X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/67ac4bf75c6953cae546159acd3e887d757bd0c3..f921c113c91ed6940f030db837e83afe4dab9ca8:/armsrc/iso14443b.c?ds=inline diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index 8add8f9c..22227e74 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -5,9 +5,8 @@ // at your option, any later version. See the LICENSE.txt file for the text of // the license. //----------------------------------------------------------------------------- -// Routines to support ISO 14443. This includes both the reader software and -// the `fake tag' modes. At the moment only the Type B modulation is -// supported. +// Routines to support ISO 14443B. This includes both the reader software and +// the `fake tag' modes. //----------------------------------------------------------------------------- #include "proxmark3.h" @@ -17,15 +16,11 @@ #include "iso14443crc.h" -//static void GetSamplesFor14443(int weTx, int n); - -/*#define DEMOD_TRACE_SIZE 4096 -#define READER_TAG_BUFFER_SIZE 2048 -#define TAG_READER_BUFFER_SIZE 2048 -#define DEMOD_DMA_BUFFER_SIZE 1024 -*/ - #define RECEIVE_SAMPLES_TIMEOUT 2000 +#define ISO14443B_DMA_BUFFER_SIZE 256 + +// PCB Block number for APDUs +static uint8_t pcb_blocknum = 0; //============================================================================= // An ISO 14443 Type B tag. We listen for commands from the reader, using @@ -104,14 +99,14 @@ static void CodeIso14443bAsTag(const uint8_t *cmd, int len) ToSendStuffBit(1); } - // Send SOF. + // Send EOF. for(i = 0; i < 10; i++) { ToSendStuffBit(0); ToSendStuffBit(0); ToSendStuffBit(0); ToSendStuffBit(0); } - for(i = 0; i < 10; i++) { + for(i = 0; i < 2; i++) { ToSendStuffBit(1); ToSendStuffBit(1); ToSendStuffBit(1); @@ -120,9 +115,6 @@ static void CodeIso14443bAsTag(const uint8_t *cmd, int len) // Convert from last byte pos to length ToSendMax++; - - // Add a few more for slop - ToSendMax += 2; } //----------------------------------------------------------------------------- @@ -134,8 +126,7 @@ static struct { STATE_UNSYNCD, STATE_GOT_FALLING_EDGE_OF_SOF, STATE_AWAITING_START_BIT, - STATE_RECEIVING_DATA, - STATE_ERROR_WAIT + STATE_RECEIVING_DATA } state; uint16_t shiftReg; int bitCnt; @@ -146,6 +137,9 @@ static struct { } Uart; /* Receive & handle a bit coming from the reader. + * + * This function is called 4 times per bit (every 2 subcarrier cycles). + * Subcarrier frequency fs is 848kHz, 1/fs = 1,18us, i.e. function is called every 2,36us * * LED handling: * LED A -> ON once we have received the SOF and are expecting the rest. @@ -154,11 +148,10 @@ static struct { * Returns: true if we received a EOF * false if we are still waiting for some more */ -static int Handle14443UartBit(int bit) +static RAMFUNC int Handle14443bUartBit(uint8_t bit) { switch(Uart.state) { case STATE_UNSYNCD: - LED_A_OFF(); if(!bit) { // we went low, so this could be the beginning // of an SOF @@ -170,9 +163,9 @@ static int Handle14443UartBit(int bit) case STATE_GOT_FALLING_EDGE_OF_SOF: Uart.posCnt++; - if(Uart.posCnt == 2) { + if(Uart.posCnt == 2) { // sample every 4 1/fs in the middle of a bit if(bit) { - if(Uart.bitCnt >= 10) { + if(Uart.bitCnt > 9) { // we've seen enough consecutive // zeros that it's a valid SOF Uart.posCnt = 0; @@ -182,7 +175,7 @@ static int Handle14443UartBit(int bit) } else { // didn't stay down long enough // before going high, error - Uart.state = STATE_ERROR_WAIT; + Uart.state = STATE_UNSYNCD; } } else { // do nothing, keep waiting @@ -190,20 +183,21 @@ static int Handle14443UartBit(int bit) Uart.bitCnt++; } if(Uart.posCnt >= 4) Uart.posCnt = 0; - if(Uart.bitCnt > 14) { + if(Uart.bitCnt > 12) { // Give up if we see too many zeros without // a one, too. - Uart.state = STATE_ERROR_WAIT; + LED_A_OFF(); + Uart.state = STATE_UNSYNCD; } break; case STATE_AWAITING_START_BIT: Uart.posCnt++; if(bit) { - if(Uart.posCnt > 25) { + if(Uart.posCnt > 50/2) { // max 57us between characters = 49 1/fs, max 3 etus after low phase of SOF = 24 1/fs // stayed high for too long between // characters, error - Uart.state = STATE_ERROR_WAIT; + Uart.state = STATE_UNSYNCD; } } else { // falling edge, this starts the data byte @@ -211,7 +205,6 @@ static int Handle14443UartBit(int bit) Uart.bitCnt = 0; Uart.shiftReg = 0; Uart.state = STATE_RECEIVING_DATA; - LED_A_ON(); // Indicate we're receiving } break; @@ -238,46 +231,54 @@ static int Handle14443UartBit(int bit) if(Uart.byteCnt >= Uart.byteCntMax) { // Buffer overflowed, give up - Uart.posCnt = 0; - Uart.state = STATE_ERROR_WAIT; + LED_A_OFF(); + Uart.state = STATE_UNSYNCD; } else { // so get the next byte now Uart.posCnt = 0; Uart.state = STATE_AWAITING_START_BIT; } - } else if(Uart.shiftReg == 0x000) { + } else if (Uart.shiftReg == 0x000) { // this is an EOF byte LED_A_OFF(); // Finished receiving - return TRUE; + Uart.state = STATE_UNSYNCD; + if (Uart.byteCnt != 0) { + return TRUE; + } } else { // this is an error - Uart.posCnt = 0; - Uart.state = STATE_ERROR_WAIT; + LED_A_OFF(); + Uart.state = STATE_UNSYNCD; } } break; - case STATE_ERROR_WAIT: - // We're all screwed up, so wait a little while - // for whatever went wrong to finish, and then - // start over. - Uart.posCnt++; - if(Uart.posCnt > 10) { - Uart.state = STATE_UNSYNCD; - } - break; - default: + LED_A_OFF(); Uart.state = STATE_UNSYNCD; break; } - // This row make the error blew circular buffer in hf 14b snoop - //if (Uart.state == STATE_ERROR_WAIT) LED_A_OFF(); // Error - return FALSE; } + +static void UartReset() +{ + Uart.byteCntMax = MAX_FRAME_SIZE; + Uart.state = STATE_UNSYNCD; + Uart.byteCnt = 0; + Uart.bitCnt = 0; +} + + +static void UartInit(uint8_t *data) +{ + Uart.output = data; + UartReset(); +} + + //----------------------------------------------------------------------------- // 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 @@ -287,76 +288,89 @@ static int Handle14443UartBit(int bit) // Assume that we're called with the SSC (to the FPGA) and ADC path set // correctly. //----------------------------------------------------------------------------- -static int GetIso14443CommandFromReader(uint8_t *received, int *len, int maxLen) +static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) { - uint8_t mask; - int i, bit; - - // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen + // Set FPGA mode to "simulated ISO 14443B tag", no modulation (listen // only, since we are receiving, not transmitting). // Signal field is off with the appropriate LED LED_D_OFF(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); - // Now run a `software UART' on the stream of incoming samples. - Uart.output = received; - Uart.byteCntMax = maxLen; - Uart.state = STATE_UNSYNCD; + UartInit(received); for(;;) { WDT_HIT(); if(BUTTON_PRESS()) return FALSE; - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x00; - } if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - - mask = 0x80; - for(i = 0; i < 8; i++, mask >>= 1) { - bit = (b & mask); - if(Handle14443UartBit(bit)) { + for(uint8_t mask = 0x80; mask != 0x00; mask >>= 1) { + if(Handle14443bUartBit(b & mask)) { *len = Uart.byteCnt; return TRUE; } } } } + + return FALSE; } //----------------------------------------------------------------------------- // Main loop of simulated tag: receive commands from reader, decide what // response to send, and send it. //----------------------------------------------------------------------------- -void SimulateIso14443Tag(void) +void SimulateIso14443bTag(void) { - static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; + // the only commands we understand is WUPB, AFI=0, Select All, N=1: + static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; // WUPB + // ... and REQB, AFI=0, Normal Request, N=1: + static const uint8_t cmd2[] = { 0x05, 0x00, 0x00, 0x71, 0xFF }; // REQB + // ... and HLTB + static const uint8_t cmd3[] = { 0x50, 0xff, 0xff, 0xff, 0xff }; // HLTB + // ... and ATTRIB + static const uint8_t cmd4[] = { 0x1D, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; // ATTRIB + + // ... and we always respond with ATQB, PUPI = 820de174, Application Data = 0x20381922, + // supports only 106kBit/s in both directions, max frame size = 32Bytes, + // supports ISO14443-4, FWI=8 (77ms), NAD supported, CID not supported: static const uint8_t response1[] = { 0x50, 0x82, 0x0d, 0xe1, 0x74, 0x20, 0x38, 0x19, 0x22, 0x00, 0x21, 0x85, 0x5e, 0xd7 }; + // response to HLTB and ATTRIB + static const uint8_t response2[] = {0x00, 0x78, 0xF0}; - uint8_t *resp; - int respLen; - uint8_t *resp1 = BigBuf_get_addr() + 800; - int resp1Len; + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - uint8_t *receivedCmd = BigBuf_get_addr(); - int len; + clear_trace(); + set_tracing(TRUE); - int i; + const uint8_t *resp; + uint8_t *respCode; + uint16_t respLen, respCodeLen; - int cmdsRecvd = 0; + // allocate command receive buffer + BigBuf_free(); + uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE); - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - memset(receivedCmd, 0x44, 400); + uint16_t len; + uint16_t cmdsRecvd = 0; + // prepare the (only one) tag answer: CodeIso14443bAsTag(response1, sizeof(response1)); - memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax; + uint8_t *resp1Code = BigBuf_malloc(ToSendMax); + memcpy(resp1Code, ToSend, ToSendMax); + uint16_t resp1CodeLen = ToSendMax; + + // prepare the (other) tag answer: + CodeIso14443bAsTag(response2, sizeof(response2)); + uint8_t *resp2Code = BigBuf_malloc(ToSendMax); + memcpy(resp2Code, ToSend, ToSendMax); + uint16_t resp2CodeLen = ToSendMax; // We need to listen to the high-frequency, peak-detected path. SetAdcMuxFor(GPIO_MUXSEL_HIPKD); @@ -365,32 +379,53 @@ void SimulateIso14443Tag(void) cmdsRecvd = 0; for(;;) { - uint8_t b1, b2; - if(!GetIso14443CommandFromReader(receivedCmd, &len, 100)) { - Dbprintf("button pressed, received %d commands", cmdsRecvd); - break; + if(!GetIso14443bCommandFromReader(receivedCmd, &len)) { + Dbprintf("button pressed, received %d commands", cmdsRecvd); + break; } - // Good, look at the command now. + if (tracing) { + uint8_t parity[MAX_PARITY_SIZE]; + LogTrace(receivedCmd, len, 0, 0, parity, TRUE); + } - if(len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len)==0) { - resp = resp1; respLen = resp1Len; + // Good, look at the command now. + if ( (len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len) == 0) + || (len == sizeof(cmd2) && memcmp(receivedCmd, cmd2, len) == 