]>
Commit | Line | Data |
---|---|---|
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 basically contains transmission and receiving of bits | |
72 | /////////////////////////////////////////////////////////////////////// | |
73 | ||
74 | // buffers | |
75 | #define ISO15693_DMA_BUFFER_SIZE 2048 // must be a power of 2 | |
76 | #define ISO15693_MAX_RESPONSE_LENGTH 36 // allows read single block with the maximum block size of 256bits. Read multiple blocks not supported yet | |
77 | #define ISO15693_MAX_COMMAND_LENGTH 45 // allows write single block with the maximum block size of 256bits. Write multiple blocks not supported yet | |
78 | ||
79 | // --------------------------- | |
80 | // Signal Processing | |
81 | // --------------------------- | |
82 | ||
83 | // prepare data using "1 out of 4" code for later transmission | |
84 | // resulting data rate is 26.48 kbit/s (fc/512) | |
85 | // cmd ... data | |
86 | // n ... length of data | |
87 | static void CodeIso15693AsReader(uint8_t *cmd, int n) | |
88 | { | |
89 | int i, j; | |
90 | ||
91 | ToSendReset(); | |
92 | ||
93 | // Give it a bit of slack at the beginning | |
94 | for(i = 0; i < 24; i++) { | |
95 | ToSendStuffBit(1); | |
96 | } | |
97 | ||
98 | // SOF for 1of4 | |
99 | ToSendStuffBit(0); | |
100 | ToSendStuffBit(1); | |
101 | ToSendStuffBit(1); | |
102 | ToSendStuffBit(1); | |
103 | ToSendStuffBit(1); | |
104 | ToSendStuffBit(0); | |
105 | ToSendStuffBit(1); | |
106 | ToSendStuffBit(1); | |
107 | for(i = 0; i < n; i++) { | |
108 | for(j = 0; j < 8; j += 2) { | |
109 | int these = (cmd[i] >> j) & 3; | |
110 | switch(these) { | |
111 | case 0: | |
112 | ToSendStuffBit(1); | |
113 | ToSendStuffBit(0); | |
114 | ToSendStuffBit(1); | |
115 | ToSendStuffBit(1); | |
116 | ToSendStuffBit(1); | |
117 | ToSendStuffBit(1); | |
118 | ToSendStuffBit(1); | |
119 | ToSendStuffBit(1); | |
120 | break; | |
121 | case 1: | |
122 | ToSendStuffBit(1); | |
123 | ToSendStuffBit(1); | |
124 | ToSendStuffBit(1); | |
125 | ToSendStuffBit(0); | |
126 | ToSendStuffBit(1); | |
127 | ToSendStuffBit(1); | |
128 | ToSendStuffBit(1); | |
129 | ToSendStuffBit(1); | |
130 | break; | |
131 | case 2: | |
132 | ToSendStuffBit(1); | |
133 | ToSendStuffBit(1); | |
134 | ToSendStuffBit(1); | |
135 | ToSendStuffBit(1); | |
136 | ToSendStuffBit(1); | |
137 | ToSendStuffBit(0); | |
138 | ToSendStuffBit(1); | |
139 | ToSendStuffBit(1); | |
140 | break; | |
141 | case 3: | |
142 | ToSendStuffBit(1); | |
143 | ToSendStuffBit(1); | |
144 | ToSendStuffBit(1); | |
145 | ToSendStuffBit(1); | |
146 | ToSendStuffBit(1); | |
147 | ToSendStuffBit(1); | |
148 | ToSendStuffBit(1); | |
149 | ToSendStuffBit(0); | |
150 | break; | |
151 | } | |
152 | } | |
153 | } | |
154 | // EOF | |
155 | ToSendStuffBit(1); | |
156 | ToSendStuffBit(1); | |
157 | ToSendStuffBit(0); | |
158 | ToSendStuffBit(1); | |
159 | ||
160 | // Fill remainder of last byte with 1 | |
161 | for(i = 0; i < 4; i++) { | |
162 | ToSendStuffBit(1); | |
163 | } | |
164 | ||
165 | ToSendMax++; | |
166 | } | |
167 | ||
168 | // encode data using "1 out of 256" scheme | |
169 | // data rate is 1,66 kbit/s (fc/8192) | |
170 | // is designed for more robust communication over longer distances | |
171 | static void CodeIso15693AsReader256(uint8_t *cmd, int n) | |
172 | { | |
173 | int i, j; | |
174 | ||
175 | ToSendReset(); | |
176 | ||
177 | // Give it a bit of slack at the beginning | |
178 | for(i = 0; i < 24; i++) { | |
179 | ToSendStuffBit(1); | |
180 | } | |
181 | ||
182 | // SOF for 1of256 | |
183 | ToSendStuffBit(0); | |
184 | ToSendStuffBit(1); | |
185 | ToSendStuffBit(1); | |
186 | ToSendStuffBit(1); | |
187 | ToSendStuffBit(1); | |
188 | ToSendStuffBit(1); | |
189 | ToSendStuffBit(1); | |
190 | ToSendStuffBit(0); | |
191 | ||
192 | for(i = 0; i < n; i++) { | |
193 | for (j = 0; j<=255; j++) { | |
194 | if (cmd[i]==j) { | |
195 | ToSendStuffBit(1); | |
196 | ToSendStuffBit(0); | |
197 | } else { | |
198 | ToSendStuffBit(1); | |
199 | ToSendStuffBit(1); | |
200 | } | |
201 | } | |
202 | } | |
203 | // EOF | |
204 | ToSendStuffBit(1); | |
205 | ToSendStuffBit(1); | |
206 | ToSendStuffBit(0); | |
207 | ToSendStuffBit(1); | |
208 | ||
209 | // Fill remainder of last byte with 1 | |
210 | for(i = 0; i < 4; i++) { | |
211 | ToSendStuffBit(1); | |
212 | } | |
213 | ||
214 | ToSendMax++; | |
215 | } | |
216 | ||
217 | ||
218 | // static uint8_t encode4Bits(const uint8_t b) { | |
219 | // uint8_t c = b & 0xF; | |
220 | // // OTA, the least significant bits first | |
221 | // // The columns are | |
222 | // // 1 - Bit value to send | |
223 | // // 2 - Reversed (big-endian) | |
224 | // // 3 - Manchester Encoded | |
225 | // // 4 - Hex values | |
226 | ||
227 | // switch(c){ | |
228 | // // 1 2 3 4 | |
229 | // case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55 | |
230 | // case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95 | |
231 | // case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65 | |
232 | // case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5 | |
233 | // case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59 | |
234 | // case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99 | |
235 | // case 9: return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69 | |
236 | // case 8: return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9 | |
237 | // case 7: return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56 | |
238 | // case 6: return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96 | |
239 | // case 5: return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66 | |
240 | // case 4: return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6 | |
241 | // case 3: return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a | |
242 | // case 2: return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a | |
243 | // case 1: return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a | |
244 | // default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa | |
245 | ||
246 | // } | |
247 | // } | |
248 | ||
249 | void CodeIso15693AsTag(uint8_t *cmd, size_t len) { | |
250 | /* | |
251 | * SOF comprises 3 parts; | |
252 | * * An unmodulated time of 56.64 us | |
253 | * * 24 pulses of 423.75 kHz (fc/32) | |
254 | * * A logic 1, which starts with an unmodulated time of 18.88us | |
255 | * followed by 8 pulses of 423.75kHz (fc/32) | |
256 | * | |
257 | * EOF comprises 3 parts: | |
258 | * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated | |
259 | * time of 18.88us. | |
260 | * - 24 pulses of fc/32 | |
261 | * - An unmodulated time of 56.64 us | |
262 | * | |
263 | * A logic 0 starts with 8 pulses of fc/32 | |
264 | * followed by an unmodulated time of 256/fc (~18,88us). | |
265 | * | |
266 | * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by | |
267 | * 8 pulses of fc/32 (also 18.88us) | |
268 | * | |
269 | * A bit here becomes 8 pulses of fc/32. Therefore: | |
270 | * The SOF can be written as 00011101 = 0x1D | |
271 | * The EOF can be written as 10111000 = 0xb8 | |
272 | * A logic 1 is 01 | |
273 | * A logic 0 is 10 | |
274 | * | |
275 | * */ | |
276 | ||
277 | ToSendReset(); | |
278 | ||
279 | // SOF | |
280 | ToSend[++ToSendMax] = 0x1D; // 00011101 | |
281 | ||
282 | // data | |
283 | for(int i = 0; i < len; i++) { | |
284 | for(int j = 0; j < 8; j++) { | |
285 | if ((cmd[i] >> j) & 0x01) { | |
286 | ToSendStuffBit(0); | |
287 | ToSendStuffBit(1); | |
288 | } else { | |
289 | ToSendStuffBit(1); | |
290 | ToSendStuffBit(0); | |
291 | } | |
292 | } | |
293 | } | |
294 | ||
295 | // EOF | |
296 | ToSend[++ToSendMax] = 0xB8; // 10111000 | |
297 | ||
298 | ToSendMax++; | |
299 | } | |
300 | ||
301 | ||
302 | // Transmit the command (to the tag) that was placed in cmd[]. | |
303 | static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time) | |
304 | { | |
305 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_FULL_MOD); | |
306 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); | |
307 | ||
308 | while (GetCountSspClk() < start_time) ; | |
309 | ||
310 | LED_B_ON(); | |
311 | for(int c = 0; c < len; c++) { | |
312 | uint8_t data = cmd[c]; | |
313 | for (int i = 0; i < 8; i++) { | |
