X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/6a5d4e17f4afe29f84308fe5ca78782233d7b611..refs/pull/862/head:/armsrc/iso15693.c?ds=inline diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c index c092b383..85af0859 100644 --- a/armsrc/iso15693.c +++ b/armsrc/iso15693.c @@ -2,97 +2,86 @@ // 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) -// used for long range +// 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 -// +// 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) -// FSK / two subcarriers (423,75 khz && 484,28 khz) +// ASK / one subcarrier (423,75 khz) +// FSK / two subcarriers (423,75 khz && 484,28 khz) // Data Rates / Modes: -// low ASK: 6,62 kbit/s -// low FSK: 6.67 kbit/s -// high ASK: 26,48 kbit/s -// high FSK: 26,69 kbit/s +// low ASK: 6,62 kbit/s +// low FSK: 6.67 kbit/s +// 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" +#include "fpgaloader.h" #define arraylen(x) (sizeof(x)/sizeof((x)[0])) +static int DEBUG = 0; + /////////////////////////////////////////////////////////////////////// // ISO 15693 Part 2 - Air Interface -// This section basicly contains transmission and receiving of bits +// This section basically 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))>>1)) - -static int DEBUG = 0; - +// 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 // --------------------------- -// 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) @@ -168,14 +157,16 @@ static void CodeIso15693AsReader(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++; } -// encode data using "1 out of 256" sheme -// data rate is 1,66 kbit/s (fc/8192) +// encode data using "1 out of 256" scheme +// 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) { @@ -197,7 +188,7 @@ 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) { @@ -206,8 +197,8 @@ static void CodeIso15693AsReader256(uint8_t *cmd, int n) } else { ToSendStuffBit(1); ToSendStuffBit(1); - } - } + } + } } // EOF ToSendStuffBit(1); @@ -215,333 +206,836 @@ 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++; } -// Transmit the command (to the tag) that was placed in ToSend[]. -static void TransmitTo15693Tag(const uint8_t *cmd, int len, int *samples, int *wait) -{ - int c; - - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); - if(*wait < 10) { *wait = 10; } - - c = 0; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = ~cmd[c]; - c++; - if(c >= len) { - break; - } - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; - (void)r; - } - WDT_HIT(); - } - *samples = (c + *wait) << 3; +// static uint8_t encode4Bits(const uint8_t b) { + // uint8_t c = b & 0xF; + // // OTA, the least significant bits first + // // The columns are + // // 1 - Bit value to send + // // 2 - Reversed (big-endian) + // // 3 - Manchester Encoded + // // 4 - Hex values + + // switch(c){ + // // 1 2 3 4 + // case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55 + // case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95 + // case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65 + // case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5 + // case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59 + // case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99 + // case 9: return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69 + // case 8: return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9 + // case 7: return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56 + // case 6: return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96 + // case 5: return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66 + // case 4: return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6 + // case 3: return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a + // case 2: return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a + // case 1: return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a + // default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa + + // } +// } + +static const uint8_t encode_4bits[16] = { 0xaa, 0x6a, 0x9a, 0x5a, 0xa6, 0x66, 0x96, 0x56, 0xa9, 0x69, 0x99, 0x59, 0xa5, 0x65, 0x95, 0x55 }; + +void CodeIso15693AsTag(uint8_t *cmd, size_t len) { + /* + * SOF comprises 3 parts; + * * An unmodulated time of 56.64 us + * * 24 pulses of 423.75 kHz (fc/32) + * * A logic 1, which starts with an unmodulated time of 18.88us + * followed by 8 pulses of 423.75kHz (fc/32) + * + * EOF comprises 3 parts: + * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated + * time of 