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Paradox clone functionality implemented (#747)
[proxmark3-svn] / armsrc / lfops.c
1 //-----------------------------------------------------------------------------
2 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
3 // at your option, any later version. See the LICENSE.txt file for the text of
4 // the license.
5 //-----------------------------------------------------------------------------
6 // Miscellaneous routines for low frequency tag operations.
7 // Tags supported here so far are Texas Instruments (TI), HID, EM4x05, EM410x
8 // Also routines for raw mode reading/simulating of LF waveform
9 //-----------------------------------------------------------------------------
10
11 #include "proxmark3.h"
12 #include "apps.h"
13 #include "util.h"
14 #include "hitag2.h"
15 #include "crc16.h"
16 #include "string.h"
17 #include "lfdemod.h"
18 #include "lfsampling.h"
19 #include "protocols.h"
20 #include "usb_cdc.h" // for usb_poll_validate_length
21
22 /**
23 * Function to do a modulation and then get samples.
24 * @param delay_off
25 * @param period_0
26 * @param period_1
27 * @param command
28 */
29 void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint32_t period_1, uint8_t *command)
30 {
31 // start timer
32 StartTicks();
33
34 // use lf config settings
35 sample_config *sc = getSamplingConfig();
36
37 // Make sure the tag is reset
38 FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
39 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
40 WaitMS(2500);
41
42 // clear read buffer (after fpga bitstream loaded...)
43 BigBuf_Clear_keep_EM();
44
45 // power on
46 LFSetupFPGAForADC(sc->divisor, 1);
47
48 // And a little more time for the tag to fully power up
49 WaitMS(2000);
50 // if delay_off = 0 then just bitbang 1 = antenna on 0 = off for respective periods.
51 bool bitbang = delay_off == 0;
52 // now modulate the reader field
53
54 if (bitbang) {
55 // HACK it appears the loop and if statements take up about 7us so adjust waits accordingly...
56 uint8_t hack_cnt = 7;
57 if (period_0 < hack_cnt || period_1 < hack_cnt) {
58 DbpString("Warning periods cannot be less than 7us in bit bang mode");
59 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
60 LED_D_OFF();
61 return;
62 }
63
64 // hack2 needed--- it appears to take about 8-16us to turn the antenna back on
65 // leading to ~ 1 to 2 125khz samples extra in every off period
66 // so we should test for last 0 before next 1 and reduce period_0 by this extra amount...
67 // but is this time different for every antenna or other hw builds??? more testing needed
68
69 // prime cmd_len to save time comparing strings while modulating
70 int cmd_len = 0;
71 while(command[cmd_len] != '\0' && command[cmd_len] != ' ')
72 cmd_len++;
73
74 int counter = 0;
75 bool off = false;
76 for (counter = 0; counter < cmd_len; counter++) {
77 // if cmd = 0 then turn field off
78 if (command[counter] == '0') {
79 // if field already off leave alone (affects timing otherwise)
80 if (off == false) {
81 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
82 LED_D_OFF();
83 off = true;
84 }
85 // note we appear to take about 7us to switch over (or run the if statements/loop...)
86 WaitUS(period_0-hack_cnt);
87 // else if cmd = 1 then turn field on
88 } else {
89 // if field already on leave alone (affects timing otherwise)
90 if (off) {
91 FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
92 LED_D_ON();
93 off = false;
94 }
95 // note we appear to take about 7us to switch over (or run the if statements/loop...)
96 WaitUS(period_1-hack_cnt);
97 }
98 }
99 } else { // old mode of cmd read using delay as off period
100 while(*command != '\0' && *command != ' ') {
101 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
102 LED_D_OFF();
103 WaitUS(delay_off);
104 FpgaSendCommand(FPGA_CMD_SET_DIVISOR, sc->divisor);
105 FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
106 LED_D_ON();
107 if(*(command++) == '0') {
108 WaitUS(period_0);
109 } else {
110 WaitUS(period_1);
111 }
112 }
113 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
114 LED_D_OFF();
115 WaitUS(delay_off);
116 FpgaSendCommand(FPGA_CMD_SET_DIVISOR, sc->divisor);
117 }
118
119 FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
120
121 // now do the read
122 DoAcquisition_config(false, 0);
123
124 // Turn off antenna
125 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
126 // tell client we are done
127 cmd_send(CMD_ACK,0,0,0,0,0);
128 }
129
130 /* blank r/w tag data stream
131 ...0000000000000000 01111111
132 1010101010101010101010101010101010101010101010101010101010101010
133 0011010010100001
134 01111111
135 101010101010101[0]000...
136
137 [5555fe852c5555555555555555fe0000]
138 */
139 void ReadTItag(void)
140 {
141 // some hardcoded initial params
142 // when we read a TI tag we sample the zerocross line at 2Mhz
143 // TI tags modulate a 1 as 16 cycles of 123.2Khz
144 // TI tags modulate a 0 as 16 cycles of 134.2Khz
145 #define FSAMPLE 2000000
146 #define FREQLO 123200
147 #define FREQHI 134200
148
149 signed char *dest = (signed char *)BigBuf_get_addr();
150 uint16_t n = BigBuf_max_traceLen();
151 // 128 bit shift register [shift3:shift2:shift1:shift0]
152 uint32_t shift3 = 0, shift2 = 0, shift1 = 0, shift0 = 0;
153
154 int i, cycles=0, samples=0;
155 // how many sample points fit in 16 cycles of each frequency
156 uint32_t sampleslo = (FSAMPLE<<4)/FREQLO, sampleshi = (FSAMPLE<<4)/FREQHI;
157 // when to tell if we're close enough to one freq or another
158 uint32_t threshold = (sampleslo - sampleshi + 1)>>1;
159
160 // TI tags charge at 134.2Khz
161 FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
162 FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz
163
164 // Place FPGA in passthrough mode, in this mode the CROSS_LO line
165 // connects to SSP_DIN and the SSP_DOUT logic level controls
166 // whether we're modulating the antenna (high)
167 // or listening to the antenna (low)
168 FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);
169
170 // get TI tag data into the buffer
171 AcquireTiType();
172
173 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
174
175 for (i=0; i<n-1; i++) {
176 // count cycles by looking for lo to hi zero crossings
177 if ( (dest[i]<0) && (dest[i+1]>0) ) {
178 cycles++;
179 // after 16 cycles, measure the frequency
180 if (cycles>15) {
181 cycles=0;
182 samples=i-samples; // number of samples in these 16 cycles
183
184 // TI bits are coming to us lsb first so shift them
185 // right through our 128 bit right shift register
186 shift0 = (shift0>>1) | (shift1 << 31);
187 shift1 = (shift1>>1) | (shift2 << 31);
188 shift2 = (shift2>>1) | (shift3 << 31);
189 shift3 >>= 1;
190
191 // check if the cycles fall close to the number
192 // expected for either the low or high frequency
193 if ( (samples>(sampleslo-threshold)) && (samples<(sampleslo+threshold)) ) {
194 // low frequency represents a 1
195 shift3 |= (1<<31);
196 } else if ( (samples>(sampleshi-threshold)) && (samples<(sampleshi+threshold)) ) {
197 // high frequency represents a 0
198 } else {
199 // probably detected a gay waveform or noise
200 // use this as gaydar or discard shift register and start again
201 shift3 = shift2 = shift1 = shift0 = 0;
202 }
203 samples = i;
204
205 // for each bit we receive, test if we've detected a valid tag
206
207 // if we see 17 zeroes followed by 6 ones, we might have a tag
208 // remember the bits are backwards
209 if ( ((shift0 & 0x7fffff) == 0x7e0000) ) {
210 // if start and end bytes match, we have a tag so break out of the loop
211 if ( ((shift0>>16)&0xff) == ((shift3>>8)&0xff) ) {
212 cycles = 0xF0B; //use this as a flag (ugly but whatever)
213 break;
214 }
215 }
216 }
217 }
218 }
219
220 // if flag is set we have a tag
221 if (cycles!=0xF0B) {
222 DbpString("Info: No valid tag detected.");
223 } else {
224 // put 64 bit data into shift1 and shift0
225 shift0 = (shift0>>24) | (shift1 << 8);
226 shift1 = (shift1>>24) | (shift2 << 8);
227
228 // align 16 bit crc into lower half of shift2
229 shift2 = ((shift2>>24) | (shift3 << 8)) & 0x0ffff;
230
231 // if r/w tag, check ident match
232 if (shift3 & (1<<15) ) {
233 DbpString("Info: TI tag is rewriteable");
234 // only 15 bits compare, last bit of ident is not valid
235 if (((shift3 >> 16) ^ shift0) & 0x7fff ) {
236 DbpString("Error: Ident mismatch!");
237 } else {
238 DbpString("Info: TI tag ident is valid");
239 }
240 } else {
241 DbpString("Info: TI tag is readonly");
242 }
243
244 // WARNING the order of the bytes in which we calc crc below needs checking
245 // i'm 99% sure the crc algorithm is correct, but it may need to eat the
246 // bytes in reverse or something
247 // calculate CRC
248 uint32_t crc=0;
249
250 crc = update_crc16(crc, (shift0)&0xff);
251 crc = update_crc16(crc, (shift0>>8)&0xff);
252 crc = update_crc16(crc, (shift0>>16)&0xff);
253 crc = update_crc16(crc, (shift0>>24)&0xff);
254 crc = update_crc16(crc, (shift1)&0xff);
255 crc = update_crc16(crc, (shift1>>8)&0xff);
256 crc = update_crc16(crc, (shift1>>16)&0xff);
257 crc = update_crc16(crc, (shift1>>24)&0xff);
258
259 Dbprintf("Info: Tag data: %x%08x, crc=%x",
260 (unsigned int)shift1, (unsigned int)shift0, (unsigned int)shift2 & 0xFFFF);
261 if (crc != (shift2&0xffff)) {
262 Dbprintf("Error: CRC mismatch, expected %x", (unsigned int)crc);
263 } else {
264 DbpString("Info: CRC is good");
265 }
266 }
267 }
268
269 void WriteTIbyte(uint8_t b)
270 {
271 int i = 0;
272
273 // modulate 8 bits out to the antenna
274 for (i=0; i<8; i++)
275 {
276 if (b&(1<<i)) {
277 // stop modulating antenna
278 LOW(GPIO_SSC_DOUT);
279 SpinDelayUs(1000);
280 // modulate antenna
281 HIGH(GPIO_SSC_DOUT);
282 SpinDelayUs(1000);
283 } else {
284 // stop modulating antenna
285 LOW(GPIO_SSC_DOUT);
286 SpinDelayUs(300);
287 // modulate antenna
288 HIGH(GPIO_SSC_DOUT);
289 SpinDelayUs(1700);
290 }
291 }
292 }
293
294 void AcquireTiType(void)
295 {
296 int i, j, n;
297 // tag transmission is <20ms, sampling at 2M gives us 40K samples max
298 // each sample is 1 bit stuffed into a uint32_t so we need 1250 uint32_t
299 #define TIBUFLEN 1250
300
301 // clear buffer
302 uint32_t *BigBuf = (uint32_t *)BigBuf_get_addr();
303 BigBuf_Clear_ext(false);
304
305 // Set up the synchronous serial port
306 AT91C_BASE_PIOA->PIO_PDR = GPIO_SSC_DIN;
307 AT91C_BASE_PIOA->PIO_ASR = GPIO_SSC_DIN;
308
309 // steal this pin from the SSP and use it to control the modulation
310 AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
311 AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
312
313 AT91C_BASE_SSC->SSC_CR = AT91C_SSC_SWRST;
314 AT91C_BASE_SSC->SSC_CR = AT91C_SSC_RXEN | AT91C_SSC_TXEN;
315
316 // Sample at 2 Mbit/s, so TI tags are 16.2 vs. 14.9 clocks long
317 // 48/2 = 24 MHz clock must be divided by 12
318 AT91C_BASE_SSC->SSC_CMR = 12;
319
320 AT91C_BASE_SSC->SSC_RCMR = SSC_CLOCK_MODE_SELECT(0);
321 AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(32) | AT91C_SSC_MSBF;
322 AT91C_BASE_SSC->SSC_TCMR = 0;
323 AT91C_BASE_SSC->SSC_TFMR = 0;
324
325 LED_D_ON();
326
327 // modulate antenna
328 HIGH(GPIO_SSC_DOUT);
329
330 // Charge TI tag for 50ms.
