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1 | //----------------------------------------------------------------------------- | |
2 | // Jonathan Westhues, split Nov 2006 | |
3 | // Modified by Greg Jones, Jan 2009 | |
4 | // Modified by Adrian Dabrowski "atrox", Mar-Sept 2010,Oct 2011 | |
5 | // Modified by piwi, Oct 2018 | |
6 | // | |
7 | // This code is licensed to you under the terms of the GNU GPL, version 2 or, | |
8 | // at your option, any later version. See the LICENSE.txt file for the text of | |
9 | // the license. | |
10 | //----------------------------------------------------------------------------- | |
11 | // Routines to support ISO 15693. This includes both the reader software and | |
12 | // the `fake tag' modes. | |
13 | //----------------------------------------------------------------------------- | |
14 | ||
15 | // The ISO 15693 describes two transmission modes from reader to tag, and four | |
16 | // transmission modes from tag to reader. As of Oct 2018 this code supports | |
17 | // both reader modes and the high speed variant with one subcarrier from card to reader. | |
18 | // As long as the card fully support ISO 15693 this is no problem, since the | |
19 | // reader chooses both data rates, but some non-standard tags do not. | |
20 | // For card simulation, the code supports both high and low speed modes with one subcarrier. | |
21 | // | |
22 | // VCD (reader) -> VICC (tag) | |
23 | // 1 out of 256: | |
24 | // data rate: 1,66 kbit/s (fc/8192) | |
25 | // used for long range | |
26 | // 1 out of 4: | |
27 | // data rate: 26,48 kbit/s (fc/512) | |
28 | // used for short range, high speed | |
29 | // | |
30 | // VICC (tag) -> VCD (reader) | |
31 | // Modulation: | |
32 | // ASK / one subcarrier (423,75 khz) | |
33 | // FSK / two subcarriers (423,75 khz && 484,28 khz) | |
34 | // Data Rates / Modes: | |
35 | // low ASK: 6,62 kbit/s | |
36 | // low FSK: 6.67 kbit/s | |
37 | // high ASK: 26,48 kbit/s | |
38 | // high FSK: 26,69 kbit/s | |
39 | //----------------------------------------------------------------------------- | |
40 | ||
41 | ||
42 | // Random Remarks: | |
43 | // *) UID is always used "transmission order" (LSB), which is reverse to display order | |
44 | ||
45 | // TODO / BUGS / ISSUES: | |
46 | // *) signal decoding is unable to detect collisions. | |
47 | // *) add anti-collision support for inventory-commands | |
48 | // *) read security status of a block | |
49 | // *) sniffing and simulation do not support two subcarrier modes. | |
50 | // *) remove or refactor code under "deprecated" | |
51 | // *) document all the functions | |
52 | ||
53 | #include "iso15693.h" | |
54 | ||
55 | #include "proxmark3.h" | |
56 | #include "util.h" | |
57 | #include "apps.h" | |
58 | #include "string.h" | |
59 | #include "iso15693tools.h" | |
60 | #include "protocols.h" | |
61 | #include "cmd.h" | |
62 | #include "BigBuf.h" | |
63 | #include "fpgaloader.h" | |
64 | ||
65 | #define arraylen(x) (sizeof(x)/sizeof((x)[0])) | |
66 | ||
67 | static int DEBUG = 0; | |
68 | ||
69 | /////////////////////////////////////////////////////////////////////// | |
70 | // ISO 15693 Part 2 - Air Interface | |
71 | // This section basicly contains transmission and receiving of bits | |
72 | /////////////////////////////////////////////////////////////////////// | |
73 | ||
74 | #define Crc(data,datalen) Iso15693Crc(data,datalen) | |
75 | #define AddCrc(data,datalen) Iso15693AddCrc(data,datalen) | |
76 | #define sprintUID(target,uid) Iso15693sprintUID(target,uid) | |
77 | ||
78 | // buffers | |
79 | #define ISO15693_DMA_BUFFER_SIZE 2048 // must be a power of 2 | |
80 | #define ISO15693_MAX_RESPONSE_LENGTH 36 // allows read single block with the maximum block size of 256bits. Read multiple blocks not supported yet | |
81 | #define ISO15693_MAX_COMMAND_LENGTH 45 // allows write single block with the maximum block size of 256bits. Write multiple blocks not supported yet | |
82 | ||
83 | // timing. Delays in SSP_CLK ticks. | |
84 | #define DELAY_READER_TO_ARM 8 | |
85 | #define DELAY_ARM_TO_READER 1 | |
86 | #define DELAY_ISO15693_VCD_TO_VICC 132 // 132/423.75kHz = 311.5us from end of EOF to start of tag response | |
87 | #define DELAY_ISO15693_VICC_TO_VCD 1017 // 1017/3.39MHz = 300us between end of tag response and next reader command | |
88 | ||
89 | // --------------------------- | |
90 | // Signal Processing | |
91 | // --------------------------- | |
92 | ||
93 | // prepare data using "1 out of 4" code for later transmission | |
94 | // resulting data rate is 26.48 kbit/s (fc/512) | |
95 | // cmd ... data | |
96 | // n ... length of data | |
97 | static void CodeIso15693AsReader(uint8_t *cmd, int n) | |
98 | { | |
99 | int i, j; | |
100 | ||
101 | ToSendReset(); | |
102 | ||
103 | // Give it a bit of slack at the beginning | |
104 | for(i = 0; i < 24; i++) { | |
105 | ToSendStuffBit(1); | |
106 | } | |
107 | ||
108 | // SOF for 1of4 | |
109 | ToSendStuffBit(0); | |
110 | ToSendStuffBit(1); | |
111 | ToSendStuffBit(1); | |
112 | ToSendStuffBit(1); | |
113 | ToSendStuffBit(1); | |
114 | ToSendStuffBit(0); | |
115 | ToSendStuffBit(1); | |
116 | ToSendStuffBit(1); | |
117 | for(i = 0; i < n; i++) { | |
118 | for(j = 0; j < 8; j += 2) { | |
119 | int these = (cmd[i] >> j) & 3; | |
120 | switch(these) { | |
121 | case 0: | |
122 | ToSendStuffBit(1); | |
123 | ToSendStuffBit(0); | |
124 | ToSendStuffBit(1); | |
125 | ToSendStuffBit(1); | |
126 | ToSendStuffBit(1); | |
127 | ToSendStuffBit(1); | |
128 | ToSendStuffBit(1); | |
129 | ToSendStuffBit(1); | |
130 | break; | |
131 | case 1: | |
132 | ToSendStuffBit(1); | |
133 | ToSendStuffBit(1); | |
134 | ToSendStuffBit(1); | |
135 | ToSendStuffBit(0); | |
136 | ToSendStuffBit(1); | |
137 | ToSendStuffBit(1); | |
138 | ToSendStuffBit(1); | |
139 | ToSendStuffBit(1); | |
140 | break; | |
141 | case 2: | |
142 | ToSendStuffBit(1); | |
143 | ToSendStuffBit(1); | |
144 | ToSendStuffBit(1); | |
145 | ToSendStuffBit(1); | |
146 | ToSendStuffBit(1); | |
147 | ToSendStuffBit(0); | |
148 | ToSendStuffBit(1); | |
149 | ToSendStuffBit(1); | |
150 | break; | |
151 | case 3: | |
152 | ToSendStuffBit(1); | |
153 | ToSendStuffBit(1); | |
154 | ToSendStuffBit(1); | |
155 | ToSendStuffBit(1); | |
156 | ToSendStuffBit(1); | |
157 | ToSendStuffBit(1); | |
158 | ToSendStuffBit(1); | |
159 | ToSendStuffBit(0); | |
160 | break; | |
161 | } | |
162 | } | |
163 | } | |
164 | // EOF | |
165 | ToSendStuffBit(1); | |
166 | ToSendStuffBit(1); | |
167 | ToSendStuffBit(0); | |
168 | ToSendStuffBit(1); | |
169 | ||
170 | // Fill remainder of last byte with 1 | |
171 | for(i = 0; i < 4; i++) { | |
172 | ToSendStuffBit(1); | |
173 | } | |
174 | ||
175 | ToSendMax++; | |
176 | } | |
177 | ||
178 | // encode data using "1 out of 256" scheme | |
179 | // data rate is 1,66 kbit/s (fc/8192) | |
180 | // is designed for more robust communication over longer distances | |
181 | static void CodeIso15693AsReader256(uint8_t *cmd, int n) | |
182 | { | |
183 | int i, j; | |
184 | ||
185 | ToSendReset(); | |
186 | ||
187 | // Give it a bit of slack at the beginning | |
188 | for(i = 0; i < 24; i++) { | |
189 | ToSendStuffBit(1); | |
190 | } | |
191 | ||
192 | // SOF for 1of256 | |
193 | ToSendStuffBit(0); | |
194 | ToSendStuffBit(1); | |
195 | ToSendStuffBit(1); | |
196 | ToSendStuffBit(1); | |
197 | ToSendStuffBit(1); | |
198 | ToSendStuffBit(1); | |
199 | ToSendStuffBit(1); | |
200 | ToSendStuffBit(0); | |
201 | ||
202 | for(i = 0; i < n; i++) { | |
203 | for (j = 0; j<=255; j++) { | |
204 | if (cmd[i]==j) { | |
205 | ToSendStuffBit(1); | |
206 | ToSendStuffBit(0); | |
207 | } else { | |
208 | ToSendStuffBit(1); | |
209 | ToSendStuffBit(1); | |
210 | } | |
211 | } | |
212 | } | |
213 | // EOF | |
214 | ToSendStuffBit(1); | |
215 | ToSendStuffBit(1); | |
216 | ToSendStuffBit(0); | |
217 | ToSendStuffBit(1); | |
218 | ||
219 | // Fill remainder of last byte with 1 | |
220 | for(i = 0; i < 4; i++) { | |
221 | ToSendStuffBit(1); | |