0) ) { + resp = response1; + respLen = sizeof(response1); + respCode = resp1Code; + respCodeLen = resp1CodeLen; + } else if ( (len == sizeof(cmd3) && receivedCmd[0] == cmd3[0]) + || (len == sizeof(cmd4) && receivedCmd[0] == cmd4[0]) ) { + resp = response2; + respLen = sizeof(response2); + respCode = resp2Code; + respCodeLen = resp2CodeLen; } else { Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd); // And print whether the CRC fails, just for good measure - ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2); - if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) { - // Not so good, try again. - DbpString("+++CRC fail"); - } else { - DbpString("CRC passes"); + uint8_t b1, b2; + if (len >= 3){ // if crc exists + ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2); + if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) { + // Not so good, try again. + DbpString("+++CRC fail"); + + } else { + DbpString("CRC passes"); + } } - break; + //get rid of compiler warning + respCodeLen = 0; + resp = response1; + respLen = 0; + respCode = resp1Code; + //don't crash at new command just wait and see if reader will send other new cmds. + //break; } - memset(receivedCmd, 0x44, 32); - cmdsRecvd++; if(cmdsRecvd > 0x30) { @@ -398,7 +433,7 @@ void SimulateIso14443Tag(void) break; } - if(respLen <= 0) continue; + if(respCodeLen <= 0) continue; // Modulate BPSK // Signal field is off with the appropriate LED @@ -408,15 +443,15 @@ void SimulateIso14443Tag(void) FpgaSetupSsc(); // Transmit the response. - i = 0; + uint16_t i = 0; for(;;) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - uint8_t b = resp[i]; + uint8_t b = respCode[i]; AT91C_BASE_SSC->SSC_THR = b; i++; - if(i > respLen) { + if(i > respCodeLen) { break; } } @@ -425,6 +460,13 @@ void SimulateIso14443Tag(void) (void)b; } } + + // trace the response: + if (tracing) { + uint8_t parity[MAX_PARITY_SIZE]; + LogTrace(resp, respLen, 0, 0, parity, FALSE); + } + } } @@ -442,14 +484,15 @@ static struct { DEMOD_AWAITING_FALLING_EDGE_OF_SOF, DEMOD_GOT_FALLING_EDGE_OF_SOF, DEMOD_AWAITING_START_BIT, - DEMOD_RECEIVING_DATA, - DEMOD_ERROR_WAIT + DEMOD_RECEIVING_DATA } state; int bitCount; int posCount; int thisBit; +/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented. int metric; int metricN; +*/ uint16_t shiftReg; uint8_t *output; int len; @@ -460,6 +503,9 @@ static struct { /* * Handles reception of a bit from the tag * + * This function is called 2 times per bit (every 4 subcarrier cycles). + * Subcarrier frequency fs is 848kHz, 1/fs = 1,18us, 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 @@ -468,12 +514,12 @@ static struct { * false if we are still waiting for some more * */ -static RAMFUNC int Handle14443SamplesDemod(int ci, int cq) +static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) { int v; - // The soft decision on the bit uses an estimate of just the - // quadrant of the reference angle, not the exact angle. +// The soft decision on the bit uses an estimate of just the +// quadrant of the reference angle, not the exact angle. #define MAKE_SOFT_DECISION() { \ if(Demod.sumI > 0) { \ v = ci; \ @@ -487,47 +533,93 @@ static RAMFUNC int Handle14443SamplesDemod(int ci, int cq) } \ } +#define SUBCARRIER_DETECT_THRESHOLD 8 + +// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by abs(ci) + abs(cq) +/* #define CHECK_FOR_SUBCARRIER() { \ + v = ci; \ + if(v < 0) v = -v; \ + if(cq > 0) { \ + v += cq; \ + } else { \ + v -= cq; \ + } \ + } + */ +// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq))) + + //note: couldn't we just use MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2) from common.h - marshmellow +#define CHECK_FOR_SUBCARRIER() { \ + v = MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2); \ + } + /* + if(ci < 0) { \ + if(cq < 0) { \ // ci < 0, cq < 0 + if (cq < ci) { \ + v = -cq - (ci >> 1); \ + } else { \ + v = -ci - (cq >> 1); \ + } \ + } else { \ // ci < 0, cq >= 0 + if (cq < -ci) { \ + v = -ci + (cq >> 1); \ + } else { \ + v = cq - (ci >> 1); \ + } \ + } \ + } else { \ + if(cq < 0) { \ // ci >= 0, cq < 0 + if (-cq < ci) { \ + v = ci - (cq >> 1); \ + } else { \ + v = -cq + (ci >> 1); \ + } \ + } else { \ // ci >= 0, cq >= 0 + if (cq < ci) { \ + v = ci + (cq >> 1); \ + } else { \ + v = cq + (ci >> 1); \ + } \ + } \ + } \ + } + */ + switch(Demod.state) { case DEMOD_UNSYNCD: - v = ci; - if(v < 0) v = -v; - if(cq > 0) { - v += cq; - } else { - v -= cq; - } - if(v > 40) { - Demod.posCount = 0; + CHECK_FOR_SUBCARRIER(); + if(v > SUBCARRIER_DETECT_THRESHOLD) { // subcarrier detected Demod.state = DEMOD_PHASE_REF_TRAINING; - Demod.sumI = 0; - Demod.sumQ = 0; - } + Demod.sumI = ci; + Demod.sumQ = cq; + Demod.posCount = 1; + } break; case DEMOD_PHASE_REF_TRAINING: if(Demod.posCount < 8) { - Demod.sumI += ci; - Demod.sumQ += cq; - } else if(Demod.posCount > 100) { - // error, waited too long - Demod.state = DEMOD_UNSYNCD; - } else { - MAKE_SOFT_DECISION(); - if(v < 0) { - Demod.state = DEMOD_AWAITING_FALLING_EDGE_OF_SOF; - Demod.posCount = 0; + CHECK_FOR_SUBCARRIER(); + if (v > SUBCARRIER_DETECT_THRESHOLD) { + // set the reference phase (will code a logic '1') by averaging over 32 1/fs. + // note: synchronization time > 80 1/fs + Demod.sumI += ci; + Demod.sumQ += cq; + Demod.posCount++; + } else { // subcarrier lost + Demod.state = DEMOD_UNSYNCD; } + } else { + Demod.state = DEMOD_AWAITING_FALLING_EDGE_OF_SOF; } - Demod.posCount++; break; case DEMOD_AWAITING_FALLING_EDGE_OF_SOF: MAKE_SOFT_DECISION(); - if(v < 0) { + if(v < 0) { // logic '0' detected Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF; - Demod.posCount = 0; + Demod.posCount = 0; // start of SOF sequence } else { - if(Demod.posCount > 100) { + if(Demod.posCount > 200/4) { // maximum length of TR1 = 200 1/fs Demod.state = DEMOD_UNSYNCD; } } @@ -535,35 +627,40 @@ static RAMFUNC int Handle14443SamplesDemod(int ci, int cq) break; case DEMOD_GOT_FALLING_EDGE_OF_SOF: + Demod.posCount++; MAKE_SOFT_DECISION(); if(v > 0) { - if(Demod.posCount < 12) { + if(Demod.posCount < 9*2) { // low phase of SOF too short (< 9 etu). Note: spec is >= 10, but FPGA tends to "smear" edges Demod.state = DEMOD_UNSYNCD; } else { LED_C_ON(); // Got SOF Demod.state = DEMOD_AWAITING_START_BIT; Demod.posCount = 0; Demod.len = 0; +/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented. Demod.metricN = 0; Demod.metric = 0; +*/ } } else { - if(Demod.posCount > 100) { + if(Demod.posCount > 12*2) { // low phase of SOF too long (> 12 etu) Demod.state = DEMOD_UNSYNCD; + LED_C_OFF(); } } - Demod.posCount++; break; case DEMOD_AWAITING_START_BIT: + Demod.posCount++; MAKE_SOFT_DECISION(); if(v > 0) { - if(Demod.posCount > 10) { + if(Demod.posCount > 3*2) { // max 19us between characters = 16 1/fs, max 3 etu after low phase of SOF = 24 1/fs Demod.state = DEMOD_UNSYNCD; + LED_C_OFF(); } - } else { + } else { // start bit detected Demod.bitCount = 0; - Demod.posCount = 1; + Demod.posCount = 1; // this was the first half Demod.thisBit = v; Demod.shiftReg = 0; Demod.state = DEMOD_RECEIVING_DATA; @@ -572,39 +669,41 @@ static RAMFUNC int Handle14443SamplesDemod(int ci, int cq) case DEMOD_RECEIVING_DATA: MAKE_SOFT_DECISION(); - if(Demod.posCount == 0) { + if(Demod.posCount == 0) { // first half of bit Demod.thisBit = v; Demod.posCount = 1; - } else { + } else { // second half of bit Demod.thisBit += v; +/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented. if(Demod.thisBit > 0) { Demod.metric += Demod.thisBit; } else { Demod.metric -= Demod.thisBit; } (Demod.metricN)++; +*/ Demod.shiftReg >>= 1; - if(Demod.thisBit > 0) { + if(Demod.thisBit > 0) { // logic '1' Demod.shiftReg |= 0x200; } Demod.bitCount++; if(Demod.bitCount == 10) { uint16_t s = Demod.shiftReg; - if((s & 0x200) && !(s & 0x001)) { + if((s & 0x200) && !(s & 0x001)) { // stop bit == '1', start bit == '0' uint8_t b = (s >> 1); Demod.output[Demod.len] = b; Demod.len++; Demod.state = DEMOD_AWAITING_START_BIT; - } else if(s == 0x000) { - // This is EOF - LED_C_OFF(); - Demod.state = DEMOD_UNSYNCD; - return TRUE; } else { Demod.state = DEMOD_UNSYNCD; + LED_C_OFF(); + if(s == 0x000) { + // This is EOF (start, stop and all data bits == '0' + return TRUE; + } } } Demod.posCount = 0; @@ -613,10 +712,10 @@ static RAMFUNC int Handle14443SamplesDemod(int ci, int cq) default: Demod.state = DEMOD_UNSYNCD; + LED_C_OFF(); break; } - if (Demod.state == DEMOD_UNSYNCD) LED_C_OFF(); // Not synchronized... return FALSE; } @@ -626,6 +725,7 @@ static void DemodReset() // Clear out the state of the "UART" that receives from the tag. Demod.len = 0; Demod.state = DEMOD_UNSYNCD; + Demod.posCount = 0; memset(Demod.output, 0x00, MAX_FRAME_SIZE); } @@ -637,139 +737,86 @@ static void DemodInit(uint8_t *data) } -static void UartReset() -{ - Uart.byteCntMax = MAX_FRAME_SIZE; - Uart.state = STATE_UNSYNCD; - Uart.byteCnt = 0; - Uart.bitCnt = 0; -} - - -static void UartInit(uint8_t *data) -{ - Uart.output = data; - UartReset(); -} - - /* * Demodulate the samples we received from the tag, also log to tracebuffer - * weTx: set to 'TRUE' if we behave like a reader - * set to 'FALSE' if we behave like a snooper * quiet: set to 'TRUE' to disable debug output */ -static void GetSamplesFor14443Demod(int weTx, int n, int quiet) +static void GetSamplesFor14443bDemod(int n, bool quiet) { int max = 0; - int gotFrame = FALSE; + bool gotFrame = FALSE; int lastRxCounter, ci, cq, samples = 0; // Allocate memory from BigBuf for some buffers // free all previous allocations first BigBuf_free(); - + // The response (tag -> reader) that we're receiving. uint8_t *receivedResponse = BigBuf_malloc(MAX_FRAME_SIZE); - + // The DMA buffer, used to stream samples from the FPGA - int8_t *dmaBuf = (int8_t*) BigBuf_malloc(DMA_BUFFER_SIZE); + int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE); // Set up the demodulator for tag -> reader responses. DemodInit(receivedResponse); // Setup and start DMA. - FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE); + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); int8_t *upTo = dmaBuf; - lastRxCounter = DMA_BUFFER_SIZE; + lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; // Signal field is ON with the appropriate LED: - if (weTx) LED_D_ON(); else LED_D_OFF(); + LED_D_ON(); // And put the FPGA in the appropriate mode - FpgaWriteConfWord( - FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ | - (weTx ? 