X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/70b2fc0abdb9efe03c3eb29c8b9d661ba4c3c90e..c0e7527dddf79e1d2758eb4dd55a6b0574fe0a9a:/armsrc/iso15693.c diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c index 9b0ab29e..9dc4bf18 100644 --- a/armsrc/iso15693.c +++ b/armsrc/iso15693.c @@ -2,33 +2,31 @@ // Jonathan Westhues, split Nov 2006 // Modified by Greg Jones, Jan 2009 // Modified by Adrian Dabrowski "atrox", Mar-Sept 2010,Oct 2011 +// Modified by piwi, Oct 2018 // // This code is licensed to you under the terms of the GNU GPL, version 2 or, // at your option, any later version. See the LICENSE.txt file for the text of // the license. //----------------------------------------------------------------------------- // Routines to support ISO 15693. This includes both the reader software and -// the `fake tag' modes, but at the moment I've implemented only the reader -// stuff, and that barely. -// Modified to perform modulation onboard in arm rather than on PC -// Also added additional reader commands (SELECT, READ etc.) +// the `fake tag' modes. //----------------------------------------------------------------------------- -// The ISO 15693 describes two transmission modes from reader to tag, and 4 -// transmission modes from tag to reader. As of Mar 2010 this code only -// supports one of each: "1of4" mode from reader to tag, and the highspeed -// variant with one subcarrier from card to reader. -// As long, as the card fully support ISO 15693 this is no problem, since the -// reader chooses both data rates, but some non-standard tags do not. Further for -// the simulation to work, we will need to support all data rates. + +// The ISO 15693 describes two transmission modes from reader to tag, and four +// transmission modes from tag to reader. As of Oct 2018 this code supports +// both reader modes and the high speed variant with one subcarrier from card to reader. +// As long as the card fully support ISO 15693 this is no problem, since the +// reader chooses both data rates, but some non-standard tags do not. +// For card simulation, the code supports both high and low speed modes with one subcarrier. // // VCD (reader) -> VICC (tag) // 1 out of 256: -// data rate: 1,66 kbit/s (fc/8192) +// data rate: 1,66 kbit/s (fc/8192) // used for long range // 1 out of 4: // data rate: 26,48 kbit/s (fc/512) // used for short range, high speed -// +// // VICC (tag) -> VCD (reader) // Modulation: // ASK / one subcarrier (423,75 khz) @@ -39,31 +37,29 @@ // high ASK: 26,48 kbit/s // high FSK: 26,69 kbit/s //----------------------------------------------------------------------------- -// added "1 out of 256" mode (for VCD->PICC) - atrox 20100911 // Random Remarks: // *) UID is always used "transmission order" (LSB), which is reverse to display order // TODO / BUGS / ISSUES: -// *) writing to tags takes longer: we miss the answer from the tag in most cases -// -> tweak the read-timeout times -// *) signal decoding from the card is still a bit shaky. -// *) signal decoding is unable to detect collissions. -// *) add anti-collission support for inventory-commands +// *) signal decoding is unable to detect collisions. +// *) add anti-collision support for inventory-commands // *) read security status of a block -// *) sniffing and simulation do only support one transmission mode. need to support -// all 8 transmission combinations -// *) remove or refactor code under "depricated" +// *) sniffing and simulation do not support two subcarrier modes. +// *) remove or refactor code under "deprecated" // *) document all the functions +#include "iso15693.h" #include "proxmark3.h" #include "util.h" #include "apps.h" #include "string.h" #include "iso15693tools.h" +#include "protocols.h" #include "cmd.h" +#include "BigBuf.h" #define arraylen(x) (sizeof(x)/sizeof((x)[0])) @@ -74,27 +70,27 @@ static int DEBUG = 0; // This section basicly contains transmission and receiving of bits /////////////////////////////////////////////////////////////////////// -#define FrameSOF Iso15693FrameSOF -#define Logic0 Iso15693Logic0 -#define Logic1 Iso15693Logic1 -#define FrameEOF Iso15693FrameEOF - #define Crc(data,datalen) Iso15693Crc(data,datalen) #define AddCrc(data,datalen) Iso15693AddCrc(data,datalen) #define sprintUID(target,uid) Iso15693sprintUID(target,uid) -// approximate amplitude=sqrt(ci^2+cq^2) -#define AMPLITUDE(ci, cq) (MAX(ABS(ci), ABS(cq)) + MIN(ABS(ci), ABS(cq))/2) +// buffers +#define ISO15693_DMA_BUFFER_SIZE 2048 // must be a power of 2 +#define ISO15693_MAX_RESPONSE_LENGTH 36 // allows read single block with the maximum block size of 256bits. Read multiple blocks not supported yet +#define ISO15693_MAX_COMMAND_LENGTH 45 // allows write single block with the maximum block size of 256bits. Write multiple blocks not supported yet -// DMA buffer -#define ISO15693_DMA_BUFFER_SIZE 128 +// timing. Delays in SSP_CLK ticks. +#define DELAY_READER_TO_ARM 8 +#define DELAY_ARM_TO_READER 1 +#define DELAY_ISO15693_VCD_TO_VICC 132 // 132/423.75kHz = 311.5us from end of EOF to start of tag response +#define DELAY_ISO15693_VICC_TO_VCD 1017 // 1017/3.39MHz = 300us between end of tag response and next reader command // --------------------------- -// Signal Processing +// Signal Processing // --------------------------- // prepare data using "1 out of 4" code for later transmission -// resulting data rate is 26,48 kbit/s (fc/512) +// resulting data rate is 26.48 kbit/s (fc/512) // cmd ... data // n ... length of data static void CodeIso15693AsReader(uint8_t *cmd, int n) @@ -179,7 +175,7 @@ static void CodeIso15693AsReader(uint8_t *cmd, int n) } // encode data using "1 out of 256" scheme -// data rate is 1,66 kbit/s (fc/8192) +// data rate is 1,66 kbit/s (fc/8192) // is designed for more robust communication over longer distances static void CodeIso15693AsReader256(uint8_t *cmd, int n) { @@ -201,7 +197,7 @@ static void CodeIso15693AsReader256(uint8_t *cmd, int n) ToSendStuffBit(1); ToSendStuffBit(1); ToSendStuffBit(0); - + for(i = 0; i < n; i++) { for (j = 0; j<=255; j++) { if (cmd[i]==j) { @@ -210,8 +206,8 @@ static void CodeIso15693AsReader256(uint8_t *cmd, int n) } else { ToSendStuffBit(1); ToSendStuffBit(1); - } - } + } + } } // EOF ToSendStuffBit(1); @@ -219,19 +215,64 @@ static void CodeIso15693AsReader256(uint8_t *cmd, int n) ToSendStuffBit(0); ToSendStuffBit(1); - // And slack at the end, too. - for(i = 0; i < 24; i++) { + // Fill remainder of last byte with 1 + for(i = 0; i < 4; i++) { ToSendStuffBit(1); } + + ToSendMax++; +} + + +static void CodeIso15693AsTag(uint8_t *cmd, int n) +{ + ToSendReset(); + + // SOF + ToSendStuffBit(0); + ToSendStuffBit(0); + ToSendStuffBit(0); + ToSendStuffBit(1); + ToSendStuffBit(1); + ToSendStuffBit(1); + ToSendStuffBit(0); + ToSendStuffBit(1); + + // data + for(int i = 0; i < n; i++) { + for(int j = 0; j < 8; j++) { + if ((cmd[i] >> j) & 0x01) { + ToSendStuffBit(0); + ToSendStuffBit(1); + } else { + ToSendStuffBit(1); + ToSendStuffBit(0); + } + } + } + + // EOF + ToSendStuffBit(1); + ToSendStuffBit(0); + ToSendStuffBit(1); + ToSendStuffBit(1); + ToSendStuffBit(1); + ToSendStuffBit(0); + ToSendStuffBit(0); + ToSendStuffBit(0); + + ToSendMax++; } // Transmit the command (to the tag) that was placed in cmd[]. -static void TransmitTo15693Tag(const uint8_t *cmd, int len) +static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time) { FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); + while (GetCountSspClk() < start_time); + LED_B_ON(); for(int c = 0; c < len; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { @@ -244,29 +285,51 @@ static void TransmitTo15693Tag(const uint8_t *cmd, int len) } //----------------------------------------------------------------------------- -// Transmit the command (to the reader) that was placed in cmd[]. +// Transmit the tag response (to the reader) that was placed in cmd[]. //----------------------------------------------------------------------------- -static void TransmitTo15693Reader(const uint8_t *cmd, int len) +static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, bool slow) { + // don't use the FPGA_HF_SIMULATOR_MODULATE_424K_8BIT minor mode. It would spoil GetCountSspClk() FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K); + uint8_t shift_delay = start_time & 0x00000007; + uint8_t bitmask = 0x00; + for (int i = 0; i < shift_delay; i++) { + bitmask |= (0x01 << i); + } + + while (GetCountSspClk() < (start_time & 0xfffffff8)) ; + + AT91C_BASE_SSC->SSC_THR = 0x00; // clear TXRDY + LED_C_ON(); - for(int c = 0; c < len; ) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = cmd[c]; - c++; + uint8_t bits_to_shift = 0x00; + for(size_t c = 0; c <= len; c++) { + uint8_t bits_to_send = bits_to_shift << (8 - shift_delay) | (c==len?0x00:cmd[c]) >> shift_delay; + bits_to_shift = cmd[c] & bitmask; + for (int i = 7; i >= 0; i--) { + for (int j = 0; j < (slow?4:1); ) { + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { + if (bits_to_send >> i & 0x01) { + AT91C_BASE_SSC->SSC_THR = 0xff; + } else { + AT91C_BASE_SSC->SSC_THR = 0x00; + } + j++; + } + WDT_HIT(); + } } - WDT_HIT(); } LED_C_OFF(); } //============================================================================= -// An ISO 15693 demodulator (one subcarrier only). Uses cross correlation to -// identify the SOF, each bit, and EOF. +// An ISO 15693 decoder for tag responses (one subcarrier only). +// Uses cross correlation to identify each bit and EOF. // This function is called 8 times per bit (every 2 subcarrier cycles). -// Subcarrier frequency fs is 424kHz, 1/fs = 2,36us, +// Subcarrier frequency fs is 424kHz, 1/fs = 2,36us, // i.e. function is called every 4,72us // LED handling: // LED C -> ON once we have received the SOF and are expecting the rest. @@ -276,16 +339,15 @@ static void TransmitTo15693Reader(const uint8_t *cmd, int len) // false if we are still waiting for some more //============================================================================= -#define SUBCARRIER_DETECT_THRESHOLD 2 -#define SOF_CORRELATOR_LEN (1<<5) +#define NOISE_THRESHOLD 160 // don't try to correlate noise -typedef struct Demod { +typedef struct DecodeTag { enum { - DEMOD_UNSYNCD, - DEMOD_AWAIT_SOF_1, - DEMOD_AWAIT_SOF_2, - DEMOD_RECEIVING_DATA, - DEMOD_AWAIT_EOF + STATE_TAG_SOF_LOW, + STATE_TAG_SOF_HIGH, + STATE_TAG_SOF_HIGH_END, + STATE_TAG_RECEIVING_DATA, + STATE_TAG_EOF } state; int bitCount; int posCount; @@ -296,382 +358,631 @@ typedef struct Demod { SOF_PART2 } lastBit; uint16_t shiftReg; + uint16_t max_len; uint8_t *output; int len; int sum1, sum2; - uint8_t SOF_low; - uint8_t SOF_high; - uint8_t SOF_last; - int32_t SOF_corr; - int32_t SOF_corr_prev; - uint8_t SOF_correlator[SOF_CORRELATOR_LEN]; -} Demod_t; - -static RAMFUNC int Handle15693SamplesDemod(int8_t ci, int8_t cq, Demod_t *Demod) +} DecodeTag_t; + + +static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag) { - switch(Demod->state) { - case DEMOD_UNSYNCD: - // initialize SOF correlator. We are looking for 12 samples low and 12 samples high. - Demod->SOF_low = 0; - Demod->SOF_high = 12; - Demod->SOF_last = 23; - memset(Demod->SOF_correlator, 0x00, Demod->SOF_last + 1); - Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq); - Demod->SOF_corr = Demod->SOF_correlator[Demod->SOF_last]; - Demod->SOF_corr_prev = Demod->SOF_corr; - // initialize Demodulator - Demod->posCount = 0; - Demod->bitCount = 0; - Demod->len = 0; - Demod->state = DEMOD_AWAIT_SOF_1; - break; - - case DEMOD_AWAIT_SOF_1: - // calculate the correlation in real time. Look at differences only. - Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_low++]; - Demod->SOF_corr -= 2*Demod->SOF_correlator[Demod->SOF_high++]; - Demod->SOF_last++; - Demod->SOF_low &= (SOF_CORRELATOR_LEN-1); - Demod->SOF_high &= (SOF_CORRELATOR_LEN-1); - Demod->SOF_last &= (SOF_CORRELATOR_LEN-1); - Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq); - Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_last]; - - // if correlation increases for 10 consecutive samples, we are close to maximum correlation - if (Demod->SOF_corr > Demod->SOF_corr_prev + SUBCARRIER_DETECT_THRESHOLD) { - Demod->posCount++; + switch(DecodeTag->state) { + case STATE_TAG_SOF_LOW: + // waiting for 12 times low (11 times low is accepted as well) + if (amplitude < NOISE_THRESHOLD) { + DecodeTag->posCount++; } else { - Demod->posCount = 0; + if (DecodeTag->posCount > 10) { + DecodeTag->posCount = 1; + DecodeTag->sum1 = 0; + DecodeTag->state = STATE_TAG_SOF_HIGH; + } else { + DecodeTag->posCount = 0; + } } - - if (Demod->posCount == 10) { // correlation increased 10 times - Demod->state = DEMOD_AWAIT_SOF_2; + break; + + case STATE_TAG_SOF_HIGH: + // waiting for 10 times high. Take average over the last 8 + if (amplitude > NOISE_THRESHOLD) { + DecodeTag->posCount++; + if (DecodeTag->posCount > 2) { + DecodeTag->sum1 += amplitude; // keep track of average high value + } + if (DecodeTag->posCount == 10) { + DecodeTag->sum1 >>= 4; // calculate half of average high value (8 samples) + DecodeTag->state = STATE_TAG_SOF_HIGH_END; + } + } else { // high phase was too short + DecodeTag->posCount = 1; + DecodeTag->state = STATE_TAG_SOF_LOW; } - - Demod->SOF_corr_prev = Demod->SOF_corr; - break; - case DEMOD_AWAIT_SOF_2: - // calculate the correlation in real time. Look at differences only. - Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_low++]; - Demod->SOF_corr -= 2*Demod->SOF_correlator[Demod->SOF_high++]; - Demod->SOF_last++; - Demod->SOF_low &= (SOF_CORRELATOR_LEN-1); - Demod->SOF_high &= (SOF_CORRELATOR_LEN-1); - Demod->SOF_last &= (SOF_CORRELATOR_LEN-1); - Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq); - Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_last]; - - if (Demod->SOF_corr >= Demod->SOF_corr_prev) { // we are looking for the maximum correlation - Demod->SOF_corr_prev = Demod->SOF_corr; - } else { - Demod->lastBit = SOF_PART1; // detected 1st part of SOF - Demod->sum1 = Demod->SOF_correlator[Demod->SOF_last]; - Demod->sum2 = 0; - Demod->posCount = 2; - Demod->state = DEMOD_RECEIVING_DATA; + case STATE_TAG_SOF_HIGH_END: + // waiting for a falling edge + if (amplitude < DecodeTag->sum1) { // signal drops below 50% average high: a falling edge + DecodeTag->lastBit = SOF_PART1; // detected 1st part of SOF (12 samples low and 12 samples high) + DecodeTag->shiftReg = 0; + DecodeTag->bitCount = 0; + DecodeTag->len = 0; + DecodeTag->sum1 = amplitude; + DecodeTag->sum2 = 0; + DecodeTag->posCount = 2; + DecodeTag->state = STATE_TAG_RECEIVING_DATA; LED_C_ON(); + } else { + DecodeTag->posCount++; + if (DecodeTag->posCount > 13) { // high phase too long + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } } - break; - case DEMOD_RECEIVING_DATA: - if (Demod->posCount == 1) { - Demod->sum1 = 0; - Demod->sum2 = 0; + case STATE_TAG_RECEIVING_DATA: + if (DecodeTag->posCount == 1) { + DecodeTag->sum1 = 0; + DecodeTag->sum2 = 0; } - - if (Demod->posCount <= 4) { - Demod->sum1 += AMPLITUDE(ci, cq); + if (DecodeTag->posCount <= 4) { + DecodeTag->sum1 += amplitude; } else { - Demod->sum2 += AMPLITUDE(ci, cq); + DecodeTag->sum2 += amplitude; } - - if (Demod->posCount == 8) { - int16_t corr_1 = (Demod->sum2 - Demod->sum1) / 4; - int16_t corr_0 = (Demod->sum1 - Demod->sum2) / 4; - int16_t corr_EOF = (Demod->sum1 + Demod->sum2) / 8; + if (DecodeTag->posCount == 8) { + int32_t corr_1 = DecodeTag->sum2 - DecodeTag->sum1; + int32_t corr_0 = -corr_1; + int32_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 2; if (corr_EOF > corr_0 && corr_EOF > corr_1) { - Demod->state = DEMOD_AWAIT_EOF; + if (DecodeTag->lastBit == LOGIC0) { // this was already part of EOF + DecodeTag->state = STATE_TAG_EOF; + } else { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } } else if (corr_1 > corr_0) { // logic 1 - if (Demod->lastBit == SOF_PART1) { // still part of SOF - Demod->lastBit = SOF_PART2; + if (DecodeTag->lastBit == SOF_PART1) { // still part of SOF + DecodeTag->lastBit = SOF_PART2; // SOF completed } else { - Demod->lastBit = LOGIC1; - Demod->shiftReg >>= 1; - Demod->shiftReg |= 0x80; - Demod->bitCount++; - if (Demod->bitCount == 8) { - Demod->output[Demod->len] = Demod->shiftReg; - Demod->len++; - Demod->bitCount = 0; - Demod->shiftReg = 0; + DecodeTag->lastBit = LOGIC1; + DecodeTag->shiftReg >>= 1; + DecodeTag->shiftReg |= 0x80; + DecodeTag->bitCount++; + if (DecodeTag->bitCount == 8) { + DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; + DecodeTag->len++; + if (DecodeTag->len > DecodeTag->max_len) { + // buffer overflow, give up + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } + DecodeTag->bitCount = 0; + DecodeTag->shiftReg = 0; } } } else { // logic 0 - if (Demod->lastBit == SOF_PART1) { // incomplete SOF - Demod->state = DEMOD_UNSYNCD; + if (DecodeTag->lastBit == SOF_PART1) { // incomplete SOF + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); } else { - Demod->lastBit = LOGIC0; - Demod->shiftReg >>= 1; - Demod->bitCount++; - if (Demod->bitCount == 8) { - Demod->output[Demod->len] = Demod->shiftReg; - Demod->len++; - Demod->bitCount = 0; - Demod->shiftReg = 0; + DecodeTag->lastBit = LOGIC0; + DecodeTag->shiftReg >>= 1; + DecodeTag->bitCount++; + if (DecodeTag->bitCount == 8) { + DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; + DecodeTag->len++; + if (DecodeTag->len > DecodeTag->max_len) { + // buffer overflow, give up + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } + DecodeTag->bitCount = 0; + DecodeTag->shiftReg = 0; } } } - Demod->posCount = 0; + DecodeTag->posCount = 0; } - Demod->posCount++; + DecodeTag->posCount++; break; - - case DEMOD_AWAIT_EOF: - if (Demod->lastBit == LOGIC0) { // this was already part of EOF - LED_C_OFF(); - return true; + + case STATE_TAG_EOF: + if (DecodeTag->posCount == 1) { + DecodeTag->sum1 = 0; + DecodeTag->sum2 = 0; + } + if (DecodeTag->posCount <= 4) { + DecodeTag->sum1 += amplitude; } else { - Demod->state = DEMOD_UNSYNCD; - LED_C_OFF(); + DecodeTag->sum2 += amplitude; } + if (DecodeTag->posCount == 8) { + int32_t corr_1 = DecodeTag->sum2 - DecodeTag->sum1; + int32_t corr_0 = -corr_1; + int32_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 2; + if (corr_EOF > corr_0 || corr_1 > corr_0) { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } else { + LED_C_OFF(); + return true; + } + } + DecodeTag->posCount++; break; - default: - Demod->state = DEMOD_UNSYNCD; - LED_C_OFF(); - break; } return false; } -static void DemodInit(Demod_t* Demod, uint8_t* data) +static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_len) { - Demod->output = data; - Demod->state = DEMOD_UNSYNCD; + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + DecodeTag->output = data; + DecodeTag->max_len = max_len; +} + + +static void DecodeTagReset(DecodeTag_t *DecodeTag) +{ + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; } /* - * Demodulate the samples we received from the tag, also log to tracebuffer + * Receive and decode the tag response, also log to tracebuffer */ -static int GetIso15693AnswerFromTag(uint8_t* response, int timeout) +static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int timeout) { - int maxBehindBy = 0; - int lastRxCounter, samples = 0; - int8_t ci, cq; + int samples = 0; bool gotFrame = false; - - // Allocate memory from BigBuf for some buffers - // free all previous allocations first - BigBuf_free(); - - // The DMA buffer, used to stream samples from the FPGA - uint16_t* dmaBuf = (uint16_t*) BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t)); - // the Demodulatur data structure - Demod_t* Demod = (Demod_t*) BigBuf_malloc(sizeof(Demod_t)); + uint16_t *dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); - // Set up the demodulator for tag -> reader responses. - DemodInit(Demod, response); + // the Decoder data structure + DecodeTag_t DecodeTag = { 0 }; + DecodeTagInit(&DecodeTag, response, max_len); // wait for last transfer to complete while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); // And put the FPGA in the appropriate mode - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_AMPLITUDE); // Setup and start DMA. FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); - uint16_t *upTo = dmaBuf; - lastRxCounter = ISO15693_DMA_BUFFER_SIZE; for(;;) { - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO15693_DMA_BUFFER_SIZE-1); - if(behindBy > maxBehindBy) { - maxBehindBy = behindBy; - } + uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); - if (behindBy < 1) continue; - - ci = (int8_t)(*upTo >> 8); - cq = (int8_t)(*upTo & 0xff); + if (behindBy == 0) continue; + + uint16_t tagdata = *upTo++; - upTo++; - lastRxCounter--; if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. upTo = dmaBuf; // start reading the circular buffer from the beginning - lastRxCounter += ISO15693_DMA_BUFFER_SIZE; + if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); + break; + } } if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers } + samples++; - if (Handle15693SamplesDemod(ci, cq, Demod)) { + if (Handle15693SamplesFromTag(tagdata, &DecodeTag)) { gotFrame = true; break; } - if(samples > timeout && Demod->state < DEMOD_RECEIVING_DATA) { - Demod->len = 0; + if (samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) { + DecodeTag.len = 0; break; } + } FpgaDisableSscDma(); + BigBuf_free(); + + if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", + samples, gotFrame, DecodeTag.state, DecodeTag.len, DecodeTag.bitCount, DecodeTag.posCount); - if (DEBUG) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.state = %d, Demod.len = %d, Demod.bitCount = %d, Demod.posCount = %d", - maxBehindBy, samples, gotFrame, Demod->state, Demod->len, Demod->bitCount, Demod->posCount); - - if (tracing && Demod->len > 0) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(Demod->output, Demod->len, 0, 0, parity, false); + if (DecodeTag.len > 0) { + LogTrace(DecodeTag.output, DecodeTag.len, 0, 0, NULL, false); } - return Demod->len; + return DecodeTag.len; } -// Now the GetISO15693 message from sniffing command -// TODO: fix it. This cannot work for several reasons: -// 1. Carrier is switched on during sniffing? -// 2. We most probable miss the next reader command when demodulating -static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) -{ - uint8_t *dest = BigBuf_get_addr(); +//============================================================================= +// An ISO15693 decoder for reader commands. +// +// This function is called 4 times per bit (every 2 subcarrier cycles). +// Subcarrier frequency fs is 848kHz, 1/fs = 1,18us, i.e. function is called every 2,36us +// LED handling: +// LED B -> ON once we have received the SOF and are expecting the rest. +// LED B -> OFF once we have received EOF or are in error state or unsynced +// +// Returns: true if we received a EOF +// false if we are still waiting for some more +//============================================================================= -// NOW READ RESPONSE - LED_D_ON(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - //spindelay(60); // greg - experiment to get rid of some of the 0 byte/failed reads - for(int c = 0; c < BIGBUF_SIZE; ) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - uint16_t iq = AT91C_BASE_SSC->SSC_RHR; - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates. We just want power, - // so abs(I) + abs(Q) is close to what we want. - int8_t i = (int8_t)(iq >> 8); - int8_t q = (int8_t)(iq & 0xff); - uint8_t r = AMPLITUDE(i, q); - dest[c++] = r; - } - } - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LED_D_OFF(); +typedef struct DecodeReader { + enum { + STATE_READER_UNSYNCD, + STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF, + STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF, + STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF, + STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4, + STATE_READER_RECEIVE_DATA_1_OUT_OF_4, + STATE_READER_RECEIVE_DATA_1_OUT_OF_256 + } state; + enum { + CODING_1_OUT_OF_4, + CODING_1_OUT_OF_256 + } Coding; + uint8_t shiftReg; + uint8_t bitCount; + int byteCount; + int byteCountMax; + int posCount; + int sum1, sum2; + uint8_t *output; +} DecodeReader_t; + + +static void DecodeReaderInit(DecodeReader_t* DecodeReader, uint8_t *data, uint16_t max_len) +{ + DecodeReader->output = data; + DecodeReader->byteCountMax = max_len; + DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReader->byteCount = 0; + DecodeReader->bitCount = 0; + DecodeReader->posCount = 1; + DecodeReader->shiftReg = 0; +} - ////////////////////////////////////////// - /////////// DEMODULATE /////////////////// - ////////////////////////////////////////// - int i, j; - int max = 0, maxPos=0; +static void DecodeReaderReset(DecodeReader_t* DecodeReader) +{ + DecodeReader->state = STATE_READER_UNSYNCD; +} - int skip = 2; - // First, correlate for SOF - for(i = 0; i < 38000; i++) { - int corr = 0; - for(j = 0; j < arraylen(FrameSOF); j += skip) { - corr += FrameSOF[j]*dest[i+(j/skip)]; - } - if(corr > max) { - max = corr; - maxPos = i; - } - } +static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uint8_t bit, DecodeReader_t *restrict DecodeReader) +{ + switch(DecodeReader->state) { + case STATE_READER_UNSYNCD: + if(!bit) { + // we went low, so this could be the beginning of a SOF + DecodeReader->posCount = 1; + DecodeReader->state = STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF; + } + break; - if (DEBUG) Dbprintf("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip)); + case STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF: + DecodeReader->posCount++; + if(bit) { // detected rising edge + if(DecodeReader->posCount < 4) { // rising edge too early (nominally expected at 5) + DecodeReaderReset(DecodeReader); + } else { // SOF + DecodeReader->state = STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF; + } + } else { + if(DecodeReader->posCount > 5) { // stayed low for too long + DecodeReaderReset(DecodeReader); + } else { + // do nothing, keep waiting + } + } + break; - int k = 0; // this will be our return value + case STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF: + DecodeReader->posCount++; + if(!bit) { // detected a falling edge + if (DecodeReader->posCount < 20) { // falling edge too early (nominally expected at 21 earliest) + DecodeReaderReset(DecodeReader); + } else if (DecodeReader->posCount < 23) { // SOF for 1 out of 4 coding + DecodeReader->Coding = CODING_1_OUT_OF_4; + DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; + } else if (DecodeReader->posCount < 28) { // falling edge too early (nominally expected at 29 latest) + DecodeReaderReset(DecodeReader); + } else { // SOF for 1 out of 4 coding + DecodeReader->Coding = CODING_1_OUT_OF_256; + DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; + } + } else { + if(DecodeReader->posCount > 29) { // stayed high for too long + DecodeReaderReset(DecodeReader); + } else { + // do nothing, keep waiting + } + } + break; - // greg - If correlation is less than 1 then there's little point in continuing - if ((max/(arraylen(FrameSOF)/skip)) >= 1) // THIS SHOULD BE 1 - { - - i = maxPos + arraylen(FrameSOF)/skip; - - uint8_t outBuf[20]; - memset(outBuf, 0, sizeof(outBuf)); - uint8_t mask = 0x01; - for(;;) { - int corr0 = 0, corr00 = 0, corr01 = 0, corr1 = 0, corrEOF = 0; - for(j = 0; j < arraylen(Logic0); j += skip) { - corr0 += Logic0[j]*dest[i+(j/skip)]; + case STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF: + DecodeReader->posCount++; + if (bit) { // detected rising edge + if (DecodeReader->Coding == CODING_1_OUT_OF_256) { + if (DecodeReader->posCount < 32) { // rising edge too early (nominally expected at 33) + DecodeReaderReset(DecodeReader); + } else { + DecodeReader->posCount = 1; + DecodeReader->bitCount = 0; + DecodeReader->byteCount = 0; + DecodeReader->sum1 = 1; + DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_256; + LED_B_ON(); + } + } else { // CODING_1_OUT_OF_4 + if (DecodeReader->posCount < 24) { // rising edge too early (nominally expected at 25) + DecodeReaderReset(DecodeReader); + } else { + DecodeReader->state = STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4; + } + } + } else { + if (DecodeReader->Coding == CODING_1_OUT_OF_256) { + if (DecodeReader->posCount > 34) { // signal stayed low for too long + DecodeReaderReset(DecodeReader); + } else { + // do nothing, keep waiting + } + } else { // CODING_1_OUT_OF_4 + if (DecodeReader->posCount > 26) { // signal stayed low for too long + DecodeReaderReset(DecodeReader); + } else { + // do nothing, keep waiting + } + } } - corr01 = corr00 = corr0; - for(j = 0; j < arraylen(Logic0); j += skip) { - corr00 += Logic0[j]*dest[i+arraylen(Logic0)/skip+(j/skip)]; - corr01 += Logic1[j]*dest[i+arraylen(Logic0)/skip+(j/skip)]; + break; + + case STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4: + DecodeReader->posCount++; + if (bit) { + if (DecodeReader->posCount == 33) { + DecodeReader->posCount = 1; + DecodeReader->bitCount = 0; + DecodeReader->byteCount = 0; + DecodeReader->sum1 = 1; + DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_4; + LED_B_ON(); + } else { + // do nothing, keep waiting + } + } else { // unexpected falling edge + DecodeReaderReset(DecodeReader); } - for(j = 0; j < arraylen(Logic1); j += skip) { - corr1 += Logic1[j]*dest[i+(j/skip)]; + break; + + case STATE_READER_RECEIVE_DATA_1_OUT_OF_4: + DecodeReader->posCount++; + if (DecodeReader->posCount == 1) { + DecodeReader->sum1 = bit; + } else if (DecodeReader->posCount <= 4) { + DecodeReader->sum1 += bit; + } else if (DecodeReader->posCount == 5) { + DecodeReader->sum2 = bit; + } else { + DecodeReader->sum2 += bit; } - for(j = 0; j < arraylen(FrameEOF); j += skip) { - corrEOF += FrameEOF[j]*dest[i+(j/skip)]; + if (DecodeReader->posCount == 8) { + DecodeReader->posCount = 0; + int corr10 = DecodeReader->sum1 - DecodeReader->sum2; + int corr01 = DecodeReader->sum2 - DecodeReader->sum1; + int corr11 = (DecodeReader->sum1 + DecodeReader->sum2) / 2; + if (corr01 > corr11 && corr01 > corr10) { // EOF + LED_B_OFF(); // Finished receiving + DecodeReaderReset(DecodeReader); + if (DecodeReader->byteCount != 0) { + return true; + } + } + if (corr10 > corr11) { // detected a 2bit position + DecodeReader->shiftReg >>= 2; + DecodeReader->shiftReg |= (DecodeReader->bitCount << 6); + } + if (DecodeReader->bitCount == 15) { // we have a full byte + DecodeReader->output[DecodeReader->byteCount++] = DecodeReader->shiftReg; + if (DecodeReader->byteCount > DecodeReader->byteCountMax) { + // buffer overflow, give up + LED_B_OFF(); + DecodeReaderReset(DecodeReader); + } + DecodeReader->bitCount = 0; + DecodeReader->shiftReg = 0; + } else { + DecodeReader->bitCount++; + } } - // Even things out by the length of the target waveform. - corr00 *= 2; - corr01 *= 2; - corr0 *= 4; - corr1 *= 4; - - if(corrEOF > corr1 && corrEOF > corr00 && corrEOF > corr01) { - if (DEBUG) Dbprintf("EOF at %d, correlation %d (corr01: %d, corr00: %d, corr1: %d, corr0: %d)", - i, corrEOF, corr01, corr00, corr1, corr0); - break; - } else if(corr1 > corr0) { - i += arraylen(Logic1)/skip; - outBuf[k] |= mask; + break; + + case STATE_READER_RECEIVE_DATA_1_OUT_OF_256: + DecodeReader->posCount++; + if (DecodeReader->posCount == 1) { + DecodeReader->sum1 = bit; + } else if (DecodeReader->posCount <= 4) { + DecodeReader->sum1 += bit; + } else if (DecodeReader->posCount == 5) { + DecodeReader->sum2 = bit; } else { - i += arraylen(Logic0)/skip; + DecodeReader->sum2 += bit; } - mask <<= 1; - if(mask == 0) { - k++; - mask = 0x01; + if (DecodeReader->posCount == 8) { + DecodeReader->posCount = 0; + int corr10 = DecodeReader->sum1 - DecodeReader->sum2; + int corr01 = DecodeReader->sum2 - DecodeReader->sum1; + int corr11 = (DecodeReader->sum1 + DecodeReader->sum2) / 2; + if (corr01 > corr11 && corr01 > corr10) { // EOF + LED_B_OFF(); // Finished receiving + DecodeReaderReset(DecodeReader); + if (DecodeReader->byteCount != 0) { + return true; + } + } + if (corr10 > corr11) { // detected the bit position + DecodeReader->shiftReg = DecodeReader->bitCount; + } + if (DecodeReader->bitCount == 255) { // we have a full byte + DecodeReader->output[DecodeReader->byteCount++] = DecodeReader->shiftReg; + if (DecodeReader->byteCount > DecodeReader->byteCountMax) { + // buffer overflow, give up + LED_B_OFF(); + DecodeReaderReset(DecodeReader); + } + } + DecodeReader->bitCount++; + } + break; + + default: + LED_B_OFF(); + DecodeReaderReset(DecodeReader); + break; + } + + return false; +} + + +//----------------------------------------------------------------------------- +// Receive a command (from the reader to us, where we are the simulated tag), +// and store it in the given buffer, up to the given maximum length. Keeps +// spinning, waiting for a well-framed command, until either we get one +// (returns true) or someone presses the pushbutton on the board (false). +// +// Assume that we're called with the SSC (to the FPGA) and ADC path set +// correctly. +//----------------------------------------------------------------------------- + +static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time) +{ + int samples = 0; + bool gotFrame = false; + uint8_t b; + + uint8_t *dmaBuf = BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE); + + // the decoder data structure + DecodeReader_t DecodeReader = {0}; + DecodeReaderInit(&DecodeReader, received, max_len); + + // wait for last transfer to complete + while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); + + LED_D_OFF(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); + + // clear receive register and wait for next transfer + uint32_t temp = AT91C_BASE_SSC->SSC_RHR; + (void) temp; + while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) ; + + uint32_t bit_time = GetCountSspClk() & 0xfffffff8; + + // Setup and start DMA. + FpgaSetupSscDma(dmaBuf, ISO15693_DMA_BUFFER_SIZE); + uint8_t *upTo = dmaBuf; + + for(;;) { + uint16_t behindBy = ((uint8_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); + + if (behindBy == 0) continue; + + b = *upTo++; + if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning + if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); + break; } - if((i+(int)arraylen(FrameEOF)/skip) >= BIGBUF_SIZE) { - DbpString("ran off end!"); + } + if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and + AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers + } + + for (int i = 7; i >= 0; i--) { + if (Handle15693SampleFromReader((b >> i) & 0x01, &DecodeReader)) { + *eof_time = bit_time + samples - DELAY_READER_TO_ARM; // end of EOF + gotFrame = true; break; } + samples++; } - if(mask != 0x01) { - DbpString("sniff: error, uneven octet! (discard extra bits!)"); - /// DbpString(" mask=%02x", mask); + + if (gotFrame) { + break; } - // uint8_t str1 [8]; - // itoa(k,str1); - // strncat(str1," octets read",8); - - // DbpString( str1); // DbpString("%d octets", k); - - // for(i = 0; i < k; i+=3) { - // //DbpString("# %2d: %02x ", i, outBuf[i]); - // DbpIntegers(outBuf[i],outBuf[i+1],outBuf[i+2]); - // } - - for(i = 0; i < k; i++) { - receivedResponse[i] = outBuf[i]; + + if (BUTTON_PRESS()) { + DecodeReader.byteCount = 0; + break; } - } // "end if correlation > 0" (max/(arraylen(FrameSOF)/skip)) - return k; // return the number of bytes demodulated -/// DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2)); + WDT_HIT(); + } + + + FpgaDisableSscDma(); + BigBuf_free_keep_EM(); + + if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", + samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount); + + if (DecodeReader.byteCount > 0) { + LogTrace(DecodeReader.output, DecodeReader.byteCount, 0, 0, NULL, true); + } + + return DecodeReader.byteCount; +} + + +// Encode (into the ToSend buffers) an identify request, which is the first +// thing that you must send to a tag to get a response. +static void BuildIdentifyRequest(void) +{ + uint8_t cmd[5]; + + uint16_t crc; + // one sub-carrier, inventory, 1 slot, fast rate + // AFI is at bit 5 (1<<4) when doing an INVENTORY + cmd[0] = (1 << 2) | (1 << 5) | (1 << 1); + // inventory command code + cmd[1] = 0x01; + // no mask + cmd[2] = 0x00; + //Now the CRC + crc = Crc(cmd, 3); + cmd[3] = crc & 0xff; + cmd[4] = crc >> 8; + + CodeIso15693AsReader(cmd, sizeof(cmd)); } -static void BuildIdentifyRequest(void); //----------------------------------------------------------------------------- // Start to read an ISO 15693 tag. We send an identify request, then wait // for the response. The response is not demodulated, just left in the buffer @@ -681,7 +992,7 @@ void AcquireRawAdcSamplesIso15693(void) { LEDsoff(); LED_A_ON(); - + uint8_t *dest = BigBuf_get_addr(); FpgaDownloadAndGo(FPGA_BITSTREAM_HF); @@ -712,18 +1023,12 @@ void AcquireRawAdcSamplesIso15693(void) while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_AMPLITUDE); for(int c = 0; c < 4000; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - uint16_t iq = AT91C_BASE_SSC->SSC_RHR; - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates. We just want power, - // so