222 | } | |
223 | ||
224 | ToSendMax++; | |
225 | } | |
226 | ||
227 | ||
228 | static void CodeIso15693AsTag(uint8_t *cmd, int n) | |
229 | { | |
230 | ToSendReset(); | |
231 | ||
232 | // SOF | |
233 | ToSendStuffBit(0); | |
234 | ToSendStuffBit(0); | |
235 | ToSendStuffBit(0); | |
236 | ToSendStuffBit(1); | |
237 | ToSendStuffBit(1); | |
238 | ToSendStuffBit(1); | |
239 | ToSendStuffBit(0); | |
240 | ToSendStuffBit(1); | |
241 | ||
242 | // data | |
243 | for(int i = 0; i < n; i++) { | |
244 | for(int j = 0; j < 8; j++) { | |
245 | if ((cmd[i] >> j) & 0x01) { | |
246 | ToSendStuffBit(0); | |
247 | ToSendStuffBit(1); | |
248 | } else { | |
249 | ToSendStuffBit(1); | |
250 | ToSendStuffBit(0); | |
251 | } | |
252 | } | |
253 | } | |
254 | ||
255 | // EOF | |
256 | ToSendStuffBit(1); | |
257 | ToSendStuffBit(0); | |
258 | ToSendStuffBit(1); | |
259 | ToSendStuffBit(1); | |
260 | ToSendStuffBit(1); | |
261 | ToSendStuffBit(0); | |
262 | ToSendStuffBit(0); | |
263 | ToSendStuffBit(0); | |
264 | ||
265 | ToSendMax++; | |
266 | } | |
267 | ||
268 | ||
269 | // Transmit the command (to the tag) that was placed in cmd[]. | |
270 | static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time) | |
271 | { | |
272 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX); | |
273 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); | |
274 | ||
275 | while (GetCountSspClk() < start_time); | |
276 | ||
277 | LED_B_ON(); | |
278 | for(int c = 0; c < len; ) { | |
279 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { | |
280 | AT91C_BASE_SSC->SSC_THR = ~cmd[c]; | |
281 | c++; | |
282 | } | |
283 | WDT_HIT(); | |
284 | } | |
285 | LED_B_OFF(); | |
286 | } | |
287 | ||
288 | //----------------------------------------------------------------------------- | |
289 | // Transmit the tag response (to the reader) that was placed in cmd[]. | |
290 | //----------------------------------------------------------------------------- | |
291 | static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, bool slow) | |
292 | { | |
293 | // don't use the FPGA_HF_SIMULATOR_MODULATE_424K_8BIT minor mode. It would spoil GetCountSspClk() | |
294 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K); | |
295 | ||
296 | uint8_t shift_delay = start_time & 0x00000007; | |
297 | uint8_t bitmask = 0x00; | |
298 | for (int i = 0; i < shift_delay; i++) { | |
299 | bitmask |= (0x01 << i); | |
300 | } | |
301 | ||
302 | while (GetCountSspClk() < (start_time & 0xfffffff8)) ; | |
303 | ||
304 | AT91C_BASE_SSC->SSC_THR = 0x00; // clear TXRDY | |
305 | ||
306 | LED_C_ON(); | |
307 | uint8_t bits_to_shift = 0x00; | |
308 | for(size_t c = 0; c <= len; c++) { | |
309 | uint8_t bits_to_send = bits_to_shift << (8 - shift_delay) | (c==len?0x00:cmd[c]) >> shift_delay; | |
310 | bits_to_shift = cmd[c] & bitmask; | |
311 | for (int i = 7; i >= 0; i--) { | |
312 | for (int j = 0; j < (slow?4:1); ) { | |
313 | if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { | |
314 | if (bits_to_send >> i & 0x01) { | |
315 | AT91C_BASE_SSC->SSC_THR = 0xff; | |
316 | } else { | |
317 | AT91C_BASE_SSC->SSC_THR = 0x00; | |
318 | } | |
319 | j++; | |
320 | } | |
321 | WDT_HIT(); | |
322 | } | |
323 | } | |
324 | } | |
325 | LED_C_OFF(); | |
326 | } | |
327 | ||
328 | ||
329 | //============================================================================= | |
330 | // An ISO 15693 decoder for tag responses (one subcarrier only). | |
331 | // Uses cross correlation to identify each bit and EOF. | |
332 | // This function is called 8 times per bit (every 2 subcarrier cycles). | |
333 | // Subcarrier frequency fs is 424kHz, 1/fs = 2,36us, | |
334 | // i.e. function is called every 4,72us | |
335 | // LED handling: | |
336 | // LED C -> ON once we have received the SOF and are expecting the rest. | |
337 | // LED C -> OFF once we have received EOF or are unsynced | |
338 | // | |
339 | // Returns: true if we received a EOF | |
340 | // false if we are still waiting for some more | |
341 | //============================================================================= | |
342 | ||
343 | #define NOISE_THRESHOLD 160 // don't try to correlate noise | |
344 | ||
345 | typedef struct DecodeTag { | |
346 | enum { | |
347 | STATE_TAG_SOF_LOW, | |
348 | STATE_TAG_SOF_HIGH, | |
349 | STATE_TAG_SOF_HIGH_END, | |
350 | STATE_TAG_RECEIVING_DATA, | |
351 | STATE_TAG_EOF | |
352 | } state; | |
353 | int bitCount; | |
354 | int posCount; | |
355 | enum { | |
356 | LOGIC0, | |
357 | LOGIC1, | |
358 | SOF_PART1, | |
359 | SOF_PART2 | |
360 | } lastBit; | |
361 | uint16_t shiftReg; | |
362 | uint16_t max_len; | |
363 | uint8_t *output; | |
364 | int len; | |
365 | int sum1, sum2; | |
366 | } DecodeTag_t; | |
367 | ||
368 | ||
369 | static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag) | |
370 | { | |
371 | switch(DecodeTag->state) { | |
372 | case STATE_TAG_SOF_LOW: | |
373 | // waiting for 12 times low (11 times low is accepted as well) | |
374 | if (amplitude < NOISE_THRESHOLD) { | |
375 | DecodeTag->posCount++; | |
376 | } else { | |
377 | if (DecodeTag->posCount > 10) { | |
378 | DecodeTag->posCount = 1; | |
379 | DecodeTag->sum1 = 0; | |
380 | DecodeTag->state = STATE_TAG_SOF_HIGH; | |
381 | } else { | |
382 | DecodeTag->posCount = 0; | |
383 | } | |
384 | } | |
385 | break; | |
386 | ||
387 | case STATE_TAG_SOF_HIGH: | |
388 | // waiting for 10 times high. Take average over the last 8 | |
389 | if (amplitude > NOISE_THRESHOLD) { | |
390 | DecodeTag->posCount++; | |
391 | if (DecodeTag->posCount > 2) { | |
392 | DecodeTag->sum1 += amplitude; // keep track of average high value | |
393 | } | |
394 | if (DecodeTag->posCount == 10) { | |
395 | DecodeTag->sum1 >>= 4; // calculate half of average high value (8 samples) | |
396 | DecodeTag->state = STATE_TAG_SOF_HIGH_END; | |
397 | } | |
398 | } else { // high phase was too short | |
399 | DecodeTag->posCount = 1; | |
400 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
401 | } | |
402 | break; | |
403 | ||
404 | case STATE_TAG_SOF_HIGH_END: | |
405 | // waiting for a falling edge | |
406 | if (amplitude < DecodeTag->sum1) { // signal drops below 50% average high: a falling edge | |
407 | DecodeTag->lastBit = SOF_PART1; // detected 1st part of SOF (12 samples low and 12 samples high) | |
408 | DecodeTag->shiftReg = 0; | |
409 | DecodeTag->bitCount = 0; | |
410 | DecodeTag->len = 0; | |
411 | DecodeTag->sum1 = amplitude; | |
412 | DecodeTag->sum2 = 0; | |
413 | DecodeTag->posCount = 2; | |
414 | DecodeTag->state = STATE_TAG_RECEIVING_DATA; | |
415 | LED_C_ON(); | |
416 | } else { | |
417 | DecodeTag->posCount++; | |
418 | if (DecodeTag->posCount > 13) { // high phase too long | |
419 | DecodeTag->posCount = 0; | |
420 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
421 | LED_C_OFF(); | |
422 | } | |
423 | } | |
424 | break; | |
425 | ||
426 | case STATE_TAG_RECEIVING_DATA: | |
427 | if (DecodeTag->posCount == 1) { | |
428 | DecodeTag->sum1 = 0; | |
429 | DecodeTag->sum2 = 0; | |
430 | } | |
431 | if (DecodeTag->posCount <= 4) { | |
432 | DecodeTag->sum1 += amplitude; | |
433 | } else { | |
434 | DecodeTag->sum2 += amplitude; | |
435 | } | |
436 | if (DecodeTag->posCount == 8) { | |
437 | int32_t corr_1 = DecodeTag->sum2 - DecodeTag->sum1; | |
438 | int32_t corr_0 = -corr_1; | |
439 | int32_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 2; | |
440 | if (corr_EOF > corr_0 && corr_EOF > corr_1) { | |
441 | if (DecodeTag->lastBit == LOGIC0) { // this was already part of EOF | |
442 | DecodeTag->state = STATE_TAG_EOF; | |
443 | } else { | |
444 | DecodeTag->posCount = 0; | |
445 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
446 | LED_C_OFF(); | |
447 | } | |
448 | } else if (corr_1 > corr_0) { | |
449 | // logic 1 | |
450 | if (DecodeTag->lastBit == SOF_PART1) { // still part of SOF | |
451 | DecodeTag->lastBit = SOF_PART2; // SOF completed | |
452 | } else { | |
453 | DecodeTag->lastBit = LOGIC1; | |
454 | DecodeTag->shiftReg >>= 1; | |