0 : FPGA_HF_READER_RX_XCORR_SNOOP)); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); for(;;) { int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR; if(behindBy > max) max = behindBy; - while(((lastRxCounter-AT91C_BASE_PDC_SSC->PDC_RCR) & (DMA_BUFFER_SIZE-1)) - > 2) - { + while(((lastRxCounter-AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1)) > 2) { ci = upTo[0]; cq = upTo[1]; upTo += 2; - if(upTo >= dmaBuf + DMA_BUFFER_SIZE) { + if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { upTo = dmaBuf; AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo; - AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; + AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE; } lastRxCounter -= 2; if(lastRxCounter <= 0) { - lastRxCounter += DMA_BUFFER_SIZE; + lastRxCounter += ISO14443B_DMA_BUFFER_SIZE; } samples += 2; - if(Handle14443SamplesDemod(ci, cq)) { - gotFrame = 1; + if(Handle14443bSamplesDemod(ci, cq)) { + gotFrame = TRUE; + break; } } - if(samples > n) { + if(samples > n || gotFrame) { break; } } + AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; - if (!quiet) Dbprintf("%x %x %x", max, gotFrame, Demod.len); + + if (!quiet) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d", max, samples, gotFrame, Demod.len, Demod.sumI, Demod.sumQ); //Tracing if (tracing && Demod.len > 0) { uint8_t parity[MAX_PARITY_SIZE]; - GetParity(Demod.output, Demod.len, parity); LogTrace(Demod.output, Demod.len, 0, 0, parity, FALSE); } } -//----------------------------------------------------------------------------- -// Read the tag's response. We just receive a stream of slightly-processed -// samples from the FPGA, which we will later do some signal processing on, -// to get the bits. -//----------------------------------------------------------------------------- -/*static void GetSamplesFor14443(int weTx, int n) -{ - uint8_t *dest = (uint8_t *)BigBuf; - int c; - - FpgaWriteConfWord( - FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ | - (weTx ? 0 : FPGA_HF_READER_RX_XCORR_SNOOP)); - - c = 0; - 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; - - dest[c++] = (uint8_t)b; - - if(c >= n) { - break; - } - } - } -}*/ - - //----------------------------------------------------------------------------- // Transmit the command (to the tag) that was placed in ToSend[]. //----------------------------------------------------------------------------- -static void TransmitFor14443(void) +static void TransmitFor14443b(void) { int c; @@ -783,8 +830,7 @@ static void TransmitFor14443(void) LED_D_ON(); // Signal we are transmitting with the Green LED LED_B_ON(); - FpgaWriteConfWord( - FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD); for(c = 0; c < 10;) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { @@ -819,7 +865,7 @@ static void TransmitFor14443(void) //----------------------------------------------------------------------------- // Code a layer 2 command (string of octets, including CRC) into ToSend[], -// so that it is ready to transmit to the tag using TransmitFor14443(). +// so that it is ready to transmit to the tag using TransmitFor14443b(). //----------------------------------------------------------------------------- static void CodeIso14443bAsReader(const uint8_t *cmd, int len) { @@ -874,39 +920,114 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) } -//----------------------------------------------------------------------------- -// Read an ISO 14443 tag. We send it some set of commands, and record the -// responses. -// The command name is misleading, it actually decodes the reponse in HEX -// into the output buffer (read the result using hexsamples, not hisamples) -// -// obsolete function only for test -//----------------------------------------------------------------------------- -void AcquireRawAdcSamplesIso14443(uint32_t parameter) -{ - uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; - - SendRawCommand14443B(sizeof(cmd1),1,1,cmd1); -} - - /** Convenience function to encode, transmit and trace iso 14443b comms **/ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) { CodeIso14443bAsReader(cmd, len); - TransmitFor14443(); + TransmitFor14443b(); if (tracing) { uint8_t parity[MAX_PARITY_SIZE]; - GetParity(cmd, len, parity); LogTrace(cmd,len, 0, 0, parity, TRUE); } } +/* Sends an APDU to the tag + * TODO: check CRC and preamble + */ +int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response) +{ + uint8_t message_frame[message_length + 4]; + // PCB + message_frame[0] = 0x0A | pcb_blocknum; + pcb_blocknum ^= 1; + // CID + message_frame[1] = 0; + // INF + memcpy(message_frame + 2, message, message_length); + // EDC (CRC) + ComputeCrc14443(CRC_14443_B, message_frame, message_length + 2, &message_frame[message_length + 2], &message_frame[message_length + 3]); + // send + CodeAndTransmit14443bAsReader(message_frame, message_length + 4); + // get response + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT*100, TRUE); + if(Demod.len < 3) + { + return 0; + } + // TODO: Check CRC + // copy response contents + if(response != NULL) + { + memcpy(response, Demod.output, Demod.len); + } + return Demod.len; +} + +/* Perform the ISO 14443 B Card Selection procedure + * Currently does NOT do any collision handling. + * It expects 0-1 cards in the