From: micki.held@gmx.de Date: Wed, 19 Feb 2014 20:35:04 +0000 (+0000) Subject: - fixed iso1443a ManchesterDecoder in order to fix broken Snoop/Sniff X-Git-Tag: v1.0.0~15 X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/7bc95e2e43c0b00b72fc794b18c26a880ac19d1c - fixed iso1443a ManchesterDecoder in order to fix broken Snoop/Sniff - enhanced tracing: hf 14a list now shows meaningful timing information. With new option f it also shows the frame delay times (fdt) - small fix for hf 14b list - it used to run into the trace trailer - hf 14a sim now obeys iso14443 timing (fdt of 1172 or 1234 resp.) Note: you need to flash FPGA as well. More details in http://www.proxmark.org/forum/viewtopic.php?pid=9721#p9721 --- diff --git a/armsrc/apps.h b/armsrc/apps.h index 4e99b1aa..497692be 100644 --- a/armsrc/apps.h +++ b/armsrc/apps.h @@ -144,7 +144,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param); void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data); void ReaderIso14443a(UsbCommand * c); // Also used in iclass.c -int RAMFUNC LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader); +bool RAMFUNC LogTrace(const uint8_t * btBytes, uint8_t iLen, uint32_t iSamples, uint32_t dwParity, bool bReader); uint32_t GetParity(const uint8_t * pbtCmd, int iLen); void iso14a_set_trigger(bool enable); void iso14a_clear_trace(); diff --git a/armsrc/epa.c b/armsrc/epa.c index 1300b515..b0ae5e0d 100644 --- a/armsrc/epa.c +++ b/armsrc/epa.c @@ -423,7 +423,7 @@ int EPA_Setup() // card select information iso14a_card_select_t card_select_info; // power up the field - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); // select the card return_code = iso14443a_select_card(uid, &card_select_info, NULL); diff --git a/armsrc/fpgaloader.c b/armsrc/fpgaloader.c index e3784bf5..1e728e11 100644 --- a/armsrc/fpgaloader.c +++ b/armsrc/fpgaloader.c @@ -119,7 +119,7 @@ void FpgaSetupSsc(void) AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(8) | AT91C_SSC_MSBF | SSC_FRAME_MODE_WORDS_PER_TRANSFER(0); // clock comes from TK pin, no clock output, outputs change on falling - // edge of TK, start on rising edge of TF + // edge of TK, sample on rising edge of TK AT91C_BASE_SSC->SSC_TCMR = SSC_CLOCK_MODE_SELECT(2) | SSC_CLOCK_MODE_START(5); // tx framing is the same as the rx framing @@ -140,12 +140,12 @@ bool FpgaSetupSscDma(uint8_t *buf, int len) return false; } - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; - AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) buf; - AT91C_BASE_PDC_SSC->PDC_RCR = len; - AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) buf; - AT91C_BASE_PDC_SSC->PDC_RNCR = len; - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTEN; + AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; // Disable DMA Transfer + AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) buf; // transfer to this memory address + AT91C_BASE_PDC_SSC->PDC_RCR = len; // transfer this many bytes + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) buf; // next transfer to same memory address + AT91C_BASE_PDC_SSC->PDC_RNCR = len; // ... with same number of bytes + AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTEN; // go! return true; } diff --git a/armsrc/iclass.c b/armsrc/iclass.c index c673bb54..e876132e 100644 --- a/armsrc/iclass.c +++ b/armsrc/iclass.c @@ -1168,9 +1168,9 @@ void SimulateIClass(uint8_t arg0, uint8_t *datain) } if (tracing) { - LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE); + LogTrace(receivedCmd,len, rsamples, Uart.parityBits, TRUE); if (respdata != NULL) { - LogTrace(respdata,respsize, 0, SwapBits(GetParity(respdata,respsize),respsize), FALSE); + LogTrace(respdata,respsize, rsamples, SwapBits(GetParity(respdata,respsize),respsize), FALSE); } if(traceLen > TRACE_SIZE) { DbpString("Trace full"); @@ -1349,7 +1349,7 @@ void ReaderTransmitIClass(uint8_t* frame, int len) LED_A_ON(); // Store reader command in buffer - if (tracing) LogTrace(frame,len,0,par,TRUE); + if (tracing) LogTrace(frame,len,rsamples,par,TRUE); } //----------------------------------------------------------------------------- @@ -1407,7 +1407,8 @@ int ReaderReceiveIClass(uint8_t* receivedAnswer) { int samples = 0; if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE; - if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE); + rsamples += samples; + if (tracing) LogTrace(receivedAnswer,Demod.len,rsamples,Demod.parityBits,FALSE); if(samples == 0) return FALSE; return Demod.len; } diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index 3f775de5..ca888295 100644 --- a/armsrc/iso14443a.c +++ b/armsrc/iso14443a.c @@ -23,13 +23,93 @@ static uint32_t iso14a_timeout; uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET; -int traceLen = 0; int rsamples = 0; +int traceLen = 0; int tracing = TRUE; uint8_t trigger = 0; // the block number for the ISO14443-4 PCB static uint8_t iso14_pcb_blocknum = 0; +// +// ISO14443 timing: +// +// minimum time between the start bits of consecutive transfers from reader to tag: 7000 carrier (13.56Mhz) cycles +#define REQUEST_GUARD_TIME (7000/16 + 1) +// minimum time between last modulation of tag and next start bit from reader to tag: 1172 carrier cycles +#define FRAME_DELAY_TIME_PICC_TO_PCD (1172/16 + 1) +// bool LastCommandWasRequest = FALSE; + +// +// Total delays including SSC-Transfers between ARM and FPGA. These are in carrier clock cycles (1/13,56MHz) +// +// When the PM acts as reader and is receiving, it takes +// 3 ticks for the A/D conversion +// 10 ticks ( 16 on average) delay in the modulation detector. +// 6 ticks until the SSC samples the first data +// 7*16 ticks to complete the transfer from FPGA to ARM +// 8 ticks to the next ssp_clk rising edge +// 4*16 ticks until we measure the time +// - 8*16 ticks because we measure the time of the previous transfer +#define DELAY_AIR2ARM_AS_READER (3 + 10 + 6 + 7*16 + 8 + 4*16 - 8*16) + +// When the PM acts as a reader and is sending, it takes +// 4*16 ticks until we can write data to the sending hold register +// 8*16 ticks until the SHR is transferred to the Sending Shift Register +// 8 ticks until the first transfer starts +// 8 ticks later the FPGA samples the data +// 1 tick to assign mod_sig_coil +#define DELAY_ARM2AIR_AS_READER (4*16 + 8*16 + 8 + 8 + 1) + +// When the PM acts as tag and is receiving it takes +// 12 ticks delay in the RF part, +// 3 ticks for the A/D conversion, +// 8 ticks on average until the start of the SSC transfer, +// 8 ticks until the SSC samples the first data +// 7*16 ticks to complete the transfer from FPGA to ARM +// 8 ticks until the next ssp_clk rising edge +// 3*16 ticks until we measure the time +// - 8*16 ticks because we measure the time of the previous transfer +#define DELAY_AIR2ARM_AS_TAG (12 + 3 + 8 + 8 + 7*16 + 8 + 3*16 - 8*16) + +// The FPGA will report its internal sending delay in +uint16_t FpgaSendQueueDelay; +// the 5 first bits are the number of bits buffered in mod_sig_buf +// the last three bits are the remaining ticks/2 after the mod_sig_buf shift +#define DELAY_FPGA_QUEUE (FpgaSendQueueDelay<<1) + +// When the PM acts as tag and is sending, it takes +// 5*16 ticks until we can write data to the sending hold register +// 8*16 ticks until the SHR is transferred to the Sending Shift Register +// 8 ticks until the first transfer starts +// 8 ticks later the FPGA samples the data +// + a varying number of ticks in the FPGA Delay Queue (mod_sig_buf) +// + 1 tick to assign mod_sig_coil +#define DELAY_ARM2AIR_AS_TAG (5*16 + 8*16 + 8 + 8 + DELAY_FPGA_QUEUE + 1) + +// When the PM acts as sniffer and is receiving tag data, it takes +// 3 ticks A/D conversion +// 16 ticks delay in the modulation detector (on average). +// + 16 ticks until it's result is sampled. +// + the delays in transferring data - which is the same for +// sniffing reader and tag data and therefore not relevant +#define DELAY_TAG_AIR2ARM_AS_SNIFFER (3 + 16 + 16) + +// When the PM acts as sniffer and is receiving tag data, it takes +// 12 ticks delay in analogue RF receiver +// 3 ticks A/D conversion +// 8 ticks on average until we sample the data. +// + the delays in transferring data - which is the same for +// sniffing reader and tag data and therefore not relevant +#define DELAY_READER_AIR2ARM_AS_SNIFFER (12 + 3 + 8) + +//variables used for timing purposes: +//these are in ssp_clk cycles: +uint32_t NextTransferTime; +uint32_t LastTimeProxToAirStart; +uint32_t LastProxToAirDuration; + + + // CARD TO READER - manchester // Sequence D: 11110000 modulation with subcarrier during first half // Sequence E: 00001111 modulation with subcarrier during second half @@ -70,7 +150,7 @@ void iso14a_set_trigger(bool enable) { } void iso14a_clear_trace() { - memset(trace, 0x44, TRACE_SIZE); + memset(trace, 0x44, TRACE_SIZE); traceLen = 0; } @@ -110,274 +190,192 @@ void AppendCrc14443a(uint8_t* data, int len) } // The function LogTrace() is also used by the iClass implementation in iClass.c -int RAMFUNC LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader) +bool RAMFUNC LogTrace(const uint8_t * btBytes, uint8_t iLen, uint32_t timestamp, uint32_t dwParity, bool bReader) { - // Return when trace is full - if (traceLen >= TRACE_SIZE) return FALSE; - - // Trace the random, i'm curious - rsamples += iSamples; - trace[traceLen++] = ((rsamples >> 0) & 0xff); - trace[traceLen++] = ((rsamples >> 8) & 0xff); - trace[traceLen++] = ((rsamples >> 16) & 0xff); - trace[traceLen++] = ((rsamples >> 24) & 0xff); - if (!bReader) { - trace[traceLen - 1] |= 0x80; - } - trace[traceLen++] = ((dwParity >> 0) & 0xff); - trace[traceLen++] = ((dwParity >> 8) & 0xff); - trace[traceLen++] = ((dwParity >> 16) & 0xff); - trace[traceLen++] = ((dwParity >> 24) & 0xff); - trace[traceLen++] = iLen; - memcpy(trace + traceLen, btBytes, iLen); - traceLen += iLen; - return TRUE; + // Return when trace is full + if (traceLen + sizeof(timestamp) + sizeof(dwParity) + iLen >= TRACE_SIZE) { + tracing = FALSE; // don't trace any more + return FALSE; + } + + // Trace the random, i'm curious + trace[traceLen++] = ((timestamp >> 0) & 0xff); + trace[traceLen++] = ((timestamp >> 8) & 0xff); + trace[traceLen++] = ((timestamp >> 16) & 0xff); + trace[traceLen++] = ((timestamp >> 24) & 0xff); + if (!bReader) { + trace[traceLen - 1] |= 0x80; + } + trace[traceLen++] = ((dwParity >> 0) & 0xff); + trace[traceLen++] = ((dwParity >> 8) & 0xff); + trace[traceLen++] = ((dwParity >> 16) & 0xff); + trace[traceLen++] = ((dwParity >> 24) & 0xff); + trace[traceLen++] = iLen; + if (btBytes != NULL && iLen != 0) { + memcpy(trace + traceLen, btBytes, iLen); + } + traceLen += iLen; + return TRUE; } -//----------------------------------------------------------------------------- -// The software UART that receives commands from the reader, and its state -// variables. +//============================================================================= +// ISO 14443 Type A - Miller decoder +//============================================================================= +// Basics: +// This decoder is used when the PM3 acts as a tag. +// The reader will generate "pauses" by temporarily switching of the field. +// At the PM3 antenna we will therefore measure a modulated antenna voltage. +// The FPGA does a comparison with a threshold and would deliver e.g.: +// ........ 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 ....... +// The Miller decoder needs to identify the following sequences: +// 2 (or 3) ticks pause followed by 6 (or 5) ticks unmodulated: pause at beginning - Sequence Z ("start of communication" or a "0") +// 8 ticks without a modulation: no pause - Sequence Y (a "0" or "end of communication" or "no information") +// 4 ticks unmodulated followed by 2 (or 3) ticks pause: pause in second half - Sequence X (a "1") +// Note 1: the bitstream may start at any time. We therefore need to sync. +// Note 2: the interpretation of Sequence Y and Z depends on the preceding sequence. //----------------------------------------------------------------------------- static tUart Uart; -static RAMFUNC int MillerDecoding(int bit) +void UartReset() { - //int error = 0; - int bitright; + Uart.state = STATE_UNSYNCD; + Uart.bitCount = 0; + Uart.len = 0; // number of decoded data bytes + Uart.shiftReg = 0; // shiftreg to hold decoded data bits + Uart.parityBits = 0; // + Uart.twoBits = 0x0000; // buffer for 2 Bits + Uart.highCnt = 0; + Uart.startTime = 0; + Uart.endTime = 0; +} - if(!Uart.bitBuffer) { - Uart.bitBuffer = bit ^ 0xFF0; - return FALSE; - } - else { - Uart.bitBuffer <<= 4; - Uart.bitBuffer ^= bit; +inline RAMFUNC Modulation_t MillerModulation(uint8_t b) +{ + // switch (b & 0x88) { + // case 0x00: return MILLER_MOD_BOTH_HALVES; + // case 0x08: return MILLER_MOD_FIRST_HALF; + // case 0x80: return MILLER_MOD_SECOND_HALF; + // case 0x88: return MILLER_MOD_NOMOD; + // } + // test the second cycle for a pause. For whatever reason the startbit tends to appear earlier than the rest. + switch (b & 0x44) { + case 0x00: return MOD_BOTH_HALVES; + case 0x04: return MOD_FIRST_HALF; + case 0x40: return MOD_SECOND_HALF; + default: return MOD_NOMOD; } +} - int EOC = FALSE; - - if(Uart.state != STATE_UNSYNCD) { - Uart.posCnt++; - - if((Uart.bitBuffer & Uart.syncBit) ^ Uart.syncBit) { - bit = 0x00; - } - else { - bit = 0x01; - } - if(((Uart.bitBuffer << 1) & Uart.syncBit) ^ Uart.syncBit) { - bitright = 0x00; - } - else { - bitright = 0x01; - } - if(bit != bitright) { bit = bitright; } +// use parameter non_real_time to provide a timestamp. Set to 0 if the decoder should measure real time +static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) +{ - if(Uart.posCnt == 1) { - // measurement first half bitperiod - if(!bit) { - Uart.drop = DROP_FIRST_HALF; - } - } - else { - // measurement second half bitperiod - if(!bit & (Uart.drop == DROP_NONE)) { - Uart.drop = DROP_SECOND_HALF; + Uart.twoBits = (Uart.twoBits << 8) | bit; + + if (Uart.state == STATE_UNSYNCD) { // not yet synced + if (Uart.highCnt < 7) { // wait for a stable unmodulated signal + if (Uart.twoBits == 0xffff) { + Uart.highCnt++; + } else { + Uart.highCnt = 0; } - else if(!bit) { - // measured a drop in first and second half - // which should not be possible - Uart.state = STATE_ERROR_WAIT; - //error = 0x01; + } else { + Uart.syncBit = 0xFFFF; // not set + // look for 00xx1111 (the start bit) + if ((Uart.twoBits & 0x6780) == 0x0780) Uart.syncBit = 7; + else if ((Uart.twoBits & 0x33C0) == 0x03C0) Uart.syncBit = 6; + else if ((Uart.twoBits & 0x19E0) == 0x01E0) Uart.syncBit = 5; + else if ((Uart.twoBits & 0x0CF0) == 0x00F0) Uart.syncBit = 4; + else if ((Uart.twoBits & 0x0678) == 0x0078) Uart.syncBit = 3; + else if ((Uart.twoBits & 0x033C) == 0x003C) Uart.syncBit = 2; + else if ((Uart.twoBits & 0x019E) == 0x001E) Uart.syncBit = 1; + else if ((Uart.twoBits & 0x00CF) == 0x000F) Uart.syncBit = 0; + if (Uart.syncBit != 0xFFFF) { + Uart.