18.88us. + * - 24 pulses of fc/32 + * - An unmodulated time of 56.64 us + * + * A logic 0 starts with 8 pulses of fc/32 + * followed by an unmodulated time of 256/fc (~18,88us). + * + * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by + * 8 pulses of fc/32 (also 18.88us) + * + * A bit here becomes 8 pulses of fc/32. Therefore: + * The SOF can be written as 00011101 = 0x1D + * The EOF can be written as 10111000 = 0xb8 + * A logic 1 is 01 + * A logic 0 is 10 + * + * */ + + ToSendReset(); + + // SOF + ToSend[++ToSendMax] = 0x1D; // 00011101 + + // data + for (int i = 0; i < len; i++) { + ToSend[++ToSendMax] = encode_4bits[cmd[i] & 0xF]; + ToSend[++ToSendMax] = encode_4bits[cmd[i] >> 4]; + } + + // EOF + ToSend[++ToSendMax] = 0xB8; // 10111000 + + ToSendMax++; } -//----------------------------------------------------------------------------- -// Transmit the command (to the reader) that was placed in ToSend[]. -//----------------------------------------------------------------------------- -static void TransmitTo15693Reader(const uint8_t *cmd, int len, int *samples, int *wait) + +// Transmit the command (to the tag) that was placed in cmd[]. +static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time) { - int c = 0; - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K); - if(*wait < 10) { *wait = 10; } - - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = cmd[c]; - c++; - if(c >= len) { - break; - } - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; - (void)r; - } - WDT_HIT(); - } - *samples = (c + *wait) << 3; + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_FULL_MOD); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + + while (GetCountSspClk() < start_time) ; + + LED_B_ON(); + for(int c = 0; c < len; c++) { + uint8_t data = cmd[c]; + for (int i = 0; i < 8; i++) { + uint16_t send_word = (data & 0x80) ? 0x0000 : 0xffff; + while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ; + AT91C_BASE_SSC->SSC_THR = send_word; + while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ; + AT91C_BASE_SSC->SSC_THR = send_word; + data <<= 1; + } + WDT_HIT(); + } + LED_B_OFF(); } -// Read from Tag -// Parameters: -// receivedResponse -// maxLen -// samples -// elapsed -// returns: -// number of decoded bytes -static int GetIso15693AnswerFromTag(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) -{ - int c = 0; - uint8_t *dest = BigBuf_get_addr(); +//----------------------------------------------------------------------------- +// Transmit the tag response (to the reader) that was placed in cmd[]. +//----------------------------------------------------------------------------- +void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t *start_time, uint32_t slot_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); -// NOW READ RESPONSE - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - c = 0; - for(;;) { - 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. - int8_t i = iq >> 8; - int8_t q = iq; - uint8_t r = AMPLITUDE(i, q); - - dest[c++] = r; - - if(c >= 4000) { - break; - } + uint32_t modulation_start_time = *start_time + 3 * 8; // no need to transfer the unmodulated start of SOF + + while (GetCountSspClk() > (modulation_start_time & 0xfffffff8) + 3) { // we will miss the intended time + if (slot_time) { + modulation_start_time += slot_time; // use next available slot + } else { + modulation_start_time = (modulation_start_time & 0xfffffff8) + 8; // next possible time } } - ////////////////////////////////////////// - /////////// DEMODULATE /////////////////// - ////////////////////////////////////////// + while (GetCountSspClk() < (modulation_start_time & 0xfffffff8)) + /* wait */ ; - int i, j; - int max = 0, maxPos=0; + uint8_t shift_delay = modulation_start_time & 0x00000007; - int skip = 2; + *start_time = modulation_start_time - 3 * 8; - // First, correlate for SOF - for(i = 0; i < 200; i++) { // usually, SOF is found around i = 60 - int corr = 0; - for(j = 0; j < arraylen(FrameSOF); j += skip) { - corr += FrameSOF[j]*dest[i+(j/skip)]; + LED_C_ON(); + uint8_t bits_to_shift = 0x00; + uint8_t bits_to_send = 0x00; + for (size_t c = 0; c < len; c++) { + for (int i = (c==0?4:7); i >= 0; i--) { + uint8_t cmd_bits = ((cmd[c] >> i) & 0x01) ? 