X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/b86225188edcbcd6af6a545920115d67130882bc..f80cd7e687a37231ca47d3d7ca75a3df46f5bfaf:/armsrc/iso14443b.c?ds=sidebyside diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index be43d47e..ed035d3a 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -11,7 +11,8 @@ #include "iso14443b.h" #ifndef FWT_TIMEOUT_14B -# define FWT_TIMEOUT_14B 60000 +// defaults to 2000ms +# define FWT_TIMEOUT_14B 35312 #endif #ifndef ISO14443B_DMA_BUFFER_SIZE # define ISO14443B_DMA_BUFFER_SIZE 256 @@ -37,29 +38,19 @@ // 4sample #define SEND4STUFFBIT(x) ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x); //#define SEND4STUFFBIT(x) ToSendStuffBit(x); + // iceman, this threshold value, what makes 8 a good amplituted for this IQ values? +#ifndef SUBCARRIER_DETECT_THRESHOLD +# define SUBCARRIER_DETECT_THRESHOLD 8 +#endif +static void iso14b_set_timeout(uint32_t timeout); +static void iso14b_set_maxframesize(uint16_t size); static void switch_off(void); // the block number for the ISO14443-4 PCB (used with APDUs) static uint8_t pcb_blocknum = 0; - static uint32_t iso14b_timeout = FWT_TIMEOUT_14B; -// param timeout is in ftw_ -void iso14b_set_timeout(uint32_t timeout) { - // 9.4395us = 1etu. - // clock is about 1.5 us - iso14b_timeout = timeout; - if(MF_DBGLEVEL >= 2) Dbprintf("ISO14443B Timeout set to %ld fwt", iso14b_timeout); -} -static void switch_off(void){ - if (MF_DBGLEVEL > 3) Dbprintf("switch_off"); - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(100); - FpgaDisableSscDma(); - set_tracing(FALSE); - LEDsoff(); -} //============================================================================= // An ISO 14443 Type B tag. We listen for commands from the reader, using @@ -150,6 +141,44 @@ static void DemodInit(uint8_t *data) { // memset(Demod.output, 0x00, MAX_FRAME_SIZE); } + +/* +* 9.4395 us = 1 ETU and clock is about 1.5 us +* 13560000Hz +* 1000ms/s +* timeout in ETUs (time to transfer 1 bit, 9.4395 us) +* +* Formula to calculate FWT (in ETUs) by timeout (in ms): +* fwt = 13560000 * 1000 / (8*16) * timeout; +* Sample: 3sec == 3000ms +* 13560000 * 1000 / (8*16) * 3000 == +* 13560000000 / 384000 = 35312 FWT +* @param timeout is in frame wait time, fwt, measured in ETUs +*/ +static void iso14b_set_timeout(uint32_t timeout) { + #define MAX_TIMEOUT 40542464 // 13560000Hz * 1000ms / (2^32-1) * (8*16) + if(timeout > MAX_TIMEOUT) + timeout = MAX_TIMEOUT; + + iso14b_timeout = timeout; + if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443B Timeout set to %ld fwt", iso14b_timeout); +} +static void iso14b_set_maxframesize(uint16_t size) { + if (size > 256) + size = MAX_FRAME_SIZE; + + Uart.byteCntMax = size; + if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443B Max frame size set to %d bytes", Uart.byteCntMax); +} +static void switch_off(void){ + if (MF_DBGLEVEL > 3) Dbprintf("switch_off"); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + SpinDelay(100); + FpgaDisableSscDma(); + set_tracing(FALSE); + LEDsoff(); +} + void AppendCrc14443b(uint8_t* data, int len) { ComputeCrc14443(CRC_14443_B, data, len, data+len, data+len+1); } @@ -187,16 +216,19 @@ static void CodeIso14443bAsTag(const uint8_t *cmd, int len) { * -TO VERIFY THIS BELOW- * The mode FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK which we use to simulate tag * works like this: - * - A 1-bit input to the FPGA becomes 8 pulses at 847.5kHz (9.44µS) - * - A 0-bit input to the FPGA becomes an unmodulated time of 9.44µS - * + * - A 1-bit input to the FPGA becomes 8 pulses at 847.5kHz (1.18µS / pulse) == 9.44us + * - A 0-bit input to the FPGA becomes an unmodulated time of 1.18µS or does it become 8 nonpulses for 9.44us * + * FPGA doesn't seem to work with ETU. It seems to work with pulse / duration instead. * * Card sends data ub 847.e kHz subcarrier - * 848k = 9.44µS = 128 fc - * 424k = 18.88µS = 256 fc - * 212k = 37.76µS = 512 fc - * 106k = 75.52µS = 1024 fc + * subcar |duration| FC division + * -------+--------+------------ + * 106kHz | 9.44µS | FC/128 + * 212kHz | 4.72µS | FC/64 + * 424kHz | 2.36µS | FC/32 + * 848kHz | 1.18µS | FC/16 + * -------+--------+------------ * * Reader data transmission: * - no modulation ONES @@ -208,7 +240,7 @@ static void CodeIso14443bAsTag(const uint8_t *cmd, int len) { * Card data transmission * - TR1 * - SOF - * - data (each bytes is: 1startbit,8bits, 1stopbit) + * - data (each bytes is: 1startbit, 8bits, 1stopbit) * - CRC_B * - EOF * @@ -251,13 +283,14 @@ static void CodeIso14443bAsTag(const uint8_t *cmd, int len) { // Data bits b = cmd[i]; for(j = 0; j < 8; ++j) { - if(b & 1) { - SEND4STUFFBIT(1); - //ToSendStuffBit(1); - } else { - SEND4STUFFBIT(0); - //ToSendStuffBit(0); - } + // if(b & 1) { + // SEND4STUFFBIT(1); + // //ToSendStuffBit(1); + // } else { + // SEND4STUFFBIT(0); + // //ToSendStuffBit(0); + // } + SEND4STUFFBIT( b & 1 ); b >>= 1; } @@ -298,9 +331,9 @@ static void CodeIso14443bAsTag(const uint8_t *cmd, int len) { * false if we are still waiting for some more */ static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) { - switch(Uart.state) { + switch (Uart.state) { case STATE_UNSYNCD: - if(!bit) { + if (!bit) { // we went low, so this could be the beginning of an SOF Uart.state = STATE_GOT_FALLING_EDGE_OF_SOF; Uart.posCnt = 0; @@ -310,9 +343,9 @@ static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) { case STATE_GOT_FALLING_EDGE_OF_SOF: Uart.posCnt++; - if(Uart.posCnt == 2) { // sample every 4 1/fs in the middle of a bit - if(bit) { - if(Uart.bitCnt > 9) { + if (Uart.posCnt == 2) { // sample every 4 1/fs in the middle of a bit + if (bit) { + if (Uart.bitCnt > 9) { // we've seen enough consecutive // zeros that it's a valid SOF Uart.posCnt = 0; @@ -320,8 +353,7 @@ static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) { Uart.state = STATE_AWAITING_START_BIT; LED_A_ON(); // Indicate we got a valid SOF } else { - // didn't stay down long enough - // before going high, error + // didn't stay down long enough before going high, error Uart.state = STATE_UNSYNCD; } } else { @@ -329,10 +361,9 @@ static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) { } Uart.bitCnt++; } - if(Uart.posCnt >= 4) Uart.posCnt = 0; - if(Uart.bitCnt > 12) { - // Give up if we see too many zeros without - // a one, too. + if (Uart.posCnt >= 4) Uart.posCnt = 0; + if (Uart.bitCnt > 12) { + // Give up if we see too many zeros without a one, too. LED_A_OFF(); Uart.state = STATE_UNSYNCD; } @@ -340,10 +371,9 @@ static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) { case STATE_AWAITING_START_BIT: Uart.posCnt++; - if(bit) { - 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 + if (bit) { + 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_UNSYNCD; } } else { @@ -357,26 +387,26 @@ static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) { case STATE_RECEIVING_DATA: Uart.posCnt++; - if(Uart.posCnt == 2) { + if (Uart.posCnt == 2) { // time to sample a bit Uart.shiftReg >>= 1; - if(bit) { + if (bit) { Uart.shiftReg |= 0x200; } Uart.bitCnt++; } - if(Uart.posCnt >= 4) { + if (Uart.posCnt >= 4) { Uart.posCnt = 0; } - if(Uart.bitCnt == 10) { - if((Uart.shiftReg & 0x200) && !(Uart.shiftReg & 0x001)) + if (Uart.bitCnt == 10) { + if ((Uart.shiftReg & 0x200) && !(Uart.shiftReg & 0x001)) { // this is a data byte, with correct // start and stop bits Uart.output[Uart.byteCnt] = (Uart.shiftReg >> 1) & 0xff; Uart.byteCnt++; - if(Uart.byteCnt >= Uart.byteCntMax) { + if (Uart.byteCnt >= Uart.byteCntMax) { // Buffer overflowed, give up LED_A_OFF(); Uart.state = STATE_UNSYNCD; @@ -389,9 +419,9 @@ static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) { // this is an EOF byte LED_A_OFF(); // Finished receiving Uart.state = STATE_UNSYNCD; - if (Uart.byteCnt != 0) { - return TRUE; - } + if (Uart.byteCnt != 0) + return TRUE; + } else { // this is an error LED_A_OFF(); @@ -405,7 +435,6 @@ static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) { Uart.state = STATE_UNSYNCD; break; } - return FALSE; } @@ -427,7 +456,7 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) { StartCountSspClk(); - volatile uint8_t b; + volatile uint8_t b = 0; // clear receiving shift register and holding register // What does this loop do? Is it TR1? @@ -441,7 +470,6 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) { // Now run a `software UART' on the stream of incoming samples. UartInit(received); - b = 0; uint8_t mask; while( !BUTTON_PRESS() ) { WDT_HIT(); @@ -464,15 +492,14 @@ void ClearFpgaShiftingRegisters(void){ volatile uint8_t b; // clear receiving shift register and holding register - while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); + while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) {}; b = AT91C_BASE_SSC->SSC_RHR; (void) b; - while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); + while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) {}; b = AT91C_BASE_SSC->SSC_RHR; (void) b; - - + // wait for the FPGA to signal fdt_indicator == 1 (the FPGA is ready to queue new data in its delay line) for (uint8_t j = 0; j < 5; j++) { // allow timeout - better late than never while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); @@ -716,13 +743,9 @@ void SimulateIso14443bTag(uint32_t pupi) { * false if we are still waiting for some more * */ - // iceman, this threshold value, what makes 8 a good amplituted for this IQ values? -#ifndef SUBCARRIER_DETECT_THRESHOLD -# define SUBCARRIER_DETECT_THRESHOLD 6 -#endif - static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) { - int v = 0, myI = 0, myQ = 0; + int v = 0, myI = ABS(ci), myQ = ABS(cq); + // 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() { \ @@ -774,8 +797,6 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) { //note: couldn't we just use MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2) from common.h - marshmellow #define CHECK_FOR_SUBCARRIER() { \ - myI = ABS(ci); \ - myQ = ABS(cq); \ v = MAX(myI, myQ) + (MIN(myI, myQ) >> 1); \ } @@ -783,9 +804,9 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) { case DEMOD_UNSYNCD: CHECK_FOR_SUBCARRIER(); - + // subcarrier detected - if(v > SUBCARRIER_DETECT_THRESHOLD) { + if (v > SUBCARRIER_DETECT_THRESHOLD) { Demod.state = DEMOD_PHASE_REF_TRAINING; Demod.sumI = ci; Demod.sumQ = cq; @@ -794,7 +815,7 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) { break; case DEMOD_PHASE_REF_TRAINING: - if(Demod.posCount < 8) { + if (Demod.posCount < 8) { CHECK_FOR_SUBCARRIER(); @@ -817,7 +838,7 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) { MAKE_SOFT_DECISION(); - if(v < 0) { // logic '0' detected + if (v < 0) { // logic '0' detected Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF; Demod.posCount = 0; // start of SOF sequence } else { @@ -832,13 +853,13 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) { MAKE_SOFT_DECISION(); - if(v > 0) { + if (v > 0) { // low phase of SOF too short (< 9 etu). Note: spec is >= 10, but FPGA tends to "smear" edges - if(Demod.posCount < 8*2) { + if (Demod.posCount < 8*2) { Demod.state = DEMOD_UNSYNCD; } else { LED_C_ON(); // Got SOF - Demod.startTime = GetCountSspClk(); + //Demod.startTime = GetCountSspClk(); Demod.state = DEMOD_AWAITING_START_BIT; Demod.posCount = 0; Demod.len = 0; @@ -884,7 +905,7 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) { Demod.thisBit += v; Demod.shiftReg >>= 1; - // logic '1' + // OR in a logic '1' if (Demod.thisBit > 0) Demod.shiftReg |= 0x200; ++Demod.bitCount; @@ -895,18 +916,19 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) { uint16_t s = Demod.shiftReg; // stop bit == '1', start bit == '0' - if((s & 0x200) && !