X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/096dee178438c0a722eaf112c8b63ad4eaa9064a..refs/pull/938/head:/armsrc/iso15693.c?ds=inline diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c index f4120512..f16698bb 100644 --- a/armsrc/iso15693.c +++ b/armsrc/iso15693.c @@ -2,7 +2,7 @@ // 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 +// 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 @@ -16,26 +16,26 @@ // 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. +// 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 //----------------------------------------------------------------------------- @@ -58,36 +58,51 @@ #include "string.h" #include "iso15693tools.h" #include "protocols.h" -#include "cmd.h" +#include "usb_cdc.h" #include "BigBuf.h" #include "fpgaloader.h" #define arraylen(x) (sizeof(x)/sizeof((x)[0])) +// Delays in SSP_CLK ticks. +// SSP_CLK runs at 13,56MHz / 32 = 423.75kHz when simulating a tag +#define DELAY_READER_TO_ARM 8 +#define DELAY_ARM_TO_READER 0 +//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when acting as reader. All values should be multiples of 16 +#define DELAY_ARM_TO_TAG 16 +#define DELAY_TAG_TO_ARM 32 +//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when snooping. All values should be multiples of 16 +#define DELAY_TAG_TO_ARM_SNOOP 32 +#define DELAY_READER_TO_ARM_SNOOP 32 + +// times in samples @ 212kHz when acting as reader +//#define ISO15693_READER_TIMEOUT 80 // 80/212kHz = 378us, nominal t1_max=313,9us +#define ISO15693_READER_TIMEOUT 330 // 330/212kHz = 1558us, should be even enough for iClass tags responding to ACTALL +#define ISO15693_READER_TIMEOUT_WRITE 4700 // 4700/212kHz = 22ms, nominal 20ms + + 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 Crc(data,datalen) Iso15693Crc(data,datalen) -#define AddCrc(data,datalen) Iso15693AddCrc(data,datalen) -#define sprintUID(target,uid) Iso15693sprintUID(target,uid) - // buffers -#define ISO15693_DMA_BUFFER_SIZE 2048 // must be a power of 2 +#define ISO15693_DMA_BUFFER_SIZE 256 // 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 -// timing. Delays in SSP_CLK ticks. -// SSP_CLK runs at 13,56MHz / 32 = 423.75kHz when simulating a tag -#define DELAY_READER_TO_ARM_SIM 8 -#define DELAY_ARM_TO_READER_SIM 1 -#define DELAY_ISO15693_VCD_TO_VICC_SIM 132 // 132/423.75kHz = 311.5us from end of command EOF to start of tag response -//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when acting as reader -#define DELAY_ISO15693_VCD_TO_VICC_READER 1056 // 1056/3,39MHz = 311.5us from end of command EOF to start of tag response -#define DELAY_ISO15693_VICC_TO_VCD_READER 1017 // 1017/3.39MHz = 300us between end of tag response and next reader command + +// specific LogTrace function for ISO15693: the duration needs to be scaled because otherwise it won't fit into a uint16_t +bool LogTrace_ISO15693(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag) { + uint32_t duration = timestamp_end - timestamp_start; + duration /= 32; + timestamp_end = timestamp_start + duration; + return LogTrace(btBytes, iLen, timestamp_start, timestamp_end, parity, readerToTag); +} + // --------------------------- // Signal Processing @@ -97,191 +112,181 @@ static int DEBUG = 0; // resulting data rate is 26.48 kbit/s (fc/512) // cmd ... data // n ... length of data -static void CodeIso15693AsReader(uint8_t *cmd, int n) -{ - int i, j; +void CodeIso15693AsReader(uint8_t *cmd, int n) { ToSendReset(); - // Give it a bit of slack at the beginning - for(i = 0; i < 24; i++) { - ToSendStuffBit(1); - } - // SOF for 1of4 - ToSendStuffBit(0); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(1); - ToSendStuffBit(1); - for(i = 0; i < n; i++) { - for(j = 0; j < 8; j += 2) { - int these = (cmd[i] >> j) & 3; + ToSend[++ToSendMax] = 0x84; //10000100 + + // data + for (int i = 0; i < n; i++) { + for (int j = 0; j < 8; j += 2) { + int these = (cmd[i] >> j) & 0x03; switch(these) { case 0: - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); + ToSend[++ToSendMax] = 0x40; //01000000 break; case 1: - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); + ToSend[++ToSendMax] = 0x10; //00010000 break; case 2: - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(1); - ToSendStuffBit(1); + ToSend[++ToSendMax] = 0x04; //00000100 break; case 3: - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); + ToSend[++ToSendMax] = 0x01; //00000001 break; } } } + // EOF - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(1); - - // Fill remainder of last byte with 1 - for(i = 0; i < 4; i++) { - ToSendStuffBit(1); - } - + ToSend[++ToSendMax] = 0x20; //0010 + 0000 padding + + ToSendMax++; +} + + +// Encode EOF only +static void CodeIso15693AsReaderEOF() { + ToSendReset(); + ToSend[++ToSendMax] = 0x20; ToSendMax++; } + // 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) { - int i, j; - ToSendReset(); - // Give it a bit of slack at the beginning - for(i = 0; i < 24; i++) { - ToSendStuffBit(1); - } - // SOF for 1of256 - ToSendStuffBit(0); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); - - for(i = 0; i < n; i++) { - for (j = 0; j<=255; j++) { - if (cmd[i]==j) { - ToSendStuffBit(1); + ToSend[++ToSendMax] = 0x81; //10000001 + + // data + for(int i = 0; i < n; i++) { + for (int j = 0; j <= 255; j++) { + if (cmd[i] == j) { ToSendStuffBit(0); - } else { - ToSendStuffBit(1); ToSendStuffBit(1); + } else { + ToSendStuffBit(0); + ToSendStuffBit(0); } } } + // EOF - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(1); - - // Fill remainder of last byte with 1 - for(i = 0; i < 4; i++) { - ToSendStuffBit(1); - } + ToSend[++ToSendMax] = 0x20; //0010 + 0000 padding ToSendMax++; } -static void CodeIso15693AsTag(uint8_t *cmd, int n) -{ +// 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 - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(1); + ToSend[++ToSendMax] = 0x1D; // 00011101 // 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); - } - } + for (int i = 0; i < len; i++) { + ToSend[++ToSendMax] = encode_4bits[cmd[i] & 0xF]; + ToSend[++ToSendMax] = encode_4bits[cmd[i] >> 4]; } // EOF - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(1); - ToSendStuffBit(0); - ToSendStuffBit(0); - ToSendStuffBit(0); + ToSend[++ToSendMax] = 0xB8; // 10111000 ToSendMax++; } // Transmit the command (to the tag) that was placed in cmd[]. -static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time) -{ +void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t *start_time) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_FULL_MOD); - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); - while (GetCountSspClk() < start_time) ; + if (*start_time < DELAY_ARM_TO_TAG) { + *start_time = DELAY_ARM_TO_TAG; + } + + *start_time = (*start_time - DELAY_ARM_TO_TAG) & 0xfffffff0; + + if (GetCountSspClk() > *start_time) { // we may miss the intended time + *start_time = (GetCountSspClk() + 16) & 0xfffffff0; // next possible time + } + + while (GetCountSspClk() < *start_time) + /* wait */ ; LED_B_ON(); - for(int c = 0; c < len; c++) { + 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; + uint16_t send_word = (data & 0x80) ? 0xffff : 0x0000; 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))) ; @@ -291,46 +296,60 @@ static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time) WDT_HIT(); } LED_B_OFF(); + + *start_time = *start_time + DELAY_ARM_TO_TAG; } //----------------------------------------------------------------------------- // Transmit the tag response (to the reader) that was placed in cmd[]. //----------------------------------------------------------------------------- -static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, bool slow) -{ +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); - uint8_t shift_delay = start_time & 0x00000007; - uint8_t bitmask = 0x00; - for (int i = 0; i < shift_delay; i++) { - bitmask |= (0x01 << i); + uint32_t modulation_start_time = *start_time - DELAY_ARM_TO_READER + 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 + } } - while (GetCountSspClk() < (start_time & 0xfffffff8)) ; + while (GetCountSspClk() < (modulation_start_time & 0xfffffff8)) + /* wait */ ; + + uint8_t shift_delay = modulation_start_time & 0x00000007; - AT91C_BASE_SSC->SSC_THR = 0x00; // clear TXRDY + *start_time = modulation_start_time + DELAY_ARM_TO_READER - 3 * 8; LED_C_ON(); 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--) { + 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) { - if (bits_to_send >> i & 0x01) { - AT91C_BASE_SSC->SSC_THR = 0xff; - } else { - AT91C_BASE_SSC->SSC_THR = 0x00; - } + 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++; } - WDT_HIT(); } - } - } + } + 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; + } + } LED_C_OFF(); } @@ -349,15 +368,18 @@ static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start // false if we are still waiting for some more //============================================================================= -#define NOISE_THRESHOLD 160 // don't try to correlate noise +#define NOISE_THRESHOLD 80 // don't try to correlate noise +#define MAX_PREVIOUS_AMPLITUDE (-1 - NOISE_THRESHOLD) typedef struct DecodeTag { enum { STATE_TAG_SOF_LOW, + STATE_TAG_SOF_RISING_EDGE, STATE_TAG_SOF_HIGH, STATE_TAG_SOF_HIGH_END, STATE_TAG_RECEIVING_DATA, - STATE_TAG_EOF + STATE_TAG_EOF, + STATE_TAG_EOF_TAIL } state; int bitCount; int posCount; @@ -372,47 +394,67 @@ typedef struct DecodeTag { uint8_t *output; int len; int sum1, sum2; + int threshold_sof; + int threshold_half; + uint16_t previous_amplitude; } 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 { +static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag) { + switch (DecodeTag->state) { + case STATE_TAG_SOF_LOW: + // waiting for a rising edge + if (amplitude > NOISE_THRESHOLD + DecodeTag->previous_amplitude) { if (DecodeTag->posCount > 10) { - DecodeTag->posCount = 1; - DecodeTag->sum1 = 0; - DecodeTag->state = STATE_TAG_SOF_HIGH; + DecodeTag->threshold_sof = amplitude - DecodeTag->previous_amplitude; // to be divided by 2 + DecodeTag->threshold_half = 0; + DecodeTag->state = STATE_TAG_SOF_RISING_EDGE; } else { DecodeTag->posCount = 0; } + } else { + DecodeTag->posCount++; + DecodeTag->previous_amplitude = amplitude; + } + break; + + case STATE_TAG_SOF_RISING_EDGE: + if (amplitude > DecodeTag->threshold_sof + DecodeTag->previous_amplitude) { // edge still rising + if (amplitude > DecodeTag->threshold_sof + DecodeTag->threshold_sof) { // steeper edge, take this as time reference + DecodeTag->posCount = 1; + } else { + DecodeTag->posCount = 2; + } + DecodeTag->threshold_sof = (amplitude - DecodeTag->previous_amplitude) / 2; + } else { + DecodeTag->posCount = 2; + DecodeTag->threshold_sof = DecodeTag->threshold_sof/2; } + // DecodeTag->posCount = 2; + DecodeTag->state = STATE_TAG_SOF_HIGH; break; - + case STATE_TAG_SOF_HIGH: // waiting for 10 times high. Take average over the last 8 - if (amplitude > NOISE_THRESHOLD) { + if (amplitude > DecodeTag->threshold_sof) { DecodeTag->posCount++; if (DecodeTag->posCount > 2) { - DecodeTag->sum1 += amplitude; // keep track of average high value + DecodeTag->threshold_half += amplitude; // keep track of average high value } if (DecodeTag->posCount == 10) { - DecodeTag->sum1 >>= 4; // calculate half of average high value (8 samples) + DecodeTag->threshold_half >>= 2; // (4 times 1/2 average) DecodeTag->state = STATE_TAG_SOF_HIGH_END; } } else { // high phase was too short DecodeTag->posCount = 1; + DecodeTag->previous_amplitude = amplitude; DecodeTag->state = STATE_TAG_SOF_LOW; } 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 + // check for falling edge + if (DecodeTag->posCount == 13 && amplitude < DecodeTag->threshold_sof) { DecodeTag->lastBit = SOF_PART1; // detected 1st part of SOF (12 samples low and 12 samples high) DecodeTag->shiftReg = 0; DecodeTag->bitCount = 0; @@ -421,11 +463,18 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1 DecodeTag->sum2 = 0; DecodeTag->posCount = 2; DecodeTag->state = STATE_TAG_RECEIVING_DATA; + // FpgaDisableTracing(); // DEBUGGING + // Dbprintf("amplitude = %d, threshold_sof = %d, threshold_half/4 = %d, previous_amplitude = %d", + // amplitude, + // DecodeTag->threshold_sof, + // DecodeTag->threshold_half/4, + // DecodeTag->previous_amplitude); // DEBUGGING