X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/d71d59dbd144f9d69d4252afb1e16611a66c56c4..abb215301c68202105abf714c73eeb571de16459:/armsrc/iso14443b.c diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index 860e96f1..160ec1ec 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 +16,8 @@ #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 512 //============================================================================= // An ISO 14443 Type B tag. We listen for commands from the reader, using @@ -104,14 +96,14 @@ 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 +112,6 @@ 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; } //----------------------------------------------------------------------------- @@ -146,6 +135,9 @@ 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 +146,7 @@ static struct { * Returns: true if we received a EOF * false if we are still waiting for some more */ -static int Handle14443UartBit(int bit) +static int Handle14443bUartBit(int bit) { switch(Uart.state) { case STATE_UNSYNCD: @@ -169,9 +161,9 @@ 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; @@ -189,7 +181,7 @@ 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; @@ -199,7 +191,7 @@ static int Handle14443UartBit(int bit) 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; @@ -283,12 +275,12 @@ 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, int *len, int maxLen) { 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(); @@ -314,7 +306,7 @@ static int GetIso14443CommandFromReader(uint8_t *received, int *len, int maxLen) mask = 0x80; for(i = 0; i < 8; i++, mask >>= 1) { bit = (b & mask); - if(Handle14443UartBit(bit)) { + if(Handle14443bUartBit(bit)) { *len = Uart.byteCnt; return TRUE; } @@ -327,9 +319,13 @@ static int GetIso14443CommandFromReader(uint8_t *received, int *len, int maxLen) // Main loop of simulated tag: receive commands from reader, decide what // response to send, and send it. //----------------------------------------------------------------------------- -void SimulateIso14443Tag(void) +void SimulateIso14443bTag(void) { + // the only command we understand is REQB, AFI=0, Select All, N=0: static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; + // ... and we 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 @@ -338,10 +334,9 @@ void SimulateIso14443Tag(void) uint8_t *resp; int respLen; - uint8_t *resp1 = BigBuf_get_addr() + 800; - int resp1Len; - - uint8_t *receivedCmd = BigBuf_get_addr(); + // allocate command receive buffer + BigBuf_free(); + uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE); int len; int i; @@ -349,10 +344,12 @@ void SimulateIso14443Tag(void) int cmdsRecvd = 0; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - memset(receivedCmd, 0x44, 400); + // prepare the (only one) tag answer: CodeIso14443bAsTag(response1, sizeof(response1)); - memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax; + uint8_t *resp1 = BigBuf_malloc(ToSendMax); + memcpy(resp1, ToSend, ToSendMax); + uint16_t resp1Len = ToSendMax; // We need to listen to the high-frequency, peak-detected path. SetAdcMuxFor(GPIO_MUXSEL_HIPKD); @@ -363,7 +360,7 @@ void SimulateIso14443Tag(void) for(;;) { uint8_t b1, b2; - if(!GetIso14443CommandFromReader(receivedCmd, &len, 100)) { + if(!GetIso14443bCommandFromReader(receivedCmd, &len, 100)) { Dbprintf("button pressed, received %d commands", cmdsRecvd); break; } @@ -385,8 +382,6 @@ void SimulateIso14443Tag(void) break; } - memset(receivedCmd, 0x44, 32); - cmdsRecvd++; if(cmdsRecvd > 0x30) { @@ -444,8 +439,10 @@ static struct { 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 +453,9 @@ 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 @@ -464,7 +464,7 @@ 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; @@ -483,47 +483,87 @@ 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))) +#define CHECK_FOR_SUBCARRIER() { \ + 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) { + 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; - } else if(Demod.posCount > 100) { - // error, waited too long + Demod.posCount++; + } else { // subcarrier lost Demod.state = DEMOD_UNSYNCD; + } } else { - MAKE_SOFT_DECISION(); - if(v < 0) { Demod.state = DEMOD_AWAITING_FALLING_EDGE_OF_SOF; - Demod.posCount = 0; - } } - 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 +571,40 @@ 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; @@ -570,28 +613,30 @@ 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++; @@ -600,7 +645,7 @@ static RAMFUNC int Handle14443SamplesDemod(int ci, int cq) Demod.state = DEMOD_UNSYNCD; LED_C_OFF(); if(s == 0x000) { - // This is EOF + // This is EOF (start, stop and all data bits == '0' return TRUE; } } @@ -624,6 +669,7 @@ 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); } @@ -653,14 +699,12 @@ static void UartInit(uint8_t *data) /* * 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 @@ -671,57 +715,56 @@ static void GetSamplesFor14443Demod(int weTx, int n, int quiet) 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); 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]; @@ -731,43 +774,10 @@ static void GetSamplesFor14443Demod(int weTx, int n, int