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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 // Data and Graph commands
9 //-----------------------------------------------------------------------------
10
11 #include <stdio.h> // also included in util.h
12 #include <string.h> // also included in util.h
13 #include <inttypes.h>
14 #include <limits.h> // for CmdNorm INT_MIN && INT_MAX
15 #include "cmddata.h"
16 #include "util.h"
17 #include "cmdmain.h"
18 #include "proxmark3.h"
19 #include "ui.h" // for show graph controls
20 #include "graph.h" // for graph data
21 #include "cmdparser.h"// already included in cmdmain.h
22 #include "usb_cmd.h" // already included in cmdmain.h and proxmark3.h
23 #include "lfdemod.h" // for demod code
24 #include "loclass/cipherutils.h" // for decimating samples in getsamples
25 #include "cmdlfem4x.h"// for em410x demod
26
27 uint8_t DemodBuffer[MAX_DEMOD_BUF_LEN];
28 uint8_t g_debugMode=0;
29 size_t DemodBufferLen=0;
30 int g_DemodStartIdx=0;
31 int g_DemodClock=0;
32
33 static int CmdHelp(const char *Cmd);
34
35 //set the demod buffer with given array of binary (one bit per byte)
36 //by marshmellow
37 void setDemodBuf(uint8_t *buff, size_t size, size_t startIdx)
38 {
39 if (buff == NULL)
40 return;
41
42 if ( size > MAX_DEMOD_BUF_LEN - startIdx)
43 size = MAX_DEMOD_BUF_LEN - startIdx;
44
45 size_t i = 0;
46 for (; i < size; i++){
47 DemodBuffer[i]=buff[startIdx++];
48 }
49 DemodBufferLen=size;
50 return;
51 }
52
53 bool getDemodBuf(uint8_t *buff, size_t *size) {
54 if (buff == NULL) return false;
55 if (size == NULL) return false;
56 if (*size == 0) return false;
57
58 *size = (*size > DemodBufferLen) ? DemodBufferLen : *size;
59
60 memcpy(buff, DemodBuffer, *size);
61 return true;
62 }
63
64 // option '1' to save DemodBuffer any other to restore
65 void save_restoreDB(uint8_t saveOpt)
66 {
67 static uint8_t SavedDB[MAX_DEMOD_BUF_LEN];
68 static size_t SavedDBlen;
69 static bool DB_Saved = false;
70 static int savedDemodStartIdx = 0;
71 static int savedDemodClock = 0;
72
73 if (saveOpt == GRAPH_SAVE) { //save
74
75 memcpy(SavedDB, DemodBuffer, sizeof(DemodBuffer));
76 SavedDBlen = DemodBufferLen;
77 DB_Saved=true;
78 savedDemodStartIdx = g_DemodStartIdx;
79 savedDemodClock = g_DemodClock;
80 } else if (DB_Saved) { //restore
81 memcpy(DemodBuffer, SavedDB, sizeof(DemodBuffer));
82 DemodBufferLen = SavedDBlen;
83 g_DemodClock = savedDemodClock;
84 g_DemodStartIdx = savedDemodStartIdx;
85 }
86 return;
87 }
88
89 int CmdSetDebugMode(const char *Cmd)
90 {
91 int demod=0;
92 sscanf(Cmd, "%i", &demod);
93 g_debugMode=(uint8_t)demod;
94 return 1;
95 }
96
97 int usage_data_printdemodbuf(){
98 PrintAndLog("Usage: data printdemodbuffer x o <offset> l <length>");
99 PrintAndLog("Options: ");
100 PrintAndLog(" h This help");
101 PrintAndLog(" x output in hex (omit for binary output)");
102 PrintAndLog(" o <offset> enter offset in # of bits");
103 PrintAndLog(" l <length> enter length to print in # of bits or hex characters respectively");
104 return 0;
105 }
106
107 //by marshmellow
108 void printDemodBuff(void)
109 {
110 int bitLen = DemodBufferLen;
111 if (bitLen<1) {
112 PrintAndLog("no bits found in demod buffer");
113 return;
114 }
115 if (bitLen>512) bitLen=512; //max output to 512 bits if we have more - should be plenty
116
117 char *bin = sprint_bin_break(DemodBuffer,bitLen,16);
118 PrintAndLog("%s",bin);
119
120 return;
121 }
122
123 int CmdPrintDemodBuff(const char *Cmd)
124 {
125 char hex[512]={0x00};
126 bool hexMode = false;
127 bool errors = false;
128 uint32_t offset = 0; //could be size_t but no param_get16...
129 uint32_t length = 512;
130 char cmdp = 0;
131 while(param_getchar(Cmd, cmdp) != 0x00)
132 {
133 switch(param_getchar(Cmd, cmdp))
134 {
135 case 'h':
136 case 'H':
137 return usage_data_printdemodbuf();
138 case 'x':
139 case 'X':
140 hexMode = true;
141 cmdp++;
142 break;
143 case 'o':
144 case 'O':
145 offset = param_get32ex(Cmd, cmdp+1, 0, 10);
146 if (!offset) errors = true;
147 cmdp += 2;
148 break;
149 case 'l':
150 case 'L':
151 length = param_get32ex(Cmd, cmdp+1, 512, 10);
152 if (!length) errors = true;
153 cmdp += 2;
154 break;
155 default:
156 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
157 errors = true;
158 break;
159 }
160 if(errors) break;
161 }
162 //Validations
163 if(errors) return usage_data_printdemodbuf();
164 length = (length > (DemodBufferLen-offset)) ? DemodBufferLen-offset : length;
165 int numBits = (length) & 0x00FFC; //make sure we don't exceed our string
166
167 if (hexMode){
168 char *buf = (char *) (DemodBuffer + offset);
169 numBits = (numBits > sizeof(hex)) ? sizeof(hex) : numBits;
170 numBits = binarraytohex(hex, buf, numBits);
171 if (numBits==0) return 0;
172 PrintAndLog("DemodBuffer: %s",hex);
173 } else {
174 PrintAndLog("DemodBuffer:\n%s", sprint_bin_break(DemodBuffer+offset,numBits,16));
175 }
176 return 1;
177 }
178
179 //by marshmellow
180 //this function strictly converts >1 to 1 and <1 to 0 for each sample in the graphbuffer
181 int CmdGetBitStream(const char *Cmd)
182 {
183 int i;
184 CmdHpf(Cmd);
185 for (i = 0; i < GraphTraceLen; i++) {
186 if (GraphBuffer[i] >= 1) {
187 GraphBuffer[i] = 1;
188 } else {
189 GraphBuffer[i] = 0;
190 }
191 }
192 RepaintGraphWindow();
193 return 0;
194 }
195
196 //by marshmellow
197 //Cmd Args: Clock, invert, maxErr, maxLen as integers and amplify as char == 'a'
198 // (amp may not be needed anymore)
199 //verbose will print results and demoding messages
200 //emSearch will auto search for EM410x format in bitstream
201 //askType switches decode: ask/raw = 0, ask/manchester = 1
202 int ASKDemod_ext(const char *Cmd, bool verbose, bool emSearch, uint8_t askType, bool *stCheck) {
203 int invert=0;
204 int clk=0;
205 int maxErr=100;
206 int maxLen=0;
207 uint8_t askamp = 0;
208 char amp = param_getchar(Cmd, 0);
209 uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
210 sscanf(Cmd, "%i %i %i %i %c", &clk, &invert, &maxErr, &maxLen, &amp);
211 if (!maxLen) maxLen = BIGBUF_SIZE;
212 if (invert != 0 && invert != 1) {
213 PrintAndLog("Invalid argument: %s", Cmd);
214 return 0;
215 }
216 if (clk==1){
217 invert=1;
218 clk=0;
219 }
220 size_t BitLen = getFromGraphBuf(BitStream);
221 if (g_debugMode) PrintAndLog("DEBUG: Bitlen from grphbuff: %d",BitLen);
222 if (BitLen < 255) return 0;
223 if (maxLen < BitLen && maxLen != 0) BitLen = maxLen;
224 int foundclk = 0;
225 //amp before ST check
226 if (amp == 'a' || amp == 'A') {
227 askAmp(BitStream, BitLen);
228 }
229 bool st = false;
230 size_t ststart = 0, stend = 0;
231 if (*stCheck) st = DetectST(BitStream, &BitLen, &foundclk, &ststart, &stend);
232 *stCheck = st;
233 if (st) {
234 clk = (clk == 0) ? foundclk : clk;
235 CursorCPos = ststart;
236 CursorDPos = stend;
237 if (verbose || g_debugMode) PrintAndLog("\nFound Sequence Terminator - First one is shown by orange and blue graph markers");
238 //Graph ST trim (for testing)
239 //for (int i = 0; i < BitLen; i++) {
240 // GraphBuffer[i] = BitStream[i]-128;
241 //}
242 //RepaintGraphWindow();
243 }
244 int startIdx = 0;
245 int errCnt = askdemod_ext(BitStream, &BitLen, &clk, &invert, maxErr, askamp, askType, &startIdx);
246 if (errCnt<0 || BitLen<16){ //if fatal error (or -1)
247 if (g_debugMode) PrintAndLog("DEBUG: no data found %d, errors:%d, bitlen:%d, clock:%d",errCnt,invert,BitLen,clk);
248 return 0;
249 }
250 if (errCnt > maxErr){
251 if (g_debugMode) PrintAndLog("DEBUG: Too many errors found, errors:%d, bits:%d, clock:%d",errCnt, BitLen, clk);
252 return 0;
253 }
254 if (verbose || g_debugMode) PrintAndLog("\nUsing Clock:%d, Invert:%d, Bits Found:%d",clk,invert,BitLen);
255 //output
256 setDemodBuf(BitStream,BitLen,0);
257 setClockGrid(clk, startIdx);
258
259 if (verbose || g_debugMode){
260 if (errCnt>0) PrintAndLog("# Errors during Demoding (shown as 7 in bit stream): %d",errCnt);
261 if (askType) PrintAndLog("ASK/Manchester - Clock: %d - Decoded bitstream:",clk);
262 else PrintAndLog("ASK/Raw - Clock: %d - Decoded bitstream:",clk);
263 // Now output the bitstream to the scrollback by line of 16 bits
264 printDemodBuff();
265
266 }
267 uint64_t lo = 0;
268 uint32_t hi = 0;
269 if (emSearch){
270 AskEm410xDecode(true, &hi, &lo);
271 }
272 return 1;
273 }
274 int ASKDemod(const char *Cmd, bool verbose, bool emSearch, uint8_t askType) {
275 bool st = false;
276 return ASKDemod_ext(Cmd, verbose, emSearch, askType, &st);