314 | uint16_t send_word = (data & 0x80) ? 0x0000 : 0xffff; | |
315 | while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ; | |
316 | AT91C_BASE_SSC->SSC_THR = send_word; | |
317 | while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ; | |
318 | AT91C_BASE_SSC->SSC_THR = send_word; | |
319 | data <<= 1; | |
320 | } | |
321 | WDT_HIT(); | |
322 | } | |
323 | LED_B_OFF(); | |
324 | } | |
325 | ||
326 | ||
327 | //----------------------------------------------------------------------------- | |
328 | // Transmit the tag response (to the reader) that was placed in cmd[]. | |
329 | //----------------------------------------------------------------------------- | |
330 | void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, bool slow) { | |
331 | // don't use the FPGA_HF_SIMULATOR_MODULATE_424K_8BIT minor mode. It would spoil GetCountSspClk() | |
332 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K); | |
333 | ||
334 | uint8_t shift_delay = start_time & 0x00000007; | |
335 | ||
336 | while (GetCountSspClk() < (start_time & 0xfffffff8)) ; | |
337 | ||
338 | LED_C_ON(); | |
339 | uint8_t bits_to_shift = 0x00; | |
340 | uint8_t bits_to_send = 0x00; | |
341 | for(size_t c = 0; c < len; c++) { | |
342 | for (int i = 7; i >= 0; i--) { | |
343 | uint8_t cmd_bits = ((cmd[c] >> i) & 0x01) ? 0xff : 0x00; | |
344 | for (int j = 0; j < (slow?4:1); ) { | |
345 | if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { | |
346 | bits_to_send = bits_to_shift << (8 - shift_delay) | cmd_bits >> shift_delay; | |
347 | AT91C_BASE_SSC->SSC_THR = bits_to_send; | |
348 | bits_to_shift = cmd_bits; | |
349 | j++; | |
350 | } | |
351 | } | |
352 | } | |
353 | WDT_HIT(); | |
354 | } | |
355 | // send the remaining bits, padded with 0: | |
356 | bits_to_send = bits_to_shift << (8 - shift_delay); | |
357 | for ( ; ; ) { | |
358 | if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { | |
359 | AT91C_BASE_SSC->SSC_THR = bits_to_send; | |
360 | break; | |
361 | } | |
362 | } | |
363 | LED_C_OFF(); | |
364 | ||
365 | } | |
366 | ||
367 | ||
368 | //============================================================================= | |
369 | // An ISO 15693 decoder for tag responses (one subcarrier only). | |
370 | // Uses cross correlation to identify each bit and EOF. | |
371 | // This function is called 8 times per bit (every 2 subcarrier cycles). | |
372 | // Subcarrier frequency fs is 424kHz, 1/fs = 2,36us, | |
373 | // i.e. function is called every 4,72us | |
374 | // LED handling: | |
375 | // LED C -> ON once we have received the SOF and are expecting the rest. | |
376 | // LED C -> OFF once we have received EOF or are unsynced | |
377 | // | |
378 | // Returns: true if we received a EOF | |
379 | // false if we are still waiting for some more | |
380 | //============================================================================= | |
381 | ||
382 | #define NOISE_THRESHOLD 160 // don't try to correlate noise | |
383 | ||
384 | typedef struct DecodeTag { | |
385 | enum { | |
386 | STATE_TAG_SOF_LOW, | |
387 | STATE_TAG_SOF_HIGH, | |
388 | STATE_TAG_SOF_HIGH_END, | |
389 | STATE_TAG_RECEIVING_DATA, | |
390 | STATE_TAG_EOF | |
391 | } state; | |
392 | int bitCount; | |
393 | int posCount; | |
394 | enum { | |
395 | LOGIC0, | |
396 | LOGIC1, | |
397 | SOF_PART1, | |
398 | SOF_PART2 | |
399 | } lastBit; | |
400 | uint16_t shiftReg; | |
401 | uint16_t max_len; | |
402 | uint8_t *output; | |
403 | int len; | |
404 | int sum1, sum2; | |
405 | } DecodeTag_t; | |
406 | ||
407 | ||
408 | static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag) | |
409 | { | |
410 | switch(DecodeTag->state) { | |
411 | case STATE_TAG_SOF_LOW: | |
412 | // waiting for 12 times low (11 times low is accepted as well) | |
413 | if (amplitude < NOISE_THRESHOLD) { | |
414 | DecodeTag->posCount++; | |
415 | } else { | |
416 | if (DecodeTag->posCount > 10) { | |
417 | DecodeTag->posCount = 1; | |
418 | DecodeTag->sum1 = 0; | |
419 | DecodeTag->state = STATE_TAG_SOF_HIGH; | |
420 | } else { | |
421 | DecodeTag->posCount = 0; | |
422 | } | |
423 | } | |
424 | break; | |
425 | ||
426 | case STATE_TAG_SOF_HIGH: | |
427 | // waiting for 10 times high. Take average over the last 8 | |
428 | if (amplitude > NOISE_THRESHOLD) { | |
429 | DecodeTag->posCount++; | |
430 | if (DecodeTag->posCount > 2) { | |
431 | DecodeTag->sum1 += amplitude; // keep track of average high value | |
432 | } | |
433 | if (DecodeTag->posCount == 10) { | |
434 | DecodeTag->sum1 >>= 4; // calculate half of average high value (8 samples) | |
435 | DecodeTag->state = STATE_TAG_SOF_HIGH_END; | |
436 | } | |
437 | } else { // high phase was too short | |
438 | DecodeTag->posCount = 1; | |
439 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
440 | } | |
441 | break; | |
442 | ||
443 | case STATE_TAG_SOF_HIGH_END: | |
444 | // waiting for a falling edge | |
445 | if (amplitude < DecodeTag->sum1) { // signal drops below 50% average high: a falling edge | |
446 | DecodeTag->lastBit = SOF_PART1; // detected 1st part of SOF (12 samples low and 12 samples high) | |
447 | DecodeTag->shiftReg = 0; | |
448 | DecodeTag->bitCount = 0; | |
449 | DecodeTag->len = 0; | |
450 | DecodeTag->sum1 = amplitude; | |
451 | DecodeTag->sum2 = 0; | |
452 | DecodeTag->posCount = 2; | |
453 | DecodeTag->state = STATE_TAG_RECEIVING_DATA; | |
454 | LED_C_ON(); | |
455 | } else { | |
456 | DecodeTag->posCount++; | |
457 | if (DecodeTag->posCount > 13) { // high phase too long | |
458 | DecodeTag->posCount = 0; | |
459 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
460 | LED_C_OFF(); | |
461 | } | |
462 | } | |
463 | break; | |
464 | ||
465 | case STATE_TAG_RECEIVING_DATA: | |
466 | if (DecodeTag->posCount == 1) { | |
467 | DecodeTag->sum1 = 0; | |
468 | DecodeTag->sum2 = 0; | |
469 | } | |
470 | if (DecodeTag->posCount <= 4) { | |
471 | DecodeTag->sum1 += amplitude; | |
472 | } else { | |
473 | DecodeTag->sum2 += amplitude; | |
474 | } | |
475 | if (DecodeTag->posCount == 8) { | |
476 | int32_t corr_1 = DecodeTag->sum2 - DecodeTag->sum1; | |
477 | int32_t corr_0 = -corr_1; | |
478 | int32_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 2; | |
479 | if (corr_EOF > corr_0 && corr_EOF > corr_1) { | |
480 | if (DecodeTag->lastBit == LOGIC0) { // this was already part of EOF | |
481 | DecodeTag->state = STATE_TAG_EOF; | |
482 | } else { | |
483 | DecodeTag->posCount = 0; | |
484 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
485 | LED_C_OFF(); | |
486 | } | |
487 | } else if (corr_1 > corr_0) { | |
488 | // logic 1 | |
489 | if (DecodeTag->lastBit == SOF_PART1) { // still part of SOF | |
490 | DecodeTag->lastBit = SOF_PART2; // SOF completed | |
491 | } else { | |
492 | DecodeTag->lastBit = LOGIC1; | |
493 | DecodeTag->shiftReg >>= 1; | |
494 | DecodeTag->shiftReg |= 0x80; | |
495 | DecodeTag->bitCount++; | |
496 | if (DecodeTag->bitCount == 8) { | |
497 | DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; | |
498 | DecodeTag->len++; | |
499 | if (DecodeTag->len > DecodeTag->max_len) { | |
500 | // buffer overflow, give up | |
501 | DecodeTag->posCount = 0; | |
502 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
503 | LED_C_OFF(); | |
504 | } | |
505 | DecodeTag->bitCount = 0; | |
506 | DecodeTag->shiftReg = 0; | |
507 | } | |
508 | } | |
509 | } else { | |
510 | // logic 0 | |
511 | if (DecodeTag->lastBit == SOF_PART1) { // incomplete SOF | |
512 | DecodeTag->posCount = 0; | |
513 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
514 | LED_C_OFF(); | |
515 | } else { | |
516 | DecodeTag->lastBit = LOGIC0; | |
517 | DecodeTag->shiftReg >>= 1; | |
518 | DecodeTag->bitCount++; | |
519 | if (DecodeTag->bitCount == 8) { | |
520 | DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; | |
521 | DecodeTag->len++; | |
522 | if (DecodeTag->len > DecodeTag->max_len) { | |
523 | // buffer overflow, give up | |
524 | DecodeTag->posCount = 0; | |
525 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
526 | LED_C_OFF(); | |
527 | } | |
528 | DecodeTag->bitCount = 0; | |
529 | DecodeTag->shiftReg = 0; | |
530 | } | |
531 | } | |
532 | } | |
533 | DecodeTag->posCount = 0; | |
534 | } | |
535 | DecodeTag->posCount++; | |
