X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/09c66f1f09776989fda2d1005a2c9feb1db6b3ac..28ae37b74612436cc2e5fee4dbcc3e42cc9aaf03:/armsrc/iso14443b.c?ds=sidebyside diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index 4e40bb68..6434409d 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -1,31 +1,30 @@ //----------------------------------------------------------------------------- // Jonathan Westhues, split Nov 2006 +// piwi 2018 // // This code is licensed to you under the terms of the GNU GPL, version 2 or, // at your option, any later version. See the LICENSE.txt file for the text of // 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 "iso14443b.h" + #include "proxmark3.h" #include "apps.h" #include "util.h" #include "string.h" - #include "iso14443crc.h" +#include "fpgaloader.h" +#include "BigBuf.h" -//static void GetSamplesFor14443(int weTx, int n); +#define RECEIVE_SAMPLES_TIMEOUT 64 // TR0 max is 256/fs = 256/(848kHz) = 302us or 64 samples from FPGA +#define ISO14443B_DMA_BUFFER_SIZE 128 -/*#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 +// 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 +103,14 @@ 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 +119,6 @@ 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 +130,7 @@ 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 +141,9 @@ 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. @@ -154,7 +152,7 @@ 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: @@ -169,9 +167,9 @@ 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; @@ -181,7 +179,7 @@ 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 @@ -189,20 +187,21 @@ 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 @@ -236,157 +235,199 @@ 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; - LED_A_OFF(); - } - break; - default: + LED_A_OFF(); Uart.state = STATE_UNSYNCD; break; } - return FALSE; + 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 // spinning, waiting for a well-framed command, until either we get one -// (returns TRUE) or someone presses the pushbutton on the board (FALSE). +// (returns true) or someone presses the pushbutton on the board (false). // // 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(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 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 }; + LED_A_ON(); + // 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); - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR); 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. + LogTrace(receivedCmd, len, 0, 0, NULL, 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) { @@ -394,25 +435,25 @@ void SimulateIso14443Tag(void) break; } - if(respLen <= 0) continue; + if(respCodeLen <= 0) continue; // Modulate BPSK // Signal field is off with the appropriate LED LED_D_OFF(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK); AT91C_BASE_SSC->SSC_THR = 0xff; - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR); // 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; } } @@ -421,7 +462,14 @@ void SimulateIso14443Tag(void) (void)b; } } + + // trace the response: + LogTrace(resp, respLen, 0, 0, NULL, false); + } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_A_OFF(); } //============================================================================= @@ -438,14 +486,15 @@ 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; @@ -456,6 +505,9 @@ 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 @@ -464,12 +516,12 @@ 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; \ @@ -483,47 +535,43 @@ static RAMFUNC int Handle14443SamplesDemod(int ci, int cq) } \ } +#define SUBCARRIER_DETECT_THRESHOLD 8 + +// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq))) +#define AMPLITUDE(ci,cq) (MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2)) 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; + if(AMPLITUDE(ci,cq) > 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; + if (AMPLITUDE(ci,cq) > 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; } } @@ -531,37 +579,44 @@ 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.bitCount = 0; Demod.len = 0; + Demod.state = DEMOD_AWAITING_START_BIT; +/* 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) { - Demod.state = DEMOD_UNSYNCD; + if (v > 0) { + if (Demod.posCount > 3*2) { // max 19us between characters = 16 1/fs, max 3 etu after low phase of SOF = 24 1/fs LED_C_OFF(); + if (Demod.bitCount == 0 && Demod.len == 0) { // received SOF only, this is valid for iClass/Picopass + return true; + } else { + Demod.state = DEMOD_UNSYNCD; + } } - } else { - Demod.bitCount = 0; - Demod.posCount = 1; + } else { // start bit detected + Demod.posCount = 1; // this was the first half Demod.thisBit = v; Demod.shiftReg = 0; Demod.state = DEMOD_RECEIVING_DATA; @@ -570,38 +625,41 @@ 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) { + 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.bitCount = 0; Demod.state = DEMOD_AWAITING_START_BIT; } else { Demod.state = DEMOD_UNSYNCD; LED_C_OFF(); - if(s == 0x000) { - // This is EOF - return TRUE; + if (s == 0x000) { + // This is EOF (start, stop and all data bits == '0' + return true; } } } @@ -615,7 +673,7 @@ static RAMFUNC int Handle14443SamplesDemod(int ci, int cq) break; } - return FALSE; + return false; } @@ -624,6 +682,7 @@ 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); } @@ -635,189 +694,120 @@ 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 + * quiet: set to 'true' to disable debug output */ -static void GetSamplesFor14443Demod(int weTx, int n, int quiet) -{ - int max = 0; - int gotFrame = FALSE; - int lastRxCounter, ci, cq, samples = 0; - +static int GetSamplesFor14443bDemod(int timeout, bool quiet) { + int ret = 0; + int maxBehindBy = 0; + bool gotFrame = false; + int lastRxCounter, samples = 0; + int8_t ci, cq; + // 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); + uint16_t *dmaBuf = (uint16_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE * sizeof(uint16_t)); // Set up the demodulator for tag -> reader responses. DemodInit(receivedResponse); + // wait for last transfer to complete + while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)) + // Setup and start DMA. - FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); - int8_t *upTo = dmaBuf; - lastRxCounter = DMA_BUFFER_SIZE; + uint16_t *upTo = dmaBuf; + 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 | FPGA_HF_READER_SUBCARRIER_848_KHZ | FPGA_HF_READER_MODE_RECEIVE_IQ); 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) - { - ci = upTo[0]; - cq = upTo[1]; - upTo += 2; - if(upTo >= dmaBuf + DMA_BUFFER_SIZE) { - upTo = dmaBuf; - AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo; - AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; - } - lastRxCounter -= 2; - if(lastRxCounter <= 0) { - lastRxCounter += DMA_BUFFER_SIZE; - } + int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1); + if(behindBy > maxBehindBy) { + maxBehindBy = behindBy; + } - samples += 2; + if(behindBy < 1) continue; - if(Handle14443SamplesDemod(ci, cq)) { - gotFrame = 1; - } + ci = *upTo >> 8; + cq = *upTo; + upTo++; + lastRxCounter--; + if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning + lastRxCounter += ISO14443B_DMA_BUFFER_SIZE; } + 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 = ISO14443B_DMA_BUFFER_SIZE; // DMA Next Counter registers + } + samples++; - if(samples > n) { + if (Handle14443bSamplesDemod(ci, cq)) { + ret = Demod.len; + gotFrame = true; break; } - } - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; - if (!quiet) Dbprintf("%x %x %x", max, gotFrame, Demod.len); - //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(samples > timeout && Demod.state < DEMOD_PHASE_REF_TRAINING) { + ret = -1; + LED_C_OFF(); + break; } - 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; + FpgaDisableSscDma(); - if(c >= n) { - break; - } - } + if (!quiet) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d", maxBehindBy, samples, gotFrame, Demod.len, Demod.sumI, Demod.sumQ); + + if (ret < 0) { + return ret; } -}*/ + //Tracing + LogTrace(Demod.output, Demod.len, 0, 0, NULL, false); + + return ret; +} //----------------------------------------------------------------------------- // Transmit the command (to the tag) that was placed in ToSend[]. //----------------------------------------------------------------------------- -static void TransmitFor14443(void) +static void TransmitFor14443b(void) { - int c; - - FpgaSetupSsc(); - - while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0xff; - } - - // Signal field is ON with the appropriate Red LED - LED_D_ON(); - // Signal we are transmitting with the Green LED + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_SHALLOW_MOD); LED_B_ON(); - 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)) { - AT91C_BASE_SSC->SSC_THR = 0xff; - c++; - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; - (void)r; + for(int c = 0; c < ToSendMax; c++) { + uint8_t data = ToSend[c]; + for (int i = 0; i < 8; i++) { + uint16_t send_word = (data & 0x80) ? 0x0000 : 0xffff; + while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ; + AT91C_BASE_SSC->SSC_THR = send_word; + while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ; + AT91C_BASE_SSC->SSC_THR = send_word; + data <<= 1; } WDT_HIT(); } - - c = 0; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = ToSend[c]; - c++; - if(c >= ToSendMax) { - 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(); // Finished sending + LED_B_OFF(); } //----------------------------------------------------------------------------- // 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) { @@ -826,19 +816,14 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) ToSendReset(); - // Establish initial reference level - for(i = 0; i < 40; i++) { - ToSendStuffBit(1); - } // Send SOF for(i = 0; i < 10; i++) { ToSendStuffBit(0); } + ToSendStuffBit(1); + ToSendStuffBit(1); for(i = 0; i < len; i++) { - // Stop bits/EGT - ToSendStuffBit(1); - ToSendStuffBit(1); // Start bit