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8); + Uart.startTime -= Uart.syncBit; + Uart.state = STATE_START_OF_COMMUNICATION; } + } - Uart.posCnt = 0; - - switch(Uart.state) { - case STATE_START_OF_COMMUNICATION: - Uart.shiftReg = 0; - if(Uart.drop == DROP_SECOND_HALF) { - // error, should not happen in SOC - Uart.state = STATE_ERROR_WAIT; - //error = 0x02; - } - else { - // correct SOC - Uart.state = STATE_MILLER_Z; - } - break; - - case STATE_MILLER_Z: - Uart.bitCnt++; - Uart.shiftReg >>= 1; - if(Uart.drop == DROP_NONE) { - // logic '0' followed by sequence Y - // end of communication - Uart.state = STATE_UNSYNCD; - EOC = TRUE; - } - // if(Uart.drop == DROP_FIRST_HALF) { - // Uart.state = STATE_MILLER_Z; stay the same - // we see a logic '0' } - if(Uart.drop == DROP_SECOND_HALF) { - // we see a logic '1' - Uart.shiftReg |= 0x100; - Uart.state = STATE_MILLER_X; - } - break; - - case STATE_MILLER_X: - Uart.shiftReg >>= 1; - if(Uart.drop == DROP_NONE) { - // sequence Y, we see a '0' - Uart.state = STATE_MILLER_Y; - Uart.bitCnt++; - } - if(Uart.drop == DROP_FIRST_HALF) { - // Would be STATE_MILLER_Z - // but Z does not follow X, so error - Uart.state = STATE_ERROR_WAIT; - //error = 0x03; - } - if(Uart.drop == DROP_SECOND_HALF) { - // We see a '1' and stay in state X - Uart.shiftReg |= 0x100; - Uart.bitCnt++; - } - break; - - case STATE_MILLER_Y: - Uart.bitCnt++; - Uart.shiftReg >>= 1; - if(Uart.drop == DROP_NONE) { - // logic '0' followed by sequence Y - // end of communication - Uart.state = STATE_UNSYNCD; - EOC = TRUE; - } - if(Uart.drop == DROP_FIRST_HALF) { - // we see a '0' - Uart.state = STATE_MILLER_Z; - } - if(Uart.drop == DROP_SECOND_HALF) { - // We see a '1' and go to state X - Uart.shiftReg |= 0x100; - Uart.state = STATE_MILLER_X; - } - break; + } else { - case STATE_ERROR_WAIT: - // That went wrong. Now wait for at least two bit periods - // and try to sync again - if(Uart.drop == DROP_NONE) { - Uart.highCnt = 6; - Uart.state = STATE_UNSYNCD; + switch (MillerModulation(Uart.twoBits >> Uart.syncBit)) { + case MOD_FIRST_HALF: // Sequence Z = 0 + if (Uart.state == STATE_MILLER_X) { // error - must not follow after X + UartReset(); + Uart.highCnt = 6; + } else { + Uart.bitCount++; + Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg + Uart.state = STATE_MILLER_Z; + Uart.endTime = Uart.startTime + 8*(9*Uart.len + Uart.bitCount + 1) - 6; + if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) + Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); + Uart.parityBits <<= 1; // make room for the parity bit + Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit + Uart.bitCount = 0; + Uart.shiftReg = 0; } - break; - - default: + } + break; + case MOD_SECOND_HALF: // Sequence X = 1 + Uart.bitCount++; + Uart.shiftReg = (Uart.shiftReg >> 1) | 0x100; // add a 1 to the shiftreg + Uart.state = STATE_MILLER_X; + Uart.endTime = Uart.startTime + 8*(9*Uart.len + Uart.bitCount + 1) - 2; + if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) + Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); + Uart.parityBits <<= 1; // make room for the new parity bit + Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit + Uart.bitCount = 0; + Uart.shiftReg = 0; + } + break; + case MOD_NOMOD: // no modulation in both halves - Sequence Y + if (Uart.state == STATE_MILLER_Z || Uart.state == STATE_MILLER_Y) { // Y after logic "0" - End of Communication Uart.state = STATE_UNSYNCD; - Uart.highCnt = 0; - break; - } - - Uart.drop = DROP_NONE; - - // should have received at least one whole byte... - if((Uart.bitCnt == 2) && EOC && (Uart.byteCnt > 0)) { - return TRUE; - } - - if(Uart.bitCnt == 9) { - Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff); - Uart.byteCnt++; - - Uart.parityBits <<= 1; - Uart.parityBits ^= ((Uart.shiftReg >> 8) & 0x01); - - if(EOC) { - // when End of Communication received and - // all data bits processed.. + if(Uart.len == 0 && Uart.bitCount > 0) { // if we decoded some bits + Uart.shiftReg >>= (9 - Uart.bitCount); // add them to the output + Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); + Uart.parityBits <<= 1; // no parity bit - add "0" + Uart.bitCount--; // last "0" was part of the EOC sequence + } return TRUE; } - Uart.bitCnt = 0; - } - - /*if(error) { - Uart.output[Uart.byteCnt] = 0xAA; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = error & 0xFF; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = 0xAA; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = (Uart.bitBuffer >> 8) & 0xFF; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = (Uart.syncBit >> 3) & 0xFF; - Uart.byteCnt++; - Uart.output[Uart.byteCnt] = 0xAA; - Uart.byteCnt++; - return TRUE; - }*/ - } - - } - else { - bit = Uart.bitBuffer & 0xf0; - bit >>= 4; - bit ^= 0x0F; - if(bit) { - // should have been high or at least (4 * 128) / fc - // according to ISO this should be at least (9 * 128 + 20) / fc - if(Uart.highCnt == 8) { - // we went low, so this could be start of communication - // it turns out to be safer to choose a less significant - // syncbit... so we check whether the neighbour also represents the drop - Uart.posCnt = 1; // apparently we are busy with our first half bit period - Uart.syncBit = bit & 8; - Uart.samples = 3; - if(!Uart.syncBit) { Uart.syncBit = bit & 4; Uart.samples = 2; } - else if(bit & 4) { Uart.syncBit = bit & 4; Uart.samples = 2; bit <<= 2; } - if(!Uart.syncBit) { Uart.syncBit = bit & 2; Uart.samples = 1; } - else if(bit & 2) { Uart.syncBit = bit & 2; Uart.samples = 1; bit <<= 1; } - if(!Uart.syncBit) { Uart.syncBit = bit & 1; Uart.samples = 0; - if(Uart.syncBit && (Uart.bitBuffer & 8)) { - Uart.syncBit = 8; - - // the first half bit period is expected in next sample - Uart.posCnt = 0; - Uart.samples = 3; + if (Uart.state == STATE_START_OF_COMMUNICATION) { // error - must not follow directly after SOC + UartReset(); + Uart.highCnt = 6; + } else { // a logic "0" + Uart.bitCount++; + Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg + Uart.state = STATE_MILLER_Y; + if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity) + Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); + Uart.parityBits <<= 1; // make room for the parity bit + Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit + Uart.bitCount = 0; + Uart.shiftReg = 0; } } - else if(bit & 1) { Uart.syncBit = bit & 1; Uart.samples = 0; } - - Uart.syncBit <<= 4; - Uart.state = STATE_START_OF_COMMUNICATION; - Uart.drop = DROP_FIRST_HALF; - Uart.bitCnt = 0; - Uart.byteCnt = 0; - Uart.parityBits = 0; - //error = 0; - } - else { - Uart.highCnt = 0; - } - } - else { - if(Uart.highCnt < 8) { - Uart.highCnt++; - } + break; + case MOD_BOTH_HALVES: // Error + UartReset(); + Uart.highCnt = 6; + return FALSE; } - } + + } - return FALSE; + return FALSE; // not finished yet, need more data } + + //============================================================================= // ISO 14443 Type A - Manchester decoder //============================================================================= // Basics: +// This decoder is used when the PM3 acts as a reader. // The tag will modulate the reader field by asserting different loads to it. As a consequence, the voltage // at the reader antenna will be modulated as well. The FPGA detects the modulation for us and would deliver e.g. the following: // ........ 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ....... @@ -386,105 +384,95 @@ static RAMFUNC int MillerDecoding(int bit) // 4 ticks unmodulated followed by 4 ticks modulated: Sequence E = 0 // 8 ticks unmodulated: Sequence F = end of communication // 8 ticks modulated: A collision. Save the collision position and treat as Sequence D -// Note 1: the bitstream may start at any time (either in first or second nibble within the parameter bit). We therefore need to sync. +// Note 1: the bitstream may start at any time. We therefore need to sync. // Note 2: parameter offset is used to determine the position of the parity bits (required for the anticollision command only) static tDemod Demod; -inline RAMFUNC bool IsModulation(byte_t b) -{ - if (b >= 5 || b == 3) // majority decision: 2 or more bits are set - return true; - else - return false; - -} +const bool Mod_Manchester_LUT[] = { + FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, + FALSE, FALSE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE +}; + +#define IsManchesterModulationNibble1(b) (Mod_Manchester_LUT[(b & 0x00F0) >> 4]) +#define IsManchesterModulationNibble2(b) (Mod_Manchester_LUT[(b & 0x000F)]) -inline RAMFUNC bool IsModulationNibble1(byte_t b) -{ - return IsModulation((b & 0xE0) >> 5); -} -inline RAMFUNC bool IsModulationNibble2(byte_t b) +void DemodReset() { - return IsModulation((b & 0x0E) >> 1); + Demod.state = DEMOD_UNSYNCD; + Demod.len = 0; // number of decoded data bytes + Demod.shiftReg = 0; // shiftreg to hold decoded data bits + Demod.parityBits = 0; // + Demod.collisionPos = 0; // Position of collision bit + Demod.twoBits = 0xffff; // buffer for 2 Bits + Demod.highCnt = 0; + Demod.startTime = 0; + Demod.endTime = 0; } -static RAMFUNC int ManchesterDecoding(int bit, uint16_t offset) +// use parameter non_real_time to provide a timestamp. Set to 0 if the decoder should measure real time +static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non_real_time) { + + Demod.twoBits = (Demod.twoBits << 8) | bit; - switch (Demod.state) { - - case DEMOD_UNSYNCD: // not yet synced - Demod.len = 0; // initialize number of decoded data bytes - Demod.bitCount = offset; // initialize number of decoded data bits - Demod.shiftReg = 0; // initialize shiftreg to hold decoded data bits - Demod.parityBits = 0; // initialize parity bits - Demod.collisionPos = 0; // Position of collision bit - - if (IsModulationNibble1(bit) - && !IsModulationNibble2(bit)) { // this is the start bit - Demod.samples = 8; - if(trigger) LED_A_OFF(); + if (Demod.state == DEMOD_UNSYNCD) { + + if (Demod.highCnt < 2) { // wait for a stable unmodulated signal + if (Demod.twoBits == 0x0000) { + Demod.highCnt++; + } else { + Demod.highCnt = 0; + } + } else { + Demod.syncBit = 0xFFFF; // not set + if ((Demod.twoBits & 0x7700) == 0x7000) Demod.syncBit = 7; + else if ((Demod.twoBits & 0x3B80) == 0x3800) Demod.syncBit = 6; + else if ((Demod.twoBits & 0x1DC0) == 0x1C00) Demod.syncBit = 5; + else if ((Demod.twoBits & 0x0EE0) == 0x0E00) Demod.syncBit = 4; + else if ((Demod.twoBits & 0x0770) == 0x0700) Demod.syncBit = 3; + else if ((Demod.twoBits & 0x03B8) == 0x0380) Demod.syncBit = 2; + else if ((Demod.twoBits & 0x01DC) == 0x01C0) Demod.syncBit = 1; + else if ((Demod.twoBits & 0x00EE) == 0x00E0) Demod.syncBit = 0; + if (Demod.syncBit < 8) { + Demod.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8); + Demod.startTime -= Demod.syncBit; + Demod.bitCount = offset; // number of decoded data bits Demod.state = DEMOD_MANCHESTER_DATA; - } else if (!IsModulationNibble1(bit) && IsModulationNibble2(bit)) { // this may be the first half of the start bit - Demod.samples = 4; - Demod.state = DEMOD_HALF_SYNCD; } - break; + } + } else { - case DEMOD_HALF_SYNCD: - Demod.samples += 8; - if (IsModulationNibble1(bit)) { // error: this was not a start bit. - Demod.state = DEMOD_UNSYNCD; - } else { - if (IsModulationNibble2(bit)) { // modulation in first half - Demod.state = DEMOD_MOD_FIRST_HALF; - } else { // no modulation in first half - Demod.state = DEMOD_NOMOD_FIRST_HALF; - } - } - break; - - - case DEMOD_MOD_FIRST_HALF: - Demod.samples += 8; - Demod.bitCount++; - if (IsModulationNibble1(bit)) { // modulation in both halfs - collision + if (IsManchesterModulationNibble1(Demod.twoBits >> Demod.syncBit)) { // modulation in first half + if (IsManchesterModulationNibble2(Demod.twoBits >> Demod.syncBit)) { // ... and in second half = collision if (!Demod.collisionPos) { Demod.collisionPos = (Demod.len << 3) + Demod.bitCount; } } // modulation in first half only - Sequence D = 1 - Demod.shiftReg = (Demod.shiftReg >> 1) | 0x100; // add a 1 to the shiftreg - if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity) - Demod.parityBits <<= 1; // make room for the parity bit + Demod.bitCount++; + Demod.shiftReg = (Demod.shiftReg >> 1) | 0x100; // in both cases, add a 1 to the shiftreg + if(Demod.bitCount == 9) { // if we decoded a full byte (including parity) Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); + Demod.parityBits <<= 1; // make room for the parity bit Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit Demod.bitCount = 0; Demod.shiftReg = 0; } - if (IsModulationNibble2(bit)) { // modulation in first half - Demod.state = DEMOD_MOD_FIRST_HALF; - } else { // no modulation in first half - Demod.state = DEMOD_NOMOD_FIRST_HALF; - } - break; - - - case DEMOD_NOMOD_FIRST_HALF: - if (IsModulationNibble1(bit)) { // modulation in second half only - Sequence E = 0 + Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1) - 4; + } else { // no modulation in first half + if (IsManchesterModulationNibble2(Demod.twoBits >> Demod.syncBit)) { // and modulation in second half = Sequence E = 0 Demod.bitCount++; - Demod.samples += 8; - Demod.shiftReg = (Demod.shiftReg >> 1); // add a 0 to the shiftreg + Demod.shiftReg = (Demod.shiftReg >> 1); // add a 0 to the shiftreg if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity) - Demod.parityBits <<= 1; // make room for the new parity bit Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); + Demod.parityBits <<= 1; // make room for the new parity bit Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit Demod.bitCount = 0; Demod.shiftReg = 0; } + Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1); } else { // no modulation in both halves - End of communication - Demod.samples += 4; if(Demod.bitCount > 0) { // if we decoded bits Demod.shiftReg >>= (9 - Demod.bitCount); // add the remaining decoded bits to the output Demod.output[Demod.len++] = Demod.shiftReg & 0xff; @@ -492,55 +480,10 @@ static RAMFUNC int ManchesterDecoding(int bit, uint16_t offset) Demod.parityBits <<= 1; } Demod.state = DEMOD_UNSYNCD; // start from the beginning + Demod.twoBits = 0; return TRUE; // we are finished with decoding the raw data sequence } - if (IsModulationNibble2(bit)) { // modulation in first half - Demod.state = DEMOD_MOD_FIRST_HALF; - } else { // no modulation in first half - Demod.state = DEMOD_NOMOD_FIRST_HALF; - } - break; - - - case DEMOD_MANCHESTER_DATA: - Demod.samples += 8; - if (IsModulationNibble1(bit)) { // modulation in first half - if (IsModulationNibble2(bit) & 0x0f) { // ... and in second half = collision - if (!Demod.collisionPos) { - Demod.collisionPos = (Demod.len << 3) + Demod.bitCount; - } - } // modulation in first half only - Sequence D = 1 - Demod.bitCount++; - Demod.shiftReg = (Demod.shiftReg >> 1) | 0x100; // in both cases, add a 1 to the shiftreg - if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity) - Demod.parityBits <<= 1; // make room for the parity bit - Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); - Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit - Demod.bitCount = 0; - Demod.shiftReg = 0; - } - } else { // no modulation in first half - if (IsModulationNibble2(bit)) { // and modulation in second half = Sequence E = 0 - Demod.bitCount++; - Demod.shiftReg = (Demod.shiftReg >> 1); // add a 0 to the shiftreg - if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity) - Demod.parityBits <<= 1; // make room for the new parity bit - Demod.output[Demod.len++] = (Demod.shiftReg & 0xff); - Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit - Demod.bitCount = 0; - Demod.shiftReg = 0; - } - } else { // no modulation in both halves - End of communication - if(Demod.bitCount > 0) { // if we decoded bits - Demod.shiftReg >>= (9 - Demod.bitCount); // add the remaining decoded bits to the output - Demod.output[Demod.len++] = Demod.shiftReg & 0xff; - // No parity bit, so just shift a 0 - Demod.parityBits <<= 1; - } - Demod.state = DEMOD_UNSYNCD; // start from the beginning - return TRUE; // we are finished with decoding the raw data sequence - } - } + } } @@ -570,8 +513,8 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { // a good trigger condition to get started is probably when we see a // response from the tag. // triggered == FALSE -- to wait first for card - int triggered = !