abs(I) + abs(Q) is close to what we want. - int8_t i = (int8_t)(iq >> 8); - int8_t q = (int8_t)(iq & 0xff); - uint8_t r = AMPLITUDE(i, q); - dest[c++] = r; + uint16_t r = AT91C_BASE_SSC->SSC_RHR; + dest[c++] = r >> 5; } } @@ -732,53 +1037,143 @@ void AcquireRawAdcSamplesIso15693(void) } -// TODO: there is no trigger condition. The 14000 samples represent a time frame of 66ms. -// It is unlikely that we get something meaningful. -// TODO: Currently we only record tag answers. Add tracing of reader commands. -// TODO: would we get something at all? The carrier is switched on... -void RecordRawAdcSamplesIso15693(void) +void SnoopIso15693(void) { - LEDsoff(); - LED_A_ON(); + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + BigBuf_free(); + + clear_trace(); + set_tracing(true); + + + // The DMA buffer, used to stream samples from the FPGA + uint16_t* dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); + uint16_t *upTo; + + // Count of samples received so far, so that we can include timing + // information in the trace buffer. + int samples = 0; + + DecodeTag_t DecodeTag = {0}; + uint8_t response[ISO15693_MAX_RESPONSE_LENGTH]; + DecodeTagInit(&DecodeTag, response, sizeof(response)); + + DecodeReader_t DecodeReader = {0};; + uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; + DecodeReaderInit(&DecodeReader, cmd, sizeof(cmd)); + + // Print some debug information about the buffer sizes + if (DEBUG) { + Dbprintf("Snooping buffers initialized:"); + Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen()); + Dbprintf(" Reader -> tag: %i bytes", ISO15693_MAX_COMMAND_LENGTH); + Dbprintf(" tag -> Reader: %i bytes", ISO15693_MAX_RESPONSE_LENGTH); + Dbprintf(" DMA: %i bytes", ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t)); + } + Dbprintf("Snoop started. Press button to stop."); - uint8_t *dest = BigBuf_get_addr(); + // Signal field is off, no reader signal, no tag signal + LEDsoff(); + // And put the FPGA in the appropriate mode + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_SNOOP | FPGA_HF_READER_RX_XCORR_AMPLITUDE); + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - // Setup SSC + // Setup for the DMA. FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); - // Start from off (no field generated) - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); + bool TagIsActive = false; + bool ReaderIsActive = false; + bool ExpectTagAnswer = false; - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + // And now we loop, receiving samples. + for(;;) { + uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); - SpinDelay(100); + if (behindBy == 0) continue; - LED_D_ON(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + uint16_t snoopdata = *upTo++; - for(int c = 0; c < 14000;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - uint16_t iq = AT91C_BASE_SSC->SSC_RHR; - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates. We just want power, - // so abs(I) + abs(Q) is close to what we want. - int8_t i = (int8_t)(iq >> 8); - int8_t q = (int8_t)(iq & 0xff); - uint8_t r = AMPLITUDE(i, q); - dest[c++] = r; + if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning + if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d, samples=%d", behindBy, samples); + break; + } + if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and + AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers + WDT_HIT(); + if(BUTTON_PRESS()) { + DbpString("Snoop stopped."); + break; + } + } + } + samples++; + + if (!TagIsActive) { // no need to try decoding reader data if the tag is sending + if (Handle15693SampleFromReader(snoopdata & 0x02, &DecodeReader)) { + FpgaDisableSscDma(); + ExpectTagAnswer = true; + LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); + /* And ready to receive another command. */ + DecodeReaderReset(&DecodeReader); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DecodeTagReset(&DecodeTag); + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + } + if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) { + FpgaDisableSscDma(); + ExpectTagAnswer = true; + LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); + /* And ready to receive another command. */ + DecodeReaderReset(&DecodeReader); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DecodeTagReset(&DecodeTag); + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + } + ReaderIsActive = (DecodeReader.state >= STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF); + } + + if (!ReaderIsActive && ExpectTagAnswer) { // no need to try decoding tag data if the reader is currently sending or no answer expected yet + if (Handle15693SamplesFromTag(snoopdata >> 2, &DecodeTag)) { + FpgaDisableSscDma(); + //Use samples as a time measurement + LogTrace(DecodeTag.output, DecodeTag.len, samples, samples, NULL, false); + // And ready to receive another response. + DecodeTagReset(&DecodeTag); + DecodeReaderReset(&DecodeReader); + ExpectTagAnswer = false; + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + } + TagIsActive = (DecodeTag.state >= STATE_TAG_RECEIVING_DATA); } + } - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LED_D_OFF(); - Dbprintf("finished recording"); - LED_A_OFF(); + FpgaDisableSscDma(); + BigBuf_free(); + + LEDsoff(); + + DbpString("Snoop statistics:"); + Dbprintf(" ExpectTagAnswer: %d", ExpectTagAnswer); + Dbprintf(" DecodeTag State: %d", DecodeTag.state); + Dbprintf(" DecodeTag byteCnt: %d", DecodeTag.len); + Dbprintf(" DecodeReader State: %d", DecodeReader.state); + Dbprintf(" DecodeReader byteCnt: %d", DecodeReader.byteCount); + Dbprintf(" Trace length: %d", BigBuf_get_traceLen()); } -// Initialize the proxmark as iso15k reader +// Initialize the proxmark as iso15k reader // (this might produces glitches that confuse some tags static void Iso15693InitReader() { FpgaDownloadAndGo(FPGA_BITSTREAM_HF); @@ -804,27 +1199,6 @@ static void Iso15693InitReader() { // This section basically contains transmission and receiving of bits /////////////////////////////////////////////////////////////////////// -// Encode (into the ToSend buffers) an identify request, which is the first -// thing that you must send to a tag to get a response. -static void BuildIdentifyRequest(void) -{ - uint8_t cmd[5]; - - uint16_t crc; - // one sub-carrier, inventory, 1 slot, fast rate - // AFI is at bit 5 (1<<4) when doing an INVENTORY - cmd[0] = (1 << 2) | (1 << 5) | (1 << 1); - // inventory command code - cmd[1] = 0x01; - // no mask - cmd[2] = 0x00; - //Now the CRC - crc = Crc(cmd, 3); - cmd[3] = crc & 0xff; - cmd[4] = crc >> 8; - - CodeIso15693AsReader(cmd, sizeof(cmd)); -} // uid is in transmission order (which is reverse of display order) static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) @@ -832,12 +1206,11 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) uint8_t cmd[13]; uint16_t crc; - // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block - // followed by teh block data - // one sub-carrier, inventory, 1 slot, fast rate - cmd[0] = (1 << 6)| (1 << 5) | (1 << 1); // no SELECT bit, ADDR bit, OPTION bit + // If we set the Option_Flag in this request, the VICC will respond with the security status of the block + // followed by the block data + cmd[0] = ISO15693_REQ_OPTION | ISO15693_REQ_ADDRESS | ISO15693_REQ_DATARATE_HIGH; // READ BLOCK command code - cmd[1] = 0x20; + cmd[1] = ISO15693_READBLOCK; // UID may be optionally specified here // 64-bit UID cmd[2] = uid[0]; @@ -849,9 +1222,9 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) cmd[8] = uid[6]; cmd[9] = uid[7]; // 0xe0; // always e0 (not exactly unique) // Block number to read - cmd[10] = blockNumber;//0x00; + cmd[10] = blockNumber; //Now the CRC - crc = Crc(cmd, 11); // the crc needs to be calculated over 12 bytes + crc = Crc(cmd, 11); // the crc needs to be calculated over 11 bytes cmd[11] = crc & 0xff; cmd[12] = crc >> 8; @@ -860,15 +1233,13 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) // Now the VICC>VCD responses when we are simulating a tag -static void BuildInventoryResponse( uint8_t *uid) +static void BuildInventoryResponse(uint8_t *uid) { uint8_t cmd[12]; uint16_t crc; - // one sub-carrier, inventory, 1 slot, fast rate - // AFI is at bit 5 (1<<4) when doing an INVENTORY - //(1 << 2) | (1 << 5) | (1 << 1); - cmd[0] = 0; // + + cmd[0] = 0; // No error, no protocol format extension cmd[1] = 0; // DSFID (data storage format identifier). 