277 }
278
279 //by marshmellow
280 //takes 5 arguments - clock, invert, maxErr, maxLen as integers and amplify as char == 'a'
281 //attempts to demodulate ask while decoding manchester
282 //prints binary found and saves in graphbuffer for further commands
283 int Cmdaskmandemod(const char *Cmd)
284 {
285 char cmdp = param_getchar(Cmd, 0);
286 if (strlen(Cmd) > 45 || cmdp == 'h' || cmdp == 'H') {
287 PrintAndLog("Usage: data rawdemod am <s> [clock] <invert> [maxError] [maxLen] [amplify]");
288 PrintAndLog(" ['s'] optional, check for Sequence Terminator");
289 PrintAndLog(" [set clock as integer] optional, if not set, autodetect");
290 PrintAndLog(" <invert>, 1 to invert output");
291 PrintAndLog(" [set maximum allowed errors], default = 100");
292 PrintAndLog(" [set maximum Samples to read], default = 32768 (512 bits at rf/64)");
293 PrintAndLog(" <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
294 PrintAndLog("");
295 PrintAndLog(" sample: data rawdemod am = demod an ask/manchester tag from GraphBuffer");
296 PrintAndLog(" : data rawdemod am 32 = demod an ask/manchester tag from GraphBuffer using a clock of RF/32");
297 PrintAndLog(" : data rawdemod am 32 1 = demod an ask/manchester tag from GraphBuffer using a clock of RF/32 and inverting data");
298 PrintAndLog(" : data rawdemod am 1 = demod an ask/manchester tag from GraphBuffer while inverting data");
299 PrintAndLog(" : data rawdemod am 64 1 0 = demod an ask/manchester tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
300 return 0;
301 }
302 bool st = true;
303 if (Cmd[0]=='s')
304 return ASKDemod_ext(Cmd++, true, false, 1, &st);
305 else if (Cmd[1] == 's')
306 return ASKDemod_ext(Cmd+=2, true, false, 1, &st);
307 else
308 return ASKDemod(Cmd, true, false, 1);
309 }
310
311 //by marshmellow
312 //manchester decode
313 //stricktly take 10 and 01 and convert to 0 and 1
314 int Cmdmandecoderaw(const char *Cmd)
315 {
316 int i =0;
317 int errCnt=0;
318 size_t size=0;
319 int invert=0;
320 int maxErr = 20;
321 char cmdp = param_getchar(Cmd, 0);
322 if (strlen(Cmd) > 5 || cmdp == 'h' || cmdp == 'H') {
323 PrintAndLog("Usage: data manrawdecode [invert] [maxErr]");
324 PrintAndLog(" Takes 10 and 01 and converts to 0 and 1 respectively");
325 PrintAndLog(" --must have binary sequence in demodbuffer (run data askrawdemod first)");
326 PrintAndLog(" [invert] invert output");
327 PrintAndLog(" [maxErr] set number of errors allowed (default = 20)");
328 PrintAndLog("");
329 PrintAndLog(" sample: data manrawdecode = decode manchester bitstream from the demodbuffer");
330 return 0;
331 }
332 if (DemodBufferLen==0) return 0;
333 uint8_t BitStream[MAX_DEMOD_BUF_LEN]={0};
334 int high=0,low=0;
335 for (;i<DemodBufferLen;++i){
336 if (DemodBuffer[i]>high) high=DemodBuffer[i];
337 else if(DemodBuffer[i]<low) low=DemodBuffer[i];
338 BitStream[i]=DemodBuffer[i];
339 }
340 if (high>7 || low <0 ){
341 PrintAndLog("Error: please raw demod the wave first then manchester raw decode");
342 return 0;
343 }
344
345 sscanf(Cmd, "%i %i", &invert, &maxErr);
346 size=i;
347 uint8_t alignPos = 0;
348 errCnt=manrawdecode(BitStream, &size, invert, &alignPos);
349 if (errCnt>=maxErr){
350 PrintAndLog("Too many errors: %d",errCnt);
351 return 0;
352 }
353 PrintAndLog("Manchester Decoded - # errors:%d - data:",errCnt);
354 PrintAndLog("%s", sprint_bin_break(BitStream, size, 16));
355 if (errCnt==0){
356 uint64_t id = 0;
357 uint32_t hi = 0;
358 size_t idx=0;
359 if (Em410xDecode(BitStream, &size, &idx, &hi, &id)){
360 //need to adjust to set bitstream back to manchester encoded data
361 //setDemodBuf(BitStream, size, idx);
362
363 printEM410x(hi, id);
364 }
365 }
366 return 1;
367 }
368
369 //by marshmellow
370 //biphase decode
371 //take 01 or 10 = 0 and 11 or 00 = 1
372 //takes 2 arguments "offset" default = 0 if 1 it will shift the decode by one bit
373 // and "invert" default = 0 if 1 it will invert output
374 // the argument offset allows us to manually shift if the output is incorrect - [EDIT: now auto detects]
375 int CmdBiphaseDecodeRaw(const char *Cmd)
376 {
377 size_t size=0;
378 int offset=0, invert=0, maxErr=20, errCnt=0;
379 char cmdp = param_getchar(Cmd, 0);
380 if (strlen(Cmd) > 3 || cmdp == 'h' || cmdp == 'H') {
381 PrintAndLog("Usage: data biphaserawdecode [offset] [invert] [maxErr]");
382 PrintAndLog(" Converts 10 or 01 to 1 and 11 or 00 to 0");
383 PrintAndLog(" --must have binary sequence in demodbuffer (run data askrawdemod first)");
384 PrintAndLog(" --invert for Conditional Dephase Encoding (CDP) AKA Differential Manchester");
385 PrintAndLog("");
386 PrintAndLog(" [offset <0|1>], set to 0 not to adjust start position or to 1 to adjust decode start position");
387 PrintAndLog(" [invert <0|1>], set to 1 to invert output");
388 PrintAndLog(" [maxErr int], set max errors tolerated - default=20");
389 PrintAndLog("");
390 PrintAndLog(" sample: data biphaserawdecode = decode biphase bitstream from the demodbuffer");
391 PrintAndLog(" sample: data biphaserawdecode 1 1 = decode biphase bitstream from the demodbuffer, set offset, and invert output");
392 return 0;
393 }
394 sscanf(Cmd, "%i %i %i", &offset, &invert, &maxErr);
395 if (DemodBufferLen==0) {
396 PrintAndLog("DemodBuffer Empty - run 'data rawdemod ar' first");
397 return 0;
398 }
399 uint8_t BitStream[MAX_DEMOD_BUF_LEN]={0};
400 size = sizeof(BitStream);
401 if ( !getDemodBuf(BitStream, &size) ) return 0;
402 errCnt=BiphaseRawDecode(BitStream, &size, &offset, invert);
403 if (errCnt<0){
404 PrintAndLog("Error during decode:%d", errCnt);
405 return 0;
406 }
407 if (errCnt>maxErr){
408 PrintAndLog("Too many errors attempting to decode: %d",errCnt);
409 return 0;
410 }
411
412 if (errCnt>0){
413 PrintAndLog("# Errors found during Demod (shown as 7 in bit stream): %d",errCnt);
414 }
415
416 PrintAndLog("Biphase Decoded using offset: %d - # invert:%d - data:",offset,invert);
417 PrintAndLog("%s", sprint_bin_break(BitStream, size, 16));
418
419 if (offset) setDemodBuf(DemodBuffer,DemodBufferLen-offset, offset); //remove first bit from raw demod
420 setClockGrid(g_DemodClock, g_DemodStartIdx + g_DemodClock*offset/2);
421 return 1;
422 }
423
424 //by marshmellow
425 // - ASK Demod then Biphase decode GraphBuffer samples
426 int ASKbiphaseDemod(const char *Cmd, bool verbose)
427 {
428 //ask raw demod GraphBuffer first
429 int offset=0, clk=0, invert=0, maxErr=0;
430 sscanf(Cmd, "%i %i %i %i", &offset, &clk, &invert, &maxErr);
431
432 uint8_t BitStream[MAX_GRAPH_TRACE_LEN];
433 size_t size = getFromGraphBuf(BitStream);
434 int startIdx = 0;
435 //invert here inverts the ask raw demoded bits which has no effect on the demod, but we need the pointer
436 int errCnt = askdemod_ext(BitStream, &size, &clk, &invert, maxErr, 0, 0, &startIdx);
437 if ( errCnt < 0 || errCnt > maxErr ) {
438 if (g_debugMode) PrintAndLog("DEBUG: no data or error found %d, clock: %d", errCnt, clk);
439 return 0;
440 }
441
442 //attempt to Biphase decode BitStream
443 errCnt = BiphaseRawDecode(BitStream, &size, &offset, invert);
444 if (errCnt < 0){
445 if (g_debugMode || verbose) PrintAndLog("Error BiphaseRawDecode: %d", errCnt);
446 return 0;
447 }
448 if (errCnt > maxErr) {
449 if (g_debugMode || verbose) PrintAndLog("Error BiphaseRawDecode too many errors: %d", errCnt);
450 return 0;
451 }
452 //success set DemodBuffer and return
453 setDemodBuf(BitStream, size, 0);
454 setClockGrid(clk, startIdx + clk*offset/2);
455 if (g_debugMode || verbose){
456 PrintAndLog("Biphase Decoded using offset: %d - clock: %d - # errors:%d - data:",offset,clk,errCnt);
457 printDemodBuff();
458 }
459 return 1;
460 }
461 //by marshmellow - see ASKbiphaseDemod
462 int Cmdaskbiphdemod(const char *Cmd)
463 {
464 char cmdp = param_getchar(Cmd, 0);
465 if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
466 PrintAndLog("Usage: data rawdemod ab [offset] [clock] <invert> [maxError] [maxLen] <amplify>");
467 PrintAndLog(" [offset], offset to begin biphase, default=0");
468 PrintAndLog(" [set clock as integer] optional, if not set, autodetect");
469 PrintAndLog(" <invert>, 1 to invert output");
470 PrintAndLog(" [set maximum allowed errors], default = 100");
471 PrintAndLog(" [set maximum Samples to read], default = 32768 (512 bits at rf/64)");
472 PrintAndLog(" <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
473 PrintAndLog(" NOTE: <invert> can be entered as second or third argument");