(param & 0x03); - + bool triggered = !(param & 0x03); + // The command (reader -> tag) that we're receiving. // The length of a received command will in most cases be no more than 18 bytes. // So 32 should be enough! @@ -584,40 +527,31 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { //uint8_t *trace = (uint8_t *)BigBuf; // The DMA buffer, used to stream samples from the FPGA - int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET; - int8_t *data = dmaBuf; + uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET; + uint8_t *data = dmaBuf; + uint8_t previous_data = 0; int maxDataLen = 0; int dataLen = 0; + bool TagIsActive = FALSE; + bool ReaderIsActive = FALSE; + + iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); // Set up the demodulator for tag -> reader responses. Demod.output = receivedResponse; - Demod.len = 0; - Demod.state = DEMOD_UNSYNCD; // Set up the demodulator for the reader -> tag commands - memset(&Uart, 0, sizeof(Uart)); Uart.output = receivedCmd; - Uart.byteCntMax = 32; // was 100 (greg)////////////////// - Uart.state = STATE_UNSYNCD; - // Setup for the DMA. - FpgaSetupSsc(); + // Setup and start DMA. FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); - - // And put the FPGA in the appropriate mode - // Signal field is off with the appropriate LED - LED_D_OFF(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER); - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - - // Count of samples received so far, so that we can include timing - // information in the trace buffer. - rsamples = 0; + // And now we loop, receiving samples. - while(true) { + for(uint32_t rsamples = 0; TRUE; ) { + if(BUTTON_PRESS()) { DbpString("cancelled by button"); - goto done; + break; } LED_A_ON(); @@ -628,14 +562,14 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { if (readBufDataP <= dmaBufDataP){ dataLen = dmaBufDataP - readBufDataP; } else { - dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1; + dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP; } // test for length of buffer if(dataLen > maxDataLen) { maxDataLen = dataLen; if(dataLen > 400) { - Dbprintf("blew circular buffer! dataLen=0x%x", dataLen); - goto done; + Dbprintf("blew circular buffer! dataLen=%d", dataLen); + break; } } if(dataLen < 1) continue; @@ -644,6 +578,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { if (!AT91C_BASE_PDC_SSC->PDC_RCR) { AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf; AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE; + Dbprintf("RxEmpty ERROR!!! data length:%d", dataLen); // temporary } // secondary buffer sets as primary, secondary buffer was stopped if (!AT91C_BASE_PDC_SSC->PDC_RNCR) { @@ -652,39 +587,51 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { } LED_A_OFF(); + + if (rsamples & 0x01) { // Need two samples to feed Miller and Manchester-Decoder - rsamples += 4; - if(MillerDecoding((data[0] & 0xF0) >> 4)) { - LED_C_ON(); + if(!TagIsActive) { // no need to try decoding reader data if the tag is sending + uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4); + if (MillerDecoding(readerdata, (rsamples-1)*4)) { + LED_C_ON(); - // check - if there is a short 7bit request from reader - if ((!triggered) && (param & 0x02) && (Uart.byteCnt == 1) && (Uart.bitCnt = 9)) triggered = TRUE; + // check - if there is a short 7bit request from reader + if ((!triggered) && (param & 0x02) && (Uart.len == 1) && (Uart.bitCount == 7)) triggered = TRUE; - if(triggered) { - if (!LogTrace(receivedCmd, Uart.byteCnt, 0 - Uart.samples, Uart.parityBits, TRUE)) break; + if(triggered) { + if (!LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, Uart.parityBits, TRUE)) break; + if (!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break; + } + /* 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(); + LED_B_OFF(); + } + ReaderIsActive = (Uart.state != STATE_UNSYNCD); } - /* And ready to receive another command. */ - Uart.state = STATE_UNSYNCD; - /* And also reset the demod code, which might have been */ - /* false-triggered by the commands from the reader. */ - Demod.state = DEMOD_UNSYNCD; - LED_B_OFF(); - } - if(ManchesterDecoding(data[0], 0)) { - LED_B_ON(); + if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time + uint8_t tagdata = (previous_data << 4) | (*data & 0x0F); + if(ManchesterDecoding(tagdata, 0, (rsamples-1)*4)) { + LED_B_ON(); - if (!LogTrace(receivedResponse, Demod.len, 0 - Demod.samples, Demod.parityBits, FALSE)) break; + if (!LogTrace(receivedResponse, Demod.len, Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, Demod.parityBits, FALSE)) break; + if (!LogTrace(NULL, 0, Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, 0, FALSE)) break; - if ((!triggered) && (param & 0x01)) triggered = TRUE; + if ((!triggered) && (param & 0x01)) triggered = TRUE; - // And ready to receive another response. - memset(&Demod, 0, sizeof(Demod)); - Demod.output = receivedResponse; - Demod.state = DEMOD_UNSYNCD; - LED_C_OFF(); + // And ready to receive another response. + DemodReset(); + LED_C_OFF(); + } + TagIsActive = (Demod.state != DEMOD_UNSYNCD); + } } + previous_data = *data; + rsamples++; data++; if(data > dmaBuf + DMA_BUFFER_SIZE) { data = dmaBuf; @@ -693,10 +640,9 @@ void RAMFUNC SnoopIso14443a(uint8_t param) { DbpString("COMMAND FINISHED"); -done: - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; - Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x", maxDataLen, Uart.state, Uart.byteCnt); - Dbprintf("Uart.byteCntMax=%x, traceLen=%x, Uart.output[0]=%08x", Uart.byteCntMax, traceLen, (int)Uart.output[0]); + FpgaDisableSscDma(); + Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len); + Dbprintf("traceLen=%d, Uart.output[0]=%08x", traceLen, (uint32_t)Uart.output[0]); LEDsoff(); } @@ -721,6 +667,7 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity // Send startbit ToSend[++ToSendMax] = SEC_D; + LastProxToAirDuration = 8 * ToSendMax - 4; for(i = 0; i < len; i++) { int j; @@ -739,8 +686,10 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity // Get the parity bit if ((dwParity >> i) & 0x01) { ToSend[++ToSendMax] = SEC_D; + LastProxToAirDuration = 8 * ToSendMax - 4; } else { ToSend[++ToSendMax] = SEC_E; + LastProxToAirDuration = 8 * ToSendMax; } } @@ -755,48 +704,6 @@ static void CodeIso14443aAsTag(const uint8_t *cmd, int len){ CodeIso14443aAsTagPar(cmd, len, GetParity(cmd, len)); } -////----------------------------------------------------------------------------- -//// This is to send a NACK kind of answer, its only 3 bits, I know it should be 4 -////----------------------------------------------------------------------------- -//static void CodeStrangeAnswerAsTag() -//{ -// int i; -// -// ToSendReset(); -// -// // Correction bit, might be removed when not needed -// ToSendStuffBit(0); -// ToSendStuffBit(0); -// ToSendStuffBit(0); -// ToSendStuffBit(0); -// ToSendStuffBit(1); // 1 -// ToSendStuffBit(0); -// ToSendStuffBit(0); -// ToSendStuffBit(0); -// -// // Send startbit -// ToSend[++ToSendMax] = SEC_D; -// -// // 0 -// ToSend[++ToSendMax] = SEC_E; -// -// // 0 -// ToSend[++ToSendMax] = SEC_E; -// -// // 1 -// ToSend[++ToSendMax] = SEC_D; -// -// // Send stopbit -// ToSend[++ToSendMax] = SEC_F; -// -// // Flush the buffer in FPGA!! -// for(i = 0; i < 5; i++) { -// ToSend[++ToSendMax] = SEC_F; -// } -// -// // Convert from last byte pos to length -// ToSendMax++; -//} static void Code4bitAnswerAsTag(uint8_t cmd) { @@ -821,8 +728,10 @@ static void Code4bitAnswerAsTag(uint8_t cmd) for(i = 0; i < 4; i++) { if(b & 1) { ToSend[++ToSendMax] = SEC_D; + LastProxToAirDuration = 8 * ToSendMax - 4; } else { ToSend[++ToSendMax] = SEC_E; + LastProxToAirDuration = 8 * ToSendMax; } b >>= 1; } @@ -830,11 +739,6 @@ static void Code4bitAnswerAsTag(uint8_t cmd) // Send stopbit ToSend[++ToSendMax] = SEC_F; - // Flush the buffer in FPGA!! - for(i = 0; i < 5; i++) { - ToSend[++ToSendMax] = SEC_F; - } - // Convert from last byte pos to length ToSendMax++; } @@ -853,40 +757,37 @@ static int GetIso14443aCommandFromReader(uint8_t *received, int *len, int maxLen FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); // Now run a `software UART' on the stream of incoming samples. + UartReset(); Uart.output = received; - Uart.byteCntMax = maxLen; - Uart.state = STATE_UNSYNCD; + + // clear RXRDY: + uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; for(;;) { WDT_HIT(); if(BUTTON_PRESS()) return FALSE; - - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x00; - } + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - if(MillerDecoding((b & 0xf0) >> 4)) { - *len = Uart.byteCnt; - return TRUE; - } - if(MillerDecoding(b & 0x0f)) { - *len = Uart.byteCnt; + b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + if(MillerDecoding(b, 0)) { + *len = Uart.len; return TRUE; } - } + } } } -static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded); -int EmSend4bitEx(uint8_t resp, int correctionNeeded); +static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, bool correctionNeeded); +int EmSend4bitEx(uint8_t resp, bool correctionNeeded); int EmSend4bit(uint8_t resp); -int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par); -int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par); -int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded); +int EmSendCmdExPar(uint8_t *resp, int respLen, bool correctionNeeded, uint32_t par); +int EmSendCmdExPar(uint8_t *resp, int respLen, bool correctionNeeded, uint32_t par); +int EmSendCmdEx(uint8_t *resp, int respLen, bool correctionNeeded); int EmSendCmd(uint8_t *resp, int respLen); int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par); +bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint32_t reader_Parity, + uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint32_t tag_Parity); static uint8_t* free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); @@ -895,6 +796,7 @@ typedef struct { size_t response_n; uint8_t* modulation; size_t modulation_n; + uint32_t ProxToAirDuration; } tag_response_info_t; void reset_free_buffer() { @@ -902,7 +804,7 @@ void reset_free_buffer() { } bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffer_size) { - // Exmaple response, answer to MIFARE Classic read block will be 16 bytes + 2 CRC = 18 bytes + // Example response, answer to MIFARE Classic read block will be 16 bytes + 2 CRC = 18 bytes // This will need the following byte array for a modulation sequence // 144 data bits (18 * 8) // 18 parity bits @@ -926,8 +828,9 @@ bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffe // Copy the byte array, used for this modulation to the buffer position memcpy(response_info->modulation,ToSend,ToSendMax); - // Store the number of bytes that were used for encoding/modulation + // Store the number of bytes that were used for encoding/modulation and the time needed to transfer them response_info->modulation_n = ToSendMax; + response_info->ProxToAirDuration = LastProxToAirDuration; return true; } @@ -956,10 +859,9 @@ bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) { void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) { // Enable and clear the trace - tracing = TRUE; iso14a_clear_trace(); + iso14a_set_tracing(TRUE); - // This function contains the tag emulation uint8_t sak; // The first response contains the ATQA (note: bytes are transmitted in reverse order). @@ -1034,41 +936,41 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) uint8_t response6[] = { 0x04, 0x58, 0x00, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS ComputeCrc14443(CRC_14443_A, response6, 4, &response6[4], &response6[5]); - #define TAG_RESPONSE_COUNT 7 - tag_response_info_t responses[TAG_RESPONSE_COUNT] = { - { .response = response1, .response_n = sizeof(response1) }, // Answer to request - respond with card type - { .response = response2, .response_n = sizeof(response2) }, // Anticollision cascade1 - respond with uid - { .response = response2a, .response_n = sizeof(response2a) }, // Anticollision cascade2 - respond with 2nd half of uid if asked - { .response = response3, .response_n = sizeof(response3) }, // Acknowledge select - cascade 1 - { .response = response3a, .response_n = sizeof(response3a) }, // Acknowledge select - cascade 2 - { .response = response5, .response_n = sizeof(response5) }, // Authentication answer (random nonce) - { .response = response6, .response_n = sizeof(response6) }, // dummy ATS (pseudo-ATR), answer to RATS - }; - - // Allocate 512 bytes for the dynamic modulation, created when the reader querries for it - // Such a response is less time critical, so we can prepare them on the fly - #define DYNAMIC_RESPONSE_BUFFER_SIZE 64 - #define DYNAMIC_MODULATION_BUFFER_SIZE 512 - uint8_t dynamic_response_buffer[DYNAMIC_RESPONSE_BUFFER_SIZE]; - uint8_t dynamic_modulation_buffer[DYNAMIC_MODULATION_BUFFER_SIZE]; - tag_response_info_t dynamic_response_info = { - .response = dynamic_response_buffer, - .response_n = 0, - .modulation = dynamic_modulation_buffer, - .modulation_n = 0 - }; + #define TAG_RESPONSE_COUNT 7 + tag_response_info_t responses[TAG_RESPONSE_COUNT] = { + { .response = response1, .response_n = sizeof(response1) }, // Answer to request - respond with card type + { .response = response2, .response_n = sizeof(response2) }, // Anticollision cascade1 - respond with uid + { .response = response2a, .response_n = sizeof(response2a) }, // Anticollision cascade2 - respond with 2nd half of uid if asked + { .response = response3, .response_n = sizeof(response3) }, // Acknowledge select - cascade 1 + { .response = response3a, .response_n = sizeof(response3a) }, // Acknowledge select - cascade 2 + { .response = response5, .response_n = sizeof(response5) }, // Authentication answer (random nonce) + { .response = response6, .response_n = sizeof(response6) }, // dummy ATS (pseudo-ATR), answer to RATS + }; + + // Allocate 512 bytes for the dynamic modulation, created when the reader queries for it + // Such a response is less time critical, so we can prepare them on the fly + #define DYNAMIC_RESPONSE_BUFFER_SIZE 64 + #define DYNAMIC_MODULATION_BUFFER_SIZE 512 + uint8_t dynamic_response_buffer[DYNAMIC_RESPONSE_BUFFER_SIZE]; + uint8_t dynamic_modulation_buffer[DYNAMIC_MODULATION_BUFFER_SIZE]; + tag_response_info_t dynamic_response_info = { + .response = dynamic_response_buffer, + .response_n = 0, + .modulation = dynamic_modulation_buffer, + .modulation_n = 0 + }; - // Reset the offset pointer of the free buffer - reset_free_buffer(); + // Reset the offset pointer of the free buffer + reset_free_buffer(); - // Prepare the responses of the anticollision phase + // Prepare the responses of the anticollision phase // there will be not enough time to do this at the moment the reader sends it REQA - for (size_t i=0; i 0) { - // Copy the CID from the reader query - dynamic_response_info.response[1] = receivedCmd[1]; + if (dynamic_response_info.response_n > 0) { + // Copy the CID from the reader query + dynamic_response_info.response[1] = receivedCmd[1]; - // Add CRC bytes, always used in ISO 14443A-4 compliant cards - AppendCrc14443a(dynamic_response_info.response,dynamic_response_info.response_n); - dynamic_response_info.response_n += 2; + // Add CRC bytes, always used in ISO 14443A-4 compliant cards + AppendCrc14443a(dynamic_response_info.response,dynamic_response_info.response_n); + dynamic_response_info.response_n += 2; - if (prepare_tag_modulation(&dynamic_response_info,DYNAMIC_MODULATION_BUFFER_SIZE) == false) { - Dbprintf("Error preparing tag response"); - break; - } - p_response = &dynamic_response_info; - } + if (prepare_tag_modulation(&dynamic_response_info,DYNAMIC_MODULATION_BUFFER_SIZE) == false) { + Dbprintf("Error preparing tag response"); + if (tracing) { + LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); + } + break; + } + p_response = &dynamic_response_info; + } } // Count number of wakeups received after a halt @@ -1200,12 +1117,6 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) // Count number of other messages after a halt if(order != 6 && lastorder == 5) { happened2++; } - // Look at last parity bit to determine timing of answer - if((Uart.parityBits & 0x01) || receivedCmd[0] == 0x52) { - // 1236, so correction bit needed - //i = 0; - } - if(cmdsRecvd > 999) { DbpString("1000 commands later..."); break; @@ -1213,16 +1124,25 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) cmdsRecvd++; if (p_response != NULL) { - EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n, receivedCmd[0] == 0x52); - if (tracing) { - LogTrace(p_response->response,p_response->response_n,0,SwapBits(GetParity(p_response->response,p_response->response_n),p_response->response_n),FALSE); - if(traceLen > TRACE_SIZE) { - DbpString("Trace full"); -// break; - } - } - } - } + EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n, receivedCmd[0] == 0x52); + // do the tracing for the previous reader request and this tag answer: + EmLogTrace(Uart.output, + Uart.len, + Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.parityBits, + p_response->response, + p_response->response_n, + LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, + (LastTimeProxToAirStart + p_response->ProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, + SwapBits(GetParity(p_response->response, p_response->response_n), p_response->response_n)); + } + + if (!tracing) { + Dbprintf("Trace Full. Simulation stopped."); + break; + } + } Dbprintf("%x %x %x", happened, happened2, cmdsRecvd); LED_A_OFF(); @@ -1242,7 +1162,7 @@ void PrepareDelayedTransfer(uint16_t delay) for (uint16_t i = 0; i < delay; i++) { bitmask |= (0x01 << i); } - ToSend[++ToSendMax] = 0x00; + ToSend[ToSendMax++] = 0x00; for (uint16_t i = 0; i < ToSendMax; i++) { bits_to_shift = ToSend[i] & bitmask; ToSend[i] = ToSend[i] >> delay; @@ -1252,38 +1172,48 @@ void PrepareDelayedTransfer(uint16_t delay) } } -//----------------------------------------------------------------------------- + +//------------------------------------------------------------------------------------- // Transmit the command (to the tag) that was placed in ToSend[]. // Parameter timing: -// if NULL: ignored -// if == 0: return time of transfer +// if NULL: transfer at next possible time, taking into account +// request guard time and frame delay time +// if == 0: transfer immediately and return time of transfer // if != 0: delay transfer until time specified -//----------------------------------------------------------------------------- +//------------------------------------------------------------------------------------- static void TransmitFor14443a(const uint8_t *cmd, int len, uint32_t *timing) { - int c; - + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); + uint32_t ThisTransferTime = 0; if (timing) { if(*timing == 0) { // Measure time - *timing = (GetCountMifare() + 8) & 0xfffffff8; + *timing = (GetCountSspClk() + 8) & 0xfffffff8; } else { PrepareDelayedTransfer(*timing & 0x00000007); // Delay transfer (fine tuning - up to 7 MF clock ticks) } - if(MF_DBGLEVEL >= 4 && GetCountMifare() >= (*timing & 0xfffffff8)) Dbprintf("TransmitFor14443a: Missed timing"); - while(GetCountMifare() < (*timing & 0xfffffff8)); // Delay transfer (multiple of 8 MF clock ticks) - } - - for(c = 0; c < 10;) { // standard delay for each transfer (allow tag to be ready after last transmission?) - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x00; - c++; - } + if(MF_DBGLEVEL >= 4 && GetCountSspClk() >= (*timing & 0xfffffff8)) Dbprintf("TransmitFor14443a: Missed timing"); + while(GetCountSspClk() < (*timing & 0xfffffff8)); // Delay transfer (multiple of 8 MF clock ticks) + LastTimeProxToAirStart = *timing; + } else { + ThisTransferTime = ((MAX(NextTransferTime, GetCountSspClk()) & 0xfffffff8) + 8); + while(GetCountSspClk() < ThisTransferTime); + LastTimeProxToAirStart = ThisTransferTime; } - c = 0; + // clear TXRDY + AT91C_BASE_SSC->SSC_THR = SEC_Y; + + // for(uint16_t c = 0; c < 10;) { // standard delay for each transfer (allow tag to be ready after last transmission) + // if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { + // AT91C_BASE_SSC->SSC_THR = SEC_Y; + // c++; + // } + // } + + uint16_t c = 0; for(;;) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { AT91C_BASE_SSC->SSC_THR = cmd[c]; @@ -1293,88 +1223,91 @@ static void TransmitFor14443a(const uint8_t *cmd, int len, uint32_t *timing) } } } - + + NextTransferTime = MAX(NextTransferTime, LastTimeProxToAirStart + REQUEST_GUARD_TIME); + } + //----------------------------------------------------------------------------- // Prepare reader command (in bits, support short frames) to send to FPGA //----------------------------------------------------------------------------- void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, int bits, uint32_t dwParity) { - int i, j; - int last; - uint8_t b; - - ToSendReset(); - - // Start of Communication (Seq. Z) - ToSend[++ToSendMax] = SEC_Z; - last = 0; - - size_t bytecount = nbytes(bits); - // Generate send structure for the data bits - for (i = 0; i < bytecount; i++) { - // Get the current byte to send - b = cmd[i]; - size_t bitsleft = MIN((bits-(i*8)),8); - - for (j = 0; j < bitsleft; j++) { - if (b & 1) { - // Sequence X - ToSend[++ToSendMax] = SEC_X; - last = 1; - } else { - if (last == 0) { - // Sequence Z - ToSend[++ToSendMax] = SEC_Z; - } else { - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - last = 0; - } - } - b >>= 1; - } + int i, j; + int last; + uint8_t b; - // Only transmit (last) parity bit if we transmitted a complete byte - if (j == 8) { - // Get the parity bit - if ((dwParity >> i) & 0x01) { - // Sequence X - ToSend[++ToSendMax] = SEC_X; - last = 1; - } else { - if (last == 0) { - // Sequence Z - ToSend[++ToSendMax] = SEC_Z; - } else { - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - last = 0; - } - } - } - } + ToSendReset(); - // End of Communication - if (last == 0) { - // Sequence Z - ToSend[++ToSendMax] = SEC_Z; - } else { - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; - last = 0; - } - // Sequence Y - ToSend[++ToSendMax] = SEC_Y; + // Start of Communication (Seq. Z) + ToSend[++ToSendMax] = SEC_Z; + LastProxToAirDuration = 8 * (ToSendMax+1) - 6; + last = 0; + + size_t bytecount = nbytes(bits); + // Generate send structure for the data bits + for (i = 0; i < bytecount; i++) { + // Get the current byte to send + b = cmd[i]; + size_t bitsleft = MIN((bits-(i*8)),8); + + for (j = 0; j < bitsleft; j++) { + if (b & 1) { + // Sequence X + ToSend[++ToSendMax] = SEC_X; + LastProxToAirDuration = 8 * (ToSendMax+1) - 2; + last = 1; + } else { + if (last == 0) { + // Sequence Z + ToSend[++ToSendMax] = SEC_Z; + LastProxToAirDuration = 8 * (ToSendMax+1) - 6; + } else { + // Sequence Y + ToSend[++ToSendMax] = SEC_Y; + last = 0; + } + } + b >>= 1; + } + + // Only transmit (last) parity bit if we transmitted a complete byte + if (j == 8) { + // Get the parity bit + if ((dwParity >> i) & 0x01) { + // Sequence X + ToSend[++ToSendMax] = SEC_X; + LastProxToAirDuration = 8 * (ToSendMax+1) - 2; + last = 1; + } else { + if (last == 0) { + // Sequence Z + ToSend[++ToSendMax] = SEC_Z; + LastProxToAirDuration = 8 * (ToSendMax+1) - 6; + } else { + // Sequence Y + ToSend[++ToSendMax] = SEC_Y; + last = 0; + } + } + } + } - // Just to be sure! - ToSend[++ToSendMax] = SEC_Y; - ToSend[++ToSendMax] = SEC_Y; - ToSend[++ToSendMax] = SEC_Y; + // End of Communication: Logic 0 followed by Sequence Y + if (last == 0) { + // Sequence Z + ToSend[++ToSendMax] = SEC_Z; + LastProxToAirDuration = 8 * (ToSendMax+1) - 6; + } else { + // Sequence Y + ToSend[++ToSendMax] = SEC_Y; + last = 0; + } + ToSend[++ToSendMax] = SEC_Y; - // Convert from last character reference to length - ToSendMax++; + // Convert to length of command: + ToSendMax++; } //----------------------------------------------------------------------------- @@ -1390,7 +1323,7 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity) // Stop when button is pressed (return 1) or field was gone (return 2) // Or return 0 when command is captured //----------------------------------------------------------------------------- -static int EmGetCmd(uint8_t *received, int *len, int maxLen) +static int EmGetCmd(uint8_t *received, int *len) { *len = 0; @@ -1415,9 +1348,11 @@ static int EmGetCmd(uint8_t *received, int *len, int maxLen) AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START; // Now run a 'software UART' on the stream of incoming samples. + UartReset(); Uart.output = received; - Uart.byteCntMax = maxLen; - Uart.state = STATE_UNSYNCD; + + // Clear RXRDY: + uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; for(;;) { WDT_HIT(); @@ -1441,98 +1376,157 @@ static int EmGetCmd(uint8_t *received, int *len, int maxLen) analogAVG = 0; } } - // transmit none - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x00; - } + // receive and test the miller decoding - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - if(MillerDecoding((b & 0xf0) >> 4)) { - *len = Uart.byteCnt; - if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE); - return 0; - } - if(MillerDecoding(b & 0x0f)) { - *len = Uart.byteCnt; - if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE); + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { + b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + if(MillerDecoding(b, 0)) { + *len = Uart.len; return 0; } - } + } + } } -static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded) -{ - int i, u = 0; - uint8_t b = 0; +static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, bool correctionNeeded) +{ + uint8_t b; + uint16_t i = 0; + uint32_t ThisTransferTime; + // Modulate Manchester FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD); - AT91C_BASE_SSC->SSC_THR = 0x00; - FpgaSetupSsc(); - - // include correction bit - i = 1; - if((Uart.parityBits & 0x01) || correctionNeeded) { + + // include correction bit if necessary + if (Uart.parityBits & 0x01) { + correctionNeeded = TRUE; + } + if(correctionNeeded) { // 1236, so correction bit needed i = 0; + } else { + i = 1; } + + // clear receiving shift register and holding register + 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)); + 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 (uint16_t j = 0; j < 5; j++) { // allow timeout - better late than never + while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)); + if (AT91C_BASE_SSC->SSC_RHR) break; + } + + while ((ThisTransferTime = GetCountSspClk()) & 0x00000007); + + // Clear TXRDY: + AT91C_BASE_SSC->SSC_THR = SEC_F; + // send cycle - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - (void)b; - } + for(; i <= respLen; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - if(i > respLen) { - b = 0xff; // was 0x00 - u++; - } else { - b = resp[i]; - i++; - } - AT91C_BASE_SSC->SSC_THR = b; - - if(u > 4) break; + AT91C_BASE_SSC->SSC_THR = resp[i++]; + FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR; } + if(BUTTON_PRESS()) { break; } } + // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again: + for (i = 0; i < 2 ; ) { + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { + AT91C_BASE_SSC->SSC_THR = SEC_F; + FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + i++; + } + } + + LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0); + return 0; } -int EmSend4bitEx(uint8_t resp, int correctionNeeded){ - Code4bitAnswerAsTag(resp); +int EmSend4bitEx(uint8_t resp, bool correctionNeeded){ + Code4bitAnswerAsTag(resp); int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded); - if (tracing) LogTrace(&resp, 1, GetDeltaCountUS(), GetParity(&resp, 1), FALSE); + // do the tracing for the previous reader request and this tag answer: + EmLogTrace(Uart.output, + Uart.len, + Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.parityBits, + &resp, + 1, + LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, + (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, + SwapBits(GetParity(&resp, 1), 1)); return res; } int EmSend4bit(uint8_t resp){ - return EmSend4bitEx(resp, 0); + return EmSend4bitEx(resp, false); } -int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par){ - CodeIso14443aAsTagPar(resp, respLen, par); +int EmSendCmdExPar(uint8_t *resp, int respLen, bool correctionNeeded, uint32_t par){ + CodeIso14443aAsTagPar(resp, respLen, par); int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded); - if (tracing) LogTrace(resp, respLen, GetDeltaCountUS(), par, FALSE); + // do the tracing for the previous reader request and this tag answer: + EmLogTrace(Uart.output, + Uart.len, + Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, + Uart.parityBits, + resp, + respLen, + LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG, + (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG, + SwapBits(GetParity(resp, respLen), respLen)); return res; } -int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded){ +int EmSendCmdEx(uint8_t *resp, int respLen, bool correctionNeeded){ return EmSendCmdExPar(resp, respLen, correctionNeeded, GetParity(resp, respLen)); } int EmSendCmd(uint8_t *resp, int respLen){ - return EmSendCmdExPar(resp, respLen, 0, GetParity(resp, respLen)); + return EmSendCmdExPar(resp, respLen, false, GetParity(resp, respLen)); } int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par){ - return EmSendCmdExPar(resp, respLen, 0, par); + return EmSendCmdExPar(resp, respLen, false, par); +} + +bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint32_t reader_Parity, + uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint32_t tag_Parity) +{ + if (tracing) { + // we cannot exactly measure the end and start of a received command from reader. However we know that the delay from + // end of the received command to start of the tag's (simulated by us) answer is n*128+20 or n*128+84 resp. + // with n >= 9. The start of the tags answer can be measured and therefore the end of the received command be calculated: + uint16_t reader_modlen = reader_EndTime - reader_StartTime; + uint16_t approx_fdt = tag_StartTime - reader_EndTime; + uint16_t exact_fdt = (approx_fdt - 20 + 32)/64 * 64 + 20; + reader_EndTime = tag_StartTime - exact_fdt; + reader_StartTime = reader_EndTime - reader_modlen; + if (!LogTrace(reader_data, reader_len, reader_StartTime, reader_Parity, TRUE)) { + return FALSE; + } else if (!LogTrace(NULL, 0, reader_EndTime, 0, TRUE)) { + return FALSE; + } else if (!LogTrace(tag_data, tag_len, tag_StartTime, tag_Parity, FALSE)) { + return FALSE; + } else { + return (!LogTrace(NULL, 0, tag_EndTime, 0, FALSE)); + } + } else { + return TRUE; + } } //----------------------------------------------------------------------------- @@ -1540,9 +1534,9 @@ int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par){ // If a response is captured return TRUE // If it takes too long return FALSE //----------------------------------------------------------------------------- -static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint16_t offset, int maxLen, int *samples) +static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint16_t offset, int maxLen) { - int c; + uint16_t c; // Set FPGA mode to "reader listen mode", no