X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f3b83bee837314a4d2bf97bc5e17cd3705a21fde..7db36608a266a1f0f46dd4032cede2930e221d51:/armsrc/iso14443b.c diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index 76ad9e9a..f276158f 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -1,5 +1,6 @@ //----------------------------------------------------------------------------- // 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 @@ -9,15 +10,21 @@ // 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" + +#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 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 @@ -240,7 +247,7 @@ static RAMFUNC int Handle14443bUartBit(uint8_t bit) LED_A_OFF(); // Finished receiving Uart.state = STATE_UNSYNCD; if (Uart.byteCnt != 0) { - return TRUE; + return true; } } else { // this is an error @@ -256,7 +263,7 @@ static RAMFUNC int Handle14443bUartBit(uint8_t bit) break; } - return FALSE; + return false; } @@ -280,7 +287,7 @@ static void UartInit(uint8_t *data) // 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. @@ -299,20 +306,20 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) for(;;) { WDT_HIT(); - if(BUTTON_PRESS()) return FALSE; + if(BUTTON_PRESS()) return false; if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; for(uint8_t mask = 0x80; mask != 0x00; mask >>= 1) { if(Handle14443bUartBit(b & mask)) { *len = Uart.byteCnt; - return TRUE; + return true; } } } } - - return FALSE; + + return false; } //----------------------------------------------------------------------------- @@ -321,16 +328,15 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) //----------------------------------------------------------------------------- void SimulateIso14443bTag(void) { - // the only commands we understand is REQB, AFI=0, Select All, N=8: - static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; // REQB - // ... and REQB, AFI=0, Normal Request, N=0: + 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 WUPB, AFI=0, N=8: - static const uint8_t cmd3[] = { 0x05, 0x08, 0x08, 0xF9, 0xBD }; // WUPB // ... and HLTB - static const uint8_t cmd4[] = { 0x50, 0xff, 0xff, 0xff, 0xff }; // HLTB + static const uint8_t cmd3[] = { 0x50, 0xff, 0xff, 0xff, 0xff }; // HLTB // ... and ATTRIB - static const uint8_t cmd5[] = { 0x1D, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; // 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, @@ -346,7 +352,7 @@ void SimulateIso14443bTag(void) FpgaDownloadAndGo(FPGA_BITSTREAM_HF); clear_trace(); - set_tracing(TRUE); + set_tracing(true); const uint8_t *resp; uint8_t *respCode; @@ -362,18 +368,18 @@ void SimulateIso14443bTag(void) // prepare the (only one) tag answer: CodeIso14443bAsTag(response1, sizeof(response1)); uint8_t *resp1Code = BigBuf_malloc(ToSendMax); - memcpy(resp1Code, ToSend, 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); + 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; @@ -384,24 +390,20 @@ void SimulateIso14443bTag(void) break; } - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(receivedCmd, len, 0, 0, parity, TRUE); - } + LogTrace(receivedCmd, len, 0, 0, NULL, true); // Good, look at the command now. if ( (len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len) == 0) - || (len == sizeof(cmd2) && memcmp(receivedCmd, cmd2, len) == 0) - || (len == sizeof(cmd3) && memcmp(receivedCmd, cmd3, len) == 0) ) { - resp = response1; + || (len == sizeof(cmd2) && memcmp(receivedCmd, cmd2, len) == 0) ) { + resp = response1; respLen = sizeof(response1); - respCode = resp1Code; + respCode = resp1Code; respCodeLen = resp1CodeLen; - } else if ( (len == sizeof(cmd4) && receivedCmd[0] == cmd4[0]) - || (len == sizeof(cmd5) && receivedCmd[0] == cmd5[0]) ) { - resp = response2; + } else if ( (len == sizeof(cmd3) && receivedCmd[0] == cmd3[0]) + || (len == sizeof(cmd4) && receivedCmd[0] == cmd4[0]) ) { + resp = response2; respLen = sizeof(response2); - respCode = resp2Code; + respCode = resp2Code; respCodeLen = resp2CodeLen; } else { Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd); @@ -412,6 +414,7 @@ void SimulateIso14443bTag(void) if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) { // Not so good, try again. DbpString("+++CRC fail"); + } else { DbpString("CRC passes"); } @@ -439,7 +442,7 @@ void SimulateIso14443bTag(void) 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. uint16_t i = 0; @@ -459,14 +462,14 @@ void SimulateIso14443bTag(void) (void)b; } } - + // trace the response: - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(resp, respLen, 0, 0, parity, FALSE); - } - + LogTrace(resp, respLen, 0, 0, NULL, false); + } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_A_OFF(); } //============================================================================= @@ -534,54 +537,11 @@ static RAMFUNC int