474 PrintAndLog(" NOTE: <amplify> can be entered as first, second or last argument");
475 PrintAndLog(" NOTE: any other arg must have previous args set to work");
476 PrintAndLog("");
477 PrintAndLog(" NOTE: --invert for Conditional Dephase Encoding (CDP) AKA Differential Manchester");
478 PrintAndLog("");
479 PrintAndLog(" sample: data rawdemod ab = demod an ask/biph tag from GraphBuffer");
480 PrintAndLog(" : data rawdemod ab 0 a = demod an ask/biph tag from GraphBuffer, amplified");
481 PrintAndLog(" : data rawdemod ab 1 32 = demod an ask/biph tag from GraphBuffer using an offset of 1 and a clock of RF/32");
482 PrintAndLog(" : data rawdemod ab 0 32 1 = demod an ask/biph tag from GraphBuffer using a clock of RF/32 and inverting data");
483 PrintAndLog(" : data rawdemod ab 0 1 = demod an ask/biph tag from GraphBuffer while inverting data");
484 PrintAndLog(" : data rawdemod ab 0 64 1 0 = demod an ask/biph tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
485 PrintAndLog(" : data rawdemod ab 0 64 1 0 0 a = demod an ask/biph tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors, and amp");
486 return 0;
487 }
488 return ASKbiphaseDemod(Cmd, true);
489 }
490
491 //by marshmellow - see ASKDemod
492 int Cmdaskrawdemod(const char *Cmd)
493 {
494 char cmdp = param_getchar(Cmd, 0);
495 if (strlen(Cmd) > 35 || cmdp == 'h' || cmdp == 'H') {
496 PrintAndLog("Usage: data rawdemod ar [clock] <invert> [maxError] [maxLen] [amplify]");
497 PrintAndLog(" [set clock as integer] optional, if not set, autodetect");
498 PrintAndLog(" <invert>, 1 to invert output");
499 PrintAndLog(" [set maximum allowed errors], default = 100");
500 PrintAndLog(" [set maximum Samples to read], default = 32768 (1024 bits at rf/64)");
501 PrintAndLog(" <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
502 PrintAndLog("");
503 PrintAndLog(" sample: data rawdemod ar = demod an ask tag from GraphBuffer");
504 PrintAndLog(" : data rawdemod ar a = demod an ask tag from GraphBuffer, amplified");
505 PrintAndLog(" : data rawdemod ar 32 = demod an ask tag from GraphBuffer using a clock of RF/32");
506 PrintAndLog(" : data rawdemod ar 32 1 = demod an ask tag from GraphBuffer using a clock of RF/32 and inverting data");
507 PrintAndLog(" : data rawdemod ar 1 = demod an ask tag from GraphBuffer while inverting data");
508 PrintAndLog(" : data rawdemod ar 64 1 0 = demod an ask tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
509 PrintAndLog(" : data rawdemod ar 64 1 0 0 a = demod an ask tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors, and amp");
510 return 0;
511 }
512 return ASKDemod(Cmd, true, false, 0);
513 }
514
515 int AutoCorrelate(const int *in, int *out, size_t len, int window, bool SaveGrph, bool verbose)
516 {
517 static int CorrelBuffer[MAX_GRAPH_TRACE_LEN];
518 size_t Correlation = 0;
519 int maxSum = 0;
520 int lastMax = 0;
521 if (verbose) PrintAndLog("performing %d correlations", GraphTraceLen - window);
522 for (int i = 0; i < len - window; ++i) {
523 int sum = 0;
524 for (int j = 0; j < window; ++j) {
525 sum += (in[j]*in[i + j]) / 256;
526 }
527 CorrelBuffer[i] = sum;
528 if (sum >= maxSum-100 && sum <= maxSum+100) {
529 //another max
530 Correlation = i-lastMax;
531 lastMax = i;
532 if (sum > maxSum) maxSum = sum;
533 } else if (sum > maxSum) {
534 maxSum=sum;
535 lastMax = i;
536 }
537 }
538 if (Correlation==0) {
539 //try again with wider margin
540 for (int i = 0; i < len - window; i++) {
541 if (CorrelBuffer[i] >= maxSum-(maxSum*0.05) && CorrelBuffer[i] <= maxSum+(maxSum*0.05)) {
542 //another max
543 Correlation = i-lastMax;
544 lastMax = i;
545 }
546 }
547 }
548 if (verbose && Correlation > 0) PrintAndLog("Possible Correlation: %d samples",Correlation);
549
550 if (SaveGrph) {
551 //GraphTraceLen = GraphTraceLen - window;
552 memcpy(out, CorrelBuffer, len * sizeof(int));
553 RepaintGraphWindow();
554 }
555 return Correlation;
556 }
557
558 int usage_data_autocorr(void)
559 {
560 //print help
561 PrintAndLog("Usage: data autocorr [window] [g]");
562 PrintAndLog("Options: ");
563 PrintAndLog(" h This help");
564 PrintAndLog(" [window] window length for correlation - default = 4000");
565 PrintAndLog(" g save back to GraphBuffer (overwrite)");
566 return 0;
567 }
568
569 int CmdAutoCorr(const char *Cmd)
570 {
571 char cmdp = param_getchar(Cmd, 0);
572 if (cmdp == 'h' || cmdp == 'H')
573 return usage_data_autocorr();
574 int window = 4000; //set default
575 char grph=0;
576 bool updateGrph = false;
577 sscanf(Cmd, "%i %c", &window, &grph);
578
579 if (window >= GraphTraceLen) {
580 PrintAndLog("window must be smaller than trace (%d samples)",
581 GraphTraceLen);
582 return 0;
583 }
584 if (grph == 'g') updateGrph=true;
585 return AutoCorrelate(GraphBuffer, GraphBuffer, GraphTraceLen, window, updateGrph, true);
586 }
587
588 int CmdBitsamples(const char *Cmd)
589 {
590 int cnt = 0;
591 uint8_t got[12288];
592
593 GetFromBigBuf(got, sizeof(got), 0 , NULL, -1, false);
594
595 for (int j = 0; j < sizeof(got); j++) {
596 for (int k = 0; k < 8; k++) {
597 if(got[j] & (1 << (7 - k))) {
598 GraphBuffer[cnt++] = 1;
599 } else {
600 GraphBuffer[cnt++] = 0;
601 }
602 }
603 }
604 GraphTraceLen = cnt;
605 RepaintGraphWindow();
606 return 0;
607 }
608
609 int CmdBuffClear(const char *Cmd)
610 {
611 UsbCommand c = {CMD_BUFF_CLEAR};
612 SendCommand(&c);
613 ClearGraph(true);
614 return 0;
615 }
616
617 int CmdDec(const char *Cmd)
618 {
619 for (int i = 0; i < (GraphTraceLen / 2); ++i)
620 GraphBuffer[i] = GraphBuffer[i * 2];
621 GraphTraceLen /= 2;
622 PrintAndLog("decimated by 2");
623 RepaintGraphWindow();
624 return 0;
625 }
626 /**
627 * Undecimate - I'd call it 'interpolate', but we'll save that
628 * name until someone does an actual interpolation command, not just
629 * blindly repeating samples
630 * @param Cmd
631 * @return
632 */
633 int CmdUndec(const char *Cmd)
634 {
635 if(param_getchar(Cmd, 0) == 'h')
636 {
637 PrintAndLog("Usage: data undec [factor]");
638 PrintAndLog("This function performs un-decimation, by repeating each sample N times");
639 PrintAndLog("Options: ");
640 PrintAndLog(" h This help");
641 PrintAndLog(" factor The number of times to repeat each sample.[default:2]");
642 PrintAndLog("Example: 'data undec 3'");
643 return 0;
644 }
645
646 uint8_t factor = param_get8ex(Cmd, 0,2, 10);
647 //We have memory, don't we?
648 int swap[MAX_GRAPH_TRACE_LEN] = { 0 };
649 uint32_t g_index = 0, s_index = 0;
650 while(g_index < GraphTraceLen && s_index + factor < MAX_GRAPH_TRACE_LEN)
651 {
652 int count = 0;
653 for(count = 0; count < factor && s_index + count < MAX_GRAPH_TRACE_LEN; count++)
654 swap[s_index+count] = GraphBuffer[g_index];
655
656 s_index += count;
657 g_index++;
658 }
659
660 memcpy(GraphBuffer, swap, s_index * sizeof(int));
661 GraphTraceLen = s_index;
662 RepaintGraphWindow();
663 return 0;
664 }
665
666 //by marshmellow
667 //shift graph zero up or down based on input + or -
668 int CmdGraphShiftZero(const char *Cmd)
669 {
670
671 int shift=0;
672 //set options from parameters entered with the command
673 sscanf(Cmd, "%i", &shift);
674 int shiftedVal=0;
675 for(int i = 0; i<GraphTraceLen; i++){
676 shiftedVal=GraphBuffer[i]+shift;
677 if (shiftedVal>127)
678 shiftedVal=127;
679 else if (shiftedVal<-127)
680 shiftedVal=-127;
681 GraphBuffer[i]= shiftedVal;
682 }
683 CmdNorm("");
684 return 0;
685 }
686
687 int AskEdgeDetect(const int *in, int *out, int len, int threshold) {
688 int Last = 0;
689 for(int i = 1; i<len; i++) {
690 if (in[i]-in[i-1] >= threshold) //large jump up
691 Last = 127;
692 else if(in[i]-in[i-1] <= -1 * threshold) //large jump down
693 Last = -127;
694 out[i-1] = Last;
695 }
696 return 0;
697 }
698
699 //by marshmellow
700 //use large jumps in read samples to identify edges of waves and then amplify that wave to max
701 //similar to dirtheshold, threshold commands
702 //takes a threshold length which is the measured length between two samples then determines an edge
703 int CmdAskEdgeDetect(const char *Cmd)
704 {
705 int thresLen = 25;
706 int ans = 0;
707 sscanf(Cmd, "%i", &thresLen);
708
709 ans = AskEdgeDetect(GraphBuffer, GraphBuffer, GraphTraceLen, thresLen);
710 RepaintGraphWindow();
711 return ans;
712 }
713
714 /* Print our clock rate */
715 // uses data from graphbuffer
716 // adjusted to take char parameter for type of modulation to find the clock - by marshmellow.