0xff : 0x00; + for (int j = 0; j < (slow?4:1); ) { + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { + bits_to_send = bits_to_shift << (8 - shift_delay) | cmd_bits >> shift_delay; + AT91C_BASE_SSC->SSC_THR = bits_to_send; + bits_to_shift = cmd_bits; + j++; + } + } } - if(corr > max) { - max = corr; - maxPos = i; + WDT_HIT(); + } + // send the remaining bits, padded with 0: + bits_to_send = bits_to_shift << (8 - shift_delay); + for ( ; ; ) { + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { + AT91C_BASE_SSC->SSC_THR = bits_to_send; + break; } } - if (DEBUG) Dbprintf("SOF at %d, correlation %d", maxPos, max/(arraylen(FrameSOF)/skip)); - - int k = 0; // this will be our return value + LED_C_OFF(); +} - // greg - If correlation is less than 1 then there's little point in continuing - if ((max/(arraylen(FrameSOF)/skip)) >= 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)]; +//============================================================================= +// 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, +// i.e. function is called every 4,72us +// LED handling: +// LED C -> ON once we have received the SOF and are expecting the rest. +// LED C -> OFF once we have received EOF or are unsynced +// +// Returns: true if we received a EOF +// false if we are still waiting for some more +//============================================================================= + +#define NOISE_THRESHOLD 160 // don't try to correlate noise + +typedef struct DecodeTag { + enum { + 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; + enum { + LOGIC0, + LOGIC1, + SOF_PART1, + SOF_PART2 + } lastBit; + uint16_t shiftReg; + uint16_t max_len; + uint8_t *output; + int len; + int sum1, sum2; +} DecodeTag_t; + + +static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag) +{ + 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 { + if (DecodeTag->posCount > 10) { + DecodeTag->posCount = 1; + DecodeTag->sum1 = 0; + DecodeTag->state = STATE_TAG_SOF_HIGH; + } else { + DecodeTag->posCount = 0; + } } - 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_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; } - for(j = 0; j < arraylen(Logic1); j += skip) { - corr1 += Logic1[j]*dest[i+(j/skip)]; + break; + + 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(); + } } - for(j = 0; j < arraylen(FrameEOF); j += skip) { - corrEOF += FrameEOF[j]*dest[i+(j/skip)]; + break; + + case STATE_TAG_RECEIVING_DATA: + if (DecodeTag->posCount == 1) { + DecodeTag->sum1 = 0; + DecodeTag->sum2 = 0; } - // 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; + if (DecodeTag->posCount <= 4) { + DecodeTag->sum1 += amplitude; } else { - i += arraylen(Logic0)/skip; + DecodeTag->sum2 += amplitude; } - mask <<= 1; - if(mask == 0) { - k++; - mask = 0x01; + 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) { + 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 (DecodeTag->lastBit == SOF_PART1) { // still part of SOF + DecodeTag->lastBit = SOF_PART2; // SOF completed + } else { + 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 (DecodeTag->lastBit == SOF_PART1) { // incomplete SOF + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } else { + 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; + } + } + } + DecodeTag->posCount = 0; } - if((i+(int)arraylen(FrameEOF)/skip) >= 4000) { - DbpString("ran off end!"); - break; + DecodeTag->posCount++; + break; + + case STATE_TAG_EOF: + if (DecodeTag->posCount == 1) { + DecodeTag->sum1 = 0; + DecodeTag->sum2 = 0; } - } - if(mask != 0x01) { // this happens, when we miss the EOF - // TODO: for some reason this happens quite often - if (DEBUG) Dbprintf("error, uneven octet! (extra bits!) mask=%02x", mask); - if (mask<0x08) k--; // discard the last uneven octet; - // 0x08 is an assumption - but works quite often - } - // 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]; - } - } // "end if correlation > 0" (max/(arraylen(FrameSOF)/skip)) - return k; // return the number of bytes demodulated + if (DecodeTag->posCount <= 4) { + DecodeTag->sum1 += amplitude; + } else { + 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; -/// DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2)); + } + return false; } -// Now the GetISO15693 message from sniffing command -static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) +static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_len) { - int c = 0; - uint8_t *dest = BigBuf_get_addr(); + 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; +} + + +/* + * Receive and decode the tag response, also log to tracebuffer + */ +static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int timeout) +{ + int samples = 0; + bool gotFrame = false; + + uint16_t *dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); + + // 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 | FPGA_HF_READER_SUBCARRIER_424_KHZ | FPGA_HF_READER_MODE_RECEIVE_AMPLITUDE); + + // Setup and start DMA. + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + uint16_t *upTo = dmaBuf; -// NOW READ RESPONSE - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - //spindelay(60); // greg - experiment to get rid of some of the 0 byte/failed reads - c = 0; for(;;) { - 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 = iq >> 8; - int8_t q = iq; - uint8_t r = AMPLITUDE(i, q); + uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); - dest[c++] = r; + if (behindBy == 0) continue; - if(c >= BIGBUF_SIZE) { + uint16_t tagdata = *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; } } - } - - ////////////////////////////////////////// - /////////// DEMODULATE /////////////////// - ////////////////////////////////////////// - - int i, j; - int max = 0, maxPos=0; + 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 + } - int skip = 2; + samples++; - // 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 (Handle15693SamplesFromTag(tagdata, &DecodeTag)) { + gotFrame = true; + break; } - if(corr > max) { - max = corr; - maxPos = i; + + if (samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) { + DecodeTag.len = 0; + break; } + } - if (DEBUG) Dbprintf("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip)); - int k = 0; // this will be our return value + FpgaDisableSscDma(); + BigBuf_free(); - // 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)]; + 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 (DecodeTag.len > 0) { + LogTrace(DecodeTag.output, DecodeTag.len, 0, 0, NULL, false); + } + + return DecodeTag.len; +} + + +//============================================================================= +// 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 +//============================================================================= + +typedef struct DecodeReader { + enum { + STATE_READER_UNSYNCD, + STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF, + 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; +} + + +static void DecodeReaderReset(DecodeReader_t* DecodeReader) +{ + DecodeReader->state = STATE_READER_UNSYNCD; +} + + +static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uint8_t bit, DecodeReader_t *restrict DecodeReader) +{ + switch (DecodeReader->state) { + case STATE_READER_UNSYNCD: + // wait for unmodulated carrier + if (bit) { + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; } - 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_1ST_FALLING_EDGE_OF_SOF: + 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; } - for(j = 0; j < arraylen(Logic1); j += skip) { - corr1 += Logic1[j]*dest[i+(j/skip)]; + break; + + 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) + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; + } 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 + } } - for(j = 0; j < arraylen(FrameEOF); j += skip) { - corrEOF += FrameEOF[j]*dest[i+(j/skip)]; + break; + + 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 256 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 + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; + } else { + // do nothing, keep waiting + } } - // 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_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) + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; + } 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) + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; + } else { + DecodeReader->posCount = 1; + 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 + } + } + } + break; + + case STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4: + DecodeReader->posCount++; + if (bit) { + if (DecodeReader->posCount == 9) { + 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); + } + break; + + case STATE_READER_RECEIVE_DATA_1_OUT_OF_4: + bit = !!bit; + 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; + if (DecodeReader->sum1 <= 1 && DecodeReader->sum2 >= 3) { // EOF + LED_B_OFF(); // Finished receiving + DecodeReaderReset(DecodeReader); + if (DecodeReader->byteCount != 0) { + return true; + } + } + if (DecodeReader->sum1 >= 3 && DecodeReader->sum2 <= 1) { // 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++; + } + } + break; + + case STATE_READER_RECEIVE_DATA_1_OUT_OF_256: + bit = !!bit; + 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; + } + if (DecodeReader->posCount == 8) { + DecodeReader->posCount = 0; + if (DecodeReader->sum1 <= 1 && DecodeReader->sum2 >= 3) { // EOF + LED_B_OFF(); // Finished receiving + DecodeReaderReset(DecodeReader); + if (DecodeReader->byteCount != 0) { + return true; + } + } + if (DecodeReader->sum1 >= 3 && DecodeReader->sum2 <= 1) { // 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 len) or someone presses the pushbutton on the board (returns -1). +// +// Assume that we're called with the SSC (to the FPGA) and ADC path set +// correctly. +//----------------------------------------------------------------------------- + +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[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 dma_start_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 = dma_start_time + samples - DELAY_READER_TO_ARM_SIM; // 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 = -1; + 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(); + + 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) { + uint32_t sof_time = *eof_time + - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128:2048) // time for byte transfers + - 32 // time for SOF transfer + - 16; // time for EOF transfer + LogTrace(DecodeReader.output, DecodeReader.byteCount, sof_time, *eof_time, 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 = Iso15693Crc(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 @@ -549,156 +1043,200 @@ static void BuildIdentifyRequest(void); //----------------------------------------------------------------------------- void AcquireRawAdcSamplesIso15693(void) { - uint8_t *dest = BigBuf_get_addr(); + LEDsoff(); + LED_A_ON(); - int c = 0; + uint8_t *dest = BigBuf_get_addr(); FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - BuildIdentifyRequest(); - + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + BuildIdentifyRequest(); + // Give the tags time to energize - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + LED_D_ON(); SpinDelay(100); // Now send the command - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); + TransmitTo15693Tag(ToSend, ToSendMax, 0); - c = 0; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = ~ToSend[c]; - c++; - if(c == ToSendMax+3) { - break; - } - } - WDT_HIT(); - } + // wait for last transfer to complete + 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 | FPGA_HF_READER_SUBCARRIER_424_KHZ | FPGA_HF_READER_MODE_RECEIVE_AMPLITUDE); - c = 0; - for(;;) { + 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 = iq >> 8; - int8_t q = iq; - uint8_t r = AMPLITUDE(i, q); - - dest[c++] = r; - - if(c >= 4000) { - break; - } + uint16_t r = AT91C_BASE_SSC->SSC_RHR; + dest[c++] = r >> 5; } } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); } -void RecordRawAdcSamplesIso15693(void) +void SnoopIso15693(void) { - uint8_t *dest = BigBuf_get_addr(); + LED_A_ON(); + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + BigBuf_free(); - int c = 0; + clear_trace(); + set_tracing(true); - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - // Setup SSC - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + // 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; - // Start from off (no field generated) - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); + // 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 PM3 Button to stop."); + + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - SpinDelay(100); + // Setup for the DMA. + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + bool TagIsActive = false; + bool ReaderIsActive = false; + bool ExpectTagAnswer = false; - c = 0; + // And now we loop, receiving samples. for(;;) { - 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 = iq >> 8; - int8_t q = iq; - uint8_t r = AMPLITUDE(i, q); + uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); - dest[c++] = r; + if (behindBy == 0) continue; - if(c >= 14000) { + uint16_t snoopdata = *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, 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); + } + } - Dbprintf("finished recording"); + + 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 -// (this might produces glitches that confuse some tags -void Iso15693InitReader() { - LED_A_ON(); - LED_B_ON(); - LED_C_OFF(); - LED_D_OFF(); - +// Initialize the proxmark as iso15k reader +static void Iso15693InitReader() { FpgaDownloadAndGo(FPGA_BITSTREAM_HF); // Setup SSC // FpgaSetupSsc(); // Start from off (no field