536 | break; | |
537 | ||
538 | case STATE_TAG_EOF: | |
539 | if (DecodeTag->posCount == 1) { | |
540 | DecodeTag->sum1 = 0; | |
541 | DecodeTag->sum2 = 0; | |
542 | } | |
543 | if (DecodeTag->posCount <= 4) { | |
544 | DecodeTag->sum1 += amplitude; | |
545 | } else { | |
546 | DecodeTag->sum2 += amplitude; | |
547 | } | |
548 | if (DecodeTag->posCount == 8) { | |
549 | int32_t corr_1 = DecodeTag->sum2 - DecodeTag->sum1; | |
550 | int32_t corr_0 = -corr_1; | |
551 | int32_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 2; | |
552 | if (corr_EOF > corr_0 || corr_1 > corr_0) { | |
553 | DecodeTag->posCount = 0; | |
554 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
555 | LED_C_OFF(); | |
556 | } else { | |
557 | LED_C_OFF(); | |
558 | return true; | |
559 | } | |
560 | } | |
561 | DecodeTag->posCount++; | |
562 | break; | |
563 | ||
564 | } | |
565 | ||
566 | return false; | |
567 | } | |
568 | ||
569 | ||
570 | static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_len) | |
571 | { | |
572 | DecodeTag->posCount = 0; | |
573 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
574 | DecodeTag->output = data; | |
575 | DecodeTag->max_len = max_len; | |
576 | } | |
577 | ||
578 | ||
579 | static void DecodeTagReset(DecodeTag_t *DecodeTag) | |
580 | { | |
581 | DecodeTag->posCount = 0; | |
582 | DecodeTag->state = STATE_TAG_SOF_LOW; | |
583 | } | |
584 | ||
585 | ||
586 | /* | |
587 | * Receive and decode the tag response, also log to tracebuffer | |
588 | */ | |
589 | static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int timeout) | |
590 | { | |
591 | int samples = 0; | |
592 | bool gotFrame = false; | |
593 | ||
594 | uint16_t *dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); | |
595 | ||
596 | // the Decoder data structure | |
597 | DecodeTag_t DecodeTag = { 0 }; | |
598 | DecodeTagInit(&DecodeTag, response, max_len); | |
599 | ||
600 | // wait for last transfer to complete | |
601 | while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); | |
602 | ||
603 | // And put the FPGA in the appropriate mode | |
604 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_SUBCARRIER_424_KHZ | FPGA_HF_READER_MODE_RECEIVE_AMPLITUDE); | |
605 | ||
606 | // Setup and start DMA. | |
607 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); | |
608 | FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
609 | uint16_t *upTo = dmaBuf; | |
610 | ||
611 | for(;;) { | |
612 | uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); | |
613 | ||
614 | if (behindBy == 0) continue; | |
615 | ||
616 | uint16_t tagdata = *upTo++; | |
617 | ||
618 | if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. | |
619 | upTo = dmaBuf; // start reading the circular buffer from the beginning | |
620 | if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { | |
621 | Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); | |
622 | break; | |
623 | } | |
624 | } | |
625 | if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. | |
626 | AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and | |
627 | AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers | |
628 | } | |
629 | ||
630 | samples++; | |
631 | ||
632 | if (Handle15693SamplesFromTag(tagdata, &DecodeTag)) { | |
633 | gotFrame = true; | |
634 | break; | |
635 | } | |
636 | ||
637 | if (samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) { | |
638 | DecodeTag.len = 0; | |
639 | break; | |
640 | } | |
641 | ||
642 | } | |
643 | ||
644 | FpgaDisableSscDma(); | |
645 | BigBuf_free(); | |
646 | ||
647 | if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", | |
648 | samples, gotFrame, DecodeTag.state, DecodeTag.len, DecodeTag.bitCount, DecodeTag.posCount); | |
649 | ||
650 | if (DecodeTag.len > 0) { | |
651 | LogTrace(DecodeTag.output, DecodeTag.len, 0, 0, NULL, false); | |
652 | } | |
653 | ||
654 | return DecodeTag.len; | |
655 | } | |
656 | ||
657 | ||
658 | //============================================================================= | |
659 | // An ISO15693 decoder for reader commands. | |
660 | // | |
661 | // This function is called 4 times per bit (every 2 subcarrier cycles). | |
662 | // Subcarrier frequency fs is 848kHz, 1/fs = 1,18us, i.e. function is called every 2,36us | |
663 | // LED handling: | |
664 | // LED B -> ON once we have received the SOF and are expecting the rest. | |
665 | // LED B -> OFF once we have received EOF or are in error state or unsynced | |
666 | // | |
667 | // Returns: true if we received a EOF | |
668 | // false if we are still waiting for some more | |
669 | //============================================================================= | |
670 | ||
671 | typedef struct DecodeReader { | |
672 | enum { | |
673 | STATE_READER_UNSYNCD, | |
674 | STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF, | |
675 | STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF, | |
676 | STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF, | |
677 | STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4, | |
678 | STATE_READER_RECEIVE_DATA_1_OUT_OF_4, | |
679 | STATE_READER_RECEIVE_DATA_1_OUT_OF_256 | |
680 | } state; | |
681 | enum { | |
682 | CODING_1_OUT_OF_4, | |
683 | CODING_1_OUT_OF_256 | |
684 | } Coding; | |
685 | uint8_t shiftReg; | |
686 | uint8_t bitCount; | |
687 | int byteCount; | |
688 | int byteCountMax; | |
689 | int posCount; | |
690 | int sum1, sum2; | |
691 | uint8_t *output; | |
692 | } DecodeReader_t; | |
693 | ||
694 | ||
695 | static void DecodeReaderInit(DecodeReader_t* DecodeReader, uint8_t *data, uint16_t max_len) | |
696 | { | |
697 | DecodeReader->output = data; | |
698 | DecodeReader->byteCountMax = max_len; | |
699 | DecodeReader->state = STATE_READER_UNSYNCD; | |
700 | DecodeReader->byteCount = 0; | |
701 | DecodeReader->bitCount = 0; | |
702 | DecodeReader->posCount = 1; | |
703 | DecodeReader->shiftReg = 0; | |
704 | } | |
705 | ||
706 | ||
707 | static void DecodeReaderReset(DecodeReader_t* DecodeReader) | |
708 | { | |
709 | DecodeReader->state = STATE_READER_UNSYNCD; | |
710 | } | |
711 | ||
712 | ||
713 | static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uint8_t bit, DecodeReader_t *restrict DecodeReader) | |
714 | { | |
715 | switch (DecodeReader->state) { | |
716 | case STATE_READER_UNSYNCD: | |
717 | if (!bit) { | |
718 | // we went low, so this could be the beginning of a SOF | |
719 | DecodeReader->posCount = 1; | |
720 | DecodeReader->state = STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF; | |
721 | } | |
722 | break; | |
723 | ||
724 | case STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF: | |
725 | DecodeReader->posCount++; | |
726 | if (bit) { // detected rising edge | |
727 | if (DecodeReader->posCount < 4) { // rising edge too early (nominally expected at 5) | |
728 | DecodeReaderReset(DecodeReader); | |
729 | } else { // SOF | |
730 | DecodeReader->state = STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF; | |
731 | } | |
732 | } else { | |
733 | if (DecodeReader->posCount > 5) { // stayed low for too long | |
734 | DecodeReaderReset(DecodeReader); | |
735 | } else { | |
736 | // do nothing, keep waiting | |
737 | } | |
738 | } | |
739 | break; | |
740 | ||
741 | case STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF: | |
742 | DecodeReader->posCount++; | |
743 | if (!bit) { // detected a falling edge | |
744 | if (DecodeReader->posCount < 20) { // falling edge too early (nominally expected at 21 earliest) | |
745 | DecodeReaderReset(DecodeReader); | |
746 | } else if (DecodeReader->posCount < 23) { // SOF for 1 out of 4 coding | |
747 | DecodeReader->Coding = CODING_1_OUT_OF_4; | |
748 | DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; | |
749 | } else if (DecodeReader->posCount < 28) { // falling edge too early (nominally expected at 29 latest) | |
750 | DecodeReaderReset(DecodeReader); | |
751 | } else { // SOF for 1 out of 4 coding | |
752 | DecodeReader->Coding = CODING_1_OUT_OF_256; | |
753 | DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; | |
754 | } | |
755 | } else { | |
756 | if (DecodeReader->posCount > 29) { // stayed high for too long | |
757 | DecodeReaderReset(DecodeReader); | |
758 | } else { | |
