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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 /* write a manchester bit to the graph */
21 void AppendGraph(int redraw, int clock, int bit)
22 {
23 int i;
24 //set first half the clock bit (all 1's or 0's for a 0 or 1 bit)
25 for (i = 0; i < (int)(clock / 2); ++i)
26 GraphBuffer[GraphTraceLen++] = bit ;
27 //set second half of the clock bit (all 0's or 1's for a 0 or 1 bit)
28 for (i = (int)(clock / 2); i < clock; ++i)
29 GraphBuffer[GraphTraceLen++] = bit ^ 1;
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 // option '1' to save GraphBuffer any other to restore
49 void save_restoreGB(uint8_t saveOpt)
50 {
51 static int SavedGB[MAX_GRAPH_TRACE_LEN];
52 static int SavedGBlen;
53 static bool GB_Saved = false;
54
55 if (saveOpt==1) { //save
56 memcpy(SavedGB, GraphBuffer, sizeof(GraphBuffer));
57 SavedGBlen = GraphTraceLen;
58 GB_Saved=true;
59 } else if (GB_Saved){ //restore
60 memcpy(GraphBuffer, SavedGB, sizeof(GraphBuffer));
61 GraphTraceLen = SavedGBlen;
62 RepaintGraphWindow();
63 }
64 return;
65 }
66
67 // DETECT CLOCK NOW IN LFDEMOD.C
68
69 void setGraphBuf(uint8_t *buff, size_t size)
70 {
71 if ( buff == NULL ) return;
72
73 uint16_t i = 0;
74 if ( size > MAX_GRAPH_TRACE_LEN )
75 size = MAX_GRAPH_TRACE_LEN;
76 ClearGraph(0);
77 for (; i < size; ++i){
78 GraphBuffer[i]=buff[i]-128;
79 }
80 GraphTraceLen=size;
81 RepaintGraphWindow();
82 return;
83 }
84 size_t getFromGraphBuf(uint8_t *buff)
85 {
86 if (buff == NULL ) return 0;
87 uint32_t i;
88 for (i=0;i<GraphTraceLen;++i){
89 if (GraphBuffer[i]>127) GraphBuffer[i]=127; //trim
90 if (GraphBuffer[i]<-127) GraphBuffer[i]=-127; //trim
91 buff[i]=(uint8_t)(GraphBuffer[i]+128);
92 }
93 return i;
94 }
95
96 // A simple test to see if there is any data inside Graphbuffer.
97 bool HasGraphData(){
98
99 if ( GraphTraceLen <= 0) {
100 PrintAndLog("No data available, try reading something first");
101 return false;
102 }
103 return true;
104 }
105
106 // Detect high and lows in Grapbuffer.
107 // Only loops the first 256 values.
108 void DetectHighLowInGraph(int *high, int *low, bool addFuzz) {
109
110 uint8_t loopMax = 255;
111 if ( loopMax > GraphTraceLen)
112 loopMax = GraphTraceLen;
113
114 for (uint8_t i = 0; i < loopMax; ++i) {
115 if (GraphBuffer[i] > *high)
116 *high = GraphBuffer[i];
117 else if (GraphBuffer[i] < *low)
118 *low = GraphBuffer[i];
119 }
120
121 //12% fuzz in case highs and lows aren't clipped
122 if (addFuzz) {
123 *high = (int)(*high * .88);
124 *low = (int)(*low * .88);
125 }
126 }
127
128 // Get or auto-detect ask clock rate
129 int GetAskClock(const char str[], bool printAns, bool verbose)
130 {
131 int clock;
132 sscanf(str, "%i", &clock);
133 if (!strcmp(str, ""))
134 clock = 0;
135
136 if (clock != 0)
137 return clock;
138 // Auto-detect clock
139 uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
140 size_t size = getFromGraphBuf(grph);
141 if (size == 0) {
142 if (verbose)
143 PrintAndLog("Failed to copy from graphbuffer");
144 return -1;
145 }
146 bool st = DetectST(grph, &size, &clock);
147 int start = 0;
148 if (st == false) {
149 start = DetectASKClock(grph, size, &clock, 20);
150 }
151 // Only print this message if we're not looping something
152 if (printAns){
153 PrintAndLog("Auto-detected clock rate: %d, Best Starting Position: %d", clock, start);
154 }
155 return clock;
156 }
157
158 uint8_t GetPskCarrier(const char str[], bool printAns, bool verbose)
159 {
160 uint8_t carrier=0;