331 SpinDelay(50);
332
333 // stop modulating antenna and listen
334 LOW(GPIO_SSC_DOUT);
335
336 LED_D_OFF();
337
338 i = 0;
339 for(;;) {
340 if(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
341 BigBuf[i] = AT91C_BASE_SSC->SSC_RHR; // store 32 bit values in buffer
342 i++; if(i >= TIBUFLEN) break;
343 }
344 WDT_HIT();
345 }
346
347 // return stolen pin to SSP
348 AT91C_BASE_PIOA->PIO_PDR = GPIO_SSC_DOUT;
349 AT91C_BASE_PIOA->PIO_ASR = GPIO_SSC_DIN | GPIO_SSC_DOUT;
350
351 char *dest = (char *)BigBuf_get_addr();
352 n = TIBUFLEN*32;
353 // unpack buffer
354 for (i=TIBUFLEN-1; i>=0; i--) {
355 for (j=0; j<32; j++) {
356 if(BigBuf[i] & (1 << j)) {
357 dest[--n] = 1;
358 } else {
359 dest[--n] = -1;
360 }
361 }
362 }
363 }
364
365 // arguments: 64bit data split into 32bit idhi:idlo and optional 16bit crc
366 // if crc provided, it will be written with the data verbatim (even if bogus)
367 // if not provided a valid crc will be computed from the data and written.
368 void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)
369 {
370 FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
371 if(crc == 0) {
372 crc = update_crc16(crc, (idlo)&0xff);
373 crc = update_crc16(crc, (idlo>>8)&0xff);
374 crc = update_crc16(crc, (idlo>>16)&0xff);
375 crc = update_crc16(crc, (idlo>>24)&0xff);
376 crc = update_crc16(crc, (idhi)&0xff);
377 crc = update_crc16(crc, (idhi>>8)&0xff);
378 crc = update_crc16(crc, (idhi>>16)&0xff);
379 crc = update_crc16(crc, (idhi>>24)&0xff);
380 }
381 Dbprintf("Writing to tag: %x%08x, crc=%x",
382 (unsigned int) idhi, (unsigned int) idlo, crc);
383
384 // TI tags charge at 134.2Khz
385 FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz
386 // Place FPGA in passthrough mode, in this mode the CROSS_LO line
387 // connects to SSP_DIN and the SSP_DOUT logic level controls
388 // whether we're modulating the antenna (high)
389 // or listening to the antenna (low)
390 FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);
391 LED_A_ON();
392
393 // steal this pin from the SSP and use it to control the modulation
394 AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
395 AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
396
397 // writing algorithm:
398 // a high bit consists of a field off for 1ms and field on for 1ms
399 // a low bit consists of a field off for 0.3ms and field on for 1.7ms
400 // initiate a charge time of 50ms (field on) then immediately start writing bits
401 // start by writing 0xBB (keyword) and 0xEB (password)
402 // then write 80 bits of data (or 64 bit data + 16 bit crc if you prefer)
403 // finally end with 0x0300 (write frame)
404 // all data is sent lsb firts
405 // finish with 15ms programming time
406
407 // modulate antenna
408 HIGH(GPIO_SSC_DOUT);
409 SpinDelay(50); // charge time
410
411 WriteTIbyte(0xbb); // keyword
412 WriteTIbyte(0xeb); // password
413 WriteTIbyte( (idlo )&0xff );
414 WriteTIbyte( (idlo>>8 )&0xff );
415 WriteTIbyte( (idlo>>16)&0xff );
416 WriteTIbyte( (idlo>>24)&0xff );
417 WriteTIbyte( (idhi )&0xff );
418 WriteTIbyte( (idhi>>8 )&0xff );
419 WriteTIbyte( (idhi>>16)&0xff );
420 WriteTIbyte( (idhi>>24)&0xff ); // data hi to lo
421 WriteTIbyte( (crc )&0xff ); // crc lo
422 WriteTIbyte( (crc>>8 )&0xff ); // crc hi
423 WriteTIbyte(0x00); // write frame lo
424 WriteTIbyte(0x03); // write frame hi
425 HIGH(GPIO_SSC_DOUT);
426 SpinDelay(50); // programming time
427
428 LED_A_OFF();
429
430 // get TI tag data into the buffer
431 AcquireTiType();
432
433 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
434 DbpString("Now use `lf ti read` to check");
435 }
436
437 void SimulateTagLowFrequency(int period, int gap, int ledcontrol)
438 {
439 int i;
440 uint8_t *tab = BigBuf_get_addr();
441
442 //note FpgaDownloadAndGo destroys the bigbuf so be sure this is called before now...
