fix my understanding of REQB vs WUPB

[proxmark3-svn] / common / lfdemod.c

diff --git a/common/lfdemod.c b/common/lfdemod.c
index 46ac4924247885f9a4028d76f1e379ebf2f57f25..f13a567c6fe8cda87b1cf70248cd201603fe023f 100644 (file)
--- a/common/lfdemod.c
+++ b/common/lfdemod.c
@@ -11,8 +11,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include "lfdemod.h"
 #include <stdlib.h>
 #include <string.h>
 #include "lfdemod.h"

-
-

 uint8_t justNoise(uint8_t *BitStream, size_t size)
 {
        static const uint8_t THRESHOLD = 123;
 uint8_t justNoise(uint8_t *BitStream, size_t size)
 {
        static const uint8_t THRESHOLD = 123;


@@ -31,13 +29,13 @@ int getHiLo(uint8_t *BitStream, size_t size, int *high, int *low, uint8_t fuzzHi
        *high=0;
        *low=255;
        // get high and low thresholds 
        *high=0;
        *low=255;
        // get high and low thresholds 

-       for (int i=0; i < size; i++){
+       for (size_t i=0; i < size; i++){

                if (BitStream[i] > *high) *high = BitStream[i];
                if (BitStream[i] < *low) *low = BitStream[i];
        }
        if (*high < 123) return -1; // just noise
                if (BitStream[i] > *high) *high = BitStream[i];
                if (BitStream[i] < *low) *low = BitStream[i];
        }
        if (*high < 123) return -1; // just noise

-       *high = (int)(((*high-128)*(((float)fuzzHi)/100))+128);
-       *low = (int)(((*low-128)*(((float)fuzzLo)/100))+128);
+       *high = ((*high-128)*fuzzHi + 12800)/100;
+       *low = ((*low-128)*fuzzLo + 12800)/100;

        return 1;
 }
 
        return 1;
 }
 


@@ -58,308 +56,257 @@ uint8_t parityTest(uint32_t bits, uint8_t bitLen, uint8_t pType)
 //search for given preamble in given BitStream and return success=1 or fail=0 and startIndex and length
 uint8_t preambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_t *size, size_t *startIdx)
 {
 //search for given preamble in given BitStream and return success=1 or fail=0 and 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 Em410xDecodeOld(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[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;
+       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
 uint8_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_t *hi, uint64_t *lo)
 {
 }
 
 //by marshmellow
 //takes 1s and 0s and searches for EM410x format - output EM ID
 uint8_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_t *hi, uint64_t *lo)
 {

-  //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
-  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;
-  uint8_t FmtLen = 10;
-  *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;
-    if (*size>64) FmtLen = 22;
-    idx = *startIdx + 9;
-    for (i=0; i<FmtLen; i++){ //loop through 10 or 22 sets of 5 bits (50-10p = 40 bits or 88 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++){
-        *hi = (*hi << 1) | (*lo >> 63);
-        *lo = (*lo << 1) | (BitStream[(i*5)+ii+idx]);
-      }
-    }
-    if (errChk != 0) return 1;
-    //skip last 5 bit parity test for simplicity.
-    // *size = 64 | 128;
-  }
-  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
+       uint32_t i = 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};
+       uint32_t idx = 0;
+       uint32_t parityBits = 0;
+       uint8_t errChk = 0;
+       uint8_t FmtLen = 10;
+       *startIdx = 0;
+       errChk = preambleSearch(BitStream, preamble, sizeof(preamble), size, startIdx);
+       if (errChk == 0 || *size < 64) return 0;
+       if (*size > 64) FmtLen = 22;
+       *startIdx += 1; //get rid of 0 from preamble
+       idx = *startIdx + 9;
+       for (i=0; i<FmtLen; i++){ //loop through 10 or 22 sets of 5 bits (50-10p = 40 bits or 88 bits)
+               parityBits = bytebits_to_byte(BitStream+(i*5)+idx,5);
+               //check even parity - quit if failed
+               if (parityTest(parityBits, 5, 0) == 0) return 0;
+               //set uint64 with ID from BitStream
+               for (uint8_t ii=0; ii<4; ii++){
+                       *hi = (*hi << 1) | (*lo >> 63);
+                       *lo = (*lo << 1) | (BitStream[(i*5)+ii+idx]);
+               }
+       }
+       if (errChk != 0) return 1;
+       //skip last 5 bit parity test for simplicity.
+       // *size = 64 | 128;
+       return 0;

 }
 
 //by marshmellow
 }
 
 //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)
+//demodulates strong heavily clipped samples
+int cleanAskRawDemod(uint8_t *BinStream, size_t *size, int clk, int invert, int high, int low)

 {
 {

-       int i;
-       //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 (*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;
-       ans = getHiLo(BinStream, initLoopMax, &high, &low, 75, 75);
-       if (ans<1) return -2; //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
-       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
-       int iii = 0;
-       uint32_t gLen = *size;
-       if (gLen > 3000) gLen=3000;
-       //if 0 errors allowed then only try first 2 clock cycles as we want a low tolerance
-       if (!maxErr) gLen=*clk*2; 
-       uint8_t errCnt =0;
-       uint16_t MaxBits = 500;
-       uint32_t bestStart = *size;
-       int bestErrCnt = maxErr+1;
-       // PrintAndLog("DEBUG - lastbit - %d",lastBit);
-       // loop to find first wave that works
-       for (iii=0; 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;
-                               } else if ((BinStream[i] <= low) && ((i-lastBit) > (*clk-tol))){
-                                       //low found and we are expecting a bar
-                                       lastBit+=*clk;
-                               } else {
-                                       //mid value found or no bar supposed to be here
-                                       if ((i-lastBit)>(*clk+tol)){
-                                               //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);
-
+       size_t bitCnt=0, smplCnt=0, errCnt=0;
+       uint8_t waveHigh = 0;
+       for (size_t i=0; i < *size; i++){
+               if (BinStream[i] >= high && waveHigh){
+                       smplCnt++;
+               } else if (BinStream[i] <= low && !waveHigh){
+                       smplCnt++;
+               } else { //transition
+                       if ((BinStream[i] >= high && !waveHigh) || (BinStream[i] <= low && waveHigh)){
+                               if (smplCnt > clk-(clk/4)-1) { //full clock
+                                       if (smplCnt > clk + (clk/4)+1) { //too many samples

                                                errCnt++;
                                                errCnt++;