Handle14443bSamplesDemod(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); \ - } \ - } \ - } \ - } - +#define AMPLITUDE(ci,cq) (MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2)) switch(Demod.state) { case DEMOD_UNSYNCD: - CHECK_FOR_SUBCARRIER(); - if(v > SUBCARRIER_DETECT_THRESHOLD) { // subcarrier detected + if(AMPLITUDE(ci,cq) > SUBCARRIER_DETECT_THRESHOLD) { // subcarrier detected Demod.state = DEMOD_PHASE_REF_TRAINING; Demod.sumI = ci; Demod.sumQ = cq; @@ -591,8 +551,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) case DEMOD_PHASE_REF_TRAINING: if(Demod.posCount < 8) { - CHECK_FOR_SUBCARRIER(); - if (v > SUBCARRIER_DETECT_THRESHOLD) { + 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; @@ -675,7 +634,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) Demod.metric -= Demod.thisBit; } (Demod.metricN)++; -*/ +*/ Demod.shiftReg >>= 1; if(Demod.thisBit > 0) { // logic '1' @@ -695,7 +654,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) LED_C_OFF(); if(s == 0x000) { // This is EOF (start, stop and all data bits == '0' - return TRUE; + return true; } } } @@ -709,7 +668,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) break; } - return FALSE; + return false; } @@ -732,76 +691,82 @@ static void DemodInit(uint8_t *data) /* * Demodulate the samples we received from the tag, also log to tracebuffer - * quiet: set to 'TRUE' to disable debug output + * quiet: set to 'true' to disable debug output */ -static void GetSamplesFor14443bDemod(int n, bool quiet) +static void GetSamplesFor14443bDemod(int timeout, bool quiet) { - int max = 0; - bool gotFrame = FALSE; - int lastRxCounter, ci, cq, samples = 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(ISO14443B_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. + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); - int8_t *upTo = dmaBuf; + uint16_t *upTo = dmaBuf; lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; // Signal field is ON with the appropriate LED: 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); + 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) & (ISO14443B_DMA_BUFFER_SIZE-1)) > 2) { - ci = upTo[0]; - cq = upTo[1]; - upTo += 2; - if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { - upTo = dmaBuf; - AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo; - AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE; - } - lastRxCounter -= 2; - if(lastRxCounter <= 0) { - lastRxCounter += ISO14443B_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(Handle14443bSamplesDemod(ci, cq)) { - gotFrame = TRUE; - break; - } + 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 || gotFrame) { + if(Handle14443bSamplesDemod(ci, cq)) { + gotFrame = true; + break; + } + + if(samples > timeout && Demod.state < DEMOD_PHASE_REF_TRAINING) { + LED_C_OFF(); break; } } - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; + FpgaDisableSscDma(); - 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); + 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); //Tracing - if (tracing && Demod.len > 0) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(Demod.output, Demod.len, 0, 0, parity, FALSE); + if (Demod.len > 0) { + LogTrace(Demod.output, Demod.len, 0, 0, NULL, false); } } @@ -811,48 +776,21 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) //----------------------------------------------------------------------------- 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; - } - 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; + 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(); } - LED_B_OFF(); // Finished sending + LED_B_OFF(); } @@ -867,19 +805,14 @@ 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 @@ -892,19 +825,18 @@ 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); } @@ -920,12 +852,102 @@ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) { CodeIso14443bAsReader(cmd, len); TransmitFor14443b(); - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(cmd,len, 0, 0, parity, TRUE); + 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 + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); + FpgaDisableTracing(); + if(Demod.len < 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 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(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 14443B tag. @@ -938,6 +960,7 @@ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) //----------------------------------------------------------------------------- void ReadSTMemoryIso14443b(uint32_t dwLast) { + LED_A_ON(); uint8_t i = 0x00; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); @@ -948,24 +971,26 @@ void ReadSTMemoryIso14443b(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); clear_trace(); - set_tracing(TRUE); + set_tracing(true); // First command: wake up the tag using the INITIATE