443 //FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
444 FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
445
446 AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT | GPIO_SSC_CLK;
447
448 AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
449 AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_CLK;
450
451 #define SHORT_COIL() LOW(GPIO_SSC_DOUT)
452 #define OPEN_COIL() HIGH(GPIO_SSC_DOUT)
453
454 i = 0;
455 for(;;) {
456 //wait until SSC_CLK goes HIGH
457 int ii = 0;
458 while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)) {
459 //only check every 1000th time (usb_poll_validate_length on some systems was too slow)
460 if ( ii == 1000 ) {
461 if (BUTTON_PRESS() || usb_poll_validate_length() ) {
462 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
463 DbpString("Stopped");
464 return;
465 }
466 ii=0;
467 }
468 WDT_HIT();
469 ii++;
470 }
471 if (ledcontrol)
472 LED_D_ON();
473
474 if(tab[i])
475 OPEN_COIL();
476 else
477 SHORT_COIL();
478
479 if (ledcontrol)
480 LED_D_OFF();
481 ii=0;
482 //wait until SSC_CLK goes LOW
483 while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK) {
484 //only check every 1000th time (usb_poll_validate_length on some systems was too slow)
485 if ( ii == 1000 ) {
486 if (BUTTON_PRESS() || usb_poll_validate_length() ) {
487 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
488 DbpString("Stopped");
489 return;
490 }
491 ii=0;
492 }
493 WDT_HIT();
494 ii++;
495 }
496
497 i++;
498 if(i == period) {
499
500 i = 0;
501 if (gap) {
502 SHORT_COIL();
503 SpinDelayUs(gap);
504 }
505 }
506
507 }
508 }
509
510 #define DEBUG_FRAME_CONTENTS 1
511 void SimulateTagLowFrequencyBidir(int divisor, int t0)
512 {
513 }
514
515 // compose fc/8 fc/10 waveform (FSK2)
516 static void fc(int c, int *n)
517 {
518 uint8_t *dest = BigBuf_get_addr();
519 int idx;
520
521 // for when we want an fc8 pattern every 4 logical bits
522 if(c==0) {
523 dest[((*n)++)]=1;
524 dest[((*n)++)]=1;
525 dest[((*n)++)]=1;
526 dest[((*n)++)]=1;
527 dest[((*n)++)]=0;
528 dest[((*n)++)]=0;
529 dest[((*n)++)]=0;
530 dest[((*n)++)]=0;
531 }
532
533 // an fc/8 encoded bit is a bit pattern of 11110000 x6 = 48 samples
534 if(c==8) {
535 for (idx=0; idx<6; idx++) {
536 dest[((*n)++)]=1;
537 dest[((*n)++)]=1;
538 dest[((*n)++)]=1;
539 dest[((*n)++)]=1;
540 dest[((*n)++)]=0;
541 dest[((*n)++)]=0;
542 dest[((*n)++)]=0;
543 dest[((*n)++)]=0;
544 }
545 }
546
547 // an fc/10 encoded bit is a bit pattern of 1111100000 x5 = 50 samples
548 if(c==10) {
549 for (idx=0; idx<5; idx++) {
550 dest[((*n)++)]=1;
551 dest[((*n)++)]=1;
552 dest[((*n)++)]=1;
553 dest[((*n)++)]=1;
554 dest[((*n)++)]=1;
555 dest[((*n)++)]=0;
556 dest[((*n)++)]=0;
557 dest[((*n)++)]=0;
558 dest[((*n)++)]=0;
559 dest[((*n)++)]=0;
560 }
561 }
562 }
563 // compose fc/X fc/Y waveform (FSKx)
564 static void fcAll(uint8_t fc, int *n, uint8_t clock, uint16_t *modCnt)
565 {
566 uint8_t *dest = BigBuf_get_addr();
567 uint8_t halfFC = fc/2;
568 uint8_t wavesPerClock = clock/fc;
569 uint8_t mod = clock % fc; //modifier
570 uint8_t modAdj = fc/mod; //how often to apply modifier
571 bool modAdjOk = !(fc % mod); //if (fc % mod==0) modAdjOk=true;
572 // loop through clock - step field clock
573 for (uint8_t idx=0; idx < wavesPerClock; idx++){
574 // put 1/2 FC length 1's and 1/2 0's per field clock wave (to create the wave)
575 memset(dest+(*n), 0, fc-halfFC); //in case of odd number use extra here
576 memset(dest+(*n)+(fc-halfFC), 1, halfFC);
577 *n += fc;
578 }
579 if (mod>0) (*modCnt)++;
580 if ((mod>0) && modAdjOk){ //fsk2
581 if ((*modCnt % modAdj) == 0){ //if 4th 8 length wave in a rf/50 add extra 8 length wave
582 memset(dest+(*n), 0, fc-halfFC);
583 memset(dest+(*n)+(fc-halfFC), 1, halfFC);
584 *n += fc;
585 }
586 }
587 if (mod>0 && !modAdjOk){ //fsk1
588 memset(dest+(*n), 0, mod-(mod/2));
589 memset(dest+(*n)+(mod-(mod/2)), 1, mod/2);
590 *n += mod;
591 }
592 }
593
594 // prepare a waveform pattern in the buffer based on the ID given then
595 // simulate a HID tag until the button is pressed
596 void CmdHIDsimTAG(int hi2, int hi, int lo, int ledcontrol)
597 {
598 int n=0, i=0;
599 /*
600 HID tag bitstream format
601 The tag contains a 44bit unique code. This is sent out MSB first in sets of 4 bits
602 A 1 bit is represented as 6 fc8 and 5 fc10 patterns
603 A 0 bit is represented as 5 fc10 and 6 fc8 patterns
604 A fc8 is inserted before every 4 bits
605 A special start of frame pattern is used consisting a0b0 where a and b are neither 0
606 nor 1 bits, they are special patterns (a = set of 12 fc8 and b = set of 10 fc10)
607 */
608
609 if (hi2>0x0FFFFFFF) {
610 DbpString("Tags can only have 44 or 84 bits. - USE lf simfsk for larger tags");
611 return;
612 }
613 // set LF so we don't kill the bigbuf we are setting with simulation data.
614 FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
615
616 fc(0,&n);
617 // special start of frame marker containing invalid bit sequences
618 fc(8, &n); fc(8, &n); // invalid
619 fc(8, &n); fc(10, &n); // logical 0
620 fc(10, &n); fc(10, &n); // invalid
621 fc(8, &n); fc(10, &n); // logical 0
622
623 WDT_HIT();
624 if (hi2 > 0 || hi > 0xFFF){
625 // manchester encode bits 91 to 64 (91-84 are part of the header)
626 for (i=27; i>=0; i--) {
627 if ((i%4)==3) fc(0,&n);
628 if ((hi2>>i)&1) {
629 fc(10, &n); fc(8, &n); // low-high transition
630 } else {
631 fc(8, &n); fc(10, &n); // high-low transition
632 }
633 }
634 WDT_HIT();
635 // manchester encode bits 63 to 32
636 for (i=31; i>=0; i--) {
637 if ((i%4)==3) fc(0,&n);
638 if ((hi>>i)&1) {
639 fc(10, &n); fc(8, &n); // low-high transition
640 } else {
641 fc(8, &n); fc(10, &n); // high-low transition
642 }
643 }
644 } else {
645 // manchester encode bits 43 to 32
646 for (i=11; i>=0; i--) {
647 if ((i%4)==3) fc(0,&n);
648 if ((hi>>i)&1) {
649 fc(10, &n); fc(8, &n); // low-high transition
650 } else {
651 fc(8, &n); fc(10, &n); // high-low transition
652 }
653 }
654 }
655
656 WDT_HIT();
657 // manchester encode bits 31 to 0
658 for (i=31; i>=0; i--) {
659 if ((i%4)==3) fc(0,&n);
660 if ((lo>>i)&1) {
661 fc(10, &n); fc(8, &n); // low-high transition
662 } else {
663 fc(8, &n); fc(10, &n); // high-low transition
664 }
665 }
666
667 if (ledcontrol)
668 LED_A_ON();
669 SimulateTagLowFrequency(n, 0, ledcontrol);
670
671 if (ledcontrol)
672 LED_A_OFF();
673 }
674
675 // prepare a waveform pattern in the buffer based on the ID given then
676 // simulate a FSK tag until the button is pressed
677 // arg1 contains fcHigh and fcLow, arg2 contains invert and clock
678 void CmdFSKsimTAG(uint16_t arg1, uint16_t arg2, size_t size, uint8_t *BitStream)
679 {
680 int ledcontrol=1;
681 int n=0, i=0;
682 uint8_t fcHigh = arg1 >> 8;
683 uint8_t fcLow = arg1 & 0xFF;
684 uint16_t modCnt = 0;
685 uint8_t clk = arg2 & 0xFF;
686 uint8_t invert = (arg2 >> 8) & 1;
687
688 // set LF so we don't kill the bigbuf we are setting with simulation data.
689 FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
690
691 for (i=0; i<size; i++){
692 if (BitStream[i] == invert){
693 fcAll(fcLow, &n, clk, &modCnt);
694 } else {
695 fcAll(fcHigh, &n, clk, &modCnt);
696 }
697 }
698 Dbprintf("Simulating with fcHigh: %d, fcLow: %d, clk: %d, invert: %d, n: %d",fcHigh, fcLow, clk, invert, n);
699 /*Dbprintf("DEBUG: First 32:");
700 uint8_t *dest = BigBuf_get_addr();
701 i=0;
702 Dbprintf("%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d", dest[i],dest[i+1],dest[i+2],dest[i+3],dest[i+4],dest[i+5],dest[i+6],dest[i+7],dest[i+8],dest[i+9],dest[i+10],dest[i+11],dest[i+12],dest[i+13],dest[i+14],dest[i+15]);
703 i+=16;
704 Dbprintf("%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d", dest[i],dest[i+1],dest[i+2],dest[i+3],dest[i+4],dest[i+5],dest[i+6],dest[i+7],dest[i+8],dest[i+9],dest[i+10],dest[i+11],dest[i+12],dest[i+13],dest[i+14],dest[i+15]);
705 */
706 if (ledcontrol)
707 LED_A_ON();
708
709 SimulateTagLowFrequency(n, 0, ledcontrol);
710
711 if (ledcontrol)
712 LED_A_OFF();
713 }
714
715 // compose ask waveform for one bit(ASK)
716 static void askSimBit(uint8_t c, int *n, uint8_t clock, uint8_t manchester)
717 {
718 uint8_t *dest = BigBuf_get_addr();
719 uint8_t halfClk = clock/2;
720 // c = current bit 1 or 0
721 if (manchester==1){
722 memset(dest+(*n), c, halfClk);
723 memset(dest+(*n) + halfClk, c^1, halfClk);
724 } else {
725 memset(dest+(*n), c, clock);
726 }
727 *n += clock;
728 }
729
730 static void biphaseSimBit(uint8_t c, int *n, uint8_t clock, uint8_t *phase)
731 {
732 uint8_t *dest = BigBuf_get_addr();
733 uint8_t halfClk = clock/2;
734 if (c){
735 memset(dest+(*n), c ^ 1 ^ *phase, halfClk);
736 memset(dest+(*n) + halfClk, c ^ *phase, halfClk);
737 } else {
738 memset(dest+(*n), c ^ *phase, clock);
739 *phase ^= 1;
740 }
741 *n += clock;
742 }
743
744 static void stAskSimBit(int *n, uint8_t clock) {
745 uint8_t *dest = BigBuf_get_addr();
746 uint8_t halfClk = clock/2;
747 //ST = .5 high .5 low 1.5 high .5 low 1 high
748 memset(dest+(*n), 1, halfClk);
749 memset(dest+(*n) + halfClk, 0, halfClk);
750 memset(dest+(*n) + clock, 1, clock + halfClk);
751 memset(dest+(*n) + clock*2 + halfClk, 0, halfClk);
752 memset(dest+(*n) + clock*3, 1, clock);
753 *n += clock*4;
754 }
755
756 // args clock, ask/man or askraw, invert, transmission separator
757 void CmdASKsimTag(uint16_t arg1, uint16_t arg2, size_t size, uint8_t *BitStream)
758 {
759 int ledcontrol = 1;
760 int n=0, i=0;
761 uint8_t clk = (arg1 >> 8) & 0xFF;
762 uint8_t encoding = arg1 & 0xFF;
763 uint8_t separator = arg2 & 1;
764 uint8_t invert = (arg2 >> 8) & 1;
765
766 // set LF so we don't kill the bigbuf we are setting with simulation data.
