BitStream,bitnum); - //int errCnt=0; - //errCnt=manrawdemod(BitStream,bitnum); - - // Em410xDecode(Cmd); } else return -1; return errCnt; } @@ -496,10 +480,8 @@ size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t maxCons //if lastval was 1, we have a 1->0 crossing if ( dest[idx-1]==1 ) { n=myround2((float)(n+1)/((float)(rfLen)/(float)fclow)); - //n=(n+1) / h2l_crossing_value; } else {// 0->1 crossing n=myround2((float)(n+1)/((float)(rfLen-2)/(float)fchigh)); //-2 for fudge factor - //n=(n+1) / l2h_crossing_value; } if (n == 0) n = 1; @@ -642,14 +624,14 @@ int DetectASKClock(uint8_t dest[], size_t size, int clock) //if we already have a valid clock quit for (;i<8;++i) - if (clk[i]==clock) return clock; + if (clk[i] == clock) return clock; //get high and low peak - for (i=0;ipeak){ + for (i=0; i < loopCnt; ++i){ + if(dest[i] > peak){ peak = dest[i]; } - if(dest[i]=peak) || (dest[ii]<=low)){ + 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 for (i=0; i<((int)(size/clk[clkCnt])-1); ++i){ @@ -693,7 +675,7 @@ int DetectASKClock(uint8_t dest[], size_t size, int clock) for (iii=0; iii<7;++iii){ if (bestErr[iii]peak){ + for (i=0; i < loopCnt; ++i){ + if(dest[i] > peak){ peak = dest[i]; } - if(dest[i]=peak) || (dest[ii]<=low)){ + for (ii=0; ii< loopCnt; ++ii){ + if ((dest[ii] >= 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/clk[clkCnt])-1); ++i){ + for (i=0; i < ((int)(size/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){ @@ -771,13 +753,13 @@ int DetectpskNRZClock(uint8_t dest[], size_t size, int clock) //int ratio2; //debug int ratio; //int bits; - for (iii=0; iii<7;++iii){ + for (iii=0; iii < 7; ++iii){ ratio=1000; //ratio2=1000; //debug //bits=size/clk[iii]; //debug - if (peaksdet[iii]>0){ + if (peaksdet[iii] > 0){ ratio=bestErr[iii]/peaksdet[iii]; - if (((bestErr[best]/peaksdet[best])>(ratio)+1)){ + if (((bestErr[best]/peaksdet[best]) > (ratio)+1)){ best = iii; } //ratio2=bits/peaksdet[iii]; //debug @@ -797,31 +779,31 @@ void pskCleanWave(uint8_t *bitStream, size_t size) // int loopMax = 2048; int newLow=0; int newHigh=0; - for (i=0; ihigh) high=bitStream[i]; + for (i=0; i < size; ++i){ + if (bitStream[i] < low) low=bitStream[i]; + if (bitStream[i] > high) high=bitStream[i]; } high = (int)(((high-128)*.80)+128); low = (int)(((low-128)*.90)+128); //low = (uint8_t)(((int)(low)-128)*.80)+128; - for (i=0; i=high) newHigh=1; + if (bitStream[i] <= low) newLow=1; + if (bitStream[i] >= high) newHigh=1; } return; } @@ -905,9 +887,9 @@ int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert) uint32_t gLen = *size; if (gLen > 1280) gLen=1280; // get high - for (i=0; ihigh) high = dest[i]; - if (dest[i] high) high = dest[i]; + if (dest[i] < low) low = dest[i]; } //fudge high/low bars by 25% high = (uint8_t)((((int)(high)-128)*.75)+128); @@ -930,7 +912,7 @@ int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert) //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)){ + 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) { @@ -947,12 +929,12 @@ int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert) ignorewin=*clk/8; bitnum++; //else if no bars found - }else if(dest[i]low) { + }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 + if (i >= lastBit+*clk+tol){ //clock val lastBit+=*clk; bitnum++; } @@ -964,29 +946,29 @@ int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert) if (bitnum>=1000) break; } //we got more than 64 good bits and not all errors - if ((bitnum > (64+errCnt)) && (errCnt<(maxErr))) { + if ((bitnum > (64+errCnt)) && (errCnt < (maxErr))) { //possible good read - if (errCnt==0){ + if (errCnt == 0){ bestStart = iii; - bestErrCnt=errCnt; + bestErrCnt = errCnt; break; //great read - finish } if (bestStart == iii) break; //if current run == bestErrCnt run (after exhausted testing) then finish - if (errCnt=high ) && (i>=lastBit+*clk-tol && i<=lastBit+*clk+tol)){ + if ((dest[i] >= high ) && (i>=lastBit+*clk-tol && i<=lastBit+*clk+tol)){ bitHigh=1; lastBit+=*clk; curBit=1-*invert;