-                                               lastBit+=*clk;//skip over until hit too many errors
-                                               if (errCnt>(maxErr)) break;  //allow 1 error for every 1000 samples else start over
+                                               BinStream[bitCnt++]=7;
+                                       } else if (waveHigh) {
+                                               BinStream[bitCnt++] = invert;
+                                               BinStream[bitCnt++] = invert;
+                                       } else if (!waveHigh) {
+                                               BinStream[bitCnt++] = invert ^ 1;
+                                               BinStream[bitCnt++] = invert ^ 1;

                                        }
                                        }

+                                       waveHigh ^= 1;  
+                                       smplCnt = 0;
+                               } else if (smplCnt > (clk/2) - (clk/4)-1) {
+                                       if (waveHigh) {
+                                               BinStream[bitCnt++] = invert;
+                                       } else if (!waveHigh) {
+                                               BinStream[bitCnt++] = invert ^ 1;
+                                       }
+                                       waveHigh ^= 1;  
+                                       smplCnt = 0;
+                               } else if (!bitCnt) {
+                                       //first bit
+                                       waveHigh = (BinStream[i] >= high);
+                                       smplCnt = 1;
+                               } else {
+                                       smplCnt++;
+                                       //transition bit oops

                                }
                                }

-                               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<=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;
-                               }
+                       } else { //haven't hit new high or new low yet
+                               smplCnt++;

                        }
                }
        }
                        }
                }
        }

-       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 ((BinStream[i] >= high) && ((i-lastBit) > (*clk-tol))){
-                               lastBit += *clk;
-                               BinStream[bitnum] = *invert;
-                               bitnum++;
-                       } else if ((BinStream[i] <= low) && ((i-lastBit) > (*clk-tol))){
-                               //low found and we are expecting a bar
-                               lastBit+=*clk;
-                               BinStream[bitnum] = 1-*invert;
-                               bitnum++;
-                       } else {
-                               //mid value found or no bar supposed to be here
-                               if ((i-lastBit)>(*clk+tol)){
-                                       //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){
-                                               BinStream[bitnum]=77;
-                                               bitnum++;
-                                       }
+       *size = bitCnt;
+       return errCnt;
+}

 
 

-                                       lastBit+=*clk;//skip over error
-                               }
-                       }
-                       if (bitnum >=MaxBits) break;
-               }
-               *size=bitnum;
-       } else{
-               *invert=bestStart;
-               *clk=iii;
-               return -1;
+//by marshmellow
+void askAmp(uint8_t *BitStream, size_t size)
+{
+       for(size_t i = 1; i<size; i++){
+               if (BitStream[i]-BitStream[i-1]>=30) //large jump up
+                       BitStream[i]=127;
+               else if(BitStream[i]-BitStream[i-1]<=-20) //large jump down
+                       BitStream[i]=-127;

        }
        }

-       return bestErrCnt;
+       return;

 }
 
 //by marshmellow
 }
 
 //by marshmellow

-//encode binary data into binary manchester 
-int ManchesterEncode(uint8_t *BitStream, size_t size)
+//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)

 {
 {

-       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;
+       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);
+
+       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 -2; //just noise
+
+       size_t errCnt = 0;
+       // if clean clipped waves detected run alternate demod
+       if (DetectCleanAskWave(BinStream, *size, high, low)) {
+               errCnt = cleanAskRawDemod(BinStream, size, *clk, *invert, high, low);
+               if (askType) //askman
+                       return manrawdecode(BinStream, size, 0);        
+               else //askraw
+                       return errCnt;

        }
        }

-       for (; i<(size*2); i++){
-               BitStream[i] = BitStream[i+20000];
+
+       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
+       size_t MaxBits = 1024;
+       lastBit = start - *clk;
+
+       for (i = start; i < *size; ++i) {
+               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;
+               } 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;

        }
        }

-       return i;
+       *size = bitnum;
+       return errCnt;

 }
 
 //by marshmellow
 //take 10 and 01 and manchester decode
 //run through 2 times and take least errCnt
 }
 
 //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;
-       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){
-                       if(BitStream[i]==1 && (BitStream[i+1]==0)){
-                       } else if((BitStream[i]==0)&& BitStream[i+1]==1){
-                       } else {
+       uint16_t bitnum=0, MaxBits = 512, errCnt = 0;
+       size_t i, ii;
+       uint16_t bestErr = 1000, bestRun = 0;
+       if (*size < 16) return -1;
+       //find correct start position [alignment]
+       for (ii=0;ii<2;++ii){
+               for (i=ii; i<*size-3; i+=2)
+                       if (BitStream[i]==BitStream[i+1])

                                errCnt++;
                                errCnt++;

-                       }
-                       if(bitnum>MaxBits) break;
-               }
+

                if (bestErr>errCnt){
                        bestErr=errCnt;
                        bestRun=ii;
                }
                errCnt=0;
        }
                if (bestErr>errCnt){
                        bestErr=errCnt;
                        bestRun=ii;
                }
                errCnt=0;
        }

-       errCnt=bestErr;
-       if (errCnt<20){
-               ii=bestRun;
-               i=1;
-               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){
-                               BitStream[bitnum++]=1;
-                       } else {
-                               BitStream[bitnum++]=77;
-                               //errCnt++;
-                       }
-                       if(bitnum>MaxBits) break;
+       //decode
+       for (i=bestRun; i < *size-3; i+=2){
+               if(BitStream[i] == 1 && (BitStream[i+1] == 0)){
+                       BitStream[bitnum++]=invert;
+               } else if((BitStream[i] == 0) && BitStream[i+1] == 1){
+                       BitStream[bitnum++]=invert^1;
+               } else {
+                       BitStream[bitnum++]=7;

                }
                }

-               *size=bitnum;
+               if(bitnum>MaxBits) break;

        }
        }

-       return errCnt;
+       *size=bitnum;
+       return bestErr;
+}
+
+//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
 }
 
 //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

+//decodes biphase or if inverted it is AKA conditional dephase encoding AKA differential manchester encoding

 int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert)
 {
 int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert)
 {

-       uint16_t bitnum=0;
-       uint32_t errCnt =0;
-       size_t i=offset;
+       uint16_t bitnum = 0;
+       uint16_t errCnt = 0;
+       size_t i = offset;

        uint16_t MaxBits=512;
        //if not enough samples - error
        if (*size < 51) return -1;
        uint16_t MaxBits=512;
        //if not enough samples - error
        if (*size < 51) return -1;


