#include <stdlib.h>
#include <string.h>
#include "lfdemod.h"
-
-
uint8_t justNoise(uint8_t *BitStream, size_t size)
{
static const uint8_t THRESHOLD = 123;
*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];
}
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 quit
- return 0;
- }
+ //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);
//prints binary found and saves in graphbuffer for further commands
int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert, int maxErr)
{
- int i;
- //int clk2=*clk;
+ size_t i;
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;
+ if (*clk==0 || start < 0) return -3;
+ if (*invert != 1) *invert=0;
+ uint8_t initLoopMax = 255;
+ 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
+ int high, low;
+ if (getHiLo(BinStream, initLoopMax, &high, &low, 75, 75) < 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;
+ uint16_t bitnum = 0; //output counter
+ uint8_t tol = 0; //clock tolerance adjust - waves will be accepted as within the clock if they fall + or - this value + clock from last valid wave
+ if (*clk <= 32) tol=1; //clock tolerance may not be needed anymore currently set to + or - 1 but could be increased for poor waves or removed entirely
+ size_t iii = 0;
//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;
+ if (!maxErr) initLoopMax = *clk * 2;
+ uint16_t errCnt = 0, MaxBits = 512;
+ uint16_t bestStart = start;
+ uint16_t bestErrCnt = 0;
// 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;
+ // if best start position not already found by detect clock then
+ if (start <= 0 || start > initLoopMax){
+ bestErrCnt = maxErr+1;
+ // loop to find first wave that works
+ for (iii=0; iii < initLoopMax; ++iii){
+ // if no peak skip
+ if (BinStream[iii] < high && BinStream[iii] > low) continue;
+
+ lastBit = iii - *clk;
// 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);
-
- errCnt++;
- lastBit+=*clk;//skip over until hit too many errors
- if (errCnt>(maxErr)) break; //allow 1 error for every 1000 samples else start over
- }
+ if ((i-lastBit) > (*clk-tol) && (BinStream[i] >= high || BinStream[i] <= low)) {
+ lastBit += *clk;
+ } else if ((i-lastBit) > (*clk+tol)) {
+ errCnt++;
+ lastBit += *clk;
}
- if ((i-iii) >(MaxBits * *clk)) break; //got plenty of bits
+ if ((i-iii) > (MaxBits * *clk) || errCnt > maxErr) break; //got plenty of bits or too many errors
}
//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 (!errCnt || errCnt < bestErrCnt){
+ bestStart = iii; //set this as new best run
+ bestErrCnt = errCnt;
+ if (!errCnt) break; //great read - finish
}
}
+ errCnt = 0;
}
}
- 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++;
- }
-
- lastBit+=*clk;//skip over error
- }
- }
- if (bitnum >=MaxBits) break;
- }
- *size=bitnum;
- } else{
- *invert=bestStart;
- *clk=iii;
+ if (bestErrCnt > maxErr){
+ *invert = bestStart;
+ *clk = iii;
return -1;
+ }
+ //best run is good enough set to best run and set overwrite BinStream
+ lastBit = bestStart - *clk;
+ errCnt = 0;
+ for (i = bestStart; i < *size; ++i) {
+ if ((BinStream[i] >= high) && ((i-lastBit) > (*clk-tol))){
+ //high found and we are expecting a bar
+ lastBit += *clk;
+ BinStream[bitnum++] = *invert;
+ } else if ((BinStream[i] <= low) && ((i-lastBit) > (*clk-tol))){
+ //low found and we are expecting a bar
+ lastBit += *clk;
+ BinStream[bitnum++] = *invert ^ 1;
+ } else if ((i-lastBit)>(*clk+tol)){
+ //should have hit a high or low based on clock!!