command uint8_t cmd1[] = {0x06, 0x00, 0x97, 0x5b}; CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); if (Demod.len == 0) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("No response from tag"); + LEDsoff(); return; } else { Dbprintf("Randomly generated Chip ID (+ 2 byte CRC): %02x %02x %02x", @@ -978,20 +1003,26 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) cmd1[1] = Demod.output[0]; ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]); CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); if (Demod.len != 3) { + 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]) { + 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]) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); Dbprintf("Bad response to SELECT from Tag, aborting: %02x %02x", cmd1[1], Demod.output[0]); + LEDsoff(); return; } @@ -1000,9 +1031,11 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) cmd1[0] = 0x0B; ComputeCrc14443(CRC_14443_B, cmd1, 1 , &cmd1[1], &cmd1[2]); CodeAndTransmit14443bAsReader(cmd1, 3); // Only first three bytes for this one - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); if (Demod.len != 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): @@ -1029,9 +1062,11 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) cmd1[1] = i; ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]); CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); if (Demod.len != 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): @@ -1050,6 +1085,9 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) } i++; } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); } @@ -1072,22 +1110,18 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) */ 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(ISO14443B_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 @@ -1104,64 +1138,63 @@ void RAMFUNC SnoopIso14443b(void) Dbprintf(" tag -> Reader: %i bytes", MAX_FRAME_SIZE); Dbprintf(" DMA: %i bytes", ISO14443B_DMA_BUFFER_SIZE); - // Signal field is off, no reader signal, no tag signal - LEDsoff(); + // 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 = ISO14443B_DMA_BUFFER_SIZE; FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); - uint8_t parity[MAX_PARITY_SIZE]; - bool TagIsActive = FALSE; - bool ReaderIsActive = FALSE; - + 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; + // And now we loop, receiving samples. for(;;) { - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & - (ISO14443B_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 < 2) continue; + if(behindBy < 1) continue; - ci = upTo[0]; - cq = upTo[1]; - upTo += 2; - lastRxCounter -= 2; - if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { - upTo = dmaBuf; + 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; - AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; - 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"); + if(behindBy > (9*ISO14443B_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); break; } + } + if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and + AT91C_BASE_PDC_SSC->PDC_RNCR = 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(Handle14443bUartBit(ci & 0x01)) { - if(triggered && tracing) { - LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE); - } + 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 */ @@ -1169,9 +1202,8 @@ void RAMFUNC SnoopIso14443b(void) DemodReset(); } if(Handle14443bUartBit(cq & 0x01)) { - if(triggered && tracing) { - LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE); - } + 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 */ @@ -1181,17 +1213,10 @@ void RAMFUNC SnoopIso14443b(void) 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(Handle14443bSamplesDemod(ci | 0x01, cq | 0x01)) { - + 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)) { //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; - + LogTrace(Demod.output, Demod.len, samples, samples, NULL, false); // And ready to receive another response. DemodReset(); } @@ -1201,14 +1226,13 @@ void RAMFUNC SnoopIso14443b(void) } FpgaDisableSscDma(); - LEDsoff(); - 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(); } @@ -1226,25 +1250,36 @@ void RAMFUNC SnoopIso14443b(void) */ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[]) { + LED_A_ON(); FpgaDownloadAndGo(FPGA_BITSTREAM_HF); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + + // 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); + set_tracing(true); CodeAndTransmit14443bAsReader(data, datalen); if(recv) { - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); + FpgaDisableTracing(); uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE); cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen); } - } + + FpgaDisableTracing(); + } if(!powerfield) { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); } + + LED_A_OFF(); }