LED_C_ON(); } else { DecodeTag->posCount++; if (DecodeTag->posCount > 13) { // high phase too long DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); } @@ -433,6 +482,12 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1 break; case STATE_TAG_RECEIVING_DATA: + // FpgaDisableTracing(); // DEBUGGING + // Dbprintf("amplitude = %d, threshold_sof = %d, threshold_half/4 = %d, previous_amplitude = %d", + // amplitude, + // DecodeTag->threshold_sof, + // DecodeTag->threshold_half/4, + // DecodeTag->previous_amplitude); // DEBUGGING if (DecodeTag->posCount == 1) { DecodeTag->sum1 = 0; DecodeTag->sum2 = 0; @@ -443,18 +498,16 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1 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_EOF > corr_1) { + if (DecodeTag->sum1 > DecodeTag->threshold_half && DecodeTag->sum2 > DecodeTag->threshold_half) { // modulation in both halves if (DecodeTag->lastBit == LOGIC0) { // this was already part of EOF DecodeTag->state = STATE_TAG_EOF; } else { DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); } - } else if (corr_1 > corr_0) { + } else if (DecodeTag->sum1 < DecodeTag->threshold_half && DecodeTag->sum2 > DecodeTag->threshold_half) { // modulation in second half // logic 1 if (DecodeTag->lastBit == SOF_PART1) { // still part of SOF DecodeTag->lastBit = SOF_PART2; // SOF completed @@ -466,20 +519,21 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1 if (DecodeTag->bitCount == 8) { DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; DecodeTag->len++; + // if (DecodeTag->shiftReg == 0x12 && DecodeTag->len == 1) FpgaDisableTracing(); // DEBUGGING if (DecodeTag->len > DecodeTag->max_len) { // buffer overflow, give up - DecodeTag->posCount = 0; - DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); + return true; } DecodeTag->bitCount = 0; DecodeTag->shiftReg = 0; } } - } else { + } else if (DecodeTag->sum1 > DecodeTag->threshold_half && DecodeTag->sum2 < DecodeTag->threshold_half) { // modulation in first half // logic 0 if (DecodeTag->lastBit == SOF_PART1) { // incomplete SOF DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); } else { @@ -489,9 +543,11 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1 if (DecodeTag->bitCount == 8) { DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; DecodeTag->len++; + // if (DecodeTag->shiftReg == 0x12 && DecodeTag->len == 1) FpgaDisableTracing(); // DEBUGGING if (DecodeTag->len > DecodeTag->max_len) { // buffer overflow, give up DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); } @@ -499,6 +555,15 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1 DecodeTag->shiftReg = 0; } } + } else { // no modulation + if (DecodeTag->lastBit == SOF_PART2) { // only SOF (this is OK for iClass) + LED_C_OFF(); + return true; + } else { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } } DecodeTag->posCount = 0; } @@ -516,29 +581,50 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1 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) { + if (DecodeTag->sum1 > DecodeTag->threshold_half && DecodeTag->sum2 < DecodeTag->threshold_half) { // modulation in first half + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_EOF_TAIL; + } else { DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); - } else { + } + } + DecodeTag->posCount++; + break; + + case STATE_TAG_EOF_TAIL: + if (DecodeTag->posCount == 1) { + DecodeTag->sum1 = 0; + DecodeTag->sum2 = 0; + } + if (DecodeTag->posCount <= 4) { + DecodeTag->sum1 += amplitude; + } else { + DecodeTag->sum2 += amplitude; + } + if (DecodeTag->posCount == 8) { + if (DecodeTag->sum1 < DecodeTag->threshold_half && DecodeTag->sum2 < DecodeTag->threshold_half) { // no modulation in both halves LED_C_OFF(); return true; + } else { + DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); } } DecodeTag->posCount++; break; - } return false; } -static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_len) -{ +static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_len) { + DecodeTag->previous_amplitude = MAX_PREVIOUS_AMPLITUDE; DecodeTag->posCount = 0; DecodeTag->state = STATE_TAG_SOF_LOW; DecodeTag->output = data; @@ -546,23 +632,23 @@ static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_le } -static void DecodeTagReset(DecodeTag_t *DecodeTag) -{ +static void DecodeTagReset(DecodeTag_t *DecodeTag) { DecodeTag->posCount = 0; DecodeTag->state = STATE_TAG_SOF_LOW; + DecodeTag->previous_amplitude = MAX_PREVIOUS_AMPLITUDE; } /* * Receive and decode the tag response, also log to tracebuffer */ -static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int timeout) -{ +int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, uint16_t timeout, uint32_t *eof_time) { + int samples = 0; - bool gotFrame = false; + int ret = 0; + + uint16_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; - 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); @@ -576,6 +662,7 @@ static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int tim // Setup and start DMA. FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + uint32_t dma_start_time = 0; uint16_t *upTo = dmaBuf; for(;;) { @@ -583,12 +670,19 @@ static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int tim if (behindBy == 0) continue; + samples++; + if (samples == 1) { + // DMA has transferred the very first data + dma_start_time = GetCountSspClk() & 0xfffffff0; + } + 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)) { + if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); + ret = -1; break; } } @@ -597,30 +691,42 @@ static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int tim AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers } - samples++; - if (Handle15693SamplesFromTag(tagdata, &DecodeTag)) { - gotFrame = true; + *eof_time = dma_start_time + samples*16 - DELAY_TAG_TO_ARM; // end of EOF + if (DecodeTag.lastBit == SOF_PART2) { + *eof_time -= 8*16; // needed 8 additional samples to confirm single SOF (iCLASS) + } + if (DecodeTag.len > DecodeTag.max_len) { + ret = -2; // buffer overflow + } break; } if (samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) { - DecodeTag.len = 0; + ret = -1; // timeout 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 (DecodeTag.len > 0) { - LogTrace(DecodeTag.output, DecodeTag.len, 0, 0, NULL, false); + if (DEBUG) Dbprintf("samples = %d, ret = %d, Decoder: state = %d, lastBit = %d, len = %d, bitCount = %d, posCount = %d", + samples, ret, DecodeTag.state, DecodeTag.lastBit, DecodeTag.len, DecodeTag.bitCount, DecodeTag.posCount); + + if (ret < 0) { + return ret; } + uint32_t sof_time = *eof_time + - DecodeTag.len * 8 * 8 * 16 // time for byte transfers + - 32 * 16 // time for SOF transfer + - (DecodeTag.lastBit != SOF_PART2?32*16:0); // time for EOF transfer + + if (DEBUG) Dbprintf("timing: sof_time = %d, eof_time = %d", sof_time, *eof_time); + + LogTrace_ISO15693(DecodeTag.output, DecodeTag.len, sof_time*4, *eof_time*4, NULL, false); + return DecodeTag.len; } @@ -641,12 +747,14 @@ static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int tim 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_READER_RECEIVE_DATA_1_OUT_OF_256, + STATE_READER_RECEIVE_JAMMING } state; enum { CODING_1_OUT_OF_4, @@ -657,13 +765,14 @@ typedef struct DecodeReader { int byteCount; int byteCountMax; int posCount; - int sum1, sum2; + int sum1, sum2; uint8_t *output; + uint8_t jam_search_len; + uint8_t *jam_search_string; } DecodeReader_t; -static void DecodeReaderInit(DecodeReader_t* DecodeReader, uint8_t *data, uint16_t max_len) -{ +static void DecodeReaderInit(DecodeReader_t* DecodeReader, uint8_t *data, uint16_t max_len, uint8_t jam_search_len, uint8_t *jam_search_string) { DecodeReader->output = data; DecodeReader->byteCountMax = max_len; DecodeReader->state = STATE_READER_UNSYNCD; @@ -671,20 +780,27 @@ static void DecodeReaderInit(DecodeReader_t* DecodeReader, uint8_t *data, uint16 DecodeReader->bitCount = 0; DecodeReader->posCount = 1; DecodeReader->shiftReg = 0; + DecodeReader->jam_search_len = jam_search_len; + DecodeReader->jam_search_string = jam_search_string; } -static void DecodeReaderReset(DecodeReader_t* DecodeReader) -{ +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) { +static int inline __attribute__((always_inline)) Handle15693SampleFromReader(bool bit, DecodeReader_t *DecodeReader) { + switch (DecodeReader->state) { case STATE_READER_UNSYNCD: - if(!bit) { + // wait for unmodulated carrier + if (bit) { + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; + } + 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; @@ -693,14 +809,14 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin 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); + 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 + if (DecodeReader->posCount > 5) { // stayed low for too long DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting @@ -710,7 +826,7 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin case STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF: DecodeReader->posCount++; - if(!bit) { // detected a falling edge + 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 @@ -718,13 +834,13 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin 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 + } 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 - DecodeReaderReset(DecodeReader); + if (DecodeReader->posCount > 29) { // stayed high for too long + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; } else { // do nothing, keep waiting } @@ -736,7 +852,7 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin 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); + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; } else { DecodeReader->posCount = 1; DecodeReader->bitCount = 0; @@ -747,21 +863,22 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin } } else { // CODING_1_OUT_OF_4 if (DecodeReader->posCount < 24) { // rising edge too early (nominally expected at 25) - DecodeReaderReset(DecodeReader); + 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); + 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); + DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting } @@ -772,7 +889,7 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin case STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4: DecodeReader->posCount++; if (bit) { - if (DecodeReader->posCount == 33) { + if (DecodeReader->posCount == 9) { DecodeReader->posCount = 1; DecodeReader->bitCount = 0; DecodeReader->byteCount = 0; @@ -790,27 +907,23 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin case STATE_READER_RECEIVE_DATA_1_OUT_OF_4: DecodeReader->posCount++; if (DecodeReader->posCount == 1) { - DecodeReader->sum1 = bit; + DecodeReader->sum1 = bit?1:0; } else if (DecodeReader->posCount <= 4) { - DecodeReader->sum1 += bit; + if (bit) DecodeReader->sum1++; } else if (DecodeReader->posCount == 5) { - DecodeReader->sum2 = bit; + DecodeReader->sum2 = bit?1:0; } else { - DecodeReader->sum2 += bit; + if (bit) DecodeReader->sum2++; } 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 + if (DecodeReader->sum1 <= 1 && DecodeReader->sum2 >= 3) { // EOF LED_B_OFF(); // Finished receiving DecodeReaderReset(DecodeReader); if (DecodeReader->byteCount != 0) { return true; } - } - if (corr10 > corr11) { // detected a 2bit position + } else if (DecodeReader->sum1 >= 3 && DecodeReader->sum2 <= 1) { // detected a 2bit position DecodeReader->shiftReg >>= 2; DecodeReader->shiftReg |= (DecodeReader->bitCount << 6); } @@ -823,6 +936,13 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin } DecodeReader->bitCount = 0; DecodeReader->shiftReg = 0; + if (DecodeReader->byteCount == DecodeReader->jam_search_len) { + if (!memcmp(DecodeReader->output, DecodeReader->jam_search_string, DecodeReader->jam_search_len)) { + LED_D_ON(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_JAM); + DecodeReader->state = STATE_READER_RECEIVE_JAMMING; + } + } } else { DecodeReader->bitCount++; } @@ -832,27 +952,23 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin case STATE_READER_RECEIVE_DATA_1_OUT_OF_256: DecodeReader->posCount++; if (DecodeReader->posCount == 1) { - DecodeReader->sum1 = bit; + DecodeReader->sum1 = bit?1:0; } else if (DecodeReader->posCount <= 4) { - DecodeReader->sum1 += bit; + if (bit) DecodeReader->sum1++; } else if (DecodeReader->posCount == 5) { - DecodeReader->sum2 = bit; - } else { - DecodeReader->sum2 += bit; + DecodeReader->sum2 = bit?1:0; + } else if (bit) { + DecodeReader->sum2++; } 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 + if (DecodeReader->sum1 <= 1 && DecodeReader->sum2 >= 3) { // EOF LED_B_OFF(); // Finished receiving DecodeReaderReset(DecodeReader); if (DecodeReader->byteCount != 0) { return true; } - } - if (corr10 > corr11) { // detected the bit position + } else if (DecodeReader->sum1 >= 3 && DecodeReader->sum2 <= 1) { // detected the bit position DecodeReader->shiftReg = DecodeReader->bitCount; } if (DecodeReader->bitCount == 255) { // we have a full byte @@ -862,11 +978,42 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin LED_B_OFF(); DecodeReaderReset(DecodeReader); } + if (DecodeReader->byteCount == DecodeReader->jam_search_len) { + if (!memcmp(DecodeReader->output, DecodeReader->jam_search_string, DecodeReader->jam_search_len)) { + LED_D_ON(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_JAM); + DecodeReader->state = STATE_READER_RECEIVE_JAMMING; + } + } } DecodeReader->bitCount++; } break; + case STATE_READER_RECEIVE_JAMMING: + DecodeReader->posCount++; + if (DecodeReader->Coding == CODING_1_OUT_OF_4) { + if (DecodeReader->posCount == 7*16) { // 7 bits jammed + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE); // stop jamming + // FpgaDisableTracing(); + LED_D_OFF(); + } else if (DecodeReader->posCount == 8*16) { + DecodeReader->posCount = 0; + DecodeReader->output[DecodeReader->byteCount++] = 0x00; + DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_4; + } + } else { + if (DecodeReader->posCount == 7*256) { // 7 bits jammend + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE); // stop jamming + LED_D_OFF(); + } else if (DecodeReader->posCount == 8*256) { + DecodeReader->posCount = 0; + DecodeReader->output[DecodeReader->byteCount++] = 0x00; + DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_256; + } + } + break; + default: LED_B_OFF(); DecodeReaderReset(DecodeReader); @@ -881,23 +1028,22 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin // 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). +// (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. //----------------------------------------------------------------------------- -static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time) -{ +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); + uint8_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; // the decoder data structure DecodeReader_t DecodeReader = {0}; - DecodeReaderInit(&DecodeReader, received, max_len); + DecodeReaderInit(&DecodeReader, received, max_len, 0, NULL); // wait for last transfer to complete while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); @@ -910,21 +1056,21 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 (void) temp; while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) ; - uint32_t bit_time = GetCountSspClk() & 0xfffffff8; + uint32_t dma_start_time = GetCountSspClk() & 0xfffffff8; // Setup and start DMA. FpgaSetupSscDma(dmaBuf, ISO15693_DMA_BUFFER_SIZE); uint8_t *upTo = dmaBuf; - for(;;) { + 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. + 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)) { + if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); break; } @@ -936,7 +1082,7 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 for (int i = 7; i >= 0; i--) { if (Handle15693SampleFromReader((b >> i) & 0x01, &DecodeReader)) { - *eof_time = bit_time + samples - DELAY_READER_TO_ARM_SIM; // end of EOF + *eof_time = dma_start_time + samples - DELAY_READER_TO_ARM; // end of EOF gotFrame = true; break; } @@ -948,48 +1094,44 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 } if (BUTTON_PRESS()) { - DecodeReader.byteCount = 0; + DecodeReader.byteCount = -1; break; } 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); + samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount); if (DecodeReader.byteCount > 0) { - LogTrace(DecodeReader.output, DecodeReader.byteCount, 0, *eof_time, NULL, true); + 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_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*32, *eof_time*32, NULL, true); } return DecodeReader.byteCount; } -// Encode (into the ToSend buffers) an identify request, which is the first +// Construct an identify (Inventory) 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]; - +static void BuildIdentifyRequest(uint8_t *cmd) { 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); + cmd[0] = ISO15693_REQ_INVENTORY | ISO15693_REQINV_SLOT1 | ISO15693_REQ_DATARATE_HIGH; // inventory command code cmd[1] = 0x01; // no mask cmd[2] = 0x00; //Now the CRC - crc = Crc(cmd, 3); + crc = Iso15693Crc(cmd, 3); cmd[3] = crc & 0xff; cmd[4] = crc >> 8; - - CodeIso15693AsReader(cmd, sizeof(cmd)); } @@ -998,26 +1140,27 @@ static void BuildIdentifyRequest(void) // for the response. The response is not demodulated, just left in the buffer // so that it can be downloaded to a PC and processed there. //----------------------------------------------------------------------------- -void AcquireRawAdcSamplesIso15693(void) -{ - LEDsoff(); +void AcquireRawAdcSamplesIso15693(void) { LED_A_ON(); uint8_t *dest = BigBuf_get_addr(); FpgaDownloadAndGo(FPGA_BITSTREAM_HF); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); + LED_D_ON(); FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - BuildIdentifyRequest(); + uint8_t cmd[5]; + BuildIdentifyRequest(cmd); + CodeIso15693AsReader(cmd, sizeof(cmd)); // Give the tags time to energize - LED_D_ON(); SpinDelay(100); // Now send the command - TransmitTo15693Tag(ToSend, ToSendMax, 0); + uint32_t start_time = 0; + TransmitTo15693Tag(ToSend, ToSendMax, &start_time); // wait for last transfer to complete while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)) ; @@ -1036,18 +1179,17 @@ void AcquireRawAdcSamplesIso15693(void) } -void SnoopIso15693(void) -{ +void SnoopIso15693(uint8_t jam_search_len, uint8_t *jam_search_string) { + 