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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>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <limits.h>
15 //#include "proxusb.h"
16 #include "proxmark3.h"
17 #include "data.h"
18 #include "ui.h"
19 #include "graph.h"
20 #include "cmdparser.h"
21 #include "cmdmain.h"
22 #include "cmddata.h"
23
24 static int CmdHelp(const char *Cmd);
25
26 int CmdAmp(const char *Cmd)
27 {
28 int i, rising, falling;
29 int max = INT_MIN, min = INT_MAX;
30
31 for (i = 10; i < GraphTraceLen; ++i) {
32 if (GraphBuffer[i] > max)
33 max = GraphBuffer[i];
34 if (GraphBuffer[i] < min)
35 min = GraphBuffer[i];
36 }
37
38 if (max != min) {
39 rising = falling= 0;
40 for (i = 0; i < GraphTraceLen; ++i) {
41 if (GraphBuffer[i + 1] < GraphBuffer[i]) {
42 if (rising) {
43 GraphBuffer[i] = max;
44 rising = 0;
45 }
46 falling = 1;
47 }
48 if (GraphBuffer[i + 1] > GraphBuffer[i]) {
49 if (falling) {
50 GraphBuffer[i] = min;
51 falling = 0;
52 }
53 rising= 1;
54 }
55 }
56 }
57 RepaintGraphWindow();
58 return 0;
59 }
60
61 /*
62 * Generic command to demodulate ASK.
63 *
64 * Argument is convention: positive or negative (High mod means zero
65 * or high mod means one)
66 *
67 * Updates the Graph trace with 0/1 values
68 *
69 * Arguments:
70 * c : 0 or 1
71 */
72 int Cmdaskdemod(const char *Cmd)
73 {
74 int i;
75 int c, high = 0, low = 0;
76
77 // TODO: complain if we do not give 2 arguments here !
78 // (AL - this doesn't make sense! we're only using one argument!!!)
79 sscanf(Cmd, "%i", &c);
80
81 /* Detect high and lows and clock */
82 // (AL - clock???)
83 for (i = 0; i < GraphTraceLen; ++i)
84 {
85 if (GraphBuffer[i] > high)
86 high = GraphBuffer[i];
87 else if (GraphBuffer[i] < low)
88 low = GraphBuffer[i];
89 }
90 if (c != 0 && c != 1) {
91 PrintAndLog("Invalid argument: %s", Cmd);
92 return 0;
93 }
94
95 if (GraphBuffer[0] > 0) {
96 GraphBuffer[0] = 1-c;
97 } else {
98 GraphBuffer[0] = c;
99 }
100 for (i = 1; i < GraphTraceLen; ++i) {
101 /* Transitions are detected at each peak
102 * Transitions are either:
103 * - we're low: transition if we hit a high
104 * - we're high: transition if we hit a low
105 * (we need to do it this way because some tags keep high or
106 * low for long periods, others just reach the peak and go
107 * down)
108 */
109 if ((GraphBuffer[i] == high) && (GraphBuffer[i - 1] == c)) {
110 GraphBuffer[i] = 1 - c;
111 } else if ((GraphBuffer[i] == low) && (GraphBuffer[i - 1] == (1 - c))){
112 GraphBuffer[i] = c;
113 } else {
114 /* No transition */
115 GraphBuffer[i] = GraphBuffer[i - 1];
116 }
117 }
118 RepaintGraphWindow();
119 return 0;
120 }
121
122 int CmdAutoCorr(const char *Cmd)
123 {
124 static int CorrelBuffer[MAX_GRAPH_TRACE_LEN];
125
126 int window = atoi(Cmd);
127
128 if (window == 0) {
129 PrintAndLog("needs a window");
130 return 0;
131 }
132 if (window >= GraphTraceLen) {
133 PrintAndLog("window must be smaller than trace (%d samples)",
134 GraphTraceLen);
135 return 0;
136 }
137
138 PrintAndLog("performing %d correlations", GraphTraceLen - window);
139
140 for (int i = 0; i < GraphTraceLen - window; ++i) {
141 int sum = 0;
142 for (int j = 0; j < window; ++j) {
