X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/bdf96aae39d6df270de7f6f58dc034e35434d933..c0e7527dddf79e1d2758eb4dd55a6b0574fe0a9a:/armsrc/iso15693.c diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c index da2aab69..9dc4bf18 100644 --- a/armsrc/iso15693.c +++ b/armsrc/iso15693.c @@ -47,9 +47,10 @@ // *) add anti-collision support for inventory-commands // *) read security status of a block // *) sniffing and simulation do not support two subcarrier modes. -// *) remove or refactor code under "depricated" +// *) remove or refactor code under "deprecated" // *) document all the functions +#include "iso15693.h" #include "proxmark3.h" #include "util.h" @@ -58,6 +59,7 @@ #include "iso15693tools.h" #include "protocols.h" #include "cmd.h" +#include "BigBuf.h" #define arraylen(x) (sizeof(x)/sizeof((x)[0])) @@ -68,27 +70,20 @@ static int DEBUG = 0; // This section basicly contains transmission and receiving of bits /////////////////////////////////////////////////////////////////////// -#define FrameSOF Iso15693FrameSOF -#define Logic0 Iso15693Logic0 -#define Logic1 Iso15693Logic1 -#define FrameEOF Iso15693FrameEOF - #define Crc(data,datalen) Iso15693Crc(data,datalen) #define AddCrc(data,datalen) Iso15693AddCrc(data,datalen) #define sprintUID(target,uid) Iso15693sprintUID(target,uid) -// approximate amplitude=sqrt(ci^2+cq^2) by amplitude = max(|ci|,|cq|) + 1/2*min(|ci|,|cq|) -#define AMPLITUDE(ci, cq) (MAX(ABS(ci), ABS(cq)) + MIN(ABS(ci), ABS(cq))/2) - // buffers -#define ISO15693_DMA_BUFFER_SIZE 128 -#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 +#define ISO15693_DMA_BUFFER_SIZE 2048 // must be a power of 2 +#define ISO15693_MAX_RESPONSE_LENGTH 36 // allows read single block with the maximum block size of 256bits. Read multiple blocks not supported yet +#define ISO15693_MAX_COMMAND_LENGTH 45 // allows write single block with the maximum block size of 256bits. Write multiple blocks not supported yet // timing. Delays in SSP_CLK ticks. #define DELAY_READER_TO_ARM 8 #define DELAY_ARM_TO_READER 1 #define DELAY_ISO15693_VCD_TO_VICC 132 // 132/423.75kHz = 311.5us from end of EOF to start of tag response +#define DELAY_ISO15693_VICC_TO_VCD 1017 // 1017/3.39MHz = 300us between end of tag response and next reader command // --------------------------- // Signal Processing @@ -271,11 +266,13 @@ static void CodeIso15693AsTag(uint8_t *cmd, int n) // Transmit the command (to the tag) that was placed in cmd[]. -static void TransmitTo15693Tag(const uint8_t *cmd, int len) +static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time) { FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); + while (GetCountSspClk() < start_time); + LED_B_ON(); for(int c = 0; c < len; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { @@ -302,6 +299,7 @@ static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start } while (GetCountSspClk() < (start_time & 0xfffffff8)) ; + AT91C_BASE_SSC->SSC_THR = 0x00; // clear TXRDY LED_C_ON(); @@ -329,7 +327,7 @@ static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start //============================================================================= // An ISO 15693 decoder for tag responses (one subcarrier only). -// Uses cross correlation to identify the SOF, each bit, and EOF. +// Uses cross correlation to identify each bit and EOF. // This function is called 8 times per bit (every 2 subcarrier cycles). // Subcarrier frequency fs is 424kHz, 1/fs = 2,36us, // i.e. function is called every 4,72us @@ -341,16 +339,15 @@ static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start // false if we are still waiting for some more //============================================================================= -#define SUBCARRIER_DETECT_THRESHOLD 2 -#define SOF_CORRELATOR_LEN (1<<5) +#define NOISE_THRESHOLD 160 // don't try to correlate noise typedef struct DecodeTag { enum { - STATE_TAG_UNSYNCD, - STATE_TAG_AWAIT_SOF_1, - STATE_TAG_AWAIT_SOF_2, + STATE_TAG_SOF_LOW, + STATE_TAG_SOF_HIGH, + STATE_TAG_SOF_HIGH_END, STATE_TAG_RECEIVING_DATA, - STATE_TAG_AWAIT_EOF + STATE_TAG_EOF } state; int bitCount; int posCount; @@ -361,84 +358,68 @@ typedef struct DecodeTag { SOF_PART2 } lastBit; uint16_t shiftReg; + uint16_t max_len; uint8_t *output; int len; int sum1, sum2; - uint8_t SOF_low; - uint8_t SOF_high; - uint8_t SOF_last; - int32_t SOF_corr; - int32_t SOF_corr_prev; - uint8_t SOF_correlator[SOF_CORRELATOR_LEN]; } DecodeTag_t; -static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTag) + +static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag) { switch(DecodeTag->state) { - case STATE_TAG_UNSYNCD: - // initialize SOF correlator. We are looking for 12 samples low and 12 samples high. - DecodeTag->SOF_low = 0; - DecodeTag->SOF_high = 12; - DecodeTag->SOF_last = 23; - memset(DecodeTag->SOF_correlator, 0x00, DecodeTag->SOF_last + 1); - DecodeTag->SOF_correlator[DecodeTag->SOF_last] = AMPLITUDE(ci,cq); - DecodeTag->SOF_corr = DecodeTag->SOF_correlator[DecodeTag->SOF_last]; - DecodeTag->SOF_corr_prev = DecodeTag->SOF_corr; - // initialize Decoder - DecodeTag->posCount = 0; - DecodeTag->bitCount = 0; - DecodeTag->len = 0; - DecodeTag->state = STATE_TAG_AWAIT_SOF_1; - break; - - case STATE_TAG_AWAIT_SOF_1: - // calculate the correlation in real time. Look at differences only. - DecodeTag->SOF_corr += DecodeTag->SOF_correlator[DecodeTag->SOF_low++]; - DecodeTag->SOF_corr -= 2*DecodeTag->SOF_correlator[DecodeTag->SOF_high++]; - DecodeTag->SOF_last++; - DecodeTag->SOF_low &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_high &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_last &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_correlator[DecodeTag->SOF_last] = AMPLITUDE(ci,cq); - DecodeTag->SOF_corr += DecodeTag->SOF_correlator[DecodeTag->SOF_last]; - - // if correlation increases for 10 consecutive samples, we are close to maximum correlation - if (DecodeTag->SOF_corr > DecodeTag->SOF_corr_prev + SUBCARRIER_DETECT_THRESHOLD) { + case STATE_TAG_SOF_LOW: + // waiting for 12 times low (11 times low is accepted as well) + if (amplitude < NOISE_THRESHOLD) { DecodeTag->posCount++; } else { - DecodeTag->posCount = 0; + if (DecodeTag->posCount > 10) { + DecodeTag->posCount = 1; + DecodeTag->sum1 = 0; + DecodeTag->state = STATE_TAG_SOF_HIGH; + } else { + DecodeTag->posCount = 0; + } } - - if (DecodeTag->posCount == 10) { // correlation increased 10 times - DecodeTag->state = STATE_TAG_AWAIT_SOF_2; + break; + + case STATE_TAG_SOF_HIGH: + // waiting for 10 times high. Take average over the last 8 + if (amplitude > NOISE_THRESHOLD) { + DecodeTag->posCount++; + if (DecodeTag->posCount > 2) { + DecodeTag->sum1 += amplitude; // keep track of average high value + } + if (DecodeTag->posCount == 10) { + DecodeTag->sum1 >>= 4; // calculate half of average high value (8 samples) + DecodeTag->state = STATE_TAG_SOF_HIGH_END; + } + } else { // high phase was too short + DecodeTag->posCount = 1; + DecodeTag->state = STATE_TAG_SOF_LOW; } - - DecodeTag->SOF_corr_prev = DecodeTag->SOF_corr; - break; - case STATE_TAG_AWAIT_SOF_2: - // calculate the correlation in real time. Look at differences only. - DecodeTag->SOF_corr += DecodeTag->SOF_correlator[DecodeTag->SOF_low++]; - DecodeTag->SOF_corr -= 2*DecodeTag->SOF_correlator[DecodeTag->SOF_high++]; - DecodeTag->SOF_last++; - DecodeTag->SOF_low &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_high &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_last &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_correlator[DecodeTag->SOF_last] = AMPLITUDE(ci,cq); - DecodeTag->SOF_corr += DecodeTag->SOF_correlator[DecodeTag->SOF_last]; - - if (DecodeTag->SOF_corr >= DecodeTag->SOF_corr_prev) { // we are looking for the maximum correlation - DecodeTag->SOF_corr_prev = DecodeTag->SOF_corr; - } else { - DecodeTag->lastBit = SOF_PART1; // detected 1st part of SOF - DecodeTag->sum1 = DecodeTag->SOF_correlator[DecodeTag->SOF_last]; + case STATE_TAG_SOF_HIGH_END: + // waiting for a falling edge + if (amplitude < DecodeTag->sum1) { // signal drops below 50% average high: a falling edge + DecodeTag->lastBit = SOF_PART1; // detected 1st part of SOF (12 samples low and 12 samples high) + DecodeTag->shiftReg = 0; + DecodeTag->bitCount = 0; + DecodeTag->len = 0; + DecodeTag->sum1 = amplitude; DecodeTag->sum2 = 0; DecodeTag->posCount = 2; DecodeTag->state = STATE_TAG_RECEIVING_DATA; LED_C_ON(); + } else { + DecodeTag->posCount++; + if (DecodeTag->posCount > 13) { // high phase too long + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } } - break; case STATE_TAG_RECEIVING_DATA: @@ -446,23 +427,27 @@ static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTa DecodeTag->sum1 = 0; DecodeTag->sum2 = 0; } - if (DecodeTag->posCount <= 4) { - DecodeTag->sum1 += AMPLITUDE(ci, cq); + DecodeTag->sum1 += amplitude; } else { - DecodeTag->sum2 += AMPLITUDE(ci, cq); + DecodeTag->sum2 += amplitude; } - if (DecodeTag->posCount == 8) { - int16_t corr_1 = (DecodeTag->sum2 - DecodeTag->sum1) / 4; - int16_t corr_0 = (DecodeTag->sum1 - DecodeTag->sum2) / 4; - int16_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 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) { - DecodeTag->state = STATE_TAG_AWAIT_EOF; + if (DecodeTag->lastBit == LOGIC0) { // this was already part of EOF + DecodeTag->state = STATE_TAG_EOF; + } else { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } } else if (corr_1 > corr_0) { // logic 1 if (DecodeTag->lastBit == SOF_PART1) { // still part of SOF - DecodeTag->lastBit = SOF_PART2; + DecodeTag->lastBit = SOF_PART2; // SOF completed } else { DecodeTag->lastBit = LOGIC1; DecodeTag->shiftReg >>= 1; @@ -471,6 +456,12 @@ static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTa if (DecodeTag->bitCount == 8) { DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; DecodeTag->len++; + if (DecodeTag->len > DecodeTag->max_len) { + // buffer overflow, give up + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } DecodeTag->bitCount = 0; DecodeTag->shiftReg = 0; } @@ -478,7 +469,8 @@ static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTa } else { // logic 0 if (DecodeTag->lastBit == SOF_PART1) { // incomplete SOF - DecodeTag->state = STATE_TAG_UNSYNCD; + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); } else { DecodeTag->lastBit = LOGIC0; @@ -487,6 +479,12 @@ static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTa if (DecodeTag->bitCount == 8) { DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; DecodeTag->len++; + if (DecodeTag->len > DecodeTag->max_len) { + // buffer overflow, give up + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } DecodeTag->bitCount = 0; DecodeTag->shiftReg = 0; } @@ -497,89 +495,106 @@ static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTa DecodeTag->posCount++; break; - case STATE_TAG_AWAIT_EOF: - if (DecodeTag->lastBit == LOGIC0) { // this was already part of EOF - LED_C_OFF(); - return true; + case STATE_TAG_EOF: + if (DecodeTag->posCount == 1) { + DecodeTag->sum1 = 0; + DecodeTag->sum2 = 0; + } + if (DecodeTag->posCount <= 4) { + DecodeTag->sum1 += amplitude; } else { - DecodeTag->state = STATE_TAG_UNSYNCD; - LED_C_OFF(); + DecodeTag->sum2 += amplitude; } + if (DecodeTag->posCount == 8) { + int32_t corr_1 = DecodeTag->sum2 - DecodeTag->sum1; + int32_t corr_0 = -corr_1; + int32_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 2; + if (corr_EOF > corr_0 || corr_1 > corr_0) { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } else { + LED_C_OFF(); + return true; + } + } + DecodeTag->posCount++; break; - default: - DecodeTag->state = STATE_TAG_UNSYNCD; - LED_C_OFF(); - break; } return false; } -static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data) +static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_len) { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; DecodeTag->output = data; - DecodeTag->state = STATE_TAG_UNSYNCD; + DecodeTag->max_len = max_len; +} + + +static void DecodeTagReset(DecodeTag_t *DecodeTag) +{ + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; } + /* * Receive and decode the tag response, also log to tracebuffer */ -static int GetIso15693AnswerFromTag(uint8_t* response, int timeout) +static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int timeout) { - int maxBehindBy = 0; - int lastRxCounter, samples = 0; - int8_t ci, cq; + int samples = 0; bool gotFrame = false; - 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; - DecodeTagInit(&DecodeTag, response); + DecodeTag_t DecodeTag = { 0 }; + DecodeTagInit(&DecodeTag, response, max_len); // wait for last transfer to complete while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); // And put the FPGA in the appropriate mode - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_AMPLITUDE); // Setup and start DMA. FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); uint16_t *upTo = dmaBuf; - lastRxCounter = ISO15693_DMA_BUFFER_SIZE; for(;;) { - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO15693_DMA_BUFFER_SIZE-1); - if(behindBy > maxBehindBy) { - maxBehindBy = behindBy; - } + uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); - if (behindBy < 1) continue; + if (behindBy == 0) continue; - ci = (int8_t)(*upTo >> 8); - cq = (int8_t)(*upTo & 0xff); + uint16_t tagdata = *upTo++; - upTo++; - lastRxCounter--; if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. upTo = dmaBuf; // start reading the circular buffer from the beginning - lastRxCounter += ISO15693_DMA_BUFFER_SIZE; + if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); + break; + } } if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers } + samples++; - if (Handle15693SamplesFromTag(ci, cq, &DecodeTag)) { + if (Handle15693SamplesFromTag(tagdata, &DecodeTag)) { gotFrame = true; break; } - if(samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) { + if (samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) { DecodeTag.len = 0; break; } @@ -587,11 +602,12 @@ static int GetIso15693AnswerFromTag(uint8_t* response, int timeout) } FpgaDisableSscDma(); + BigBuf_free(); + + if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", + samples, gotFrame, DecodeTag.state, DecodeTag.len, DecodeTag.bitCount, DecodeTag.posCount); - if (DEBUG) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", - maxBehindBy, samples, gotFrame, DecodeTag.state, DecodeTag.len, DecodeTag.bitCount, DecodeTag.posCount); - - if (tracing && DecodeTag.len > 0) { + if (DecodeTag.len > 0) { LogTrace(DecodeTag.output, DecodeTag.len, 0, 0, NULL, false); } @@ -636,14 +652,32 @@ typedef struct DecodeReader { } DecodeReader_t; -static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader) +static void DecodeReaderInit(DecodeReader_t* DecodeReader, uint8_t *data, uint16_t max_len) +{ + DecodeReader->output = data; + DecodeReader->byteCountMax = max_len; + DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReader->byteCount = 0; + DecodeReader->bitCount = 0; + DecodeReader->posCount = 1; + DecodeReader->shiftReg = 0; +} + + +static void DecodeReaderReset(DecodeReader_t* DecodeReader) +{ + DecodeReader->state = STATE_READER_UNSYNCD; +} + + +static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uint8_t bit, DecodeReader_t *restrict DecodeReader) { switch(DecodeReader->state) { case STATE_READER_UNSYNCD: if(!bit) { // we went low, so this could be the beginning of a SOF - DecodeReader->state = STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF; DecodeReader->posCount = 1; + DecodeReader->state = STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF; } break; @@ -651,13 +685,13 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader DecodeReader->posCount++; if(bit) { // detected rising edge if(DecodeReader->posCount < 4) { // rising edge too early (nominally expected at 5) - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // SOF DecodeReader->state = STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF; } } else { if(DecodeReader->posCount > 5) { // stayed low for too long - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting } @@ -668,19 +702,19 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader DecodeReader->posCount++; if(!bit) { // detected a falling edge if (DecodeReader->posCount < 20) { // falling edge too early (nominally expected at 21 earliest) - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else if (DecodeReader->posCount < 23) { // SOF for 1 out of 4 coding DecodeReader->Coding = CODING_1_OUT_OF_4; DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; } else if (DecodeReader->posCount < 28) { // falling edge too early (nominally expected at 29 latest) - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // SOF for 1 out of 4 coding DecodeReader->Coding = CODING_1_OUT_OF_256; DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; } } else { if(DecodeReader->posCount > 29) { // stayed high for too long - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting } @@ -692,7 +726,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader if (bit) { // detected rising edge if (DecodeReader->Coding == CODING_1_OUT_OF_256) { if (DecodeReader->posCount < 32) { // rising edge too early (nominally expected at 33) - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { DecodeReader->posCount = 1; DecodeReader->bitCount = 0; @@ -703,7 +737,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader } } else { // CODING_1_OUT_OF_4 if (DecodeReader->posCount < 24) { // rising edge too early (nominally expected at 25) - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { DecodeReader->state = STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4; } @@ -711,13 +745,13 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader } else { if (DecodeReader->Coding == CODING_1_OUT_OF_256) { if (DecodeReader->posCount > 34) { // signal stayed low for too long - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting } } else { // CODING_1_OUT_OF_4 if (DecodeReader->posCount > 26) { // signal stayed low for too long - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting } @@ -739,7 +773,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader // do nothing, keep waiting } } else { // unexpected falling edge - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } break; @@ -761,7 +795,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader int corr11 = (DecodeReader->sum1 + DecodeReader->sum2) / 2; if (corr01 > corr11 && corr01 > corr10) { // EOF LED_B_OFF(); // Finished receiving - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); if (DecodeReader->byteCount != 0) { return true; } @@ -775,9 +809,10 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader if (DecodeReader->byteCount > DecodeReader->byteCountMax) { // buffer overflow, give up LED_B_OFF(); - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } DecodeReader->bitCount = 0; + DecodeReader->shiftReg = 0; } else { DecodeReader->bitCount++; } @@ -802,7 +837,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader int corr11 = (DecodeReader->sum1 + DecodeReader->sum2) / 2; if (corr01 > corr11 && corr01 > corr10) { // EOF LED_B_OFF(); // Finished receiving - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); if (DecodeReader->byteCount != 0) { return true; } @@ -815,7 +850,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader if (DecodeReader->byteCount > DecodeReader->byteCountMax) { // buffer overflow, give up LED_B_OFF(); - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } } DecodeReader->bitCount++; @@ -824,7 +859,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader default: LED_B_OFF(); - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); break; } @@ -832,18 +867,6 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader } -static void DecodeReaderInit(uint8_t *data, uint16_t max_len, DecodeReader_t* DecodeReader) -{ - DecodeReader->output = data; - DecodeReader->byteCountMax = max_len; - DecodeReader->state = STATE_READER_UNSYNCD; - DecodeReader->byteCount = 0; - DecodeReader->bitCount = 0; - DecodeReader->posCount = 0; - DecodeReader->shiftReg = 