quiet) } -//----------------------------------------------------------------------------- -// 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; @@ -781,8 +791,7 @@ 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)) { @@ -817,7 +826,7 @@ 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) { @@ -873,16 +882,16 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) //----------------------------------------------------------------------------- -// Read an ISO 14443 tag. We send it some set of commands, and record the +// Read an ISO 14443B 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) +void AcquireRawAdcSamplesIso14443b(uint32_t parameter) { - uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; + uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; // REQB with AFI=0, Request All, N=0 SendRawCommand14443B(sizeof(cmd1),1,1,cmd1); } @@ -894,7 +903,7 @@ void AcquireRawAdcSamplesIso14443(uint32_t parameter) 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); @@ -904,7 +913,7 @@ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) //----------------------------------------------------------------------------- -// 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 @@ -912,7 +921,7 @@ 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); @@ -941,7 +950,7 @@ void ReadSTMemoryIso14443(uint32_t dwLast) CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); // LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); // LED_A_OFF(); if (Demod.len == 0) { @@ -959,7 +968,7 @@ void ReadSTMemoryIso14443(uint32_t dwLast) CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); // LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); // LED_A_OFF(); if (Demod.len != 3) { Dbprintf("Expected 3 bytes from tag, got %d", Demod.len); @@ -983,7 +992,7 @@ void ReadSTMemoryIso14443(uint32_t dwLast) CodeAndTransmit14443bAsReader(cmd1, 3); // Only first three bytes for this one // LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); // LED_A_OFF(); if (Demod.len != 10) { Dbprintf("Expected 10 bytes from tag, got %d", Demod.len); @@ -1015,7 +1024,7 @@ void ReadSTMemoryIso14443(uint32_t dwLast) CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); // LED_A_ON(); - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(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..."); @@ -1054,10 +1063,10 @@ 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 @@ -1071,7 +1080,7 @@ 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; @@ -1089,10 +1098,10 @@ 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( @@ -1103,10 +1112,9 @@ void RAMFUNC SnoopIso14443(void) // 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; @@ -1114,50 +1122,56 @@ void RAMFUNC SnoopIso14443(void) // 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=0x%x", behindBy); + break; + } + if(!tracing) { + DbpString("Reached trace limit"); + break; + } + if(BUTTON_PRESS()) { + DbpString("cancelled"); + break; + } } samples += 2; if (!TagIsActive) { // no need to try decoding reader data if the tag is sending - if(Handle14443UartBit(ci & 0x01)) { + if(Handle14443bUartBit(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); - /* 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(Handle14443bUartBit(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); - /* And ready to receive another command. */ UartReset(); /* And also reset the demod code, which might have been */ @@ -1168,7 +1182,7 @@ void RAMFUNC SnoopIso14443(void) } 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(Handle14443bSamplesDemod(ci & 0xFE, cq & 0xFE)) { //Use samples as a time measurement if(tracing) @@ -1178,31 +1192,17 @@ void RAMFUNC SnoopIso14443(void) LogTrace(Demod.output, Demod.len,samples, samples, parity, FALSE); } triggered = TRUE; - LED_A_OFF(); - LED_B_ON(); // And ready to receive another response. DemodReset(); } - TagIsActive = (Demod.state != DEMOD_UNSYNCD); + TagIsActive = (Demod.state > DEMOD_PHASE_REF_TRAINING); } - WDT_HIT(); - - if(!tracing) { - DbpString("Reached trace limit"); - break; - } - - 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); @@ -1225,47 +1225,39 @@ void RAMFUNC SnoopIso14443(void) * none * */ -void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield_trace, uint8_t data[]) +void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[]) { - uint8_t powerfield = powerfield_trace & 1; - uint8_t trace = powerfield_trace & 2; - if (trace){ - clear_trace(); - set_tracing(TRUE); - } FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - if(!powerfield) - { + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + FpgaSetupSsc(); + + set_tracing(TRUE); + +/* 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); - } + // if(!GETBIT(GPIO_LED_D)) { // if field is off + // FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + // // Signal field is on with the appropriate LED + // LED_D_ON(); + // SpinDelay(200); + // } CodeAndTransmit14443bAsReader(data, datalen); - if(recv) - { - GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE); + 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); } - if(!powerfield) - { + + if(!powerfield) { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); }