717 int CmdDetectClockRate(const char *Cmd)
718 {
719 char cmdp = param_getchar(Cmd, 0);
720 if (strlen(Cmd) > 6 || strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') {
721 PrintAndLog("Usage: data detectclock [modulation] <clock>");
722 PrintAndLog(" [modulation as char], specify the modulation type you want to detect the clock of");
723 PrintAndLog(" <clock> , specify the clock (optional - to get best start position only)");
724 PrintAndLog(" 'a' = ask, 'f' = fsk, 'n' = nrz/direct, 'p' = psk");
725 PrintAndLog("");
726 PrintAndLog(" sample: data detectclock a = detect the clock of an ask modulated wave in the GraphBuffer");
727 PrintAndLog(" data detectclock f = detect the clock of an fsk modulated wave in the GraphBuffer");
728 PrintAndLog(" data detectclock p = detect the clock of an psk modulated wave in the GraphBuffer");
729 PrintAndLog(" data detectclock n = detect the clock of an nrz/direct modulated wave in the GraphBuffer");
730 }
731 int ans=0;
732 if (cmdp == 'a'){
733 ans = GetAskClock(Cmd+1, true, false);
734 } else if (cmdp == 'f'){
735 ans = GetFskClock("", true, false);
736 } else if (cmdp == 'n'){
737 ans = GetNrzClock("", true, false);
738 } else if (cmdp == 'p'){
739 ans = GetPskClock("", true, false);
740 } else {
741 PrintAndLog ("Please specify a valid modulation to detect the clock of - see option h for help");
742 }
743 return ans;
744 }
745
746 char *GetFSKType(uint8_t fchigh, uint8_t fclow, uint8_t invert)
747 {
748 static char fType[8];
749 memset(fType, 0x00, 8);
750 char *fskType = fType;
751 if (fchigh==10 && fclow==8){
752 if (invert) //fsk2a
753 memcpy(fskType, "FSK2a", 5);
754 else //fsk2
755 memcpy(fskType, "FSK2", 4);
756 } else if (fchigh == 8 && fclow == 5) {
757 if (invert)
758 memcpy(fskType, "FSK1", 4);
759 else
760 memcpy(fskType, "FSK1a", 5);
761 } else {
762 memcpy(fskType, "FSK??", 5);
763 }
764 return fskType;
765 }
766
767 //by marshmellow
768 //fsk raw demod and print binary
769 //takes 4 arguments - Clock, invert, fchigh, fclow
770 //defaults: clock = 50, invert=1, fchigh=10, fclow=8 (RF/10 RF/8 (fsk2a))
771 int FSKrawDemod(const char *Cmd, bool verbose)
772 {
773 //raw fsk demod no manchester decoding no start bit finding just get binary from wave
774 uint8_t rfLen, invert, fchigh, fclow;
775 //set defaults
776 //set options from parameters entered with the command
777 rfLen = param_get8(Cmd, 0);
778 invert = param_get8(Cmd, 1);
779 fchigh = param_get8(Cmd, 2);
780 fclow = param_get8(Cmd, 3);
781
782 if (strlen(Cmd)>0 && strlen(Cmd)<=2) {
783 if (rfLen==1) {
784 invert = 1; //if invert option only is used
785 rfLen = 0;
786 }
787 }
788 uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
789 size_t BitLen = getFromGraphBuf(BitStream);
790 if (BitLen==0) return 0;
791 //get field clock lengths
792 uint16_t fcs=0;
793 if (!fchigh || !fclow) {
794 fcs = countFC(BitStream, BitLen, 1);
795 if (!fcs) {
796 fchigh = 10;
797 fclow = 8;
798 } else {
799 fchigh = (fcs >> 8) & 0x00FF;
800 fclow = fcs & 0x00FF;
801 }
802 }
803 //get bit clock length
804 if (!rfLen) {
805 int firstClockEdge = 0; //todo - align grid on graph with this...
806 rfLen = detectFSKClk(BitStream, BitLen, fchigh, fclow, &firstClockEdge);
807 if (!rfLen) rfLen = 50;
808 }
809 int startIdx = 0;
810 int size = fskdemod(BitStream, BitLen, rfLen, invert, fchigh, fclow, &startIdx);
811 if (size > 0) {
812 setDemodBuf(BitStream,size,0);
813 setClockGrid(rfLen, startIdx);
814
815 // Now output the bitstream to the scrollback by line of 16 bits
816 if (verbose || g_debugMode) {
817 PrintAndLog("\nUsing Clock:%u, invert:%u, fchigh:%u, fclow:%u", (unsigned int)rfLen, (unsigned int)invert, (unsigned int)fchigh, (unsigned int)fclow);
818 PrintAndLog("%s decoded bitstream:",GetFSKType(fchigh,fclow,invert));
819 printDemodBuff();
820 }
821
822 return 1;
823 } else {
824 if (g_debugMode) PrintAndLog("no FSK data found");
825 }
826 return 0;
827 }
828
829 //by marshmellow
830 //fsk raw demod and print binary
831 //takes 4 arguments - Clock, invert, fchigh, fclow
832 //defaults: clock = 50, invert=1, fchigh=10, fclow=8 (RF/10 RF/8 (fsk2a))
833 int CmdFSKrawdemod(const char *Cmd)
834 {
835 char cmdp = param_getchar(Cmd, 0);
836 if (strlen(Cmd) > 20 || cmdp == 'h' || cmdp == 'H') {
837 PrintAndLog("Usage: data rawdemod fs [clock] <invert> [fchigh] [fclow]");
838 PrintAndLog(" [set clock as integer] optional, omit for autodetect.");
839 PrintAndLog(" <invert>, 1 for invert output, can be used even if the clock is omitted");
840 PrintAndLog(" [fchigh], larger field clock length, omit for autodetect");
841 PrintAndLog(" [fclow], small field clock length, omit for autodetect");
842 PrintAndLog("");
843 PrintAndLog(" sample: data rawdemod fs = demod an fsk tag from GraphBuffer using autodetect");
844 PrintAndLog(" : data rawdemod fs 32 = demod an fsk tag from GraphBuffer using a clock of RF/32, autodetect fc");
845 PrintAndLog(" : data rawdemod fs 1 = demod an fsk tag from GraphBuffer using autodetect, invert output");
846 PrintAndLog(" : data rawdemod fs 32 1 = demod an fsk tag from GraphBuffer using a clock of RF/32, invert output, autodetect fc");
847 PrintAndLog(" : data rawdemod fs 64 0 8 5 = demod an fsk1 RF/64 tag from GraphBuffer");
848 PrintAndLog(" : data rawdemod fs 50 0 10 8 = demod an fsk2 RF/50 tag from GraphBuffer");
849 PrintAndLog(" : data rawdemod fs 50 1 10 8 = demod an fsk2a RF/50 tag from GraphBuffer");
850 return 0;
851 }
852 return FSKrawDemod(Cmd, true);
853 }
854
855 //by marshmellow
856 //attempt to psk1 demod graph buffer
857 int PSKDemod(const char *Cmd, bool verbose)
858 {
859 int invert=0;
860 int clk=0;
861 int maxErr=100;
862 sscanf(Cmd, "%i %i %i", &clk, &invert, &maxErr);
863 if (clk==1){
864 invert=1;
865 clk=0;
866 }
867 if (invert != 0 && invert != 1) {
868 if (g_debugMode || verbose) PrintAndLog("Invalid argument: %s", Cmd);
869 return 0;
870 }
871 uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
872 size_t BitLen = getFromGraphBuf(BitStream);
873 if (BitLen==0) return 0;
874 int errCnt=0;
875 int startIdx = 0;
876 errCnt = pskRawDemod_ext(BitStream, &BitLen, &clk, &invert, &startIdx);
877 if (errCnt > maxErr){
878 if (g_debugMode || verbose) PrintAndLog("Too many errors found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
879 return 0;
880 }
881 if (errCnt<0|| BitLen<16){ //throw away static - allow 1 and -1 (in case of threshold command first)
882 if (g_debugMode || verbose) PrintAndLog("no data found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
883 return 0;
884 }
885 if (verbose || g_debugMode){
886 PrintAndLog("\nUsing Clock:%d, invert:%d, Bits Found:%d",clk,invert,BitLen);
887 if (errCnt>0){
888 PrintAndLog("# Errors during Demoding (shown as 7 in bit stream): %d",errCnt);
889 }
890 }
891 //prime demod buffer for output
892 setDemodBuf(BitStream,BitLen,0);
893 setClockGrid(clk, startIdx);
894
895 return 1;
896 }
897
898 // by marshmellow
899 // takes 3 arguments - clock, invert, maxErr as integers
900 // attempts to demodulate nrz only
901 // prints binary found and saves in demodbuffer for further commands
902 int NRZrawDemod(const char *Cmd, bool verbose)
903 {
904 int invert=0;
905 int clk=0;
906 int maxErr=100;
907 sscanf(Cmd, "%i %i %i", &clk, &invert, &maxErr);
908 if (clk==1){
909 invert=1;
910 clk=0;
911 }
912 if (invert != 0 && invert != 1) {
913 PrintAndLog("Invalid argument: %s", Cmd);
914 return 0;
915 }
916 uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
917 size_t BitLen = getFromGraphBuf(BitStream);
918 if (BitLen==0) return 0;
919 int errCnt=0;
920 int clkStartIdx = 0;
921 errCnt = nrzRawDemod(BitStream, &BitLen, &clk, &invert, &clkStartIdx);
922 if (errCnt > maxErr){
923 if (g_debugMode) PrintAndLog("Too many errors found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
924 return 0;
925 }
926 if (errCnt<0 || BitLen<16){ //throw away static - allow 1 and -1 (in case of threshold command first)
927 if (g_debugMode) PrintAndLog("no data found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
928 return 0;
929 }
930 if (verbose || g_debugMode) PrintAndLog("Tried NRZ Demod using Clock: %d - invert: %d - Bits Found: %d",clk,invert,BitLen);
931 //prime demod buffer for output
932 setDemodBuf(BitStream,BitLen,0);
933 setClockGrid(clk, clkStartIdx);