(s & 0x001)) { - uint8_t b = (s >> 1); - Demod.output[Demod.len] = b; + if ((s & 0x200) && (s & 0x001) == 0 ) { + // left shift to drop the startbit + Demod.output[Demod.len] = (s >> 1) & 0xFF; ++Demod.len; Demod.state = DEMOD_AWAITING_START_BIT; } else { + // this one is a bit hard, either its a correc byte or its unsynced. Demod.state = DEMOD_UNSYNCD; - Demod.endTime = GetCountSspClk(); + //Demod.endTime = GetCountSspClk(); LED_C_OFF(); // This is EOF (start, stop and all data bits == '0' - if(s == 0) return TRUE; + if (s == 0) return TRUE; } } Demod.posCount = 0; @@ -929,7 +951,7 @@ static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) { static void GetTagSamplesFor14443bDemod() { bool gotFrame = FALSE, finished = FALSE; int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; - int ci = 0, cq = 0, samples = 0; + int ci = 0, cq = 0; uint32_t time_0 = 0, time_stop = 0; BigBuf_free(); @@ -963,8 +985,6 @@ static void GetTagSamplesFor14443bDemod() { ci = upTo[0] >> 1; cq = upTo[1] >> 1; upTo += 2; - samples += 2; - lastRxCounter -= 2; // restart DMA buffer to receive again. @@ -976,7 +996,6 @@ static void GetTagSamplesFor14443bDemod() { } // https://github.com/Proxmark/proxmark3/issues/103 - //gotFrame = Handle14443bTagSamplesDemod(ci & 0xfe, cq & 0xfe); gotFrame = Handle14443bTagSamplesDemod(ci, cq); time_stop = GetCountSspClk() - time_0; @@ -984,21 +1003,23 @@ static void GetTagSamplesFor14443bDemod() { } FpgaDisableSscDma(); - + + if ( upTo ) upTo = NULL; + if (MF_DBGLEVEL >= 3) { - Dbprintf("time_stop = %u PDC_RCR = %u", time_stop, AT91C_BASE_PDC_SSC->PDC_RCR); - Dbprintf("#Samples = %d, Demod.state = %d, Demod.len = %u", - samples, + Dbprintf("Demod.state = %d, Demod.len = %u, PDC_RCR = %u", Demod.state, - Demod.len + Demod.len, + AT91C_BASE_PDC_SSC->PDC_RCR ); } + // print the last batch of IQ values from FPGA if (MF_DBGLEVEL == 4) Dbhexdump(ISO14443B_DMA_BUFFER_SIZE, (uint8_t *)dmaBuf, FALSE); if ( Demod.len > 0 ) - LogTrace(Demod.output, Demod.len, Demod.startTime, Demod.endTime, NULL, FALSE); + LogTrace(Demod.output, Demod.len, time_0, time_stop, NULL, FALSE); } @@ -1055,8 +1076,7 @@ static void TransmitFor14443b_AsReader(void) { // Code a layer 2 command (string of octets, including CRC) into ToSend[], // so that it is ready to transmit to the tag using TransmitFor14443b(). //----------------------------------------------------------------------------- -static void CodeIso14443bAsReader(const uint8_t *cmd, int len) -{ +static void CodeIso14443bAsReader(const uint8_t *cmd, int len) { /* * Reader data transmission: * - no modulation ONES @@ -1092,14 +1112,24 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) ToSendStuffBit(0); // Data bits b = cmd[i]; - if ( b & 1 ) ToSendStuffBit(1); else ToSendStuffBit(0); - if ( (b>>1) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); - if ( (b>>2) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); - if ( (b>>3) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); - if ( (b>>4) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); - if ( (b>>5) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); - if ( (b>>6) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); - if ( (b>>7) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + // if ( b & 1 ) ToSendStuffBit(1); else ToSendStuffBit(0); + // if ( (b>>1) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + // if ( (b>>2) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + // if ( (b>>3) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + // if ( (b>>4) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + // if ( (b>>5) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + // if ( (b>>6) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + // if ( (b>>7) & 1) ToSendStuffBit(1); else ToSendStuffBit(0); + + ToSendStuffBit( b & 1); + ToSendStuffBit( (b>>1) & 1); + ToSendStuffBit( (b>>2) & 1); + ToSendStuffBit( (b>>3) & 1); + ToSendStuffBit( (b>>4) & 1); + ToSendStuffBit( (b>>5) & 1); + ToSendStuffBit( (b>>6) & 1); + ToSendStuffBit( (b>>7) & 1); + // Stop bit ToSendStuffBit(1); // EGT extra guard time @@ -1125,19 +1155,19 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) } -/** - Convenience function to encode, transmit and trace iso 14443b comms - **/ +/* +* Convenience function