X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/463871be6e6e2a23c8a7391aac47fa1048d5ca11..666fa6e1cfdc81acd1525ff4153c077535aa205a:/armsrc/iso15693.c?ds=sidebyside diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c index e7145c5c..9b0ab29e 100644 --- a/armsrc/iso15693.c +++ b/armsrc/iso15693.c @@ -67,6 +67,8 @@ #define arraylen(x) (sizeof(x)/sizeof((x)[0])) +static int DEBUG = 0; + /////////////////////////////////////////////////////////////////////// // ISO 15693 Part 2 - Air Interface // This section basicly contains transmission and receiving of bits @@ -81,8 +83,11 @@ #define AddCrc(data,datalen) Iso15693AddCrc(data,datalen) #define sprintUID(target,uid) Iso15693sprintUID(target,uid) -int DEBUG=0; +// approximate amplitude=sqrt(ci^2+cq^2) +#define AMPLITUDE(ci, cq) (MAX(ABS(ci), ABS(cq)) + MIN(ABS(ci), ABS(cq))/2) +// DMA buffer +#define ISO15693_DMA_BUFFER_SIZE 128 // --------------------------- // Signal Processing @@ -165,13 +170,15 @@ static void CodeIso15693AsReader(uint8_t *cmd, int n) ToSendStuffBit(0); ToSendStuffBit(1); - // And slack at the end, too. - for(i = 0; i < 24; i++) { + // Fill remainder of last byte with 1 + for(i = 0; i < 4; i++) { ToSendStuffBit(1); } + + ToSendMax++; } -// encode data using "1 out of 256" sheme +// 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) @@ -219,280 +226,349 @@ static void CodeIso15693AsReader256(uint8_t *cmd, int n) } -// Transmit the command (to the tag) that was placed in ToSend[]. -static void TransmitTo15693Tag(const uint8_t *cmd, int len, int *samples, int *wait) +// Transmit the command (to the tag) that was placed in cmd[]. +static void TransmitTo15693Tag(const uint8_t *cmd, int len) { - int c; - -// FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); - if(*wait < 10) { *wait = 10; } - -// for(c = 0; c < *wait;) { -// if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { -// AT91C_BASE_SSC->SSC_THR = 0x00; // For exact timing! -// c++; -// } -// if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { -// volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; -// (void)r; -// } -// WDT_HIT(); -// } - - c = 0; - for(;;) { + + LED_B_ON(); + for(int c = 0; c < len; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = cmd[c]; + AT91C_BASE_SSC->SSC_THR = ~cmd[c]; c++; - if(c >= len) { - break; - } - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; - (void)r; } WDT_HIT(); } - *samples = (c + *wait) << 3; + LED_B_OFF(); } //----------------------------------------------------------------------------- -// Transmit the command (to the reader) that was placed in ToSend[]. +// Transmit the command (to the reader) that was placed in cmd[]. //----------------------------------------------------------------------------- -static void TransmitTo15693Reader(const uint8_t *cmd, int len, int *samples, int *wait) +static void TransmitTo15693Reader(const uint8_t *cmd, int len) { - int c = 0; - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K); - if(*wait < 10) { *wait = 10; } + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K); - for(;;) { + LED_C_ON(); + for(int c = 0; c < len; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { AT91C_BASE_SSC->SSC_THR = cmd[c]; c++; - if(c >= len) { - break; - } - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; - (void)r; } WDT_HIT(); } - *samples = (c + *wait) << 3; + LED_C_OFF(); } -// Read from Tag -// Parameters: -// receivedResponse -// maxLen -// samples -// elapsed -// returns: -// number of decoded bytes -static int GetIso15693AnswerFromTag(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) +//============================================================================= +// An ISO 15693 demodulator (one subcarrier