934
935
936 if (errCnt>0 && (verbose || g_debugMode)) PrintAndLog("# Errors during Demoding (shown as 7 in bit stream): %d",errCnt);
937 if (verbose || g_debugMode) {
938 PrintAndLog("NRZ demoded bitstream:");
939 // Now output the bitstream to the scrollback by line of 16 bits
940 printDemodBuff();
941 }
942 return 1;
943 }
944
945 int CmdNRZrawDemod(const char *Cmd)
946 {
947 char cmdp = param_getchar(Cmd, 0);
948 if (strlen(Cmd) > 16 || cmdp == 'h' || cmdp == 'H') {
949 PrintAndLog("Usage: data rawdemod nr [clock] <0|1> [maxError]");
950 PrintAndLog(" [set clock as integer] optional, if not set, autodetect.");
951 PrintAndLog(" <invert>, 1 for invert output");
952 PrintAndLog(" [set maximum allowed errors], default = 100.");
953 PrintAndLog("");
954 PrintAndLog(" sample: data rawdemod nr = demod a nrz/direct tag from GraphBuffer");
955 PrintAndLog(" : data rawdemod nr 32 = demod a nrz/direct tag from GraphBuffer using a clock of RF/32");
956 PrintAndLog(" : data rawdemod nr 32 1 = demod a nrz/direct tag from GraphBuffer using a clock of RF/32 and inverting data");
957 PrintAndLog(" : data rawdemod nr 1 = demod a nrz/direct tag from GraphBuffer while inverting data");
958 PrintAndLog(" : data rawdemod nr 64 1 0 = demod a nrz/direct tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
959 return 0;
960 }
961 return NRZrawDemod(Cmd, true);
962 }
963
964 // by marshmellow
965 // takes 3 arguments - clock, invert, maxErr as integers
966 // attempts to demodulate psk only
967 // prints binary found and saves in demodbuffer for further commands
968 int CmdPSK1rawDemod(const char *Cmd)
969 {
970 int ans;
971 char cmdp = param_getchar(Cmd, 0);
972 if (strlen(Cmd) > 16 || cmdp == 'h' || cmdp == 'H') {
973 PrintAndLog("Usage: data rawdemod p1 [clock] <0|1> [maxError]");
974 PrintAndLog(" [set clock as integer] optional, if not set, autodetect.");
975 PrintAndLog(" <invert>, 1 for invert output");
976 PrintAndLog(" [set maximum allowed errors], default = 100.");
977 PrintAndLog("");
978 PrintAndLog(" sample: data rawdemod p1 = demod a psk1 tag from GraphBuffer");
979 PrintAndLog(" : data rawdemod p1 32 = demod a psk1 tag from GraphBuffer using a clock of RF/32");
980 PrintAndLog(" : data rawdemod p1 32 1 = demod a psk1 tag from GraphBuffer using a clock of RF/32 and inverting data");
981 PrintAndLog(" : data rawdemod p1 1 = demod a psk1 tag from GraphBuffer while inverting data");
982 PrintAndLog(" : data rawdemod p1 64 1 0 = demod a psk1 tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
983 return 0;
984 }
985 ans = PSKDemod(Cmd, true);
986 //output
987 if (!ans){
988 if (g_debugMode) PrintAndLog("Error demoding: %d",ans);
989 return 0;
990 }
991
992 PrintAndLog("PSK1 demoded bitstream:");
993 // Now output the bitstream to the scrollback by line of 16 bits
994 printDemodBuff();
995 return 1;
996 }
997
998 // by marshmellow
999 // takes same args as cmdpsk1rawdemod
1000 int CmdPSK2rawDemod(const char *Cmd)
1001 {
1002 int ans=0;
1003 char cmdp = param_getchar(Cmd, 0);
1004 if (strlen(Cmd) > 16 || cmdp == 'h' || cmdp == 'H') {
1005 PrintAndLog("Usage: data rawdemod p2 [clock] <0|1> [maxError]");
1006 PrintAndLog(" [set clock as integer] optional, if not set, autodetect.");
1007 PrintAndLog(" <invert>, 1 for invert output");
1008 PrintAndLog(" [set maximum allowed errors], default = 100.");
1009 PrintAndLog("");
1010 PrintAndLog(" sample: data rawdemod p2 = demod a psk2 tag from GraphBuffer, autodetect clock");
1011 PrintAndLog(" : data rawdemod p2 32 = demod a psk2 tag from GraphBuffer using a clock of RF/32");
1012 PrintAndLog(" : data rawdemod p2 32 1 = demod a psk2 tag from GraphBuffer using a clock of RF/32 and inverting output");
1013 PrintAndLog(" : data rawdemod p2 1 = demod a psk2 tag from GraphBuffer, autodetect clock and invert output");
1014 PrintAndLog(" : data rawdemod p2 64 1 0 = demod a psk2 tag from GraphBuffer using a clock of RF/64, inverting output and allowing 0 demod errors");
1015 return 0;
1016 }
1017 ans=PSKDemod(Cmd, true);
1018 if (!ans){
1019 if (g_debugMode) PrintAndLog("Error demoding: %d",ans);
1020 return 0;
1021 }
1022 psk1TOpsk2(DemodBuffer, DemodBufferLen);
1023 PrintAndLog("PSK2 demoded bitstream:");
1024 // Now output the bitstream to the scrollback by line of 16 bits
1025 printDemodBuff();
1026 return 1;
1027 }
1028
1029 // by marshmellow - combines all raw demod functions into one menu command
1030 int CmdRawDemod(const char *Cmd)
1031 {
1032 char cmdp = Cmd[0]; //param_getchar(Cmd, 0);
1033
1034 if (strlen(Cmd) > 35 || cmdp == 'h' || cmdp == 'H' || strlen(Cmd)<2) {
1035 PrintAndLog("Usage: data rawdemod [modulation] <help>|<options>");
1036 PrintAndLog(" [modulation] as 2 char, 'ab' for ask/biphase, 'am' for ask/manchester, 'ar' for ask/raw, 'fs' for fsk, ...");
1037 PrintAndLog(" 'nr' for nrz/direct, 'p1' for psk1, 'p2' for psk2");
1038 PrintAndLog(" <help> as 'h', prints the help for the specific modulation");
1039 PrintAndLog(" <options> see specific modulation help for optional parameters");
1040 PrintAndLog("");
1041 PrintAndLog(" sample: data rawdemod fs h = print help specific to fsk demod");
1042 PrintAndLog(" : data rawdemod fs = demod GraphBuffer using: fsk - autodetect");
1043 PrintAndLog(" : data rawdemod ab = demod GraphBuffer using: ask/biphase - autodetect");
1044 PrintAndLog(" : data rawdemod am = demod GraphBuffer using: ask/manchester - autodetect");
1045 PrintAndLog(" : data rawdemod ar = demod GraphBuffer using: ask/raw - autodetect");
1046 PrintAndLog(" : data rawdemod nr = demod GraphBuffer using: nrz/direct - autodetect");
1047 PrintAndLog(" : data rawdemod p1 = demod GraphBuffer using: psk1 - autodetect");
1048 PrintAndLog(" : data rawdemod p2 = demod GraphBuffer using: psk2 - autodetect");
1049 return 0;
1050 }
1051 char cmdp2 = Cmd[1];
1052 int ans = 0;
1053 if (cmdp == 'f' && cmdp2 == 's'){
1054 ans = CmdFSKrawdemod(Cmd+2);
1055 } else if(cmdp == 'a' && cmdp2 == 'b'){
1056 ans = Cmdaskbiphdemod(Cmd+2);
1057 } else if(cmdp == 'a' && cmdp2 == 'm'){
1058 ans = Cmdaskmandemod(Cmd+2);
1059 } else if(cmdp == 'a' && cmdp2 == 'r'){
1060 ans = Cmdaskrawdemod(Cmd+2);
1061 } else if(cmdp == 'n' && cmdp2 == 'r'){
1062 ans = CmdNRZrawDemod(Cmd+2);
1063 } else if(cmdp == 'p' && cmdp2 == '1'){
1064 ans = CmdPSK1rawDemod(Cmd+2);
1065 } else if(cmdp == 'p' && cmdp2 == '2'){
1066 ans = CmdPSK2rawDemod(Cmd+2);
1067 } else {
1068 PrintAndLog("unknown modulation entered - see help ('h') for parameter structure");
1069 }
1070 return ans;
1071 }
1072
1073 void setClockGrid(int clk, int offset) {
1074 g_DemodStartIdx = offset;
1075 g_DemodClock = clk;
1076 if (g_debugMode) PrintAndLog("demodoffset %d, clk %d",offset,clk);
1077
1078 if (offset > clk) offset %= clk;
1079 if (offset < 0) offset += clk;
1080
1081 if (offset > GraphTraceLen || offset < 0) return;
1082 if (clk < 8 || clk > GraphTraceLen) {
1083 GridLocked = false;
1084 GridOffset = 0;
1085 PlotGridX = 0;
1086 PlotGridXdefault = 0;
1087 RepaintGraphWindow();
1088 } else {
1089 GridLocked = true;
1090 GridOffset = offset;
1091 PlotGridX = clk;
1092 PlotGridXdefault = clk;
1093 RepaintGraphWindow();
1094 }
1095 }
1096
1097 int CmdGrid(const char *Cmd)
1098 {
1099 sscanf(Cmd, "%i %i", &PlotGridX, &PlotGridY);
1100 PlotGridXdefault= PlotGridX;
1101 PlotGridYdefault= PlotGridY;
1102 RepaintGraphWindow();
1103 return 0;
1104 }
1105
1106 int CmdSetGraphMarkers(const char *Cmd) {
1107 sscanf(Cmd, "%i %i", &CursorCPos, &CursorDPos);
1108 RepaintGraphWindow();
1109 return 0;
1110 }
1111
1112 int CmdHexsamples(const char *Cmd)
1113 {
1114 int i, j;
1115 int requested = 0;
1116 int offset = 0;
1117 char string_buf[25];
1118 char* string_ptr = string_buf;
1119 uint8_t got[BIGBUF_SIZE];
1120
1121 sscanf(Cmd, "%i %i", &requested, &offset);
1122
1123 /* if no args send something */
1124 if (requested == 0) {
1125 requested = 8;
1126 }
1127 if (offset + requested > sizeof(got)) {
1128 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > %d", BIGBUF_SIZE);
1129 return 0;
1130 }
1131
1132 GetFromBigBuf(got, requested, offset, NULL, -1, false);
1133
1134 i = 0;
1135 for (j = 0; j < requested; j++) {
1136 i++;
1137 string_ptr += sprintf(string_ptr, "%02x ", got[j]);
1138 if (i == 8) {
1139 *(string_ptr - 1) = '\0'; // remove the trailing space