143 sum += (GraphBuffer[j]*GraphBuffer[i + j]) / 256;
144 }
145 CorrelBuffer[i] = sum;
146 }
147 GraphTraceLen = GraphTraceLen - window;
148 memcpy(GraphBuffer, CorrelBuffer, GraphTraceLen * sizeof (int));
149
150 RepaintGraphWindow();
151 return 0;
152 }
153
154 int CmdBitsamples(const char *Cmd)
155 {
156 int cnt = 0;
157 int n = 3072;
158
159 for (int i = 0; i < n; i += 12) {
160 UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
161 SendCommand(&c);
162 WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, NULL);
163
164 for (int j = 0; j < 48; j++) {
165 for (int k = 0; k < 8; k++) {
166 if(sample_buf[j] & (1 << (7 - k))) {
167 GraphBuffer[cnt++] = 1;
168 } else {
169 GraphBuffer[cnt++] = 0;
170 }
171 }
172 }
173 }
174 GraphTraceLen = cnt;
175 RepaintGraphWindow();
176 return 0;
177 }
178
179 /*
180 * Convert to a bitstream
181 */
182 int CmdBitstream(const char *Cmd)
183 {
184 int i, j;
185 int bit;
186 int gtl;
187 int clock;
188 int low = 0;
189 int high = 0;
190 int hithigh, hitlow, first;
191
192 /* Detect high and lows and clock */
193 for (i = 0; i < GraphTraceLen; ++i)
194 {
195 if (GraphBuffer[i] > high)
196 high = GraphBuffer[i];
197 else if (GraphBuffer[i] < low)
198 low = GraphBuffer[i];
199 }
200
201 /* Get our clock */
202 clock = GetClock(Cmd, high, 1);
203 gtl = ClearGraph(0);
204
205 bit = 0;
206 for (i = 0; i < (int)(gtl / clock); ++i)
207 {
208 hithigh = 0;
209 hitlow = 0;
210 first = 1;
211 /* Find out if we hit both high and low peaks */
212 for (j = 0; j < clock; ++j)
213 {
214 if (GraphBuffer[(i * clock) + j] == high)
215 hithigh = 1;
216 else if (GraphBuffer[(i * clock) + j] == low)
217 hitlow = 1;
218 /* it doesn't count if it's the first part of our read
219 because it's really just trailing from the last sequence */
220 if (first && (hithigh || hitlow))
221 hithigh = hitlow = 0;
222 else
223 first = 0;
224
225 if (hithigh && hitlow)
226 break;
227 }
228
229 /* If we didn't hit both high and low peaks, we had a bit transition */
230 if (!hithigh || !hitlow)
231 bit ^= 1;
232
233 AppendGraph(0, clock, bit);
234 // for (j = 0; j < (int)(clock/2); j++)
235 // GraphBuffer[(i * clock) + j] = bit ^ 1;
236 // for (j = (int)(clock/2); j < clock; j++)
237 // GraphBuffer[(i * clock) + j] = bit;
238 }
239
240 RepaintGraphWindow();
241 return 0;
242 }
243
244 int CmdBuffClear(const char *Cmd)
245 {
246 UsbCommand c = {CMD_BUFF_CLEAR};
247 SendCommand(&c);
248 ClearGraph(true);
249 return 0;
250 }
251
252 int CmdDec(const char *Cmd)
253 {
254 for (int i = 0; i < (GraphTraceLen / 2); ++i)
255 GraphBuffer[i] = GraphBuffer[i * 2];
256 GraphTraceLen /= 2;
257 PrintAndLog("decimated by 2");
258 RepaintGraphWindow();
259 return 0;
260 }
261
262 /* Print our clock rate */
263 int CmdDetectClockRate(const char *Cmd)
264 {
265 int clock = DetectClock(0);
266 PrintAndLog("Auto-detected clock rate: %d", clock);
267 return 0;
268 }
269
270 int CmdFSKdemod(const char *Cmd)
271 {
272 static const int LowTone[] = {
273 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
274 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
275 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
276 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
