X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/5b12974a7f01a94c40552402b66b01bf8ec0e214..a3bef9863b9e06a820c7559b9caffeaaa1bb575b:/armsrc/iso15693.c diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c index f33e0156..fff8b370 100644 --- a/armsrc/iso15693.c +++ b/armsrc/iso15693.c @@ -64,8 +64,26 @@ #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_TAG_TO_ARM 32 +#define DELAY_ARM_TO_TAG 16 + static int DEBUG = 0; + +// 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); +} + + /////////////////////////////////////////////////////////////////////// // ISO 15693 Part 2 - Air Interface // This section basically contains transmission and receiving of bits @@ -84,84 +102,37 @@ 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); - } + // EOF + ToSend[++ToSendMax] = 0x20; //0010 + 0000 padding + ToSendMax++; } @@ -170,46 +141,26 @@ static void CodeIso15693AsReader(uint8_t *cmd, int n) // 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++; } @@ -246,6 +197,8 @@ static void CodeIso15693AsReader256(uint8_t *cmd, int n) // } // } +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; @@ -280,16 +233,9 @@ void CodeIso15693AsTag(uint8_t *cmd, size_t len) { ToSend[++ToSendMax] = 0x1D; // 00011101 // data - for(int i = 0; i < len; 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 @@ -300,46 +246,70 @@ void CodeIso15693AsTag(uint8_t *cmd, size_t len) { // 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); + + *start_time = (*start_time - DELAY_ARM_TO_TAG) & 0xfffffff0; + + while (GetCountSspClk() > *start_time) { // we may miss the intended time + *start_time += 16; // next possible time + } - while (GetCountSspClk() < start_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))) ; AT91C_BASE_SSC->SSC_THR = send_word; + data <<= 1; } 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[]. //----------------------------------------------------------------------------- -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; + 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() < (modulation_start_time & 0xfffffff8)) + /* wait */ ; + + uint8_t shift_delay = modulation_start_time & 0x00000007; - while (GetCountSspClk() < (start_time & 0xfffffff8)) ; + *start_time = modulation_start_time + DELAY_ARM_TO_READER - 3 * 8; 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 = 7; i >= 0; i--) { + 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) { @@ -361,7 +331,6 @@ void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, } } LED_C_OFF(); - } @@ -379,15 +348,18 @@ void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, // false if we are still waiting for some more //============================================================================= -#define NOISE_THRESHOLD 160 // don't try to correlate noise +#define NOISE_THRESHOLD 160 // 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; @@ -402,6 +374,9 @@ typedef struct DecodeTag { uint8_t *output; int len; int sum1, sum2; + int threshold_sof; + int threshold_half; + uint16_t previous_amplitude; } DecodeTag_t; @@ -409,40 +384,58 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1 { 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 { + // 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; + 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->previous_amplitude > DecodeTag->threshold_sof) { // 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 = MAX_PREVIOUS_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; @@ -451,11 +444,18 @@ 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 = MAX_PREVIOUS_AMPLITUDE; DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); } @@ -473,18 +473,16 @@ 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 = MAX_PREVIOUS_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 @@ -496,20 +494,21 @@ 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 = MAX_PREVIOUS_AMPLITUDE; DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); } else { @@ -519,9 +518,11 @@ 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 = MAX_PREVIOUS_AMPLITUDE; DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); } @@ -529,6 +530,15 @@ 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; } @@ -546,21 +556,42 @@ 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 = MAX_PREVIOUS_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 = MAX_PREVIOUS_AMPLITUDE; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); } } DecodeTag->posCount++; break; - } return false; @@ -569,6 +600,7 @@ static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint1 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; @@ -580,18 +612,19 @@ 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 = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); + uint16_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; // the Decoder data structure DecodeTag_t DecodeTag = { 0 }; @@ -606,6 +639,7 @@ 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(;;) { @@ -613,12 +647,19 @@ 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)) { Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); + ret = -1; break; } } @@ -627,30 +668,42 @@ 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 (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 (DecodeTag.len > 0) { - LogTrace(DecodeTag.output, DecodeTag.len, 0, 0, NULL, false); + 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; } @@ -827,6 +880,7 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin break; case STATE_READER_RECEIVE_DATA_1_OUT_OF_4: + bit = !!bit; DecodeReader->posCount++; if (DecodeReader->posCount == 1) { DecodeReader->sum1 = bit; @@ -839,17 +893,14 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin } 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 + if (DecodeReader->sum1 >= 3 && DecodeReader->sum2 <= 1) { // detected a 2bit position DecodeReader->shiftReg >>= 2; DecodeReader->shiftReg |= (DecodeReader->bitCount << 6); } @@ -869,6 +920,7 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin break; case STATE_READER_RECEIVE_DATA_1_OUT_OF_256: + bit = !!bit; DecodeReader->posCount++; if (DecodeReader->posCount == 1) { DecodeReader->sum1 = bit; @@ -881,17 +933,14 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin } 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 + if (DecodeReader->sum1 >= 3 && DecodeReader->sum2 <= 1) { // detected the bit position DecodeReader->shiftReg = DecodeReader->bitCount; } if (DecodeReader->bitCount == 255) { // we have a full byte @@ -974,7 +1023,7 @@ int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eo 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 + *eof_time = dma_start_time + samples - DELAY_READER_TO_ARM; // end of EOF gotFrame = true; break; } @@ -1003,7 +1052,7 @@ int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eo - 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); + LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*32, *eof_time*32, NULL, true); } return DecodeReader.byteCount; @@ -1057,7 +1106,8 @@ void AcquireRawAdcSamplesIso15693(void) 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)) ; @@ -1153,7 +1203,7 @@ void SnoopIso15693(void) if (Handle15693SampleFromReader(snoopdata & 0x02, &DecodeReader)) { FpgaDisableSscDma(); ExpectTagAnswer = true; - LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); + LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, samples*64, samples*64, NULL, true); /* And ready to receive another command. */ DecodeReaderReset(&DecodeReader); /* And also reset the demod code, which might have been */ @@ -1165,7 +1215,7 @@ void SnoopIso15693(void) if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) { FpgaDisableSscDma(); ExpectTagAnswer = true; - LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); + LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, samples*64, samples*64, NULL, true); /* And ready to receive another command. */ DecodeReaderReset(&DecodeReader); /* And also reset the demod code, which might have been */ @@ -1181,7 +1231,7 @@ void SnoopIso15693(void) if (Handle15693SamplesFromTag(snoopdata >> 2, &DecodeTag)) { FpgaDisableSscDma(); //Use samples as a time measurement - LogTrace(DecodeTag.output, DecodeTag.len, samples, samples, NULL, false); + LogTrace_ISO15693(DecodeTag.output, DecodeTag.len, samples*64, samples*64, NULL, false); // And ready to receive another response. DecodeTagReset(&DecodeTag); DecodeReaderReset(&DecodeReader); @@ -1210,10 +1260,8 @@ void SnoopIso15693(void) // Initialize the proxmark as iso15k reader -static void Iso15693InitReader() { +void Iso15693InitReader() { FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - // Setup SSC - // FpgaSetupSsc(); // Start from off (no field generated) LED_D_OFF(); @@ -1297,17 +1345,20 @@ static void BuildInventoryResponse(uint8_t *uid) // 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) { +// return: length of received data, or -1 for timeout +int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t *recv, uint16_t max_recv_len, uint32_t start_time, uint32_t *eof_time) { LED_A_ON(); LED_B_OFF(); LED_C_OFF(); - if (init) Iso15693InitReader(); - - int answerLen=0; - + if (init) { + Iso15693InitReader(); + StartCountSspClk(); + } + + int answerLen = 0; + if (!speed) { // low speed (1 out of 256) CodeIso15693AsReader256(send, sendlen); @@ -1316,11 +1367,14 @@ int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t *recv, CodeIso15693AsReader(send, sendlen); } - TransmitTo15693Tag(ToSend, ToSendMax, start_time); + if (start_time == 0) { + start_time = GetCountSspClk(); + } + TransmitTo15693Tag(ToSend, ToSendMax, &start_time); // 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, DELAY_ISO15693_VCD_TO_VICC_READER * 2, eof_time); } LED_A_OFF(); @@ -1442,11 +1496,13 @@ void ReaderIso15693(uint32_t parameter) // Now send the IDENTIFY command BuildIdentifyRequest(); - TransmitTo15693Tag(ToSend, ToSendMax, 0); + uint32_t start_time = 0; + TransmitTo15693Tag(ToSend, ToSendMax, &start_time); // 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; + uint32_t eof_time; + answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC_READER * 2, &eof_time) ; + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; if (answerLen >=12) // we should do a better check than this { @@ -1484,9 +1540,9 @@ void ReaderIso15693(uint32_t parameter) 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; + TransmitTo15693Tag(ToSend, ToSendMax, &start_time); + int answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC_READER * 2, &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); @@ -1532,8 +1588,8 @@ void SimTagIso15693(uint32_t parameter, uint8_t *uid) 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); @@ -1554,11 +1610,8 @@ void BruteforceIso15693Afi(uint32_t speed) uint8_t data[6]; uint8_t recv[ISO15693_MAX_RESPONSE_LENGTH]; - - int datalen=0, recvlen=0; - - Iso15693InitReader(); - StartCountSspClk(); + int datalen = 0, recvlen = 0; + uint32_t eof_time; // first without AFI // Tags should respond without AFI and with AFI=0 even when AFI is active @@ -1567,8 +1620,9 @@ void BruteforceIso15693Afi(uint32_t speed) 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; + uint32_t start_time = GetCountSspClk(); + recvlen = SendDataTag(data, datalen, true, speed, recv, sizeof(recv), 0, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; WDT_HIT(); if (recvlen>=12) { Dbprintf("NoAFI UID=%s", Iso15693sprintUID(NULL, &recv[2])); @@ -1584,8 +1638,8 @@ void BruteforceIso15693Afi(uint32_t speed) 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; + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; WDT_HIT(); if (recvlen >= 12) { Dbprintf("AFI=%i UID=%s", i, Iso15693sprintUID(NULL, &recv[2])); @@ -1602,7 +1656,8 @@ void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint int recvlen = 0; uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; - + uint32_t eof_time; + LED_A_ON(); if (DEBUG) { @@ -1610,24 +1665,27 @@ void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint 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, &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(); } @@ -1645,7 +1703,8 @@ void SetTag15693Uid(uint8_t *uid) int recvlen = 0; uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; - + uint32_t eof_time; + LED_A_ON(); // Command 1 : 02213E00000000 @@ -1684,7 +1743,7 @@ void SetTag15693Uid(uint8_t *uid) cmd[3][5] = uid[1]; cmd[3][6] = uid[0]; - for (int i=0; i<4; i++) { + for (int i = 0; i < 4; i++) { // Add the CRC crc = Iso15693Crc(cmd[i], 7); cmd[i][7] = crc & 0xff; @@ -1695,12 +1754,14 @@ void SetTag15693Uid(uint8_t *uid) Dbhexdump(sizeof(cmd[i]), cmd[i], false); } - recvlen = SendDataTag(cmd[i], sizeof(cmd[i]), true, 1, recvbuf, sizeof(recvbuf), 0); + recvlen = SendDataTag(cmd[i], sizeof(cmd[i]), true, 1, recvbuf, sizeof(recvbuf), 0, &eof_time); 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);