ToSendStuffBit(0); // Data bits @@ -851,19 +836,18 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) } b >>= 1; } + // Stop bit + ToSendStuffBit(1); } + // Send EOF - ToSendStuffBit(1); for(i = 0; i < 10; i++) { ToSendStuffBit(0); } - for(i = 0; i < 8; i++) { - ToSendStuffBit(1); - } + ToSendStuffBit(1); - // And then a little more, to make sure that the last character makes - // it out before we switch to rx mode. - for(i = 0; i < 24; i++) { + // ensure that last byte is filled up + for(i = 0; i < 8; i++) { ToSendStuffBit(1); } @@ -872,39 +856,107 @@ 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(); - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - GetParity(cmd, len, parity); - LogTrace(cmd,len, 0, 0, parity, TRUE); + TransmitFor14443b(); + LogTrace(cmd,len, 0, 0, NULL, 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) { + LED_A_ON(); + 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 + int ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); + FpgaDisableTracing(); + if (ret < 3) { + LED_A_OFF(); + return 0; + } + // TODO: Check CRC + // copy response contents + if (response != NULL) { + memcpy(response, Demod.output, Demod.len); } + LED_A_OFF(); + return ret; } +/* 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)); + int ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); + // ATQB too short? + if (ret < 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)); + ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); + // Answer to ATTRIB too short? + if (ret < 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(FPGA_MAJOR_MODE_HF_READER); + // 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 | FPGA_HF_READER_MODE_SEND_SHALLOW_MOD); + + 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 @@ -912,11 +964,9 @@ 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); - + LED_A_ON(); uint8_t i = 0x00; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); @@ -927,116 +977,123 @@ void ReadSTMemoryIso14443(uint32_t dwLast) SpinDelay(200); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); // 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 | FPGA_HF_READER_MODE_SEND_SHALLOW_MOD); 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(); + int ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); - if (Demod.len == 0) { - DbpString("No response from tag"); - return; + if (ret < 0) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + DbpString("No response from tag"); + LEDsoff(); + 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(); + ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); if (Demod.len != 3) { - Dbprintf("Expected 3 bytes from tag, got %d", Demod.len); - return; + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + Dbprintf("Expected 3 bytes from tag, got %d", Demod.len); + LEDsoff(); + 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; + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + DbpString("CRC Error reading select response."); + LEDsoff(); + 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; + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + Dbprintf("Bad response to SELECT from Tag, aborting: %02x %02x", cmd1[1], Demod.output[0]); + LEDsoff(); + 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(); - if (Demod.len != 10) { - Dbprintf("Expected 10 bytes from tag, got %d", Demod.len); - return; + ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); + if (ret != 10) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + Dbprintf("Expected 10 bytes from tag, got %d", Demod.len); + LEDsoff(); + 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(); - if (Demod.len != 6) { // Check if we got an answer from the tag - DbpString("Expected 6 bytes from tag, got less..."); - return; + ret = GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); + if (ret != 6) { // Check if we got an answer from the tag + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + DbpString("Expected 6 bytes from tag, got less..."); + LEDsoff(); + 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++; } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); } @@ -1054,27 +1111,23 @@ void ReadSTMemoryIso14443(uint32_t dwLast) * Memory usage for this function, (within BigBuf) * Last Received command (reader->tag) - MAX_FRAME_SIZE * Last Received command (tag->reader) - MAX_FRAME_SIZE - * DMA Buffer, 1024 bytes (samples) - DMA_BUFFER_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; // TODO: set and evaluate trigger condition - + LED_A_ON(); FpgaDownloadAndGo(FPGA_BITSTREAM_HF); BigBuf_free(); clear_trace(); - set_tracing(TRUE); + set_tracing(true); // The DMA buffer, used to stream samples from the FPGA - int8_t *dmaBuf = (int8_t*) BigBuf_malloc(DMA_BUFFER_SIZE); + uint16_t *dmaBuf = (uint16_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE * sizeof(uint16_t)); int lastRxCounter; - int8_t *upTo; - int ci, cq; + uint16_t *upTo; + int8_t ci, cq; int maxBehindBy = 0; // Count of samples received so far, so that we can include timing @@ -1089,127 +1142,103 @@ 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 + // Signal field is off LED_D_OFF(); // 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 | FPGA_HF_READER_SUBCARRIER_848_KHZ | FPGA_HF_READER_MODE_SNOOP_IQ); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Setup for the DMA. - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); upTo = dmaBuf; - lastRxCounter = DMA_BUFFER_SIZE; - FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE); - uint8_t parity[MAX_PARITY_SIZE]; - LED_A_ON(); + lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); + + bool TagIsActive = false; + bool ReaderIsActive = false; + // 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 + // reader command + bool triggered = false; - 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); + int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (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); + } + + if(behindBy < 1) continue; + + ci = *upTo>>8; + cq = *upTo; + upTo++; + lastRxCounter--; + if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning again + lastRxCounter += ISO14443B_DMA_BUFFER_SIZE; + if(behindBy > (9*ISO14443B_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); break; } } - if(behindBy < 2) continue; - - ci = upTo[0]; - cq = upTo[1]; - upTo += 2; - lastRxCounter -= 2; - if(upTo >= dmaBuf + DMA_BUFFER_SIZE) { - upTo = dmaBuf; - lastRxCounter += DMA_BUFFER_SIZE; - AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; - AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE; + 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 = ISO14443B_DMA_BUFFER_SIZE; // DMA Next Counter registers + WDT_HIT(); + if(BUTTON_PRESS()) { + DbpString("cancelled"); + break; + } } - samples += 2; + samples++; if (!TagIsActive) { // no need to try decoding reader data if the tag is sending - if(Handle14443UartBit(ci & 0x01)) { - if(triggered && tracing) { - GetParity(Uart.output, Uart.byteCnt, parity); - LogTrace(Uart.output,Uart.byteCnt,samples, samples,parity,TRUE); - } - if(Uart.byteCnt==0) Dbprintf("[1] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt); - + if(Handle14443bUartBit(ci & 0x01)) { + triggered = true; + LogTrace(Uart.output, Uart.byteCnt, samples, samples, NULL, 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(Handle14443UartBit(cq & 0x01)) { - if(triggered && tracing) { - GetParity(Uart.output, Uart.byteCnt, parity); - LogTrace(Uart.output,Uart.byteCnt,samples, samples, parity, TRUE); - } - if(Uart.byteCnt==0) Dbprintf("[2] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt); - + if(Handle14443bUartBit(cq & 0x01)) { + triggered = true; + LogTrace(Uart.output, Uart.byteCnt, samples, samples, NULL, 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(); } - ReaderIsActive = (Uart.state != STATE_UNSYNCD); + ReaderIsActive = (Uart.state > STATE_GOT_FALLING_EDGE_OF_SOF); } - if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time - if(Handle14443SamplesDemod(ci & 0xFE, cq & 0xFE)) { - + if (!ReaderIsActive && triggered) { // no need to try decoding tag data if the reader is sending or not yet triggered + if (Handle14443bSamplesDemod(ci/2, cq/2) >= 0) { //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(); - + LogTrace(Demod.output, Demod.len, samples, samples, NULL, false); // And ready to receive another response. DemodReset(); } - TagIsActive = (Demod.state != DEMOD_UNSYNCD); - } - - WDT_HIT(); - - if(!tracing) { - DbpString("Reached trace limit"); - break; + 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(); - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; DbpString("Snoop statistics:"); Dbprintf(" Max behind by: %i", maxBehindBy); Dbprintf(" Uart State: %x", Uart.state); Dbprintf(" Uart ByteCnt: %i", Uart.byteCnt); Dbprintf(" Uart ByteCntMax: %i", Uart.byteCntMax); Dbprintf(" Trace length: %i", BigBuf_get_traceLen()); + LEDsoff(); } @@ -1227,41 +1256,36 @@ void RAMFUNC SnoopIso14443(void) */ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[]) { + LED_A_ON(); 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); - } - - if(!GETBIT(GPIO_LED_D)) - { - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); - - // 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); - } + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - CodeAndTransmit14443bAsReader(data, datalen); + // switch field on and give tag some time to power up + LED_D_ON(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_SHALLOW_MOD); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + SpinDelay(10); + + if (datalen){ + set_tracing(true); + + CodeAndTransmit14443bAsReader(data, datalen); + + if (recv) { + int ret = GetSamplesFor14443bDemod(5*RECEIVE_SAMPLES_TIMEOUT, true); + FpgaDisableTracing(); + uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE); + cmd_send(CMD_ACK, ret, 0, 0, Demod.output, iLen); + } - 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); + FpgaDisableTracing(); } - if(!powerfield) - { + + if (!powerfield) { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); } + + LED_A_OFF(); }