git.zerfleddert.de Git - proxmark3-svn/blob - client/graph.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // Graph utilities
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include "ui.h"
  14 #include "graph.h"
  15 #include "lfdemod.h"
  16
  17 int GraphBuffer[MAX_GRAPH_TRACE_LEN];
  18 int GraphTraceLen;
  19
  20 /* write a bit to the graph */
  21 void AppendGraph(int redraw, int clock, int bit)
  22 {
  23   int i;
  24
  25   for (i = 0; i < (int)(clock / 2); ++i)
  26     GraphBuffer[GraphTraceLen++] = bit ^ 1;
  27
  28   for (i = (int)(clock / 2); i < clock; ++i)
  29     GraphBuffer[GraphTraceLen++] = bit;
  30
  31   if (redraw)
  32     RepaintGraphWindow();
  33 }
  34
  35 /* clear out our graph window */
  36 int ClearGraph(int redraw)
  37 {
  38   int gtl = GraphTraceLen;
  39   memset(GraphBuffer, 0x00, GraphTraceLen);
  40
  41   GraphTraceLen = 0;
  42
  43   if (redraw)
  44     RepaintGraphWindow();
  45
  46   return gtl;
  47 }
  48
  49 /*
  50  * Detect clock rate
  51  */
  52  //decommissioned - has difficulty detecting rf/32
  53 /*
  54 int DetectClockOld(int peak)
  55 {
  56   int i;
  57   int clock = 0xFFFF;
  58   int lastpeak = 0;
  59
  60   // Detect peak if we don't have one
  61   if (!peak)
  62     for (i = 0; i < GraphTraceLen; ++i)
  63       if (GraphBuffer[i] > peak)
  64         peak = GraphBuffer[i];
  65
  66  // peak=(int)(peak*.75);
  67   for (i = 1; i < GraphTraceLen; ++i)
  68   {
  69     // If this is the beginning of a peak
  70     if (GraphBuffer[i - 1] != GraphBuffer[i] && GraphBuffer[i] >= peak)
  71     {
  72       // Find lowest difference between peaks
  73       if (lastpeak && i - lastpeak < clock)
  74         clock = i - lastpeak;
  75       lastpeak = i;
  76     }
  77   }
  78
  79   return clock;
  80 }
  81 */
  82 /*
  83 NOW IN LFDEMOD.C
  84
  85 // by marshmellow
  86 // not perfect especially with lower clocks or VERY good antennas (heavy wave clipping)
  87 // maybe somehow adjust peak trimming value based on samples to fix?
  88 int DetectASKClock(int peak)
  89 {
  90   int i=0;
  91   int low=0;
  92   int clk[]={16,32,40,50,64,100,128,256};
  93   int loopCnt = 256;
  94   if (GraphTraceLen<loopCnt) loopCnt = GraphTraceLen;
  95   if (!peak){
  96     for (i=0;i<loopCnt;++i){
  97       if(GraphBuffer[i]>peak){
  98         peak = GraphBuffer[i];
  99       }
 100       if(GraphBuffer[i]<low){
 101         low = GraphBuffer[i];
 102       }
 103     }
 104     peak=(int)(peak*.75);
 105     low= (int)(low*.75);
 106   }
 107   int ii;
 108   int clkCnt;
 109   int tol = 0;
 110   int bestErr=1000;
 111   int errCnt[]={0,0,0,0,0,0,0,0};
 112   for(clkCnt=0; clkCnt<6;++clkCnt){
 113     if (clk[clkCnt]==32){
 114       tol=1;
 115     }else{
 116       tol=0;
 117     }
 118     bestErr=1000;
 119     for (ii=0; ii<loopCnt; ++ii){
 120       if ((GraphBuffer[ii]>=peak) || (GraphBuffer[ii]<=low)){
 121          errCnt[clkCnt]=0;
 122         for (i=0; i<((int)(GraphTraceLen/clk[clkCnt])-1); ++i){
 123           if (GraphBuffer[ii+(i*clk[clkCnt])]>=peak || GraphBuffer[ii+(i*clk[clkCnt])]<=low){
 124           }else if(GraphBuffer[ii+(i*clk[clkCnt])-tol]>=peak || GraphBuffer[ii+(i*clk[clkCnt])-tol]<=low){
 125           }else if(GraphBuffer[ii+(i*clk[clkCnt])+tol]>=peak || GraphBuffer[ii+(i*clk[clkCnt])+tol]<=low){
 126           }else{  //error no peak detected
 127             errCnt[clkCnt]++;
 128           }
 129         }
 130         if(errCnt[clkCnt]==0) return clk[clkCnt];
 131         if(errCnt[clkCnt]<bestErr) bestErr=errCnt[clkCnt];
 132       }
 133     }
 134   }
 135   int iii=0;
 136   int best=0;
 137   for (iii=0; iii<6;++iii){
 138     if (errCnt[iii]<errCnt[best]){
 139       best = iii;
 140     }
 141   }
 142   // PrintAndLog("DEBUG: clkCnt: %d, ii: %d, i: %d peak: %d, low: %d, errcnt: %d, errCnt64: %d",clkCnt,ii,i,peak,low,errCnt[best],errCnt[4]);
 143   return clk[best];
 144 }
 145 */
 146 void setGraphBuf(uint8_t *buff,int size)
 147 {
 148   int i=0;
 149   ClearGraph(0);
 150   for (; i < size; ++i){
 151     GraphBuffer[i]=buff[i];
 152   }
 153   GraphTraceLen=size;
 154   RepaintGraphWindow();
 155   return;
 156 }
 157 int getFromGraphBuf(uint8_t *buff)
 158 {
 159   uint32_t i;
 160   for (i=0;i<GraphTraceLen;++i){
 161     if (GraphBuffer[i]>127) GraphBuffer[i]=127; //trim
 162     if (GraphBuffer[i]<-127) GraphBuffer[i]=-127; //trim
 163     buff[i]=(uint8_t)(GraphBuffer[i]+128);
 164   }
 165   return i;
 166 }
 167 /* Get or auto-detect clock rate */
 168 int GetClock(const char *str, int peak, int verbose)
 169 {
 170   int clock;
 171 //  int clock2;
 172   sscanf(str, "%i", &clock);
 173   if (!strcmp(str, ""))
 174     clock = 0;
 175
 176   /* Auto-detect clock */
 177   if (!clock)
 178   {
 179     uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
 180     int size = getFromGraphBuf(grph);
 181     clock = DetectASKClock(grph,size,0);
 182     //clock2 = DetectClock2(peak);
 183     /* Only print this message if we're not looping something */
 184     if (!verbose){
 185       PrintAndLog("Auto-detected clock rate: %d", clock);
 186       //PrintAndLog("clock2: %d",clock2);
 187     }
 188   }
 189
 190   return clock;
 191 }