@@ -372,8 +319,8 @@ int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert)
        if (!offsetA && offsetB) offset++;
        for (i=offset; i<*size-3; i+=2){
                //check for phase error
        if (!offsetA && offsetB) offset++;
        for (i=offset; i<*size-3; i+=2){
                //check for phase error

-               if (i<*size-3 && BitStream[i+1]==BitStream[i+2]) {
-                       BitStream[bitnum++]=77;
+               if (BitStream[i+1]==BitStream[i+2]) {
+                       BitStream[bitnum++]=7;

                        errCnt++;
                }
                if((BitStream[i]==1 && BitStream[i+1]==0) || (BitStream[i]==0 && BitStream[i+1]==1)){
                        errCnt++;
                }
                if((BitStream[i]==1 && BitStream[i+1]==0) || (BitStream[i]==0 && BitStream[i+1]==1)){


@@ -381,7 +328,7 @@ 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 {
                } 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;
                        errCnt++;
                }
                if(bitnum>MaxBits) break;


@@ -390,180 +337,7 @@ int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert)
        return errCnt;
 }
 
        return errCnt;
 }
 

-//by marshmellow
-void askAmp(uint8_t *BitStream, size_t size)
-{
-       int shift = 127;
-       int shiftedVal=0;
-       for(int i = 1; i<size; i++){
-               if (BitStream[i]-BitStream[i-1]>=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)
-{
-       uint32_t i;
-       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 -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=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;
-       //if 0 errors allowed then only try first 2 clock cycles as we want a low tolerance
-       if (!maxErr) gLen=*clk*2; 
-       uint8_t errCnt =0;
-       uint32_t bestStart = *size;
-       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=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;
-                                       midBit=0;
-                               } else if ((BinStream[i] <= low) && ((i-lastBit)>(*clk-tol))){
-                                       //low found and we are expecting a bar
-                                       lastBit+=*clk;
-                                       midBit=0;
-                               } else if ((BinStream[i]<=low) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){
-                                       //mid bar?
-                                       midBit=1;
-                               } else if ((BinStream[i]>=high) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){
-                                       //mid bar?
-                                       midBit=1;
-                               } else if ((i-lastBit)>((*clk/2)+tol) && (midBit==0)){
-                                       //no mid bar found
-                                       midBit=1;
-                               } else {
-                                       //mid value found or no bar supposed to be here
-
-                                       if ((i-lastBit)>(*clk+tol)){
-                                               //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);
-
-                                               errCnt++;
-                                               lastBit+=*clk;//skip over until hit too many errors
-                                               if (errCnt > maxErr){  
-                                                       //errCnt=0;
-                                                       break;
-                                               }
-                                       }
-                               }
-                               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<=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 overwrite BinStream
-               iii = bestStart;
-               lastBit = bestStart - *clk;
-               bitnum=0;
-               for (i = iii; i < *size; ++i) {
-                       if ((BinStream[i] >= high) && ((i-lastBit) > (*clk-tol))){
-                               lastBit += *clk;
-                               BinStream[bitnum] = *invert;
-                               bitnum++;
-                               midBit=0;
-                       } else if ((BinStream[i] <= low) && ((i-lastBit) > (*clk-tol))){
-                               //low found and we are expecting a bar
-                               lastBit+=*clk;
-                               BinStream[bitnum] = 1 - *invert;
-                               bitnum++;
-                               midBit=0;
-                       } else if ((BinStream[i]<=low) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){
-                               //mid bar?
-                               midBit=1;
-                               BinStream[bitnum] = 1 - *invert;
-                               bitnum++;
-                       } else if ((BinStream[i]>=high) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){
-                               //mid bar?
-                               midBit=1;
-                               BinStream[bitnum] = *invert;
-                               bitnum++;
-                       } else if ((i-lastBit)>((*clk/2)+tol) && (midBit==0)){
-                               //no mid bar found
-                               midBit=1;
-                               if (bitnum!=0) BinStream[bitnum] = BinStream[bitnum-1];
-                               bitnum++;
-                               
-                       } else {
-                               //mid value found or no bar supposed to be here
-                               if ((i-lastBit)>(*clk+tol)){
-                                       //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){
-                                               BinStream[bitnum]=77;
-                                               bitnum++;
-                                       }
-                                       lastBit+=*clk;//skip over error
-                               }
-                       }
-                       if (bitnum >= MaxBits) break;
-               }
-               *size=bitnum;
-       } else{
-               *invert=bestStart;
-               *clk=iii;
-               return -1;
-       }
-       return bestErrCnt;
-}
-
+// by marshmellow

 // demod gProxIIDemod 
 // error returns as -x 
 // success returns start position in BitStream
 // demod gProxIIDemod 
 // error returns as -x 
 // success returns start position in BitStream


@@ -588,8 +362,8 @@ int gProxII_Demod(uint8_t BitStream[], size_t *size)
 //translate wave to 11111100000 (1 for each short wave 0 for each long wave)
 size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow)
 {
 //translate wave to 11111100000 (1 for each short wave 0 for each long wave)
 size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow)
 {

-       uint32_t last_transition = 0;
-       uint32_t idx = 1;
+       size_t last_transition = 0;
+       size_t idx = 1;

        //uint32_t maxVal=0;
        if (fchigh==0) fchigh=10;
        if (fclow==0) fclow=8;
        //uint32_t maxVal=0;
        if (fchigh==0) fchigh=10;
        if (fclow==0) fclow=8;


@@ -618,58 +392,64 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow
                        if ((idx-last_transition)<(fclow-2)){            //0-5 = garbage noise
                                //do nothing with extra garbage
                        } else if ((idx-last_transition) < (fchigh-1)) { //6-8 = 8 waves
                        if ((idx-last_transition)<(fclow-2)){            //0-5 = garbage noise
                                //do nothing with extra garbage
                        } else if ((idx-last_transition) < (fchigh-1)) { //6-8 = 8 waves

-                               dest[numBits]=1;
-                       } else {                                                        //9+ = 10 waves
-                               dest[numBits]=0;
+                               dest[numBits++]=1;
+                       } else if ((idx-last_transition) > (fchigh+1) && !numBits) { //12 + and first bit = garbage 
+                               //do nothing with beginning garbage
+                       } else {                                         //9+ = 10 waves
+                               dest[numBits++]=0;