767 FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
768
769 if (encoding==2){ //biphase
770 uint8_t phase=0;
771 for (i=0; i<size; i++){
772 biphaseSimBit(BitStream[i]^invert, &n, clk, &phase);
773 }
774 if (phase==1) { //run a second set inverted to keep phase in check
775 for (i=0; i<size; i++){
776 biphaseSimBit(BitStream[i]^invert, &n, clk, &phase);
777 }
778 }
779 } else { // ask/manchester || ask/raw
780 for (i=0; i<size; i++){
781 askSimBit(BitStream[i]^invert, &n, clk, encoding);
782 }
783 if (encoding==0 && BitStream[0]==BitStream[size-1]){ //run a second set inverted (for ask/raw || biphase phase)
784 for (i=0; i<size; i++){
785 askSimBit(BitStream[i]^invert^1, &n, clk, encoding);
786 }
787 }
788 }
789 if (separator==1 && encoding == 1)
790 stAskSimBit(&n, clk);
791 else if (separator==1)
792 Dbprintf("sorry but separator option not yet available");
793
794 Dbprintf("Simulating with clk: %d, invert: %d, encoding: %d, separator: %d, n: %d",clk, invert, encoding, separator, n);
795 //DEBUG
796 //Dbprintf("First 32:");
797 //uint8_t *dest = BigBuf_get_addr();
798 //i=0;
799 //Dbprintf("%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d", dest[i],dest[i+1],dest[i+2],dest[i+3],dest[i+4],dest[i+5],dest[i+6],dest[i+7],dest[i+8],dest[i+9],dest[i+10],dest[i+11],dest[i+12],dest[i+13],dest[i+14],dest[i+15]);
800 //i+=16;
801 //Dbprintf("%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d", dest[i],dest[i+1],dest[i+2],dest[i+3],dest[i+4],dest[i+5],dest[i+6],dest[i+7],dest[i+8],dest[i+9],dest[i+10],dest[i+11],dest[i+12],dest[i+13],dest[i+14],dest[i+15]);
802
803 if (ledcontrol) LED_A_ON();
804 SimulateTagLowFrequency(n, 0, ledcontrol);
805 if (ledcontrol) LED_A_OFF();
806 }
807
808 //carrier can be 2,4 or 8
809 static void pskSimBit(uint8_t waveLen, int *n, uint8_t clk, uint8_t *curPhase, bool phaseChg)
810 {
811 uint8_t *dest = BigBuf_get_addr();
812 uint8_t halfWave = waveLen/2;
813 //uint8_t idx;
814 int i = 0;
815 if (phaseChg){
816 // write phase change
817 memset(dest+(*n), *curPhase^1, halfWave);
818 memset(dest+(*n) + halfWave, *curPhase, halfWave);
819 *n += waveLen;
820 *curPhase ^= 1;
821 i += waveLen;
822 }
823 //write each normal clock wave for the clock duration
824 for (; i < clk; i+=waveLen){
825 memset(dest+(*n), *curPhase, halfWave);
826 memset(dest+(*n) + halfWave, *curPhase^1, halfWave);
827 *n += waveLen;
828 }
829 }
830
831 // args clock, carrier, invert,
832 void CmdPSKsimTag(uint16_t arg1, uint16_t arg2, size_t size, uint8_t *BitStream)
833 {
834 int ledcontrol=1;
835 int n=0, i=0;
836 uint8_t clk = arg1 >> 8;
837 uint8_t carrier = arg1 & 0xFF;
838 uint8_t invert = arg2 & 0xFF;
839 uint8_t curPhase = 0;
840 // set LF so we don't kill the bigbuf we are setting with simulation data.
841 FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
842
843 for (i=0; i<size; i++){
844 if (BitStream[i] == curPhase){
845 pskSimBit(carrier, &n, clk, &curPhase, false);
846 } else {
847 pskSimBit(carrier, &n, clk, &curPhase, true);
848 }
849 }
850 Dbprintf("Simulating with Carrier: %d, clk: %d, invert: %d, n: %d",carrier, clk, invert, n);
851 //Dbprintf("DEBUG: First 32:");
852 //uint8_t *dest = BigBuf_get_addr();
853 //i=0;
854 //Dbprintf("%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d", dest[i],dest[i+1],dest[i+2],dest[i+3],dest[i+4],dest[i+5],dest[i+6],dest[i+7],dest[i+8],dest[i+9],dest[i+10],dest[i+11],dest[i+12],dest[i+13],dest[i+14],dest[i+15]);
855 //i+=16;
856 //Dbprintf("%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d%d", dest[i],dest[i+1],dest[i+2],dest[i+3],dest[i+4],dest[i+5],dest[i+6],dest[i+7],dest[i+8],dest[i+9],dest[i+10],dest[i+11],dest[i+12],dest[i+13],dest[i+14],dest[i+15]);
857
858 if (ledcontrol) LED_A_ON();
859 SimulateTagLowFrequency(n, 0, ledcontrol);
860 if (ledcontrol) LED_A_OFF();
861 }
862
863 // loop to get raw HID waveform then FSK demodulate the TAG ID from it
864 void CmdHIDdemodFSK(int findone, int *high2, int *high, int *low, int ledcontrol)
865 {
866 uint8_t *dest = BigBuf_get_addr();
867 //const size_t sizeOfBigBuff = BigBuf_max_traceLen();
868 size_t size;
869 uint32_t hi2=0, hi=0, lo=0;
870 int idx=0;
871 int dummyIdx = 0;
872 // Configure to go in 125Khz listen mode
873 LFSetupFPGAForADC(95, true);
874
875 //clear read buffer
876 BigBuf_Clear_keep_EM();
877
878 while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
879 WDT_HIT();
880 if (ledcontrol) LED_A_ON();
881
882 DoAcquisition_default(-1,true);
883 // FSK demodulator
884 //size = sizeOfBigBuff; //variable size will change after demod so re initialize it before use
885 size = 50*128*2; //big enough to catch 2 sequences of largest format
886 idx = HIDdemodFSK(dest, &size, &hi2, &hi, &lo, &dummyIdx);
887
888 if (idx>0 && lo>0 && (size==96 || size==192)){
889 uint8_t bitlen = 0;
890 uint32_t fc = 0;
891 uint32_t cardnum = 0;
892 bool decoded = false;
893
894 // go over previously decoded manchester data and decode into usable tag ID
895 if ((hi2 & 0x000FFFF) != 0){ //extra large HID tags 88/192 bits
896 uint32_t bp = hi2 & 0x000FFFFF;
897 bitlen = 63;
898 while (bp > 0) {
899 bp = bp >> 1;
900 bitlen++;
901 }
902 } else if ((hi >> 6) > 0) {
903 uint32_t bp = hi;
904 bitlen = 31;
905 while (bp > 0) {
906 bp = bp >> 1;
907 bitlen++;
908 }
909 } else if (((hi >> 5) & 1) == 0) {
910 bitlen = 37;
911 } else if ((hi & 0x0000001F) > 0 ) {
912 uint32_t bp = (hi & 0x0000001F);
913 bitlen = 31;
914 while (bp > 0) {
915 bp = bp >> 1;
916 bitlen++;
917 }
918 } else {
919 uint32_t bp = lo;
920 bitlen = 0;
921 while (bp > 0) {
922 bp = bp >> 1;
923 bitlen++;
924 }
925 }
926 switch (bitlen){
927 case 26:
928 cardnum = (lo>>1)&0xFFFF;
929 fc = (lo>>17)&0xFF;
930 decoded = true;
931 break;
932 case 35:
933 cardnum = (lo>>1)&0xFFFFF;
934 fc = ((hi&1)<<11)|(lo>>21);
935 decoded = true;
936 break;
937 }
938
939 if (hi2 != 0) //extra large HID tags 88/192 bits
940 Dbprintf("TAG ID: %x%08x%08x (%d)",
941 (unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
942 else
943 Dbprintf("TAG ID: %x%08x (%d)",
944 (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
945
946 if (decoded)
947 Dbprintf("Format Len: %dbits - FC: %d - Card: %d",
948 (unsigned int) bitlen, (unsigned int) fc, (unsigned int) cardnum);
949
950 if (findone){
951 if (ledcontrol) LED_A_OFF();
952 *high2 = hi2;
953 *high = hi;
954 *low = lo;
955 break;
956 }
957 // reset
958 }
959 hi2 = hi = lo = idx = 0;
960 WDT_HIT();
961 }
962
963 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
964 DbpString("Stopped");
965 if (ledcontrol) LED_A_OFF();
966 }
967
968 // loop to get raw HID waveform then FSK demodulate the TAG ID from it
969 void CmdAWIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
970 {
971 uint8_t *dest = BigBuf_get_addr();
972 size_t size;
973 int idx=0, dummyIdx=0;
974 //clear read buffer
975 BigBuf_Clear_keep_EM();
976 // Configure to go in 125Khz listen mode
977 LFSetupFPGAForADC(95, true);
978
979 while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
980
981 WDT_HIT();
982 if (ledcontrol) LED_A_ON();
983
984 DoAcquisition_default(-1,true);
985 // FSK demodulator
986 size = 50*128*2; //big enough to catch 2 sequences of largest format
987 idx = AWIDdemodFSK(dest, &size, &dummyIdx);
988
989 if (idx<=0 || size!=96) continue;
990 // Index map
991 // 0 10 20 30 40 50 60
992 // | | | | | | |
993 // 01234567 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 - to 96
994 // -----------------------------------------------------------------------------
995 // 00000001 000 1 110 1 101 1 011 1 101 1 010 0 000 1 000 1 010 0 001 0 110 1 100 0 000 1 000 1
996 // premable bbb o bbb o bbw o fff o fff o ffc o ccc o ccc o ccc o ccc o ccc o wxx o xxx o xxx o - to 96
997 // |---26 bit---| |-----117----||-------------142-------------|
998 // b = format bit len, o = odd parity of last 3 bits
999 // f = facility code, c = card number
1000 // w = wiegand parity
1001 // (26 bit format shown)
1002
1003 //get raw ID before removing parities
1004 uint32_t rawLo = bytebits_to_byte(dest+idx+64,32);
1005 uint32_t rawHi = bytebits_to_byte(dest+idx+32,32);
1006 uint32_t rawHi2 = bytebits_to_byte(dest+idx,32);
1007
1008 size = removeParity(dest, idx+8, 4, 1, 88);
1009 if (size != 66) continue;
1010 // ok valid card found!