277 1, 1, 1, 1, 1, -1, -1, -1, -1, -1
278 };
279 static const int HighTone[] = {
280 1, 1, 1, 1, 1, -1, -1, -1, -1,
281 1, 1, 1, 1, -1, -1, -1, -1,
282 1, 1, 1, 1, -1, -1, -1, -1,
283 1, 1, 1, 1, -1, -1, -1, -1,
284 1, 1, 1, 1, -1, -1, -1, -1,
285 1, 1, 1, 1, -1, -1, -1, -1, -1,
286 };
287
288 int lowLen = sizeof (LowTone) / sizeof (int);
289 int highLen = sizeof (HighTone) / sizeof (int);
290 int convLen = (highLen > lowLen) ? highLen : lowLen;
291 uint32_t hi = 0, lo = 0;
292
293 int i, j;
294 int minMark = 0, maxMark = 0;
295
296 for (i = 0; i < GraphTraceLen - convLen; ++i) {
297 int lowSum = 0, highSum = 0;
298
299 for (j = 0; j < lowLen; ++j) {
300 lowSum += LowTone[j]*GraphBuffer[i+j];
301 }
302 for (j = 0; j < highLen; ++j) {
303 highSum += HighTone[j] * GraphBuffer[i + j];
304 }
305 lowSum = abs(100 * lowSum / lowLen);
306 highSum = abs(100 * highSum / highLen);
307 GraphBuffer[i] = (highSum << 16) | lowSum;
308 }
309
310 for(i = 0; i < GraphTraceLen - convLen - 16; ++i) {
311 int lowTot = 0, highTot = 0;
312 // 10 and 8 are f_s divided by f_l and f_h, rounded
313 for (j = 0; j < 10; ++j) {
314 lowTot += (GraphBuffer[i+j] & 0xffff);
315 }
316 for (j = 0; j < 8; j++) {
317 highTot += (GraphBuffer[i + j] >> 16);
318 }
319 GraphBuffer[i] = lowTot - highTot;
320 if (GraphBuffer[i] > maxMark) maxMark = GraphBuffer[i];
321 if (GraphBuffer[i] < minMark) minMark = GraphBuffer[i];
322 }
323
324 GraphTraceLen -= (convLen + 16);
325 RepaintGraphWindow();
326
327 // Find bit-sync (3 lo followed by 3 high)
328 int max = 0, maxPos = 0;
329 for (i = 0; i < 6000; ++i) {
330 int dec = 0;
331 for (j = 0; j < 3 * lowLen; ++j) {
332 dec -= GraphBuffer[i + j];
333 }
334 for (; j < 3 * (lowLen + highLen ); ++j) {
335 dec += GraphBuffer[i + j];
336 }
337 if (dec > max) {
338 max = dec;
339 maxPos = i;
340 }
341 }
342
343 // place start of bit sync marker in graph
344 GraphBuffer[maxPos] = maxMark;
345 GraphBuffer[maxPos + 1] = minMark;
346
347 maxPos += j;
348
349 // place end of bit sync marker in graph
350 GraphBuffer[maxPos] = maxMark;
351 GraphBuffer[maxPos+1] = minMark;
352
353 PrintAndLog("actual data bits start at sample %d", maxPos);
354 PrintAndLog("length %d/%d", highLen, lowLen);
355
356 uint8_t bits[46];
357 bits[sizeof(bits)-1] = '\0';
358
359 // find bit pairs and manchester decode them
360 for (i = 0; i < arraylen(bits) - 1; ++i) {
361 int dec = 0;
362 for (j = 0; j < lowLen; ++j) {
363 dec -= GraphBuffer[maxPos + j];
364 }
365 for (; j < lowLen + highLen; ++j) {
366 dec += GraphBuffer[maxPos + j];
367 }
368 maxPos += j;
369 // place inter bit marker in graph
370 GraphBuffer[maxPos] = maxMark;
371 GraphBuffer[maxPos + 1] = minMark;
372
373 // hi and lo form a 64 bit pair
374 hi = (hi << 1) | (lo >> 31);
375 lo = (lo << 1);
376 // store decoded bit as binary (in hi/lo) and text (in bits[])
377 if(dec < 0) {
378 bits[i] = '1';
379 lo |= 1;
380 } else {
381 bits[i] = '0';
382 }
383 }
384 PrintAndLog("bits: '%s'", bits);
385 PrintAndLog("hex: %08x %08x", hi, lo);
386 return 0;
387 }
388
389 int CmdGrid(const char *Cmd)
390 {
391 sscanf(Cmd, "%i %i", &PlotGridX, &PlotGridY);
392 PlotGridXdefault= PlotGridX;
393 PlotGridYdefault= PlotGridY;