modulation (listen // only, since we are receiving, not transmitting). @@ -1551,26 +1545,23 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint16_t offset, FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN); // Now get the answer from the card + DemodReset(); Demod.output = receivedResponse; - Demod.len = 0; - Demod.state = DEMOD_UNSYNCD; - - uint8_t b; + // clear RXRDY: + uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + c = 0; for(;;) { WDT_HIT(); - // if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - // AT91C_BASE_SSC->SSC_THR = 0x00; // To make use of exact timing of next command from reader!! - // if (elapsed) (*elapsed)++; - // } if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - if(c < iso14a_timeout) { c++; } else { return FALSE; } b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; - if(ManchesterDecoding(b, offset)) { - *samples = Demod.samples; + if(ManchesterDecoding(b, offset, 0)) { + NextTransferTime = MAX(NextTransferTime, Demod.endTime - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/16 + FRAME_DELAY_TIME_PICC_TO_PCD); return TRUE; + } else if(c++ > iso14a_timeout) { + return FALSE; } } } @@ -1579,15 +1570,18 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint16_t offset, void ReaderTransmitBitsPar(uint8_t* frame, int bits, uint32_t par, uint32_t *timing) { - CodeIso14443aBitsAsReaderPar(frame,bits,par); + CodeIso14443aBitsAsReaderPar(frame,bits,par); - // Send command to tag - TransmitFor14443a(ToSend, ToSendMax, timing); - if(trigger) - LED_A_ON(); + // Send command to tag + TransmitFor14443a(ToSend, ToSendMax, timing); + if(trigger) + LED_A_ON(); - // Log reader command in trace buffer - if (tracing) LogTrace(frame,nbytes(bits),0,par,TRUE); + // Log reader command in trace buffer + if (tracing) { + LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, par, TRUE); + LogTrace(NULL, 0, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, 0, TRUE); + } } void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par, uint32_t *timing) @@ -1609,10 +1603,11 @@ void ReaderTransmit(uint8_t* frame, int len, uint32_t *timing) int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset) { - int samples = 0; - if (!GetIso14443aAnswerFromTag(receivedAnswer,offset,160,&samples)) return FALSE; - if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE); - if(samples == 0) return FALSE; + if (!GetIso14443aAnswerFromTag(receivedAnswer,offset,160)) return FALSE; + if (tracing) { + LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.parityBits, FALSE); + LogTrace(NULL, 0, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, 0, FALSE); + } return Demod.len; } @@ -1623,11 +1618,12 @@ int ReaderReceive(uint8_t* receivedAnswer) int ReaderReceivePar(uint8_t *receivedAnswer, uint32_t *parptr) { - int samples = 0; - if (!GetIso14443aAnswerFromTag(receivedAnswer,0,160,&samples)) return FALSE; - if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE); + if (!GetIso14443aAnswerFromTag(receivedAnswer,0,160)) return FALSE; + if (tracing) { + LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.parityBits, FALSE); + LogTrace(NULL, 0, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, 0, FALSE); + } *parptr = Demod.parityBits; - if(samples == 0) return FALSE; return Demod.len; } @@ -1649,6 +1645,7 @@ int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, u // Broadcast for a card, WUPA (0x52) will force response from all cards in the field ReaderTransmitBitsPar(wupa,7,0, NULL); + // Receive the ATQA if(!ReaderReceive(resp)) return 0; // Dbprintf("atqa: %02x %02x",resp[0],resp[1]); @@ -1707,7 +1704,7 @@ int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, u memcpy(uid_resp,resp,4); } uid_resp_len = 4; - // Dbprintf("uid: %02x %02x %02x %02x",uid_resp[0],uid_resp[1],uid_resp[2],uid_resp[3]); + // Dbprintf("uid: %02x %02x %02x %02x",uid_resp[0],uid_resp[1],uid_resp[2],uid_resp[3]); // calculate crypto UID. Always use last 4 Bytes. if(cuid_ptr) { @@ -1768,25 +1765,28 @@ int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, u return 1; } -void iso14443a_setup() { +void iso14443a_setup(uint8_t fpga_minor_mode) { // Set up the synchronous serial port FpgaSetupSsc(); - // Start from off (no field generated) - // Signal field is off with the appropriate LED -// LED_D_OFF(); -// FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - // SpinDelay(50); - + // connect Demodulated Signal to ADC: SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - // Now give it time to spin up. // Signal field is on with the appropriate LED - LED_D_ON(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - SpinDelay(7); // iso14443-3 specifies 5ms max. + if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD + || fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN) { + LED_D_ON(); + } else { + LED_D_OFF(); + } + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | fpga_minor_mode); - Demod.state = DEMOD_UNSYNCD; - iso14a_timeout = 2048; //default + // Start the timer + StartCountSspClk(); + + DemodReset(); + UartReset(); + NextTransferTime = 2*DELAY_ARM2AIR_AS_READER; + iso14a_set_timeout(1050); // 10ms default } int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) { @@ -1820,10 +1820,10 @@ int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) { // Read an ISO 14443a tag. Send out commands and store answers. // //----------------------------------------------------------------------------- -void ReaderIso14443a(UsbCommand * c) +void ReaderIso14443a(UsbCommand *c) { iso14a_command_t param = c->arg[0]; - uint8_t * cmd = c->d.asBytes; + uint8_t *cmd = c->d.asBytes; size_t len = c->arg[1]; size_t lenbits = c->arg[2]; uint32_t arg0 = 0; @@ -1833,14 +1833,14 @@ void ReaderIso14443a(UsbCommand * c) iso14a_clear_trace(); } - iso14a_set_tracing(true); + iso14a_set_tracing(TRUE); if(param & ISO14A_REQUEST_TRIGGER) { - iso14a_set_trigger(1); + iso14a_set_trigger(TRUE); } if(param & ISO14A_CONNECT) { - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); if(!(param & ISO14A_NO_SELECT)) { iso14a_card_select_t *card = (iso14a_card_select_t*)buf; arg0 = iso14443a_select_card(NULL,card,NULL); @@ -1852,10 +1852,6 @@ void ReaderIso14443a(UsbCommand * c) iso14a_timeout = c->arg[2]; } - if(param & ISO14A_SET_TIMEOUT) { - iso14a_timeout = c->arg[2]; - } - if(param & ISO14A_APDU) { arg0 = iso14_apdu(cmd, len, buf); cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf)); @@ -1876,7 +1872,7 @@ void ReaderIso14443a(UsbCommand * c) } if(param & ISO14A_REQUEST_TRIGGER) { - iso14a_set_trigger(0); + iso14a_set_trigger(FALSE); } if(param & ISO14A_NO_DISCONNECT) { @@ -1926,8 +1922,9 @@ void ReaderMifare(bool first_try) static uint8_t mf_nr_ar3; uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); + iso14a_clear_trace(); - tracing = false; + iso14a_set_tracing(TRUE); byte_t nt_diff = 0; byte_t par = 0; @@ -1952,11 +1949,9 @@ void ReaderMifare(bool first_try) if (first_try) { - StartCountMifare(); mf_nr_ar3 = 0; - iso14443a_setup(); - while((GetCountMifare() & 0xffff0000) != 0x10000); // wait for counter to reset and "warm up" - sync_time = GetCountMifare() & 0xfffffff8; + iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); + sync_time = GetCountSspClk() & 0xfffffff8; sync_cycles = 65536; // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces). nt_attacked = 0; nt = 0; @@ -1974,7 +1969,7 @@ void ReaderMifare(bool first_try) LED_B_OFF(); LED_C_OFF(); - + for(uint16_t i = 0; TRUE; i++) { WDT_HIT(); @@ -1991,14 +1986,11 @@ void ReaderMifare(bool first_try) continue; } - //keep the card active - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles; catch_up_cycles = 0; // if we missed the sync time already, advance to the next nonce repeat - while(GetCountMifare() > sync_time) { + while(GetCountSspClk() > sync_time) { sync_time = (sync_time & 0xfffffff8) + sync_cycles; } @@ -2092,9 +2084,6 @@ void ReaderMifare(bool first_try) } } - LogTrace((const uint8_t *)&nt, 4, 0, GetParity((const uint8_t *)&nt, 4), TRUE); - LogTrace(par_list, 8, 0, GetParity(par_list, 8), TRUE); - LogTrace(ks_list, 8, 0, GetParity(ks_list, 8), TRUE); mf_nr_ar[3] &= 0x1F; @@ -2110,7 +2099,8 @@ void ReaderMifare(bool first_try) // Thats it... FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LEDsoff(); - tracing = TRUE; + + iso14a_set_tracing(FALSE); } /** @@ -2157,7 +2147,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04}; uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00}; - + //Here, we collect UID,NT,AR,NR,UID2,NT2,AR2,NR2 // This can be used in a reader-only attack. // (it can also be retrieved via 'hf 14a list', but hey... @@ -2165,31 +2155,27 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * uint8_t ar_nr_collected = 0; // clear trace - iso14a_clear_trace(); - - tracing = true; + iso14a_clear_trace(); + iso14a_set_tracing(TRUE); - // Authenticate response - nonce + // Authenticate response - nonce uint32_t nonce = bytes_to_num(rAUTH_NT, 4); - + //-- Determine the UID // Can be set from emulator memory, incoming data // and can be 7 or 4 bytes long - if(flags & FLAG_4B_UID_IN_DATA) + if (flags & FLAG_4B_UID_IN_DATA) { // 4B uid comes from data-portion of packet memcpy(rUIDBCC1,datain,4); rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; - }else if(flags & FLAG_7B_UID_IN_DATA) - { + } else if (flags & FLAG_7B_UID_IN_DATA) { // 7B uid comes from data-portion of packet memcpy(&rUIDBCC1[1],datain,3); memcpy(rUIDBCC2, datain+3, 4); _7BUID = true; - } - else - { + } else { // get UID from emul memory emlGetMemBt(receivedCmd, 7, 1); _7BUID = !(receivedCmd[0] == 0x00); @@ -2200,40 +2186,31 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * emlGetMemBt(rUIDBCC2, 3, 4); } } + /* * Regardless of what method was used to set the UID, set fifth byte and modify * the ATQA for 4 or 7-byte UID */ - rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3]; - if(_7BUID) - { + if (_7BUID) { rATQA[0] = 0x44; rUIDBCC1[0] = 0x88; rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3]; } - // start mkseconds counter - StartCountUS(); - // We need to listen to the high-frequency, peak-detected path. - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); - SpinDelay(200); if (MF_DBGLEVEL >= 1) { if (!_7BUID) { Dbprintf("4B UID: %02x%02x%02x%02x",rUIDBCC1[0] , rUIDBCC1[1] , rUIDBCC1[2] , rUIDBCC1[3]); - }else - { + } else { Dbprintf("7B UID: (%02x)%02x%02x%02x%02x%02x%02x%02x",rUIDBCC1[0] , rUIDBCC1[1] , rUIDBCC1[2] , rUIDBCC1[3],rUIDBCC2[0],rUIDBCC2[1] ,rUIDBCC2[2] , rUIDBCC2[3]); } } - // calibrate mkseconds counter - GetDeltaCountUS(); - bool finished = false; + + bool finished = FALSE; while (!BUTTON_PRESS() && !finished) { WDT_HIT(); @@ -2251,14 +2228,15 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * //Now, get data - res = EmGetCmd(receivedCmd, &len, RECV_CMD_SIZE); // (+ nextCycleTimeout) + res = EmGetCmd(receivedCmd, &len); if (res == 2) { //Field is off! cardSTATE = MFEMUL_NOFIELD; LEDsoff(); continue; - }else if(res == 1) break;//return value 1 means button press - - + } else if (res == 1) { + break; //return value 1 means button press + } + // REQ or WUP request in ANY state and WUP in HALTED state if (len == 1 && ((receivedCmd[0] == 0x26 && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == 0x52)) { selTimer = GetTickCount(); @@ -2272,11 +2250,13 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * cardAUTHKEY = 0xff; continue; } - + switch (cardSTATE) { case MFEMUL_NOFIELD: case MFEMUL_HALTED: case MFEMUL_IDLE:{ + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); break; } case MFEMUL_SELECT1:{ @@ -2294,12 +2274,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * // select card if (len == 9 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) { - - if (!_7BUID) - EmSendCmd(rSAK, sizeof(rSAK)); - else - EmSendCmd(rSAK1, sizeof(rSAK1)); - + EmSendCmd(_7BUID?rSAK1:rSAK, sizeof(_7BUID?rSAK1:rSAK)); cuid = bytes_to_num(rUIDBCC1, 4); if (!_7BUID) { cardSTATE = MFEMUL_WORK; @@ -2308,16 +2283,16 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * break; } else { cardSTATE = MFEMUL_SELECT2; - break; } } - break; } case MFEMUL_AUTH1:{ if( len != 8) { cardSTATE_TO_IDLE(); + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); break; } uint32_t ar = bytes_to_num(receivedCmd, 4); @@ -2342,10 +2317,12 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * // test if auth OK if (cardRr != prng_successor(nonce, 64)){ if (MF_DBGLEVEL >= 2) Dbprintf("AUTH FAILED. cardRr=%08x, succ=%08x",cardRr, prng_successor(nonce, 64)); - //Shouldn't we respond anything here? + // Shouldn't we respond anything here? // Right now, we don't nack or anything, which causes the // reader to do a WUPA after a while. /Martin cardSTATE_TO_IDLE(); + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); break; } @@ -2360,8 +2337,11 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * break; } case MFEMUL_SELECT2:{ - if (!len) break; - + if (!len) { + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); + break; + } if (len == 2 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x20)) { EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2)); break; @@ -2371,7 +2351,6 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * if (len == 9 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0)) { EmSendCmd(rSAK, sizeof(rSAK)); - cuid = bytes_to_num(rUIDBCC2, 4); cardSTATE = MFEMUL_WORK; LED_B_ON(); @@ -2380,22 +2359,30 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * } // i guess there is a command). go into the work state. - if (len != 4) break; + if (len != 4) { + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); + break; + } cardSTATE = MFEMUL_WORK; //goto lbWORK; //intentional fall-through to the next case-stmt } - case MFEMUL_WORK:{ - if (len == 0) break; + case MFEMUL_WORK:{ + if (len == 0) { + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); + break; + } + bool encrypted_data = (cardAUTHKEY != 0xFF) ; - if(encrypted_data) - { + if(encrypted_data) { // decrypt seqence mf_crypto1_decrypt(pcs, receivedCmd, len); } - + if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) { authTimer = GetTickCount(); cardAUTHSC = receivedCmd[1] / 4; // received block num @@ -2408,10 +2395,9 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * crypto1_word(pcs, cuid ^ nonce, 0);//Update crypto state num_to_bytes(nonce, 4, rAUTH_AT); // Send nonce - } - else{ // nested authentication + } else { // nested authentication if (MF_DBGLEVEL >= 2) Dbprintf("Reader doing nested authentication for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY ); - ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); + ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); num_to_bytes(ans, 4, rAUTH_AT); } EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT)); @@ -2419,7 +2405,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * cardSTATE = MFEMUL_AUTH1; break; } - + // rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued // BUT... ACK --> NACK if (len == 1 && receivedCmd[0] == CARD_ACK) { @@ -2433,25 +2419,25 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * break; } - if(len != 4) break; + if(len != 4) { + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); + break; + } if(receivedCmd[0] == 0x30 // read block || receivedCmd[0] == 0xA0 // write block || receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2 // inc dec restore - || receivedCmd[0] == 0xB0) // transfer - { - if (receivedCmd[1] >= 16 * 4) - { - + || receivedCmd[0] == 0xB0) { // transfer + if (receivedCmd[1] >= 16 * 4) { EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]); break; } - if (receivedCmd[1] / 4 != cardAUTHSC) - { + if (receivedCmd[1] / 4 != cardAUTHSC) { EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd[0],receivedCmd[1],cardAUTHSC); break; @@ -2467,8 +2453,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * mf_crypto1_encrypt(pcs, response, 18, &par); EmSendCmdPar(response, 18, par); numReads++; - if(exitAfterNReads > 0 && numReads == exitAfterNReads) - { + if(exitAfterNReads > 0 && numReads == exitAfterNReads) { Dbprintf("%d reads done, exiting", numReads); finished = true; } @@ -2477,17 +2462,14 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * // write block if (receivedCmd[0] == 0xA0) { if (MF_DBGLEVEL >= 2) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd[1],receivedCmd[1]); - EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); - //nextCycleTimeout = 50; cardSTATE = MFEMUL_WRITEBL2; cardWRBL = receivedCmd[1]; break; - } + } // increment, decrement, restore if (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2) { if (MF_DBGLEVEL >= 2) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]); - if (emlCheckValBl(receivedCmd[1])) { if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate on block, but emlCheckValBl failed, nacking"); EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); @@ -2501,28 +2483,25 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * if (receivedCmd[0] == 0xC2) cardSTATE = MFEMUL_INTREG_REST; cardWRBL = receivedCmd[1]; - break; } - // transfer if (receivedCmd[0] == 0xB0) { if (MF_DBGLEVEL >= 2) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]); - if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1])) EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); else EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); - break; } - // halt if (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00) { LED_B_OFF(); LED_C_OFF(); cardSTATE = MFEMUL_HALTED; if (MF_DBGLEVEL >= 4) Dbprintf("--> HALTED. Selected time: %d ms", GetTickCount() - selTimer); + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); break; } // RATS @@ -2530,12 +2509,9 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); break; } - // command not allowed if (MF_DBGLEVEL >= 4) Dbprintf("Received command not allowed, nacking"); EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); - - // case break break; } case MFEMUL_WRITEBL2:{ @@ -2544,10 +2520,10 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * emlSetMem(receivedCmd, cardWRBL, 1); EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); cardSTATE = MFEMUL_WORK; - break; } else { cardSTATE_TO_IDLE(); - break; + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); } break; } @@ -2559,7 +2535,9 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA)); cardSTATE_TO_IDLE(); break; - } + } + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); cardINTREG = cardINTREG + ans; cardSTATE = MFEMUL_WORK; break; @@ -2572,6 +2550,8 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * cardSTATE_TO_IDLE(); break; } + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); cardINTREG = cardINTREG - ans; cardSTATE = MFEMUL_WORK; break; @@ -2584,6 +2564,8 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * cardSTATE_TO_IDLE(); break; } + LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parityBits, TRUE); + LogTrace(NULL, 0, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, 0, TRUE); cardSTATE = MFEMUL_WORK; break; } @@ -2593,9 +2575,6 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LEDsoff(); - // add trace trailer - memset(rAUTH_NT, 0x44, 4); - LogTrace(rAUTH_NT, 4, 0, 0, TRUE); if(flags & FLAG_INTERACTIVE)// Interactive mode flag, means we need to send ACK { //May just aswell send the collected ar_nr in the response aswell @@ -2603,8 +2582,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * } if(flags & FLAG_NR_AR_ATTACK) { - if(ar_nr_collected > 1) - { + if(ar_nr_collected > 1) { Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:"); Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x", ar_nr_responses[0], // UID @@ -2614,11 +2592,9 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t * ar_nr_responses[6], //AR2 ar_nr_responses[7] //NR2 ); - }else - { + } else { Dbprintf("Failed to obtain two AR/NR pairs!"); - if(ar_nr_collected >0) - { + if(ar_nr_collected >0) { Dbprintf("Only got these: UID=%08d, nonce=%08d, AR1=%08d, NR1=%08d", ar_nr_responses[0], // UID ar_nr_responses[1], //NT @@ -2659,71 +2635,73 @@ void RAMFUNC SniffMifare(uint8_t param) { //uint8_t *trace = (uint8_t *)BigBuf; // The DMA buffer, used to stream samples from the FPGA - int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET; - int8_t *data = dmaBuf; + uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET; + uint8_t *data = dmaBuf; + uint8_t previous_data = 0; int maxDataLen = 0; int dataLen = 0; + bool ReaderIsActive = FALSE; + bool TagIsActive = FALSE; + + iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER); // Set up the demodulator for tag -> reader responses. Demod.output = receivedResponse; - Demod.len = 0; - Demod.state = DEMOD_UNSYNCD; // Set up the demodulator for the reader -> tag commands - memset(&Uart, 0, sizeof(Uart)); Uart.output = receivedCmd; - Uart.byteCntMax = 32; // was 100 (greg)////////////////// - Uart.state = STATE_UNSYNCD; // Setup for the DMA. - FpgaSetupSsc(); - FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); + FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer. - // And put the FPGA in the appropriate mode - // Signal field is off with the appropriate LED LED_D_OFF(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER); - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // init sniffer MfSniffInit(); - int sniffCounter = 0; // And now we loop, receiving samples. - while(true) { + for(uint32_t sniffCounter = 0; TRUE; ) { + if(BUTTON_PRESS()) { DbpString("cancelled by button"); - goto done; + break; } LED_A_ON(); WDT_HIT(); - if (++sniffCounter > 65) { - if (MfSniffSend(2000)) { - FpgaEnableSscDma(); + if ((sniffCounter & 0x0000FFFF) == 0) { // from time to time + // check if a transaction is completed (timeout after 2000ms). + // if yes, stop the DMA transfer and send what we have so far to the client + if (MfSniffSend(2000)) { + // Reset everything - we missed some sniffed data anyway while the DMA was stopped + sniffCounter = 0; + data = dmaBuf; + maxDataLen = 0; + ReaderIsActive = FALSE; + TagIsActive = FALSE; + FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer. } - sniffCounter = 0; } - - int register readBufDataP = data - dmaBuf; - int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR; - if (readBufDataP <= dmaBufDataP){ - dataLen = dmaBufDataP - readBufDataP; - } else { - dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1; + + int register readBufDataP = data - dmaBuf; // number of bytes we have processed so far + int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR; // number of bytes already transferred + if (readBufDataP <= dmaBufDataP){ // we are processing the same block of data which is currently being transferred + dataLen = dmaBufDataP - readBufDataP; // number of bytes still to be processed + } else { + dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP; // number of bytes still to be processed } // test for length of buffer - if(dataLen > maxDataLen) { - maxDataLen = dataLen; + if(dataLen > maxDataLen) { // we are more behind than ever... + maxDataLen = dataLen; if(dataLen > 400) { Dbprintf("blew circular buffer! dataLen=0x%x", dataLen); - goto done; + break; } } if(dataLen < 1) continue; - // primary buffer was stopped( <-- we lost data! + // primary buffer was stopped ( <-- we lost data! if (!AT91C_BASE_PDC_SSC->PDC_RCR) { AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf; AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE; @@ -2737,44 +2715,51 @@ void RAMFUNC SniffMifare(uint8_t param) { LED_A_OFF(); - if(MillerDecoding((data[0] & 0xF0) >> 4)) { - LED_C_INV(); - // check - if there is a short 7bit request from reader - if (MfSniffLogic(receivedCmd, Uart.byteCnt, Uart.parityBits, Uart.bitCnt, TRUE)) break; - - /* And ready to receive another command. */ - Uart.state = STATE_UNSYNCD; - - /* And also reset the demod code */ - Demod.state = DEMOD_UNSYNCD; - } + if (sniffCounter & 0x01) { - if(ManchesterDecoding(data[0], 0)) { - LED_C_INV(); + if(!TagIsActive) { // no need to try decoding tag data if the reader is sending + uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4); + if(MillerDecoding(readerdata, (sniffCounter-1)*4)) { + LED_C_INV(); + if (MfSniffLogic(receivedCmd, Uart.len, Uart.parityBits, Uart.bitCount, TRUE)) break; - if (MfSniffLogic(receivedResponse, Demod.len, Demod.parityBits, Demod.bitCount, FALSE)) break; + /* And ready to receive another command. */ + UartReset(); + + /* And also reset the demod code */ + DemodReset(); + } + ReaderIsActive = (Uart.state != STATE_UNSYNCD); + } + + if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending + uint8_t tagdata = (previous_data << 4) | (*data & 0x0F); + if(ManchesterDecoding(tagdata, 0, (sniffCounter-1)*4)) { + LED_C_INV(); - // And ready to receive another response. - memset(&Demod, 0, sizeof(Demod)); - Demod.output = receivedResponse; - Demod.state = DEMOD_UNSYNCD; + if (MfSniffLogic(receivedResponse, Demod.len, Demod.parityBits, Demod.bitCount, FALSE)) break; - /* And also reset the uart code */ - Uart.state = STATE_UNSYNCD; + // And ready to receive another response. + DemodReset(); + } + TagIsActive = (Demod.state != DEMOD_UNSYNCD); + } } + previous_data = *data; + sniffCounter++; data++; if(data > dmaBuf + DMA_BUFFER_SIZE) { data = dmaBuf; } + } // main cycle DbpString("COMMAND FINISHED"); -done: FpgaDisableSscDma(); MfSniffEnd(); - Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x Uart.byteCntMax=%x", maxDataLen, Uart.state, Uart.byteCnt, Uart.byteCntMax); + Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len); LEDsoff(); } diff --git a/armsrc/iso14443a.h b/armsrc/iso14443a.h index 2a2b3403..6d18515f 100644 --- a/armsrc/iso14443a.h +++ b/armsrc/iso14443a.h @@ -25,21 +25,31 @@ typedef struct { enum { DEMOD_UNSYNCD, - DEMOD_HALF_SYNCD, - DEMOD_MOD_FIRST_HALF, - DEMOD_NOMOD_FIRST_HALF, + // DEMOD_HALF_SYNCD, + // DEMOD_MOD_FIRST_HALF, + // DEMOD_NOMOD_FIRST_HALF, DEMOD_MANCHESTER_DATA } state; + uint16_t twoBits; + uint16_t highCnt; uint16_t bitCount; uint16_t collisionPos; uint16_t syncBit; - uint16_t parityBits; + uint32_t parityBits; uint16_t shiftReg; uint16_t samples; uint16_t len; + uint32_t startTime, endTime; uint8_t *output; } tDemod; +typedef enum { + MOD_NOMOD = 0, + MOD_SECOND_HALF, + MOD_FIRST_HALF, + MOD_BOTH_HALVES + } Modulation_t; + typedef struct { enum { STATE_UNSYNCD, @@ -47,27 +57,24 @@ typedef struct { STATE_MILLER_X, STATE_MILLER_Y, STATE_MILLER_Z, - STATE_ERROR_WAIT - } state; - uint16_t shiftReg; - int bitCnt; - int byteCnt; - int byteCntMax; - int posCnt; - int syncBit; - int parityBits; - int samples; - int highCnt; - int bitBuffer; - enum { - DROP_NONE, - DROP_FIRST_HALF, - DROP_SECOND_HALF - } drop; - uint8_t *output; + // DROP_NONE, + // DROP_FIRST_HALF, + } state; + uint16_t shiftReg; + uint16_t bitCount; + uint16_t len; + uint16_t byteCntMax; + uint16_t posCnt; + uint16_t syncBit; + uint32_t parityBits; + uint16_t highCnt; + uint16_t twoBits; + uint32_t startTime, endTime; + uint8_t *output; } tUart; + extern byte_t oddparity (const byte_t bt); extern uint32_t GetParity(const uint8_t *pbtCmd, int iLen); extern void AppendCrc14443a(uint8_t *data, int len); @@ -78,7 +85,7 @@ extern void ReaderTransmitPar(uint8_t *frame, int len, uint32_t par, uint32_t *t extern int ReaderReceive(uint8_t *receivedAnswer); extern int ReaderReceivePar(uint8_t *receivedAnswer, uint32_t *parptr); -extern void iso14443a_setup(); +extern void iso14443a_setup(uint8_t fpga_minor_mode); extern int iso14_apdu(uint8_t *cmd, size_t cmd_len, void *data); extern int iso14443a_select_card(uint8_t *uid_ptr, iso14a_card_select_t *resp_data, uint32_t *cuid_ptr); extern void iso14a_set_trigger(bool enable); diff --git a/armsrc/mifarecmd.c b/armsrc/mifarecmd.c index cbad7a90..c934a280 100644 --- a/armsrc/mifarecmd.c +++ b/armsrc/mifarecmd.c @@ -38,7 +38,7 @@ void MifareReadBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) iso14a_clear_trace(); // iso14a_set_tracing(false); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -107,7 +107,7 @@ void MifareUReadBlock(uint8_t arg0,uint8_t *datain) // clear trace iso14a_clear_trace(); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -173,7 +173,7 @@ void MifareReadSector(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) iso14a_clear_trace(); // iso14a_set_tracing(false); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -260,7 +260,7 @@ void MifareUReadCard(uint8_t arg0, uint8_t *datain) iso14a_clear_trace(); // iso14a_set_tracing(false); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -293,7 +293,7 @@ void MifareUReadCard(uint8_t arg0, uint8_t *datain) LogTrace(uid, 4, 0, 0, TRUE); LED_B_ON(); - cmd_send(CMD_ACK,isOK,0,0,dataoutbuf,64); + cmd_send(CMD_ACK,isOK,0,0,dataoutbuf,64); //cmd_send(CMD_ACK,isOK,0,0,dataoutbuf+32, 32); LED_B_OFF(); @@ -332,7 +332,7 @@ void MifareWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) iso14a_clear_trace(); // iso14a_set_tracing(false); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -405,7 +405,7 @@ void MifareUWriteBlock(uint8_t arg0, uint8_t *datain) iso14a_clear_trace(); // iso14a_set_tracing(false); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -467,7 +467,7 @@ void MifareUWriteBlock_Special(uint8_t arg0, uint8_t *datain) iso14a_clear_trace(); // iso14a_set_tracing(false); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -554,20 +554,16 @@ void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t calibrate, uint8_t *dat uint32_t auth1_time, auth2_time; static uint16_t delta_time; - StartCountMifare(); - // clear trace iso14a_clear_trace(); iso14a_set_tracing(false); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_C_OFF(); - while((GetCountMifare() & 0xffff0000) != 0x00010000); // wait for counter to reset and "warm up" - // statistics on nonce distance if (calibrate) { // for first call only. Otherwise reuse previous calibration LED_B_ON(); @@ -767,7 +763,7 @@ void MifareChkKeys(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain) iso14a_clear_trace(); iso14a_set_tracing(TRUE); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -874,7 +870,7 @@ void MifareECardLoad(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai iso14a_clear_trace(); iso14a_set_tracing(false); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -992,7 +988,7 @@ void MifareCSetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai iso14a_clear_trace(); iso14a_set_tracing(TRUE); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -1130,7 +1126,7 @@ void MifareCGetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai iso14a_clear_trace(); iso14a_set_tracing(TRUE); - iso14443a_setup(); + iso14443a_setup(FPGA_HF_ISO14443A_READER_LISTEN); LED_A_ON(); LED_B_OFF(); @@ -1144,7 +1140,7 @@ void MifareCGetBlock(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datai while (true) { if (workFlags & 0x02) { - ReaderTransmitBitsPar(wupC1,7,0, NULL); + ReaderTransmitBitsPar(wupC1,7,0, NULL); if(!ReaderReceive(receivedAnswer) || (receivedAnswer[0] != 0x0a)) { if (MF_DBGLEVEL >= 1) Dbprintf("wupC1 error"); break; diff --git a/armsrc/mifaresniff.c b/armsrc/mifaresniff.c index f95ca3df..bd9840e8 100644 --- a/armsrc/mifaresniff.c +++ b/armsrc/mifaresniff.c @@ -17,104 +17,95 @@ static uint8_t sniffUID[8]; static uint8_t sniffATQA[2]; static uint8_t sniffSAK; static uint8_t sniffBuf[16]; -static int timerData = 0; +static uint32_t timerData = 0; -int MfSniffInit(void){ - rsamples = 0; +bool MfSniffInit(void){ memset(sniffUID, 0x00, 8); memset(sniffATQA, 0x00, 2); sniffSAK = 0; sniffUIDType = SNF_UID_4; - return 0; + return FALSE; } -int MfSniffEnd(void){ -// UsbCommand ack = {CMD_ACK, {0, 0, 0}}; - +bool MfSniffEnd(void){ LED_B_ON(); - cmd_send(CMD_ACK,0,0,0,0,0); -// UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand)); + cmd_send(CMD_ACK,0,0,0,0,0); LED_B_OFF(); - return 0; + return FALSE; } -int RAMFUNC MfSniffLogic(const uint8_t * data, int len, uint32_t parity, int bitCnt, int reader) { +bool RAMFUNC MfSniffLogic(const uint8_t *data, uint16_t len, uint32_t parity, uint16_t bitCnt, bool reader) { - if ((len == 1) && (bitCnt = 9) && (data[0] > 0x0F)) { + if (reader && (len == 1) && (bitCnt == 7)) { // reset on 7-Bit commands from reader sniffState = SNF_INIT; } switch (sniffState) { case SNF_INIT:{ - if ((reader) && (len == 1) && (bitCnt == 9) && ((data[0] == 0x26) || (data[0] == 0x52))) { + if ((len == 1) && (reader) && (bitCnt == 7) ) { // REQA or WUPA from reader sniffUIDType = SNF_UID_4; memset(sniffUID, 0x00, 8); memset(sniffATQA, 0x00, 2); sniffSAK = 0; - sniffState = SNF_WUPREQ; } break; } case SNF_WUPREQ:{ - if ((!reader) && (len == 2)) { + if ((!reader) && (len == 2)) { // ATQA from tag memcpy(sniffATQA, data, 2); - sniffState = SNF_ATQA; } break; } case SNF_ATQA:{ - if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20)) { + if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20)) { // Select ALL from reader sniffState = SNF_ANTICOL1; } break; } case SNF_ANTICOL1:{ - if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { + if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // UID from tag (CL1) memcpy(sniffUID + 3, data, 4); - sniffState = SNF_UID1; } break; } case SNF_UID1:{ - if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) { + if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) { // Select 4 Byte UID from reader sniffState = SNF_SAK; } break; } case SNF_SAK:{ - if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { + if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card? sniffSAK = data[0]; - if (sniffUID[3] == 0x88) { + if (sniffUID[3] == 0x88) { // CL2 UID part to be expected sniffState = SNF_ANTICOL2; - } else { + } else { // select completed sniffState = SNF_CARD_IDLE; } } break; } case SNF_ANTICOL2:{ - if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { + if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // CL2 UID memcpy(sniffUID, data, 4); sniffUIDType = SNF_UID_7; - sniffState = SNF_UID2; - } + } break; } case SNF_UID2:{ - if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) { + if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) { // Select 2nd part of 7 Byte UID sniffState = SNF_SAK; - Dbprintf("SNF_SAK"); } break; } - case SNF_CARD_IDLE:{ + case SNF_CARD_IDLE:{ // trace the card select sequence sniffBuf[0] = 0xFF; sniffBuf[1] = 0xFF; memcpy(sniffBuf + 2, sniffUID, 7); @@ -123,18 +114,15 @@ int RAMFUNC MfSniffLogic(const uint8_t * data, int len, uint32_t parity, int bit sniffBuf[12] = 0xFF; sniffBuf[13] = 0xFF; LogTrace(sniffBuf, 14, 0, parity, true); - timerData = GetTickCount(); - } - case SNF_CARD_CMD:{ + } // intentionally no break; + case SNF_CARD_CMD:{ LogTrace(data, len, 0, parity, true); - sniffState = SNF_CARD_RESP; timerData = GetTickCount(); break; } case SNF_CARD_RESP:{ LogTrace(data, len, 0, parity, false); - sniffState = SNF_CARD_CMD; timerData = GetTickCount(); break; @@ -145,51 +133,40 @@ int RAMFUNC MfSniffLogic(const uint8_t * data, int len, uint32_t parity, int bit break; } - return 0; + + return FALSE; } -int RAMFUNC MfSniffSend(int maxTimeoutMs) { - if (traceLen && (timerData + maxTimeoutMs < GetTickCount())) { +bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) { + if (traceLen && (GetTickCount() > timerData + maxTimeoutMs)) { return intMfSniffSend(); } - return 0; + return FALSE; } -// internal seding function. not a RAMFUNC. -int intMfSniffSend() { - +// internal sending function. not a RAMFUNC. +bool intMfSniffSend() { + int pckSize = 0; int pckLen = traceLen; int pckNum = 0; - - if (!traceLen) return 0; FpgaDisableSscDma(); - while (pckLen > 0) { - pckSize = MIN(32, pckLen); -// UsbCommand ack = {CMD_ACK, {1, pckSize, pckNum}}; -// memcpy(ack.d.asBytes, trace + traceLen - pckLen, pckSize); - + pckSize = MIN(USB_CMD_DATA_SIZE, pckLen); LED_B_ON(); - cmd_send(CMD_ACK,1,pckSize,pckNum,trace + traceLen - pckLen,pckSize); -// UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand)); -// SpinDelay(20); + cmd_send(CMD_ACK, 1, pckSize, pckNum, trace + traceLen - pckLen, pckSize); LED_B_OFF(); pckLen -= pckSize; pckNum++; } -// UsbCommand ack = {CMD_ACK, {2, 0, 0}}; - LED_B_ON(); - cmd_send(CMD_ACK,2,0,0,0,0); -// UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand)); + cmd_send(CMD_ACK,2,0,0,0,0); LED_B_OFF(); - traceLen = 0; - memset(trace, 0x44, TRACE_SIZE); + iso14a_clear_trace(); - return 1; + return TRUE; } diff --git a/armsrc/mifaresniff.h b/armsrc/mifaresniff.h index db5af9a8..1065fa61 100644 --- a/armsrc/mifaresniff.h +++ b/armsrc/mifaresniff.h @@ -38,10 +38,10 @@ #define SNF_UID_4 0 #define SNF_UID_7 0 -int MfSniffInit(void); -int RAMFUNC MfSniffLogic(const uint8_t * data, int len, uint32_t parity, int bitCnt, int reader); -int RAMFUNC MfSniffSend(int maxTimeoutMs); -int intMfSniffSend(); -int MfSniffEnd(void); +bool MfSniffInit(void); +bool RAMFUNC MfSniffLogic(const uint8_t * data, uint16_t len, uint32_t parity, uint16_t bitCnt, bool reader); +bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs); +bool intMfSniffSend(); +bool MfSniffEnd(void); #endif \ No newline at end of file diff --git a/armsrc/util.c b/armsrc/util.c index dc18e5e3..6d34ae5e 100644 --- a/armsrc/util.c +++ b/armsrc/util.c @@ -316,9 +316,9 @@ uint32_t RAMFUNC GetDeltaCountUS(){ // ------------------------------------------------------------------------- -// Mifare timer. Uses ssp_clk from FPGA +// Timer for iso14443 commands. Uses ssp_clk from FPGA // ------------------------------------------------------------------------- -void StartCountMifare() +void StartCountSspClk() { AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0) | (1 << AT91C_ID_TC1) | (1 << AT91C_ID_TC2); // Enable Clock to all timers AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_TIOA1 // XC0 Clock = TIOA1 @@ -330,7 +330,7 @@ void StartCountMifare() AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK // TC1 Clock = MCK(48MHz)/2 = 24MHz | AT91C_TC_CPCSTOP // Stop clock on RC compare | AT91C_TC_EEVTEDG_RISING // Trigger on rising edge of Event - | AT91C_TC_EEVT_TIOB // Event-Source: TIOB1 (= ssc_clk from FPGA = 13,56MHz / 16) + | AT91C_TC_EEVT_TIOB // Event-Source: TIOB1 (= ssp_clk from FPGA = 13,56MHz/16) | AT91C_TC_ENETRG // Enable external trigger event | AT91C_TC_WAVESEL_UP // Upmode without automatic trigger on RC compare | AT91C_TC_WAVE // Waveform Mode @@ -339,7 +339,7 @@ void StartCountMifare() AT91C_BASE_TC1->TC_RC = 0x04; // RC Compare value = 0x04 // use TC0 to count TIOA1 pulses - AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // disable TC0 + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // disable TC0 AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_XC0 // TC0 clock = XC0 clock = TIOA1 | AT91C_TC_WAVE // Waveform Mode | AT91C_TC_WAVESEL_UP // just count @@ -354,29 +354,40 @@ void StartCountMifare() | AT91C_TC_WAVE // Waveform Mode | AT91C_TC_WAVESEL_UP; // just count - AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN; // enable TC0 AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN; // enable TC1 AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKEN; // enable TC2 - // activate the ISO14443 part of the FPGA. We need the clock and frame signals. - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); - - // synchronize the counter with the ssp_frame signal. + // + // synchronize the counter with the ssp_frame signal. Note: FPGA must be in any iso14446 mode, otherwise the frame signal would not be present + // + while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_FRAME)); // wait for ssp_frame to go high (start of frame) while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_FRAME); // wait for ssp_frame to be low - while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_FRAME)); // sync on rising edge of ssp_frame (= start of transfer) - + // after the falling edge of ssp_frame, there is delay of 1/13,56MHz (73ns) until the next rising edge of ssp_clk. This are only a few + // processor cycles. We therefore may or may not be able to sync on this edge. Therefore better make sure that we miss it: + while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)); // wait for ssp_clk to go high + // note: up to now two ssp_clk rising edges have passed since the rising edge of ssp_frame + // it is now safe to assert a sync signal. This sets all timers to 0 on next active clock edge AT91C_BASE_TCB->TCB_BCR = 1; // assert Sync (set all timers to 0 on next active clock edge) + // at the next (3rd) ssp_clk rising edge, TC1 will be reset (and not generate a clock signal to TC0) + // at the next (4th) ssp_clk rising edge, TC0 (the low word of our counter) will be reset. From now on, + // whenever the last three bits of our counter go 0, we can be sure to be in the middle of a frame transfer. + // (just started with the transfer of the 4th Bit). + // The high word of the counter (TC2) will not reset until the low word (TC0) overflows. Therefore need to wait quite some time before + // we can use the counter. + while (AT91C_BASE_TC0->TC_CV < 0xFFF0); } -uint32_t RAMFUNC GetCountMifare(){ +uint32_t RAMFUNC GetCountSspClk(){ uint32_t tmp_count; tmp_count = (AT91C_BASE_TC2->TC_CV << 16) | AT91C_BASE_TC0->TC_CV; - if ((tmp_count & 0xffff) == 0) { //small chance that we may have missed an increment in TC2 + if ((tmp_count & 0x0000ffff) == 0) { //small chance that we may have missed an increment in TC2 return (AT91C_BASE_TC2->TC_CV << 16); } else { return tmp_count; } } + + diff --git a/armsrc/util.h b/armsrc/util.h index 9c4b4c58..e8b9cdff 100644 --- a/armsrc/util.h +++ b/armsrc/util.h @@ -47,7 +47,7 @@ void StartCountUS(); uint32_t RAMFUNC GetCountUS(); uint32_t RAMFUNC GetDeltaCountUS(); -void StartCountMifare(); -uint32_t RAMFUNC GetCountMifare(); +void StartCountSspClk(); +uint32_t RAMFUNC GetCountSspClk(); #endif diff --git a/client/cmdhf14a.c b/client/cmdhf14a.c index 2c5fd1c0..d16d71ff 100644 --- a/client/cmdhf14a.c +++ b/client/cmdhf14a.c @@ -16,7 +16,6 @@ #include "util.h" #include "iso14443crc.h" #include "data.h" -//#include "proxusb.h" #include "proxmark3.h" #include "ui.h" #include "cmdparser.h" @@ -30,129 +29,150 @@ static void waitCmd(uint8_t iLen); int CmdHF14AList(const char *Cmd) { - uint8_t got[1920]; - GetFromBigBuf(got,sizeof(got),0); - WaitForResponse(CMD_ACK,NULL); - - PrintAndLog("recorded activity:"); - PrintAndLog(" ETU :rssi: who bytes"); - PrintAndLog("---------+----+----+-----------"); - - int i = 0; - int prev = -1; + bool ShowWaitCycles = false; + char param = param_getchar(Cmd, 0); + + if (param == 'h' || (param != 0 && param != 'f')) { + PrintAndLog("List data in trace buffer."); + PrintAndLog("Usage: hf 14a list [f]"); + PrintAndLog("f - show frame delay times as well"); + PrintAndLog("sample: hf 14a list f"); + return 0; + } - for (;;) { - if(i >= 1900) { - break; - } + if (param == 'f') { + ShowWaitCycles = true; + } + + uint8_t got[1920]; + GetFromBigBuf(got,sizeof(got),0); + WaitForResponse(CMD_ACK,NULL); + + PrintAndLog("Recorded Activity"); + PrintAndLog(""); + PrintAndLog("Start = Start of Start Bit, End = End of last modulation. Src = Source of Transfer"); + PrintAndLog("All times are in carrier periods (1/13.56Mhz)"); + PrintAndLog(""); + PrintAndLog(" Start | End | Src | Data"); + PrintAndLog("-----------|-----------|-----|--------"); + + int i = 0; + uint32_t first_timestamp = 0; + uint32_t timestamp; + uint32_t EndOfTransmissionTimestamp = 0; + + for (;;) { + if(i >= 1900) { + break; + } - bool isResponse; - int timestamp = *((uint32_t *)(got+i)); - if (timestamp & 0x80000000) { - timestamp &= 0x7fffffff; - isResponse = 1; - } else { - isResponse = 0; - } + bool isResponse; + timestamp = *((uint32_t *)(got+i)); + if (timestamp & 0x80000000) { + timestamp &= 0x7fffffff; + isResponse = true; + } else { + isResponse = false; + } - int metric = 0; - int parityBits = *((uint32_t *)(got+i+4)); - // 4 bytes of additional information... - // maximum of 32 additional parity bit information - // - // TODO: - // at each quarter bit period we can send power level (16 levels) - // or each half bit period in 256 levels. + if(i==0) { + first_timestamp = timestamp; + } + + int parityBits = *((uint32_t *)(got+i+4)); + int len = got[i+8]; - int len = got[i+8]; + if (len > 100) { + break; + } + if (i + len >= 1900) { + break; + } - if (len > 100) { - break; - } - if (i + len >= 1900) { - break; - } + uint8_t *frame = (got+i+9); - uint8_t *frame = (got+i+9); + // Break and stick with current result if buffer was not completely full + if (frame[0] == 0x44 && frame[1] == 0x44 && frame[2] == 0x44 && frame[3] == 0x44) break; - // Break and stick with current result if buffer was not completely full - if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; } + char line[1000] = ""; + int j; + if (len) { + for (j = 0; j < len; j++) { + int oddparity = 0x01; + int k; - char line[1000] = ""; - int j; - for (j = 0; j < len; j++) { - int oddparity = 0x01; - int k; + for (k=0;k<8;k++) { + oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01); + } - for (k=0;k<8;k++) { - oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01); - } + //if((parityBits >> (len - j - 1)) & 0x01) { + if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) { + sprintf(line+(j*4), "%02x! ", frame[j]); + } else { + sprintf(line+(j*4), "%02x ", frame[j]); + } + } + } else { + if (ShowWaitCycles) { + uint32_t next_timestamp = (*((uint32_t *)(got+i+9))) & 0x7fffffff; + sprintf(line, "fdt (Frame Delay Time): %d", (next_timestamp - timestamp)); + } + } - //if((parityBits >> (len - j - 1)) & 0x01) { - if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) { - sprintf(line+(j*4), "%02x! ", frame[j]); - } - else { - sprintf(line+(j*4), "%02x ", frame[j]); - } - } + char *crc; + crc = ""; + if (len > 2) { + uint8_t b1, b2; + for (j = 0; j < (len - 1); j++) { + // gives problems... search for the reason.. + /*if(frame[j] == 0xAA) { + switch(frame[j+1]) { + case 0x01: + crc = "[1] Two drops close after each other"; + break; + case 0x02: + crc = "[2] Potential SOC with a drop in second half of bitperiod"; + break; + case 0x03: + crc = "[3] Segment Z after segment X is not possible"; + break; + case 0x04: + crc = "[4] Parity bit of a fully received byte was wrong"; + break; + default: + crc = "[?] Unknown error"; + break; + } + break; + }*/ + } - char *crc; - crc = ""; - if (len > 2) { - uint8_t b1, b2; - for (j = 0; j < (len - 1); j++) { - // gives problems... search for the reason.. - /*if(frame[j] == 0xAA) { - switch(frame[j+1]) { - case 0x01: - crc = "[1] Two drops close after each other"; - break; - case 0x02: - crc = "[2] Potential SOC with a drop in second half of bitperiod"; - break; - case 0x03: - crc = "[3] Segment Z after segment X is not possible"; - break; - case 0x04: - crc = "[4] Parity bit of a fully received byte was wrong"; - break; - default: - crc = "[?] Unknown error"; - break; - } - break; - }*/ - } - - if (strlen(crc)==0) { - ComputeCrc14443(CRC_14443_A, frame, len-2, &b1, &b2); - if (b1 != frame[len-2] || b2 != frame[len-1]) { - crc = (isResponse & (len < 6)) ? "" : " !crc"; - } else { - crc = ""; + if (strlen(crc)==0) { + ComputeCrc14443(CRC_14443_A, frame, len-2, &b1, &b2); + if (b1 != frame[len-2] || b2 != frame[len-1]) { + crc = (isResponse & (len < 6)) ? "" : " !crc"; + } else { + crc = ""; + } + } + } else { + crc = ""; // SHORT } - } - } else { - crc = ""; // SHORT - } - char metricString[100]; - if (isResponse) { - sprintf(metricString, "%3d", metric); - } else { - strcpy(metricString, " "); - } + i += (len + 9); - PrintAndLog(" +%7d: %s: %s %s %s", - (prev < 0 ? 