455 | DecodeTag->shiftReg |= 0x80; | |
456 | DecodeTag->bitCount++; | |
457 | if (DecodeTag->bitCount == 8) { | |
458 | DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; | |
459 | DecodeTag->len++; | |
460 | if (DecodeTag->len > DecodeTag->max_len) { | |
461 | // buffer overflow, give up | |
462 | DecodeTag->posCount = 0; | |
463 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
464 | LED_C_OFF(); | |
465 | } | |
466 | DecodeTag->bitCount = 0; | |
467 | DecodeTag->shiftReg = 0; | |
468 | } | |
469 | } | |
470 | } else { | |
471 | // logic 0 | |
472 | if (DecodeTag->lastBit == SOF_PART1) { // incomplete SOF | |
473 | DecodeTag->posCount = 0; | |
474 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
475 | LED_C_OFF(); | |
476 | } else { | |
477 | DecodeTag->lastBit = LOGIC0; | |
478 | DecodeTag->shiftReg >>= 1; | |
479 | DecodeTag->bitCount++; | |
480 | if (DecodeTag->bitCount == 8) { | |
481 | DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; | |
482 | DecodeTag->len++; | |
483 | if (DecodeTag->len > DecodeTag->max_len) { | |
484 | // buffer overflow, give up | |
485 | DecodeTag->posCount = 0; | |
486 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
487 | LED_C_OFF(); | |
488 | } | |
489 | DecodeTag->bitCount = 0; | |
490 | DecodeTag->shiftReg = 0; | |
491 | } | |
492 | } | |
493 | } | |
494 | DecodeTag->posCount = 0; | |
495 | } | |
496 | DecodeTag->posCount++; | |
497 | break; | |
498 | ||
499 | case STATE_TAG_EOF: | |
500 | if (DecodeTag->posCount == 1) { | |
501 | DecodeTag->sum1 = 0; | |
502 | DecodeTag->sum2 = 0; | |
503 | } | |
504 | if (DecodeTag->posCount <= 4) { | |
505 | DecodeTag->sum1 += amplitude; | |
506 | } else { | |
507 | DecodeTag->sum2 += amplitude; | |
508 | } | |
509 | if (DecodeTag->posCount == 8) { | |
510 | int32_t corr_1 = DecodeTag->sum2 - DecodeTag->sum1; | |
511 | int32_t corr_0 = -corr_1; | |
512 | int32_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 2; | |
513 | if (corr_EOF > corr_0 || corr_1 > corr_0) { | |
514 | DecodeTag->posCount = 0; | |
515 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
516 | LED_C_OFF(); | |
517 | } else { | |
518 | LED_C_OFF(); | |
519 | return true; | |
520 | } | |
521 | } | |
522 | DecodeTag->posCount++; | |
523 | break; | |
524 | ||
525 | } | |
526 | ||
527 | return false; | |
528 | } | |
529 | ||
530 | ||
531 | static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_len) | |
532 | { | |
533 | DecodeTag->posCount = 0; | |
534 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
535 | DecodeTag->output = data; | |
536 | DecodeTag->max_len = max_len; | |
537 | } | |
538 | ||
539 | ||
540 | static void DecodeTagReset(DecodeTag_t *DecodeTag) | |
541 | { | |
542 | DecodeTag->posCount = 0; | |
543 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
544 | } | |
545 | ||
546 | ||
547 | /* | |
548 | * Receive and decode the tag response, also log to tracebuffer | |
549 | */ | |
550 | static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int timeout) | |
551 | { | |
552 | int samples = 0; | |
553 | bool gotFrame = false; | |
554 | ||
555 | uint16_t *dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); | |
556 | ||
557 | // the Decoder data structure | |
558 | DecodeTag_t DecodeTag = { 0 }; | |
559 | DecodeTagInit(&DecodeTag, response, max_len); | |
560 | ||
561 | // wait for last transfer to complete | |
562 | while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); | |
563 | ||
564 | // And put the FPGA in the appropriate mode | |
565 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_AMPLITUDE); | |
566 | ||
567 | // Setup and start DMA. | |
568 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); | |
569 | FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
570 | uint16_t *upTo = dmaBuf; | |
571 | ||
572 | for(;;) { | |
573 | uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); | |
574 | ||
575 | if (behindBy == 0) continue; | |
576 | ||
577 | uint16_t tagdata = *upTo++; | |
578 | ||
579 | if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. | |
580 | upTo = dmaBuf; // start reading the circular buffer from the beginning | |
581 | if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { | |
582 | Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); | |
583 | break; | |
584 | } | |
585 | } | |
586 | if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. | |
587 | AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and | |
588 | AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers | |
589 | } | |
590 | ||
591 | samples++; | |
592 | ||
593 | if (Handle15693SamplesFromTag(tagdata, &DecodeTag)) { | |
594 | gotFrame = true; | |
595 | break; | |
596 | } | |
597 | ||
598 | if (samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) { | |
599 | DecodeTag.len = 0; | |
600 | break; | |
601 | } | |
602 | ||
603 | } | |
604 | ||
605 | FpgaDisableSscDma(); | |
606 | BigBuf_free(); | |
607 | ||
608 | if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", | |
609 | samples, gotFrame, DecodeTag.state, DecodeTag.len, DecodeTag.bitCount, DecodeTag.posCount); | |
610 | ||
611 | if (DecodeTag.len > 0) { | |
612 | LogTrace(DecodeTag.output, DecodeTag.len, 0, 0, NULL, false); | |
613 | } | |
614 | ||
615 | return DecodeTag.len; | |
616 | } | |
617 | ||
618 | ||
619 | //============================================================================= | |
620 | // An ISO15693 decoder for reader commands. | |
621 | // | |
622 | // This function is called 4 times per bit (every 2 subcarrier cycles). | |
623 | // Subcarrier frequency fs is 848kHz, 1/fs = 1,18us, i.e. function is called every 2,36us | |
624 | // LED handling: | |
625 | // LED B -> ON once we have received the SOF and are expecting the rest. | |
626 | // LED B -> OFF once we have received EOF or are in error state or unsynced | |
627 | // | |
628 | // Returns: true if we received a EOF | |
629 | // false if we are still waiting for some more | |
630 | //============================================================================= | |
631 | ||
632 | typedef struct DecodeReader { | |
633 | enum { | |
634 | STATE_READER_UNSYNCD, | |
635 | STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF, | |
636 | STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF, | |
637 | STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF, | |
638 | STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4, | |
639 | STATE_READER_RECEIVE_DATA_1_OUT_OF_4, | |
640 | STATE_READER_RECEIVE_DATA_1_OUT_OF_256 | |
641 | } state; | |
642 | enum { | |
643 | CODING_1_OUT_OF_4, | |
644 | CODING_1_OUT_OF_256 | |
645 | } Coding; | |
646 | uint8_t shiftReg; | |
647 | uint8_t bitCount; | |
648 | int byteCount; | |
649 | int byteCountMax; | |
650 | int posCount; | |
651 | int sum1, sum2; | |
652 | uint8_t *output; | |
653 | } DecodeReader_t; | |
654 | ||
655 | ||
656 | static void DecodeReaderInit(DecodeReader_t* DecodeReader, uint8_t *data, uint16_t max_len) | |
657 | { | |
658 | DecodeReader->output = data; | |
659 | DecodeReader->byteCountMax = max_len; | |
660 | DecodeReader->state = STATE_READER_UNSYNCD; | |
661 | DecodeReader->byteCount = 0; | |
662 | DecodeReader->bitCount = 0; | |
663 | DecodeReader->posCount = 1; | |
664 | DecodeReader->shiftReg = 0; | |
665 | } | |
666 | ||
667 | ||
668 | static void DecodeReaderReset(DecodeReader_t* DecodeReader) | |
669 | { | |
670 | DecodeReader->state = STATE_READER_UNSYNCD; | |
671 | } | |
672 | ||
673 | ||
674 | static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uint8_t bit, DecodeReader_t *restrict DecodeReader) | |
675 | { | |
676 | switch(DecodeReader->state) { | |
677 | case STATE_READER_UNSYNCD: | |
678 | if(!bit) { | |
679 | // we went low, so this could be the beginning of a SOF | |
680 | DecodeReader->posCount = 1; | |
681 | DecodeReader->state = STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF; | |
682 | } | |
683 | break; | |
684 | ||
685 | case STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF: | |
686 | DecodeReader->posCount++; | |