to encode, transmit and trace iso 14443b comms +*/ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) { + + uint32_t time_start = GetCountSspClk(); CodeIso14443bAsReader(cmd, len); - - uint32_t time_start = GetCountSspClk(); TransmitFor14443b_AsReader(); - + if(trigger) LED_A_ON(); - + LogTrace(cmd, len, time_start, GetCountSspClk()-time_start, NULL, TRUE); } @@ -1283,10 +1313,23 @@ uint8_t iso14443b_select_card(iso14b_card_select_t *card ) ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]); if ( crc[0] != Demod.output[1] || crc[1] != Demod.output[2] ) return 3; - - // CID + if (card) { + + // CID card->cid = Demod.output[0]; + + // MAX FRAME + uint16_t maxFrame = card->atqb[5] >> 4; + if (maxFrame < 5) maxFrame = 8 * maxFrame + 16; + else if (maxFrame == 5) maxFrame = 64; + else if (maxFrame == 6) maxFrame = 96; + else if (maxFrame == 7) maxFrame = 128; + else if (maxFrame == 8) maxFrame = 256; + else maxFrame = 257; + iso14b_set_maxframesize(maxFrame); + + // FWT uint8_t fwt = card->atqb[6] >> 4; if ( fwt < 16 ){ uint32_t fwt_time = (302 << fwt); @@ -1517,16 +1560,13 @@ static void iso1444b_setup_snoop(void){ void RAMFUNC SnoopIso14443b(void) { uint32_t time_0 = 0, time_start = 0, time_stop = 0; - + int ci = 0, cq = 0; + int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; + // 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 - int ci, cq; - int maxBehindBy = 0; - //int behindBy = 0; - int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; - + bool triggered = TRUE; // TODO: set and evaluate trigger condition bool TagIsActive = FALSE; bool ReaderIsActive = FALSE; @@ -1549,26 +1589,10 @@ void RAMFUNC SnoopIso14443b(void) { for(;;) { WDT_HIT(); - - /* iceman: the & (and) should do what? - ISO14443B_DMA_BUFFER_SIZE = 256 - Should it be a "mod 255" ? - - (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1); - - */ - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & RECEIVE_MASK; - if ( behindBy > maxBehindBy ) - maxBehindBy = behindBy; - - // this one needs the inner loop from tr - if ( behindBy < 2 ) continue; - ci = upTo[0]; cq = upTo[1]; - upTo += 2; - + upTo += 2; lastRxCounter -= 2; if (upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { @@ -1576,21 +1600,14 @@ void RAMFUNC SnoopIso14443b(void) { 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(); - - // TODO: understand whether we can increase/decrease as we want or not? - if ( behindBy > ( 9 * ISO14443B_DMA_BUFFER_SIZE/10) ) { - Dbprintf("blew circular buffer! behindBy = %d", behindBy); - break; - } - - if(!tracing) { - DbpString("Trace full"); + + if (!tracing) { + if (MF_DBGLEVEL >= 2) DbpString("Trace full"); break; } - if(BUTTON_PRESS()) { - DbpString("cancelled"); + if (BUTTON_PRESS()) { + if (MF_DBGLEVEL >= 2) DbpString("cancelled"); break; } } @@ -1623,11 +1640,11 @@ void RAMFUNC SnoopIso14443b(void) { if (triggered) LogTrace(Uart.output, Uart.byteCnt, time_start, time_stop, 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(); + /* 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(); } else { time_start = GetCountSspClk() - time_0; } @@ -1635,10 +1652,11 @@ void RAMFUNC SnoopIso14443b(void) { LED_A_OFF(); } - if(!ReaderIsActive) { + if (!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time // is this | 0x01 the error? & 0xfe in https://github.com/Proxmark/proxmark3/issues/103 - if(Handle14443bTagSamplesDemod(ci & 0xFE, cq & 0xFE)) { + // LSB is a fpga signal bit. + if (Handle14443bTagSamplesDemod(ci >> 1, cq >> 1)) { time_stop = GetCountSspClk() - time_0; @@ -1658,12 +1676,11 @@ void RAMFUNC SnoopIso14443b(void) { switch_off(); // Snoop DbpString("Snoop statistics:"); - Dbprintf(" Max behind by: %i", maxBehindBy); Dbprintf(" Uart State: %x ByteCount: %i ByteCountMax: %i", Uart.state, Uart.byteCnt, Uart.byteCntMax); Dbprintf(" Trace length: %i", BigBuf_get_traceLen()); // free mem refs. - if ( upTo ) upTo = NULL; + if ( upTo ) upTo = NULL; // Uart.byteCntMax should be set with ATQB value.. }