device's range. + * TODO: Support multiple cards (perform anticollision) + * TODO: Verify CRC checksums + */ +int iso14443b_select_card() +{ + // WUPB command (including CRC) + // Note: WUPB wakes up all tags, REQB doesn't wake up tags in HALT state + static const uint8_t wupb[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; + // ATTRIB command (with space for CRC) + uint8_t attrib[] = { 0x1D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00}; + + // first, wake up the tag + CodeAndTransmit14443bAsReader(wupb, sizeof(wupb)); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + // ATQB too short? + if (Demod.len < 14) + { + return 2; + } + + // select the tag + // copy the PUPI to ATTRIB + memcpy(attrib + 1, Demod.output + 1, 4); + /* copy the protocol info from ATQB (Protocol Info -> Protocol_Type) into + ATTRIB (Param 3) */ + attrib[7] = Demod.output[10] & 0x0F; + ComputeCrc14443(CRC_14443_B, attrib, 9, attrib + 9, attrib + 10); + CodeAndTransmit14443bAsReader(attrib, sizeof(attrib)); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + // Answer to ATTRIB too short? + if(Demod.len < 3) + { + return 2; + } + // reset PCB block number + pcb_blocknum = 0; + return 1; +} + +// Set up ISO 14443 Type B communication (similar to iso14443a_setup) +void iso14443b_setup() { + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + // Set up the synchronous serial port + FpgaSetupSsc(); + // connect Demodulated Signal to ADC: + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + + // Signal field is on with the appropriate LED + LED_D_ON(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD); + + // Start the timer + StartCountSspClk(); + + DemodReset(); + UartReset(); +} //----------------------------------------------------------------------------- -// Read a SRI512 ISO 14443 tag. +// Read a SRI512 ISO 14443B tag. // // SRI512 tags are just simple memory tags, here we're looking at making a dump // of the contents of the memory. No anticollision algorithm is done, we assume @@ -914,11 +1035,8 @@ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) // // I tried to be systematic and check every answer of the tag, every CRC, etc... //----------------------------------------------------------------------------- -void ReadSTMemoryIso14443(uint32_t dwLast) +void ReadSTMemoryIso14443b(uint32_t dwLast) { - clear_trace(); - set_tracing(TRUE); - uint8_t i = 0x00; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); @@ -934,108 +1052,100 @@ void ReadSTMemoryIso14443(uint32_t dwLast) // Now give it time to spin up. // Signal field is on with the appropriate LED LED_D_ON(); - FpgaWriteConfWord( - FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); SpinDelay(200); - // First command: wake up the tag using the INITIATE command - uint8_t cmd1[] = { 0x06, 0x00, 0x97, 0x5b}; + clear_trace(); + set_tracing(TRUE); + // First command: wake up the tag using the INITIATE command + uint8_t cmd1[] = {0x06, 0x00, 0x97, 0x5b}; CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); -// LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); -// LED_A_OFF(); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); if (Demod.len == 0) { - DbpString("No response from tag"); - return; + DbpString("No response from tag"); + return; } else { - Dbprintf("Randomly generated UID from tag (+ 2 byte CRC): %x %x %x", - Demod.output[0], Demod.output[1],Demod.output[2]); + Dbprintf("Randomly generated Chip ID (+ 2 byte CRC): %02x %02x %02x", + Demod.output[0], Demod.output[1], Demod.output[2]); } + // There is a response, SELECT the uid DbpString("Now SELECT tag:"); cmd1[0] = 0x0E; // 0x0E is SELECT cmd1[1] = Demod.output[0]; ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]); CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - -// LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); -// LED_A_OFF(); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); if (Demod.len != 3) { - Dbprintf("Expected 3 bytes from tag, got %d", Demod.len); - return; + Dbprintf("Expected 3 bytes from tag, got %d", Demod.len); + return; } // Check the CRC of the answer: ComputeCrc14443(CRC_14443_B, Demod.output, 1 , &cmd1[2], &cmd1[3]); if(cmd1[2] != Demod.output[1] || cmd1[3] != Demod.output[2]) { - DbpString("CRC Error reading select response."); - return; + DbpString("CRC Error reading select response."); + return; } // Check response from the tag: should be the same UID as the command we just sent: if (cmd1[1] != Demod.output[0]) { - Dbprintf("Bad response to SELECT from Tag, aborting: %x %x", cmd1[1], Demod.output[0]); - return; + Dbprintf("Bad response to SELECT from Tag, aborting: %02x %02x", cmd1[1], Demod.output[0]); + return; } + // Tag is now selected, // First get the tag's UID: cmd1[0] = 0x0B; ComputeCrc14443(CRC_14443_B, cmd1, 1 , &cmd1[1], &cmd1[2]); CodeAndTransmit14443bAsReader(cmd1, 3); // Only first three bytes for this one - -// LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); -// LED_A_OFF(); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); if (Demod.len != 10) { - Dbprintf("Expected 10 bytes from tag, got %d", Demod.len); - return; + Dbprintf("Expected 10 bytes from tag, got %d", Demod.len); + return; } // The check the CRC of