only). Uses cross correlation to +// identify the SOF, each bit, and EOF. +// This function is called 8 times per bit (every 2 subcarrier cycles). +// Subcarrier frequency fs is 424kHz, 1/fs = 2,36us, +// i.e. function is called every 4,72us +// LED handling: +// LED C -> ON once we have received the SOF and are expecting the rest. +// LED C -> OFF once we have received EOF or are unsynced +// +// Returns: true if we received a EOF +// false if we are still waiting for some more +//============================================================================= + +#define SUBCARRIER_DETECT_THRESHOLD 2 +#define SOF_CORRELATOR_LEN (1<<5) + +typedef struct Demod { + enum { + DEMOD_UNSYNCD, + DEMOD_AWAIT_SOF_1, + DEMOD_AWAIT_SOF_2, + DEMOD_RECEIVING_DATA, + DEMOD_AWAIT_EOF + } state; + int bitCount; + int posCount; + enum { + LOGIC0, + LOGIC1, + SOF_PART1, + SOF_PART2 + } lastBit; + uint16_t shiftReg; + uint8_t *output; + int len; + int sum1, sum2; + uint8_t SOF_low; + uint8_t SOF_high; + uint8_t SOF_last; + int32_t SOF_corr; + int32_t SOF_corr_prev; + uint8_t SOF_correlator[SOF_CORRELATOR_LEN]; +} Demod_t; + +static RAMFUNC int Handle15693SamplesDemod(int8_t ci, int8_t cq, Demod_t *Demod) { - int c = 0; - uint8_t *dest = BigBuf_get_addr(); - int getNext = 0; - - int8_t prev = 0; + switch(Demod->state) { + case DEMOD_UNSYNCD: + // initialize SOF correlator. We are looking for 12 samples low and 12 samples high. + Demod->SOF_low = 0; + Demod->SOF_high = 12; + Demod->SOF_last = 23; + memset(Demod->SOF_correlator, 0x00, Demod->SOF_last + 1); + Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq); + Demod->SOF_corr = Demod->SOF_correlator[Demod->SOF_last]; + Demod->SOF_corr_prev = Demod->SOF_corr; + // initialize Demodulator + Demod->posCount = 0; + Demod->bitCount = 0; + Demod->len = 0; + Demod->state = DEMOD_AWAIT_SOF_1; + break; + + case DEMOD_AWAIT_SOF_1: + // calculate the correlation in real time. Look at differences only. + Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_low++]; + Demod->SOF_corr -= 2*Demod->SOF_correlator[Demod->SOF_high++]; + Demod->SOF_last++; + Demod->SOF_low &= (SOF_CORRELATOR_LEN-1); + Demod->SOF_high &= (SOF_CORRELATOR_LEN-1); + Demod->SOF_last &= (SOF_CORRELATOR_LEN-1); + Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq); + Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_last]; + + // if correlation increases for 10 consecutive samples, we are close to maximum correlation + if (Demod->SOF_corr > Demod->SOF_corr_prev + SUBCARRIER_DETECT_THRESHOLD) { + Demod->posCount++; + } else { + Demod->posCount = 0; + } -// NOW READ RESPONSE - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - //spindelay(60); // greg - experiment to get rid of some of the 0 byte/failed reads - c = 0; - getNext = FALSE; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x43; - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - int8_t b; - b = (int8_t)AT91C_BASE_SSC->SSC_RHR; + if (Demod->posCount == 10) { // correlation increased 10 times + Demod->state = DEMOD_AWAIT_SOF_2; + } + + Demod->SOF_corr_prev = Demod->SOF_corr; + + break; + + case DEMOD_AWAIT_SOF_2: + // calculate the correlation in real time. Look at differences only. + Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_low++]; + Demod->SOF_corr -= 2*Demod->SOF_correlator[Demod->SOF_high++]; + Demod->SOF_last++; + Demod->SOF_low &= (SOF_CORRELATOR_LEN-1); + Demod->SOF_high &= (SOF_CORRELATOR_LEN-1); + Demod->SOF_last &= (SOF_CORRELATOR_LEN-1); + Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq); + Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_last]; + + if (Demod->SOF_corr >= Demod->SOF_corr_prev) { // we are looking for the maximum correlation + Demod->SOF_corr_prev = Demod->SOF_corr; + } else { + Demod->lastBit = SOF_PART1; // detected 1st part of SOF + Demod->sum1 = Demod->SOF_correlator[Demod->SOF_last]; + Demod->sum2 = 0; + Demod->posCount = 2; + Demod->state = DEMOD_RECEIVING_DATA; + LED_C_ON(); + } + + break; - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates, so every other sample is I, - // every other is Q. We just want power, so abs(I) + abs(Q) is - // close to what we want. - if(getNext) { - int8_t r; - - if(b < 0) { - r = -b; - } else { - r = b; - } - if(prev < 0) { - r -= prev; - } else { - r += prev; - } + case DEMOD_RECEIVING_DATA: + if (Demod->posCount == 1) { + Demod->sum1 = 0; + Demod->sum2 = 0; + } - dest[c++] = (uint8_t)r; + if (Demod->posCount <= 4) { + Demod->sum1 += AMPLITUDE(ci, cq); + } else { + Demod->sum2 += AMPLITUDE(ci, cq); + } - if(c >= 2000) { - break; + if (Demod->posCount == 8) { + int16_t corr_1 = (Demod->sum2 - Demod->sum1) / 4; + int16_t corr_0 = (Demod->sum1 - Demod->sum2) / 4; + int16_t corr_EOF = (Demod->sum1 + Demod->sum2) / 8; + if (corr_EOF > corr_0 && corr_EOF > corr_1) { + Demod->state = DEMOD_AWAIT_EOF; + } else if (corr_1 > corr_0) { + // logic 1 + if (Demod->lastBit == SOF_PART1) { // still part of SOF + Demod->lastBit = SOF_PART2; + } else { + Demod->lastBit = LOGIC1; + Demod->shiftReg >>= 1; + Demod->shiftReg |= 0x80; + Demod->bitCount++; + if (Demod->bitCount == 8) { + Demod->output[Demod->len] = Demod->shiftReg; + Demod->len++; + Demod->bitCount = 0; + Demod->shiftReg = 0; + } + } + } else { + // logic 0 + if (Demod->lastBit == SOF_PART1) { // incomplete SOF + Demod->state = DEMOD_UNSYNCD; + LED_C_OFF(); + } else { + Demod->lastBit = LOGIC0; + Demod->shiftReg >>= 1; + Demod->bitCount++; + if (Demod->bitCount == 8) { + Demod->output[Demod->len] = Demod->shiftReg; + Demod->len++; + Demod->bitCount = 0; + Demod->shiftReg = 0; + } + } } + Demod->posCount = 0; + } + Demod->posCount++; + break; + + case DEMOD_AWAIT_EOF: + if (Demod->lastBit == LOGIC0) { // this was already part of EOF + LED_C_OFF(); + return true; } else { - prev = b; + Demod->state = DEMOD_UNSYNCD; + LED_C_OFF(); } + break; - getNext = !getNext; - } + default: + Demod->state = DEMOD_UNSYNCD; + LED_C_OFF(); + break; } - ////////////////////////////////////////// - /////////// DEMODULATE /////////////////// - ////////////////////////////////////////// - - int i, j; - int max = 0, maxPos=0; + return false; +} - int skip = 4; - // if(GraphTraceLen < 1000) return; // THIS CHECKS FOR A BUFFER TO SMALL +static void DemodInit(Demod_t* Demod, uint8_t* data) +{ + Demod->output = data; + Demod->state = DEMOD_UNSYNCD; +} - // First, correlate for SOF - for(i = 0; i < 100; i++) { - int corr = 0; - for(j = 0; j < arraylen(FrameSOF); j += skip) { - corr += FrameSOF[j]*dest[i+(j/skip)]; - } - if(corr > max) { - max = corr; - maxPos = i; - } - } - // DbpString("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip)); - int k = 0; // this will be our return value +/* + * Demodulate the samples we received from the tag, also log to tracebuffer + */ +static int GetIso15693AnswerFromTag(uint8_t* response, int timeout) +{ + int maxBehindBy = 0; + int lastRxCounter, samples = 0; + int8_t ci, cq; + bool gotFrame = false; + + // Allocate memory from BigBuf for some buffers + // free all previous allocations first + BigBuf_free(); - // greg - If correlation is less than 1 then there's little point in continuing - if ((max/(arraylen(FrameSOF)/skip)) >= 1) - { + // The DMA buffer, used to stream samples from the FPGA + uint16_t* dmaBuf = (uint16_t*) BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t)); - i = maxPos + arraylen(FrameSOF)/skip; - - uint8_t outBuf[20]; - memset(outBuf, 0, sizeof(outBuf)); - uint8_t mask = 