+ //PrintAndLog("DEBUG - no wave in expected area - location: %d, expected: %d-%d, lastBit: %d - resetting search",i,(lastBit+(clk-((int)(tol)))),(lastBit+(clk+((int)(tol)))),lastBit);
+ if (bitnum > 0) {
+ BinStream[bitnum++] = 77;
+ errCnt++;
+ }
+ lastBit += *clk;//skip over error
+ }
+ if (bitnum >= MaxBits) break;
}
+ *size = bitnum;
return bestErrCnt;
}
uint16_t bestErr = 1000, bestRun = 0;
if (size == 0) return -1;
for (ii=0;ii<2;++ii){
- i=0;
- 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 {
+ for (i=ii; i<*size-2; i+=2)
+ if (BitStream[i]==BitStream[i+1])
errCnt++;
- }
- if(bitnum>MaxBits) break;
- }
+
if (bestErr>errCnt){
bestErr=errCnt;
bestRun=ii;
}
errCnt=0;
}
- errCnt=bestErr;
- if (errCnt<20){
- ii=bestRun;
- i=0;
- for (i=i+ii; i < *size-2; i+=2){
+ if (bestErr<20){
+ for (i=bestRun; 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;
}
*size=bitnum;
}
- return errCnt;
+ return bestErr;
}
//by marshmellow
//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)
{
- 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;
{
int shift = 127;
int shiftedVal=0;
- for(int i = 1; i<size; i++){
+ for(size_t 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
return;
}
+// demodulates strong heavily clipped samples
int cleanAskRawDemod(uint8_t *BinStream, size_t *size, int clk, int invert, int high, int low)
{
size_t bitCnt=0, smplCnt=0, errCnt=0;
//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;
+ if (*clk==0 || start < 0) return -1;
+ if (*invert != 1) *invert = 0;
if (amp==1) askAmp(BinStream, *size);
- uint32_t initLoopMax = 200;
+ uint8_t initLoopMax = 255;
if (initLoopMax > *size) initLoopMax=*size;
// Detect high and lows
//25% clip in case highs and lows aren't clipped [marshmellow]
- uint8_t clip = 75;
- int high, low, ans;
- ans = getHiLo(BinStream, initLoopMax, &high, &low, clip, clip);
- if (ans<1) return -1; //just noise
+ int high, low;
+ if (getHiLo(BinStream, initLoopMax, &high, &low, 75, 75) < 1)
+ return -1; //just noise
- if (DetectCleanAskWave(BinStream, *size, high, low)) {
- //PrintAndLog("Clean");
+ // if clean clipped waves detected run alternate demod
+ if (DetectCleanAskWave(BinStream, *size, high, low))
return cleanAskRawDemod(BinStream, size, *clk, *invert, high, low);
- }
- //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
+ int lastBit = 0; //set first clock check - can go negative
+ size_t i, iii = 0;
+ size_t errCnt = 0, bitnum = 0; //output counter
+ uint8_t midBit = 0;
+ size_t bestStart = start, bestErrCnt = 0; //(*size/1000);
+ size_t MaxBits = 1024;
- if ((i-lastBit)>(*clk+tol)){
+ //if 0 errors allowed then only try first 2 clock cycles as we want a low tolerance
+ if (!maxErr) initLoopMax = *clk * 2;
+ //if best start not already found by detectclock
+ if (start <= 0 || start > initLoopMax){
+ bestErrCnt = maxErr+1;
+ //PrintAndLog("DEBUG - lastbit - %d",lastBit);
+ //loop to find first wave that works
+ for (iii=0; iii < initLoopMax; ++iii){
+ if ((BinStream[iii] >= high) || (BinStream[iii] <= low)){
+ lastBit = iii - *clk;
+ //loop through to see if this start location works
+ for (i = iii; i < *size; ++i) {
+ if (i-lastBit > *clk && (BinStream[i] >= high || BinStream[i] <= low)){
+ lastBit += *clk;
+ midBit = 0;
+ } else if (i-lastBit > (*clk/2) && midBit == 0) {
+ midBit = 1;
+ } else if ((i-lastBit) > *clk) {
//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;
+ lastBit += *clk;//skip over until hit too many errors
+ if (errCnt > maxErr)
break;
- }
}
+ if ((i-iii)>(MaxBits * *clk)) break; //got enough bits
}
- 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;
+ //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;
+ }
}
+ errCnt=0;
}
}
}
- 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++;
-
+ if (bestErrCnt > maxErr){
+ *invert = bestStart;
+ *clk = iii;
+ return -1;
+ }
+ //best run is good enough - set to best run and overwrite BinStream
+ lastBit = bestStart - *clk - 1;
+ errCnt = 0;
+
+ for (i = bestStart; i < *size; ++i) {
+ if (i - lastBit > *clk){
+ if (BinStream[i] >= high) {
+ BinStream[bitnum++] = *invert;
+ } else if (BinStream[i] <= low) {
+ BinStream[bitnum++] = *invert ^ 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);
- if (bitnum > 0){
- BinStream[bitnum]=77;
- bitnum++;
- }
- lastBit+=*clk;//skip over error
- }
+ if (bitnum > 0) {
+ BinStream[bitnum++]=77;
+ errCnt++;
+ }
+ }
+ midBit = 0;
+ lastBit += *clk;