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; + uint16_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; // Count of samples received so far, so that we can include timing // information in the trace buffer. @@ -1057,9 +1199,9 @@ void SnoopIso15693(void) uint8_t response[ISO15693_MAX_RESPONSE_LENGTH]; DecodeTagInit(&DecodeTag, response, sizeof(response)); - DecodeReader_t DecodeReader = {0};; + DecodeReader_t DecodeReader = {0}; uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; - DecodeReaderInit(&DecodeReader, cmd, sizeof(cmd)); + DecodeReaderInit(&DecodeReader, cmd, sizeof(cmd), jam_search_len, jam_search_string); // Print some debug information about the buffer sizes if (DEBUG) { @@ -1070,30 +1212,43 @@ void SnoopIso15693(void) 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); + LED_D_OFF(); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - - // Setup for the DMA. FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); - upTo = dmaBuf; + StartCountSspClk(); FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); bool TagIsActive = false; bool ReaderIsActive = false; bool ExpectTagAnswer = false; + uint32_t dma_start_time = 0; + uint16_t *upTo = dmaBuf; + uint16_t max_behindBy = 0; + // And now we loop, receiving samples. for(;;) { uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); - + if (behindBy > max_behindBy) { + max_behindBy = behindBy; + } + if (behindBy == 0) continue; + samples++; + if (samples == 1) { + // DMA has transferred the very first data + dma_start_time = GetCountSspClk() & 0xfffffff0; + } + uint16_t snoopdata = *upTo++; - if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + 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)) { + if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + // FpgaDisableTracing(); Dbprintf("About to blow circular buffer - aborted! behindBy=%d, samples=%d", behindBy, samples); break; } @@ -1101,91 +1256,122 @@ void SnoopIso15693(void) 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()) { + if (BUTTON_PRESS()) { DbpString("Snoop stopped."); break; } } } - samples++; - - if (!TagIsActive) { // no need to try decoding reader data if the tag is sending + + 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); + // FpgaDisableSscDma(); + uint32_t eof_time = dma_start_time + samples*16 + 8 - DELAY_READER_TO_ARM_SNOOP; // end of EOF + if (DecodeReader.byteCount > 0) { + uint32_t sof_time = eof_time + - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128*16:2048*16) // time for byte transfers + - 32*16 // time for SOF transfer + - 16*16; // time for EOF transfer + LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*4, eof_time*4, 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(); + ReaderIsActive = false; ExpectTagAnswer = true; - LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); + // upTo = dmaBuf; + // samples = 0; + // FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + // continue; + } else if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) { + // FpgaDisableSscDma(); + uint32_t eof_time = dma_start_time + samples*16 + 16 - DELAY_READER_TO_ARM_SNOOP; // end of EOF + if (DecodeReader.byteCount > 0) { + uint32_t sof_time = eof_time + - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128*16:2048*16) // time for byte transfers + - 32*16 // time for SOF transfer + - 16*16; // time for EOF transfer + LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*4, eof_time*4, 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 = false; + ExpectTagAnswer = true; + // upTo = dmaBuf; + // samples = 0; + // FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + // continue; + } else { + ReaderIsActive = (DecodeReader.state >= STATE_READER_RECEIVE_DATA_1_OUT_OF_4); } - 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 (!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); + // FpgaDisableSscDma(); + uint32_t eof_time = dma_start_time + samples*16 - DELAY_TAG_TO_ARM_SNOOP; // end of EOF + if (DecodeTag.lastBit == SOF_PART2) { + eof_time -= 8*16; // needed 8 additional samples to confirm single SOF (iCLASS) + } + uint32_t sof_time = eof_time + - DecodeTag.len * 8 * 8 * 16 // time for byte transfers + - 32 * 16 // time for SOF transfer + - (DecodeTag.lastBit != SOF_PART2?32*16:0); // time for EOF transfer + LogTrace_ISO15693(DecodeTag.output, DecodeTag.len, sof_time*4, eof_time*4, 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 = false; + // upTo = dmaBuf; + // samples = 0; + // FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + // continue; + } else { + TagIsActive = (DecodeTag.state >= STATE_TAG_RECEIVING_DATA); } - TagIsActive = (DecodeTag.state >= STATE_TAG_RECEIVING_DATA); } } FpgaDisableSscDma(); - BigBuf_free(); - - LEDsoff(); DbpString("Snoop statistics:"); - Dbprintf(" ExpectTagAnswer: %d", ExpectTagAnswer); + Dbprintf(" ExpectTagAnswer: %d, TagIsActive: %d, ReaderIsActive: %d", ExpectTagAnswer, TagIsActive, ReaderIsActive); Dbprintf(" DecodeTag State: %d", DecodeTag.state); Dbprintf(" DecodeTag byteCnt: %d", DecodeTag.len); + Dbprintf(" DecodeTag posCount: %d", DecodeTag.posCount); Dbprintf(" DecodeReader State: %d", DecodeReader.state); Dbprintf(" DecodeReader byteCnt: %d", DecodeReader.byteCount); + Dbprintf(" DecodeReader posCount: %d", DecodeReader.posCount); Dbprintf(" Trace length: %d", BigBuf_get_traceLen()); + Dbprintf(" Max behindBy: %d", max_behindBy); } // Initialize the proxmark as iso15k reader -static void Iso15693InitReader() { +void Iso15693InitReader(void) { FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - // Setup SSC - // FpgaSetupSsc(); - // Start from off (no field generated) - LED_D_OFF(); + // switch field off and wait until tag resets FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); SpinDelay(10); - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + // switch field on + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); + LED_D_ON(); + + // initialize SSC and select proper AD input FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - // Give the tags time to energize - LED_D_ON(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); + // give