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
  16 int GraphBuffer[MAX_GRAPH_TRACE_LEN];
  17 int GraphTraceLen;
  18
  19 /* write a bit to the graph */
  20 void AppendGraph(int redraw, int clock, int bit)
  21 {
  22   int i;
  23
  24   for (i = 0; i < (int)(clock / 2); ++i)
  25     GraphBuffer[GraphTraceLen++] = bit ^ 1;
  26
  27   for (i = (int)(clock / 2); i < clock; ++i)
  28     GraphBuffer[GraphTraceLen++] = bit;
  29
  30   if (redraw)
  31     RepaintGraphWindow();
  32 }
  33
  34 /* clear out our graph window */
  35 int ClearGraph(int redraw)
  36 {
  37   int gtl = GraphTraceLen;
  38   GraphTraceLen = 0;
  39
  40   if (redraw)
  41     RepaintGraphWindow();
  42
  43   return gtl;
  44 }
  45
  46 /*
  47  * Detect clock rate
  48  */
  49 int DetectClock(int peak)
  50 {
  51   int i;
  52   int clock = 0xFFFF;
  53   int lastpeak = 0;
  54
  55   /* Detect peak if we don't have one */
  56   if (!peak)
  57     for (i = 0; i < GraphTraceLen; ++i)
  58       if (GraphBuffer[i] > peak)
  59         peak = GraphBuffer[i];
  60
  61   for (i = 1; i < GraphTraceLen; ++i)
  62   {
  63     /* If this is the beginning of a peak */
  64     if (GraphBuffer[i - 1] != GraphBuffer[i] && GraphBuffer[i] == peak)
  65     {
  66       /* Find lowest difference between peaks */
  67       if (lastpeak && i - lastpeak < clock)
  68         clock = i - lastpeak;
  69       lastpeak = i;
  70     }
  71   }
  72
  73   return clock;
  74 }
  75
  76 /* Get or auto-detect clock rate */
  77 int GetClock(const char *str, int peak, int verbose)
  78 {
  79   int clock;
  80
  81   sscanf(str, "%i", &clock);
  82   if (!strcmp(str, ""))
  83     clock = 0;
  84
  85   /* Auto-detect clock */
  86   if (!clock)
  87   {
  88     clock = DetectClock(peak);
  89     /* Only print this message if we're not looping something */
  90     if (!verbose)
  91       PrintAndLog("Auto-detected clock rate: %d", clock);
  92   }
  93
  94   return clock;
  95 }