0; -} - - //----------------------------------------------------------------------------- // 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 @@ -856,16 +879,15 @@ static void DecodeReaderInit(uint8_t *data, uint16_t max_len, DecodeReader_t* De static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time) { - int maxBehindBy = 0; - int lastRxCounter, samples = 0; + int samples = 0; bool gotFrame = false; uint8_t b; - uint8_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; + uint8_t *dmaBuf = BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE); // the decoder data structure DecodeReader_t DecodeReader = {0}; - DecodeReaderInit(received, max_len, &DecodeReader); + DecodeReaderInit(&DecodeReader, received, max_len); // wait for last transfer to complete while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); @@ -883,21 +905,19 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 // Setup and start DMA. FpgaSetupSscDma(dmaBuf, ISO15693_DMA_BUFFER_SIZE); uint8_t *upTo = dmaBuf; - lastRxCounter = ISO15693_DMA_BUFFER_SIZE; for(;;) { - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO15693_DMA_BUFFER_SIZE-1); - if(behindBy > maxBehindBy) { - maxBehindBy = behindBy; - } + uint16_t behindBy = ((uint8_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); - if (behindBy < 1) continue; + if (behindBy == 0) continue; b = *upTo++; - lastRxCounter--; if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. upTo = dmaBuf; // start reading the circular buffer from the beginning - lastRxCounter += ISO15693_DMA_BUFFER_SIZE; + if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); + break; + } } if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and @@ -927,11 +947,12 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 FpgaDisableSscDma(); + BigBuf_free_keep_EM(); + + if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", + samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount); - if (DEBUG) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", - maxBehindBy, samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount); - - if (tracing && DecodeReader.byteCount > 0) { + if (DecodeReader.byteCount > 0) { LogTrace(DecodeReader.output, DecodeReader.byteCount, 0, 0, NULL, true); } @@ -939,7 +960,29 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 } -static void BuildIdentifyRequest(void); +// Encode (into the ToSend buffers) an identify request, which is the first +// thing that you must send to a tag to get a response. +static void BuildIdentifyRequest(void) +{ + uint8_t cmd[5]; + + uint16_t crc; + // one sub-carrier, inventory, 1 slot, fast rate + // AFI is at bit 5 (1<<4) when doing an INVENTORY + cmd[0] = (1 << 2) | (1 << 5) | (1 << 1); + // inventory command code + cmd[1] = 0x01; + // no mask + cmd[2] = 0x00; + //Now the CRC + crc = Crc(cmd, 3); + cmd[3] = crc & 0xff; + cmd[4] = crc >> 8; + + CodeIso15693AsReader(cmd, sizeof(cmd)); +} + + //----------------------------------------------------------------------------- // Start to read an ISO 15693 tag. We send an identify request, then wait // for the response. The response is not demodulated, just left in the buffer @@ -980,18 +1023,12 @@ void AcquireRawAdcSamplesIso15693(void) while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_AMPLITUDE); for(int c = 0; c < 4000; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - uint16_t iq = AT91C_BASE_SSC->SSC_RHR; - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates. We just want power, - // so abs(I) + abs(Q) is close to what we want. - int8_t i = (int8_t)(iq >> 8); - int8_t q = (int8_t)(iq & 0xff); - uint8_t r = AMPLITUDE(i, q); - dest[c++] = r; + uint16_t r = AT91C_BASE_SSC->SSC_RHR; + dest[c++] = r >> 5; } } @@ -1000,49 +1037,139 @@ void AcquireRawAdcSamplesIso15693(void) } -// TODO: there is no trigger condition. The 14000 samples represent a time frame of 66ms. -// It is unlikely that we get something meaningful. -// TODO: Currently we only record tag answers. Add tracing of reader commands. -// TODO: would we get something at all? The carrier is switched on... -void RecordRawAdcSamplesIso15693(void) +void SnoopIso15693(void) { - LEDsoff(); - LED_A_ON(); + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + BigBuf_free(); - uint8_t *dest = BigBuf_get_addr(); + clear_trace(); + set_tracing(true); - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - // Setup SSC - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - // Start from off (no field generated) - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); + // The DMA buffer, used to stream samples from the FPGA + uint16_t* dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); + uint16_t *upTo; + + // Count of samples received so far, so that we can include timing + // information in the trace buffer. + int samples = 0; + + DecodeTag_t DecodeTag = {0}; + uint8_t response[ISO15693_MAX_RESPONSE_LENGTH]; + DecodeTagInit(&DecodeTag, response, sizeof(response)); + DecodeReader_t DecodeReader = {0};; + uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; + DecodeReaderInit(&DecodeReader, cmd, sizeof(cmd)); + + // Print