0x00 = not supported // 64-bit UID cmd[2] = uid[7]; //0x32; @@ -884,26 +1255,23 @@ static void BuildInventoryResponse( uint8_t *uid) cmd[10] = crc & 0xff; cmd[11] = crc >> 8; - CodeIso15693AsReader(cmd, sizeof(cmd)); + CodeIso15693AsTag(cmd, sizeof(cmd)); } // Universal Method for sending to and recv bytes from a tag // init ... should we initialize the reader? -// speed ... 0 low speed, 1 hi speed -// **recv will return you a pointer to the received data -// If you do not need the answer use NULL for *recv[] +// speed ... 0 low speed, 1 hi speed +// *recv will contain the tag's answer // return: lenght of received data -int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv) { +int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t *recv, uint16_t max_recv_len, uint32_t start_time) { LED_A_ON(); LED_B_OFF(); LED_C_OFF(); - + if (init) Iso15693InitReader(); int answerLen=0; - uint8_t *answer = BigBuf_get_addr() + 4000; - if (recv != NULL) memset(answer, 0, 100); if (!speed) { // low speed (1 out of 256) @@ -912,22 +1280,22 @@ int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv // high speed (1 out of 4) CodeIso15693AsReader(send, sendlen); } - - TransmitTo15693Tag(ToSend,ToSendMax); + + TransmitTo15693Tag(ToSend, ToSendMax, start_time); + // Now wait for a response - if (recv!=NULL) { - answerLen = GetIso15693AnswerFromTag(answer, 100); - *recv=answer; + if (recv != NULL) { + answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, DELAY_ISO15693_VCD_TO_VICC * 2); } LED_A_OFF(); - + return answerLen; } // -------------------------------------------------------------------- -// Debug Functions +// Debug Functions // -------------------------------------------------------------------- // Decodes a message from a tag and displays its metadata and content @@ -936,53 +1304,53 @@ void DbdecodeIso15693Answer(int len, uint8_t *d) { char status[DBD15STATLEN+1]={0}; uint16_t crc; - if (len>3) { - if (d[0]&(1<<3)) - strncat(status,"ProtExt ",DBD15STATLEN); - if (d[0]&1) { + if (len > 3) { + if (d[0] & ISO15693_RES_EXT) + strncat(status,"ProtExt ", DBD15STATLEN); + if (d[0] & ISO15693_RES_ERROR) { // error - strncat(status,"Error ",DBD15STATLEN); + strncat(status,"Error ", DBD15STATLEN); switch (d[1]) { - case 0x01: - strncat(status,"01:notSupp",DBD15STATLEN); + case 0x01: + strncat(status,"01:notSupp", DBD15STATLEN); break; - case 0x02: - strncat(status,"02:notRecog",DBD15STATLEN); + case 0x02: + strncat(status,"02:notRecog", DBD15STATLEN); break; - case 0x03: - strncat(status,"03:optNotSupp",DBD15STATLEN); + case 0x03: + strncat(status,"03:optNotSupp", DBD15STATLEN); break; - case 0x0f: - strncat(status,"0f:noInfo",DBD15STATLEN); + case 0x0f: + strncat(status,"0f:noInfo", DBD15STATLEN); break; - case 0x10: - strncat(status,"10:dontExist",DBD15STATLEN); + case 0x10: + strncat(status,"10:doesn'tExist", DBD15STATLEN); break; - case 0x11: - strncat(status,"11:lockAgain",DBD15STATLEN); + case 0x11: + strncat(status,"11:lockAgain", DBD15STATLEN); break; - case 0x12: - strncat(status,"12:locked",DBD15STATLEN); + case 0x12: + strncat(status,"12:locked", DBD15STATLEN); break; - case 0x13: - strncat(status,"13:progErr",DBD15STATLEN); + case 0x13: + strncat(status,"13:progErr", DBD15STATLEN); break; - case 0x14: - strncat(status,"14:lockErr",DBD15STATLEN); + case 0x14: + strncat(status,"14:lockErr", DBD15STATLEN); break; default: - strncat(status,"unknownErr",DBD15STATLEN); + strncat(status,"unknownErr", DBD15STATLEN); } - strncat(status," ",DBD15STATLEN); + strncat(status," ", DBD15STATLEN); } else { - strncat(status,"NoErr ",DBD15STATLEN); + strncat(status,"NoErr ", DBD15STATLEN); } - + crc=Crc(d,len-2); - if ( (( crc & 0xff ) == d[len-2]) && (( crc >> 8 ) == d[len-1]) ) + if ( (( crc & 0xff ) == d[len-2]) && (( crc >> 8 ) == d[len-1]) ) strncat(status,"CrcOK",DBD15STATLEN); else - strncat(status,"CrcFail!",DBD15STATLEN); + strncat(status,"CrcFail!",DBD15STATLEN); Dbprintf("%s",status); } @@ -1000,6 +1368,7 @@ void SetDebugIso15693(uint32_t debug) { return; } + //----------------------------------------------------------------------------- // Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector // all demodulation performed in arm rather than host. - greg @@ -1009,13 +1378,14 @@ void ReaderIso15693(uint32_t parameter) LEDsoff(); LED_A_ON(); - int answerLen1 = 0; + set_tracing(true); + + int answerLen = 0; uint8_t TagUID[8] = {0x00}; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - uint8_t *answer1 = BigBuf_get_addr() + 4000; - memset(answer1, 0x00, 200); + uint8_t answer[ISO15693_MAX_RESPONSE_LENGTH]; SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Setup SSC @@ -1029,37 +1399,39 @@ void ReaderIso15693(uint32_t parameter) LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); SpinDelay(200); + StartCountSspClk(); + // FIRST WE RUN AN INVENTORY TO GET THE TAG UID // THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME // Now send the IDENTIFY command BuildIdentifyRequest(); - - TransmitTo15693Tag(ToSend,ToSendMax); - + TransmitTo15693Tag(ToSend, ToSendMax, 0); + // Now wait for a response - answerLen1 = GetIso15693AnswerFromTag(answer1, 100) ; + answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC * 2) ; + uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD; - if (answerLen1 >=12) // we should do a better check than this + if (answerLen >=12) // we should do a better check than this { - TagUID[0] = answer1[2]; - TagUID[1] = answer1[3]; - TagUID[2] = answer1[4]; - TagUID[3] = answer1[5]; - TagUID[4] = answer1[6]; - TagUID[5] = answer1[7]; - TagUID[6] = answer1[8]; // IC Manufacturer code - TagUID[7] = answer1[9]; // always E0 + TagUID[0] = answer[2]; + TagUID[1] = answer[3]; + TagUID[2] = answer[4]; + TagUID[3] = answer[5]; + TagUID[4] = answer[6]; + TagUID[5] = answer[7]; + TagUID[6] = answer[8]; // IC Manufacturer code + TagUID[7] = answer[9]; // always E0 } - Dbprintf("%d octets read from IDENTIFY request:", answerLen1); - DbdecodeIso15693Answer(answerLen1,answer1); - Dbhexdump(answerLen1,answer1,true); + Dbprintf("%d octets read from IDENTIFY request:", answerLen); + DbdecodeIso15693Answer(answerLen, answer); + Dbhexdump(answerLen, answer, false); // UID is reverse - if (answerLen1 >= 12) + if (answerLen >= 12) Dbprintf("UID = %02hX%02hX%02hX%02hX%02hX%02hX%02hX%02hX", TagUID[7],TagUID[6],TagUID[5],TagUID[4], TagUID[3],TagUID[2],TagUID[1],TagUID[0]); @@ -1074,74 +1446,69 @@ void ReaderIso15693(uint32_t