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 <stdbool.h>
  13 #include <string.h>
  14 #include "ui.h"
  15 #include "graph.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   GraphTraceLen = 0;
  40
  41   if (redraw)
  42     RepaintGraphWindow();
  43
  44   return gtl;
  45 }
  46
  47 /*
  48  * Detect clock rate
  49  */
  50 int DetectClock(int peak)
  51 {
  52   int i;
  53   int clock = 0xFFFF;
  54   int lastpeak = 0;
  55
  56   /* Detect peak if we don't have one */
  57   if (!peak)
  58     for (i = 0; i < GraphTraceLen; ++i)
  59       if (GraphBuffer[i] > peak)
  60         peak = GraphBuffer[i];
  61
  62   for (i = 1; i < GraphTraceLen; ++i)
  63   {
  64     /* If this is the beginning of a peak */
  65     if (GraphBuffer[i - 1] != GraphBuffer[i] && GraphBuffer[i] == peak)
  66     {
  67       /* Find lowest difference between peaks */
  68       if (lastpeak && i - lastpeak < clock)
  69         clock = i - lastpeak;
  70       lastpeak = i;
  71     }
  72   }
  73
  74   return clock;
  75 }
  76
  77 /* Get or auto-detect clock rate */
  78 int GetClock(const char *str, int peak, int verbose)
  79 {
  80   int clock;
  81
  82   sscanf(str, "%i", &clock);
  83   if (!strcmp(str, ""))
  84     clock = 0;
  85
  86   /* Auto-detect clock */
  87   if (!clock)
  88   {
  89     clock = DetectClock(peak);
  90     /* Only print this message if we're not looping something */
  91     if (!verbose)
  92       PrintAndLog("Auto-detected clock rate: %d", clock);
  93   }
  94
  95   return clock;
  96 }
  97
  98
  99 /* A simple test to see if there is any data inside Graphbuffer.
 100 */
 101 bool HasGraphData(){
 102
 103         if ( GraphTraceLen <= 0) {
 104                 PrintAndLog("No data available, try reading something first");
 105                 return false;
 106         }
 107         return true;
 108 }