X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/99cf19d9e8b450422f61c467751e8570537ab718..aacb96d7ed1723663fddd4e2611c22c971442cbd:/armsrc/iso14443b.c?ds=inline diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index ee7f18f2..9d033f61 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -13,12 +13,15 @@ #include "apps.h" #include "util.h" #include "string.h" - #include "iso14443crc.h" - -#define RECEIVE_SAMPLES_TIMEOUT 2000 +#include "common.h" +#define RECEIVE_SAMPLES_TIMEOUT 600000 #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 // a UART kind of thing that's implemented in software. When we get a @@ -266,6 +269,8 @@ static void UartReset() Uart.state = STATE_UNSYNCD; Uart.byteCnt = 0; Uart.bitCnt = 0; + Uart.posCnt = 0; + memset(Uart.output, 0x00, MAX_FRAME_SIZE); } @@ -321,10 +326,14 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) //----------------------------------------------------------------------------- void SimulateIso14443bTag(void) { - // the only commands we understand is REQB, AFI=0, Select All, N=0: - static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; - // ... and REQB, AFI=0, Normal Request, N=0: - static const uint8_t cmd2[] = { 0x05, 0x00, 0x00, 0x71, 0xFF }; + // 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, @@ -333,8 +342,10 @@ void SimulateIso14443bTag(void) 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 parity[MAX_PARITY_SIZE]; + uint8_t parity[MAX_PARITY_SIZE] = {0x00}; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); @@ -358,6 +369,12 @@ void SimulateIso14443bTag(void) 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(); @@ -366,14 +383,12 @@ void SimulateIso14443bTag(void) for(;;) { - if(!GetIso14443bCommandFromReader(receivedCmd, &len)) { - Dbprintf("button pressed, received %d commands", cmdsRecvd); - break; + if (!GetIso14443bCommandFromReader(receivedCmd, &len)) { + Dbprintf("button pressed, received %d commands", cmdsRecvd); + break; } - if (tracing) { - LogTrace(receivedCmd, len, 0, 0, parity, TRUE); - } + LogTrace(receivedCmd, len, 0, 0, parity, TRUE); // Good, look at the command now. if ( (len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len) == 0) @@ -382,18 +397,33 @@ void SimulateIso14443bTag(void) 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 uint8_t b1, b2; - 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"); + 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; } cmdsRecvd++; @@ -430,7 +460,7 @@ void SimulateIso14443bTag(void) AT91C_BASE_SSC->SSC_THR = respCode[i++]; FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR; } - if(BUTTON_PRESS()) break; + if(BUTTON_PRESS()) break; } // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again: @@ -443,10 +473,10 @@ void SimulateIso14443bTag(void) } } - // trace the response: - if (tracing) LogTrace(resp, respLen, 0, 0, parity, FALSE); + LogTrace(resp, respLen, 0, 0, parity, FALSE); } - //FpgaDisableSscDma(); + FpgaDisableSscDma(); + set_tracing(FALSE); } //============================================================================= @@ -493,9 +523,14 @@ static struct { * false if we are still waiting for some more * */ + #define abs(x) ( ((x)<0) ? -(x) : (x) ) static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) { - int v; + int v = 0; + int ai = abs(ci); + int aq = abs(cq); + int halfci = (ai >> 1); + int halfcq = (aq >> 1); // The soft decision on the bit uses an estimate of just the // quadrant of the reference angle, not the exact angle. @@ -514,50 +549,12 @@ 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); \ - } \ - } \ - } \ - } - + v = MAX(ai, aq) + MIN(halfci, halfcq); \ +} + + switch(Demod.state) { case DEMOD_UNSYNCD: CHECK_FOR_SUBCARRIER(); @@ -571,28 +568,30 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) case DEMOD_PHASE_REF_TRAINING: if(Demod.posCount < 8) { + //if(Demod.posCount < 10*2) { CHECK_FOR_SUBCARRIER(); if (v > SUBCARRIER_DETECT_THRESHOLD) { // set the