                        }
                        last_transition = idx;
                        }
                        last_transition = idx;

-                       numBits++;

                }
        }
        return numBits; //Actually, it returns the number of bytes, but each byte represents a bit: 1 or 0
 }
 
                }
        }
        return numBits; //Actually, it returns the number of bytes, but each byte represents a bit: 1 or 0
 }
 

-uint32_t myround2(float f)
-{
-       if (f >= 2000) return 2000;//something bad happened
-       return (uint32_t) (f + (float)0.5);
-}
-

 //translate 11111100000 to 10
 //translate 11111100000 to 10

-size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t maxConsequtiveBits,
-    uint8_t invert, uint8_t fchigh, uint8_t fclow)
+size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen,
+               uint8_t invert, uint8_t fchigh, uint8_t fclow)

 {
        uint8_t lastval=dest[0];
 {
        uint8_t lastval=dest[0];

-       uint32_t idx=0;
+       size_t idx=0;

        size_t numBits=0;
        uint32_t n=1;
        size_t numBits=0;
        uint32_t n=1;

-

        for( idx=1; idx < size; idx++) {
        for( idx=1; idx < size; idx++) {

-
-               if (dest[idx]==lastval) {
-                       n++;
-                       continue;
-               }
+               n++;
+               if (dest[idx]==lastval) continue; 
+               

                //if lastval was 1, we have a 1->0 crossing
                //if lastval was 1, we have a 1->0 crossing

-               if ( dest[idx-1]==1 ) {
-                       n=myround2((float)(n+1)/((float)(rfLen)/(float)fclow));
-               } else {// 0->1 crossing
-                       n=myround2((float)(n+1)/((float)(rfLen-1)/(float)fchigh));  //-1 for fudge factor
+               if (dest[idx-1]==1) {
+                       if (!numBits && n < rfLen/fclow) {
+                               n=0;
+                               lastval = dest[idx];
+                               continue;
+                       }
+                       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;
 
                }
                if (n == 0) n = 1;
 

-               if(n < maxConsequtiveBits) //Consecutive
-               {
-                       if(invert==0){ //invert bits
-                               memset(dest+numBits, dest[idx-1] , n);
-                       }else{
-                               memset(dest+numBits, dest[idx-1]^1 , n);
-                       }
-                       numBits += n;
-               }
+               memset(dest+numBits, dest[idx-1]^invert , n);
+               numBits += n;

                n=0;
                lastval=dest[idx];
        }//end for
                n=0;
                lastval=dest[idx];
        }//end for

+       // if valid extra bits at the end were all the same frequency - add them in
+       if (n > rfLen/fchigh) {
+               if (dest[idx-2]==1) {
+                       n = (n * fclow + rfLen/2) / rfLen;
+               } else {
+                       n = (n * fchigh + rfLen/2) / rfLen;
+               }
+               memset(dest+numBits, dest[idx-1]^invert , n);
+               numBits += n;
+       }

        return numBits;
 }
 //by marshmellow  (from holiman's base)
        return numBits;
 }
 //by marshmellow  (from holiman's base)


@@ -678,40 +458,40 @@ int fskdemod(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t invert, uint8_t
 {
        // FSK demodulator
        size = fsk_wave_demod(dest, size, fchigh, fclow);
 {
        // FSK demodulator
        size = fsk_wave_demod(dest, size, fchigh, fclow);

-       size = aggregate_bits(dest, size, rfLen, 192, invert, fchigh, fclow);
+       size = aggregate_bits(dest, size, rfLen, 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)
 {
        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 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;
+       if (justNoise(dest, *size)) return -1;
+
+       size_t numStart=0, size2=*size, startIdx=0; 
+       // FSK demodulator
+       *size = fskdemod(dest, size2,50,1,10,8); //fsk2a
+       if (*size < 96*2) 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
 }
 
 // loop to get raw paradox waveform then FSK demodulate the TAG ID from it


@@ -746,7 +526,7 @@ int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, ui
        return (int)startIdx;
 }
 
        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++)
 {
        uint32_t num = 0;
        for(int i = 0 ; i < numbits ; i++)


@@ -757,6 +537,17 @@ uint32_t bytebits_to_byte(uint8_t* src, size_t numbits)
        return num;
 }
 
        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;
 int IOdemodFSK(uint8_t *dest, size_t size)
 {
        if (justNoise(dest, size)) return -1;


@@ -789,7 +580,7 @@ int IOdemodFSK(uint8_t *dest, size_t size)
 
 // by marshmellow
 // takes a array of binary values, start position, length of bits per parity (includes parity bit),
 
 // 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 for just drop it), 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;
 size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t pType, size_t bLen)
 {
        uint32_t parityWd = 0;


@@ -801,7 +592,9 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p
                }
                j--;
                // if parity fails then return 0
                }
                j--;
                // if parity fails then return 0

-               if (parityTest(parityWd, pLen, pType) == 0) return -1;
+               if (pType != 2) {
+                       if (parityTest(parityWd, pLen, pType) == 0) return -1;
+               }

                bitCnt+=(pLen-1);
                parityWd = 0;
        }
                bitCnt+=(pLen-1);
                parityWd = 0;
        }


@@ -810,6 +603,21 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p
        return bitCnt;
 }
 
        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)
 // by marshmellow
 // FSK Demod then try to locate an AWID ID
 int AWIDdemodFSK(uint8_t *dest, size_t *size)


@@ -853,119 +661,167 @@ int PyramiddemodFSK(uint8_t *dest, size_t *size)
        return (int)startIdx;
 }
 
        return (int)startIdx;
 }
 

-
-uint8_t DetectCleanAskWave(uint8_t dest[], size_t size, int high, int low)
+// 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)

 {
 {

-       uint8_t allPeaks=1;
+       uint16_t allPeaks=1;

        uint16_t cntPeaks=0;
        uint16_t cntPeaks=0;

-       for (size_t i=20; i<255; i++){
+       size_t loopEnd = 512+60;
+       if (loopEnd > size) loopEnd = size;
+       for (size_t i=60; i<loopEnd; i++){

                if (dest[i]>low && dest[i]<high) 
                        allPeaks=0;
                else
                        cntPeaks++;
        }
                if (dest[i]>low && dest[i]<high) 
                        allPeaks=0;
                else
                        cntPeaks++;
        }

-       if (allPeaks==0){
-               if (cntPeaks>190) return 1;
+       if (allPeaks == 0){
+               if (cntPeaks > 300) return 1;