generated) + LED_D_OFF(); FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); SpinDelay(10); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); // Give the tags time to energize - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + LED_D_ON(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); SpinDelay(250); - - LED_A_ON(); - LED_B_OFF(); - LED_C_OFF(); - LED_D_OFF(); } /////////////////////////////////////////////////////////////////////// // ISO 15693 Part 3 - Air Interface -// This section basicly contains transmission and receiving of bits +// 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 ) @@ -706,12 +1244,11 @@ 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]; @@ -723,25 +1260,24 @@ 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 = Iso15693Crc(cmd, 11); // the crc needs to be calculated over 11 bytes cmd[11] = crc & 0xff; cmd[12] = crc >> 8; CodeIso15693AsReader(cmd, sizeof(cmd)); } + // 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; @@ -753,36 +1289,27 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) cmd[8] = uid[1]; //0x05; cmd[9] = uid[0]; //0xe0; //Now the CRC - crc = Crc(cmd, 10); + crc = Iso15693Crc(cmd, 10); 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[] -// return: lenght of received data -int SendDataTag(uint8_t *send, int sendlen, int init, int speed, uint8_t **recv) { +// init ... should we initialize the reader? +// 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, uint16_t max_recv_len, uint32_t start_time) { - int samples = 0; - int tsamples = 0; - int wait = 0; - int elapsed = 0; - LED_A_ON(); - LED_B_ON(); + LED_B_OFF(); LED_C_OFF(); - LED_D_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) @@ -791,30 +1318,22 @@ int SendDataTag(uint8_t *send, int sendlen, int init, int speed, uint8_t **recv) // high speed (1 out of 4) CodeIso15693AsReader(send, sendlen); } - - LED_A_ON(); - LED_B_OFF(); - - TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait); + + TransmitTo15693Tag(ToSend, ToSendMax, start_time); + // Now wait for a response - if (recv!=NULL) { - LED_A_OFF(); - LED_B_ON(); - answerLen = GetIso15693AnswerFromTag(answer, 100, &samples, &elapsed) ; - *recv=answer; + if (recv != NULL) { + answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, DELAY_ISO15693_VCD_TO_VICC_READER * 2); } LED_A_OFF(); - LED_B_OFF(); - LED_C_OFF(); - LED_D_OFF(); - + return answerLen; } // -------------------------------------------------------------------- -// Debug Functions +// Debug Functions // -------------------------------------------------------------------- // Decodes a message from a tag and displays its metadata and content @@ -823,53 +1342,53 @@ 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]) ) + + crc=Iso15693Crc(d,len-2); + 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); } @@ -888,83 +1407,69 @@ void SetDebugIso15693(uint32_t debug) { } - -//----------------------------------------------------------------------------- -// Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector +//--------------------------------------------------------------------------------------- +// Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector. // all demodulation performed in arm rather than host. - greg -//----------------------------------------------------------------------------- +//--------------------------------------------------------------------------------------- void ReaderIso15693(uint32_t parameter) { + LEDsoff(); LED_A_ON(); - LED_B_ON(); - LED_C_OFF(); - LED_D_OFF(); - int answerLen1 = 0; - int answerLen2 = 0; - // int answerLen3 = 0; - int i = 0; - int samples = 0; - int tsamples = 0; - int wait = 0; - int elapsed = 0; + set_tracing(true); + + int answerLen = 0; uint8_t TagUID[8] = {0x00}; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - uint8_t *answer1 = BigBuf_get_addr() + 4000; - uint8_t *answer2 = BigBuf_get_addr() + 4100; - // uint8_t *answer3 = BigBuf_get_addr() + 4200; - // Blank arrays - memset(answer1, 0x00, 200); + uint8_t answer[ISO15693_MAX_RESPONSE_LENGTH]; SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Setup SSC - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); // Start from off (no field generated) - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + SpinDelay(200); // Give the tags time to energize - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + LED_D_ON(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); SpinDelay(200); + StartCountSspClk(); - LED_A_ON(); - LED_B_OFF(); - LED_C_OFF(); - LED_D_OFF(); // 