reference phase (will code a logic '1') by averaging over 32 1/fs. // note: synchronization time > 80 1/fs - Demod.sumI += ci; - Demod.sumQ += cq; + Demod.sumI += ci; + Demod.sumQ += cq; Demod.posCount++; } else { // subcarrier lost - Demod.state = DEMOD_UNSYNCD; + Demod.state = DEMOD_UNSYNCD; } } else { - Demod.state = DEMOD_AWAITING_FALLING_EDGE_OF_SOF; + Demod.state = DEMOD_AWAITING_FALLING_EDGE_OF_SOF; } break; case DEMOD_AWAITING_FALLING_EDGE_OF_SOF: MAKE_SOFT_DECISION(); - if(v < 0) { // logic '0' detected + //Dbprintf("ICE: %d %d %d %d %d", v, Demod.sumI, Demod.sumQ, ci, cq ); + if(v <= 0) { // logic '0' detected Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF; Demod.posCount = 0; // start of SOF sequence } else { - if(Demod.posCount > 200/4) { // maximum length of TR1 = 200 1/fs + if(Demod.posCount > 25*2) { // maximum length of TR1 = 200 1/fs Demod.state = DEMOD_UNSYNCD; } } @@ -603,7 +602,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) Demod.posCount++; MAKE_SOFT_DECISION(); if(v > 0) { - if(Demod.posCount < 9*2) { // low phase of SOF too short (< 9 etu). Note: spec is >= 10, but FPGA tends to "smear" edges + if(Demod.posCount < 10*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 @@ -616,7 +615,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) */ } } else { - if(Demod.posCount > 12*2) { // low phase of SOF too long (> 12 etu) + if(Demod.posCount > 13*2) { // low phase of SOF too long (> 12 etu) Demod.state = DEMOD_UNSYNCD; LED_C_OFF(); } @@ -675,7 +674,7 @@ 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; } } } @@ -688,7 +687,6 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) LED_C_OFF(); break; } - return FALSE; } @@ -699,6 +697,11 @@ static void DemodReset() Demod.len = 0; Demod.state = DEMOD_UNSYNCD; Demod.posCount = 0; + Demod.sumI = 0; + Demod.sumQ = 0; + Demod.bitCount = 0; + Demod.thisBit = 0; + Demod.shiftReg = 0; memset(Demod.output, 0x00, MAX_FRAME_SIZE); } @@ -723,28 +726,25 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) // Allocate memory from BigBuf for some buffers // free all previous allocations first BigBuf_free(); - + + // And put the FPGA in the appropriate mode + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); + // The response (tag -> reader) that we're receiving. - uint8_t *resp = BigBuf_malloc(MAX_FRAME_SIZE); + // Set up the demodulator for tag -> reader responses. + DemodInit(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); - // Set up the demodulator for tag -> reader responses. - DemodInit(resp); - // Setup and start DMA. FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); - + int8_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); - SpinDelayUs(151); // T0 time between reader send, tag answer. 151us. - for(;;) { int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR; if(behindBy > max) max = behindBy; @@ -760,16 +760,16 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) } lastRxCounter -= 2; if(lastRxCounter <= 0) { - lastRxCounter += ISO14443B_DMA_BUFFER_SIZE; + lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; } samples += 2; - if(Handle14443bSamplesDemod(ci, cq)) { - gotFrame = TRUE; + // + gotFrame = Handle14443bSamplesDemod(ci , cq ); + if ( gotFrame ) break; } - } if(samples > n || gotFrame) { break; @@ -778,10 +778,20 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; - 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 && Demod.len == 0) { + 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]; + if (Demod.len > 0) { + uint8_t parity[MAX_PARITY_SIZE] = {0x00}; LogTrace(Demod.output, Demod.len, 0, 0, parity, FALSE); } } @@ -795,7 +805,7 @@ static void TransmitFor14443b(void) int c; FpgaSetupSsc(); - + while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { AT91C_BASE_SSC->SSC_THR = 0xff; } @@ -805,7 +815,7 @@ static void TransmitFor14443b(void) // Signal we are transmitting with the Green LED 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; @@ -853,7 +863,7 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) ToSendStuffBit(1); } // Send SOF - for(i = 0; i < 10; i++) { + for(i = 0; i < 11; i++) { ToSendStuffBit(0); } @@ -876,7 +886,7 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) } // Send EOF ToSendStuffBit(1); - for(i = 0; i < 10; i++) { + for(i = 0; i < 11; i++) { ToSendStuffBit(0); } for(i = 0; i < 8; i++) { @@ -885,7 +895,7 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) // 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++) { + for(i = 0; i < 10; i++) { ToSendStuffBit(1); } @@ -907,6 +917,103 @@ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) } } +/* Sends an APDU to the tag + * TODO: check CRC and preamble + */ +int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response) +{ + uint8_t message_frame[message_length + 4]; + // PCB + message_frame[0] = 0x0A | pcb_blocknum; + pcb_blocknum ^= 1; + // CID + message_frame[1] = 0; + // INF + memcpy(message_frame + 2, message, message_length); + // EDC (CRC) + ComputeCrc14443(CRC_14443_B, message_frame, message_length + 2, &message_frame[message_length + 2], &message_frame[message_length + 3]); + // send + CodeAndTransmit14443bAsReader(message_frame, message_length + 4); + // get response + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT*100, TRUE); + if(Demod.len < 3) + { + return 0; + } + // TODO: Check CRC + // copy response contents + if(response != NULL) + { + memcpy(response, Demod.output, Demod.len); + } + return Demod.len; +} + +/* Perform the ISO 14443 B Card Selection procedure + * Currently does NOT do any collision handling. + * It expects 0-1 cards in the device's range. + * TODO: Support multiple cards (perform anticollision) + * TODO: Verify CRC checksums + */ +int iso14443b_select_card() +{ + // WUPB command (including CRC) + // Note: WUPB wakes up all tags, REQB doesn't wake up tags in HALT state + static const uint8_t wupb[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; + // ATTRIB command (with space for CRC) + uint8_t attrib[] = { 0x1D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00}; + + // first, wake up the tag + CodeAndTransmit14443bAsReader(wupb, sizeof(wupb)); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + // ATQB too short? + if (Demod.len < 14) + { + return 2; + } + + // select the tag + // copy the PUPI to ATTRIB + memcpy(attrib + 1, Demod.output + 1, 4); + /* copy the protocol info from ATQB (Protocol Info -> Protocol_Type) into + ATTRIB (Param 3) */ + attrib[7] = Demod.output[10] & 0x0F; + ComputeCrc14443(CRC_14443_B, attrib, 9, attrib + 9, attrib + 10); + CodeAndTransmit14443bAsReader(attrib, sizeof(attrib)); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + // Answer to ATTRIB too short? + if(Demod.len < 3) + { + return 2; + } + // reset PCB block number + pcb_blocknum = 0; + return 1; +} + +// Set up ISO 14443 Type B communication (similar to iso14443a_setup) +void iso14443b_setup() { + + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + + BigBuf_free(); + // Set up the synchronous serial port + FpgaSetupSsc(); + // connect Demodulated Signal to ADC: + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + + // Signal field is on with the appropriate LED + LED_D_ON(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD); + + //SpinDelay(100); + + // Start the timer + //StartCountSspClk(); + + DemodReset(); + UartReset(); +} //----------------------------------------------------------------------------- // Read a SRI512 ISO 14443B tag. @@ -949,6 +1056,7 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) if (Demod.len == 0) { DbpString("No response from tag"); + set_tracing(FALSE); return; } else { Dbprintf("Randomly generated Chip ID (+ 2 byte CRC): %02x %02x %02x", @@ -964,17 +1072,20 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); if (Demod.len != 3) { Dbprintf("Expected 3 bytes from tag, got %d", Demod.len); + set_tracing(FALSE); 