687 | if(bit) { // detected rising edge | |
688 | if(DecodeReader->posCount < 4) { // rising edge too early (nominally expected at 5) | |
689 | DecodeReaderReset(DecodeReader); | |
690 | } else { // SOF | |
691 | DecodeReader->state = STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF; | |
692 | } | |
693 | } else { | |
694 | if(DecodeReader->posCount > 5) { // stayed low for too long | |
695 | DecodeReaderReset(DecodeReader); | |
696 | } else { | |
697 | // do nothing, keep waiting | |
698 | } | |
699 | } | |
700 | break; | |
701 | ||
702 | case STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF: | |
703 | DecodeReader->posCount++; | |
704 | if(!bit) { // detected a falling edge | |
705 | if (DecodeReader->posCount < 20) { // falling edge too early (nominally expected at 21 earliest) | |
706 | DecodeReaderReset(DecodeReader); | |
707 | } else if (DecodeReader->posCount < 23) { // SOF for 1 out of 4 coding | |
708 | DecodeReader->Coding = CODING_1_OUT_OF_4; | |
709 | DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; | |
710 | } else if (DecodeReader->posCount < 28) { // falling edge too early (nominally expected at 29 latest) | |
711 | DecodeReaderReset(DecodeReader); | |
712 | } else { // SOF for 1 out of 4 coding | |
713 | DecodeReader->Coding = CODING_1_OUT_OF_256; | |
714 | DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; | |
715 | } | |
716 | } else { | |
717 | if(DecodeReader->posCount > 29) { // stayed high for too long | |
718 | DecodeReaderReset(DecodeReader); | |
719 | } else { | |
720 | // do nothing, keep waiting | |
721 | } | |
722 | } | |
723 | break; | |
724 | ||
725 | case STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF: | |
726 | DecodeReader->posCount++; | |
727 | if (bit) { // detected rising edge | |
728 | if (DecodeReader->Coding == CODING_1_OUT_OF_256) { | |
729 | if (DecodeReader->posCount < 32) { // rising edge too early (nominally expected at 33) | |
730 | DecodeReaderReset(DecodeReader); | |
731 | } else { | |
732 | DecodeReader->posCount = 1; | |
733 | DecodeReader->bitCount = 0; | |
734 | DecodeReader->byteCount = 0; | |
735 | DecodeReader->sum1 = 1; | |
736 | DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_256; | |
737 | LED_B_ON(); | |
738 | } | |
739 | } else { // CODING_1_OUT_OF_4 | |
740 | if (DecodeReader->posCount < 24) { // rising edge too early (nominally expected at 25) | |
741 | DecodeReaderReset(DecodeReader); | |
742 | } else { | |
743 | DecodeReader->state = STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4; | |
744 | } | |
745 | } | |
746 | } else { | |
747 | if (DecodeReader->Coding == CODING_1_OUT_OF_256) { | |
748 | if (DecodeReader->posCount > 34) { // signal stayed low for too long | |
749 | DecodeReaderReset(DecodeReader); | |
750 | } else { | |
751 | // do nothing, keep waiting | |
752 | } | |
753 | } else { // CODING_1_OUT_OF_4 | |
754 | if (DecodeReader->posCount > 26) { // signal stayed low for too long | |
755 | DecodeReaderReset(DecodeReader); | |
756 | } else { | |
757 | // do nothing, keep waiting | |
758 | } | |
759 | } | |
760 | } | |
761 | break; | |
762 | ||
763 | case STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4: | |
764 | DecodeReader->posCount++; | |
765 | if (bit) { | |
766 | if (DecodeReader->posCount == 33) { | |
767 | DecodeReader->posCount = 1; | |
768 | DecodeReader->bitCount = 0; | |
769 | DecodeReader->byteCount = 0; | |
770 | DecodeReader->sum1 = 1; | |
771 | DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_4; | |
772 | LED_B_ON(); | |
773 | } else { | |
774 | // do nothing, keep waiting | |
775 | } | |
776 | } else { // unexpected falling edge | |
777 | DecodeReaderReset(DecodeReader); | |
778 | } | |
779 | break; | |
780 | ||
781 | case STATE_READER_RECEIVE_DATA_1_OUT_OF_4: | |
782 | DecodeReader->posCount++; | |
783 | if (DecodeReader->posCount == 1) { | |
784 | DecodeReader->sum1 = bit; | |
785 | } else if (DecodeReader->posCount <= 4) { | |
786 | DecodeReader->sum1 += bit; | |
787 | } else if (DecodeReader->posCount == 5) { | |
788 | DecodeReader->sum2 = bit; | |
789 | } else { | |
790 | DecodeReader->sum2 += bit; | |
791 | } | |
792 | if (DecodeReader->posCount == 8) { | |
793 | DecodeReader->posCount = 0; | |
794 | int corr10 = DecodeReader->sum1 - DecodeReader->sum2; | |
795 | int corr01 = DecodeReader->sum2 - DecodeReader->sum1; | |
796 | int corr11 = (DecodeReader->sum1 + DecodeReader->sum2) / 2; | |
797 | if (corr01 > corr11 && corr01 > corr10) { // EOF | |
798 | LED_B_OFF(); // Finished receiving | |
799 | DecodeReaderReset(DecodeReader); | |
800 | if (DecodeReader->byteCount != 0) { | |
801 | return true; | |
802 | } | |
803 | } | |
804 | if (corr10 > corr11) { // detected a 2bit position | |
805 | DecodeReader->shiftReg >>= 2; | |
806 | DecodeReader->shiftReg |= (DecodeReader->bitCount << 6); | |
807 | } | |
808 | if (DecodeReader->bitCount == 15) { // we have a full byte | |
809 | DecodeReader->output[DecodeReader->byteCount++] = DecodeReader->shiftReg; | |
810 | if (DecodeReader->byteCount > DecodeReader->byteCountMax) { | |
811 | // buffer overflow, give up | |
812 | LED_B_OFF(); | |
813 | DecodeReaderReset(DecodeReader); | |
814 | } | |
815 | DecodeReader->bitCount = 0; | |
816 | DecodeReader->shiftReg = 0; | |
817 | } else { | |
818 | DecodeReader->bitCount++; | |
819 | } | |
820 | } | |
821 | break; | |
822 | ||
823 | case STATE_READER_RECEIVE_DATA_1_OUT_OF_256: | |
824 | DecodeReader->posCount++; | |
825 | if (DecodeReader->posCount == 1) { | |
826 | DecodeReader->sum1 = bit; | |
827 | } else if (DecodeReader->posCount <= 4) { | |
828 | DecodeReader->sum1 += bit; | |
829 | } else if (DecodeReader->posCount == 5) { | |
830 | DecodeReader->sum2 = bit; | |
831 | } else { | |
832 | DecodeReader->sum2 += bit; | |
833 | } | |
834 | if (DecodeReader->posCount == 8) { | |
835 | DecodeReader->posCount = 0; | |
836 | int corr10 = DecodeReader->sum1 - DecodeReader->sum2; | |
837 | int corr01 = DecodeReader->sum2 - DecodeReader->sum1; | |
838 | int corr11 = (DecodeReader->sum1 + DecodeReader->sum2) / 2; | |
839 | if (corr01 > corr11 && corr01 > corr10) { // EOF | |
840 | LED_B_OFF(); // Finished receiving | |
841 | DecodeReaderReset(DecodeReader); | |
842 | if (DecodeReader->byteCount != 0) { | |
843 | return true; | |
844 | } | |
845 | } | |
846 | if (corr10 > corr11) { // detected the bit position | |
847 | DecodeReader->shiftReg = DecodeReader->bitCount; | |
848 | } | |
849 | if (DecodeReader->bitCount == 255) { // we have a full byte | |
850 | DecodeReader->output[DecodeReader->byteCount++] = DecodeReader->shiftReg; | |
851 | if (DecodeReader->byteCount > DecodeReader->byteCountMax) { | |
852 | // buffer overflow, give up | |
853 | LED_B_OFF(); | |
854 | DecodeReaderReset(DecodeReader); | |
855 | } | |
856 | } | |
857 | DecodeReader->bitCount++; | |
858 | } | |
859 | break; | |
860 | ||
861 | default: | |
862 | LED_B_OFF(); | |
863 | DecodeReaderReset(DecodeReader); | |
864 | break; | |
865 | } | |
866 | ||
867 | return false; | |
868 | } | |
869 | ||
870 | ||
871 | //----------------------------------------------------------------------------- | |
872 | // Receive a command (from the reader to us, where we are the simulated tag), | |
873 | // and store it in the given buffer, up to the given maximum length. Keeps | |
874 | // spinning, waiting for a well-framed command, until either we get one | |
875 | // (returns true) or someone presses the pushbutton on the board (false). | |
876 | // | |
877 | // Assume that we're called with the SSC (to the FPGA) and ADC path set | |
878 | // correctly. | |
879 | //----------------------------------------------------------------------------- | |
880 | ||
881 | static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time) | |
882 | { | |
883 | int samples = 0; | |
884 | bool gotFrame = false; | |
885 | uint8_t b; | |
886 | ||
887 | uint8_t *dmaBuf = BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE); | |
888 | ||
889 | // the decoder data structure | |