1011
1012 // Index map
1013 // 0 10 20 30 40 50 60
1014 // | | | | | | |
1015 // 01234567 8 90123456 7890123456789012 3 456789012345678901234567890123456
1016 // -----------------------------------------------------------------------------
1017 // 00011010 1 01110101 0000000010001110 1 000000000000000000000000000000000
1018 // bbbbbbbb w ffffffff cccccccccccccccc w xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
1019 // |26 bit| |-117--| |-----142------|
1020 // b = format bit len, o = odd parity of last 3 bits
1021 // f = facility code, c = card number
1022 // w = wiegand parity
1023 // (26 bit format shown)
1024
1025 uint32_t fc = 0;
1026 uint32_t cardnum = 0;
1027 uint32_t code1 = 0;
1028 uint32_t code2 = 0;
1029 uint8_t fmtLen = bytebits_to_byte(dest,8);
1030 if (fmtLen==26){
1031 fc = bytebits_to_byte(dest+9, 8);
1032 cardnum = bytebits_to_byte(dest+17, 16);
1033 code1 = bytebits_to_byte(dest+8,fmtLen);
1034 Dbprintf("AWID Found - BitLength: %d, FC: %d, Card: %d - Wiegand: %x, Raw: %08x%08x%08x", fmtLen, fc, cardnum, code1, rawHi2, rawHi, rawLo);
1035 } else {
1036 cardnum = bytebits_to_byte(dest+8+(fmtLen-17), 16);
1037 if (fmtLen>32){
1038 code1 = bytebits_to_byte(dest+8,fmtLen-32);
1039 code2 = bytebits_to_byte(dest+8+(fmtLen-32),32);
1040 Dbprintf("AWID Found - BitLength: %d -unknown BitLength- (%d) - Wiegand: %x%08x, Raw: %08x%08x%08x", fmtLen, cardnum, code1, code2, rawHi2, rawHi, rawLo);
1041 } else{
1042 code1 = bytebits_to_byte(dest+8,fmtLen);
1043 Dbprintf("AWID Found - BitLength: %d -unknown BitLength- (%d) - Wiegand: %x, Raw: %08x%08x%08x", fmtLen, cardnum, code1, rawHi2, rawHi, rawLo);
1044 }
1045 }
1046 if (findone){
1047 if (ledcontrol) LED_A_OFF();
1048 break;
1049 }
1050 // reset
1051 idx = 0;
1052 WDT_HIT();
1053 }
1054 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1055 DbpString("Stopped");
1056 if (ledcontrol) LED_A_OFF();
1057 }
1058
1059 void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol)
1060 {
1061 uint8_t *dest = BigBuf_get_addr();
1062
1063 size_t size=0, idx=0;
1064 int clk=0, invert=0, errCnt=0, maxErr=20;
1065 uint32_t hi=0;
1066 uint64_t lo=0;
1067 //clear read buffer
1068 BigBuf_Clear_keep_EM();
1069 // Configure to go in 125Khz listen mode
1070 LFSetupFPGAForADC(95, true);
1071
1072 while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
1073
1074 WDT_HIT();
1075 if (ledcontrol) LED_A_ON();
1076
1077 DoAcquisition_default(-1,true);
1078 size = BigBuf_max_traceLen();
1079 //askdemod and manchester decode
1080 if (size > 16385) size = 16385; //big enough to catch 2 sequences of largest format
1081 errCnt = askdemod(dest, &size, &clk, &invert, maxErr, 0, 1);
1082 WDT_HIT();
1083
1084 if (errCnt<0) continue;
1085
1086 errCnt = Em410xDecode(dest, &size, &idx, &hi, &lo);
1087 if (errCnt){
1088 if (size>64){
1089 Dbprintf("EM XL TAG ID: %06x%08x%08x - (%05d_%03d_%08d)",
1090 hi,
1091 (uint32_t)(lo>>32),
1092 (uint32_t)lo,
1093 (uint32_t)(lo&0xFFFF),
1094 (uint32_t)((lo>>16LL) & 0xFF),
1095 (uint32_t)(lo & 0xFFFFFF));
1096 } else {
1097 Dbprintf("EM TAG ID: %02x%08x - (%05d_%03d_%08d)",
1098 (uint32_t)(lo>>32),
1099 (uint32_t)lo,
1100 (uint32_t)(lo&0xFFFF),
1101 (uint32_t)((lo>>16LL) & 0xFF),
1102 (uint32_t)(lo & 0xFFFFFF));
1103 }
1104
1105 if (findone){
1106 if (ledcontrol) LED_A_OFF();
1107 *high=lo>>32;
1108 *low=lo & 0xFFFFFFFF;
1109 break;
1110 }
1111 }
1112 WDT_HIT();
1113 hi = lo = size = idx = 0;
1114 clk = invert = errCnt = 0;
1115 }
1116 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1117 DbpString("Stopped");
1118 if (ledcontrol) LED_A_OFF();
1119 }
1120
1121 void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
1122 {
1123 uint8_t *dest = BigBuf_get_addr();
1124 int idx=0;
1125 uint32_t code=0, code2=0;
1126 uint8_t version=0;
1127 uint8_t facilitycode=0;
1128 uint16_t number=0;
1129 int dummyIdx=0;
1130 //clear read buffer
1131 BigBuf_Clear_keep_EM();
1132 // Configure to go in 125Khz listen mode
1133 LFSetupFPGAForADC(95, true);
1134
1135 while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
1136 WDT_HIT();
1137 if (ledcontrol) LED_A_ON();
1138 DoAcquisition_default(-1,true);
1139 //fskdemod and get start index
1140 WDT_HIT();
1141 idx = IOdemodFSK(dest, BigBuf_max_traceLen(), &dummyIdx);
1142 if (idx<0) continue;
1143 //valid tag found
1144
1145 //Index map
1146 //0 10 20 30 40 50 60
1147 //| | | | | | |
1148 //01234567 8 90123456 7 89012345 6 78901234 5 67890123 4 56789012 3 45678901 23
1149 //-----------------------------------------------------------------------------
1150 //00000000 0 11110000 1 facility 1 version* 1 code*one 1 code*two 1 ???????? 11
1151 //
1152 //XSF(version)facility:codeone+codetwo
1153 //Handle the data
1154 if(findone){ //only print binary if we are doing one
1155 Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx], dest[idx+1], dest[idx+2],dest[idx+3],dest[idx+4],dest[idx+5],dest[idx+6],dest[idx+7],dest[idx+8]);
1156 Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+9], dest[idx+10],dest[idx+11],dest[idx+12],dest[idx+13],dest[idx+14],dest[idx+15],dest[idx+16],dest[idx+17]);
1157 Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+18],dest[idx+19],dest[idx+20],dest[idx+21],dest[idx+22],dest[idx+23],dest[idx+24],dest[idx+25],dest[idx+26]);
1158 Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+27],dest[idx+28],dest[idx+29],dest[idx+30],dest[idx+31],dest[idx+32],dest[idx+33],dest[idx+34],dest[idx+35]);
1159 Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+36],dest[idx+37],dest[idx+38],dest[idx+39],dest[idx+40],dest[idx+41],dest[idx+42],dest[idx+43],dest[idx+44]);
1160 Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+45],dest[idx+46],dest[idx+47],dest[idx+48],dest[idx+49],dest[idx+50],dest[idx+51],dest[idx+52],dest[idx+53]);
1161 Dbprintf("%d%d%d%d%d%d%d%d %d%d",dest[idx+54],dest[idx+55],dest[idx+56],dest[idx+57],dest[idx+58],dest[idx+59],dest[idx+60],dest[idx+61],dest[idx+62],dest[idx+63]);
1162 }
1163 code = bytebits_to_byte(dest+idx,32);
1164 code2 = bytebits_to_byte(dest+idx+32,32);
1165 version = bytebits_to_byte(dest+idx+27,8); //14,4
1166 facilitycode = bytebits_to_byte(dest+idx+18,8);
1167 number = (bytebits_to_byte(dest+idx+36,8)<<8)|(bytebits_to_byte(dest+idx+45,8)); //36,9
1168
1169 Dbprintf("XSF(%02d)%02x:%05d (%08x%08x)",version,facilitycode,number,code,code2);
1170 // if we're only looking for one tag
1171 if (findone){
1172 if (ledcontrol) LED_A_OFF();
1173 //LED_A_OFF();
1174 *high=code;
1175 *low=code2;
1176 break;
1177 }
1178 code=code2=0;
1179 version=facilitycode=0;
1180 number=0;
1181 idx=0;
1182
1183 WDT_HIT();
1184 }
1185 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1186 DbpString("Stopped");
1187 if (ledcontrol) LED_A_OFF();
1188 }
1189
1190 /*------------------------------
1191 * T5555/T5557/T5567/T5577 routines
1192 *------------------------------
1193 * NOTE: T55x7/T5555 configuration register definitions moved to protocols.h
1194 *
1195 * Relevant communication times in microsecond
1196 * To compensate antenna falling times shorten the write times
1197 * and enlarge the gap ones.