parameter) // Dbhexdump(answerLen3,answer3,true); // read all pages - if (answerLen1 >= 12 && DEBUG) { - uint8_t *answer2 = BigBuf_get_addr() + 4100; - int i=0; - while (i<32) { // sanity check, assume max 32 pages - BuildReadBlockRequest(TagUID,i); - TransmitTo15693Tag(ToSend,ToSendMax); - int answerLen2 = GetIso15693AnswerFromTag(answer2, 100); - if (answerLen2>0) { - Dbprintf("READ SINGLE BLOCK %d returned %d octets:",i,answerLen2); - DbdecodeIso15693Answer(answerLen2,answer2); - Dbhexdump(answerLen2,answer2,true); - if ( *((uint32_t*) answer2) == 0x07160101 ) break; // exit on NoPageErr - } + if (answerLen >= 12 && DEBUG) { + + // debugptr = BigBuf_get_addr(); + + int i = 0; + while (i < 32) { // sanity check, assume max 32 pages + BuildReadBlockRequest(TagUID, i); + TransmitTo15693Tag(ToSend, ToSendMax, start_time); + int answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC * 2); + start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD; + if (answerLen > 0) { + Dbprintf("READ SINGLE BLOCK %d returned %d octets:", i, answerLen); + DbdecodeIso15693Answer(answerLen, answer); + Dbhexdump(answerLen, answer, false); + if ( *((uint32_t*) answer) == 0x07160101 ) break; // exit on NoPageErr + } i++; - } + } } - // for the time being, switch field off to protect rdv4.0 + // for the time being, switch field off to protect rdv4.0 // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); - + LED_A_OFF(); } -// Simulate an ISO15693 TAG, perform anti-collision and then print any reader commands -// all demodulation performed in arm rather than host. - greg + +// Simulate an ISO15693 TAG. +// For Inventory command: print command and send Inventory Response with given UID +// TODO: interpret other reader commands and send appropriate response void SimTagIso15693(uint32_t parameter, uint8_t *uid) { LEDsoff(); LED_A_ON(); - int answerLen1 = 0; - int samples = 0; - int elapsed = 0; - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - - uint8_t *buf = BigBuf_get_addr() + 4000; - memset(buf, 0x00, 100); - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR); - // Start from off (no field generated) - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); + StartCountSspClk(); - // Listen to reader - answerLen1 = GetIso15693AnswerFromSniff(buf, 100, &samples, &elapsed) ; + uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; - if (answerLen1 >=1) // we should do a better check than this - { - // Build a suitable reponse to the reader INVENTORY cocmmand - // not so obsvious, but in the call to BuildInventoryResponse, the command is copied to the global ToSend buffer used below. - - BuildInventoryResponse(uid); - - TransmitTo15693Reader(ToSend,ToSendMax); - } + // Build a suitable response to the reader INVENTORY command + BuildInventoryResponse(uid); - Dbprintf("%d octets read from reader command: %x %x %x %x %x %x %x %x %x", answerLen1, - buf[0], buf[1], buf[2], buf[3], - buf[4], buf[5], buf[6], buf[7], buf[8]); + // Listen to reader + while (!BUTTON_PRESS()) { + uint32_t eof_time = 0, start_time = 0; + int cmd_len = GetIso15693CommandFromReader(cmd, sizeof(cmd), &eof_time); + + if ((cmd_len >= 5) && (cmd[0] & ISO15693_REQ_INVENTORY) && (cmd[1] == ISO15693_INVENTORY)) { // TODO: check more flags + bool slow = !(cmd[0] & ISO15693_REQ_DATARATE_HIGH); + start_time = eof_time + DELAY_ISO15693_VCD_TO_VICC - DELAY_ARM_TO_READER; + TransmitTo15693Reader(ToSend, ToSendMax, start_time, slow); + } - Dbprintf("Simulationg uid: %x %x %x %x %x %x %x %x", - uid[0], uid[1], uid[2], uid[3], - uid[4], uid[5], uid[6], uid[7]); + Dbprintf("%d bytes read from reader:", cmd_len); + Dbhexdump(cmd_len, cmd, false); + } LEDsoff(); } @@ -1149,50 +1516,52 @@ void SimTagIso15693(uint32_t parameter, uint8_t *uid) // Since there is no standardized way of reading the AFI out of a tag, we will brute force it // (some manufactures offer a way to read the AFI, though) -void BruteforceIso15693Afi(uint32_t speed) -{ +void BruteforceIso15693Afi(uint32_t speed) +{ LEDsoff(); LED_A_ON(); + + uint8_t data[6]; + uint8_t recv[ISO15693_MAX_RESPONSE_LENGTH]; - uint8_t data[20]; - uint8_t *recv=data; int datalen=0, recvlen=0; - + Iso15693InitReader(); + StartCountSspClk(); // first without AFI - // Tags should respond wihtout AFI and with AFI=0 even when AFI is active - - data[0]=ISO15_REQ_SUBCARRIER_SINGLE | ISO15_REQ_DATARATE_HIGH | - ISO15_REQ_INVENTORY | ISO15_REQINV_SLOT1; - data[1]=ISO15_CMD_INVENTORY; - data[2]=0; // mask length - datalen=AddCrc(data,3); - recvlen=SendDataTag(data, datalen, false, speed, &recv); + // Tags should respond without AFI and with AFI=0 even when AFI is active + + data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_SLOT1; + data[1] = ISO15693_INVENTORY; + data[2] = 0; // mask length + datalen = AddCrc(data,3); + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), 0); + uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VCD_TO_VICC; WDT_HIT(); if (recvlen>=12) { - Dbprintf("NoAFI UID=%s",sprintUID(NULL,&recv[2])); + Dbprintf("NoAFI UID=%s", sprintUID(NULL, &recv[2])); } - + // now with AFI - - data[0]=ISO15_REQ_SUBCARRIER_SINGLE | ISO15_REQ_DATARATE_HIGH | - ISO15_REQ_INVENTORY | ISO15_REQINV_AFI | ISO15_REQINV_SLOT1; - data[1]=ISO15_CMD_INVENTORY; - data[2]=0; // AFI - data[3]=0; // mask length - - for (int i=0;i<256;i++) { - data[2]=i & 0xFF; - datalen=AddCrc(data,4); - recvlen=SendDataTag(data, datalen, false, speed, &recv); + + data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_AFI | ISO15693_REQINV_SLOT1; + data[1] = ISO15693_INVENTORY; + data[2] = 0; // AFI + data[3] = 0; // mask length + + for (int i = 0; i < 256; i++) { + data[2] = i & 0xFF; + datalen = AddCrc(data,4); + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time); + start_time = GetCountSspClk() + DELAY_ISO15693_VCD_TO_VICC; WDT_HIT(); - if (recvlen>=12) { - Dbprintf("AFI=%i UID=%s",i,sprintUID(NULL,&recv[2])); + if (recvlen >= 12) { + Dbprintf("AFI=%i UID=%s", i, sprintUID(NULL, &recv[2])); } - } + } Dbprintf("AFI Bruteforcing done."); - + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LEDsoff(); } @@ -1200,33 +1569,34 @@ void BruteforceIso15693Afi(uint32_t speed) // Allows to directly send commands to the tag via the client void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint8_t data[]) { - int recvlen=0; - uint8_t *recvbuf = BigBuf_get_addr(); - + int recvlen = 0; + uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; + LED_A_ON(); - + if (DEBUG) { - Dbprintf("SEND"); - Dbhexdump(datalen,data,true); + Dbprintf("SEND:"); + Dbhexdump(datalen, data, false); } - - recvlen = SendDataTag(data, datalen, true, speed, (recv?&recvbuf:NULL)); - if (recv) { - cmd_send(CMD_ACK, recvlen>48?48:recvlen, 0, 0, recvbuf, 48); - + recvlen = SendDataTag(data, datalen, true, speed, (recv?recvbuf:NULL), sizeof(recvbuf), 0); + + if (recv) { if (DEBUG) { - Dbprintf("RECV"); - DbdecodeIso15693Answer(recvlen,recvbuf); - Dbhexdump(recvlen,recvbuf,true); + Dbprintf("RECV:"); + Dbhexdump(recvlen, recvbuf, false); + DbdecodeIso15693Answer(recvlen, recvbuf); } + + cmd_send(CMD_ACK, recvlen>ISO15693_MAX_RESPONSE_LENGTH?ISO15693_MAX_RESPONSE_LENGTH:recvlen, 0, 0, recvbuf, ISO15693_MAX_RESPONSE_LENGTH); + } - // for the time being, switch field off to protect rdv4.0 + // for the time being, switch field off to protect rdv4.0 // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); - + LED_A_OFF(); }