890 | DecodeReader_t DecodeReader = {0}; | |
891 | DecodeReaderInit(&DecodeReader, received, max_len); | |
892 | ||
893 | // wait for last transfer to complete | |
894 | while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); | |
895 | ||
896 | LED_D_OFF(); | |
897 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); | |
898 | ||
899 | // clear receive register and wait for next transfer | |
900 | uint32_t temp = AT91C_BASE_SSC->SSC_RHR; | |
901 | (void) temp; | |
902 | while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) ; | |
903 | ||
904 | uint32_t bit_time = GetCountSspClk() & 0xfffffff8; | |
905 | ||
906 | // Setup and start DMA. | |
907 | FpgaSetupSscDma(dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
908 | uint8_t *upTo = dmaBuf; | |
909 | ||
910 | for(;;) { | |
911 | uint16_t behindBy = ((uint8_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); | |
912 | ||
913 | if (behindBy == 0) continue; | |
914 | ||
915 | b = *upTo++; | |
916 | if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. | |
917 | upTo = dmaBuf; // start reading the circular buffer from the beginning | |
918 | if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { | |
919 | Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); | |
920 | break; | |
921 | } | |
922 | } | |
923 | if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. | |
924 | AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and | |
925 | AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers | |
926 | } | |
927 | ||
928 | for (int i = 7; i >= 0; i--) { | |
929 | if (Handle15693SampleFromReader((b >> i) & 0x01, &DecodeReader)) { | |
930 | *eof_time = bit_time + samples - DELAY_READER_TO_ARM; // end of EOF | |
931 | gotFrame = true; | |
932 | break; | |
933 | } | |
934 | samples++; | |
935 | } | |
936 | ||
937 | if (gotFrame) { | |
938 | break; | |
939 | } | |
940 | ||
941 | if (BUTTON_PRESS()) { | |
942 | DecodeReader.byteCount = 0; | |
943 | break; | |
944 | } | |
945 | ||
946 | WDT_HIT(); | |
947 | } | |
948 | ||
949 | ||
950 | FpgaDisableSscDma(); | |
951 | BigBuf_free_keep_EM(); | |
952 | ||
953 | if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", | |
954 | samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount); | |
955 | ||
956 | if (DecodeReader.byteCount > 0) { | |
957 | LogTrace(DecodeReader.output, DecodeReader.byteCount, 0, 0, NULL, true); | |
958 | } | |
959 | ||
960 | return DecodeReader.byteCount; | |
961 | } | |
962 | ||
963 | ||
964 | // Encode (into the ToSend buffers) an identify request, which is the first | |
965 | // thing that you must send to a tag to get a response. | |
966 | static void BuildIdentifyRequest(void) | |
967 | { | |
968 | uint8_t cmd[5]; | |
969 | ||
970 | uint16_t crc; | |
971 | // one sub-carrier, inventory, 1 slot, fast rate | |
972 | // AFI is at bit 5 (1<<4) when doing an INVENTORY | |
973 | cmd[0] = (1 << 2) | (1 << 5) | (1 << 1); | |
974 | // inventory command code | |
975 | cmd[1] = 0x01; | |
976 | // no mask | |
977 | cmd[2] = 0x00; | |
978 | //Now the CRC | |
979 | crc = Crc(cmd, 3); | |
980 | cmd[3] = crc & 0xff; | |
981 | cmd[4] = crc >> 8; | |
982 | ||
983 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
984 | } | |
985 | ||
986 | ||
987 | //----------------------------------------------------------------------------- | |
988 | // Start to read an ISO 15693 tag. We send an identify request, then wait | |
989 | // for the response. The response is not demodulated, just left in the buffer | |
990 | // so that it can be downloaded to a PC and processed there. | |
991 | //----------------------------------------------------------------------------- | |
992 | void AcquireRawAdcSamplesIso15693(void) | |
993 | { | |
994 | LEDsoff(); | |
995 | LED_A_ON(); | |
996 | ||
997 | uint8_t *dest = BigBuf_get_addr(); | |
998 | ||
999 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); | |
1000 | BuildIdentifyRequest(); | |
1001 | ||
1002 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); | |
1003 | ||
1004 | // Give the tags time to energize | |
1005 | LED_D_ON(); | |
1006 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); | |
1007 | SpinDelay(100); | |
1008 | ||
1009 | // Now send the command | |
1010 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX); | |
1011 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); | |
1012 | ||
1013 | LED_B_ON(); | |
1014 | for(int c = 0; c < ToSendMax; ) { | |
1015 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { | |
1016 | AT91C_BASE_SSC->SSC_THR = ~ToSend[c]; | |
1017 | c++; | |
1018 | } | |
1019 | WDT_HIT(); | |
1020 | } | |
1021 | LED_B_OFF(); | |
1022 | ||
1023 | // wait for last transfer to complete | |
1024 | while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); | |
1025 | ||
1026 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); | |
1027 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_AMPLITUDE); | |
1028 | ||
1029 | for(int c = 0; c < 4000; ) { | |
1030 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { | |
1031 | uint16_t r = AT91C_BASE_SSC->SSC_RHR; | |
1032 | dest[c++] = r >> 5; | |
1033 | } | |
1034 | } | |
1035 | ||
1036 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1037 | LEDsoff(); | |
1038 | } | |
1039 | ||
1040 | ||
1041 | void SnoopIso15693(void) | |
1042 | { | |
1043 | LED_A_ON(); | |
1044 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); | |
1045 | BigBuf_free(); | |
1046 | ||
1047 | clear_trace(); | |
1048 | set_tracing(true); | |
1049 | ||
1050 | ||
1051 | // The DMA buffer, used to stream samples from the FPGA | |
1052 | uint16_t* dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); | |
1053 | uint16_t *upTo; | |
1054 | ||
1055 | // Count of samples received so far, so that we can include timing | |
1056 | // information in the trace buffer. | |
1057 | int samples = 0; | |
1058 | ||
1059 | DecodeTag_t DecodeTag = {0}; | |
1060 | uint8_t response[ISO15693_MAX_RESPONSE_LENGTH]; | |
1061 | DecodeTagInit(&DecodeTag, response, sizeof(response)); | |
1062 | ||
1063 | DecodeReader_t DecodeReader = {0};; | |
1064 | uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; | |
1065 | DecodeReaderInit(&DecodeReader, cmd, sizeof(cmd)); | |
1066 | ||
1067 | // Print some debug information about the buffer sizes | |
1068 | if (DEBUG) { | |
1069 | Dbprintf("Snooping buffers initialized:"); | |
1070 | Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen()); | |
1071 | Dbprintf(" Reader -> tag: %i bytes", ISO15693_MAX_COMMAND_LENGTH); | |
1072 | Dbprintf(" tag -> Reader: %i bytes", ISO15693_MAX_RESPONSE_LENGTH); | |
1073 | Dbprintf(" DMA: %i bytes", ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t)); | |
1074 | } | |
1075 | Dbprintf("Snoop started. Press button to stop."); | |
1076 | ||
1077 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_SNOOP | FPGA_HF_READER_RX_XCORR_AMPLITUDE); | |
1078 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); | |
1079 | ||
1080 | // Setup for the DMA. | |
1081 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); | |
1082 | upTo = dmaBuf; | |
1083 | FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
1084 | ||
1085 | bool TagIsActive = false; | |
1086 | bool ReaderIsActive = false; | |
1087 | bool ExpectTagAnswer = false; | |
1088 | ||
1089 | // And now we loop, receiving samples. | |
1090 | for(;;) { | |
1091 | uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); | |
1092 | ||
1093 | if (behindBy == 0) continue; | |
1094 | ||
1095 | uint16_t snoopdata = *upTo++; | |
1096 | ||
1097 | if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. | |
1098 | upTo = dmaBuf; // start reading the circular buffer from the beginning | |
1099 | if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { | |
1100 | Dbprintf("About to blow circular buffer - aborted! behindBy=%d, samples=%d", behindBy, samples); | |
1101 | break; | |
1102 | } | |
1103 | if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. | |
1104 | AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and | |