1140 PrintAndLog("%s", string_buf);
1141 string_buf[0] = '\0';
1142 string_ptr = string_buf;
1143 i = 0;
1144 }
1145 if (j == requested - 1 && string_buf[0] != '\0') { // print any remaining bytes
1146 *(string_ptr - 1) = '\0';
1147 PrintAndLog("%s", string_buf);
1148 string_buf[0] = '\0';
1149 }
1150 }
1151 return 0;
1152 }
1153
1154 int CmdHide(const char *Cmd)
1155 {
1156 HideGraphWindow();
1157 return 0;
1158 }
1159
1160 //zero mean GraphBuffer
1161 int CmdHpf(const char *Cmd)
1162 {
1163 int i;
1164 int accum = 0;
1165
1166 for (i = 10; i < GraphTraceLen; ++i)
1167 accum += GraphBuffer[i];
1168 accum /= (GraphTraceLen - 10);
1169 for (i = 0; i < GraphTraceLen; ++i)
1170 GraphBuffer[i] -= accum;
1171
1172 RepaintGraphWindow();
1173 return 0;
1174 }
1175
1176 uint8_t getByte(uint8_t bits_per_sample, BitstreamIn* b)
1177 {
1178 int i;
1179 uint8_t val = 0;
1180 for(i =0 ; i < bits_per_sample; i++)
1181 {
1182 val |= (headBit(b) << (7-i));
1183 }
1184 return val;
1185 }
1186
1187 int getSamples(int n, bool silent)
1188 {
1189 //If we get all but the last byte in bigbuf,
1190 // we don't have to worry about remaining trash
1191 // in the last byte in case the bits-per-sample
1192 // does not line up on byte boundaries
1193
1194 uint8_t got[BIGBUF_SIZE-1] = { 0 };
1195
1196 if (n == 0 || n > sizeof(got))
1197 n = sizeof(got);
1198
1199 if (!silent) PrintAndLog("Reading %d bytes from device memory\n", n);
1200 UsbCommand response;
1201 GetFromBigBuf(got, n, 0, &response, -1, false);
1202 if (!silent) PrintAndLog("Data fetched");
1203 uint8_t bits_per_sample = 8;
1204
1205 //Old devices without this feature would send 0 at arg[0]
1206 if(response.arg[0] > 0)
1207 {
1208 sample_config *sc = (sample_config *) response.d.asBytes;
1209 if (!silent) PrintAndLog("Samples @ %d bits/smpl, decimation 1:%d ", sc->bits_per_sample
1210 , sc->decimation);
1211 bits_per_sample = sc->bits_per_sample;
1212 }
1213 if(bits_per_sample < 8)
1214 {
1215 if (!silent) PrintAndLog("Unpacking...");
1216 BitstreamIn bout = { got, bits_per_sample * n, 0};
1217 int j =0;
1218 for (j = 0; j * bits_per_sample < n * 8 && j < n; j++) {
1219 uint8_t sample = getByte(bits_per_sample, &bout);
1220 GraphBuffer[j] = ((int) sample )- 128;
1221 }
1222 GraphTraceLen = j;
1223 PrintAndLog("Unpacked %d samples" , j );
1224 }else
1225 {
1226 for (int j = 0; j < n; j++) {
1227 GraphBuffer[j] = ((int)got[j]) - 128;
1228 }
1229 GraphTraceLen = n;
1230 }
1231
1232 setClockGrid(0,0);
1233 DemodBufferLen = 0;
1234 RepaintGraphWindow();
1235 return 0;
1236 }
1237
1238 int CmdSamples(const char *Cmd)
1239 {
1240 int n = strtol(Cmd, NULL, 0);
1241 return getSamples(n, false);
1242 }
1243
1244 int CmdTuneSamples(const char *Cmd)
1245 {
1246 int timeout = 0, arg = FLAG_TUNE_ALL;
1247
1248 if(*Cmd == 'l') {
1249 arg = FLAG_TUNE_LF;
1250 } else if (*Cmd == 'h') {
1251 arg = FLAG_TUNE_HF;
1252 } else if (*Cmd != '\0') {
1253 PrintAndLog("use 'tune' or 'tune l' or 'tune h'");
1254 return 0;
1255 }
1256
1257 printf("\nMeasuring antenna characteristics, please wait...");
1258
1259 UsbCommand c = {CMD_MEASURE_ANTENNA_TUNING, {arg, 0, 0}};
1260 SendCommand(&c);
1261
1262 UsbCommand resp;
1263 while(!WaitForResponseTimeout(CMD_MEASURED_ANTENNA_TUNING,&resp,1000)) {
1264 timeout++;
1265 printf(".");
1266 if (timeout > 7) {
1267 PrintAndLog("\nNo response from Proxmark. Aborting...");
1268 return 1;
1269 }
1270 }
1271
1272 int peakv, peakf;
1273 int vLf125, vLf134, vHf;
1274 vLf125 = resp.arg[0] & 0xffff;
1275 vLf134 = resp.arg[0] >> 16;
1276 vHf = resp.arg[1] & 0xffff;;
1277 peakf = resp.arg[2] & 0xffff;
1278 peakv = resp.arg[2] >> 16;
1279 PrintAndLog("");
1280 if (arg & FLAG_TUNE_LF)
1281 {
1282 PrintAndLog("# LF antenna: %5.2f V @ 125.00 kHz", vLf125/500.0);
1283 PrintAndLog("# LF antenna: %5.2f V @ 134.00 kHz", vLf134/500.0);
1284 PrintAndLog("# LF optimal: %5.2f V @%9.2f kHz", peakv/500.0, 12000.0/(peakf+1));
1285 }
1286 if (arg & FLAG_TUNE_HF)
1287 PrintAndLog("# HF antenna: %5.2f V @ 13.56 MHz", vHf/1000.0);
1288
1289 #define LF_UNUSABLE_V 3000
1290 #define LF_MARGINAL_V 15000
1291 #define HF_UNUSABLE_V 3200
1292 #define HF_MARGINAL_V 8000
1293
1294 if (arg & FLAG_TUNE_LF)
1295 {
1296 if (peakv<<1 < LF_UNUSABLE_V)
1297 PrintAndLog("# Your LF antenna is unusable.");
1298 else if (peakv<<1 < LF_MARGINAL_V)
1299 PrintAndLog("# Your LF antenna is marginal.");
1300 }
1301 if (arg & FLAG_TUNE_HF)
1302 {
1303 if (vHf < HF_UNUSABLE_V)
1304 PrintAndLog("# Your HF antenna is unusable.");
1305 else if (vHf < HF_MARGINAL_V)
1306 PrintAndLog("# Your HF antenna is marginal.");
1307 }
1308
1309 if (peakv<<1 >= LF_UNUSABLE_V) {
1310 for (int i = 0; i < 256; i++) {
1311 GraphBuffer[i] = resp.d.asBytes[i] - 128;
1312 }
1313 PrintAndLog("Displaying LF tuning graph. Divisor 89 is 134khz, 95 is 125khz.\n");
1314 PrintAndLog("\n");
1315 GraphTraceLen = 256;
1316 ShowGraphWindow();
1317 RepaintGraphWindow();
1318 }
1319
1320 return 0;
1321 }
1322
1323
1324 int CmdLoad(const char *Cmd)
1325 {
1326 char filename[FILE_PATH_SIZE] = {0x00};
1327 int len = 0;
1328
1329 len = strlen(Cmd);
1330 if (len > FILE_PATH_SIZE) len = FILE_PATH_SIZE;
1331 memcpy(filename, Cmd, len);
1332
1333 FILE *f = fopen(filename, "r");
1334 if (!f) {
1335 PrintAndLog("couldn't open '%s'", filename);
1336 return 0;
1337 }
1338
1339 GraphTraceLen = 0;
1340 char line[80];
1341 while (fgets(line, sizeof (line), f)) {
1342 GraphBuffer[GraphTraceLen] = atoi(line);
1343 GraphTraceLen++;
1344 }
1345 fclose(f);
1346 PrintAndLog("loaded %d samples", GraphTraceLen);
1347 setClockGrid(0,0);
1348 DemodBufferLen = 0;
1349 RepaintGraphWindow();
1350 return 0;
1351 }
1352
1353 int CmdLtrim(const char *Cmd)
1354 {
1355 int ds = atoi(Cmd);
1356 if (GraphTraceLen<=0) return 0;
1357 for (int i = ds; i < GraphTraceLen; ++i)
1358 GraphBuffer[i-ds] = GraphBuffer[i];
1359 GraphTraceLen -= ds;
1360
1361 RepaintGraphWindow();
1362 return 0;
1363 }
1364
1365 // trim graph to input argument length
1366 int CmdRtrim(const char *Cmd)
1367 {
1368 int ds = atoi(Cmd);
1369
1370 GraphTraceLen = ds;
1371
1372 RepaintGraphWindow();
1373 return 0;
1374 }
1375
1376 // trim graph (middle) piece
1377 int CmdMtrim(const char *Cmd) {
1378 int start = 0, stop = 0;
1379 sscanf(Cmd, "%i %i", &start, &stop);
1380
1381 if (start > GraphTraceLen || stop > GraphTraceLen || start > stop) return 0;
1382 start++; //leave start position sample
1383
1384 GraphTraceLen = stop - start;
1385 for (int i = 0; i < GraphTraceLen; i++) {
1386 GraphBuffer[i] = GraphBuffer[start+i];
1387 }
1388 return 0;
1389 }
1390
1391
1392 int CmdNorm(const char *Cmd)
1393 {
1394 int i;
1395 int max = INT_MIN, min = INT_MAX;
1396
1397 for (i = 10; i < GraphTraceLen; ++i) {
1398 if (GraphBuffer[i] > max)
1399 max = GraphBuffer[i];
1400 if (GraphBuffer[i] < min)
1401 min = GraphBuffer[i];
1402 }
1403
1404 if (max != min) {
1405 for (i = 0; i < GraphTraceLen; ++i) {
1406 GraphBuffer[i] = ((long)(GraphBuffer[i] - ((max + min) / 2)) * 256) / (max - min);
1407 //marshmelow: adjusted *1000 to *256 to make +/- 128 so demod commands still work
1408 }
1409 }
1410 RepaintGraphWindow();
1411 return 0;
1412 }
1413
1414 int CmdPlot(const char *Cmd)
1415 {
1416 ShowGraphWindow();
1417 return 0;
1418 }
1419
1420 int CmdSave(const char *Cmd)
1421 {
1422 char filename[FILE_PATH_SIZE] = {0x00};
1423 int len = 0;
1424
1425 len = strlen(Cmd);
1426 if (len > FILE_PATH_SIZE) len = FILE_PATH_SIZE;
1427 memcpy(filename, Cmd, len);
1428
1429
1430 FILE *f = fopen(filename, "w");
1431 if(!f) {
1432 PrintAndLog("couldn't open '%s'", filename);
1433 return 0;
1434 }
1435 int i;
1436 for (i = 0; i < GraphTraceLen; i++) {
1437 fprintf(f, "%d\n", GraphBuffer[i]);
1438 }
1439 fclose(f);
1440 PrintAndLog("saved to '%s'", Cmd);
1441 return 0;
1442 }
1443
1444 int CmdScale(const char *Cmd)
1445 {
1446 CursorScaleFactor = atoi(Cmd);
1447 if (CursorScaleFactor == 0) {
1448 PrintAndLog("bad, can't have zero scale");
1449 CursorScaleFactor = 1;
1450 }
1451 RepaintGraphWindow();
1452 return 0;
1453 }
1454
1455 int directionalThreshold(const int* in, int *out, size_t len, int8_t up, int8_t down)
1456 {
1457 int lastValue = in[0];
1458 out[0] = 0; // Will be changed at the end, but init 0 as we adjust to last samples value if no threshold kicks in.