0x01; - for(;;) { - int corr0 = 0, corr1 = 0, corrEOF = 0; - for(j = 0; j < arraylen(Logic0); j += skip) { - corr0 += Logic0[j]*dest[i+(j/skip)]; - } - for(j = 0; j < arraylen(Logic1); j += skip) { - corr1 += Logic1[j]*dest[i+(j/skip)]; - } - for(j = 0; j < arraylen(FrameEOF); j += skip) { - corrEOF += FrameEOF[j]*dest[i+(j/skip)]; - } - // Even things out by the length of the target waveform. - corr0 *= 4; - corr1 *= 4; + // the Demodulatur data structure + Demod_t* Demod = (Demod_t*) BigBuf_malloc(sizeof(Demod_t)); - if(corrEOF > corr1 && corrEOF > corr0) { - // DbpString("EOF at %d", i); - break; - } else if(corr1 > corr0) { - i += arraylen(Logic1)/skip; - outBuf[k] |= mask; - } else { - i += arraylen(Logic0)/skip; - } - mask <<= 1; - if(mask == 0) { - k++; - mask = 0x01; - } - if((i+(int)arraylen(FrameEOF)) >= 2000) { - DbpString("ran off end!"); - break; - } + // Set up the demodulator for tag -> reader responses. + DemodInit(Demod, response); + + // 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); + + // 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; } - if(mask != 0x01) { // this happens, when we miss the EOF - // TODO: for some reason this happens quite often - if (DEBUG) Dbprintf("error, uneven octet! (extra bits!) mask=%02x", mask); - if (mask<0x08) k--; // discard the last uneven octet; - // 0x08 is an assumption - but works quite often + + if (behindBy < 1) continue; + + ci = (int8_t)(*upTo >> 8); + cq = (int8_t)(*upTo & 0xff); + + 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; } - // uint8_t str1 [8]; - // itoa(k,str1); - // strncat(str1," octets read",8); - - // DbpString( str1); // DbpString("%d octets", k); - - // for(i = 0; i < k; i+=3) { - // //DbpString("# %2d: %02x ", i, outBuf[i]); - // DbpIntegers(outBuf[i],outBuf[i+1],outBuf[i+2]); - // } - - for(i = 0; i < k; i++) { - receivedResponse[i] = outBuf[i]; + if (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 } - } // "end if correlation > 0" (max/(arraylen(FrameSOF)/skip)) - return k; // return the number of bytes demodulated + samples++; -/// DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2)); + if (Handle15693SamplesDemod(ci, cq, Demod)) { + gotFrame = true; + break; + } + if(samples > timeout && Demod->state < DEMOD_RECEIVING_DATA) { + Demod->len = 0; + break; + } + } + + FpgaDisableSscDma(); + + if (DEBUG) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.state = %d, Demod.len = %d, Demod.bitCount = %d, Demod.posCount = %d", + maxBehindBy, samples, gotFrame, Demod->state, Demod->len, Demod->bitCount, Demod->posCount); + + if (tracing && Demod->len > 0) { + uint8_t parity[MAX_PARITY_SIZE]; + LogTrace(Demod->output, Demod->len, 0, 0, parity, false); + } + + return Demod->len; } // Now the GetISO15693 message from sniffing command +// TODO: fix it. This cannot work for several reasons: +// 1. Carrier is switched on during sniffing? +// 2. We most probable miss the next reader command when demodulating static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) { - int c = 0; uint8_t *dest = BigBuf_get_addr(); - int getNext = 0; - - int8_t prev = 0; // NOW READ RESPONSE + LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); //spindelay(60); // greg - experiment to get rid of some of the 0 byte/failed reads - c = 0; - getNext = FALSE; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x43; - } + for(int c = 0; c < BIGBUF_SIZE; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - int8_t b = (int8_t)AT91C_BASE_SSC->SSC_RHR; - + 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, so every other sample is I, - // every other is Q. We just want power, so abs(I) + abs(Q) is - // close to what we want. - if(getNext) { - int8_t r; - - if(b < 0) { - r = -b; - } else { - r = b; - } - if(prev < 0) { - r -= prev; - } else { - r += prev; - } - - dest[c++] = (uint8_t)r; - - if(c >= 20000) { - break; - } - } else { - prev = b; - } - - getNext = !getNext; + // tone that the tag AM-modulates. We just want power, + // so abs(I) + abs(Q) is close to what we want. + int8_t i = (int8_t)(iq >> 8); + int8_t q = (int8_t)(iq & 0xff); + uint8_t r = AMPLITUDE(i, q); + dest[c++] = r; } } + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); ////////////////////////////////////////// /////////// DEMODULATE /////////////////// @@ -501,12 +577,10 @@ static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int int i, j; int max = 0, maxPos=0; - int skip = 4; - -// if(GraphTraceLen < 1000) return; // THIS CHECKS FOR A BUFFER TO SMALL + int skip = 2; // First, correlate for SOF - for(i = 0; i < 19000; i++) { + for(i = 0; i < 38000; i++) { int corr = 0; for(j = 0; j < arraylen(FrameSOF); j += skip) { corr += FrameSOF[j]*dest[i+(j/skip)]; @@ -516,7 +590,8 @@ static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int maxPos = i; } } -// DbpString("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip)); + + if (DEBUG) Dbprintf("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip)); int k = 0; // this will be our return value @@ -530,10 +605,15 @@ static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int memset(outBuf, 0, sizeof(outBuf)); uint8_t mask = 0x01; for(;;) { - int corr0 = 0, corr1 = 0, corrEOF = 0; + int corr0 = 0, corr00 = 0, corr01 = 0, corr1 = 0, corrEOF = 0; for(j = 0; j < arraylen(Logic0); j += skip) { corr0 += Logic0[j]*dest[i+(j/skip)]; } + corr01 = corr00 = corr0; + for(j = 0; j < arraylen(Logic0); j += skip) { + corr00 += Logic0[j]*dest[i+arraylen(Logic0)/skip+(j/skip)]; + corr01 += Logic1[j]*dest[i+arraylen(Logic0)/skip+(j/skip)]; + } for(j = 0; j < arraylen(Logic1); j += skip) { corr1 += Logic1[j]*dest[i+(j/skip)]; } @@ -541,11 +621,14 @@ static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int corrEOF += FrameEOF[j]*dest[i+(j/skip)]; } // Even things out by the length of the target waveform. + corr00 *= 2; + corr01 *= 2; corr0 *= 4; corr1 *= 4; - if(corrEOF > corr1 && corrEOF > corr0) { - // DbpString("EOF at %d", i); + if(corrEOF > corr1 && corrEOF > corr00 && corrEOF > corr01) { + if (DEBUG) Dbprintf("EOF at %d, correlation %d (corr01: %d, corr00: %d, corr1: %d, corr0: %d)", + i, corrEOF, corr01, corr00, corr1, corr0); break; } else if(corr1 > corr0) { i += arraylen(Logic1)/skip; @@ -558,7 +641,7 @@ static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int k++; mask = 0x01; } - if((i+(int)arraylen(FrameEOF)) >= 2000) { + if((i+(int)arraylen(FrameEOF)/skip) >= BIGBUF_SIZE) { DbpString("ran off end!"); break; } @@ -596,185 +679,129 @@ static void BuildIdentifyRequest(void); //----------------------------------------------------------------------------- void AcquireRawAdcSamplesIso15693(void) { + LEDsoff(); + LED_A_ON(); + uint8_t *dest = BigBuf_get_addr(); - int c = 0; - int getNext = 0; - int8_t prev = 0; - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); BuildIdentifyRequest(); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Give the tags time to energize + LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); SpinDelay(100); // Now send the command - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); - c = 0; - for(;;) { + LED_B_ON(); + for(int c = 0; c < ToSendMax; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = ToSend[c]; + AT91C_BASE_SSC->SSC_THR = ~ToSend[c]; c++; - if(c == ToSendMax+3) { - break; - } - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; - (void)r; } WDT_HIT(); } + LED_B_OFF(); + // wait for last transfer to complete + while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); + + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - c = 0; - getNext = FALSE; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x43; - } + for(int c = 0; c < 4000; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - int8_t b; - b = (int8_t)AT91C_BASE_SSC->SSC_RHR; - + 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, so every other sample is I, - // every other is Q. We just want power, so abs(I) + abs(Q) is - // close to what we want. - if(getNext) { - int8_t r; - - if(b < 0) { - r = -b; - } else { - r = b; - } - if(prev < 0) { - r -= prev; - } else { - r += prev; - } - - dest[c++] = (uint8_t)r; - - if(c >= 2000) { - break; - } - } else { - prev = b; - } - - getNext = !getNext; + // tone that the tag AM-modulates. We just want power, + // so abs(I) + abs(Q) is close to what we want. + int8_t i = (int8_t)(iq >> 8); + int8_t q = (int8_t)(iq & 0xff); + uint8_t r = AMPLITUDE(i, q); + dest[c++] = r; } } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); } +// 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) { + LEDsoff(); + LED_A_ON(); + uint8_t *dest = BigBuf_get_addr(); - int c = 0; - int getNext = 0; - int8_t prev = 0; - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); // Setup SSC - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); // Start from off (no field generated) - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + SpinDelay(200); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); SpinDelay(100); + LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - c = 0; - getNext = FALSE; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x43; - } + for(int c = 0; c < 14000;) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - int8_t b; - b = (int8_t)AT91C_BASE_SSC->SSC_RHR; - + 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, so every other sample is I, - // every other is Q. We just want power, so abs(I) + abs(Q) is - // close to what we want. - if(getNext) { - int8_t r; - - if(b < 0) { - r = -b; - } else { - r = b; - } - if(prev < 0) { - r -= prev; - } else { - r += prev; - } - - dest[c++] = (uint8_t)r; - - if(c >= 7000) { - break; - } - } else { - prev = b; - } - - getNext = !getNext; - WDT_HIT(); + // 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; } } - Dbprintf("fin record"); + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + Dbprintf("finished recording"); + LED_A_OFF(); } // Initialize the proxmark as iso15k reader // (this might produces glitches that confuse some tags -void Iso15693InitReader() { - LED_A_ON(); - LED_B_ON(); - LED_C_OFF(); - LED_D_OFF(); - +static void Iso15693InitReader() { FpgaDownloadAndGo(FPGA_BITSTREAM_HF); // Setup SSC // FpgaSetupSsc(); // Start from off (no field generated) + LED_D_OFF(); FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); SpinDelay(10); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); // Give the tags time to energize + LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); SpinDelay(250); - - LED_A_ON(); - LED_B_OFF(); - LED_C_OFF(); - LED_D_OFF(); } /////////////////////////////////////////////////////////////////////// // ISO 15693 Part 3 - Air Interface -// This section basicly contains transmission and receiving of bits +// This section basically contains transmission and receiving of bits /////////////////////////////////////////////////////////////////////// // Encode (into the ToSend buffers) an identify request, which is the first @@ -831,8 +858,9 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) 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]; @@ -865,22 +893,16 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) // **recv will return you a pointer to the received