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   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 int DetectClock(int peak)
  53 {
  54   int i;
  55   int clock = 0xFFFF;
  56   int lastpeak = 0;
  57
  58   /* Detect peak if we don't have one */
  59   if (!peak)
  60     for (i = 0; i < GraphTraceLen; ++i)
  61       if (GraphBuffer[i] > peak)
  62         peak = GraphBuffer[i];
  63
  64   for (i = 1; i < GraphTraceLen; ++i)
  65   {
  66     /* If this is the beginning of a peak */
  67     if (GraphBuffer[i - 1] != GraphBuffer[i] && GraphBuffer[i] == peak)
  68     {
  69       /* Find lowest difference between peaks */
  70       if (lastpeak && i - lastpeak < clock)
  71         clock = i - lastpeak;
  72       lastpeak = i;
  73     }
  74   }
  75
  76   return clock;
  77 }
  78
  79 /* Get or auto-detect clock rate */
  80 int GetClock(const char *str, int peak, int verbose)
  81 {
  82   int clock;
  83
  84   sscanf(str, "%i", &clock);
  85   if (!strcmp(str, ""))
  86     clock = 0;
  87
  88   /* Auto-detect clock */
  89   if (!clock)
  90   {
  91     clock = DetectClock(peak);
  92     /* Only print this message if we're not looping something */
  93     if (!verbose)
  94       PrintAndLog("Auto-detected clock rate: %d", clock);
  95   }
  96
  97   return clock;
  98 }
  99
 100
 101 /* A simple test to see if there is any data inside Graphbuffer.
 102 */
 103 bool HasGraphData(){
 104
 105         if ( GraphTraceLen <= 0) {
 106                 PrintAndLog("No data available, try reading something first");
 107                 return false;
 108         }
 109         return true;
 110 }