394 RepaintGraphWindow();
395 return 0;
396 }
397
398 int CmdHexsamples(const char *Cmd)
399 {
400 int n;
401 int requested = 0;
402 int offset = 0;
403 sscanf(Cmd, "%i %i", &requested, &offset);
404 if (offset % 4 != 0) {
405 PrintAndLog("Offset must be a multiple of 4");
406 return 0;
407 }
408 offset = offset/4;
409
410 int delivered = 0;
411
412 if (requested == 0) {
413 n = 12;
414 requested = 12;
415 } else {
416 n = requested/4;
417 }
418
419 for (int i = offset; i < n+offset; i += 12) {
420 UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
421 SendCommand(&c);
422 WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, NULL);
423 for (int j = 0; j < 48; j += 8) {
424 PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x",
425 sample_buf[j+0],
426 sample_buf[j+1],
427 sample_buf[j+2],
428 sample_buf[j+3],
429 sample_buf[j+4],
430 sample_buf[j+5],
431 sample_buf[j+6],
432 sample_buf[j+7],
433 sample_buf[j+8]
434 );
435 delivered += 8;
436 if (delivered >= requested)
437 break;
438 }
439 if (delivered >= requested)
440 break;
441 }
442 return 0;
443 }
444
445 int CmdHide(const char *Cmd)
446 {
447 HideGraphWindow();
448 return 0;
449 }
450
451 int CmdHpf(const char *Cmd)
452 {
453 int i;
454 int accum = 0;
455
456 for (i = 10; i < GraphTraceLen; ++i)
457 accum += GraphBuffer[i];
458 accum /= (GraphTraceLen - 10);
459 for (i = 0; i < GraphTraceLen; ++i)
460 GraphBuffer[i] -= accum;
461
462 RepaintGraphWindow();
463 return 0;
464 }
465
466 int CmdSamples(const char *Cmd)
467 {
468 int cnt = 0;
469 int n;
470
471 n = strtol(Cmd, NULL, 0);
472 if (n == 0) n = 128;
473 if (n > 16000) n = 16000;
474
475 PrintAndLog("Reading %d samples\n", n);
476 for (int i = 0; i < n; i += 12) {
477 UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
478 SendCommand(&c);
479 WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, NULL);
480 for (int j = 0; j < 48; j++) {
481 GraphBuffer[cnt++] = ((int)sample_buf[j]) - 128;
482 }
483 }
484 PrintAndLog("Done!\n");
485 GraphTraceLen = n*4;
486 RepaintGraphWindow();
487 return 0;
488 }
489
490 int CmdLoad(const char *Cmd)
491 {
492 FILE *f = fopen(Cmd, "r");
493 if (!f) {
494 PrintAndLog("couldn't open '%s'", Cmd);
495 return 0;
496 }
497
498 GraphTraceLen = 0;
499 char line[80];
500 while (fgets(line, sizeof (line), f)) {
501 GraphBuffer[GraphTraceLen] = atoi(line);
502 GraphTraceLen++;
503 }
504 fclose(f);
505 PrintAndLog("loaded %d samples", GraphTraceLen);
506 RepaintGraphWindow();
507 return 0;
508 }
509
510 int CmdLtrim(const char *Cmd)
511 {
512 int ds = atoi(Cmd);
513
514 for (int i = ds; i < GraphTraceLen; ++i)
515 GraphBuffer[i-ds] = GraphBuffer[i];
516 GraphTraceLen -= ds;
517
518 RepaintGraphWindow();
519 return 0;
520 }
521
522 /*
523 * Manchester demodulate a bitstream. The bitstream needs to be already in
524 * the GraphBuffer as 0 and 1 values
525 *
526 * Give the clock rate as argument in order to help the sync - the algorithm
527 * resyncs at each pulse anyway.
528 *
529 * Not optimized by any means, this is the 1st time I'm writing this type of
530 * routine, feel free to improve...
531 *
532 * 1st argument: clock rate (as number of samples per clock rate)
533 * Typical values can be 64, 32, 128...
