- int i=0;
- int peak=0;
- int low=128;
- int clk[]={16,32,40,50,64,100,128,256};
- int loopCnt = 256; //don't need to loop through entire array...
- 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
- for (i=0;i<loopCnt;++i){
- if(dest[i]>peak){
- peak = dest[i];
- }
- if(dest[i]<low){
- low = dest[i];
- }
- }
- peak=(int)(((peak-128)*.75)+128);
- low= (int)(((low-128)*.75)+128);
- int ii;
- int clkCnt;
- int tol = 0;
- int bestErr[]={1000,1000,1000,1000,1000,1000,1000,1000};
- int errCnt=0;
- //test each valid clock from smallest to greatest to see which lines up
- for(clkCnt=0; clkCnt<6;++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/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 this is correct one - return this clock
- if(errCnt==0) return clk[clkCnt];
- //if we found errors see if it is lowest so far and save it as best run
- if(errCnt<bestErr[clkCnt]) bestErr[clkCnt]=errCnt;
- }
- }
- }
- int iii=0;
- int best=0;
- for (iii=0; iii<7;++iii){
- if (bestErr[iii]<bestErr[best]){
- // 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;
- }
- }
- }
- return clk[best];
-}
-int DetectpskNRZClock(uint8_t dest[], size_t size, int clock)
-{
- int i=0;
- int peak=0;
- int low=128;
- int clk[]={16,32,40,50,64,100,128,256};
- int loopCnt = 2048; //don't need to loop through entire array...
- 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
- for (i=0;i<loopCnt;++i){
- if(dest[i]>peak){
- peak = dest[i];
- }
- if(dest[i]<low){
- low = dest[i];
- }
- }
- peak=(int)(((peak-128)*.90)+128);
- low= (int)(((low-128)*.90)+128);
- //PrintAndLog("DEBUG: peak: %d, low: %d",peak,low);
- int ii;
- int clkCnt;
- int tol = 0;
- int peakcnt=0;
- int errCnt=0;
- int bestErr[]={1000,1000,1000,1000,1000,1000,1000,1000,1000};
- int peaksdet[]={0,0,0,0,0,0,0,0,0};
- //test each valid clock from smallest to greatest to see which lines up
- for(clkCnt=0; clkCnt<6;++clkCnt){
- if (clk[clkCnt]==32){
- tol=0;
- }else{
- tol=0;
- }
- //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;
- peakcnt=0;
- // now that we have the first one lined up test rest of wave array
- for (i=0; i<((int)(size/clk[clkCnt])-1); ++i){
- if (dest[ii+(i*clk[clkCnt])]>=peak || dest[ii+(i*clk[clkCnt])]<=low){
- peakcnt++;
- }else if(dest[ii+(i*clk[clkCnt])-tol]>=peak || dest[ii+(i*clk[clkCnt])-tol]<=low){
- peakcnt++;
- }else if(dest[ii+(i*clk[clkCnt])+tol]>=peak || dest[ii+(i*clk[clkCnt])+tol]<=low){
- peakcnt++;
- }else{ //error no peak detected
- errCnt++;
- }
- }
- if(peakcnt>peaksdet[clkCnt]) {
- peaksdet[clkCnt]=peakcnt;
- bestErr[clkCnt]=errCnt;
- }
- }
- }
- }
- int iii=0;
- int best=0;
- //int ratio2; //debug
- int ratio;
- //int bits;
- for (iii=0; iii<7;++iii){
- ratio=1000;
- //ratio2=1000; //debug
- //bits=size/clk[iii]; //debug
- if (peaksdet[iii]>0){
- ratio=bestErr[iii]/peaksdet[iii];
- if (((bestErr[best]/peaksdet[best])>(ratio)+1)){
- best = iii;
- }
- //ratio2=bits/peaksdet[iii]; //debug
- }
- //PrintAndLog("DEBUG: Clk: %d, peaks: %d, errs: %d, bestClk: %d, ratio: %d, bits: %d, peakbitr: %d",clk[iii],peaksdet[iii],bestErr[iii],clk[best],ratio, bits,ratio2);
- }
- return clk[best];
+ int i=0;
+ int peak=0;
+ int low=255;
+ int clk[]={16,32,40,50,64,100,128,256};
+ int loopCnt = 256; //don't need to loop through entire array...
+ 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
+ for (i=0; i < loopCnt; ++i){
+ if(dest[i] > peak){
+ peak = dest[i];
+ }
+ if(dest[i] < low){
+ low = dest[i];
+ }
+ }
+ peak=(int)(((peak-128)*.75)+128);
+ low= (int)(((low-128)*.75)+128);
+ int ii;
+ int clkCnt;
+ int tol = 0;
+ int bestErr[]={1000,1000,1000,1000,1000,1000,1000,1000};
+ int errCnt=0;
+ //test each valid clock from smallest to greatest to see which lines up
+ for(clkCnt=0; clkCnt < 6; ++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/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 this is correct one - return this clock
+ if(errCnt==0) return clk[clkCnt];
+ //if we found errors see if it is lowest so far and save it as best run
+ if(errCnt<bestErr[clkCnt]) bestErr[clkCnt]=errCnt;
+ }
+ }
+ }
+ int iii=0;
+ int best=0;
+ for (iii=0; iii<7;++iii){
+ if (bestErr[iii]<bestErr[best]){
+ // 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;
+ }
+ }
+ }
+ return clk[best];
projects / proxmark3-svn / blobdiff