return 0;
}
-// demodulates strong heavily clipped samples
+//by marshmellow
+//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;
}
//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)
+void askAmp(uint8_t *BitStream, size_t size)
{
- size_t i;
+ 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;
+}
+
+//by marshmellow
+//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)
+{
+ 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 (*invert != 1) *invert = 0;
+ if (amp==1) askAmp(BinStream, *size);
+
uint8_t initLoopMax = 255;
if (initLoopMax > *size) initLoopMax = *size;
// Detect high and lows
- // 25% fuzz in case highs and lows aren't clipped [marshmellow]
+ //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
+ 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)) {
- cleanAskRawDemod(BinStream, size, *clk, *invert, high, low);
- return manrawdecode(BinStream, size);
+ errCnt = cleanAskRawDemod(BinStream, size, *clk, *invert, high, low);
+ if (askType) //askman
+ return manrawdecode(BinStream, size, 0);
+ else //askraw
+ return errCnt;
}
- // PrintAndLog("DEBUG - valid high: %d - valid low: %d",high,low);
- int lastBit; //set first clock check
- uint16_t bitnum = 0; //output counter
+ 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
- uint16_t errCnt = 0, MaxBits = 512;
+ 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 ((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
+ 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;
- 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++] = 7;
- errCnt++;
- }
- lastBit += *clk;//skip over error
+ } 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 errCnt;
}
-//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 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, MaxBits = 512, errCnt = 0;
size_t i, ii;
uint16_t bestErr = 1000, bestRun = 0;
- if (size == 0) return -1;
+ if (*size < 16) return -1;
//find correct start position [alignment]
for (ii=0;ii<2;++ii){
- for (i=ii; i<*size-2; i+=2)
+ for (i=ii; i<*size-3; i+=2)
if (BitStream[i]==BitStream[i+1])
errCnt++;
errCnt=0;
}
//decode
- for (i=bestRun; i < *size-2; i+=2){
+ for (i=bestRun; i < *size-3; i+=2){
if(BitStream[i] == 1 && (BitStream[i+1] == 0)){
- BitStream[bitnum++]=0;
+ BitStream[bitnum++]=invert;
} else if((BitStream[i] == 0) && BitStream[i+1] == 1){
- BitStream[bitnum++]=1;
+ BitStream[bitnum++]=invert^1;
} else {
BitStream[bitnum++]=7;
}
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
return errCnt;
}
-//by marshmellow
-void askAmp(uint8_t *BitStream, size_t size)
-{
- int shift = 127;
- int shiftedVal=0;
- 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
- 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)
-{
- if (*size==0) return -1;
- int start = DetectASKClock(BinStream, *size, clk, maxErr); //clock default
- if (*clk==0 || start < 0) return -1;
- 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 -1; //just noise
-
- // if clean clipped waves detected run alternate demod
- if (DetectCleanAskWave(BinStream, *size, high, low))
- return cleanAskRawDemod(BinStream, size, *clk, *invert, high, low);
-
- int lastBit; //set first clock check - can go negative
- size_t i, errCnt = 0, bitnum = 0; //output counter
- uint8_t midBit = 0;
- size_t MaxBits = 1024;
- lastBit = start - *clk;
-
- for (i = start; i < *size; ++i) {
- if (i - lastBit == *clk){
- if (BinStream[i] >= high) {
- BinStream[bitnum++] = *invert;
- } else if (BinStream[i] <= low) {
- BinStream[bitnum++] = *invert ^ 1;
- } else {
- if (bitnum > 0) {
- BinStream[bitnum++]=7;
- 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++;
- }
- midBit = 1;
- }
- if (bitnum >= MaxBits) break;
- }
- *size = bitnum;
- return errCnt;
-}
-
+// by marshmellow
// demod gProxIIDemod
// error returns as -x
// success returns start position in BitStream
return (int)startIdx;
}
-
+// by marshmellow
+// to detect a wave that has heavily clipped (clean) samples
uint8_t DetectCleanAskWave(uint8_t dest[], size_t size, uint8_t high, uint8_t low)
{
uint16_t allPeaks=1;
//test each valid clock from smallest to greatest to see which lines up
for(; clkCnt < clkEnd; clkCnt++){
- if (clk[clkCnt] == 32){
+ if (clk[clkCnt] <= 32){
tol=1;
}else{
tol=0;
projects / proxmark3-svn / blobdiff