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[proxmark3-svn] / 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 }
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