some debug information about the buffer sizes + if (DEBUG) { + Dbprintf("Snooping buffers initialized:"); + Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen()); + Dbprintf(" Reader -> tag: %i bytes", ISO15693_MAX_COMMAND_LENGTH); + Dbprintf(" tag -> Reader: %i bytes", ISO15693_MAX_RESPONSE_LENGTH); + Dbprintf(" DMA: %i bytes", ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t)); + } + Dbprintf("Snoop started. Press button to stop."); + + // Signal field is off, no reader signal, no tag signal + LEDsoff(); + // And put the FPGA in the appropriate mode + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_SNOOP | FPGA_HF_READER_RX_XCORR_AMPLITUDE); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - SpinDelay(100); + // Setup for the DMA. + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); - LED_D_ON(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + bool TagIsActive = false; + bool ReaderIsActive = false; + bool ExpectTagAnswer = false; - for(int c = 0; c < 14000;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - uint16_t iq = AT91C_BASE_SSC->SSC_RHR; - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates. We just want power, - // so abs(I) + abs(Q) is close to what we want. - int8_t i = (int8_t)(iq >> 8); - int8_t q = (int8_t)(iq & 0xff); - uint8_t r = AMPLITUDE(i, q); - dest[c++] = r; + // 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 == 0) continue; + + uint16_t snoopdata = *upTo++; + + if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning + if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d, samples=%d", behindBy, samples); + break; + } + if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and + AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers + WDT_HIT(); + if(BUTTON_PRESS()) { + DbpString("Snoop stopped."); + break; + } + } + } + samples++; + + if (!TagIsActive) { // no need to try decoding reader data if the tag is sending + if (Handle15693SampleFromReader(snoopdata & 0x02, &DecodeReader)) { + FpgaDisableSscDma(); + ExpectTagAnswer = true; + LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); + /* And ready to receive another command. */ + DecodeReaderReset(&DecodeReader); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DecodeTagReset(&DecodeTag); + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + } + if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) { + FpgaDisableSscDma(); + ExpectTagAnswer = true; + LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); + /* And ready to receive another command. */ + DecodeReaderReset(&DecodeReader); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DecodeTagReset(&DecodeTag); + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + } + ReaderIsActive = (DecodeReader.state >= STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF); } + + if (!ReaderIsActive && ExpectTagAnswer) { // no need to try decoding tag data if the reader is currently sending or no answer expected yet + if (Handle15693SamplesFromTag(snoopdata >> 2, &DecodeTag)) { + FpgaDisableSscDma(); + //Use samples as a time measurement + LogTrace(DecodeTag.output, DecodeTag.len, samples, samples, NULL, false); + // And ready to receive another response. + DecodeTagReset(&DecodeTag); + DecodeReaderReset(&DecodeReader); + ExpectTagAnswer = false; + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + } + TagIsActive = (DecodeTag.state >= STATE_TAG_RECEIVING_DATA); + } + } - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LED_D_OFF(); - Dbprintf("finished recording"); - LED_A_OFF(); + FpgaDisableSscDma(); + BigBuf_free(); + + LEDsoff(); + + DbpString("Snoop statistics:"); + Dbprintf(" ExpectTagAnswer: %d", ExpectTagAnswer); + Dbprintf(" DecodeTag State: %d", DecodeTag.state); + Dbprintf(" DecodeTag byteCnt: %d", DecodeTag.len); + Dbprintf(" DecodeReader State: %d", DecodeReader.state); + Dbprintf(" DecodeReader byteCnt: %d", DecodeReader.byteCount); + Dbprintf(" Trace length: %d", BigBuf_get_traceLen()); } @@ -1072,27 +1199,6 @@ static void Iso15693InitReader() { // This section basically contains transmission and receiving of bits /////////////////////////////////////////////////////////////////////// -// Encode (into the ToSend buffers) an identify request, which is the first -// thing that you must send to a tag to get a response. -static void BuildIdentifyRequest(void) -{ - uint8_t cmd[5]; - - uint16_t crc; - // one sub-carrier, inventory, 1 slot, fast rate - // AFI is at bit 5 (1<<4) when doing an INVENTORY - cmd[0] = (1 << 2) | (1 << 5) | (1 << 1); - // inventory command code - cmd[1] = 0x01; - // no mask - cmd[2] = 0x00; - //Now the CRC - crc = Crc(cmd, 3); - cmd[3] = crc & 0xff; - cmd[4] = crc >> 8; - - CodeIso15693AsReader(cmd, sizeof(cmd)); -} // uid is in transmission order (which is reverse of display order) static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) @@ -1100,12 +1206,11 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) uint8_t cmd[13]; uint16_t