759 | // do nothing, keep waiting | |
760 | } | |
761 | } | |
762 | break; | |
763 | ||
764 | case STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF: | |
765 | DecodeReader->posCount++; | |
766 | if (bit) { // detected rising edge | |
767 | if (DecodeReader->Coding == CODING_1_OUT_OF_256) { | |
768 | if (DecodeReader->posCount < 32) { // rising edge too early (nominally expected at 33) | |
769 | DecodeReaderReset(DecodeReader); | |
770 | } else { | |
771 | DecodeReader->posCount = 1; | |
772 | DecodeReader->bitCount = 0; | |
773 | DecodeReader->byteCount = 0; | |
774 | DecodeReader->sum1 = 1; | |
775 | DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_256; | |
776 | LED_B_ON(); | |
777 | } | |
778 | } else { // CODING_1_OUT_OF_4 | |
779 | if (DecodeReader->posCount < 24) { // rising edge too early (nominally expected at 25) | |
780 | DecodeReaderReset(DecodeReader); | |
781 | } else { | |
782 | DecodeReader->state = STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4; | |
783 | } | |
784 | } | |
785 | } else { | |
786 | if (DecodeReader->Coding == CODING_1_OUT_OF_256) { | |
787 | if (DecodeReader->posCount > 34) { // signal stayed low for too long | |
788 | DecodeReaderReset(DecodeReader); | |
789 | } else { | |
790 | // do nothing, keep waiting | |
791 | } | |
792 | } else { // CODING_1_OUT_OF_4 | |
793 | if (DecodeReader->posCount > 26) { // signal stayed low for too long | |
794 | DecodeReaderReset(DecodeReader); | |
795 | } else { | |
796 | // do nothing, keep waiting | |
797 | } | |
798 | } | |
799 | } | |
800 | break; | |
801 | ||
802 | case STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4: | |
803 | DecodeReader->posCount++; | |
804 | if (bit) { | |
805 | if (DecodeReader->posCount == 33) { | |
806 | DecodeReader->posCount = 1; | |
807 | DecodeReader->bitCount = 0; | |
808 | DecodeReader->byteCount = 0; | |
809 | DecodeReader->sum1 = 1; | |
810 | DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_4; | |
811 | LED_B_ON(); | |
812 | } else { | |
813 | // do nothing, keep waiting | |
814 | } | |
815 | } else { // unexpected falling edge | |
816 | DecodeReaderReset(DecodeReader); | |
817 | } | |
818 | break; | |
819 | ||
820 | case STATE_READER_RECEIVE_DATA_1_OUT_OF_4: | |
821 | DecodeReader->posCount++; | |
822 | if (DecodeReader->posCount == 1) { | |
823 | DecodeReader->sum1 = bit; | |
824 | } else if (DecodeReader->posCount <= 4) { | |
825 | DecodeReader->sum1 += bit; | |
826 | } else if (DecodeReader->posCount == 5) { | |
827 | DecodeReader->sum2 = bit; | |
828 | } else { | |
829 | DecodeReader->sum2 += bit; | |
830 | } | |
831 | if (DecodeReader->posCount == 8) { | |
832 | DecodeReader->posCount = 0; | |
833 | int corr10 = DecodeReader->sum1 - DecodeReader->sum2; | |
834 | int corr01 = DecodeReader->sum2 - DecodeReader->sum1; | |
835 | int corr11 = (DecodeReader->sum1 + DecodeReader->sum2) / 2; | |
836 | if (corr01 > corr11 && corr01 > corr10) { // EOF | |
837 | LED_B_OFF(); // Finished receiving | |
838 | DecodeReaderReset(DecodeReader); | |
839 | if (DecodeReader->byteCount != 0) { | |
840 | return true; | |
841 | } | |
842 | } | |
843 | if (corr10 > corr11) { // detected a 2bit position | |
844 | DecodeReader->shiftReg >>= 2; | |
845 | DecodeReader->shiftReg |= (DecodeReader->bitCount << 6); | |
846 | } | |
847 | if (DecodeReader->bitCount == 15) { // we have a full byte | |
848 | DecodeReader->output[DecodeReader->byteCount++] = DecodeReader->shiftReg; | |
849 | if (DecodeReader->byteCount > DecodeReader->byteCountMax) { | |
850 | // buffer overflow, give up | |
851 | LED_B_OFF(); | |
852 | DecodeReaderReset(DecodeReader); | |
853 | } | |
854 | DecodeReader->bitCount = 0; | |
855 | DecodeReader->shiftReg = 0; | |
856 | } else { | |
857 | DecodeReader->bitCount++; | |
858 | } | |
859 | } | |
860 | break; | |
861 | ||
862 | case STATE_READER_RECEIVE_DATA_1_OUT_OF_256: | |
863 | DecodeReader->posCount++; | |
864 | if (DecodeReader->posCount == 1) { | |
865 | DecodeReader->sum1 = bit; | |
866 | } else if (DecodeReader->posCount <= 4) { | |
867 | DecodeReader->sum1 += bit; | |
868 | } else if (DecodeReader->posCount == 5) { | |
869 | DecodeReader->sum2 = bit; | |
870 | } else { | |
871 | DecodeReader->sum2 += bit; | |
872 | } | |
873 | if (DecodeReader->posCount == 8) { | |
874 | DecodeReader->posCount = 0; | |
875 | int corr10 = DecodeReader->sum1 - DecodeReader->sum2; | |
876 | int corr01 = DecodeReader->sum2 - DecodeReader->sum1; | |
877 | int corr11 = (DecodeReader->sum1 + DecodeReader->sum2) / 2; | |
878 | if (corr01 > corr11 && corr01 > corr10) { // EOF | |
879 | LED_B_OFF(); // Finished receiving | |
880 | DecodeReaderReset(DecodeReader); | |
881 | if (DecodeReader->byteCount != 0) { | |
882 | return true; | |
883 | } | |
884 | } | |
885 | if (corr10 > corr11) { // detected the bit position | |
886 | DecodeReader->shiftReg = DecodeReader->bitCount; | |
887 | } | |
888 | if (DecodeReader->bitCount == 255) { // we have a full byte | |
889 | DecodeReader->output[DecodeReader->byteCount++] = DecodeReader->shiftReg; | |
890 | if (DecodeReader->byteCount > DecodeReader->byteCountMax) { | |
891 | // buffer overflow, give up | |
892 | LED_B_OFF(); | |
893 | DecodeReaderReset(DecodeReader); | |
894 | } | |
895 | } | |
896 | DecodeReader->bitCount++; | |
897 | } | |
898 | break; | |
899 | ||
900 | default: | |
901 | LED_B_OFF(); | |
902 | DecodeReaderReset(DecodeReader); | |
903 | break; | |
904 | } | |
905 | ||
906 | return false; | |
907 | } | |
908 | ||
909 | ||
910 | //----------------------------------------------------------------------------- | |
911 | // Receive a command (from the reader to us, where we are the simulated tag), | |
912 | // and store it in the given buffer, up to the given maximum length. Keeps | |
913 | // spinning, waiting for a well-framed command, until either we get one | |
914 | // (returns len) or someone presses the pushbutton on the board (returns -1). | |
915 | // | |
916 | // Assume that we're called with the SSC (to the FPGA) and ADC path set | |
917 | // correctly. | |
918 | //----------------------------------------------------------------------------- | |
919 | ||
920 | int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time) { | |
921 | int samples = 0; | |
922 | bool gotFrame = false; | |
923 | uint8_t b; | |
924 | ||
925 | uint8_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; | |
926 | ||
927 | // the decoder data structure | |
928 | DecodeReader_t DecodeReader = {0}; | |
929 | DecodeReaderInit(&DecodeReader, received, max_len); | |
930 | ||
931 | // wait for last transfer to complete | |
932 | while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); | |
933 | ||
934 | LED_D_OFF(); | |
935 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); | |
936 | ||
937 | // clear receive register and wait for next transfer | |
938 | uint32_t temp = AT91C_BASE_SSC->SSC_RHR; | |
939 | (void) temp; | |
940 | while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) ; | |
941 | ||
942 | uint32_t dma_start_time = GetCountSspClk() & 0xfffffff8; | |
943 | ||
944 | // Setup and start DMA. | |
945 | FpgaSetupSscDma(dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
946 | uint8_t *upTo = dmaBuf; | |
947 | ||
948 | for (;;) { | |
949 | uint16_t behindBy = ((uint8_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); | |
950 | ||
951 | if (behindBy == 0) continue; | |
952 | ||
953 | b = *upTo++; | |
954 | if (upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. | |
955 | upTo = dmaBuf; // start reading the circular buffer from the beginning | |
956 | if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { | |
957 | Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); | |
958 | break; | |
959 | } | |
960 | } | |
961 | if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. | |
962 | AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and | |
963 | AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers | |
964 | } | |
965 | ||
966 | for (int i = 7; i >= 0; i--) { | |
967 | if (Handle15693SampleFromReader((b >> i) & 0x01, &DecodeReader)) { | |
968 | *eof_time = dma_start_time + samples - DELAY_READER_TO_ARM_SIM; // end of EOF | |
969 | gotFrame = true; | |