534 */
535 int CmdManchesterDemod(const char *Cmd)
536 {
537 int i, j, invert= 0;
538 int bit;
539 int clock;
540 int lastval = 0;
541 int low = 0;
542 int high = 0;
543 int hithigh, hitlow, first;
544 int lc = 0;
545 int bitidx = 0;
546 int bit2idx = 0;
547 int warnings = 0;
548
549 /* check if we're inverting output */
550 if (*Cmd == 'i')
551 {
552 PrintAndLog("Inverting output");
553 invert = 1;
554 ++Cmd;
555 do
556 ++Cmd;
557 while(*Cmd == ' '); // in case a 2nd argument was given
558 }
559
560 /* Holds the decoded bitstream: each clock period contains 2 bits */
561 /* later simplified to 1 bit after manchester decoding. */
562 /* Add 10 bits to allow for noisy / uncertain traces without aborting */
563 /* int BitStream[GraphTraceLen*2/clock+10]; */
564
565 /* But it does not work if compiling on WIndows: therefore we just allocate a */
566 /* large array */
567 uint8_t BitStream[MAX_GRAPH_TRACE_LEN];
568
569 /* Detect high and lows */
570 for (i = 0; i < GraphTraceLen; i++)
571 {
572 if (GraphBuffer[i] > high)
573 high = GraphBuffer[i];
574 else if (GraphBuffer[i] < low)
575 low = GraphBuffer[i];
576 }
577
578 /* Get our clock */
579 clock = GetClock(Cmd, high, 1);
580
581 int tolerance = clock/4;
582
583 /* Detect first transition */
584 /* Lo-Hi (arbitrary) */
585 /* skip to the first high */
586 for (i= 0; i < GraphTraceLen; i++)
587 if (GraphBuffer[i] == high)
588 break;
589 /* now look for the first low */
590 for (; i < GraphTraceLen; i++)
591 {
592 if (GraphBuffer[i] == low)
593 {
594 lastval = i;
595 break;
596 }
597 }
598
599 /* If we're not working with 1/0s, demod based off clock */
600 if (high != 1)
601 {
602 bit = 0; /* We assume the 1st bit is zero, it may not be
603 * the case: this routine (I think) has an init problem.
604 * Ed.
605 */
606 for (; i < (int)(GraphTraceLen / clock); i++)
607 {
608 hithigh = 0;
609 hitlow = 0;
610 first = 1;
611
612 /* Find out if we hit both high and low peaks */
613 for (j = 0; j < clock; j++)
614 {
615 if (GraphBuffer[(i * clock) + j] == high)
616 hithigh = 1;
617 else if (GraphBuffer[(i * clock) + j] == low)
618 hitlow = 1;
619
620 /* it doesn't count if it's the first part of our read
621 because it's really just trailing from the last sequence */
622 if (first && (hithigh || hitlow))
623 hithigh = hitlow = 0;
624 else
625 first = 0;
626
627 if (hithigh && hitlow)
628 break;
629 }
630
631 /* If we didn't hit both high and low peaks, we had a bit transition */
632 if (!hithigh || !hitlow)
633 bit ^= 1;
634
635 BitStream[bit2idx++] = bit ^ invert;
636 }
637 }
638
639 /* standard 1/0 bitstream */
640 else
641 {
642
643 /* Then detect duration between 2 successive transitions */
644 for (bitidx = 1; i < GraphTraceLen; i++)
645 {
646 if (GraphBuffer[i-1] != GraphBuffer[i])
647 {
648 lc = i-lastval;
649 lastval = i;
650
651 // Error check: if bitidx becomes too large, we do not
652 // have a Manchester encoded bitstream or the clock is really
653 // wrong!