1105 | AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers | |
1106 | WDT_HIT(); | |
1107 | if(BUTTON_PRESS()) { | |
1108 | DbpString("Snoop stopped."); | |
1109 | break; | |
1110 | } | |
1111 | } | |
1112 | } | |
1113 | samples++; | |
1114 | ||
1115 | if (!TagIsActive) { // no need to try decoding reader data if the tag is sending | |
1116 | if (Handle15693SampleFromReader(snoopdata & 0x02, &DecodeReader)) { | |
1117 | FpgaDisableSscDma(); | |
1118 | ExpectTagAnswer = true; | |
1119 | LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); | |
1120 | /* And ready to receive another command. */ | |
1121 | DecodeReaderReset(&DecodeReader); | |
1122 | /* And also reset the demod code, which might have been */ | |
1123 | /* false-triggered by the commands from the reader. */ | |
1124 | DecodeTagReset(&DecodeTag); | |
1125 | upTo = dmaBuf; | |
1126 | FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
1127 | } | |
1128 | if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) { | |
1129 | FpgaDisableSscDma(); | |
1130 | ExpectTagAnswer = true; | |
1131 | LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); | |
1132 | /* And ready to receive another command. */ | |
1133 | DecodeReaderReset(&DecodeReader); | |
1134 | /* And also reset the demod code, which might have been */ | |
1135 | /* false-triggered by the commands from the reader. */ | |
1136 | DecodeTagReset(&DecodeTag); | |
1137 | upTo = dmaBuf; | |
1138 | FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
1139 | } | |
1140 | ReaderIsActive = (DecodeReader.state >= STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF); | |
1141 | } | |
1142 | ||
1143 | if (!ReaderIsActive && ExpectTagAnswer) { // no need to try decoding tag data if the reader is currently sending or no answer expected yet | |
1144 | if (Handle15693SamplesFromTag(snoopdata >> 2, &DecodeTag)) { | |
1145 | FpgaDisableSscDma(); | |
1146 | //Use samples as a time measurement | |
1147 | LogTrace(DecodeTag.output, DecodeTag.len, samples, samples, NULL, false); | |
1148 | // And ready to receive another response. | |
1149 | DecodeTagReset(&DecodeTag); | |
1150 | DecodeReaderReset(&DecodeReader); | |
1151 | ExpectTagAnswer = false; | |
1152 | upTo = dmaBuf; | |
1153 | FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
1154 | } | |
1155 | TagIsActive = (DecodeTag.state >= STATE_TAG_RECEIVING_DATA); | |
1156 | } | |
1157 | ||
1158 | } | |
1159 | ||
1160 | FpgaDisableSscDma(); | |
1161 | BigBuf_free(); | |
1162 | ||
1163 | LEDsoff(); | |
1164 | ||
1165 | DbpString("Snoop statistics:"); | |
1166 | Dbprintf(" ExpectTagAnswer: %d", ExpectTagAnswer); | |
1167 | Dbprintf(" DecodeTag State: %d", DecodeTag.state); | |
1168 | Dbprintf(" DecodeTag byteCnt: %d", DecodeTag.len); | |
1169 | Dbprintf(" DecodeReader State: %d", DecodeReader.state); | |
1170 | Dbprintf(" DecodeReader byteCnt: %d", DecodeReader.byteCount); | |
1171 | Dbprintf(" Trace length: %d", BigBuf_get_traceLen()); | |
1172 | } | |
1173 | ||
1174 | ||
1175 | // Initialize the proxmark as iso15k reader | |
1176 | // (this might produces glitches that confuse some tags | |
1177 | static void Iso15693InitReader() { | |
1178 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); | |
1179 | // Setup SSC | |
1180 | // FpgaSetupSsc(); | |
1181 | ||
1182 | // Start from off (no field generated) | |
1183 | LED_D_OFF(); | |
1184 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1185 | SpinDelay(10); | |
1186 | ||
1187 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); | |
1188 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); | |
1189 | ||
1190 | // Give the tags time to energize | |
1191 | LED_D_ON(); | |
1192 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); | |
1193 | SpinDelay(250); | |
1194 | } | |
1195 | ||
1196 | /////////////////////////////////////////////////////////////////////// | |
1197 | // ISO 15693 Part 3 - Air Interface | |
1198 | // This section basically contains transmission and receiving of bits | |
1199 | /////////////////////////////////////////////////////////////////////// | |
1200 | ||
1201 | ||
1202 | // uid is in transmission order (which is reverse of display order) | |
1203 | static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) | |
1204 | { | |
1205 | uint8_t cmd[13]; | |
1206 | ||
1207 | uint16_t crc; | |
1208 | // If we set the Option_Flag in this request, the VICC will respond with the security status of the block | |
1209 | // followed by the block data | |
1210 | cmd[0] = ISO15693_REQ_OPTION | ISO15693_REQ_ADDRESS | ISO15693_REQ_DATARATE_HIGH; | |
1211 | // READ BLOCK command code | |
1212 | cmd[1] = ISO15693_READBLOCK; | |
1213 | // UID may be optionally specified here | |
1214 | // 64-bit UID | |
1215 | cmd[2] = uid[0]; | |
1216 | cmd[3] = uid[1]; | |
1217 | cmd[4] = uid[2]; | |
1218 | cmd[5] = uid[3]; | |
1219 | cmd[6] = uid[4]; | |
1220 | cmd[7] = uid[5]; | |
1221 | cmd[8] = uid[6]; | |
1222 | cmd[9] = uid[7]; // 0xe0; // always e0 (not exactly unique) | |
1223 | // Block number to read | |
1224 | cmd[10] = blockNumber; | |
1225 | //Now the CRC | |
1226 | crc = Crc(cmd, 11); // the crc needs to be calculated over 11 bytes | |
1227 | cmd[11] = crc & 0xff; | |
1228 | cmd[12] = crc >> 8; | |
1229 | ||
1230 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1231 | } | |
1232 | ||
1233 | ||
1234 | // Now the VICC>VCD responses when we are simulating a tag | |
1235 | static void BuildInventoryResponse(uint8_t *uid) | |
1236 | { | |
1237 | uint8_t cmd[12]; | |
1238 | ||
1239 | uint16_t crc; | |
1240 | ||
1241 | cmd[0] = 0; // No error, no protocol format extension | |
1242 | cmd[1] = 0; // DSFID (data storage format identifier). 0x00 = not supported | |
1243 | // 64-bit UID | |
1244 | cmd[2] = uid[7]; //0x32; | |
1245 | cmd[3] = uid[6]; //0x4b; | |
1246 | cmd[4] = uid[5]; //0x03; | |
1247 | cmd[5] = uid[4]; //0x01; | |
1248 | cmd[6] = uid[3]; //0x00; | |
1249 | cmd[7] = uid[2]; //0x10; | |
1250 | cmd[8] = uid[1]; //0x05; | |
1251 | cmd[9] = uid[0]; //0xe0; | |
1252 | //Now the CRC | |
1253 | crc = Crc(cmd, 10); | |
1254 | cmd[10] = crc & 0xff; | |
1255 | cmd[11] = crc >> 8; | |
1256 | ||
1257 | CodeIso15693AsTag(cmd, sizeof(cmd)); | |
1258 | } | |
1259 | ||
1260 | // Universal Method for sending to and recv bytes from a tag | |
1261 | // init ... should we initialize the reader? | |
1262 | // speed ... 0 low speed, 1 hi speed | |
1263 | // *recv will contain the tag's answer | |
1264 | // return: lenght of received data | |
1265 | int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t *recv, uint16_t max_recv_len, uint32_t start_time) { | |
1266 | ||
1267 | LED_A_ON(); | |
1268 | LED_B_OFF(); | |
1269 | LED_C_OFF(); | |
1270 | ||
1271 | if (init) Iso15693InitReader(); | |
1272 | ||
1273 | int answerLen=0; | |
1274 | ||
1275 | if (!speed) { | |
1276 | // low speed (1 out of 256) | |
1277 | CodeIso15693AsReader256(send, sendlen); | |
1278 | } else { | |
1279 | // high speed (1 out of 4) | |
1280 | CodeIso15693AsReader(send, sendlen); | |
1281 | } | |
1282 | ||
1283 | TransmitTo15693Tag(ToSend, ToSendMax, start_time); | |
1284 | ||
1285 | // Now wait for a response | |
1286 | if (recv != NULL) { | |
1287 | answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, DELAY_ISO15693_VCD_TO_VICC * 2); | |
1288 | } | |
1289 | ||
1290 | LED_A_OFF(); | |
1291 | ||
1292 | return answerLen; | |
1293 | } | |
1294 | ||
1295 | ||
1296 | // -------------------------------------------------------------------- | |
1297 | // Debug Functions | |
1298 | // -------------------------------------------------------------------- | |
1299 | ||
1300 | // Decodes a message from a tag and displays its metadata and content | |
1301 | #define DBD15STATLEN 48 | |
1302 | void DbdecodeIso15693Answer(int len, uint8_t *d) { | |
1303 | char status[DBD15STATLEN+1]={0}; | |
1304 | uint16_t crc; | |
1305 | ||
1306 | if (len > 3) { | |
1307 | if (d[0] & ISO15693_RES_EXT) | |
1308 | strncat(status,"ProtExt ", DBD15STATLEN); | |