970 | break; | |
971 | } | |
972 | samples++; | |
973 | } | |
974 | ||
975 | if (gotFrame) { | |
976 | break; | |
977 | } | |
978 | ||
979 | if (BUTTON_PRESS()) { | |
980 | DecodeReader.byteCount = -1; | |
981 | break; | |
982 | } | |
983 | ||
984 | WDT_HIT(); | |
985 | } | |
986 | ||
987 | FpgaDisableSscDma(); | |
988 | ||
989 | if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", | |
990 | samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount); | |
991 | ||
992 | if (DecodeReader.byteCount > 0) { | |
993 | uint32_t sof_time = *eof_time | |
994 | - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128:2048) // time for byte transfers | |
995 | - 32 // time for SOF transfer | |
996 | - 16; // time for EOF transfer | |
997 | LogTrace(DecodeReader.output, DecodeReader.byteCount, sof_time, *eof_time, NULL, true); | |
998 | } | |
999 | ||
1000 | return DecodeReader.byteCount; | |
1001 | } | |
1002 | ||
1003 | ||
1004 | // Encode (into the ToSend buffers) an identify request, which is the first | |
1005 | // thing that you must send to a tag to get a response. | |
1006 | static void BuildIdentifyRequest(void) | |
1007 | { | |
1008 | uint8_t cmd[5]; | |
1009 | ||
1010 | uint16_t crc; | |
1011 | // one sub-carrier, inventory, 1 slot, fast rate | |
1012 | // AFI is at bit 5 (1<<4) when doing an INVENTORY | |
1013 | cmd[0] = (1 << 2) | (1 << 5) | (1 << 1); | |
1014 | // inventory command code | |
1015 | cmd[1] = 0x01; | |
1016 | // no mask | |
1017 | cmd[2] = 0x00; | |
1018 | //Now the CRC | |
1019 | crc = Iso15693Crc(cmd, 3); | |
1020 | cmd[3] = crc & 0xff; | |
1021 | cmd[4] = crc >> 8; | |
1022 | ||
1023 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1024 | } | |
1025 | ||
1026 | ||
1027 | //----------------------------------------------------------------------------- | |
1028 | // Start to read an ISO 15693 tag. We send an identify request, then wait | |
1029 | // for the response. The response is not demodulated, just left in the buffer | |
1030 | // so that it can be downloaded to a PC and processed there. | |
1031 | //----------------------------------------------------------------------------- | |
1032 | void AcquireRawAdcSamplesIso15693(void) | |
1033 | { | |
1034 | LEDsoff(); | |
1035 | LED_A_ON(); | |
1036 | ||
1037 | uint8_t *dest = BigBuf_get_addr(); | |
1038 | ||
1039 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); | |
1040 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); | |
1041 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); | |
1042 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); | |
1043 | ||
1044 | BuildIdentifyRequest(); | |
1045 | ||
1046 | // Give the tags time to energize | |
1047 | LED_D_ON(); | |
1048 | SpinDelay(100); | |
1049 | ||
1050 | // Now send the command | |
1051 | TransmitTo15693Tag(ToSend, ToSendMax, 0); | |
1052 | ||
1053 | // wait for last transfer to complete | |
1054 | while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)) ; | |
1055 | ||
1056 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_SUBCARRIER_424_KHZ | FPGA_HF_READER_MODE_RECEIVE_AMPLITUDE); | |
1057 | ||
1058 | for(int c = 0; c < 4000; ) { | |
1059 | if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { | |
1060 | uint16_t r = AT91C_BASE_SSC->SSC_RHR; | |
1061 | dest[c++] = r >> 5; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1066 | LEDsoff(); | |
1067 | } | |
1068 | ||
1069 | ||
1070 | void SnoopIso15693(void) | |
1071 | { | |
1072 | LED_A_ON(); | |
1073 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); | |
1074 | BigBuf_free(); | |
1075 | ||
1076 | clear_trace(); | |
1077 | set_tracing(true); | |
1078 | ||
1079 | // The DMA buffer, used to stream samples from the FPGA | |
1080 | uint16_t* dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); | |
1081 | uint16_t *upTo; | |
1082 | ||
1083 | // Count of samples received so far, so that we can include timing | |
1084 | // information in the trace buffer. | |
1085 | int samples = 0; | |
1086 | ||
1087 | DecodeTag_t DecodeTag = {0}; | |
1088 | uint8_t response[ISO15693_MAX_RESPONSE_LENGTH]; | |
1089 | DecodeTagInit(&DecodeTag, response, sizeof(response)); | |
1090 | ||
1091 | DecodeReader_t DecodeReader = {0};; | |
1092 | uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; | |
1093 | DecodeReaderInit(&DecodeReader, cmd, sizeof(cmd)); | |
1094 | ||
1095 | // Print some debug information about the buffer sizes | |
1096 | if (DEBUG) { | |
1097 | Dbprintf("Snooping buffers initialized:"); | |
1098 | Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen()); | |
1099 | Dbprintf(" Reader -> tag: %i bytes", ISO15693_MAX_COMMAND_LENGTH); | |
1100 | Dbprintf(" tag -> Reader: %i bytes", ISO15693_MAX_RESPONSE_LENGTH); | |
1101 | Dbprintf(" DMA: %i bytes", ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t)); | |
1102 | } | |
1103 | Dbprintf("Snoop started. Press PM3 Button to stop."); | |
1104 | ||
1105 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE); | |
1106 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); | |
1107 | ||
1108 | // Setup for the DMA. | |
1109 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); | |
1110 | upTo = dmaBuf; | |
1111 | FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
1112 | ||
1113 | bool TagIsActive = false; | |
1114 | bool ReaderIsActive = false; | |
1115 | bool ExpectTagAnswer = false; | |
1116 | ||
1117 | // And now we loop, receiving samples. | |
1118 | for(;;) { | |
1119 | uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); | |
1120 | ||
1121 | if (behindBy == 0) continue; | |
1122 | ||
1123 | uint16_t snoopdata = *upTo++; | |
1124 | ||
1125 | if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. | |
1126 | upTo = dmaBuf; // start reading the circular buffer from the beginning | |
1127 | if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { | |
1128 | Dbprintf("About to blow circular buffer - aborted! behindBy=%d, samples=%d", behindBy, samples); | |
1129 | break; | |
1130 | } | |
1131 | if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. | |
1132 | AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and | |
1133 | AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers | |
1134 | WDT_HIT(); | |
1135 | if(BUTTON_PRESS()) { | |
1136 | DbpString("Snoop stopped."); | |
1137 | break; | |
1138 | } | |
1139 | } | |
1140 | } | |
1141 | samples++; | |
1142 | ||
1143 | if (!TagIsActive) { // no need to try decoding reader data if the tag is sending | |
1144 | if (Handle15693SampleFromReader(snoopdata & 0x02, &DecodeReader)) { | |
1145 | FpgaDisableSscDma(); | |
1146 | ExpectTagAnswer = true; | |
1147 | LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); | |
1148 | /* And ready to receive another command. */ | |
1149 | DecodeReaderReset(&DecodeReader); | |
1150 | /* And also reset the demod code, which might have been */ | |
1151 | /* false-triggered by the commands from the reader. */ | |
1152 | DecodeTagReset(&DecodeTag); | |
1153 | upTo = dmaBuf; | |
1154 | FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
1155 | } | |
1156 | if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) { | |
1157 | FpgaDisableSscDma(); | |
1158 | ExpectTagAnswer = true; | |
1159 | LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); | |
1160 | /* And ready to receive another command. */ | |
1161 | DecodeReaderReset(&DecodeReader); | |
1162 | /* And also reset the demod code, which might have been */ | |
1163 | /* false-triggered by the commands from the reader. */ | |
1164 | DecodeTagReset(&DecodeTag); | |
1165 | upTo = dmaBuf; | |
1166 | FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
1167 | } | |
1168 | ReaderIsActive = (DecodeReader.state >= STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF); | |
1169 | } | |
1170 | ||
1171 | if (!ReaderIsActive && ExpectTagAnswer) { // no need to try decoding tag data if the reader is currently sending or no answer expected yet | |
1172 | if (Handle15693SamplesFromTag(snoopdata >> 2, &DecodeTag)) { | |
1173 | FpgaDisableSscDma(); | |
1174 | //Use samples as a time measurement | |
1175 | LogTrace(DecodeTag.output, DecodeTag.len, samples, samples, NULL, false); | |
1176 | // And ready to receive another response. | |