        }
        return allPeaks;
 }
 
        }
        return allPeaks;
 }
 

+// 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)
+{
+       uint8_t fndClk[] = {8,16,32,40,50,64,128};
+       size_t startwave;
+       size_t i = 0;
+       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;
+       }
+       // set clock
+       for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) {
+               if (minClk >= fndClk[clkCnt]-(fndClk[clkCnt]/8) && minClk <= fndClk[clkCnt]+1)
+                       return fndClk[clkCnt];
+       }
+       return 0;
+}
+

 // 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?
 // 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)
 {
 // 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?
 // 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<loopCnt) loopCnt = size;
-  //if we already have a valid clock quit
-  
-  for (;i<8;++i)
-    if (clk[i] == *clock) return 0;
-
-  //get high and low peak
-  int peak, low;
-  getHiLo(dest, loopCnt, &peak, &low, 75, 75);
-  
-  //test for large clean peaks
-  if (DetectCleanAskWave(dest, size, peak, low)==1){
-         uint16_t fcTest=0;
-         uint8_t mostFC=0;
-         fcTest=countFC(dest, size, &mostFC);
-         uint8_t fc1 = fcTest >> 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++){
-    if (clk[clkCnt] == 32){
-      tol=1;
-    }else{
-      tol=0;
-    }
-    bestErr[clkCnt]=1000;
-    //try lining up the peaks by moving starting point (try first 256)
-    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-ii-tol)/clk[clkCnt])-1); ++i){
-          if (dest[ii+(i*clk[clkCnt])]>=peak || dest[ii+(i*clk[clkCnt])]<=low){
-          }else if(dest[ii+(i*clk[clkCnt])-tol]>=peak || dest[ii+(i*clk[clkCnt])-tol]<=low){
-          }else if(dest[ii+(i*clk[clkCnt])+tol]>=peak || dest[ii+(i*clk[clkCnt])+tol]<=low){
-          }else{  //error no peak detected
-            errCnt++;
-          }
-        }
-        //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) {
-          *clock = clk[clkCnt];
-          return ii;
-        }
-        //if we found errors see if it is lowest so far and save it as best run
-        if(errCnt<bestErr[clkCnt]){
-          bestErr[clkCnt]=errCnt;
-          bestStart[clkCnt]=ii;
-        }
-      }
-    }
-  }
-  uint8_t iii=0;
-  uint8_t best=0;
-  for (iii=0; iii<8; ++iii){
-    if (bestErr[iii]<bestErr[best]){
-      if (bestErr[iii]==0) bestErr[iii]=1;
-      // current best bit to error ratio     vs  new bit to error ratio
-      if (((size/clk[best])/bestErr[best] < (size/clk[iii])/bestErr[iii]) ){
-        best = iii;
-      }
-    }
-  }
-  if (bestErr[best]>maxErr) return -1;
-  *clock=clk[best];
-  return bestStart[best];
+       size_t i=1;
+       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 <= loopCnt) return -1; //not enough samples
+
+       //if we already have a valid clock
+       uint8_t clockFnd=0;
+       for (;i<clkEnd;++i)
+               if (clk[i] == *clock) clockFnd = i;
+               //clock found but continue to find best startpos
+
+       //get high and low peak
+       int peak, low;
+       if (getHiLo(dest, loopCnt, &peak, &low, 75, 75) < 1) return -1;
+       
+       //test for large clean peaks
+       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]
+                               }
+                       }
+               }
+       }
+       
+       uint8_t ii;
+       uint8_t clkCnt, tol = 0;
+       uint16_t bestErr[]={1000,1000,1000,1000,1000,1000,1000,1000,1000};
+       uint8_t bestStart[]={0,0,0,0,0,0,0,0,0};
+       size_t errCnt = 0;
+       size_t arrLoc, loopEnd;
+
+       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 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; ii++){
+                       if (dest[ii] < peak && dest[ii] > low) continue;
+
+                       errCnt=0;
+                       // now that we have the first one lined up test rest of wave array
+                       loopEnd = ((size-ii-tol) / clk[clkCnt]) - 1;
+                       for (i=0; i < loopEnd; ++i){
+                               arrLoc = ii + (i * clk[clkCnt]);
+                               if (dest[arrLoc] >= peak || dest[arrLoc] <= low){
+                               }else if (dest[arrLoc-tol] >= peak || dest[arrLoc-tol] <= low){
+                               }else if (dest[arrLoc+tol] >= peak || dest[arrLoc+tol] <= low){
+                               }else{  //error no peak detected
+                                       errCnt++;
+                               }
+                       }
+                       //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<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
+                       if(errCnt<bestErr[clkCnt]){
+                               bestErr[clkCnt]=errCnt;
+                               bestStart[clkCnt]=ii;
+                       }
+               }
+       }
+       uint8_t iii;
+       uint8_t best=0;
+       for (iii=1; iii<clkEnd; ++iii){
+               if (bestErr[iii] < bestErr[best]){
+                       if (bestErr[iii] == 0) bestErr[iii]=1;
+                       // current best bit to error ratio     vs  new bit to error ratio
+                       if ( (size/clk[best])/bestErr[best] < (size/clk[iii])/bestErr[iii] ){
+                               best = iii;
+                       }
+               }
+       }
+       //if (bestErr[best] > maxErr) return -1;
+       if (!clockFnd) *clock = clk[best];
+       return bestStart[best];