1309 | if (d[0] & ISO15693_RES_ERROR) { | |
1310 | // error | |
1311 | strncat(status,"Error ", DBD15STATLEN); | |
1312 | switch (d[1]) { | |
1313 | case 0x01: | |
1314 | strncat(status,"01:notSupp", DBD15STATLEN); | |
1315 | break; | |
1316 | case 0x02: | |
1317 | strncat(status,"02:notRecog", DBD15STATLEN); | |
1318 | break; | |
1319 | case 0x03: | |
1320 | strncat(status,"03:optNotSupp", DBD15STATLEN); | |
1321 | break; | |
1322 | case 0x0f: | |
1323 | strncat(status,"0f:noInfo", DBD15STATLEN); | |
1324 | break; | |
1325 | case 0x10: | |
1326 | strncat(status,"10:doesn'tExist", DBD15STATLEN); | |
1327 | break; | |
1328 | case 0x11: | |
1329 | strncat(status,"11:lockAgain", DBD15STATLEN); | |
1330 | break; | |
1331 | case 0x12: | |
1332 | strncat(status,"12:locked", DBD15STATLEN); | |
1333 | break; | |
1334 | case 0x13: | |
1335 | strncat(status,"13:progErr", DBD15STATLEN); | |
1336 | break; | |
1337 | case 0x14: | |
1338 | strncat(status,"14:lockErr", DBD15STATLEN); | |
1339 | break; | |
1340 | default: | |
1341 | strncat(status,"unknownErr", DBD15STATLEN); | |
1342 | } | |
1343 | strncat(status," ", DBD15STATLEN); | |
1344 | } else { | |
1345 | strncat(status,"NoErr ", DBD15STATLEN); | |
1346 | } | |
1347 | ||
1348 | crc=Crc(d,len-2); | |
1349 | if ( (( crc & 0xff ) == d[len-2]) && (( crc >> 8 ) == d[len-1]) ) | |
1350 | strncat(status,"CrcOK",DBD15STATLEN); | |
1351 | else | |
1352 | strncat(status,"CrcFail!",DBD15STATLEN); | |
1353 | ||
1354 | Dbprintf("%s",status); | |
1355 | } | |
1356 | } | |
1357 | ||
1358 | ||
1359 | ||
1360 | /////////////////////////////////////////////////////////////////////// | |
1361 | // Functions called via USB/Client | |
1362 | /////////////////////////////////////////////////////////////////////// | |
1363 | ||
1364 | void SetDebugIso15693(uint32_t debug) { | |
1365 | DEBUG=debug; | |
1366 | Dbprintf("Iso15693 Debug is now %s",DEBUG?"on":"off"); | |
1367 | return; | |
1368 | } | |
1369 | ||
1370 | ||
1371 | //----------------------------------------------------------------------------- | |
1372 | // Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector | |
1373 | // all demodulation performed in arm rather than host. - greg | |
1374 | //----------------------------------------------------------------------------- | |
1375 | void ReaderIso15693(uint32_t parameter) | |
1376 | { | |
1377 | LEDsoff(); | |
1378 | LED_A_ON(); | |
1379 | ||
1380 | set_tracing(true); | |
1381 | ||
1382 | int answerLen = 0; | |
1383 | uint8_t TagUID[8] = {0x00}; | |
1384 | ||
1385 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); | |
1386 | ||
1387 | uint8_t answer[ISO15693_MAX_RESPONSE_LENGTH]; | |
1388 | ||
1389 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); | |
1390 | // Setup SSC | |
1391 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); | |
1392 | ||
1393 | // Start from off (no field generated) | |
1394 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1395 | SpinDelay(200); | |
1396 | ||
1397 | // Give the tags time to energize | |
1398 | LED_D_ON(); | |
1399 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); | |
1400 | SpinDelay(200); | |
1401 | StartCountSspClk(); | |
1402 | ||
1403 | ||
1404 | // FIRST WE RUN AN INVENTORY TO GET THE TAG UID | |
1405 | // THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME | |
1406 | ||
1407 | // Now send the IDENTIFY command | |
1408 | BuildIdentifyRequest(); | |
1409 | TransmitTo15693Tag(ToSend, ToSendMax, 0); | |
1410 | ||
1411 | // Now wait for a response | |
1412 | answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC * 2) ; | |
1413 | uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD; | |
1414 | ||
1415 | if (answerLen >=12) // we should do a better check than this | |
1416 | { | |
1417 | TagUID[0] = answer[2]; | |
1418 | TagUID[1] = answer[3]; | |
1419 | TagUID[2] = answer[4]; | |
1420 | TagUID[3] = answer[5]; | |
1421 | TagUID[4] = answer[6]; | |
1422 | TagUID[5] = answer[7]; | |
1423 | TagUID[6] = answer[8]; // IC Manufacturer code | |
1424 | TagUID[7] = answer[9]; // always E0 | |
1425 | ||
1426 | } | |
1427 | ||
1428 | Dbprintf("%d octets read from IDENTIFY request:", answerLen); | |
1429 | DbdecodeIso15693Answer(answerLen, answer); | |
1430 | Dbhexdump(answerLen, answer, false); | |
1431 | ||
1432 | // UID is reverse | |
1433 | if (answerLen >= 12) | |
1434 | Dbprintf("UID = %02hX%02hX%02hX%02hX%02hX%02hX%02hX%02hX", | |
1435 | TagUID[7],TagUID[6],TagUID[5],TagUID[4], | |
1436 | TagUID[3],TagUID[2],TagUID[1],TagUID[0]); | |
1437 | ||
1438 | ||
1439 | // Dbprintf("%d octets read from SELECT request:", answerLen2); | |
1440 | // DbdecodeIso15693Answer(answerLen2,answer2); | |
1441 | // Dbhexdump(answerLen2,answer2,true); | |
1442 | ||
1443 | // Dbprintf("%d octets read from XXX request:", answerLen3); | |
1444 | // DbdecodeIso15693Answer(answerLen3,answer3); | |
1445 | // Dbhexdump(answerLen3,answer3,true); | |
1446 | ||
1447 | // read all pages | |
1448 | if (answerLen >= 12 && DEBUG) { | |
1449 | ||
1450 | // debugptr = BigBuf_get_addr(); | |
1451 | ||
1452 | int i = 0; | |
1453 | while (i < 32) { // sanity check, assume max 32 pages | |
1454 | BuildReadBlockRequest(TagUID, i); | |
1455 | TransmitTo15693Tag(ToSend, ToSendMax, start_time); | |
1456 | int answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC * 2); | |
1457 | start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD; | |
1458 | if (answerLen > 0) { | |
1459 | Dbprintf("READ SINGLE BLOCK %d returned %d octets:", i, answerLen); | |
1460 | DbdecodeIso15693Answer(answerLen, answer); | |
1461 | Dbhexdump(answerLen, answer, false); | |
1462 | if ( *((uint32_t*) answer) == 0x07160101 ) break; // exit on NoPageErr | |
1463 | } | |
1464 | i++; | |
1465 | } | |
1466 | } | |
1467 | ||
1468 | // for the time being, switch field off to protect rdv4.0 | |
1469 | // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway | |
1470 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1471 | LED_D_OFF(); | |
1472 | ||
1473 | LED_A_OFF(); | |
1474 | } | |
1475 | ||
1476 | ||
1477 | // Simulate an ISO15693 TAG. | |
1478 | // For Inventory command: print command and send Inventory Response with given UID | |
1479 | // TODO: interpret other reader commands and send appropriate response | |
1480 | void SimTagIso15693(uint32_t parameter, uint8_t *uid) | |
1481 | { | |
1482 | LEDsoff(); | |
1483 | LED_A_ON(); | |
1484 | ||
1485 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); | |
1486 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); | |
1487 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); | |
1488 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR); | |
1489 | ||
1490 | StartCountSspClk(); | |
1491 | ||
1492 | uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; | |
1493 | ||
1494 | // Build a suitable response to the reader INVENTORY command | |
1495 | BuildInventoryResponse(uid); | |
1496 | ||
1497 | // Listen to reader | |
1498 | while (!BUTTON_PRESS()) { | |
1499 | uint32_t eof_time = 0, start_time = 0; | |
1500 | int cmd_len = GetIso15693CommandFromReader(cmd, sizeof(cmd), &eof_time); | |
1501 | ||
1502 | if ((cmd_len >= 5) && (cmd[0] & ISO15693_REQ_INVENTORY) && (cmd[1] == ISO15693_INVENTORY)) { // TODO: check more flags | |
1503 | bool slow = !(cmd[0] & ISO15693_REQ_DATARATE_HIGH); | |
1504 | start_time = eof_time + DELAY_ISO15693_VCD_TO_VICC - DELAY_ARM_TO_READER; | |
1505 | TransmitTo15693Reader(ToSend, ToSendMax, start_time, slow); | |
1506 | } | |
1507 | ||
1508 | Dbprintf("%d bytes read from reader:", cmd_len); | |
1509 | Dbhexdump(cmd_len, cmd, false); | |
1510 | } | |
1511 | ||
1512 | LEDsoff(); | |
1513 | } | |
1514 | ||
1515 | ||
1516 | // Since there is no standardized way of reading the AFI out of a tag, we will brute force it | |
1517 | // (some manufactures offer a way to read the AFI, though) | |
1518 | void BruteforceIso15693Afi(uint32_t speed) | |
1519 | { | |
1520 | LEDsoff(); | |
1521 | LED_A_ON(); | |
1522 | ||
1523 | uint8_t data[6]; | |