654 if (bitidx > (GraphTraceLen*2/clock+8) ) {
655 PrintAndLog("Error: the clock you gave is probably wrong, aborting.");
656 return 0;
657 }
658 // Then switch depending on lc length:
659 // Tolerance is 1/4 of clock rate (arbitrary)
660 if (abs(lc-clock/2) < tolerance) {
661 // Short pulse : either "1" or "0"
662 BitStream[bitidx++]=GraphBuffer[i-1];
663 } else if (abs(lc-clock) < tolerance) {
664 // Long pulse: either "11" or "00"
665 BitStream[bitidx++]=GraphBuffer[i-1];
666 BitStream[bitidx++]=GraphBuffer[i-1];
667 } else {
668 // Error
669 warnings++;
670 PrintAndLog("Warning: Manchester decode error for pulse width detection.");
671 PrintAndLog("(too many of those messages mean either the stream is not Manchester encoded, or clock is wrong)");
672
673 if (warnings > 10)
674 {
675 PrintAndLog("Error: too many detection errors, aborting.");
676 return 0;
677 }
678 }
679 }
680 }
681
682 // At this stage, we now have a bitstream of "01" ("1") or "10" ("0"), parse it into final decoded bitstream
683 // Actually, we overwrite BitStream with the new decoded bitstream, we just need to be careful
684 // to stop output at the final bitidx2 value, not bitidx
685 for (i = 0; i < bitidx; i += 2) {
686 if ((BitStream[i] == 0) && (BitStream[i+1] == 1)) {
687 BitStream[bit2idx++] = 1 ^ invert;
688 } else if ((BitStream[i] == 1) && (BitStream[i+1] == 0)) {
689 BitStream[bit2idx++] = 0 ^ invert;
690 } else {
691 // We cannot end up in this state, this means we are unsynchronized,
692 // move up 1 bit:
693 i++;
694 warnings++;
695 PrintAndLog("Unsynchronized, resync...");
696 PrintAndLog("(too many of those messages mean the stream is not Manchester encoded)");
697
698 if (warnings > 10)
699 {
700 PrintAndLog("Error: too many decode errors, aborting.");
701 return 0;
702 }
703 }
704 }
705 }
706
707 PrintAndLog("Manchester decoded bitstream");
708 // Now output the bitstream to the scrollback by line of 16 bits
709 for (i = 0; i < (bit2idx-16); i+=16) {
710 PrintAndLog("%i %i %i %i %i %i %i %i %i %i %i %i %i %i %i %i",
711 BitStream[i],
712 BitStream[i+1],
713 BitStream[i+2],
714 BitStream[i+3],
715 BitStream[i+4],
716 BitStream[i+5],
717 BitStream[i+6],
718 BitStream[i+7],
719 BitStream[i+8],
720 BitStream[i+9],
721 BitStream[i+10],
722 BitStream[i+11],
723 BitStream[i+12],
724 BitStream[i+13],
725 BitStream[i+14],
726 BitStream[i+15]);
727 }
728 return 0;
729 }
730
731 /* Modulate our data into manchester */
732 int CmdManchesterMod(const char *Cmd)
733 {
734 int i, j;
735 int clock;
736 int bit, lastbit, wave;
737
738 /* Get our clock */
739 clock = GetClock(Cmd, 0, 1);
740
741 wave = 0;
742 lastbit = 1;
743 for (i = 0; i < (int)(GraphTraceLen / clock); i++)
744 {
745 bit = GraphBuffer[i * clock] ^ 1;
746
747 for (j = 0; j < (int)(clock/2); j++)
748 GraphBuffer[(i * clock) + j] = bit ^ lastbit ^ wave;
749 for (j = (int)(clock/2); j < clock; j++)
750 GraphBuffer[(i * clock) + j] = bit ^ lastbit ^ wave ^ 1;
751
752 /* Keep track of how we start our wave and if we changed or not this time */
753 wave ^= bit ^ lastbit;
754 lastbit = bit;
755 }
756
757 RepaintGraphWindow();
758 return 0;
759 }
760
761 int CmdNorm(const char *Cmd)
762 {
763 int i;
764 int max = INT_MIN, min = INT_MAX;
765
766 for (i = 10; i < GraphTraceLen; ++i) {
767 if (GraphBuffer[i] > max)
768 max = GraphBuffer[i];
769 if (GraphBuffer[i] < min)
770 min = GraphBuffer[i];
771 }
772
773 if (max != min) {
774 for (i = 0; i < GraphTraceLen; ++i) {
775 GraphBuffer[i] = (GraphBuffer[i] - ((max + min) / 2)) * 1000 /
776 (max - min);
777 }
778 }
779 RepaintGraphWindow();
780 return 0;
781 }
782
783 int CmdPlot(const char *Cmd)
784 {
785 ShowGraphWindow();
786 return 0;
787 }
788
789 int CmdSave(const char *Cmd)
790 {
791 FILE *f = fopen(Cmd, "w");
792 if(!f) {
793 PrintAndLog("couldn't open '%s'", Cmd);
794 return 0;
795 }
796 int i;
797 for (i = 0; i < GraphTraceLen; i++) {
798 fprintf(f, "%d\n", GraphBuffer[i]);
799 }
800 fclose(f);
801 PrintAndLog("saved to '%s'", Cmd);
802 return 0;
803 }
804
805 int CmdScale(const char *Cmd)
806 {
807 CursorScaleFactor = atoi(Cmd);
808 if (CursorScaleFactor == 0) {
809 PrintAndLog("bad, can't have zero scale");
810 CursorScaleFactor = 1;
811 }
812 RepaintGraphWindow();
813 return 0;
814 }
815
816 int CmdThreshold(const char *Cmd)
817 {
818 int threshold = atoi(Cmd);
819
820 for (int i = 0; i < GraphTraceLen; ++i) {
821 if (GraphBuffer[i] >= threshold)
822 GraphBuffer[i] = 1;
823 else
824 GraphBuffer[i] =- 1;
825 }
826 RepaintGraphWindow();
827 return 0;
828 }
829
830 int CmdZerocrossings(const char *Cmd)
831 {
832 // Zero-crossings aren't meaningful unless the signal is zero-mean.