1198 * Q5 tags seems to have issues when these values changes.
1199 */
1200 #define START_GAP 31*8 // was 250 // SPEC: 1*8 to 50*8 - typ 15*8 (or 15fc)
1201 #define WRITE_GAP 20*8 // was 160 // SPEC: 1*8 to 20*8 - typ 10*8 (or 10fc)
1202 #define WRITE_0 18*8 // was 144 // SPEC: 16*8 to 32*8 - typ 24*8 (or 24fc)
1203 #define WRITE_1 50*8 // was 400 // SPEC: 48*8 to 64*8 - typ 56*8 (or 56fc) 432 for T55x7; 448 for E5550
1204 #define READ_GAP 15*8
1205
1206 void TurnReadLFOn(int delay) {
1207 FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
1208 // Give it a bit of time for the resonant antenna to settle.
1209 WaitUS(delay); //155*8 //50*8
1210 }
1211
1212 // Write one bit to card
1213 void T55xxWriteBit(int bit) {
1214 if (!bit)
1215 TurnReadLFOn(WRITE_0);
1216 else
1217 TurnReadLFOn(WRITE_1);
1218 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1219 WaitUS(WRITE_GAP);
1220 }
1221
1222 // Send T5577 reset command then read stream (see if we can identify the start of the stream)
1223 void T55xxResetRead(void) {
1224 LED_A_ON();
1225 //clear buffer now so it does not interfere with timing later
1226 BigBuf_Clear_keep_EM();
1227
1228 // Set up FPGA, 125kHz
1229 LFSetupFPGAForADC(95, true);
1230 StartTicks();
1231 // make sure tag is fully powered up...
1232 WaitMS(5);
1233
1234 // Trigger T55x7 in mode.
1235 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1236 WaitUS(START_GAP);
1237
1238 // reset tag - op code 00
1239 T55xxWriteBit(0);
1240 T55xxWriteBit(0);
1241
1242 TurnReadLFOn(READ_GAP);
1243
1244 // Acquisition
1245 DoPartialAcquisition(0, true, BigBuf_max_traceLen(), 0);
1246
1247 // Turn the field off
1248 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
1249 cmd_send(CMD_ACK,0,0,0,0,0);
1250 LED_A_OFF();
1251 }
1252
1253 // Write one card block in page 0, no lock
1254 void T55xxWriteBlockExt(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t arg) {
1255 LED_A_ON();
1256 bool PwdMode = arg & 0x1;
1257 uint8_t Page = (arg & 0x2)>>1;
1258 bool testMode = arg & 0x4;
1259 uint32_t i = 0;
1260
1261 // Set up FPGA, 125kHz
1262 LFSetupFPGAForADC(95, true);
1263 StartTicks();
1264 // make sure tag is fully powered up...
1265 WaitMS(5);
1266 // Trigger T55x7 in mode.
1267 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1268 WaitUS(START_GAP);
1269
1270 if (testMode) Dbprintf("TestMODE");
1271 // Std Opcode 10
1272 T55xxWriteBit(testMode ? 0 : 1);
1273 T55xxWriteBit(testMode ? 1 : Page); //Page 0
1274
1275 if (PwdMode) {
1276 // Send Pwd
1277 for (i = 0x80000000; i != 0; i >>= 1)
1278 T55xxWriteBit(Pwd & i);
1279 }
1280 // Send Lock bit
1281 T55xxWriteBit(0);
1282
1283 // Send Data
1284 for (i = 0x80000000; i != 0; i >>= 1)
1285 T55xxWriteBit(Data & i);
1286
1287 // Send Block number
1288 for (i = 0x04; i != 0; i >>= 1)
1289 T55xxWriteBit(Block & i);
1290
1291 // Perform write (nominal is 5.6 ms for T55x7 and 18ms for E5550,
1292 // so wait a little more)
1293
1294 // "there is a clock delay before programming"
1295 // - programming takes ~5.6ms for t5577 ~18ms for E5550 or t5567
1296 // so we should wait 1 clock + 5.6ms then read response?
1297 // but we need to know we are dealing with t5577 vs t5567 vs e5550 (or q5) marshmellow...
1298 if (testMode) {
1299 //TESTMODE TIMING TESTS:
1300 // <566us does nothing
1301 // 566-568 switches between wiping to 0s and doing nothing
1302 // 5184 wipes and allows 1 block to be programmed.
1303 // indefinite power on wipes and then programs all blocks with bitshifted data sent.
1304 TurnReadLFOn(5184);
1305
1306 } else {
1307 TurnReadLFOn(20 * 1000);
1308 //could attempt to do a read to confirm write took
1309 // as the tag should repeat back the new block
1310 // until it is reset, but to confirm it we would
1311 // need to know the current block 0 config mode for
1312 // modulation clock an other details to demod the response...
1313 // response should be (for t55x7) a 0 bit then (ST if on)
1314 // block data written in on repeat until reset.
1315
1316 //DoPartialAcquisition(20, true, 12000);
1317 }
1318
1319 // turn field off
1320 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1321 LED_A_OFF();
1322 }
1323
1324 // Write one card block in page 0, no lock
1325 void T55xxWriteBlock(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t arg) {
1326 T55xxWriteBlockExt(Data, Block, Pwd, arg);
1327 cmd_send(CMD_ACK,0,0,0,0,0);
1328 }
1329
1330 // Read one card block in page [page]
1331 void T55xxReadBlock(uint16_t arg0, uint8_t Block, uint32_t Pwd) {
1332 LED_A_ON();
1333 bool PwdMode = arg0 & 0x1;
1334 uint8_t Page = (arg0 & 0x2) >> 1;
1335 uint32_t i = 0;
1336 bool RegReadMode = (Block == 0xFF);//regular read mode
1337
1338 //clear buffer now so it does not interfere with timing later
1339 BigBuf_Clear_ext(false);
1340
1341 //make sure block is at max 7
1342 Block &= 0x7;
1343
1344 // Set up FPGA, 125kHz to power up the tag
1345 LFSetupFPGAForADC(95, true);
1346 StartTicks();
1347 // make sure tag is fully powered up...
1348 WaitMS(5);
1349 // Trigger T55x7 Direct Access Mode with start gap
1350 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1351 WaitUS(START_GAP);
1352
1353 // Opcode 1[page]
1354 T55xxWriteBit(1);
1355 T55xxWriteBit(Page); //Page 0
1356
1357 if (PwdMode){
1358 // Send Pwd
1359 for (i = 0x80000000; i != 0; i >>= 1)
1360 T55xxWriteBit(Pwd & i);
1361 }
1362 // Send a zero bit separation
1363 T55xxWriteBit(0);
1364
1365 // Send Block number (if direct access mode)
1366 if (!RegReadMode)
1367 for (i = 0x04; i != 0; i >>= 1)
1368 T55xxWriteBit(Block & i);
1369
1370 // Turn field on to read the response
1371 // 137*8 seems to get to the start of data pretty well...
1372 // but we want to go past the start and let the repeating data settle in...
1373 TurnReadLFOn(210*8);
1374
1375 // Acquisition
1376 // Now do the acquisition
1377 DoPartialAcquisition(0, true, 12000, 0);
1378
1379 // Turn the field off
1380 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
1381 cmd_send(CMD_ACK,0,0,0,0,0);
1382 LED_A_OFF();
1383 }
1384
1385 void T55xxWakeUp(uint32_t Pwd){
1386 LED_B_ON();
1387 uint32_t i = 0;
1388
1389 // Set up FPGA, 125kHz
1390 LFSetupFPGAForADC(95, true);
1391 StartTicks();
1392 // make sure tag is fully powered up...