+ } else if (i-lastBit > (*clk/2) && midBit == 0){
+ if (BinStream[i] >= high) {
+ BinStream[bitnum++] = *invert;
+ } else if (BinStream[i] <= low) {
+ BinStream[bitnum++] = *invert ^ 1;
+ } else {
+
+ BinStream[bitnum] = BinStream[bitnum-1];
+ bitnum++;
}
- if (bitnum >= MaxBits) break;
+ midBit = 1;
}
- *size=bitnum;
- } else{
- *invert=bestStart;
- *clk=iii;
- return -1;
+ if (bitnum >= MaxBits) break;
}
- return bestErrCnt;
+ *size = bitnum;
+ return errCnt;
}
// demod gProxIIDemod
//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;
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;
+ 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;
+ dest[numBits++]=0;
}
last_transition = idx;
- numBits++;
}
}
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
-size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t maxConsequtiveBits,
+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];
- uint32_t idx=0;
+ size_t idx=0;
size_t numBits=0;
uint32_t n=1;
- float lowWaves = (((float)(rfLen))/((float)fclow));
- float highWaves = (((float)(rfLen))/((float)fchigh));
+ uint16_t lowWaves = ((rfLen*100/fclow)); // (((float)(rfLen))/((float)fclow));
+ uint16_t highWaves = ((rfLen*100/fchigh)); // (((float)(rfLen))/((float)fchigh));
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 (dest[idx-1]==1) {
- if (!numBits && n < (uint8_t)lowWaves) {
+ if (!numBits && n < lowWaves/100) {
n=0;
lastval = dest[idx];
continue;
}
- n=myround2(((float)n)/lowWaves);
+ n = (size_t)((((n*1000)/lowWaves)+5)/10);
} else {// 0->1 crossing
//test first bitsample too small
- if (!numBits && n < (uint8_t)highWaves) {
+ if (!numBits && n < highWaves/100) {
n=0;
lastval = dest[idx];
continue;
}
- n = myround2(((float)n)/highWaves); //-1 for fudge factor
+ n = (((n*1000)/highWaves)+5)/10;
}
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
-
// if valid extra bits at the end were all the same frequency - add them in
- if (n > lowWaves && n > highWaves) {
+ if (n > highWaves/100) {
if (dest[idx-2]==1) {
- n=myround2((float)(n+1)/((float)(rfLen)/(float)fclow));
+ n=(((n*1000)/lowWaves)+5)/10;
} else {
- n=myround2((float)(n+1)/((float)(rfLen-1)/(float)fchigh)); //-1 for fudge factor
+ n=(((n*1000)/highWaves)+5)/10;
}
- memset(dest, dest[idx-1]^invert , n);
+ memset(dest+numBits, dest[idx-1]^invert , n);
numBits += n;
}
return numBits;
{
// 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;
}
size_t numStart=0, size2=*size, startIdx=0;
// FSK demodulator
*size = fskdemod(dest, size2,50,1,10,8); //fsk2a
- if (*size < 96) return -2;
+ 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
return allPeaks;
}
+// by marshmellow
+// to help detect clocks on heavily clipped samples
+// based on counts between zero crossings
int DetectStrongAskClock(uint8_t dest[], size_t size)
{
- int clk[]={0,8,16,32,40,50,64,100,128,256};
+ int clk[]={0,8,16,32,40,50,64,100,128};
size_t idx = 40;
uint8_t high=0;
size_t cnt = 0;
// 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;
+ size_t i=0;
+ uint8_t clk[]={8,16,32,40,50,64,100,128,255};
+ 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 quit
for (;i<8;++i)
//get high and low peak
int peak, low;
- getHiLo(dest, loopCnt, &peak, &low, 75, 75);
+ if (getHiLo(dest, loopCnt, &peak, &low, 75, 75) < 1) return -1;
//test for large clean peaks
if (DetectCleanAskWave(dest, size, peak, low)==1){
int ans = DetectStrongAskClock(dest, size);
for (i=7; i>0; i--){
if (clk[i] == ans) {
- *clock=ans;
+ *clock = ans;
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;
+ 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;
//test each valid clock from smallest to greatest to see which lines up
for(clkCnt=0; clkCnt < 8; clkCnt++){
if (clk[clkCnt] == 32){
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;
+ 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
+ // 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;
+ 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]) ){
+ if ( (size/clk[best])/bestErr[best] < (size/clk[iii])/bestErr[iii] ){
best = iii;
}
}
}
- if (bestErr[best]>maxErr) return -1;
- *clock=clk[best];
+ if (bestErr[best] > maxErr) return -1;
+ *clock = clk[best];
return bestStart[best];
}
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);
+ fc = countFC(dest, size, 0);
+ if (fc!=2 && fc!=4 && fc!=8) return -1;
//PrintAndLog("DEBUG: FC: %d",fc);
//find first full wave
//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...