1459
1460 for (int i = 1; i < len; ++i) {
1461 // Apply first threshold to samples heading up
1462 if (in[i] >= up && in[i] > lastValue)
1463 {
1464 lastValue = out[i]; // Buffer last value as we overwrite it.
1465 out[i] = 1;
1466 }
1467 // Apply second threshold to samples heading down
1468 else if (in[i] <= down && in[i] < lastValue)
1469 {
1470 lastValue = out[i]; // Buffer last value as we overwrite it.
1471 out[i] = -1;
1472 }
1473 else
1474 {
1475 lastValue = out[i]; // Buffer last value as we overwrite it.
1476 out[i] = out[i-1];
1477 }
1478 }
1479 out[0] = out[1]; // Align with first edited sample.
1480 return 0;
1481 }
1482
1483 int CmdDirectionalThreshold(const char *Cmd)
1484 {
1485 int8_t upThres = param_get8(Cmd, 0);
1486 int8_t downThres = param_get8(Cmd, 1);
1487
1488 printf("Applying Up Threshold: %d, Down Threshold: %d\n", upThres, downThres);
1489
1490 directionalThreshold(GraphBuffer, GraphBuffer,GraphTraceLen, upThres, downThres);
1491 RepaintGraphWindow();
1492 return 0;
1493 }
1494
1495 int CmdZerocrossings(const char *Cmd)
1496 {
1497 // Zero-crossings aren't meaningful unless the signal is zero-mean.
1498 CmdHpf("");
1499
1500 int sign = 1;
1501 int zc = 0;
1502 int lastZc = 0;
1503
1504 for (int i = 0; i < GraphTraceLen; ++i) {
1505 if (GraphBuffer[i] * sign >= 0) {
1506 // No change in sign, reproduce the previous sample count.
1507 zc++;
1508 GraphBuffer[i] = lastZc;
1509 } else {
1510 // Change in sign, reset the sample count.
1511 sign = -sign;
1512 GraphBuffer[i] = lastZc;
1513 if (sign > 0) {
1514 lastZc = zc;
1515 zc = 0;
1516 }
1517 }
1518 }
1519
1520 RepaintGraphWindow();
1521 return 0;
1522 }
1523
1524 int usage_data_bin2hex(){
1525 PrintAndLog("Usage: data bin2hex <binary_digits>");
1526 PrintAndLog(" This function will ignore all characters not 1 or 0 (but stop reading on whitespace)");
1527 return 0;
1528 }
1529
1530 /**
1531 * @brief Utility for conversion via cmdline.
1532 * @param Cmd
1533 * @return
1534 */
1535 int Cmdbin2hex(const char *Cmd)
1536 {
1537 int bg =0, en =0;
1538 if(param_getptr(Cmd, &bg, &en, 0))
1539 {
1540 return usage_data_bin2hex();
1541 }
1542 //Number of digits supplied as argument
1543 size_t length = en - bg +1;
1544 size_t bytelen = (length+7) / 8;
1545 uint8_t* arr = (uint8_t *) malloc(bytelen);
1546 memset(arr, 0, bytelen);
1547 BitstreamOut bout = { arr, 0, 0 };
1548
1549 for(; bg <= en ;bg++)
1550 {
1551 char c = Cmd[bg];
1552 if( c == '1') pushBit(&bout, 1);
1553 else if( c == '0') pushBit(&bout, 0);
1554 else PrintAndLog("Ignoring '%c'", c);
1555 }
1556
1557 if(bout.numbits % 8 != 0)
1558 {
1559 printf("[padded with %d zeroes]\n", 8-(bout.numbits % 8));
1560 }
1561
1562 //Uses printf instead of PrintAndLog since the latter
1563 // adds linebreaks to each printout - this way was more convenient since we don't have to
1564 // allocate a string and write to that first...
1565 for(size_t x = 0; x < bytelen ; x++)
1566 {
1567 printf("%02X", arr[x]);
1568 }
1569 printf("\n");
1570 free(arr);
1571 return 0;
1572 }
1573
1574 int usage_data_hex2bin() {
1575 PrintAndLog("Usage: data hex2bin <hex_digits>");
1576 PrintAndLog(" This function will ignore all non-hexadecimal characters (but stop reading on whitespace)");
1577 return 0;
1578
1579 }
1580
1581 int Cmdhex2bin(const char *Cmd)
1582 {
1583 int bg =0, en =0;
1584 if(param_getptr(Cmd, &bg, &en, 0))
1585 {
1586 return usage_data_hex2bin();
1587 }
1588
1589
1590 while(bg <= en )
1591 {
1592 char x = Cmd[bg++];
1593 // capitalize
1594 if (x >= 'a' && x <= 'f')
1595 x -= 32;
1596 // convert to numeric value
1597 if (x >= '0' && x <= '9')
1598 x -= '0';
1599 else if (x >= 'A' && x <= 'F')
1600 x -= 'A' - 10;
1601 else
1602 continue;
1603
1604 //Uses printf instead of PrintAndLog since the latter
1605 // adds linebreaks to each printout - this way was more convenient since we don't have to
1606 // allocate a string and write to that first...
1607
1608 for(int i= 0 ; i < 4 ; ++i)
1609 printf("%d",(x >> (3 - i)) & 1);
1610 }
1611 printf("\n");
1612
1613 return 0;
1614 }
1615
1616 /* // example of FSK2 RF/50 Tones
1617 static const int LowTone[] = {
1618 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
1619 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
1620 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
1621 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
1622 1, 1, 1, 1, 1, -1, -1, -1, -1, -1
1623 };
1624 static const int HighTone[] = {
1625 1, 1, 1, 1, 1, -1, -1, -1, -1, // note one extra 1 to padd due to 50/8 remainder (1/2 the remainder)
1626 1, 1, 1, 1, -1, -1, -1, -1,
1627 1, 1, 1, 1, -1, -1, -1, -1,
1628 1, 1, 1, 1, -1, -1, -1, -1,
1629 1, 1, 1, 1, -1, -1, -1, -1,
1630 1, 1, 1, 1, -1, -1, -1, -1, -1, // note one extra -1 to padd due to 50/8 remainder
1631 };
1632 */
1633 void GetHiLoTone(int *LowTone, int *HighTone, int clk, int LowToneFC, int HighToneFC) {
1634 int i,j=0;
1635 int Left_Modifier = ((clk % LowToneFC) % 2) + ((clk % LowToneFC)/2);
1636 int Right_Modifier = (clk % LowToneFC) / 2;
1637 //int HighToneMod = clk mod HighToneFC;
1638 int LeftHalfFCCnt = (LowToneFC % 2) + (LowToneFC/2); //truncate
1639 int FCs_per_clk = clk/LowToneFC;
1640
1641 // need to correctly split up the clock to field clocks.
1642 // First attempt uses modifiers on each end to make up for when FCs don't evenly divide into Clk
1643
1644 // start with LowTone
1645 // set extra 1 modifiers to make up for when FC doesn't divide evenly into Clk
1646 for (i = 0; i < Left_Modifier; i++) {
1647 LowTone[i] = 1;
1648 }
1649
1650 // loop # of field clocks inside the main clock
1651 for (i = 0; i < (FCs_per_clk); i++) {
1652 // loop # of samples per field clock
1653 for (j = 0; j < LowToneFC; j++) {
1654 LowTone[(i*LowToneFC)+Left_Modifier+j] = ( j < LeftHalfFCCnt ) ? 1 : -1;
1655 }
1656 }
1657
1658 int k;
1659 // add last -1 modifiers
1660 for (k = 0; k < Right_Modifier; k++) {
1661 LowTone[((i-1)*LowToneFC)+Left_Modifier+j+k] = -1;
1662 }
1663
1664 // now do hightone
1665 Left_Modifier = ((clk % HighToneFC) % 2) + ((clk % HighToneFC)/2);
1666 Right_Modifier = (clk % HighToneFC) / 2;
1667 LeftHalfFCCnt = (HighToneFC % 2) + (HighToneFC/2); //truncate
1668 FCs_per_clk = clk/HighToneFC;
1669
1670 for (i = 0; i < Left_Modifier; i++) {
1671 HighTone[i] = 1;
1672 }
1673
1674 // loop # of field clocks inside the main clock
1675 for (i = 0; i < (FCs_per_clk); i++) {
1676 // loop # of samples per field clock
1677 for (j = 0; j < HighToneFC; j++) {
1678 HighTone[(i*HighToneFC)+Left_Modifier+j] = ( j < LeftHalfFCCnt ) ? 1 : -1;
1679 }
1680 }
1681
1682 // add last -1 modifiers
1683 for (k = 0; k < Right_Modifier; k++) {
1684 PrintAndLog("(i-1)*HighToneFC+lm+j+k %i",((i-1)*HighToneFC)+Left_Modifier+j+k);
1685 HighTone[((i-1)*HighToneFC)+Left_Modifier+j+k] = -1;
1686 }
1687 if (g_debugMode == 2) {
1688 for ( i = 0; i < clk; i++) {
1689 PrintAndLog("Low: %i, High: %i",LowTone[i],HighTone[i]);
1690 }
1691 }
1692 }
1693
1694 //old CmdFSKdemod adapted by marshmellow
1695 //converts FSK to clear NRZ style wave. (or demodulates)
1696 int FSKToNRZ(int *data, int *dataLen, int clk, int LowToneFC, int HighToneFC) {
1697 uint8_t ans=0;
1698 if (clk == 0 || LowToneFC == 0 || HighToneFC == 0) {
1699 int firstClockEdge=0;
1700 ans = fskClocks((uint8_t *) &LowToneFC, (uint8_t *) &HighToneFC, (uint8_t *) &clk, false, &firstClockEdge);
1701 if (g_debugMode > 1) {
1702 PrintAndLog ("DEBUG FSKtoNRZ: detected clocks: fc_low %i, fc_high %i, clk %i, firstClockEdge %i, ans %u", LowToneFC, HighToneFC, clk, firstClockEdge, ans);
1703 }
1704 }
1705 // currently only know fsk modulations with field clocks < 10 samples and > 4 samples. filter out to remove false positives (and possibly destroying ask/psk modulated waves...)