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."); + set_tracing(FALSE); 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: %02x %02x", cmd1[1], Demod.output[0]); + set_tracing(FALSE); return; } @@ -986,6 +1097,7 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); if (Demod.len != 10) { Dbprintf("Expected 10 bytes from tag, got %d", Demod.len); + set_tracing(FALSE); return; } // The check the CRC of the answer (use cmd1 as temporary variable): @@ -1033,6 +1145,8 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) } i++; } + + set_tracing(FALSE); } @@ -1099,7 +1213,7 @@ void RAMFUNC SnoopIso14443b(void) upTo = dmaBuf; lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); - uint8_t parity[MAX_PARITY_SIZE]; + uint8_t parity[MAX_PARITY_SIZE] = {0x00}; bool TagIsActive = FALSE; bool ReaderIsActive = FALSE; @@ -1128,10 +1242,12 @@ void RAMFUNC SnoopIso14443b(void) Dbprintf("blew circular buffer! behindBy=%d", behindBy); break; } + if(!tracing) { - DbpString("Reached trace limit"); + DbpString("Trace full"); break; } + if(BUTTON_PRESS()) { DbpString("cancelled"); break; @@ -1141,50 +1257,48 @@ void RAMFUNC SnoopIso14443b(void) samples += 2; if (!TagIsActive) { // no need to try decoding reader data if the tag is sending - if(Handle14443bUartBit(ci & 0x01)) { - if(triggered && tracing) { + if (Handle14443bUartBit(ci & 0x01)) { + if ( triggered) LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE); + + /* And ready to receive another command. */ + UartReset(); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DemodReset(); } - /* 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(Handle14443bUartBit(cq & 0x01)) { - if(triggered && tracing) { + if (Handle14443bUartBit(cq & 0x01)) { + if (triggered) LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE); - } - /* And ready to receive another command. */ - UartReset(); - /* And also reset the demod code, which might have been */ - /* false-triggered by the commands from the reader. */ - DemodReset(); - } + + /* And ready to receive another command. */ + UartReset(); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DemodReset(); + } ReaderIsActive = (Uart.state > STATE_GOT_FALLING_EDGE_OF_SOF); } if(!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)) { + // is this | 0x01 the error? & 0xfe in https://github.com/Proxmark/proxmark3/issues/103 + if(Handle14443bSamplesDemod(ci & 0xfe, cq & 0xfe)) { - //Use samples as a time measurement - if(tracing) - { - //uint8_t parity[MAX_PARITY_SIZE]; + //Use samples as a time measurement LogTrace(Demod.output, Demod.len, samples, samples, parity, FALSE); - } - triggered = TRUE; - // And ready to receive another response. - DemodReset(); - } + triggered = TRUE; + + // And ready to receive another response. + DemodReset(); + } TagIsActive = (Demod.state > DEMOD_GOT_FALLING_EDGE_OF_SOF); } - } FpgaDisableSscDma(); LEDsoff(); + AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; DbpString("Snoop statistics:"); Dbprintf(" Max behind by: %i", maxBehindBy); @@ -1192,6 +1306,7 @@ void RAMFUNC SnoopIso14443b(void) Dbprintf(" Uart ByteCnt: %i", Uart.byteCnt); Dbprintf(" Uart ByteCntMax: %i", Uart.byteCntMax); Dbprintf(" Trace length: %i", BigBuf_get_traceLen()); + set_tracing(FALSE); } @@ -1209,29 +1324,26 @@ void RAMFUNC SnoopIso14443b(void) */ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[]) { - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - BigBuf_free(); - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); - + iso14443b_setup(); + if ( datalen == 0 && recv == 0 && powerfield == 0){ - clear_trace(); - } else { + + } else { set_tracing(TRUE); CodeAndTransmit14443bAsReader(data, datalen); } - if(recv) { - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + if (recv) { + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, FALSE); 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); + FpgaDisableSscDma(); + set_tracing(FALSE); LED_D_OFF(); } - - FpgaDisableSscDma(); }