1177 | DecodeTagReset(&DecodeTag); | |
1178 | DecodeReaderReset(&DecodeReader); | |
1179 | ExpectTagAnswer = false; | |
1180 | upTo = dmaBuf; | |
1181 | FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); | |
1182 | } | |
1183 | TagIsActive = (DecodeTag.state >= STATE_TAG_RECEIVING_DATA); | |
1184 | } | |
1185 | ||
1186 | } | |
1187 | ||
1188 | FpgaDisableSscDma(); | |
1189 | BigBuf_free(); | |
1190 | ||
1191 | LEDsoff(); | |
1192 | ||
1193 | DbpString("Snoop statistics:"); | |
1194 | Dbprintf(" ExpectTagAnswer: %d", ExpectTagAnswer); | |
1195 | Dbprintf(" DecodeTag State: %d", DecodeTag.state); | |
1196 | Dbprintf(" DecodeTag byteCnt: %d", DecodeTag.len); | |
1197 | Dbprintf(" DecodeReader State: %d", DecodeReader.state); | |
1198 | Dbprintf(" DecodeReader byteCnt: %d", DecodeReader.byteCount); | |
1199 | Dbprintf(" Trace length: %d", BigBuf_get_traceLen()); | |
1200 | } | |
1201 | ||
1202 | ||
1203 | // Initialize the proxmark as iso15k reader | |
1204 | static void Iso15693InitReader() { | |
1205 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); | |
1206 | // Setup SSC | |
1207 | // FpgaSetupSsc(); | |
1208 | ||
1209 | // Start from off (no field generated) | |
1210 | LED_D_OFF(); | |
1211 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1212 | SpinDelay(10); | |
1213 | ||
1214 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); | |
1215 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); | |
1216 | ||
1217 | // Give the tags time to energize | |
1218 | LED_D_ON(); | |
1219 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); | |
1220 | SpinDelay(250); | |
1221 | } | |
1222 | ||
1223 | /////////////////////////////////////////////////////////////////////// | |
1224 | // ISO 15693 Part 3 - Air Interface | |
1225 | // This section basically contains transmission and receiving of bits | |
1226 | /////////////////////////////////////////////////////////////////////// | |
1227 | ||
1228 | ||
1229 | // uid is in transmission order (which is reverse of display order) | |
1230 | static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) | |
1231 | { | |
1232 | uint8_t cmd[13]; | |
1233 | ||
1234 | uint16_t crc; | |
1235 | // If we set the Option_Flag in this request, the VICC will respond with the security status of the block | |
1236 | // followed by the block data | |
1237 | cmd[0] = ISO15693_REQ_OPTION | ISO15693_REQ_ADDRESS | ISO15693_REQ_DATARATE_HIGH; | |
1238 | // READ BLOCK command code | |
1239 | cmd[1] = ISO15693_READBLOCK; | |
1240 | // UID may be optionally specified here | |
1241 | // 64-bit UID | |
1242 | cmd[2] = uid[0]; | |
1243 | cmd[3] = uid[1]; | |
1244 | cmd[4] = uid[2]; | |
1245 | cmd[5] = uid[3]; | |
1246 | cmd[6] = uid[4]; | |
1247 | cmd[7] = uid[5]; | |
1248 | cmd[8] = uid[6]; | |
1249 | cmd[9] = uid[7]; // 0xe0; // always e0 (not exactly unique) | |
1250 | // Block number to read | |
1251 | cmd[10] = blockNumber; | |
1252 | //Now the CRC | |
1253 | crc = Iso15693Crc(cmd, 11); // the crc needs to be calculated over 11 bytes | |
1254 | cmd[11] = crc & 0xff; | |
1255 | cmd[12] = crc >> 8; | |
1256 | ||
1257 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1258 | } | |
1259 | ||
1260 | ||
1261 | // Now the VICC>VCD responses when we are simulating a tag | |
1262 | static void BuildInventoryResponse(uint8_t *uid) | |
1263 | { | |
1264 | uint8_t cmd[12]; | |
1265 | ||
1266 | uint16_t crc; | |
1267 | ||
1268 | cmd[0] = 0; // No error, no protocol format extension | |
1269 | cmd[1] = 0; // DSFID (data storage format identifier). 0x00 = not supported | |
1270 | // 64-bit UID | |
1271 | cmd[2] = uid[7]; //0x32; | |
1272 | cmd[3] = uid[6]; //0x4b; | |
1273 | cmd[4] = uid[5]; //0x03; | |
1274 | cmd[5] = uid[4]; //0x01; | |
1275 | cmd[6] = uid[3]; //0x00; | |
1276 | cmd[7] = uid[2]; //0x10; | |
1277 | cmd[8] = uid[1]; //0x05; | |
1278 | cmd[9] = uid[0]; //0xe0; | |
1279 | //Now the CRC | |
1280 | crc = Iso15693Crc(cmd, 10); | |
1281 | cmd[10] = crc & 0xff; | |
1282 | cmd[11] = crc >> 8; | |
1283 | ||
1284 | CodeIso15693AsTag(cmd, sizeof(cmd)); | |
1285 | } | |
1286 | ||
1287 | // Universal Method for sending to and recv bytes from a tag | |
1288 | // init ... should we initialize the reader? | |
1289 | // speed ... 0 low speed, 1 hi speed | |
1290 | // *recv will contain the tag's answer | |
1291 | // return: lenght of received data | |
1292 | int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t *recv, uint16_t max_recv_len, uint32_t start_time) { | |
1293 | ||
1294 | LED_A_ON(); | |
1295 | LED_B_OFF(); | |
1296 | LED_C_OFF(); | |
1297 | ||
1298 | if (init) Iso15693InitReader(); | |
1299 | ||
1300 | int answerLen=0; | |
1301 | ||
1302 | if (!speed) { | |
1303 | // low speed (1 out of 256) | |
1304 | CodeIso15693AsReader256(send, sendlen); | |
1305 | } else { | |
1306 | // high speed (1 out of 4) | |
1307 | CodeIso15693AsReader(send, sendlen); | |
1308 | } | |
1309 | ||
1310 | TransmitTo15693Tag(ToSend, ToSendMax, start_time); | |
1311 | ||
1312 | // Now wait for a response | |
1313 | if (recv != NULL) { | |
1314 | answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, DELAY_ISO15693_VCD_TO_VICC_READER * 2); | |
1315 | } | |
1316 | ||
1317 | LED_A_OFF(); | |
1318 | ||
1319 | return answerLen; | |
1320 | } | |
1321 | ||
1322 | ||
1323 | // -------------------------------------------------------------------- | |
1324 | // Debug Functions | |
1325 | // -------------------------------------------------------------------- | |
1326 | ||
1327 | // Decodes a message from a tag and displays its metadata and content | |
1328 | #define DBD15STATLEN 48 | |
1329 | void DbdecodeIso15693Answer(int len, uint8_t *d) { | |
1330 | char status[DBD15STATLEN+1]={0}; | |
1331 | uint16_t crc; | |
1332 | ||
1333 | if (len > 3) { | |
1334 | if (d[0] & ISO15693_RES_EXT) | |
1335 | strncat(status,"ProtExt ", DBD15STATLEN); | |
1336 | if (d[0] & ISO15693_RES_ERROR) { | |
1337 | // error | |
1338 | strncat(status,"Error ", DBD15STATLEN); | |
1339 | switch (d[1]) { | |
1340 | case 0x01: | |
1341 | strncat(status,"01:notSupp", DBD15STATLEN); | |
1342 | break; | |
1343 | case 0x02: | |
1344 | strncat(status,"02:notRecog", DBD15STATLEN); | |
1345 | break; | |
1346 | case 0x03: | |
1347 | strncat(status,"03:optNotSupp", DBD15STATLEN); | |
1348 | break; | |
1349 | case 0x0f: | |
1350 | strncat(status,"0f:noInfo", DBD15STATLEN); | |
1351 | break; | |
1352 | case 0x10: | |
1353 | strncat(status,"10:doesn'tExist", DBD15STATLEN); | |
1354 | break; | |
1355 | case 0x11: | |
1356 | strncat(status,"11:lockAgain", DBD15STATLEN); | |
1357 | break; | |
1358 | case 0x12: | |
1359 | strncat(status,"12:locked", DBD15STATLEN); | |
1360 | break; | |
1361 | case 0x13: | |
1362 | strncat(status,"13:progErr", DBD15STATLEN); | |
1363 | break; | |
1364 | case 0x14: | |
1365 | strncat(status,"14:lockErr", DBD15STATLEN); | |
1366 | break; | |
1367 | default: | |
1368 | strncat(status,"unknownErr", DBD15STATLEN); | |
1369 | } | |
1370 | strncat(status," ", DBD15STATLEN); | |
1371 | } else { | |
1372 | strncat(status,"NoErr ", DBD15STATLEN); | |
1373 | } | |
1374 | ||
1375 | crc=Iso15693Crc(d,len-2); | |
1376 | if ( (( crc & 0xff ) == d[len-2]) && (( crc >> 8 ) == d[len-1]) ) | |
1377 | strncat(status,"CrcOK",DBD15STATLEN); | |
1378 | else | |
1379 | strncat(status,"CrcFail!",DBD15STATLEN); | |
1380 | ||
1381 | Dbprintf("%s",status); | |
1382 | } | |
1383 | } | |
1384 | ||
1385 | ||
1386 | ||
1387 | /////////////////////////////////////////////////////////////////////// | |
1388 | // Functions called via USB/Client | |
1389 | /////////////////////////////////////////////////////////////////////// | |
1390 | ||
1391 | void SetDebugIso15693(uint32_t debug) { | |
1392 | DEBUG=debug; | |
1393 | Dbprintf("Iso15693 Debug is now %s",DEBUG?"on":"off"); | |
1394 | return; | |
1395 | } | |
1396 | ||
1397 | ||
1398 | //--------------------------------------------------------------------------------------- | |
1399 | // Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector. | |
1400 | // all demodulation performed in arm rather than host. - greg | |
1401 | //--------------------------------------------------------------------------------------- | |
