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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 #include "lfdemod.h"
17
18 int GraphBuffer[MAX_GRAPH_TRACE_LEN];
19 int GraphTraceLen;
20
21 /* write a bit to the graph */
22 void AppendGraph(int redraw, int clock, int bit)
23 {
24 int i;
25
26 for (i = 0; i < (int)(clock / 2); ++i)
27 GraphBuffer[GraphTraceLen++] = bit ^ 1;
28
29 for (i = (int)(clock / 2); i < clock; ++i)
30 GraphBuffer[GraphTraceLen++] = bit;
31
32 if (redraw)
33 RepaintGraphWindow();
34 }
35
36 // clear out our graph window
37 int ClearGraph(int redraw)
38 {
39 int gtl = GraphTraceLen;
40 memset(GraphBuffer, 0x00, GraphTraceLen);
41
42 GraphTraceLen = 0;
43
44 if (redraw)
45 RepaintGraphWindow();
46
47 return gtl;
48 }
49
50 // DETECT CLOCK NOW IN LFDEMOD.C
51
52 void setGraphBuf(uint8_t *buff, size_t size)
53 {
54 if ( buff == NULL ) return;
55
56 uint16_t i = 0;
57 if ( size > MAX_GRAPH_TRACE_LEN )
58 size = MAX_GRAPH_TRACE_LEN;
59 ClearGraph(0);
60 for (; i < size; ++i){
61 GraphBuffer[i]=buff[i]-128;
62 }
63 GraphTraceLen=size;
64 RepaintGraphWindow();
65 return;
66 }
67 size_t getFromGraphBuf(uint8_t *buff)
68 {
69 if ( buff == NULL ) return -1;
70
71 uint32_t i;
72 for (i=0;i<GraphTraceLen;++i){
73 if (GraphBuffer[i]>127) GraphBuffer[i]=127; //trim
74 if (GraphBuffer[i]<-127) GraphBuffer[i]=-127; //trim
75 buff[i]=(uint8_t)(GraphBuffer[i]+128);
76 }
77 return i;
78 }
79 // Get or auto-detect clock rate
80 int GetClock(const char *str, int peak, int verbose)
81 {
82 int clock;
83 sscanf(str, "%i", &clock);
84 if (!strcmp(str, ""))
85 clock = 0;
86
87 // Auto-detect clock
88 if (!clock)
89 {
90 uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
91 size_t size = getFromGraphBuf(grph);
92 if ( size < 0 ) {
93 PrintAndLog("Failed to copy from graphbuffer");
94 return -1;
95 }
96 clock = DetectASKClock(grph,size,0);
97 // Only print this message if we're not looping something
98 if (!verbose){
99 PrintAndLog("Auto-detected clock rate: %d", clock);
100 }
101 return clock;
102 }
103
104 // A simple test to see if there is any data inside Graphbuffer.
105 bool HasGraphData(){
106
107 if ( GraphTraceLen <= 0) {
108 PrintAndLog("No data available, try reading something first");
109 return false;
110 }
111 return true;
112 }
113
114 // Detect high and lows in Grapbuffer.
115 // Only loops the first 256 values.
116 void DetectHighLowInGraph(int *high, int *low, bool addFuzz) {
117
118 uint8_t loopMax = 255;
119 if ( loopMax > GraphTraceLen)
120 loopMax = GraphTraceLen;
121
122 for (uint8_t i = 0; i < loopMax; ++i) {
123 if (GraphBuffer[i] > *high)
124 *high = GraphBuffer[i];
125 else if (GraphBuffer[i] < *low)
126 *low = GraphBuffer[i];
127 }
128
129 //12% fuzz in case highs and lows aren't clipped
130 if (addFuzz) {
131 *high = (int)(*high * .88);
132 *low = (int)(*low * .88);
133 }
134 }
135
136 int GetNRZpskClock(const char *str, int peak, int verbose)
137 {
138 int clock;
139 sscanf(str, "%i", &clock);
140 if (!strcmp(str, ""))
141 clock = 0;
142
143 // Auto-detect clock
144 if (!clock)
145 {
146 uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
147 size_t size = getFromGraphBuf(grph);
148 clock = DetectpskNRZClock(grph,size,0);
149 // Only print this message if we're not looping something
150 if (!verbose){
151 PrintAndLog("Auto-detected clock rate: %d", clock);
152 }
153 }
154 return clock;
155 }
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