crc; - // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block - // followed by teh block data - // one sub-carrier, inventory, 1 slot, fast rate - cmd[0] = (1 << 6)| (1 << 5) | (1 << 1); // no SELECT bit, ADDR bit, OPTION bit + // If we set the Option_Flag in this request, the VICC will respond with the security status of the block + // followed by the block data + cmd[0] = ISO15693_REQ_OPTION | ISO15693_REQ_ADDRESS | ISO15693_REQ_DATARATE_HIGH; // READ BLOCK command code - cmd[1] = 0x20; + cmd[1] = ISO15693_READBLOCK; // UID may be optionally specified here // 64-bit UID cmd[2] = uid[0]; @@ -1117,7 +1222,7 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) cmd[8] = uid[6]; cmd[9] = uid[7]; // 0xe0; // always e0 (not exactly unique) // Block number to read - cmd[10] = blockNumber;//0x00; + cmd[10] = blockNumber; //Now the CRC crc = Crc(cmd, 11); // the crc needs to be calculated over 11 bytes cmd[11] = crc & 0xff; @@ -1156,10 +1261,9 @@ 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 return you a pointer to the received data -// If you do not need the answer use NULL for *recv[] +// *recv will contain the tag's answer // return: lenght of received data -int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv) { +int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t *recv, uint16_t max_recv_len, uint32_t start_time) { LED_A_ON(); LED_B_OFF(); @@ -1168,8 +1272,6 @@ int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv if (init) Iso15693InitReader(); int answerLen=0; - uint8_t *answer = BigBuf_get_addr() + 4000; - if (recv != NULL) memset(answer, 0, 100); if (!speed) { // low speed (1 out of 256) @@ -1179,11 +1281,11 @@ int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv CodeIso15693AsReader(send, sendlen); } - TransmitTo15693Tag(ToSend,ToSendMax); + TransmitTo15693Tag(ToSend, ToSendMax, start_time); + // Now wait for a response - if (recv!=NULL) { - answerLen = GetIso15693AnswerFromTag(answer, 100); - *recv=answer; + if (recv != NULL) { + answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, DELAY_ISO15693_VCD_TO_VICC * 2); } LED_A_OFF(); @@ -1202,46 +1304,46 @@ void DbdecodeIso15693Answer(int len, uint8_t *d) { char status[DBD15STATLEN+1]={0}; uint16_t crc; - if (len>3) { - if (d[0]&(1<<3)) - strncat(status,"ProtExt ",DBD15STATLEN); - if (d[0]&1) { + if (len > 3) { + if (d[0] & ISO15693_RES_EXT) + strncat(status,"ProtExt ", DBD15STATLEN); + if (d[0] & ISO15693_RES_ERROR) { // error - strncat(status,"Error ",DBD15STATLEN); + strncat(status,"Error ", DBD15STATLEN); switch (d[1]) { case 0x01: - strncat(status,"01:notSupp",DBD15STATLEN); + strncat(status,"01:notSupp", DBD15STATLEN); break; case 0x02: - strncat(status,"02:notRecog",DBD15STATLEN); + strncat(status,"02:notRecog", DBD15STATLEN); break; case 0x03: - strncat(status,"03:optNotSupp",DBD15STATLEN); + strncat(status,"03:optNotSupp", DBD15STATLEN); break; case 0x0f: - strncat(status,"0f:noInfo",DBD15STATLEN); + strncat(status,"0f:noInfo", DBD15STATLEN); break; case 0x10: - strncat(status,"10:dontExist",DBD15STATLEN); + strncat(status,"10:doesn'tExist", DBD15STATLEN); break; case 0x11: - strncat(status,"11:lockAgain",DBD15STATLEN); + strncat(status,"11:lockAgain", DBD15STATLEN); break; case 0x12: - strncat(status,"12:locked",DBD15STATLEN); + strncat(status,"12:locked", DBD15STATLEN); break; case 0x13: - strncat(status,"13:progErr",DBD15STATLEN); + strncat(status,"13:progErr", DBD15STATLEN); break; case 0x14: - strncat(status,"14:lockErr",DBD15STATLEN); + strncat(status,"14:lockErr", DBD15STATLEN); break; default: - strncat(status,"unknownErr",DBD15STATLEN); + strncat(status,"unknownErr", DBD15STATLEN); } - strncat(status," ",DBD15STATLEN); + strncat(status," ", DBD15STATLEN); } else { - strncat(status,"NoErr ",DBD15STATLEN); + strncat(status,"NoErr ", DBD15STATLEN); } crc=Crc(d,len-2); @@ -1266,6 +1368,7 @@ void SetDebugIso15693(uint32_t debug) { return; } + //----------------------------------------------------------------------------- // Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector // all demodulation performed in arm rather than host. - greg @@ -1275,13 +1378,14 @@ void ReaderIso15693(uint32_t parameter) LEDsoff(); LED_A_ON(); - int answerLen1 = 0; + set_tracing(true); + + int answerLen = 0; uint8_t TagUID[8] = {0x00}; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - uint8_t *answer1 = BigBuf_get_addr() + 4000; - memset(answer1, 0x00, 200); + uint8_t answer[ISO15693_MAX_RESPONSE_LENGTH]; SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Setup SSC @@ -1295,37 +1399,39 @@ void ReaderIso15693(uint32_t parameter) LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); SpinDelay(200); + StartCountSspClk(); + // FIRST WE RUN AN INVENTORY TO GET THE TAG UID // THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME // Now send the IDENTIFY command BuildIdentifyRequest(); - - TransmitTo15693Tag(ToSend,ToSendMax); + TransmitTo15693Tag(ToSend, ToSendMax, 0); // Now wait for a response - answerLen1 = GetIso15693AnswerFromTag(answer1, 100) ; + answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC * 2) ; + uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD; - if (answerLen1 >=12) // we should do a better check than this + if (answerLen >=12) // we should do a better check than this { - TagUID[0] = answer1[2]; - TagUID[1] = answer1[3]; - TagUID[2] = answer1[4]; - TagUID[3] = answer1[5]; - TagUID[4] = answer1[6]; - TagUID[5] = answer1[7]; - TagUID[6] = answer1[8]; // IC Manufacturer code - TagUID[7] = answer1[9]; // always E0 + TagUID[0] = answer[2]; + TagUID[1] = answer[3]; + TagUID[2] = answer[4]; + TagUID[3] = answer[5]; + TagUID[4] = answer[6]; + TagUID[5] = answer[7]; + TagUID[6] = answer[8]; // IC Manufacturer code + TagUID[7] = answer[9]; // always E0 } - Dbprintf("%d octets read from IDENTIFY request:", answerLen1); - DbdecodeIso15693Answer(answerLen1, answer1); - Dbhexdump(answerLen1, answer1, false); + Dbprintf("%d octets read from IDENTIFY request:", answerLen); + DbdecodeIso15693Answer(answerLen, answer); + Dbhexdump(answerLen, answer, false); // UID is reverse - if (answerLen1 >= 12) + if (answerLen >= 12) Dbprintf("UID = %02hX%02hX%02hX%02hX%02hX%02hX%02hX%02hX", TagUID[7],TagUID[6],TagUID[5],TagUID[4], TagUID[3],TagUID[2],TagUID[1],TagUID[0]); @@ -1340,18 +1446,21 @@ void ReaderIso15693(uint32_t parameter) // Dbhexdump(answerLen3,answer3,true); // read all pages - if (answerLen1 >= 12 && DEBUG) { - uint8_t *answer2 = BigBuf_get_addr() + 4100; + if (answerLen >= 12 && DEBUG) { + + // debugptr = BigBuf_get_addr(); + int i = 0; while (i < 32) { // sanity check, assume max 32 pages BuildReadBlockRequest(TagUID, i); - TransmitTo15693Tag(ToSend, ToSendMax); - int answerLen2 = GetIso15693AnswerFromTag(answer2, 100); - if (answerLen2 > 0) { - Dbprintf("READ SINGLE BLOCK %d returned %d octets:", i, answerLen2); - DbdecodeIso15693Answer(answerLen2, answer2); - Dbhexdump(answerLen2, answer2, false); - if ( *((uint32_t*) answer2) == 0x07160101 ) break; // exit on NoPageErr + TransmitTo15693Tag(ToSend, ToSendMax, start_time); + int answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC * 2); + start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD; + if (answerLen > 0) { + Dbprintf("READ SINGLE BLOCK %d returned %d octets:", i, answerLen); + DbdecodeIso15693Answer(answerLen, answer); + Dbhexdump(answerLen, answer, false); + if ( *((uint32_t*) answer) == 0x07160101 ) break; // exit on NoPageErr } i++; } @@ -1412,12 +1521,14 @@ void BruteforceIso15693Afi(uint32_t speed) LEDsoff(); LED_A_ON(); - uint8_t data[20]; - uint8_t *recv=data; + uint8_t data[6]; + uint8_t recv[ISO15693_MAX_RESPONSE_LENGTH]; + int datalen=0, recvlen=0; Iso15693InitReader(); - + StartCountSspClk(); + // first without AFI // Tags should respond without AFI and with AFI=0 even when AFI is active @@ -1425,10 +1536,11 @@ void BruteforceIso15693Afi(uint32_t speed) data[1] = ISO15693_INVENTORY; data[2] = 0; // mask length datalen = AddCrc(data,3); - recvlen = SendDataTag(data, datalen, false, speed, &recv); + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), 0); + uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VCD_TO_VICC; WDT_HIT(); if (recvlen>=12) { - Dbprintf("NoAFI UID=%s",sprintUID(NULL,&recv[2])); + Dbprintf("NoAFI UID=%s", sprintUID(NULL, &recv[2])); } // now with AFI @@ -1438,13 +1550,14 @@ void BruteforceIso15693Afi(uint32_t speed) data[2] = 0; // AFI data[3] = 0; // mask length - for (int i=0;i<256;i++) { - data[2]=i & 0xFF; - datalen=AddCrc(data,4); - recvlen=SendDataTag(data, datalen, false, speed, &recv); + for (int i = 0; i < 256; i++) { + data[2] = i & 0xFF; + datalen = AddCrc(data,4); + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time); + start_time = GetCountSspClk() + DELAY_ISO15693_VCD_TO_VICC; WDT_HIT(); - if (recvlen>=12) { - Dbprintf("AFI=%i UID=%s", i, sprintUID(NULL,&recv[2])); + if (recvlen >= 12) { + Dbprintf("AFI=%i UID=%s", i, sprintUID(NULL, &recv[2])); } } Dbprintf("AFI Bruteforcing done."); @@ -1456,26 +1569,27 @@ void BruteforceIso15693Afi(uint32_t speed) // Allows to directly send commands to the tag via the client void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint8_t data[]) { - int recvlen=0; - uint8_t *recvbuf = BigBuf_get_addr(); + int recvlen = 0; + uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; LED_A_ON(); if (DEBUG) { - Dbprintf("SEND"); + Dbprintf("SEND:"); Dbhexdump(datalen, data, false); } - recvlen = SendDataTag(data, datalen, true, speed, (recv?&recvbuf:NULL)); + recvlen = SendDataTag(data, datalen, true, speed, (recv?recvbuf:NULL), sizeof(recvbuf), 0); if (recv) { - cmd_send(CMD_ACK, recvlen>48?48:recvlen, 0, 0, recvbuf, 48); - if (DEBUG) { - Dbprintf("RECV"); - DbdecodeIso15693Answer(recvlen,recvbuf); + Dbprintf("RECV:"); Dbhexdump(recvlen, recvbuf, false); + DbdecodeIso15693Answer(recvlen, recvbuf); } + + cmd_send(CMD_ACK, recvlen>ISO15693_MAX_RESPONSE_LENGTH?ISO15693_MAX_RESPONSE_LENGTH:recvlen, 0, 0, recvbuf, ISO15693_MAX_RESPONSE_LENGTH); + } // for the time being, switch field off to protect rdv4.0