tags some time to energize SpinDelay(250); } @@ -1196,14 +1382,11 @@ static void Iso15693InitReader() { // uid is in transmission order (which is reverse of display order) -static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) -{ - uint8_t cmd[13]; - +static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber, uint8_t *cmd) { uint16_t crc; // 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; + cmd[0] = ISO15693_REQ_OPTION | ISO15693_REQ_ADDRESS | ISO15693_REQ_DATARATE_HIGH; // READ BLOCK command code cmd[1] = ISO15693_READBLOCK; // UID may be optionally specified here @@ -1219,17 +1402,15 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) // Block number to read cmd[10] = blockNumber; //Now the CRC - crc = Crc(cmd, 11); // the crc needs to be calculated over 11 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; @@ -1246,7 +1427,7 @@ static void BuildInventoryResponse(uint8_t *uid) 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; @@ -1254,36 +1435,54 @@ static void BuildInventoryResponse(uint8_t *uid) } // 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 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) { - - LED_A_ON(); - LED_B_OFF(); - LED_C_OFF(); - - if (init) Iso15693InitReader(); +// init ... should we initialize the reader? +// speed ... 0 low speed, 1 hi speed +// *recv will contain the tag's answer +// return: length of received data, or -1 for timeout +int SendDataTag(uint8_t *send, int sendlen, bool init, bool speed_fast, uint8_t *recv, uint16_t max_recv_len, uint32_t start_time, uint16_t timeout, uint32_t *eof_time) { + + if (init) { + Iso15693InitReader(); + StartCountSspClk(); + } - int answerLen=0; + int answerLen = 0; - if (!speed) { - // low speed (1 out of 256) - CodeIso15693AsReader256(send, sendlen); - } else { + if (speed_fast) { // high speed (1 out of 4) CodeIso15693AsReader(send, sendlen); + } else { + // low speed (1 out of 256) + CodeIso15693AsReader256(send, sendlen); } - TransmitTo15693Tag(ToSend, ToSendMax, start_time); + TransmitTo15693Tag(ToSend, ToSendMax, &start_time); + uint32_t end_time = start_time + 32*(8*ToSendMax-4); // substract the 4 padding bits after EOF + LogTrace_ISO15693(send, sendlen, start_time*4, end_time*4, NULL, true); // Now wait for a response if (recv != NULL) { - answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, DELAY_ISO15693_VCD_TO_VICC_READER * 2); + answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, timeout, eof_time); } - LED_A_OFF(); + return answerLen; +} + + +int SendDataTagEOF(uint8_t *recv, uint16_t max_recv_len, uint32_t start_time, uint16_t timeout, uint32_t *eof_time) { + + int answerLen = 0; + + CodeIso15693AsReaderEOF(); + + TransmitTo15693Tag(ToSend, ToSendMax, &start_time); + uint32_t end_time = start_time + 32*(8*ToSendMax-4); // substract the 4 padding bits after EOF + LogTrace_ISO15693(NULL, 0, start_time*4, end_time*4, NULL, true); + + // Now wait for a response + if (recv != NULL) { + answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, timeout, eof_time); + } return answerLen; } @@ -1341,7 +1540,7 @@ void DbdecodeIso15693Answer(int len, uint8_t *d) { strncat(status,"NoErr ", DBD15STATLEN); } - crc=Crc(d,len-2); + crc=Iso15693Crc(d,len-2); if ( (( crc & 0xff ) == d[len-2]) && (( crc >> 8 ) == d[len-1]) ) strncat(status,"CrcOK",DBD15STATLEN); else @@ -1368,48 +1567,27 @@ void SetDebugIso15693(uint32_t debug) { // 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(); +void ReaderIso15693(uint32_t parameter) { + LED_A_ON(); set_tracing(true); - - int answerLen = 0; - uint8_t TagUID[8] = {0x00}; - - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + uint8_t TagUID[8] = {0x00}; uint8_t answer[ISO15693_MAX_RESPONSE_LENGTH]; - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - // Setup SSC - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); - - // Start from off (no field generated) - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); - - // Give the tags time to energize - LED_D_ON(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); - 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, 0); - - // Now wait for a response - answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC_READER * 2) ; - uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD_READER; + uint8_t cmd[5]; + BuildIdentifyRequest(cmd); + uint32_t start_time = 0; + uint32_t eof_time; + int answerLen = SendDataTag(cmd, sizeof(cmd), true, true, answer, sizeof(answer), start_time, ISO15693_READER_TIMEOUT, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; - if (answerLen >=12) // we should do a better check than this - { + if (answerLen >= 12) { // we should do a better check than this TagUID[0] = answer[2]; TagUID[1] = answer[3]; TagUID[2] = answer[4]; @@ -1418,7 +1596,6 @@ void ReaderIso15693(uint32_t parameter) TagUID[5] = answer[7]; TagUID[6] = answer[8]; // IC Manufacturer code TagUID[7] = answer[9]; // always E0 - } Dbprintf("%d octets read from IDENTIFY request:", answerLen); @@ -1431,22 +1608,13 @@ void ReaderIso15693(uint32_t parameter) TagUID[7],TagUID[6],TagUID[5],TagUID[4], TagUID[3],TagUID[2],TagUID[1],TagUID[0]); - - // Dbprintf("%d octets read from SELECT request:", answerLen2); - // DbdecodeIso15693Answer(answerLen2,answer2); - // Dbhexdump(answerLen2,answer2,true); - - // Dbprintf("%d octets read from XXX request:", answerLen3); - // DbdecodeIso15693Answer(answerLen3,answer3); - // Dbhexdump(answerLen3,answer3,true); - // read all pages 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; + uint8_t cmd[13]; + BuildReadBlockRequest(TagUID, i, cmd); + answerLen = SendDataTag(cmd, sizeof(cmd), false, true, answer, sizeof(answer), start_time, ISO15693_READER_TIMEOUT, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; if (answerLen > 0) { Dbprintf("READ SINGLE BLOCK %d returned %d octets:", i, answerLen); DbdecodeIso15693Answer(answerLen, answer); @@ -1456,82 +1624,83 @@ void ReaderIso15693(uint32_t parameter) } } - // for the time being, switch field off to protect rdv4.0 + // for the time being, switch field off to protect RDV4 // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); LED_A_OFF(); } -// 