the answer (use cmd1 as temporary variable): ComputeCrc14443(CRC_14443_B, Demod.output, 8, &cmd1[2], &cmd1[3]); - if(cmd1[2] != Demod.output[8] || cmd1[3] != Demod.output[9]) { - Dbprintf("CRC Error reading block! - Below: expected, got %x %x", - (cmd1[2]<<8)+cmd1[3], (Demod.output[8]<<8)+Demod.output[9]); - // Do not return;, let's go on... (we should retry, maybe ?) + if(cmd1[2] != Demod.output[8] || cmd1[3] != Demod.output[9]) { + Dbprintf("CRC Error reading block! Expected: %04x got: %04x", + (cmd1[2]<<8)+cmd1[3], (Demod.output[8]<<8)+Demod.output[9]); + // Do not return;, let's go on... (we should retry, maybe ?) } Dbprintf("Tag UID (64 bits): %08x %08x", - (Demod.output[7]<<24) + (Demod.output[6]<<16) + (Demod.output[5]<<8) + Demod.output[4], - (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0]); + (Demod.output[7]<<24) + (Demod.output[6]<<16) + (Demod.output[5]<<8) + Demod.output[4], + (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0]); // Now loop to read all 16 blocks, address from 0 to last block - Dbprintf("Tag memory dump, block 0 to %d",dwLast); + Dbprintf("Tag memory dump, block 0 to %d", dwLast); cmd1[0] = 0x08; i = 0x00; dwLast++; for (;;) { - if (i == dwLast) { + if (i == dwLast) { DbpString("System area block (0xff):"); i = 0xff; } cmd1[1] = i; ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]); CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - -// LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); -// LED_A_OFF(); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); if (Demod.len != 6) { // Check if we got an answer from the tag - DbpString("Expected 6 bytes from tag, got less..."); - return; + DbpString("Expected 6 bytes from tag, got less..."); + return; } // The check the CRC of the answer (use cmd1 as temporary variable): ComputeCrc14443(CRC_14443_B, Demod.output, 4, &cmd1[2], &cmd1[3]); - if(cmd1[2] != Demod.output[4] || cmd1[3] != Demod.output[5]) { - Dbprintf("CRC Error reading block! - Below: expected, got %x %x", - (cmd1[2]<<8)+cmd1[3], (Demod.output[4]<<8)+Demod.output[5]); - // Do not return;, let's go on... (we should retry, maybe ?) + if(cmd1[2] != Demod.output[4] || cmd1[3] != Demod.output[5]) { + Dbprintf("CRC Error reading block! Expected: %04x got: %04x", + (cmd1[2]<<8)+cmd1[3], (Demod.output[4]<<8)+Demod.output[5]); + // Do not return;, let's go on... (we should retry, maybe ?) } // Now print out the memory location: - Dbprintf("Address=%x, Contents=%x, CRC=%x", i, - (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0], - (Demod.output[4]<<8)+Demod.output[5]); + Dbprintf("Address=%02x, Contents=%08x, CRC=%04x", i, + (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0], + (Demod.output[4]<<8)+Demod.output[5]); if (i == 0xff) { - break; + break; } i++; } @@ -1054,17 +1164,17 @@ void ReadSTMemoryIso14443(uint32_t dwLast) //----------------------------------------------------------------------------- /* * Memory usage for this function, (within BigBuf) - * 0-4095 : Demodulated samples receive (4096 bytes) - DEMOD_TRACE_SIZE - * 4096-6143 : Last Received command, 2048 bytes (reader->tag) - READER_TAG_BUFFER_SIZE - * 6144-8191 : Last Received command, 2048 bytes(tag->reader) - TAG_READER_BUFFER_SIZE - * 8192-9215 : DMA Buffer, 1024 bytes (samples) - DEMOD_DMA_BUFFER_SIZE + * Last Received command (reader->tag) - MAX_FRAME_SIZE + * Last Received command (tag->reader) - MAX_FRAME_SIZE + * DMA Buffer - ISO14443B_DMA_BUFFER_SIZE + * Demodulated samples received - all the rest */ -void RAMFUNC SnoopIso14443(void) +void RAMFUNC SnoopIso14443b(void) { // We won't start recording the frames that we acquire until we trigger; // a good trigger condition to get started is probably when we see a // response from the tag. - int triggered = TRUE; + int triggered = TRUE; // TODO: set and evaluate trigger condition FpgaDownloadAndGo(FPGA_BITSTREAM_HF); BigBuf_free(); @@ -1073,7 +1183,7 @@ void RAMFUNC SnoopIso14443(void) set_tracing(TRUE); // The DMA buffer, used to stream samples from the FPGA - int8_t *dmaBuf = (int8_t*) BigBuf_malloc(DMA_BUFFER_SIZE); + int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE); int lastRxCounter; int8_t *upTo; int ci, cq; @@ -1091,110 +1201,106 @@ void RAMFUNC SnoopIso14443(void) Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen()); Dbprintf(" Reader -> tag: %i bytes", MAX_FRAME_SIZE); Dbprintf(" tag -> Reader: %i bytes", MAX_FRAME_SIZE); - Dbprintf(" DMA: %i bytes", DMA_BUFFER_SIZE); + Dbprintf(" DMA: %i bytes", ISO14443B_DMA_BUFFER_SIZE); - // Signal field is off with the appropriate LED - LED_D_OFF(); + // 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_848_KHZ | - FPGA_HF_READER_RX_XCORR_SNOOP); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ | FPGA_HF_READER_RX_XCORR_SNOOP); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Setup for the DMA. FpgaSetupSsc(); upTo = dmaBuf; - lastRxCounter = DMA_BUFFER_SIZE; - FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE); + lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); uint8_t parity[MAX_PARITY_SIZE]; - LED_A_ON(); - + + bool TagIsActive = FALSE; + bool ReaderIsActive = FALSE; + // And now we loop, receiving