 }
 
 //by marshmellow
 }
 
 //by marshmellow


@@ -973,165 +829,166 @@ int DetectASKClock(uint8_t dest[], size_t size, int *clock, int maxErr)
 // a phase shift is determined by measuring the sample length of each wave
 int DetectPSKClock(uint8_t dest[], size_t size, int clock)
 {
 // 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<loopCnt) loopCnt = size;
-
-  //if we already have a valid clock quit
-  size_t i=1;
-  for (; i < 8; ++i)
-    if (clk[i] == clock) return clock;
-
-  size_t waveStart=0, waveEnd=0, firstFullWave=0, lastClkBit=0;
-  uint8_t clkCnt, fc=0, fullWaveLen=0, tol=1;
-  uint16_t peakcnt=0, errCnt=0, waveLenCnt=0;
-  uint16_t bestErr[]={1000,1000,1000,1000,1000,1000,1000,1000,1000};
-  uint16_t peaksdet[]={0,0,0,0,0,0,0,0,0};
-  countFC(dest, size, &fc);
-  //PrintAndLog("DEBUG: FC: %d",fc);
-
-  //find first full wave
-  for (i=0; i<loopCnt; i++){
-    if (dest[i] < dest[i+1] && dest[i+1] >= 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+8){
-              //noise after a phase shift - ignore
-            } else { //phase shift before supposed to based on clock
-              errCnt++;
-            }
-          } else if (i+1 > 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];
+       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<loopCnt) loopCnt = size;
+
+       //if we already have a valid clock quit
+       size_t i=1;
+       for (; i < 8; ++i)
+               if (clk[i] == clock) return clock;
+
+       size_t waveStart=0, waveEnd=0, firstFullWave=0, lastClkBit=0;
+       uint8_t clkCnt, fc=0, fullWaveLen=0, tol=1;
+       uint16_t peakcnt=0, errCnt=0, waveLenCnt=0;
+       uint16_t bestErr[]={1000,1000,1000,1000,1000,1000,1000,1000,1000};
+       uint16_t peaksdet[]={0,0,0,0,0,0,0,0,0};
+       fc = countFC(dest, size, 0);
+       if (fc!=2 && fc!=4 && fc!=8) return -1;
+       //PrintAndLog("DEBUG: FC: %d",fc);
+
+       //find first full wave
+       for (i=0; i<loopCnt; i++){
+               if (dest[i] < dest[i+1] && dest[i+1] >= 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+8){
+                                                       //noise after a phase shift - ignore
+                                               } else { //phase shift before supposed to based on clock
+                                                       errCnt++;
+                                               }
+                                       } else if (i+1 > 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 nrz clock by reading #peaks vs no peaks(or errors)
 int DetectNRZClock(uint8_t dest[], size_t size, int clock)
 {
 }
 
 //by marshmellow
 //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[]={8,16,32,40,50,64,100,128,256};
-  int loopCnt = 4096;  //don't need to loop through entire array...
-  if (size == 0) return 0;
-  if (size<loopCnt) loopCnt = size;
-
-  //if we already have a valid clock quit
-  for (; i < 8; ++i)
-    if (clk[i] == clock) return clock;
-
-  //get high and low peak
-  int peak, low;
-  getHiLo(dest, loopCnt, &peak, &low, 75, 75);
-
-  //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<loopCnt; i++){
-       if (dest[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]<maxPeak) continue;
-
-    //try lining up the peaks by moving starting point (try first 256)
-    for (ii=0; ii< loopCnt; ++ii){
-      if ((dest[ii] >= 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];
+       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...
+       if (size == 0) return 0;
+       if (size<loopCnt) loopCnt = size;
+
+       //if we already have a valid clock quit
+       for (; i < 8; ++i)
+               if (clk[i] == clock) return clock;
+
+       //get high and low peak
+       int peak, low;
+       if (getHiLo(dest, loopCnt, &peak, &low, 75, 75) < 1) return 0;
+
+       //PrintAndLog("DEBUG: peak: %d, low: %d",peak,low);
+       size_t ii;
+       uint8_t clkCnt;
+       uint8_t tol = 0;
+       uint16_t peakcnt=0;
+       uint16_t peaksdet[]={0,0,0,0,0,0,0,0};
+       uint16_t maxPeak=0;
+       //test for large clipped waves
+       for (i=0; i<loopCnt; i++){
+               if (dest[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]<maxPeak) continue;
+
+               //try lining up the peaks by moving starting point (try first 256)
+               for (ii=0; ii< loopCnt; ++ii){
+                       if ((dest[ii] >= 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;
+       uint8_t 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
 }
 
 // by marshmellow


@@ -1142,7 +999,7 @@ void psk1TOpsk2(uint8_t *BitStream, size_t size)
        size_t i=1;
        uint8_t lastBit=BitStream[0];
        for (; i<size; i++){
        size_t i=1;
        uint8_t lastBit=BitStream[0];
        for (; i<size; i++){

-               if (BitStream[i]==77){
+               if (BitStream[i]==7){

                        //ignore errors
                } else if (lastBit!=BitStream[i]){
                        lastBit=BitStream[i];
                        //ignore errors
                } else if (lastBit!=BitStream[i]){
                        lastBit=BitStream[i];


@@ -1238,495 +1095,390 @@ int indala26decode(uint8_t *bitStream, size_t *size, uint8_t *invert)
 // there probably is a much simpler way to do this.... 
 int nrzRawDemod(uint8_t *dest, size_t *size, int *clk, int *invert, int maxErr)
 {
 // there probably is a much simpler way to do this.... 
 int nrzRawDemod(uint8_t *dest, size_t *size, int *clk, int *invert, int maxErr)
 {

-  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) && (i<lastBit+*clk-tol || i>lastBit+*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]<high && 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) && ((i<lastBit+*clk-tol) || (i>lastBit+*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 (justNoise(dest, *size)) return -1;
+       *clk = DetectNRZClock(dest, *size, *clk);
+       if (*clk==0) return -2;
+       size_t i, gLen = 4096;
+       if (gLen>*size) gLen = *size;
+       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
+                               }
+                       }
+               }
+       }
+       //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++] = 7;
+                                       errCnt++;
+                               }
+                               errBitHigh=0;
+                       } else {
+                               ignoreCnt--;
+                       }
+               } else if ((dest[i] >= high || dest[i] <= low) && (bitHigh == 0)) {
+                       //error bar found no clock...
+                       errBitHigh=1;
+               }
+               if (bitnum >= MaxBits) break;
+       }
+       *size = bitnum;
+       return bestErrCnt;