+ 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;
//get high and low peak
int peak, low;
- getHiLo(dest, loopCnt, &peak, &low, 75, 75);
+ if (getHiLo(dest, loopCnt, &peak, &low, 75, 75) < 1) return 0;
//PrintAndLog("DEBUG: peak: %d, low: %d",peak,low);
- int ii;
+ size_t ii;
uint8_t clkCnt;
uint8_t tol = 0;
- int peakcnt=0;
- int peaksdet[]={0,0,0,0,0,0,0,0};
- int maxPeak=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){
}
}
int iii=7;
- int best=0;
+ uint8_t best=0;
for (iii=7; iii > 0; iii--){
if (peaksdet[iii] > peaksdet[best]){
best = iii;
if (justNoise(dest, *size)) return -1;
*clk = DetectNRZClock(dest, *size, *clk);
if (*clk==0) return -2;
- uint32_t i;
- uint32_t gLen = 4096;
+ 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
- uint32_t bitnum = 0; //output counter
+ 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
- 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 bestFirstPeakHigh=0;
- uint8_t firstPeakHigh=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
+ 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)){
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;
+ // 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) {
+ } else if (dest[i] < high && dest[i] > low){
if (ignoreCnt==0){
bitHigh=0;
- if (errBitHigh==1){
- errCnt++;
- }
+ 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)){
+ } else if ((dest[i]>=high || dest[i]<=low) && (bitHigh==0)) {
//error bar found no clock...
errBitHigh=1;
}
- if (bitnum>=MaxBits) break;
+ if (((i-iii) / *clk)>=MaxBits) break;
}
//we got more than 64 good bits and not all errors
- if (bitnum > (64) && (errCnt <= (maxErr))) {
+ if (((i-iii) / *clk) > 64 && (errCnt <= (maxErr))) {
//possible good read
- if (errCnt == 0){
- //bestStart = iii;
+ if (!errCnt || peakCnt > bestPeakCnt){
bestFirstPeakHigh=firstPeakHigh;
bestErrCnt = errCnt;
bestPeakCnt = peakCnt;
bestPeakStart = iii;
- break; //great read - finish
- }
- if (errCnt < bestErrCnt){ //set this as new best run
- bestErrCnt = errCnt;
- //bestStart = iii;
+ if (!errCnt) break; //great read - finish
}
- if (peakCnt > bestPeakCnt){
- bestFirstPeakHigh=firstPeakHigh;
- 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;
- memset(dest, bestFirstPeakHigh^1, bestPeakStart / *clk);
- bitnum += (bestPeakStart / *clk);
- 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++;
+ if (bestErrCnt > maxErr) return bestErrCnt;
+
+ //best run is good enough set to best run and set overwrite BinStream
+ lastBit = bestPeakStart - *clk;
+ memset(dest, bestFirstPeakHigh^1, bestPeakStart / *clk);
+ bitnum += (bestPeakStart / *clk);
+ for (i = bestPeakStart; i < *size; ++i) {
+ // if expecting a clock bit
+ if ((i >= lastBit + *clk - tol) && (i <= lastBit + *clk + tol)) {
+ // test high/low
+ if (dest[i] >= high || dest[i] <= low) {
+ peakCnt++;
+ bitHigh = 1;
+ errBitHigh = 0;
+ ignoreCnt = ignoreWindow;
+ curBit = *invert;
+ if (dest[i] >= high) curBit ^= 1;
+ dest[bitnum++] = curBit;
+ lastBit += *clk;
+ //else no bars found in clock area
+ } else if (i == lastBit + *clk + tol) {
+ dest[bitnum++] = curBit;
+ lastBit += *clk;
+ }
+ //else if no bars found
+ } else if (dest[i] < high && dest[i] > low){
+ if (ignoreCnt == 0){
+ bitHigh = 0;
+ if (errBitHigh == 1){
+ dest[bitnum++] = 77;
+ errCnt++;
}
- //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;
+ errBitHigh=0;
+ } else {
+ ignoreCnt--;
}
- if (bitnum >= MaxBits) break;
+ } else if ((dest[i] >= high || dest[i] <= low) && (bitHigh == 0)) {
+ //error bar found no clock...