1706 if (ans == 0 || clk == 0 || LowToneFC == 0 || HighToneFC == 0 || LowToneFC > 10 || HighToneFC < 4) {
1707 if (g_debugMode > 1) {
1708 PrintAndLog ("DEBUG FSKtoNRZ: no fsk clocks found");
1709 }
1710 return 0;
1711 }
1712 int LowTone[clk];
1713 int HighTone[clk];
1714 GetHiLoTone(LowTone, HighTone, clk, LowToneFC, HighToneFC);
1715
1716 int i, j;
1717
1718 // loop through ([all samples] - clk)
1719 for (i = 0; i < *dataLen - clk; ++i) {
1720 int lowSum = 0, highSum = 0;
1721
1722 // sum all samples together starting from this sample for [clk] samples for each tone (multiply tone value with sample data)
1723 for (j = 0; j < clk; ++j) {
1724 lowSum += LowTone[j] * data[i+j];
1725 highSum += HighTone[j] * data[i + j];
1726 }
1727 // get abs( [average sample value per clk] * 100 ) (or a rolling average of sorts)
1728 lowSum = abs(100 * lowSum / clk);
1729 highSum = abs(100 * highSum / clk);
1730 // save these back to buffer for later use
1731 data[i] = (highSum << 16) | lowSum;
1732 }
1733
1734 // now we have the abs( [average sample value per clk] * 100 ) for each tone
1735 // loop through again [all samples] - clk - 16
1736 // note why 16??? is 16 the largest FC? changed to LowToneFC as that should be the > fc
1737 for(i = 0; i < *dataLen - clk - LowToneFC; ++i) {
1738 int lowTot = 0, highTot = 0;
1739
1740 // sum a field clock width of abs( [average sample values per clk] * 100) for each tone
1741 for (j = 0; j < LowToneFC; ++j) { //10 for fsk2
1742 lowTot += (data[i + j] & 0xffff);
1743 }
1744 for (j = 0; j < HighToneFC; j++) { //8 for fsk2
1745 highTot += (data[i + j] >> 16);
1746 }
1747
1748 // subtract the sum of lowTone averages by the sum of highTone averages as it
1749 // and write back the new graph value
1750 data[i] = lowTot - highTot;
1751 }
1752 // update dataLen to what we put back to the data sample buffer
1753 *dataLen -= (clk + LowToneFC);
1754 return 0;
1755 }
1756
1757 int usage_data_fsktonrz() {
1758 PrintAndLog("Usage: data fsktonrz c <clock> l <fc_low> f <fc_high>");
1759 PrintAndLog("Options: ");
1760 PrintAndLog(" h This help");
1761 PrintAndLog(" c <clock> enter the a clock (omit to autodetect)");
1762 PrintAndLog(" l <fc_low> enter a field clock (omit to autodetect)");
1763 PrintAndLog(" f <fc_high> enter a field clock (omit to autodetect)");
1764 return 0;
1765 }
1766
1767 int CmdFSKToNRZ(const char *Cmd) {
1768 // take clk, fc_low, fc_high
1769 // blank = auto;
1770 bool errors = false;
1771 int clk = 0;
1772 char cmdp = 0;
1773 int fc_low = 10, fc_high = 8;
1774 while(param_getchar(Cmd, cmdp) != 0x00)
1775 {
1776 switch(param_getchar(Cmd, cmdp))
1777 {
1778 case 'h':
1779 case 'H':
1780 return usage_data_fsktonrz();
1781 case 'C':
1782 case 'c':
1783 clk = param_get32ex(Cmd, cmdp+1, 0, 10);
1784 cmdp += 2;
1785 break;
1786 case 'F':
1787 case 'f':
1788 fc_high = param_get32ex(Cmd, cmdp+1, 0, 10);
1789 cmdp += 2;
1790 break;
1791 case 'L':
1792 case 'l':
1793 fc_low = param_get32ex(Cmd, cmdp+1, 0, 10);
1794 cmdp += 2;
1795 break;
1796 default:
1797 PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
1798 errors = true;
1799 break;
1800 }
1801 if(errors) break;
1802 }
1803 //Validations
1804 if(errors) return usage_data_fsktonrz();
1805
1806 setClockGrid(0,0);
1807 DemodBufferLen = 0;
1808 int ans = FSKToNRZ(GraphBuffer, &GraphTraceLen, clk, fc_low, fc_high);
1809 CmdNorm("");
1810 RepaintGraphWindow();
1811 return ans;
1812 }
1813
1814
1815 static command_t CommandTable[] =
1816 {
1817 {"help", CmdHelp, 1, "This help"},
1818 {"askedgedetect", CmdAskEdgeDetect, 1, "[threshold] Adjust Graph for manual ask demod using the length of sample differences to detect the edge of a wave (use 20-45, def:25)"},
1819 {"autocorr", CmdAutoCorr, 1, "[window length] [g] -- Autocorrelation over window - g to save back to GraphBuffer (overwrite)"},
1820 {"biphaserawdecode",CmdBiphaseDecodeRaw,1, "[offset] [invert<0|1>] [maxErr] -- Biphase decode bin stream in DemodBuffer (offset = 0|1 bits to shift the decode start)"},
1821 {"bin2hex", Cmdbin2hex, 1, "bin2hex <digits> -- Converts binary to hexadecimal"},
1822 {"bitsamples", CmdBitsamples, 0, "Get raw samples as bitstring"},
1823 {"buffclear", CmdBuffClear, 1, "Clear sample buffer and graph window"},
1824 {"dec", CmdDec, 1, "Decimate samples"},
1825 {"detectclock", CmdDetectClockRate, 1, "[modulation] Detect clock rate of wave in GraphBuffer (options: 'a','f','n','p' for ask, fsk, nrz, psk respectively)"},
1826 {"fsktonrz", CmdFSKToNRZ, 1, "Convert fsk2 to nrz wave for alternate fsk demodulating (for weak fsk)"},
1827 {"getbitstream", CmdGetBitStream, 1, "Convert GraphBuffer's >=1 values to 1 and <1 to 0"},
1828 {"grid", CmdGrid, 1, "<x> <y> -- overlay grid on graph window, use zero value to turn off either"},
1829 {"hexsamples", CmdHexsamples, 0, "<bytes> [<offset>] -- Dump big buffer as hex bytes"},
1830 {"hex2bin", Cmdhex2bin, 1, "hex2bin <hexadecimal> -- Converts hexadecimal to binary"},
1831 {"hide", CmdHide, 1, "Hide graph window"},
1832 {"hpf", CmdHpf, 1, "Remove DC offset from trace"},
1833 {"load", CmdLoad, 1, "<filename> -- Load trace (to graph window"},
1834 {"ltrim", CmdLtrim, 1, "<samples> -- Trim samples from left of trace"},
1835 {"rtrim", CmdRtrim, 1, "<location to end trace> -- Trim samples from right of trace"},
1836 {"mtrim", CmdMtrim, 1, "<start> <stop> -- Trim out samples from the specified start to the specified stop"},
1837 {"manrawdecode", Cmdmandecoderaw, 1, "[invert] [maxErr] -- Manchester decode binary stream in DemodBuffer"},
1838 {"norm", CmdNorm, 1, "Normalize max/min to +/-128"},
1839 {"plot", CmdPlot, 1, "Show graph window (hit 'h' in window for keystroke help)"},
1840 {"printdemodbuffer",CmdPrintDemodBuff, 1, "[x] [o] <offset> [l] <length> -- print the data in the DemodBuffer - 'x' for hex output"},
1841 {"rawdemod", CmdRawDemod, 1, "[modulation] ... <options> -see help (h option) -- Demodulate the data in the GraphBuffer and output binary"},
1842 {"samples", CmdSamples, 0, "[512 - 40000] -- Get raw samples for graph window (GraphBuffer)"},
1843 {"save", CmdSave, 1, "<filename> -- Save trace (from graph window)"},
1844 {"setgraphmarkers", CmdSetGraphMarkers, 1, "[orange_marker] [blue_marker] (in graph window)"},
1845 {"scale", CmdScale, 1, "<int> -- Set cursor display scale"},
1846 {"setdebugmode", CmdSetDebugMode, 1, "<0|1|2> -- Turn on or off Debugging Level for lf demods"},
1847 {"shiftgraphzero", CmdGraphShiftZero, 1, "<shift> -- Shift 0 for Graphed wave + or - shift value"},
1848 {"dirthreshold", CmdDirectionalThreshold, 1, "<thres up> <thres down> -- Max rising higher up-thres/ Min falling lower down-thres, keep rest as prev."},
1849 {"tune", CmdTuneSamples, 0, "Get hw tune samples for graph window"},
1850 {"undec", CmdUndec, 1, "Un-decimate samples by 2"},
1851 {"zerocrossings", CmdZerocrossings, 1, "Count time between zero-crossings"},
1852 {NULL, NULL, 0, NULL}
1853 };
1854
1855 int CmdData(const char *Cmd)
1856 {
1857 CmdsParse(CommandTable, Cmd);
1858 return 0;
1859 }
1860
1861 int CmdHelp(const char *Cmd)
1862 {
1863 CmdsHelp(CommandTable);
1864 return 0;
1865 }
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