 }
 
 //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)
 {
 }
 
 //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 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};
-  uint8_t rfLensFnd = 0;
-  uint8_t lastFCcnt=0;
-  uint32_t fcCounter = 0;
-  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;
-  fcCounter=0;
-  rfCounter=0;
-  firstBitFnd=0;
-  //PrintAndLog("DEBUG: fcTol: %d",fcTol);
-  // 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 peak 
-      fcCounter++;
-      rfCounter++;
-      // if we got less than the small fc + tolerance then set it to the small fc
-      if (fcCounter < fcLow+fcTol) 
-        fcCounter = fcLow;
-      else //set it to the large fc
-        fcCounter = fcHigh;
-
-      //look for bit clock  (rf/xx)
-      if ((fcCounter<lastFCcnt || fcCounter>lastFCcnt)){
-        //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){
-              rfCnts[ii]++;
-              rfCounter=0;
-              break;
-            }
-          }
-          if (rfCounter>0 && rfLensFnd<15){
-            //PrintAndLog("DEBUG: rfCntr %d, fcCntr %d",rfCounter,fcCounter);
-            rfCnts[rfLensFnd]++;
-            rfLens[rfLensFnd++]=rfCounter;
-          }
-        } else {
-          firstBitFnd++;
-        }
-        rfCounter=0;
-        lastFCcnt=fcCounter;
-      }
-      fcCounter=0;
-    } else {
-      // count sample
-      fcCounter++;
-      rfCounter++;
-    }
-  }
-  uint8_t rfHighest=15, rfHighest2=15, rfHighest3=15;
-
-  for (i=0; i<15; i++){
-    //PrintAndLog("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;
-      rfHighest2=rfHighest;
-      rfHighest=i;
-    } else if(rfCnts[i]>rfCnts[rfHighest2]){
-      rfHighest3=rfHighest2;
-      rfHighest2=i;
-    } else if(rfCnts[i]>rfCnts[rfHighest3]){
-      rfHighest3=i;
-    }
-  }  
-  // set allowed clock remainder tolerance to be 1 large field clock length+1 
-  //   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]);
-
-  // loop to find the highest clock that has a remainder less than the tolerance
-  //   compare samples counted divided by
-  int ii=7;
-  for (; ii>=0; 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){
-          break;
-        }
-      }
-    }
-  }
-
-  if (ii<0) return 0; // oops we went too far
-
-  return clk[ii];
+       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};
+       uint8_t rfLensFnd = 0;
+       uint8_t lastFCcnt = 0;
+       uint16_t fcCounter = 0;
+       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;
+       fcCounter=0;
+       rfCounter=0;
+       firstBitFnd=0;
+       //PrintAndLog("DEBUG: fcTol: %d",fcTol);
+       // 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++){
+               fcCounter++;
+               rfCounter++;
+
+               if (BitStream[i] <= BitStream[i-1] || BitStream[i] < BitStream[i+1]) 
+                       continue;               
+               // else new peak 
+               // if we got less than the small fc + tolerance then set it to the small fc
+               if (fcCounter < fcLow+fcTol) 
+                       fcCounter = fcLow;
+               else //set it to the large fc
+                       fcCounter = fcHigh;
+
+               //look for bit clock  (rf/xx)
+               if ((fcCounter < lastFCcnt || fcCounter > lastFCcnt)){
+                       //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){
+                                               rfCnts[ii]++;
+                                               rfCounter = 0;
+                                               break;
+                                       }
+                               }
+                               if (rfCounter > 0 && rfLensFnd < 15){
+                                       //PrintAndLog("DEBUG: rfCntr %d, fcCntr %d",rfCounter,fcCounter);
+                                       rfCnts[rfLensFnd]++;
+                                       rfLens[rfLensFnd++] = rfCounter;
+                               }
+                       } else {
+                               firstBitFnd++;
+                       }
+                       rfCounter=0;
+                       lastFCcnt=fcCounter;
+               }
+               fcCounter=0;
+       }
+       uint8_t rfHighest=15, rfHighest2=15, rfHighest3=15;
+
+       for (i=0; i<15; i++){
+               //PrintAndLog("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;
+                       rfHighest2=rfHighest;
+                       rfHighest=i;
+               } else if(rfCnts[i]>rfCnts[rfHighest2]){
+                       rfHighest3=rfHighest2;
+                       rfHighest2=i;
+               } else if(rfCnts[i]>rfCnts[rfHighest3]){
+                       rfHighest3=i;
+               }
+       }  
+       // set allowed clock remainder tolerance to be 1 large field clock length+1 
+       //   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]);
+
+       // loop to find the highest clock that has a remainder less than the tolerance
+       //   compare samples counted divided by
+       int ii=7;
+       for (; ii>=0; 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){
+                                       break;
+                               }
+                       }
+               }
+       }
+
+       if (ii<0) return 0; // oops we went too far
+
+       return clk[ii];

 }
 
 //by marshmellow
 //countFC is to detect the field clock lengths.
 //counts and returns the 2 most common wave lengths
 //mainly used for FSK field clock detection
 }
 
 //by marshmellow
 //countFC is to detect the field clock lengths.
 //counts and returns the 2 most common wave lengths
 //mainly used for FSK field clock detection

-uint16_t countFC(uint8_t *BitStream, size_t size, uint8_t *mostFC)
+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 fcLensFnd = 0;
-  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])
-      break;
-
-  for (; i < size-1; i++){
-    if (BitStream[i] > BitStream[i-1] && BitStream[i] >= BitStream[i+1]){
-       // new up transition
-       fcCounter++;
-       
-      //if we had 5 and now have 9 then go back to 8 (for when we get a fc 9 instead of an 8)
-      if (lastFCcnt==5 && fcCounter==9) fcCounter--;
-      //if odd and not rc/5 add one (for when we get a fc 9 instead of 10)
-      if ((fcCounter==9 && fcCounter & 1) || fcCounter==4) 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, best2=9, best3=9;
-  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);    
-    // get the 3 best FC values
-    if (fcCnts[i]>maxCnt1) {
-      best3=best2;
-      best2=best1;
-      maxCnt1=fcCnts[i];
-      best1=i;
-    } else if(fcCnts[i]>fcCnts[best2]){
-      best3=best2;
-      best2=i;
-    } else if(fcCnts[i]>fcCnts[best3]){
-      best3=i;
-    }
-  }
-  uint8_t fcH=0, fcL=0;
-  if (fcLens[best1]>fcLens[best2]){
-    fcH=fcLens[best1];
-    fcL=fcLens[best2];
-  } else{
-    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;
-  // PrintAndLog("DEBUG: Best %d  best2 %d best3 %d",fcLens[best1],fcLens[best2],fcLens[best3]);
-  
-  return fcs;
-}
+       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;
+       uint8_t lastFCcnt=0;
+       uint8_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;

 
 