+ errBitHigh=1;
}
- *size=bitnum;
- } else{
- *size=bitnum;
- return bestErrCnt;
+ if (bitnum >= MaxBits) break;
}
-
- if (bitnum>16){
- *size=bitnum;
- } else return -5;
- return errCnt;
+ *size = bitnum;
+ return bestErrCnt;
}
//by marshmellow
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;
+ uint8_t lastFCcnt = 0;
+ uint16_t fcCounter = 0;
uint16_t rfCounter = 0;
uint8_t firstBitFnd = 0;
size_t i;
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;
+ 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;
}
- } else {
- firstBitFnd++;
}
- rfCounter=0;
- lastFCcnt=fcCounter;
+ if (rfCounter > 0 && rfLensFnd < 15){
+ //PrintAndLog("DEBUG: rfCntr %d, fcCntr %d",rfCounter,fcCounter);
+ rfCnts[rfLensFnd]++;
+ rfLens[rfLensFnd++] = rfCounter;
+ }
+ } else {
+ firstBitFnd++;
}
- fcCounter=0;
- } else {
- // count sample
- fcCounter++;
- rfCounter++;
+ rfCounter=0;
+ lastFCcnt=fcCounter;
}
+ fcCounter=0;
}
uint8_t rfHighest=15, rfHighest2=15, rfHighest3=15;
//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;
+ uint8_t fcCounter = 0;
size_t i;
if (size == 0) return 0;
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++;
-
+ 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){
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;
-}
-
-//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];
+ 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)
{
- uint16_t loopCnt = 4096; //don't need to loop through entire array...
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 = countPSK_FC(dest, *size);
+ 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;
+ if (*clock == 0) return -1;
int avgWaveVal=0, lastAvgWaveVal=0;
//find first phase shift
for (i=0; i<loopCnt; i++){
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
+ if (lastAvgWaveVal > 123) curPhase ^= 1; //fudge graph 0 a little 123 vs 128
break;
}
waveStart = i+1;
avgWaveVal = 0;
}
- avgWaveVal+=dest[i+2];
+ 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,curPhase^1,firstFullWave / *clock);
+ 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++){
+ 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;
+ waveLenCnt = 0;
avgWaveVal = dest[i+1];
} else { //waveEnd
waveEnd = i+1;
lastAvgWaveVal = avgWaveVal/waveLenCnt;
if (waveLenCnt > fc){
//PrintAndLog("DEBUG: avgWaveVal: %d, waveSum: %d",lastAvgWaveVal,avgWaveVal);
- //if this wave is a phase shift
+ //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;
+ curPhase ^= 1;
dest[numBits++] = curPhase;
lastClkBit += *clock;
- } else if (i<lastClkBit+10+fc){
+ } else if (i < lastClkBit+10+fc){
//noise after a phase shift - ignore
} else { //phase shift before supposed to based on clock
errCnt++;
lastClkBit += *clock; //no phase shift but clock bit
dest[numBits++] = curPhase;
}
- avgWaveVal=0;
- waveStart=i+1;
+ avgWaveVal = 0;
+ waveStart = i+1;
}
}
- avgWaveVal+=dest[i+1];
+ avgWaveVal += dest[i+1];
}
*size = numBits;
return errCnt;
projects / proxmark3-svn / commitdiff