1402 | void ReaderIso15693(uint32_t parameter) | |
1403 | { | |
1404 | LEDsoff(); | |
1405 | LED_A_ON(); | |
1406 | ||
1407 | set_tracing(true); | |
1408 | ||
1409 | int answerLen = 0; | |
1410 | uint8_t TagUID[8] = {0x00}; | |
1411 | ||
1412 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); | |
1413 | ||
1414 | uint8_t answer[ISO15693_MAX_RESPONSE_LENGTH]; | |
1415 | ||
1416 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); | |
1417 | // Setup SSC | |
1418 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); | |
1419 | ||
1420 | // Start from off (no field generated) | |
1421 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1422 | SpinDelay(200); | |
1423 | ||
1424 | // Give the tags time to energize | |
1425 | LED_D_ON(); | |
1426 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); | |
1427 | SpinDelay(200); | |
1428 | StartCountSspClk(); | |
1429 | ||
1430 | ||
1431 | // FIRST WE RUN AN INVENTORY TO GET THE TAG UID | |
1432 | // THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME | |
1433 | ||
1434 | // Now send the IDENTIFY command | |
1435 | BuildIdentifyRequest(); | |
1436 | TransmitTo15693Tag(ToSend, ToSendMax, 0); | |
1437 | ||
1438 | // Now wait for a response | |
1439 | answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC_READER * 2) ; | |
1440 | uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; | |
1441 | ||
1442 | if (answerLen >=12) // we should do a better check than this | |
1443 | { | |
1444 | TagUID[0] = answer[2]; | |
1445 | TagUID[1] = answer[3]; | |
1446 | TagUID[2] = answer[4]; | |
1447 | TagUID[3] = answer[5]; | |
1448 | TagUID[4] = answer[6]; | |
1449 | TagUID[5] = answer[7]; | |
1450 | TagUID[6] = answer[8]; // IC Manufacturer code | |
1451 | TagUID[7] = answer[9]; // always E0 | |
1452 | ||
1453 | } | |
1454 | ||
1455 | Dbprintf("%d octets read from IDENTIFY request:", answerLen); | |
1456 | DbdecodeIso15693Answer(answerLen, answer); | |
1457 | Dbhexdump(answerLen, answer, false); | |
1458 | ||
1459 | // UID is reverse | |
1460 | if (answerLen >= 12) | |
1461 | Dbprintf("UID = %02hX%02hX%02hX%02hX%02hX%02hX%02hX%02hX", | |
1462 | TagUID[7],TagUID[6],TagUID[5],TagUID[4], | |
1463 | TagUID[3],TagUID[2],TagUID[1],TagUID[0]); | |
1464 | ||
1465 | ||
1466 | // Dbprintf("%d octets read from SELECT request:", answerLen2); | |
1467 | // DbdecodeIso15693Answer(answerLen2,answer2); | |
1468 | // Dbhexdump(answerLen2,answer2,true); | |
1469 | ||
1470 | // Dbprintf("%d octets read from XXX request:", answerLen3); | |
1471 | // DbdecodeIso15693Answer(answerLen3,answer3); | |
1472 | // Dbhexdump(answerLen3,answer3,true); | |
1473 | ||
1474 | // read all pages | |
1475 | if (answerLen >= 12 && DEBUG) { | |
1476 | for (int i = 0; i < 32; i++) { // sanity check, assume max 32 pages | |
1477 | BuildReadBlockRequest(TagUID, i); | |
1478 | TransmitTo15693Tag(ToSend, ToSendMax, start_time); | |
1479 | int answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC_READER * 2); | |
1480 | start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; | |
1481 | if (answerLen > 0) { | |
1482 | Dbprintf("READ SINGLE BLOCK %d returned %d octets:", i, answerLen); | |
1483 | DbdecodeIso15693Answer(answerLen, answer); | |
1484 | Dbhexdump(answerLen, answer, false); | |
1485 | if ( *((uint32_t*) answer) == 0x07160101 ) break; // exit on NoPageErr | |
1486 | } | |
1487 | } | |
1488 | } | |
1489 | ||
1490 | // for the time being, switch field off to protect rdv4.0 | |
1491 | // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway | |
1492 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1493 | LED_D_OFF(); | |
1494 | ||
1495 | LED_A_OFF(); | |
1496 | } | |
1497 | ||
1498 | ||
1499 | // Simulate an ISO15693 TAG. | |
1500 | // For Inventory command: print command and send Inventory Response with given UID | |
1501 | // TODO: interpret other reader commands and send appropriate response | |
1502 | void SimTagIso15693(uint32_t parameter, uint8_t *uid) | |
1503 | { | |
1504 | LEDsoff(); | |
1505 | LED_A_ON(); | |
1506 | ||
1507 | FpgaDownloadAndGo(FPGA_BITSTREAM_HF); | |
1508 | SetAdcMuxFor(GPIO_MUXSEL_HIPKD); | |
1509 | FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); | |
1510 | FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR); | |
1511 | ||
1512 | StartCountSspClk(); | |
1513 | ||
1514 | uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; | |
1515 | ||
1516 | // Build a suitable response to the reader INVENTORY command | |
1517 | BuildInventoryResponse(uid); | |
1518 | ||
1519 | // Listen to reader | |
1520 | while (!BUTTON_PRESS()) { | |
1521 | uint32_t eof_time = 0, start_time = 0; | |
1522 | int cmd_len = GetIso15693CommandFromReader(cmd, sizeof(cmd), &eof_time); | |
1523 | ||
1524 | if ((cmd_len >= 5) && (cmd[0] & ISO15693_REQ_INVENTORY) && (cmd[1] == ISO15693_INVENTORY)) { // TODO: check more flags | |
1525 | bool slow = !(cmd[0] & ISO15693_REQ_DATARATE_HIGH); | |
1526 | start_time = eof_time + DELAY_ISO15693_VCD_TO_VICC_SIM - DELAY_ARM_TO_READER_SIM; | |
1527 | TransmitTo15693Reader(ToSend, ToSendMax, start_time, slow); | |
1528 | } | |
1529 | ||
1530 | Dbprintf("%d bytes read from reader:", cmd_len); | |
1531 | Dbhexdump(cmd_len, cmd, false); | |
1532 | } | |
1533 | ||
1534 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1535 | LEDsoff(); | |
1536 | } | |
1537 | ||
1538 | ||
1539 | // Since there is no standardized way of reading the AFI out of a tag, we will brute force it | |
1540 | // (some manufactures offer a way to read the AFI, though) | |
1541 | void BruteforceIso15693Afi(uint32_t speed) | |
1542 | { | |
1543 | LEDsoff(); | |
1544 | LED_A_ON(); | |
1545 | ||
1546 | uint8_t data[6]; | |
1547 | uint8_t recv[ISO15693_MAX_RESPONSE_LENGTH]; | |
1548 | ||
1549 | int datalen=0, recvlen=0; | |
1550 | ||
1551 | Iso15693InitReader(); | |
1552 | StartCountSspClk(); | |
1553 | ||
1554 | // first without AFI | |
1555 | // Tags should respond without AFI and with AFI=0 even when AFI is active | |
1556 | ||
1557 | data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_SLOT1; | |
1558 | data[1] = ISO15693_INVENTORY; | |
1559 | data[2] = 0; // mask length | |
1560 | datalen = Iso15693AddCrc(data,3); | |
1561 | recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), 0); | |
1562 | uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; | |
1563 | WDT_HIT(); | |
1564 | if (recvlen>=12) { | |
1565 | Dbprintf("NoAFI UID=%s", Iso15693sprintUID(NULL, &recv[2])); | |
1566 | } | |
1567 | ||
1568 | // now with AFI | |
1569 | ||
1570 | data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_AFI | ISO15693_REQINV_SLOT1; | |
1571 | data[1] = ISO15693_INVENTORY; | |
1572 | data[2] = 0; // AFI | |
1573 | data[3] = 0; // mask length | |
1574 | ||
1575 | for (int i = 0; i < 256; i++) { | |
1576 | data[2] = i & 0xFF; | |
1577 | datalen = Iso15693AddCrc(data,4); | |
1578 | recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time); | |
1579 | start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; | |
1580 | WDT_HIT(); | |
1581 | if (recvlen >= 12) { | |
1582 | Dbprintf("AFI=%i UID=%s", i, Iso15693sprintUID(NULL, &recv[2])); | |
1583 | } | |
1584 | } | |
1585 | Dbprintf("AFI Bruteforcing done."); | |
1586 | ||
1587 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1588 | LEDsoff(); | |
1589 | } | |
1590 | ||
1591 | // Allows to directly send commands to the tag via the client | |
1592 | void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint8_t data[]) { | |
1593 | ||
1594 | int recvlen = 0; | |
1595 | uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; | |
1596 | ||
1597 | LED_A_ON(); | |
1598 | ||
1599 | if (DEBUG) { | |
1600 | Dbprintf("SEND:"); | |
1601 | Dbhexdump(datalen, data, false); | |
1602 | } | |
1603 | ||
1604 | recvlen = SendDataTag(data, datalen, true, speed, (recv?recvbuf:NULL), sizeof(recvbuf), 0); | |
1605 | ||
1606 | if (recv) { | |
1607 | if (DEBUG) { | |
1608 | Dbprintf("RECV:"); | |
1609 | Dbhexdump(recvlen, recvbuf, false); | |
1610 | DbdecodeIso15693Answer(recvlen, recvbuf); | |
1611 | } | |
1612 | ||
1613 | cmd_send(CMD_ACK, recvlen>ISO15693_MAX_RESPONSE_LENGTH?ISO15693_MAX_RESPONSE_LENGTH:recvlen, 0, 0, recvbuf, ISO15693_MAX_RESPONSE_LENGTH); | |