1524 | uint8_t recv[ISO15693_MAX_RESPONSE_LENGTH]; | |
1525 | ||
1526 | int datalen=0, recvlen=0; | |
1527 | ||
1528 | Iso15693InitReader(); | |
1529 | StartCountSspClk(); | |
1530 | ||
1531 | // first without AFI | |
1532 | // Tags should respond without AFI and with AFI=0 even when AFI is active | |
1533 | ||
1534 | data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_SLOT1; | |
1535 | data[1] = ISO15693_INVENTORY; | |
1536 | data[2] = 0; // mask length | |
1537 | datalen = AddCrc(data,3); | |
1538 | recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), 0); | |
1539 | uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VCD_TO_VICC; | |
1540 | WDT_HIT(); | |
1541 | if (recvlen>=12) { | |
1542 | Dbprintf("NoAFI UID=%s", sprintUID(NULL, &recv[2])); | |
1543 | } | |
1544 | ||
1545 | // now with AFI | |
1546 | ||
1547 | data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_AFI | ISO15693_REQINV_SLOT1; | |
1548 | data[1] = ISO15693_INVENTORY; | |
1549 | data[2] = 0; // AFI | |
1550 | data[3] = 0; // mask length | |
1551 | ||
1552 | for (int i = 0; i < 256; i++) { | |
1553 | data[2] = i & 0xFF; | |
1554 | datalen = AddCrc(data,4); | |
1555 | recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time); | |
1556 | start_time = GetCountSspClk() + DELAY_ISO15693_VCD_TO_VICC; | |
1557 | WDT_HIT(); | |
1558 | if (recvlen >= 12) { | |
1559 | Dbprintf("AFI=%i UID=%s", i, sprintUID(NULL, &recv[2])); | |
1560 | } | |
1561 | } | |
1562 | Dbprintf("AFI Bruteforcing done."); | |
1563 | ||
1564 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1565 | LEDsoff(); | |
1566 | } | |
1567 | ||
1568 | // Allows to directly send commands to the tag via the client | |
1569 | void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint8_t data[]) { | |
1570 | ||
1571 | int recvlen = 0; | |
1572 | uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; | |
1573 | ||
1574 | LED_A_ON(); | |
1575 | ||
1576 | if (DEBUG) { | |
1577 | Dbprintf("SEND:"); | |
1578 | Dbhexdump(datalen, data, false); | |
1579 | } | |
1580 | ||
1581 | recvlen = SendDataTag(data, datalen, true, speed, (recv?recvbuf:NULL), sizeof(recvbuf), 0); | |
1582 | ||
1583 | if (recv) { | |
1584 | if (DEBUG) { | |
1585 | Dbprintf("RECV:"); | |
1586 | Dbhexdump(recvlen, recvbuf, false); | |
1587 | DbdecodeIso15693Answer(recvlen, recvbuf); | |
1588 | } | |
1589 | ||
1590 | cmd_send(CMD_ACK, recvlen>ISO15693_MAX_RESPONSE_LENGTH?ISO15693_MAX_RESPONSE_LENGTH:recvlen, 0, 0, recvbuf, ISO15693_MAX_RESPONSE_LENGTH); | |
1591 | ||
1592 | } | |
1593 | ||
1594 | // for the time being, switch field off to protect rdv4.0 | |
1595 | // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway | |
1596 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1597 | LED_D_OFF(); | |
1598 | ||
1599 | LED_A_OFF(); | |
1600 | } | |
1601 | ||
1602 | ||
1603 | ||
1604 | ||
1605 | // -------------------------------------------------------------------- | |
1606 | // -- Misc & deprecated functions | |
1607 | // -------------------------------------------------------------------- | |
1608 | ||
1609 | /* | |
1610 | ||
1611 | // do not use; has a fix UID | |
1612 | static void __attribute__((unused)) BuildSysInfoRequest(uint8_t *uid) | |
1613 | { | |
1614 | uint8_t cmd[12]; | |
1615 | ||
1616 | uint16_t crc; | |
1617 | // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block | |
1618 | // followed by teh block data | |
1619 | // one sub-carrier, inventory, 1 slot, fast rate | |
1620 | cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit | |
1621 | // System Information command code | |
1622 | cmd[1] = 0x2B; | |
1623 | // UID may be optionally specified here | |
1624 | // 64-bit UID | |
1625 | cmd[2] = 0x32; | |
1626 | cmd[3]= 0x4b; | |
1627 | cmd[4] = 0x03; | |
1628 | cmd[5] = 0x01; | |
1629 | cmd[6] = 0x00; | |
1630 | cmd[7] = 0x10; | |
1631 | cmd[8] = 0x05; | |
1632 | cmd[9]= 0xe0; // always e0 (not exactly unique) | |
1633 | //Now the CRC | |
1634 | crc = Crc(cmd, 10); // the crc needs to be calculated over 2 bytes | |
1635 | cmd[10] = crc & 0xff; | |
1636 | cmd[11] = crc >> 8; | |
1637 | ||
1638 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1639 | } | |
1640 | ||
1641 | ||
1642 | // do not use; has a fix UID | |
1643 | static void __attribute__((unused)) BuildReadMultiBlockRequest(uint8_t *uid) | |
1644 | { | |
1645 | uint8_t cmd[14]; | |
1646 | ||
1647 | uint16_t crc; | |
1648 | // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block | |
1649 | // followed by teh block data | |
1650 | // one sub-carrier, inventory, 1 slot, fast rate | |
1651 | cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit | |
1652 | // READ Multi BLOCK command code | |
1653 | cmd[1] = 0x23; | |
1654 | // UID may be optionally specified here | |
1655 | // 64-bit UID | |
1656 | cmd[2] = 0x32; | |
1657 | cmd[3]= 0x4b; | |
1658 | cmd[4] = 0x03; | |
1659 | cmd[5] = 0x01; | |
1660 | cmd[6] = 0x00; | |
1661 | cmd[7] = 0x10; | |
1662 | cmd[8] = 0x05; | |
1663 | cmd[9]= 0xe0; // always e0 (not exactly unique) | |
1664 | // First Block number to read | |
1665 | cmd[10] = 0x00; | |
1666 | // Number of Blocks to read | |
1667 | cmd[11] = 0x2f; // read quite a few | |
1668 | //Now the CRC | |
1669 | crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes | |
1670 | cmd[12] = crc & 0xff; | |
1671 | cmd[13] = crc >> 8; | |
1672 | ||
1673 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1674 | } | |
1675 | ||
1676 | // do not use; has a fix UID | |
1677 | static void __attribute__((unused)) BuildArbitraryRequest(uint8_t *uid,uint8_t CmdCode) | |
1678 | { | |
1679 | uint8_t cmd[14]; | |
1680 | ||
1681 | uint16_t crc; | |
1682 | // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block | |
1683 | // followed by teh block data | |
1684 | // one sub-carrier, inventory, 1 slot, fast rate | |
1685 | cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit | |
1686 | // READ BLOCK command code | |
1687 | cmd[1] = CmdCode; | |
1688 | // UID may be optionally specified here | |
1689 | // 64-bit UID | |
1690 | cmd[2] = 0x32; | |
1691 | cmd[3]= 0x4b; | |
1692 | cmd[4] = 0x03; | |
1693 | cmd[5] = 0x01; | |
1694 | cmd[6] = 0x00; | |
1695 | cmd[7] = 0x10; | |
1696 | cmd[8] = 0x05; | |
1697 | cmd[9]= 0xe0; // always e0 (not exactly unique) | |
1698 | // Parameter | |
1699 | cmd[10] = 0x00; | |
1700 | cmd[11] = 0x0a; | |
1701 | ||
1702 | // cmd[12] = 0x00; | |
1703 | // cmd[13] = 0x00; //Now the CRC | |
1704 | crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes | |
1705 | cmd[12] = crc & 0xff; | |
1706 | cmd[13] = crc >> 8; | |
1707 | ||
1708 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1709 | } | |
1710 | ||
1711 | // do not use; has a fix UID | |
1712 | static void __attribute__((unused)) BuildArbitraryCustomRequest(uint8_t uid[], uint8_t CmdCode) | |
1713 | { | |
1714 | uint8_t cmd[14]; | |
1715 | ||
1716 | uint16_t crc; | |
1717 | // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block | |
1718 | // followed by teh block data | |
1719 | // one sub-carrier, inventory, 1 slot, fast rate | |
1720 | cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit | |
1721 | // READ BLOCK command code | |
1722 | cmd[1] = CmdCode; | |
1723 | // UID may be optionally specified here | |
1724 | // 64-bit UID | |
1725 | cmd[2] = 0x32; | |
1726 | cmd[3]= 0x4b; | |
1727 | cmd[4] = 0x03; | |
1728 | cmd[5] = 0x01; | |
1729 | cmd[6] = 0x00; | |
1730 | cmd[7] = 0x10; | |
1731 | cmd[8] = 0x05; | |
1732 | cmd[9]= 0xe0; // always e0 (not exactly unique) | |
1733 | // Parameter | |
1734 | cmd[10] = 0x05; // for custom codes this must be manufcturer code | |
1735 | cmd[11] = 0x00; | |
1736 | ||
1737 | // cmd[12] = 0x00; | |
1738 | // cmd[13] = 0x00; //Now the CRC | |
1739 | crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes | |
1740 | cmd[12] = crc & 0xff; | |
1741 | cmd[13] = crc >> 8; | |
1742 | ||
1743 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1744 | } | |
1745 | ||
1746 | ||
1747 | ||
1748 | ||
1749 | */ | |
1750 | ||
1751 |