-//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]; 
+       for (; i < size-1; i++){
+               if (BitStream[i] > BitStream[i-1] && BitStream[i] >= BitStream[i+1]){
+                       // new up transition
+                       fcCounter++;
+                       if (fskAdj){
+                               //if we had 5 and now have 9 then go back to 8 (for when we get a fc 9 instead of an 8)
+                               if (lastFCcnt==5 && fcCounter==9) fcCounter--;
+                               //if fc=9 or 4 add one (for when we get a fc 9 instead of 10 or a 4 instead of a 5)
+                               if ((fcCounter==9) || fcCounter==4) fcCounter++;
+                       // save last field clock count  (fc/xx)
+                       lastFCcnt = fcCounter;
+                       }
+                       // 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, best2=9, best3=9;
+       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);    
+               // get the 3 best FC values
+               if (fcCnts[i]>maxCnt1) {
+                       best3=best2;
+                       best2=best1;
+                       maxCnt1=fcCnts[i];
+                       best1=i;
+               } else if(fcCnts[i]>fcCnts[best2]){
+                       best3=best2;
+                       best2=i;
+               } else if(fcCnts[i]>fcCnts[best3]){
+                       best3=i;
+               }
+       }
+       uint8_t fcH=0, fcL=0;
+       if (fcLens[best1]>fcLens[best2]){
+               fcH=fcLens[best1];
+               fcL=fcLens[best2];
+       } else{
+               fcH=fcLens[best2];
+               fcL=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;
+       // PrintAndLog("DEBUG: Best %d  best2 %d best3 %d",fcLens[best1],fcLens[best2],fcLens[best3]);
+       if (fskAdj) return fcs; 
+       return fcLens[best1];

 }
 
 //by marshmellow - demodulate PSK1 wave 
 //uses wave lengths (# Samples) 
 int pskRawDemod(uint8_t dest[], size_t *size, int *clock, int *invert)
 {
 }
 
 //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<loopCnt) loopCnt = *size;
-
-  uint8_t curPhase = *invert;
-  size_t i, waveStart=1, waveEnd=0, firstFullWave=0, lastClkBit=0;
-  uint8_t fc=0, fullWaveLen=0, tol=1;
-  uint16_t errCnt=0, waveLenCnt=0;
-  fc = countPSK_FC(dest, *size);
-  if (fc!=2 && fc!=4 && fc!=8) return -1;
-  //PrintAndLog("DEBUG: FC: %d",fc);
-  *clock = DetectPSKClock(dest, *size, *clock);
-  if (*clock==0) return -1;
-  int avgWaveVal=0, lastAvgWaveVal=0;
-  //find first phase shift
-  for (i=0; i<loopCnt; i++){
-    if (dest[i]+fc < dest[i+1] && dest[i+1] >= dest[i+2]){
-      waveEnd = i+1;
-      //PrintAndLog("DEBUG: waveEnd: %d",waveEnd);
-      waveLenCnt = waveEnd-waveStart;
-      if (waveLenCnt > fc && waveStart > fc){ //not first peak and is a large wave 
-        lastAvgWaveVal = avgWaveVal/(waveLenCnt);
-        firstFullWave = waveStart;
-        fullWaveLen=waveLenCnt;
-        //if average wave value is > graph 0 then it is an up wave or a 1
-        if (lastAvgWaveVal > 123) curPhase^=1;  //fudge graph 0 a little 123 vs 128
-        break;
-      } 
-      waveStart = i+1;
-      avgWaveVal = 0;
-    }
-    avgWaveVal+=dest[i+2];
-  }
-  //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;
-  errCnt=0;
-  size_t numBits=0;
-  //set skipped bits
-  memset(dest+numBits,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 
-    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;
-            lastClkBit += *clock;
-          } else if (i<lastClkBit+10+fc){
-            //noise after a phase shift - ignore
-          } else { //phase shift before supposed to based on clock
-            errCnt++;
-            dest[numBits++] = 77;
-          }
-        } else if (i+1 > lastClkBit + *clock + tol + fc){
-          lastClkBit += *clock; //no phase shift but clock bit
-          dest[numBits++] = curPhase;
-        }
-        avgWaveVal=0;
-        waveStart=i+1;
-      }
-    }
-    avgWaveVal+=dest[i+1];
-  }
-  *size = numBits;
-  return errCnt;
+       if (size == 0) return -1;
+       uint16_t loopCnt = 4096;  //don't need to loop through entire array...
+       if (*size<loopCnt) loopCnt = *size;
+
+       uint8_t curPhase = *invert;
+       size_t i, waveStart=1, waveEnd=0, firstFullWave=0, lastClkBit=0;
+       uint8_t fc=0, fullWaveLen=0, tol=1;
+       uint16_t errCnt=0, waveLenCnt=0;
+       fc = countFC(dest, *size, 0);
+       if (fc!=2 && fc!=4 && fc!=8) return -1;
+       //PrintAndLog("DEBUG: FC: %d",fc);
+       *clock = DetectPSKClock(dest, *size, *clock);
+       if (*clock == 0) return -1;
+       int avgWaveVal=0, lastAvgWaveVal=0;
+       //find first phase shift
+       for (i=0; i<loopCnt; i++){
+               if (dest[i]+fc < dest[i+1] && dest[i+1] >= dest[i+2]){
+                       waveEnd = i+1;
+                       //PrintAndLog("DEBUG: waveEnd: %d",waveEnd);
+                       waveLenCnt = waveEnd-waveStart;
+                       if (waveLenCnt > fc && waveStart > fc){ //not first peak and is a large wave 
+                               lastAvgWaveVal = avgWaveVal/(waveLenCnt);
+                               firstFullWave = waveStart;
+                               fullWaveLen=waveLenCnt;
+                               //if average wave value is > graph 0 then it is an up wave or a 1
+                               if (lastAvgWaveVal > 123) curPhase ^= 1;  //fudge graph 0 a little 123 vs 128
+                               break;
+                       } 
+                       waveStart = i+1;
+                       avgWaveVal = 0;
+               }
+               avgWaveVal += dest[i+2];
+       }
+       //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 
+               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);
+                                       //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;
+                                               lastClkBit += *clock;
+                                       } else if (i < lastClkBit+10+fc){
+                                               //noise after a phase shift - ignore
+                                       } else { //phase shift before supposed to based on clock
+                                               errCnt++;
+                                               dest[numBits++] = 7;
+                                       }
+                               } else if (i+1 > lastClkBit + *clock + tol + fc){
+                                       lastClkBit += *clock; //no phase shift but clock bit
+                                       dest[numBits++] = curPhase;
+                               }
+                               avgWaveVal = 0;
+                               waveStart = i+1;
+                       }
+               }
+               avgWaveVal += dest[i+1];
+       }
+       *size = numBits;
+       return errCnt;

 }
 }