1614 | ||
1615 | } | |
1616 | ||
1617 | // for the time being, switch field off to protect rdv4.0 | |
1618 | // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway | |
1619 | FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); | |
1620 | LED_D_OFF(); | |
1621 | ||
1622 | LED_A_OFF(); | |
1623 | } | |
1624 | ||
1625 | //----------------------------------------------------------------------------- | |
1626 | // Work with "magic Chinese" card. | |
1627 | // | |
1628 | //----------------------------------------------------------------------------- | |
1629 | ||
1630 | // Set the UID to the tag (based on Iceman work). | |
1631 | void SetTag15693Uid(uint8_t *uid) | |
1632 | { | |
1633 | uint8_t cmd[4][9] = {0x00}; | |
1634 | ||
1635 | uint16_t crc; | |
1636 | ||
1637 | int recvlen = 0; | |
1638 | uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; | |
1639 | ||
1640 | LED_A_ON(); | |
1641 | ||
1642 | // Command 1 : 02213E00000000 | |
1643 | cmd[0][0] = 0x02; | |
1644 | cmd[0][1] = 0x21; | |
1645 | cmd[0][2] = 0x3e; | |
1646 | cmd[0][3] = 0x00; | |
1647 | cmd[0][4] = 0x00; | |
1648 | cmd[0][5] = 0x00; | |
1649 | cmd[0][6] = 0x00; | |
1650 | ||
1651 | // Command 2 : 02213F69960000 | |
1652 | cmd[1][0] = 0x02; | |
1653 | cmd[1][1] = 0x21; | |
1654 | cmd[1][2] = 0x3f; | |
1655 | cmd[1][3] = 0x69; | |
1656 | cmd[1][4] = 0x96; | |
1657 | cmd[1][5] = 0x00; | |
1658 | cmd[1][6] = 0x00; | |
1659 | ||
1660 | // Command 3 : 022138u8u7u6u5 (where uX = uid byte X) | |
1661 | cmd[2][0] = 0x02; | |
1662 | cmd[2][1] = 0x21; | |
1663 | cmd[2][2] = 0x38; | |
1664 | cmd[2][3] = uid[7]; | |
1665 | cmd[2][4] = uid[6]; | |
1666 | cmd[2][5] = uid[5]; | |
1667 | cmd[2][6] = uid[4]; | |
1668 | ||
1669 | // Command 4 : 022139u4u3u2u1 (where uX = uid byte X) | |
1670 | cmd[3][0] = 0x02; | |
1671 | cmd[3][1] = 0x21; | |
1672 | cmd[3][2] = 0x39; | |
1673 | cmd[3][3] = uid[3]; | |
1674 | cmd[3][4] = uid[2]; | |
1675 | cmd[3][5] = uid[1]; | |
1676 | cmd[3][6] = uid[0]; | |
1677 | ||
1678 | for (int i=0; i<4; i++) { | |
1679 | // Add the CRC | |
1680 | crc = Iso15693Crc(cmd[i], 7); | |
1681 | cmd[i][7] = crc & 0xff; | |
1682 | cmd[i][8] = crc >> 8; | |
1683 | ||
1684 | if (DEBUG) { | |
1685 | Dbprintf("SEND:"); | |
1686 | Dbhexdump(sizeof(cmd[i]), cmd[i], false); | |
1687 | } | |
1688 | ||
1689 | recvlen = SendDataTag(cmd[i], sizeof(cmd[i]), true, 1, recvbuf, sizeof(recvbuf), 0); | |
1690 | ||
1691 | if (DEBUG) { | |
1692 | Dbprintf("RECV:"); | |
1693 | Dbhexdump(recvlen, recvbuf, false); | |
1694 | DbdecodeIso15693Answer(recvlen, recvbuf); | |
1695 | } | |
1696 | ||
1697 | cmd_send(CMD_ACK, recvlen>ISO15693_MAX_RESPONSE_LENGTH?ISO15693_MAX_RESPONSE_LENGTH:recvlen, 0, 0, recvbuf, ISO15693_MAX_RESPONSE_LENGTH); | |
1698 | } | |
1699 | ||
1700 | LED_D_OFF(); | |
1701 | ||
1702 | LED_A_OFF(); | |
1703 | } | |
1704 | ||
1705 | ||
1706 | ||
1707 | // -------------------------------------------------------------------- | |
1708 | // -- Misc & deprecated functions | |
1709 | // -------------------------------------------------------------------- | |
1710 | ||
1711 | /* | |
1712 | ||
1713 | // do not use; has a fix UID | |
1714 | static void __attribute__((unused)) BuildSysInfoRequest(uint8_t *uid) | |
1715 | { | |
1716 | uint8_t cmd[12]; | |
1717 | ||
1718 | uint16_t crc; | |
1719 | // If we set the Option_Flag in this request, the VICC will respond with the security status of the block | |
1720 | // followed by the block data | |
1721 | // one sub-carrier, inventory, 1 slot, fast rate | |
1722 | cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit | |
1723 | // System Information command code | |
1724 | cmd[1] = 0x2B; | |
1725 | // UID may be optionally specified here | |
1726 | // 64-bit UID | |
1727 | cmd[2] = 0x32; | |
1728 | cmd[3]= 0x4b; | |
1729 | cmd[4] = 0x03; | |
1730 | cmd[5] = 0x01; | |
1731 | cmd[6] = 0x00; | |
1732 | cmd[7] = 0x10; | |
1733 | cmd[8] = 0x05; | |
1734 | cmd[9]= 0xe0; // always e0 (not exactly unique) | |
1735 | //Now the CRC | |
1736 | crc = Iso15693Crc(cmd, 10); // the crc needs to be calculated over 2 bytes | |
1737 | cmd[10] = crc & 0xff; | |
1738 | cmd[11] = crc >> 8; | |
1739 | ||
1740 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1741 | } | |
1742 | ||
1743 | ||
1744 | // do not use; has a fix UID | |
1745 | static void __attribute__((unused)) BuildReadMultiBlockRequest(uint8_t *uid) | |
1746 | { | |
1747 | uint8_t cmd[14]; | |
1748 | ||
1749 | uint16_t crc; | |
1750 | // If we set the Option_Flag in this request, the VICC will respond with the security status of the block | |
1751 | // followed by the block data | |
1752 | // one sub-carrier, inventory, 1 slot, fast rate | |
1753 | cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit | |
1754 | // READ Multi BLOCK command code | |
1755 | cmd[1] = 0x23; | |
1756 | // UID may be optionally specified here | |
1757 | // 64-bit UID | |
1758 | cmd[2] = 0x32; | |
1759 | cmd[3]= 0x4b; | |
1760 | cmd[4] = 0x03; | |
1761 | cmd[5] = 0x01; | |
1762 | cmd[6] = 0x00; | |
1763 | cmd[7] = 0x10; | |
1764 | cmd[8] = 0x05; | |
1765 | cmd[9]= 0xe0; // always e0 (not exactly unique) | |
1766 | // First Block number to read | |
1767 | cmd[10] = 0x00; | |
1768 | // Number of Blocks to read | |
1769 | cmd[11] = 0x2f; // read quite a few | |
1770 | //Now the CRC | |
1771 | crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes | |
1772 | cmd[12] = crc & 0xff; | |
1773 | cmd[13] = crc >> 8; | |
1774 | ||
1775 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1776 | } | |
1777 | ||
1778 | // do not use; has a fix UID | |
1779 | static void __attribute__((unused)) BuildArbitraryRequest(uint8_t *uid,uint8_t CmdCode) | |
1780 | { | |
1781 | uint8_t cmd[14]; | |
1782 | ||
1783 | uint16_t crc; | |
1784 | // If we set the Option_Flag in this request, the VICC will respond with the security status of the block | |
1785 | // followed by the block data | |
1786 | // one sub-carrier, inventory, 1 slot, fast rate | |
1787 | cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit | |
1788 | // READ BLOCK command code | |
1789 | cmd[1] = CmdCode; | |
1790 | // UID may be optionally specified here | |
1791 | // 64-bit UID | |
1792 | cmd[2] = 0x32; | |
1793 | cmd[3]= 0x4b; | |
1794 | cmd[4] = 0x03; | |
1795 | cmd[5] = 0x01; | |
1796 | cmd[6] = 0x00; | |
1797 | cmd[7] = 0x10; | |
1798 | cmd[8] = 0x05; | |
1799 | cmd[9]= 0xe0; // always e0 (not exactly unique) | |
1800 | // Parameter | |
1801 | cmd[10] = 0x00; | |
1802 | cmd[11] = 0x0a; | |
1803 | ||
1804 | // cmd[12] = 0x00; | |
1805 | // cmd[13] = 0x00; //Now the CRC | |
1806 | crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes | |
1807 | cmd[12] = crc & 0xff; | |
1808 | cmd[13] = crc >> 8; | |
1809 | ||
1810 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1811 | } | |
1812 | ||
1813 | // do not use; has a fix UID | |
1814 | static void __attribute__((unused)) BuildArbitraryCustomRequest(uint8_t uid[], uint8_t CmdCode) | |
1815 | { | |
1816 | uint8_t cmd[14]; | |
1817 | ||
1818 | uint16_t crc; | |
1819 | // If we set the Option_Flag in this request, the VICC will respond with the security status of the block | |
1820 | // followed by the block data | |
1821 | // one sub-carrier, inventory, 1 slot, fast rate | |
1822 | cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit | |
1823 | // READ BLOCK command code | |
1824 | cmd[1] = CmdCode; | |
1825 | // UID may be optionally specified here | |
1826 | // 64-bit UID | |
1827 | cmd[2] = 0x32; | |
1828 | cmd[3]= 0x4b; | |
1829 | cmd[4] = 0x03; | |
1830 | cmd[5] = 0x01; | |
1831 | cmd[6] = 0x00; | |
1832 | cmd[7] = 0x10; | |
1833 | cmd[8] = 0x05; | |
1834 | cmd[9]= 0xe0; // always e0 (not exactly unique) | |
1835 | // Parameter | |
1836 | cmd[10] = 0x05; // for custom codes this must be manufacturer code | |
1837 | cmd[11] = 0x00; | |
1838 | ||
1839 | // cmd[12] = 0x00; | |
1840 | // cmd[13] = 0x00; //Now the CRC | |
1841 | crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes | |
1842 | cmd[12] = crc & 0xff; | |
1843 | cmd[13] = crc >> 8; | |
1844 | ||
1845 | CodeIso15693AsReader(cmd, sizeof(cmd)); | |
1846 | } | |
1847 | ||
1848 | ||
1849 | ||
1850 | ||
1851 | */ | |
1852 | ||
1853 |