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,&tsamples, &wait); - + TransmitTo15693Tag(ToSend, ToSendMax, 0); + // Now wait for a response - answerLen1 = GetIso15693AnswerFromTag(answer1, 100, &samples, &elapsed) ; + answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC_READER * 2) ; + uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; - 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]); @@ -979,161 +1484,235 @@ void ReaderIso15693(uint32_t parameter) // Dbhexdump(answerLen3,answer3,true); // read all pages - if (answerLen1>=12 && DEBUG) { - i=0; - while (i<32) { // sanity check, assume max 32 pages - BuildReadBlockRequest(TagUID,i); - TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait); - answerLen2 = GetIso15693AnswerFromTag(answer2, 100, &samples, &elapsed); - 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 - } - i++; - } + if (answerLen >= 12 && DEBUG) { + for (int i = 0; i < 32; i++) { // 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_READER * 2); + start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; + 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 + } + } } - LED_A_OFF(); - LED_B_OFF(); - LED_C_OFF(); + // 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(); - LED_B_ON(); - LED_C_OFF(); - LED_D_OFF(); - - int answerLen1 = 0; - int samples = 0; - int tsamples = 0; - int wait = 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(); - LED_A_OFF(); - LED_B_OFF(); - LED_C_ON(); - LED_D_OFF(); + uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; + + // Build a suitable response to the reader INVENTORY command + BuildInventoryResponse(uid); // Listen to reader - answerLen1 = GetIso15693AnswerFromSniff(buf, 100, &samples, &elapsed) ; + 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_SIM - DELAY_ARM_TO_READER_SIM; + TransmitTo15693Reader(ToSend, ToSendMax, &start_time, 0, slow); + } - 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, &tsamples, &wait); + Dbprintf("%d bytes read from reader:", cmd_len); + Dbhexdump(cmd_len, cmd, false); } - 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]); - - 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]); - - LED_A_OFF(); - LED_B_OFF(); - LED_C_OFF(); - LED_D_OFF(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); } // 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) -{ - uint8_t data[20]; - uint8_t *recv=data; +void BruteforceIso15693Afi(uint32_t speed) +{ + LEDsoff(); + LED_A_ON(); + + uint8_t data[6]; + uint8_t recv[ISO15693_MAX_RESPONSE_LENGTH]; + 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,0,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 = Iso15693AddCrc(data,3); + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), 0); + uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; WDT_HIT(); if (recvlen>=12) { - Dbprintf("NoAFI UID=%s",sprintUID(NULL,&recv[2])); + Dbprintf("NoAFI UID=%s", Iso15693sprintUID(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,0,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 = Iso15693AddCrc(data,4); + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time); + start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; WDT_HIT(); - if (recvlen>=12) { - Dbprintf("AFI=%i UID=%s",i,sprintUID(NULL,&recv[2])); + if (recvlen >= 12) { + Dbprintf("AFI=%i UID=%s", i, Iso15693sprintUID(NULL, &recv[2])); } - } + } Dbprintf("AFI Bruteforcing done."); - + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); } // 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[]) { +void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint8_t data[]) { + + int recvlen = 0; + uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; + + LED_A_ON(); - int recvlen=0; - uint8_t *recvbuf = BigBuf_get_addr(); -// UsbCommand n; - if (DEBUG) { - Dbprintf("SEND"); - Dbhexdump(datalen,data,true); + Dbprintf("SEND:"); + Dbhexdump(datalen, data, false); } - - recvlen=SendDataTag(data,datalen,1,speed,(recv?