samples. for(;;) { int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & - (DMA_BUFFER_SIZE-1); + (ISO14443B_DMA_BUFFER_SIZE-1); if(behindBy > maxBehindBy) { maxBehindBy = behindBy; - if(behindBy > (9*DMA_BUFFER_SIZE/10)) { // TODO: understand whether we can increase/decrease as we want or not? - Dbprintf("blew circular buffer! behindBy=0x%x", behindBy); - break; - } } + if(behindBy < 2) continue; ci = upTo[0]; cq = upTo[1]; upTo += 2; lastRxCounter -= 2; - if(upTo >= dmaBuf + DMA_BUFFER_SIZE) { + if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { upTo = dmaBuf; - lastRxCounter += DMA_BUFFER_SIZE; + lastRxCounter += ISO14443B_DMA_BUFFER_SIZE; AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; - AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; + AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE; + WDT_HIT(); + if(behindBy > (9*ISO14443B_DMA_BUFFER_SIZE/10)) { // TODO: understand whether we can increase/decrease as we want or not? + Dbprintf("blew circular buffer! behindBy=%d", behindBy); + break; + } + if(!tracing) { + DbpString("Reached trace limit"); + break; + } + if(BUTTON_PRESS()) { + DbpString("cancelled"); + break; + } } samples += 2; - if(Handle14443UartBit(ci & 1)) { - if(triggered && tracing) { - GetParity(Uart.output, Uart.byteCnt, parity); - LogTrace(Uart.output,Uart.byteCnt,samples, samples,parity,TRUE); + if (!TagIsActive) { // no need to try decoding reader data if the tag is sending + if(Handle14443bUartBit(ci & 0x01)) { + if(triggered && tracing) { + LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE); + } + /* And ready to receive another command. */ + UartReset(); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DemodReset(); } - if(Uart.byteCnt==0) Dbprintf("[1] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt); - - /* And ready to receive another command. */ - UartReset(); - /* And also reset the demod code, which might have been */ - /* false-triggered by the commands from the reader. */ - DemodReset(); - } - if(Handle14443UartBit(cq & 1)) { - if(triggered && tracing) { - GetParity(Uart.output, Uart.byteCnt, parity); - LogTrace(Uart.output,Uart.byteCnt,samples, samples, parity, TRUE); + if(Handle14443bUartBit(cq & 0x01)) { + if(triggered && tracing) { + LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE); + } + /* And ready to receive another command. */ + UartReset(); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DemodReset(); } - if(Uart.byteCnt==0) Dbprintf("[2] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt); - - /* And ready to receive another command. */ - UartReset(); - /* And also reset the demod code, which might have been */ - /* false-triggered by the commands from the reader. */ - DemodReset(); + ReaderIsActive = (Uart.state > STATE_GOT_FALLING_EDGE_OF_SOF); } - if(Handle14443SamplesDemod(ci, cq)) { - - //Use samples as a time measurement - if(tracing) - { - uint8_t parity[MAX_PARITY_SIZE]; - GetParity(Demod.output, Demod.len, parity); - LogTrace(Demod.output, Demod.len,samples, samples, parity, FALSE); - } - triggered = TRUE; - LED_A_OFF(); - LED_B_ON(); + if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time + if(Handle14443bSamplesDemod(ci | 0x01, cq | 0x01)) { - // And ready to receive another response. - DemodReset(); - } - WDT_HIT(); + //Use samples as a time measurement + if(tracing) + { + uint8_t parity[MAX_PARITY_SIZE]; + LogTrace(Demod.output, Demod.len, samples, samples, parity, FALSE); + } + triggered = TRUE; - if(!tracing) { - DbpString("Reached trace limit"); - break; + // And ready to receive another response. + DemodReset(); + } + TagIsActive = (Demod.state > DEMOD_GOT_FALLING_EDGE_OF_SOF); } - if(BUTTON_PRESS()) { - DbpString("cancelled"); - break; - } } + FpgaDisableSscDma(); - LED_A_OFF(); - LED_B_OFF(); - LED_C_OFF(); + LEDsoff(); AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; DbpString("Snoop statistics:"); Dbprintf(" Max behind by: %i", maxBehindBy); @@ -1220,38 +1326,22 @@ void RAMFUNC SnoopIso14443(void) void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[]) { FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - if(!powerfield) - { - // Make sure that we start from off, since the tags are stateful; - // confusing things will happen if we don't reset them between reads. - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LED_D_OFF(); - SpinDelay(200); - } + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + FpgaSetupSsc(); - if(!GETBIT(GPIO_LED_D)) - { - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + if (datalen){ + set_tracing(TRUE); + + CodeAndTransmit14443bAsReader(data, datalen); - // Now give it time to spin up. - // Signal field is on with the appropriate LED - LED_D_ON(); - FpgaWriteConfWord( - FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); - SpinDelay(200); + if(recv) { + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE); + cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen); + } } - CodeAndTransmit14443bAsReader(data, datalen); - - if(recv) - { - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); - uint16_t iLen = MIN(Demod.len,USB_CMD_DATA_SIZE); - cmd_send(CMD_ACK,iLen,0,0,Demod.output,iLen); - } - if(!powerfield) - { + if(!powerfield) { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); }