data // If you do not need the answer use NULL for *recv[] // return: lenght of received data -int SendDataTag(uint8_t *send, int sendlen, int init, int speed, uint8_t **recv) { +int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv) { - int samples = 0; - int tsamples = 0; - int wait = 0; - int elapsed = 0; - LED_A_ON(); - LED_B_ON(); + LED_B_OFF(); LED_C_OFF(); - LED_D_OFF(); if (init) Iso15693InitReader(); int answerLen=0; - uint8_t *answer = BigBuf_get_addr() + 3660; + uint8_t *answer = BigBuf_get_addr() + 4000; if (recv != NULL) memset(answer, 0, 100); if (!speed) { @@ -891,22 +913,14 @@ int SendDataTag(uint8_t *send, int sendlen, int init, int speed, uint8_t **recv) CodeIso15693AsReader(send, sendlen); } - LED_A_ON(); - LED_B_OFF(); - - TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait); + TransmitTo15693Tag(ToSend,ToSendMax); // Now wait for a response if (recv!=NULL) { - LED_A_OFF(); - LED_B_ON(); - answerLen = GetIso15693AnswerFromTag(answer, 100, &samples, &elapsed) ; + answerLen = GetIso15693AnswerFromTag(answer, 100); *recv=answer; } LED_A_OFF(); - LED_B_OFF(); - LED_C_OFF(); - LED_D_OFF(); return answerLen; } @@ -986,64 +1000,46 @@ 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 //----------------------------------------------------------------------------- void ReaderIso15693(uint32_t parameter) { + LEDsoff(); LED_A_ON(); - LED_B_ON(); - LED_C_OFF(); - LED_D_OFF(); int answerLen1 = 0; - int answerLen2 = 0; - int answerLen3 = 0; - int i = 0; - int samples = 0; - int tsamples = 0; - int wait = 0; - int elapsed = 0; uint8_t TagUID[8] = {0x00}; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - uint8_t *answer1 = BigBuf_get_addr() + 3660; - uint8_t *answer2 = BigBuf_get_addr() + 3760; - uint8_t *answer3 = BigBuf_get_addr() + 3860; - // Blank arrays - memset(answer1, 0x00, 300); + uint8_t *answer1 = BigBuf_get_addr() + 4000; + memset(answer1, 0x00, 200); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Setup SSC - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); // 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_RX_XCORR); SpinDelay(200); - LED_A_ON(); - LED_B_OFF(); - LED_C_OFF(); - LED_D_OFF(); - // FIRST WE RUN AN INVENTORY TO GET THE TAG UID // THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME // Now send the IDENTIFY command BuildIdentifyRequest(); - TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait); + TransmitTo15693Tag(ToSend,ToSendMax); // Now wait for a response - answerLen1 = GetIso15693AnswerFromTag(answer1, 100, &samples, &elapsed) ; + answerLen1 = GetIso15693AnswerFromTag(answer1, 100) ; if (answerLen1 >=12) // we should do a better check than this { @@ -1063,27 +1059,28 @@ void ReaderIso15693(uint32_t parameter) Dbhexdump(answerLen1,answer1,true); // UID is reverse - if (answerLen1>=12) + if (answerLen1 >= 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]); - Dbprintf("%d octets read from SELECT request:", answerLen2); - DbdecodeIso15693Answer(answerLen2,answer2); - Dbhexdump(answerLen2,answer2,true); + // 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); + // Dbprintf("%d octets read from XXX request:", answerLen3); + // DbdecodeIso15693Answer(answerLen3,answer3); + // Dbhexdump(answerLen3,answer3,true); // read all pages - if (answerLen1>=12 && DEBUG) { - i=0; + if (answerLen1 >= 12 && DEBUG) { + uint8_t *answer2 = BigBuf_get_addr() + 4100; + int i=0; while (i<32) { // sanity check, assume max 32 pages BuildReadBlockRequest(TagUID,i); - TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait); - answerLen2 = GetIso15693AnswerFromTag(answer2, 100, &samples, &elapsed); + TransmitTo15693Tag(ToSend,ToSendMax); + int answerLen2 = GetIso15693AnswerFromTag(answer2, 100); if (answerLen2>0) { Dbprintf("READ SINGLE BLOCK %d returned %d octets:",i,answerLen2); DbdecodeIso15693Answer(answerLen2,answer2); @@ -1094,44 +1091,37 @@ void ReaderIso15693(uint32_t parameter) } } - LED_A_OFF(); - LED_B_OFF(); - LED_C_OFF(); + // for the time being, switch field off to protect rdv4.0 + // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); + + LED_A_OFF(); } // Simulate an ISO15693 TAG, perform anti-collision and then print any reader commands // all demodulation performed in arm rather than host. - greg void SimTagIso15693(uint32_t parameter, uint8_t *uid) { + LEDsoff(); LED_A_ON(); - LED_B_ON(); - LED_C_OFF(); - LED_D_OFF(); int answerLen1 = 0; int samples = 0; - int tsamples = 0; - int wait = 0; int elapsed = 0; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - uint8_t *buf = BigBuf_get_addr() + 3660; + uint8_t *buf = BigBuf_get_addr() + 4000; memset(buf, 0x00, 100); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); // Start from off (no field generated) FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); SpinDelay(200); - LED_A_OFF(); - LED_B_OFF(); - LED_C_ON(); - LED_D_OFF(); - // Listen to reader answerLen1 = GetIso15693AnswerFromSniff(buf, 100, &samples, &elapsed) ; @@ -1142,7 +1132,7 @@ void SimTagIso15693(uint32_t parameter, uint8_t *uid) BuildInventoryResponse(uid); - TransmitTo15693Reader(ToSend,ToSendMax, &tsamples, &wait); + TransmitTo15693Reader(ToSend,ToSendMax); } Dbprintf("%d octets read from reader command: %x %x %x %x %x %x %x %x %x", answerLen1, @@ -1153,10 +1143,7 @@ void SimTagIso15693(uint32_t parameter, uint8_t *uid) uid[0], uid[1], uid[2], uid[3], uid[4], uid[5], uid[6], uid[7]); - LED_A_OFF(); - LED_B_OFF(); - LED_C_OFF(); - LED_D_OFF(); + LEDsoff(); } @@ -1164,6 +1151,9 @@ void SimTagIso15693(uint32_t parameter, uint8_t *uid) // (some manufactures offer a way to read the AFI, though) void BruteforceIso15693Afi(uint32_t speed) { + LEDsoff(); + LED_A_ON(); + uint8_t data[20]; uint8_t *recv=data; int datalen=0, recvlen=0; @@ -1178,7 +1168,7 @@ void BruteforceIso15693Afi(uint32_t speed) data[1]=ISO15_CMD_INVENTORY; data[2]=0; // mask length datalen=AddCrc(data,3); - recvlen=SendDataTag(data,datalen,0,speed,&recv); + recvlen=SendDataTag(data, datalen, false, speed, &recv); WDT_HIT(); if (recvlen>=12) { Dbprintf("NoAFI UID=%s",sprintUID(NULL,&recv[2])); @@ -1195,7 +1185,7 @@ void BruteforceIso15693Afi(uint32_t speed) for (int i=0;i<256;i++) { data[2]=i & 0xFF; datalen=AddCrc(data,4); - recvlen=SendDataTag(data,datalen,0,speed,&recv); + recvlen=SendDataTag(data, datalen, false, speed, &recv); WDT_HIT(); if (recvlen>=12) { Dbprintf("AFI=%i UID=%s",i,sprintUID(NULL,&recv[2])); @@ -1203,26 +1193,27 @@ void BruteforceIso15693Afi(uint32_t speed) } Dbprintf("AFI Bruteforcing done."); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); } // Allows to directly send commands to the tag via the client -void DirectTag15693Command(uint32_t datalen,uint32_t speed, uint32_t recv, uint8_t data[]) { +void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint8_t data[]) { int recvlen=0; uint8_t *recvbuf = BigBuf_get_addr(); -// UsbCommand n; + + LED_A_ON(); if (DEBUG) { Dbprintf("SEND"); Dbhexdump(datalen,data,true); } - recvlen=SendDataTag(data,datalen,1,speed,(recv?&recvbuf:NULL)); + recvlen = SendDataTag(data, datalen, true, speed, (recv?&recvbuf:NULL)); if (recv) { - LED_B_ON(); - cmd_send(CMD_ACK,recvlen>48?48:recvlen,0,0,recvbuf,48); - LED_B_OFF(); + cmd_send(CMD_ACK, recvlen>48?48:recvlen, 0, 0, recvbuf, 48); if (DEBUG) { Dbprintf("RECV"); @@ -1231,6 +1222,12 @@ void DirectTag15693Command(uint32_t datalen,uint32_t speed, uint32_t recv, uint8 } } + // 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(); }