1393 WaitMS(5);
1394
1395 // Trigger T55x7 Direct Access Mode
1396 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
1397 WaitUS(START_GAP);
1398
1399 // Opcode 10
1400 T55xxWriteBit(1);
1401 T55xxWriteBit(0); //Page 0
1402
1403 // Send Pwd
1404 for (i = 0x80000000; i != 0; i >>= 1)
1405 T55xxWriteBit(Pwd & i);
1406
1407 // Turn and leave field on to let the begin repeating transmission
1408 TurnReadLFOn(20*1000);
1409 }
1410
1411 /*-------------- Cloning routines -----------*/
1412
1413 void WriteT55xx(uint32_t *blockdata, uint8_t startblock, uint8_t numblocks) {
1414 // write last block first and config block last (if included)
1415 for (uint8_t i = numblocks+startblock; i > startblock; i--) {
1416 T55xxWriteBlockExt(blockdata[i-1],i-1,0,0);
1417 }
1418 }
1419
1420 // Copy a HID-like card (e.g. HID Proximity, Paradox) to a T55x7 compatible card
1421 void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT, uint8_t preamble) {
1422 uint32_t data[] = {0,0,0,0,0,0,0};
1423 uint8_t last_block = 0;
1424
1425 if (longFMT) {
1426 // Ensure no more than 84 bits supplied
1427 if (hi2>0xFFFFF) {
1428 DbpString("Tags can only have 84 bits.");
1429 return;
1430 }
1431 // Build the 6 data blocks for supplied 84bit ID
1432 last_block = 6;
1433 // load preamble & long format identifier (9E manchester encoded)
1434 data[1] = (preamble << 24) | 0x96A900 | (manchesterEncode2Bytes((hi2 >> 16) & 0xF) & 0xFF);
1435 // load raw id from hi2, hi, lo to data blocks (manchester encoded)
1436 data[2] = manchesterEncode2Bytes(hi2 & 0xFFFF);
1437 data[3] = manchesterEncode2Bytes(hi >> 16);
1438 data[4] = manchesterEncode2Bytes(hi & 0xFFFF);
1439 data[5] = manchesterEncode2Bytes(lo >> 16);
1440 data[6] = manchesterEncode2Bytes(lo & 0xFFFF);
1441 } else {
1442 // Ensure no more than 44 bits supplied
1443 if (hi>0xFFF) {
1444 DbpString("Tags can only have 44 bits.");
1445 return;
1446 }
1447 // Build the 3 data blocks for supplied 44bit ID
1448 last_block = 3;
1449 // load preamble
1450 data[1] = (preamble << 24) | (manchesterEncode2Bytes(hi) & 0xFFFFFF);
1451 data[2] = manchesterEncode2Bytes(lo >> 16);
1452 data[3] = manchesterEncode2Bytes(lo & 0xFFFF);
1453 }
1454 // load chip config block
1455 data[0] = T55x7_BITRATE_RF_50 | T55x7_MODULATION_FSK2a | last_block << T55x7_MAXBLOCK_SHIFT;
1456
1457 //TODO add selection of chip for Q5 or T55x7
1458 // data[0] = (((50-2)/2)<<T5555_BITRATE_SHIFT) | T5555_MODULATION_FSK2 | T5555_INVERT_OUTPUT | last_block << T5555_MAXBLOCK_SHIFT;
1459
1460 LED_D_ON();
1461 // Program the data blocks for supplied ID
1462 // and the block 0 for HID format
1463 WriteT55xx(data, 0, last_block+1);
1464
1465 LED_D_OFF();
1466
1467 DbpString("DONE!");
1468 }
1469
1470 void CopyIOtoT55x7(uint32_t hi, uint32_t lo) {
1471 uint32_t data[] = {T55x7_BITRATE_RF_64 | T55x7_MODULATION_FSK2a | (2 << T55x7_MAXBLOCK_SHIFT), hi, lo};
1472 //TODO add selection of chip for Q5 or T55x7
1473 // data[0] = (((64-2)/2)<<T5555_BITRATE_SHIFT) | T5555_MODULATION_FSK2 | T5555_INVERT_OUTPUT | 2 << T5555_MAXBLOCK_SHIFT;
1474
1475 LED_D_ON();
1476 // Program the data blocks for supplied ID
1477 // and the block 0 config
1478 WriteT55xx(data, 0, 3);
1479
1480 LED_D_OFF();
1481
1482 DbpString("DONE!");
1483 }
1484
1485 // Clone Indala 64-bit tag by UID to T55x7
1486 void CopyIndala64toT55x7(uint32_t hi, uint32_t lo) {
1487 //Program the 2 data blocks for supplied 64bit UID
1488 // and the Config for Indala 64 format (RF/32;PSK1 with RF/2;Maxblock=2)
1489 uint32_t data[] = { T55x7_BITRATE_RF_32 | T55x7_MODULATION_PSK1 | (2 << T55x7_MAXBLOCK_SHIFT), hi, lo};
1490 //TODO add selection of chip for Q5 or T55x7
1491 // data[0] = (((32-2)/2)<<T5555_BITRATE_SHIFT) | T5555_MODULATION_PSK1 | 2 << T5555_MAXBLOCK_SHIFT;
1492
1493 WriteT55xx(data, 0, 3);
1494 //Alternative config for Indala (Extended mode;RF/32;PSK1 with RF/2;Maxblock=2;Inverse data)
1495 // T5567WriteBlock(0x603E1042,0);
1496 DbpString("DONE!");
1497 }
1498 // Clone Indala 224-bit tag by UID to T55x7
1499 void CopyIndala224toT55x7(uint32_t uid1, uint32_t uid2, uint32_t uid3, uint32_t uid4, uint32_t uid5, uint32_t uid6, uint32_t uid7) {
1500 //Program the 7 data blocks for supplied 224bit UID
1501 uint32_t data[] = {0, uid1, uid2, uid3, uid4, uid5, uid6, uid7};
1502 // and the block 0 for Indala224 format
1503 //Config for Indala (RF/32;PSK2 with RF/2;Maxblock=7)
1504 data[0] = T55x7_BITRATE_RF_32 | T55x7_MODULATION_PSK2 | (7 << T55x7_MAXBLOCK_SHIFT);
1505 //TODO add selection of chip for Q5 or T55x7
1506 // data[0] = (((32-2)>>1)<<T5555_BITRATE_SHIFT) | T5555_MODULATION_PSK2 | 7 << T5555_MAXBLOCK_SHIFT;
1507 WriteT55xx(data, 0, 8);
1508 //Alternative config for Indala (Extended mode;RF/32;PSK1 with RF/2;Maxblock=7;Inverse data)
1509 // T5567WriteBlock(0x603E10E2,0);
1510 DbpString("DONE!");
1511 }
1512 // clone viking tag to T55xx
1513 void CopyVikingtoT55xx(uint32_t block1, uint32_t block2, uint8_t Q5) {
1514 uint32_t data[] = {T55x7_BITRATE_RF_32 | T55x7_MODULATION_MANCHESTER | (2 << T55x7_MAXBLOCK_SHIFT), block1, block2};
1515 if (Q5) data[0] = T5555_SET_BITRATE(32) | T5555_MODULATION_MANCHESTER | 2 << T5555_MAXBLOCK_SHIFT;
1516 // Program the data blocks for supplied ID and the block 0 config
1517 WriteT55xx(data, 0, 3);
1518 LED_D_OFF();
1519 cmd_send(CMD_ACK,0,0,0,0,0);
1520 }
1521
1522 // Define 9bit header for EM410x tags
1523 #define EM410X_HEADER 0x1FF
1524 #define EM410X_ID_LENGTH 40
1525
1526 void WriteEM410x(uint32_t card, uint32_t id_hi, uint32_t id_lo) {
1527 int i, id_bit;
1528 uint64_t id = EM410X_HEADER;
1529 uint64_t rev_id = 0; // reversed ID
1530 int c_parity[4]; // column parity
1531 int r_parity = 0; // row parity
1532 uint32_t clock = 0;
1533
1534 // Reverse ID bits given as parameter (for simpler operations)
1535 for (i = 0; i < EM410X_ID_LENGTH; ++i) {
1536 if (i < 32) {
1537 rev_id = (rev_id << 1) | (id_lo & 1);
1538 id_lo >>= 1;
1539 } else {
1540 rev_id = (rev_id << 1) | (id_hi & 1);
1541 id_hi >>= 1;
1542 }
1543 }
1544
1545 for (i = 0; i < EM410X_ID_LENGTH; ++i) {
1546 id_bit = rev_id & 1;
1547
1548 if (i % 4 == 0) {
1549 // Don't write row parity bit at start of parsing
1550 if (i)
1551 id = (id << 1) | r_parity;
1552 // Start counting parity for new row
1553 r_parity = id_bit;
1554 } else {
1555 // Count row parity
1556 r_parity ^= id_bit;
1557 }
1558
1559 // First elements in column?