&recvbuf:NULL)); - if (recv) { - LED_B_ON(); - cmd_send(CMD_ACK,recvlen>48?48:recvlen,0,0,recvbuf,48); - LED_B_OFF(); - + 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 + // 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(); } +//----------------------------------------------------------------------------- +// Work with "magic Chinese" card. +// +//----------------------------------------------------------------------------- + +// Set the UID to the tag (based on Iceman work). +void SetTag15693Uid(uint8_t *uid) +{ + uint8_t cmd[4][9] = {0x00}; + + uint16_t crc; + + int recvlen = 0; + uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; + + LED_A_ON(); + + // Command 1 : 02213E00000000 + cmd[0][0] = 0x02; + cmd[0][1] = 0x21; + cmd[0][2] = 0x3e; + cmd[0][3] = 0x00; + cmd[0][4] = 0x00; + cmd[0][5] = 0x00; + cmd[0][6] = 0x00; + + // Command 2 : 02213F69960000 + cmd[1][0] = 0x02; + cmd[1][1] = 0x21; + cmd[1][2] = 0x3f; + cmd[1][3] = 0x69; + cmd[1][4] = 0x96; + cmd[1][5] = 0x00; + cmd[1][6] = 0x00; + + // Command 3 : 022138u8u7u6u5 (where uX = uid byte X) + cmd[2][0] = 0x02; + cmd[2][1] = 0x21; + cmd[2][2] = 0x38; + cmd[2][3] = uid[7]; + cmd[2][4] = uid[6]; + cmd[2][5] = uid[5]; + cmd[2][6] = uid[4]; + + // Command 4 : 022139u4u3u2u1 (where uX = uid byte X) + cmd[3][0] = 0x02; + cmd[3][1] = 0x21; + cmd[3][2] = 0x39; + cmd[3][3] = uid[3]; + cmd[3][4] = uid[2]; + cmd[3][5] = uid[1]; + cmd[3][6] = uid[0]; + + for (int i=0; i<4; i++) { + // Add the CRC + crc = Iso15693Crc(cmd[i], 7); + cmd[i][7] = crc & 0xff; + cmd[i][8] = crc >> 8; + + if (DEBUG) { + Dbprintf("SEND:"); + Dbhexdump(sizeof(cmd[i]), cmd[i], false); + } + + recvlen = SendDataTag(cmd[i], sizeof(cmd[i]), true, 1, recvbuf, sizeof(recvbuf), 0); + + if (DEBUG) { + 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); + } + + LED_D_OFF(); + + LED_A_OFF(); +} @@ -1149,8 +1728,8 @@ static void __attribute__((unused)) BuildSysInfoRequest(uint8_t *uid) uint8_t cmd[12]; 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 + // 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 // one sub-carrier, inventory, 1 slot, fast rate cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit // System Information command code @@ -1166,7 +1745,7 @@ static void __attribute__((unused)) BuildSysInfoRequest(uint8_t *uid) cmd[8] = 0x05; cmd[9]= 0xe0; // always e0 (not exactly unique) //Now the CRC - crc = Crc(cmd, 10); // the crc needs to be calculated over 2 bytes + crc = Iso15693Crc(cmd, 10); // the crc needs to be calculated over 2 bytes cmd[10] = crc & 0xff; cmd[11] = crc >> 8; @@ -1180,8 +1759,8 @@ static void __attribute__((unused)) BuildReadMultiBlockRequest(uint8_t *uid) uint8_t cmd[14]; 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 + // 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 // one sub-carrier, inventory, 1 slot, fast rate cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit // READ Multi BLOCK command code @@ -1201,7 +1780,7 @@ static void __attribute__((unused)) BuildReadMultiBlockRequest(uint8_t *uid) // Number of Blocks to read cmd[11] = 0x2f; // read quite a few //Now the CRC - crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes + crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes cmd[12] = crc & 0xff; cmd[13] = crc >> 8; @@ -1214,8 +1793,8 @@ static void __attribute__((unused)) BuildArbitraryRequest(uint8_t *uid,uint8_t C uint8_t cmd[14]; 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 + // 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 // one sub-carrier, inventory, 1 slot, fast rate cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit // READ BLOCK command code @@ -1234,9 +1813,9 @@ static void __attribute__((unused)) BuildArbitraryRequest(uint8_t *uid,uint8_t C cmd[10] = 0x00; cmd[11] = 0x0a; -// cmd[12] = 0x00; -// cmd[13] = 0x00; //Now the CRC - crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes +// cmd[12] = 0x00; +// cmd[13] = 0x00; //Now the CRC + crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes cmd[12] = crc & 0xff; cmd[13] = crc >> 8; @@ -1249,8 +1828,8 @@ static void __attribute__((unused)) BuildArbitraryCustomRequest(uint8_t uid[], u uint8_t cmd[14]; 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 + // 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 // one sub-carrier, inventory, 1 slot, fast rate cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit // READ BLOCK command code @@ -1266,12 +1845,12 @@ static void __attribute__((unused)) BuildArbitraryCustomRequest(uint8_t uid[], u cmd[8] = 0x05; cmd[9]= 0xe0; // always e0 (not exactly unique) // Parameter - cmd[10] = 0x05; // for custom codes this must be manufcturer code + cmd[10] = 0x05; // for custom codes this must be manufacturer code cmd[11] = 0x00; -// cmd[12] = 0x00; -// cmd[13] = 0x00; //Now the CRC - crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes +// cmd[12] = 0x00; +// cmd[13] = 0x00; //Now the CRC + crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes cmd[12] = crc & 0xff; cmd[13] = crc >> 8;