833 CmdHpf("");
834
835 int sign = 1;
836 int zc = 0;
837 int lastZc = 0;
838
839 for (int i = 0; i < GraphTraceLen; ++i) {
840 if (GraphBuffer[i] * sign >= 0) {
841 // No change in sign, reproduce the previous sample count.
842 zc++;
843 GraphBuffer[i] = lastZc;
844 } else {
845 // Change in sign, reset the sample count.
846 sign = -sign;
847 GraphBuffer[i] = lastZc;
848 if (sign > 0) {
849 lastZc = zc;
850 zc = 0;
851 }
852 }
853 }
854
855 RepaintGraphWindow();
856 return 0;
857 }
858
859 static command_t CommandTable[] =
860 {
861 {"help", CmdHelp, 1, "This help"},
862 {"amp", CmdAmp, 1, "Amplify peaks"},
863 {"askdemod", Cmdaskdemod, 1, "<0|1> -- Attempt to demodulate simple ASK tags"},
864 {"autocorr", CmdAutoCorr, 1, "<window length> -- Autocorrelation over window"},
865 {"bitsamples", CmdBitsamples, 0, "Get raw samples as bitstring"},
866 {"bitstream", CmdBitstream, 1, "[clock rate] -- Convert waveform into a bitstream"},
867 {"buffclear", CmdBuffClear, 1, "Clear sample buffer and graph window"},
868 {"dec", CmdDec, 1, "Decimate samples"},
869 {"detectclock", CmdDetectClockRate, 1, "Detect clock rate"},
870 {"fskdemod", CmdFSKdemod, 1, "Demodulate graph window as a HID FSK"},
871 {"grid", CmdGrid, 1, "<x> <y> -- overlay grid on graph window, use zero value to turn off either"},
872 {"hexsamples", CmdHexsamples, 0, "<blocks> [<offset>] -- Dump big buffer as hex bytes"},
873 {"hide", CmdHide, 1, "Hide graph window"},
874 {"hpf", CmdHpf, 1, "Remove DC offset from trace"},
875 {"load", CmdLoad, 1, "<filename> -- Load trace (to graph window"},
876 {"ltrim", CmdLtrim, 1, "<samples> -- Trim samples from left of trace"},
877 {"mandemod", CmdManchesterDemod, 1, "[i] [clock rate] -- Manchester demodulate binary stream (option 'i' to invert output)"},
878 {"manmod", CmdManchesterMod, 1, "[clock rate] -- Manchester modulate a binary stream"},
879 {"norm", CmdNorm, 1, "Normalize max/min to +/-500"},
880 {"plot", CmdPlot, 1, "Show graph window (hit 'h' in window for keystroke help)"},
881 {"samples", CmdSamples, 0, "[128 - 16000] -- Get raw samples for graph window"},
882 {"save", CmdSave, 1, "<filename> -- Save trace (from graph window)"},
883 {"scale", CmdScale, 1, "<int> -- Set cursor display scale"},
884 {"threshold", CmdThreshold, 1, "<threshold> -- Maximize/minimize every value in the graph window depending on threshold"},
885 {"zerocrossings", CmdZerocrossings, 1, "Count time between zero-crossings"},
886 {NULL, NULL, 0, NULL}
887 };
888
889 int CmdData(const char *Cmd)
890 {
891 CmdsParse(CommandTable, Cmd);
892 return 0;
893 }
894
895 int CmdHelp(const char *Cmd)
896 {
897 CmdsHelp(CommandTable);
898 return 0;
899 }
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