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(); - +// Initialize the proxmark as iso15k tag +void Iso15693InitTag(void) { FpgaDownloadAndGo(FPGA_BITSTREAM_HF); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); + LED_D_OFF(); FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR); - StartCountSspClk(); +} - uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; + +// 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) { + + LED_A_ON(); + + Iso15693InitTag(); // Build a suitable response to the reader INVENTORY command BuildInventoryResponse(uid); // Listen to reader while (!BUTTON_PRESS()) { + uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; 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, slow); + start_time = eof_time + DELAY_ISO15693_VCD_TO_VICC_SIM; + TransmitTo15693Reader(ToSend, ToSendMax, &start_time, 0, slow); } Dbprintf("%d bytes read from reader:", cmd_len); Dbhexdump(cmd_len, cmd, false); } - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LEDsoff(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + LED_A_OFF(); } // 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) -{ - LEDsoff(); +void BruteforceIso15693Afi(uint32_t speed) { LED_A_ON(); uint8_t data[6]; uint8_t recv[ISO15693_MAX_RESPONSE_LENGTH]; - - int datalen=0, recvlen=0; + int datalen = 0, recvlen = 0; + uint32_t eof_time; - Iso15693InitReader(); - StartCountSspClk(); - // first without AFI // 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_VICC_TO_VCD_READER; + datalen = Iso15693AddCrc(data,3); + uint32_t start_time = GetCountSspClk(); + recvlen = SendDataTag(data, datalen, true, speed, recv, sizeof(recv), 0, ISO15693_READER_TIMEOUT, &eof_time); + start_time = eof_time + 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 @@ -1543,51 +1712,79 @@ void BruteforceIso15693Afi(uint32_t speed) 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_VICC_TO_VCD_READER; + datalen = Iso15693AddCrc(data,4); + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time, ISO15693_READER_TIMEOUT, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; WDT_HIT(); if (recvlen >= 12) { - Dbprintf("AFI=%i UID=%s", i, sprintUID(NULL, &recv[2])); + Dbprintf("AFI=%i UID=%s", i, Iso15693sprintUID(NULL, &recv[2])); } } Dbprintf("AFI Bruteforcing done."); - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LEDsoff(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + LED_A_OFF(); + } // 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[]) { + LED_A_ON(); + int recvlen = 0; uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; + uint32_t eof_time; - LED_A_ON(); + uint16_t timeout; + bool request_answer = false; + + switch (data[1]) { + case ISO15693_WRITEBLOCK: + case ISO15693_LOCKBLOCK: + case ISO15693_WRITE_MULTI_BLOCK: + case ISO15693_WRITE_AFI: + case ISO15693_LOCK_AFI: + case ISO15693_WRITE_DSFID: + case ISO15693_LOCK_DSFID: + timeout = ISO15693_READER_TIMEOUT_WRITE; + request_answer = data[0] & ISO15693_REQ_OPTION; + break; + default: + timeout = ISO15693_READER_TIMEOUT; + } if (DEBUG) { Dbprintf("SEND:"); Dbhexdump(datalen, data, false); } - recvlen = SendDataTag(data, datalen, true, speed, (recv?recvbuf:NULL), sizeof(recvbuf), 0); + recvlen = SendDataTag(data, datalen, true, speed, (recv?recvbuf:NULL), sizeof(recvbuf), 0, timeout, &eof_time); + + if (request_answer) { // send a single EOF to get the tag response + recvlen = SendDataTagEOF((recv?recvbuf:NULL), sizeof(recvbuf), 0, ISO15693_READER_TIMEOUT, &eof_time); + } + + // 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(); if (recv) { if (DEBUG) { Dbprintf("RECV:"); - Dbhexdump(recvlen, recvbuf, false); - DbdecodeIso15693Answer(recvlen, recvbuf); + if (recvlen > 0) { + 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); - + if (recvlen > ISO15693_MAX_RESPONSE_LENGTH) { + recvlen = ISO15693_MAX_RESPONSE_LENGTH; + } + cmd_send(CMD_ACK, 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(); } @@ -1596,79 +1793,66 @@ void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint // //----------------------------------------------------------------------------- -// 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 = Crc(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(); +// Set the UID on Magic ISO15693 tag (based on Iceman's LUA-script). +void SetTag15693Uid(uint8_t *uid) { + + LED_A_ON(); + + uint8_t cmd[4][9] = { + {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x3e, 0x00, 0x00, 0x00, 0x00}, + {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x3f, 0x69, 0x96, 0x00, 0x00}, + {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x38}, + {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x39} + }; + + uint16_t crc; + + int recvlen = 0; + uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; + uint32_t eof_time; + + // Command 3 : 022138u8u7u6u5 (where uX = uid byte X) + 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][3] = uid[3]; + cmd[3][4] = uid[2]; + cmd[3][5] = uid[1]; + cmd[3][6] = uid[0]; + + uint32_t start_time = 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; + + recvlen = SendDataTag(cmd[i], sizeof(cmd[i]), i==0?true:false, true, recvbuf, sizeof(recvbuf), start_time, ISO15693_READER_TIMEOUT_WRITE, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; + if (DEBUG) { + Dbprintf("SEND:"); + Dbhexdump(sizeof(cmd[i]), cmd[i], false); + Dbprintf("RECV:"); + if (recvlen > 0) { + Dbhexdump(recvlen, recvbuf, false); + DbdecodeIso15693Answer(recvlen, recvbuf); + } + } + // Note: need to know if we expect an answer from one of the magic commands + // if (recvlen < 0) { + // break; + // } + } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + + cmd_send(CMD_ACK, recvlen, 0, 0, recvbuf, recvlen); + LED_A_OFF(); } @@ -1702,7 +1886,7 @@ 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; @@ -1737,7 +1921,7 @@ 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; @@ -1770,9 +1954,9 @@ 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; @@ -1805,9 +1989,9 @@ static void __attribute__((unused)) BuildArbitraryCustomRequest(uint8_t uid[], u 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;