161 uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
162 size_t size = getFromGraphBuf(grph);
163 if ( size == 0 ) {
164 if (verbose)
165 PrintAndLog("Failed to copy from graphbuffer");
166 return 0;
167 }
168 //uint8_t countPSK_FC(uint8_t *BitStream, size_t size)
169
170 carrier = countFC(grph,size,0);
171 // Only print this message if we're not looping something
172 if (printAns){
173 PrintAndLog("Auto-detected PSK carrier rate: %d", carrier);
174 }
175 return carrier;
176 }
177
178 int GetPskClock(const char str[], bool printAns, bool verbose)
179 {
180 int clock;
181 sscanf(str, "%i", &clock);
182 if (!strcmp(str, ""))
183 clock = 0;
184
185 if (clock!=0) return clock;
186 // Auto-detect clock
187 uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
188 size_t size = getFromGraphBuf(grph);
189 if ( size == 0 ) {
190 if (verbose) PrintAndLog("Failed to copy from graphbuffer");
191 return -1;
192 }
193 clock = DetectPSKClock(grph,size,0);
194 // Only print this message if we're not looping something
195 if (printAns) PrintAndLog("Auto-detected clock rate: %d", clock);
196
197 return clock;
198 }
199
200 uint8_t GetNrzClock(const char str[], bool printAns, bool verbose)
201 {
202 int clock;
203 sscanf(str, "%i", &clock);
204 if (!strcmp(str, ""))
205 clock = 0;
206
207 if (clock!=0)
208 return clock;
209 // Auto-detect clock
210 uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
211 size_t size = getFromGraphBuf(grph);
212 if ( size == 0 ) {
213 if (verbose)
214 PrintAndLog("Failed to copy from graphbuffer");
215 return -1;
216 }
217 clock = DetectNRZClock(grph, size, 0);
218 // Only print this message if we're not looping something
219 if (printAns){
220 PrintAndLog("Auto-detected clock rate: %d", clock);
221 }
222 return clock;
223 }
224 //by marshmellow
225 //attempt to detect the field clock and bit clock for FSK
226 uint8_t GetFskClock(const char str[], bool printAns, bool verbose)
227 {
228 int clock;
229 sscanf(str, "%i", &clock);
230 if (!strcmp(str, ""))
231 clock = 0;
232 if (clock != 0) return (uint8_t)clock;
233
234
235 uint8_t fc1=0, fc2=0, rf1=0;
236 uint8_t ans = fskClocks(&fc1, &fc2, &rf1, verbose);
237 if (ans == 0) return 0;
238 if ((fc1==10 && fc2==8) || (fc1==8 && fc2==5)){
239 if (printAns) PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1);
240 return rf1;
241 }
242 if (verbose){
243 PrintAndLog("DEBUG: unknown fsk field clock detected");
244 PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1);
245 }
246 return 0;
247 }
248 uint8_t fskClocks(uint8_t *fc1, uint8_t *fc2, uint8_t *rf1, bool verbose)
249 {
250 uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
251 size_t size = getFromGraphBuf(BitStream);
252 if (size==0) return 0;
253 uint16_t ans = countFC(BitStream, size, 1);
254 if (ans==0) {
255 if (verbose || g_debugMode) PrintAndLog("DEBUG: No data found");
256 return 0;
257 }
258 *fc1 = (ans >> 8) & 0xFF;
259 *fc2 = ans & 0xFF;
260
261 *rf1 = detectFSKClk(BitStream, size, *fc1, *fc2);
262 if (*rf1==0) {
263 if (verbose || g_debugMode) PrintAndLog("DEBUG: Clock detect error");
264 return 0;
265 }
266 return 1;
267 }
268
269 // test samples are not just noise
270 bool graphJustNoise(int *BitStream, int size)
271 {
272 //might not be high enough for noisy environments
273 #define THRESHOLD 15;
274
275 bool isNoise = TRUE;
276 for(int i=0; i < size && isNoise; i++){
277 isNoise = BitStream[i] < THRESHOLD;
278 }
279 return isNoise;
280 }
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