1560 if (i < 4)
1561 // Fill out first elements
1562 c_parity[i] = id_bit;
1563 else
1564 // Count column parity
1565 c_parity[i % 4] ^= id_bit;
1566
1567 // Insert ID bit
1568 id = (id << 1) | id_bit;
1569 rev_id >>= 1;
1570 }
1571
1572 // Insert parity bit of last row
1573 id = (id << 1) | r_parity;
1574
1575 // Fill out column parity at the end of tag
1576 for (i = 0; i < 4; ++i)
1577 id = (id << 1) | c_parity[i];
1578
1579 // Add stop bit
1580 id <<= 1;
1581
1582 Dbprintf("Started writing %s tag ...", card ? "T55x7":"T5555");
1583 LED_D_ON();
1584
1585 // Write EM410x ID
1586 uint32_t data[] = {0, (uint32_t)(id>>32), (uint32_t)(id & 0xFFFFFFFF)};
1587
1588 clock = (card & 0xFF00) >> 8;
1589 clock = (clock == 0) ? 64 : clock;
1590 Dbprintf("Clock rate: %d", clock);
1591 if (card & 0xFF) { //t55x7
1592 clock = GetT55xxClockBit(clock);
1593 if (clock == 0) {
1594 Dbprintf("Invalid clock rate: %d", clock);
1595 return;
1596 }
1597 data[0] = clock | T55x7_MODULATION_MANCHESTER | (2 << T55x7_MAXBLOCK_SHIFT);
1598 } else { //t5555 (Q5)
1599 data[0] = T5555_SET_BITRATE(clock) | T5555_MODULATION_MANCHESTER | (2 << T5555_MAXBLOCK_SHIFT);
1600 }
1601
1602 WriteT55xx(data, 0, 3);
1603
1604 LED_D_OFF();
1605 Dbprintf("Tag %s written with 0x%08x%08x\n", card ? "T55x7":"T5555",
1606 (uint32_t)(id >> 32), (uint32_t)id);
1607 }
1608
1609 //-----------------------------------
1610 // EM4469 / EM4305 routines
1611 //-----------------------------------
1612 #define FWD_CMD_LOGIN 0xC //including the even parity, binary mirrored
1613 #define FWD_CMD_WRITE 0xA
1614 #define FWD_CMD_READ 0x9
1615 #define FWD_CMD_DISABLE 0x5
1616
1617 uint8_t forwardLink_data[64]; //array of forwarded bits
1618 uint8_t * forward_ptr; //ptr for forward message preparation
1619 uint8_t fwd_bit_sz; //forwardlink bit counter
1620 uint8_t * fwd_write_ptr; //forwardlink bit pointer
1621
1622 //====================================================================
1623 // prepares command bits
1624 // see EM4469 spec
1625 //====================================================================
1626 //--------------------------------------------------------------------
1627 // VALUES TAKEN FROM EM4x function: SendForward
1628 // START_GAP = 440; (55*8) cycles at 125Khz (8us = 1cycle)
1629 // WRITE_GAP = 128; (16*8)
1630 // WRITE_1 = 256 32*8; (32*8)
1631
1632 // These timings work for 4469/4269/4305 (with the 55*8 above)
1633 // WRITE_0 = 23*8 , 9*8 SpinDelayUs(23*8);
1634
1635 uint8_t Prepare_Cmd( uint8_t cmd ) {
1636
1637 *forward_ptr++ = 0; //start bit
1638 *forward_ptr++ = 0; //second pause for 4050 code
1639
1640 *forward_ptr++ = cmd;
1641 cmd >>= 1;
1642 *forward_ptr++ = cmd;
1643 cmd >>= 1;
1644 *forward_ptr++ = cmd;
1645 cmd >>= 1;
1646 *forward_ptr++ = cmd;
1647
1648 return 6; //return number of emited bits
1649 }
1650
1651 //====================================================================
1652 // prepares address bits
1653 // see EM4469 spec
1654 //====================================================================
1655 uint8_t Prepare_Addr( uint8_t addr ) {
1656
1657 register uint8_t line_parity;
1658
1659 uint8_t i;
1660 line_parity = 0;
1661 for(i=0;i<6;i++) {
1662 *forward_ptr++ = addr;
1663 line_parity ^= addr;
1664 addr >>= 1;
1665 }
1666
1667 *forward_ptr++ = (line_parity & 1);
1668
1669 return 7; //return number of emited bits
1670 }
1671
1672 //====================================================================
1673 // prepares data bits intreleaved with parity bits
1674 // see EM4469 spec
1675 //====================================================================
1676 uint8_t Prepare_Data( uint16_t data_low, uint16_t data_hi) {
1677
1678 register uint8_t line_parity;
1679 register uint8_t column_parity;
1680 register uint8_t i, j;
1681 register uint16_t data;
1682
1683 data = data_low;
1684 column_parity = 0;
1685
1686 for(i=0; i<4; i++) {
1687 line_parity = 0;
1688 for(j=0; j<8; j++) {
1689 line_parity ^= data;
1690 column_parity ^= (data & 1) << j;
1691 *forward_ptr++ = data;
1692 data >>= 1;
1693 }
1694 *forward_ptr++ = line_parity;
1695 if(i == 1)
1696 data = data_hi;
1697 }
1698
1699 for(j=0; j<8; j++) {
1700 *forward_ptr++ = column_parity;
1701 column_parity >>= 1;
1702 }
1703 *forward_ptr = 0;
1704
1705 return 45; //return number of emited bits
1706 }
1707
1708 //====================================================================
1709 // Forward Link send function
1710 // Requires: forwarLink_data filled with valid bits (1 bit per byte)
1711 // fwd_bit_count set with number of bits to be sent
1712 //====================================================================
1713 void SendForward(uint8_t fwd_bit_count) {
1714
1715 fwd_write_ptr = forwardLink_data;
1716 fwd_bit_sz = fwd_bit_count;
1717
1718 // Set up FPGA, 125kHz or 95 divisor
1719 LFSetupFPGAForADC(95, true);
1720
1721 // force 1st mod pulse (start gap must be longer for 4305)
1722 fwd_bit_sz--; //prepare next bit modulation
1723 fwd_write_ptr++;
1724 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
1725 WaitUS(55*8); //55 cycles off (8us each)for 4305 //another reader has 37 here...
1726 FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);//field on
1727 WaitUS(18*8); //18 cycles on (8us each)
1728
1729 // now start writting
1730 while(fwd_bit_sz-- > 0) { //prepare next bit modulation
1731 if(((*fwd_write_ptr++) & 1) == 1)
1732 WaitUS(32*8); //32 cycles at 125Khz (8us each)
1733 else {
1734 //These timings work for 4469/4269/4305 (with the 55*8 above)
1735 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
1736 WaitUS(23*8); //23 cycles off (8us each)
1737 FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);//field on
1738 WaitUS(18*8); //18 cycles on (8us each)
1739 }
1740 }
1741 }
1742
1743 void EM4xLogin(uint32_t Password) {
1744
1745 uint8_t fwd_bit_count;
1746
1747 forward_ptr = forwardLink_data;
1748 fwd_bit_count = Prepare_Cmd( FWD_CMD_LOGIN );
1749 fwd_bit_count += Prepare_Data( Password&0xFFFF, Password>>16 );
1750
1751 SendForward(fwd_bit_count);
1752
1753 //Wait for command to complete
1754 SpinDelay(20);
1755 }
1756
1757 void EM4xReadWord(uint8_t Address, uint32_t Pwd, uint8_t PwdMode) {
1758
1759 uint8_t fwd_bit_count;
1760
1761 // Clear destination buffer before sending the command
1762 BigBuf_Clear_ext(false);
1763
1764 LED_A_ON();
1765 StartTicks();
1766 //If password mode do login
1767 if (PwdMode == 1) EM4xLogin(Pwd);
1768
1769 forward_ptr = forwardLink_data;
1770 fwd_bit_count = Prepare_Cmd( FWD_CMD_READ );
1771 fwd_bit_count += Prepare_Addr( Address );
1772
1773 SendForward(fwd_bit_count);
1774 WaitUS(400);
1775 // Now do the acquisition
1776 DoPartialAcquisition(20, true, 6000, 1000);
1777
1778 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
1779 LED_A_OFF();
1780 cmd_send(CMD_ACK,0,0,0,0,0);
1781 }
1782
1783 void EM4xWriteWord(uint32_t flag, uint32_t Data, uint32_t Pwd) {
1784
1785 bool PwdMode = (flag & 0xF);
1786 uint8_t Address = (flag >> 8) & 0xFF;
1787 uint8_t fwd_bit_count;
1788
1789 //clear buffer now so it does not interfere with timing later
1790 BigBuf_Clear_ext(false);
1791
1792 LED_A_ON();
1793 StartTicks();
1794 //If password mode do login
1795 if (PwdMode) EM4xLogin(Pwd);
1796
1797 forward_ptr = forwardLink_data;
1798 fwd_bit_count = Prepare_Cmd( FWD_CMD_WRITE );
1799 fwd_bit_count += Prepare_Addr( Address );
1800 fwd_bit_count += Prepare_Data( Data&0xFFFF, Data>>16 );
1801
1802 SendForward(fwd_bit_count);
1803
1804 //Wait for write to complete
1805 //SpinDelay(10);
1806
1807 WaitUS(6500);
1808 //Capture response if one exists
1809 DoPartialAcquisition(20, true, 6000, 1000);
1810
1811 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
1812 LED_A_OFF();
1813 cmd_send(CMD_ACK,0,0,0,0,0);
1814 }
1815 /*
1816 Reading a COTAG.
1817
1818 COTAG needs the reader to send a startsequence and the card has an extreme slow datarate.
1819 because of this, we can "sample" the data signal but we interpreate it to Manchester direct.
1820
1821 READER START SEQUENCE:
1822 burst 800 us, gap 2.2 msecs
1823 burst 3.6 msecs gap 2.2 msecs
1824 burst 800 us gap 2.2 msecs
1825 pulse 3.6 msecs
1826
1827 This triggers a COTAG tag to response
1828 */
1829 void Cotag(uint32_t arg0) {
1830
1831 #define OFF { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); WaitUS(2035); }
1832 #define ON(x) { FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); WaitUS((x)); }
1833
1834 uint8_t rawsignal = arg0 & 0xF;
1835
1836 LED_A_ON();
1837
1838 // Switching to LF image on FPGA. This might empty BigBuff
1839 FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
1840
1841 //clear buffer now so it does not interfere with timing later
1842 BigBuf_Clear_ext(false);
1843
1844 // Set up FPGA, 132kHz to power up the tag
1845 FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 89);
1846 FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
1847
1848 // Connect the A/D to the peak-detected low-frequency path.
1849 SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
1850
1851 // Now set up the SSC to get the ADC samples that are now streaming at us.
1852 FpgaSetupSsc(FPGA_MAJOR_MODE_LF_ADC);
1853
1854 // start clock - 1.5ticks is 1us
1855 StartTicks();
1856
1857 //send COTAG start pulse
1858 ON(740) OFF
1859 ON(3330) OFF
1860 ON(740) OFF
1861 ON(1000)
1862
1863 switch(rawsignal) {
1864 case 0: doCotagAcquisition(50000); break;
1865 case 1: doCotagAcquisitionManchester(); break;
1866 case 2: DoAcquisition_config(true, 0); break;
1867 }
1868
1869 // Turn the field off
1870 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
1871 cmd_send(CMD_ACK,0,0,0,0,0);
1872 LED_A_OFF();
1873 }
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