0 : (timestamp - prev)), - metricString, - (isResponse ? "TAG " : " "), line, crc); + EndOfTransmissionTimestamp = (*((uint32_t *)(got+i))) & 0x7fffffff; + + if (!ShowWaitCycles) i += 9; + + PrintAndLog(" %9d | %9d | %s | %s %s", + (timestamp - first_timestamp), + (EndOfTransmissionTimestamp - first_timestamp), + (len?(isResponse ? "Tag" : "Rdr"):" "), + line, crc); - prev = timestamp; - i += (len + 9); - } + } return 0; } @@ -167,7 +187,7 @@ int CmdHF14AReader(const char *Cmd) SendCommand(&c); UsbCommand resp; - WaitForResponse(CMD_ACK,&resp); + WaitForResponse(CMD_ACK,&resp); iso14a_card_select_t *card = (iso14a_card_select_t *)resp.d.asBytes; diff --git a/client/cmdhf14b.c b/client/cmdhf14b.c index 6696ac09..c42d54c5 100644 --- a/client/cmdhf14b.c +++ b/client/cmdhf14b.c @@ -182,6 +182,9 @@ int CmdHF14BList(const char *Cmd) uint8_t *frame = (got+i+9); + // Break and stick with current result if buffer was not completely full + if (frame[0] == 0x44 && frame[1] == 0x44 && frame[2] == 0x44 && frame[3] == 0x44) break; + char line[1000] = ""; int j; for(j = 0; j < len; j++) { diff --git a/client/cmdhfmf.c b/client/cmdhfmf.c index 637ef4a1..8d78b0e6 100644 --- a/client/cmdhfmf.c +++ b/client/cmdhfmf.c @@ -1144,7 +1144,7 @@ int CmdHF14AMfChk(const char *Cmd) int CmdHF14AMf1kSim(const char *Cmd) { - uint8_t uid[7] = {0, 0, 0, 0,0,0,0}; + uint8_t uid[7] = {0, 0, 0, 0, 0, 0, 0}; uint8_t exitAfterNReads = 0; uint8_t flags = 0; @@ -1196,7 +1196,7 @@ int CmdHF14AMf1kSim(const char *Cmd) memcpy(c.d.asBytes, uid, sizeof(uid)); SendCommand(&c); - if(flags & 1) + if(flags & FLAG_INTERACTIVE) { UsbCommand resp; PrintAndLog("Press pm3-button to abort simulation"); @@ -1879,7 +1879,7 @@ int CmdHF14AMfSniff(const char *Cmd){ PrintAndLog("received trace len: %d packages: %d", blockLen, pckNum); num = 0; while (bufPtr - buf + 9 < blockLen) { - isTag = bufPtr[3] & 0x80 ? true:false; + isTag = bufPtr[3] & 0x80 ? true:false; bufPtr += 4; parity = *((uint32_t *)(bufPtr)); bufPtr += 4; @@ -1923,7 +1923,7 @@ static command_t CommandTable[] = {"restore", CmdHF14AMfRestore, 0, "Restore MIFARE classic binary file to BLANK tag"}, {"wrbl", CmdHF14AMfWrBl, 0, "Write MIFARE classic block"}, {"chk", CmdHF14AMfChk, 0, "Test block keys"}, - {"mifare", CmdHF14AMifare, 0, "Read parity error messages. param - "}, + {"mifare", CmdHF14AMifare, 0, "Read parity error messages."}, {"nested", CmdHF14AMfNested, 0, "Test nested authentication"}, {"sniff", CmdHF14AMfSniff, 0, "Sniff card-reader communication"}, {"sim", CmdHF14AMf1kSim, 0, "Simulate MIFARE card"}, diff --git a/fpga/fpga.bit b/fpga/fpga.bit index e7d62707..97cdd233 100644 Binary files a/fpga/fpga.bit and b/fpga/fpga.bit differ diff --git a/fpga/hi_iso14443a.v b/fpga/hi_iso14443a.v index 1009c436..0f7325b6 100644 --- a/fpga/hi_iso14443a.v +++ b/fpga/hi_iso14443a.v @@ -3,6 +3,13 @@ // Gerhard de Koning Gans, April 2008 //----------------------------------------------------------------------------- +// constants for the different modes: +`define SNIFFER 3'b000 +`define TAGSIM_LISTEN 3'b001 +`define TAGSIM_MOD 3'b010 +`define READER_LISTEN 3'b011 +`define READER_MOD 3'b100 + module hi_iso14443a( pck0, ck_1356meg, ck_1356megb, pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4, @@ -25,26 +32,23 @@ module hi_iso14443a( reg ssp_clk; reg ssp_frame; -reg fc_div_2; -always @(posedge ck_1356meg) - fc_div_2 = ~fc_div_2; - wire adc_clk; assign adc_clk = ck_1356meg; -reg after_hysteresis, after_hysteresis_prev1, after_hysteresis_prev2, after_hysteresis_prev3; +reg after_hysteresis, after_hysteresis_prev1, after_hysteresis_prev2, after_hysteresis_prev3, after_hysteresis_prev4; reg [11:0] has_been_low_for; reg [8:0] saw_deep_modulation; reg [2:0] deep_counter; reg deep_modulation; + always @(negedge adc_clk) begin - if(& adc_d[7:6]) after_hysteresis <= 1'b1; // if adc_d >= 196 - else if(~(| adc_d[7:4])) after_hysteresis <= 1'b0; // if adc_d <= 15 + if(& adc_d[7:6]) after_hysteresis <= 1'b1; // adc_d >= 196 (U >= 3,28V) -> after_hysteris = 1 + else if(~(| adc_d[7:4])) after_hysteresis <= 1'b0; // if adc_d <= 15 (U <= 1,13V) -> after_hysteresis = 0 - if(~(| adc_d[7:0])) + if(~(| adc_d[7:0])) // if adc_d == 0 (U <= 0,94V) begin - if(deep_counter == 3'd7) + if(deep_counter == 3'd7) // adc_d == 0 for 7 adc_clk ticks -> deep_modulation (by reader) begin deep_modulation <= 1'b1; saw_deep_modulation <= 8'd0; @@ -52,10 +56,10 @@ begin else deep_counter <= deep_counter + 1; end - else + else begin deep_counter <= 3'd0; - if(saw_deep_modulation == 8'd255) + if(saw_deep_modulation == 8'd255) // adc_d != 0 for 255 adc_clk ticks -> deep_modulation is over, now waiting for tag's response deep_modulation <= 1'b0; else saw_deep_modulation <= saw_deep_modulation + 1; @@ -63,37 +67,31 @@ begin if(after_hysteresis) begin - has_been_low_for <= 7'b0; + has_been_low_for <= 12'd0; end else begin if(has_been_low_for == 12'd4095) begin has_been_low_for <= 12'd0; - after_hysteresis <= 1'b1; + after_hysteresis <= 1'b1; // reset after_hysteresis to 1 if it had been 0 for 4096 cycles (no field) end else + begin has_been_low_for <= has_been_low_for + 1; + end end end + + // Report every 4 subcarrier cycles -// 64 periods of carrier frequency => 6-bit counter [negedge_cnt] -reg [5:0] negedge_cnt; -reg bit1, bit2, bit3; -reg [3:0] count_ones; -reg [3:0] count_zeros; -// wire [7:0] avg; -// reg [7:0] lavg; -// reg signed [12:0] step1; -// reg signed [12:0] step2; -// reg [7:0] stepsize; -reg [7:0] rx_mod_edge_threshold; +// 128 periods of carrier frequency => 7-bit counter [negedge_cnt] +reg [6:0] negedge_cnt; +reg bit1, bit2, bit3, bit4; reg curbit; -// reg [12:0] average; -// wire signed [9:0] dif; -// storage for two previous samples: +// storage for four previous samples: reg [7:0] adc_d_1; reg [7:0] adc_d_2; reg [7:0] adc_d_3; @@ -108,201 +106,244 @@ assign adc_d_filtered = (adc_d_4 << 1) + adc_d_3 - adc_d_1 - (adc_d << 1); reg [7:0] rx_mod_falling_edge_max; reg [7:0] rx_mod_rising_edge_max; -// A register to send the results to the arm -reg signed [7:0] to_arm; +// A register to send 8 Bit results to the arm +reg [7:0] to_arm; reg bit_to_arm; reg fdt_indicator, fdt_elapsed; reg [10:0] fdt_counter; -reg [47:0] mod_sig_buf; -wire mod_sig_buf_empty; -reg [5:0] mod_sig_ptr; +//reg [47:0] mod_sig_buf; +reg [31:0] mod_sig_buf; +//reg [5:0] mod_sig_ptr; +reg [4:0] mod_sig_ptr; reg [3:0] mod_sig_flip; reg mod_sig, mod_sig_coil; reg temp_buffer_reset; reg sendbit; - -assign mod_sig_buf_empty = ~(|mod_sig_buf[47:0]); -reg [2:0] ssp_frame_counter; +reg [3:0] sub_carrier_cnt; // ADC data appears on the rising edge, so sample it on the falling edge always @(negedge adc_clk) begin // ------------------------------------------------------------------------------------------------------------------------------------------------------------------ - // relevant for TAGSIM_MOD only. Timing of Tag's answer to a command received from a reader + // relevant for TAGSIM_MOD only. Timing of Tag's answer relative to a command received from a reader // ISO14443-3 specifies: // fdt = 1172, if last bit was 0. // fdt = 1236, if last bit was 1. // the FPGA takes care for the 1172 delay. To achieve the additional 1236-1172=64 ticks delay, the ARM must send an additional correction bit (before the start bit). // The correction bit will be coded as 00010000, i.e. it adds 4 bits to the transmission stream, causing the required delay. - if(fdt_counter == 11'd740) fdt_indicator = 1'b1; // fdt_indicator is true for 740 <= fdt_counter <= 1148. Ready to buffer data. (?) - // Shouldn' this be 1236 - 720 = 516? (The mod_sig_buf can buffer 46 data bits, - // i.e. a maximum delay of 46 * 16 = 720 adc_clk ticks) + if(fdt_counter == 11'd547) fdt_indicator <= 1'b1; // The ARM must not send earlier to prevent mod_sig_buf overflow. + // The mod_sig_buf can buffer 29 excess data bits, i.e. a maximum delay of 29 * 16 = 464 adc_clk ticks. fdt_indicator + // could appear at ssp_din after 1 tick, 16 ticks for the transfer, 128 ticks until response is sended. + // 1148 - 464 - 1 - 128 - 8 = 547 - if(fdt_counter == 11'd1148) // additional 16 (+ eventual n*128) adc_clk_ticks delay will be added by the mod_sig_buf below - // the remaining 8 ticks delay comes from the 8 ticks timing difference between reseting fdt_counter and the mod_sig_buf clock. + if ((mod_type == `TAGSIM_MOD) || (mod_type == `TAGSIM_LISTEN)) begin - if(fdt_elapsed) + if(fdt_counter == 11'd1148) // the RF part delays the rising edge by approx 5 adc_clk_ticks, the ADC needs 3 clk_ticks for A/D conversion, + // 16 ticks delay by mod_sig_buf + // 1172 - 5 - 3 - 16 = 1148. begin - if(negedge_cnt[3:0] == mod_sig_flip[3:0]) mod_sig_coil <= mod_sig; // start modulating (if mod_sig is already set) + if(fdt_elapsed) + begin + if(negedge_cnt[3:0] == mod_sig_flip) mod_sig_coil <= mod_sig; // start modulating (if mod_sig is already set) + sub_carrier_cnt[3:0] <= sub_carrier_cnt[3:0] + 1; + end + else + begin + mod_sig_flip <= negedge_cnt[3:0]; // start modulation at this time + sub_carrier_cnt[3:0] <= 0; // subcarrier phase in sync with start of modulation + mod_sig_coil <= mod_sig; // assign signal to coil + fdt_elapsed = 1'b1; + if(~(| mod_sig_ptr[4:0])) mod_sig_ptr <= 5'd9; // if mod_sig_ptr == 0 -> didn't receive a 1 yet. Delay next 1 by n*128 ticks. + else temp_buffer_reset = 1'b1; // else fix the buffer size at current position + end end else begin - mod_sig_flip[3:0] <= negedge_cnt[3:0]; // exact timing of modulation - mod_sig_coil <= mod_sig; // modulate (if mod_sig is already set) - fdt_elapsed = 1'b1; - fdt_indicator = 1'b0; - - if(~(| mod_sig_ptr[5:0])) mod_sig_ptr <= 6'b001001; // didn't receive a 1 yet. Delay next 1 by n*128 ticks. - else temp_buffer_reset = 1'b1; // else fix the buffer size at current position + fdt_counter <= fdt_counter + 1; // Count until 1155 end end - else + else // other modes: don't use the delay line. begin - fdt_counter <= fdt_counter + 1; // Count until 1148 - end + mod_sig_coil <= ssp_dout; + end //------------------------------------------------------------------------------------------------------------------------------------------- // Relevant for READER_LISTEN only // look for steepest falling and rising edges: - if (adc_d_filtered > 0) + + if(negedge_cnt[3:0] == 4'd1) // reset modulation detector. Save current edge. + begin + if (adc_d_filtered > 0) begin - if (adc_d_filtered > rx_mod_falling_edge_max) rx_mod_falling_edge_max <= adc_d_filtered; - end - else + rx_mod_rising_edge_max <= 0; + end + else begin - if (-adc_d_filtered > rx_mod_rising_edge_max) + rx_mod_falling_edge_max <= 0; rx_mod_rising_edge_max <= -adc_d_filtered; end - + end + else // detect modulation + begin + if (adc_d_filtered > 0) + begin + if (adc_d_filtered > rx_mod_falling_edge_max) + rx_mod_falling_edge_max <= adc_d_filtered; + end + else + begin + if (-adc_d_filtered > rx_mod_rising_edge_max) + rx_mod_rising_edge_max <= -adc_d_filtered; + end + end + + // detect modulation signal: if modulating, there must be a falling and a rising edge + if (rx_mod_falling_edge_max > 6 && rx_mod_rising_edge_max > 6) + curbit <= 1'b1; // modulation + else + curbit <= 1'b0; // no modulation + + // store previous samples for filtering and edge detection: adc_d_4 <= adc_d_3; adc_d_3 <= adc_d_2; adc_d_2 <= adc_d_1; adc_d_1 <= adc_d; - - if(& negedge_cnt[3:0]) // == 0xf == 15 + // Relevant for TAGSIM_MOD only (timing the Tag's answer. See above) + // When we see end of a modulation and we are emulating a Tag, start fdt_counter. + // Reset fdt_counter when modulation is detected. + if(~after_hysteresis /* && mod_sig_buf_empty */ && mod_type == `TAGSIM_LISTEN) begin - // Relevant for TAGSIM_MOD only (timing Tag's answer. See above) - // When there is a dip in the signal and not in (READER_MOD, READER_LISTEN, TAGSIM_MOD) - if(~after_hysteresis && mod_sig_buf_empty && ~((mod_type == 3'b100) || (mod_type == 3'b011) || (mod_type == 3'b010))) // last condition to prevent reset + fdt_counter <= 11'd0; + fdt_elapsed = 1'b0; + fdt_indicator <= 1'b0; + temp_buffer_reset = 1'b0; + mod_sig_ptr <= 5'b00000; + mod_sig = 1'b0; + end + + + if(negedge_cnt[3:0] == 4'd1) + begin + // What do we communicate to the ARM + if(mod_type == `TAGSIM_LISTEN) + sendbit = after_hysteresis; + else if(mod_type == `TAGSIM_MOD) + /* if(fdt_counter > 11'd772) sendbit = mod_sig_coil; // huh? + else */ + sendbit = fdt_indicator; + else if (mod_type == `READER_LISTEN) + sendbit = curbit; + else + sendbit = 1'b0; + end + + //------------------------------------------------------------------------------------------------------------------------------------------ + // Prepare 8 Bits to communicate to ARM + + // in SNIFFER mode: 4 Bits data sniffed as Tag, 4 Bits data sniffed as Reader + if(mod_type == `SNIFFER) + begin + if (negedge_cnt == 7'd63) begin - fdt_counter <= 11'd0; - fdt_elapsed = 1'b0; - fdt_indicator = 1'b0; - temp_buffer_reset = 1'b0; - mod_sig_ptr <= 6'b000000; - end - - // Relevant for READER_LISTEN only - // detect modulation signal: if modulating, there must be a falling and a rising edge ... and vice versa - if (rx_mod_falling_edge_max > 6 && rx_mod_rising_edge_max > 6) - curbit = 1'b1; // modulation + if(deep_modulation) // a reader is sending (or there's no field at all) + begin + to_arm <= {after_hysteresis_prev1,after_hysteresis_prev2,after_hysteresis_prev3,after_hysteresis_prev4,1'b0,1'b0,1'b0,1'b0}; + end else - curbit = 1'b0; // no modulation - - // prepare next edge detection: - rx_mod_rising_edge_max <= 0; - rx_mod_falling_edge_max <= 0; - - - // What do we communicate to the ARM - if(mod_type == 3'b001) sendbit = after_hysteresis; // TAGSIM_LISTEN - else if(mod_type == 3'b010) // TAGSIM_MOD + begin + to_arm <= {after_hysteresis_prev1,after_hysteresis_prev2,after_hysteresis_prev3,after_hysteresis_prev4,bit1,bit2,bit3,bit4}; + end + negedge_cnt <= 0; + end + else begin - if(fdt_counter > 11'd772) sendbit = mod_sig_coil; - else sendbit = fdt_indicator; + negedge_cnt <= negedge_cnt + 1; end - else if(mod_type == 3'b011) sendbit = curbit; // READER_LISTEN - else sendbit = 1'b0; // READER_MOD, SNIFFER - end - - //------------------------------------------------------------------------------------------------------------------------------------------ - // Relevant for SNIFFER mode only. Prepare communication to ARM. - if(negedge_cnt == 7'd63) - begin - if(deep_modulation) + else + // other modes: 8 Bits info on queue delay + begin + if(negedge_cnt == 7'd127) begin - to_arm <= {after_hysteresis_prev1,after_hysteresis_prev2,after_hysteresis_prev3,after_hysteresis,1'b0,1'b0,1'b0,1'b0}; + if (mod_type == `TAGSIM_MOD) + begin + to_arm[7:0] <= {mod_sig_ptr[4:0], mod_sig_flip[3:1]}; + end + else + begin + to_arm[7:0] <= 8'd0; + end + negedge_cnt <= 0; end else begin - to_arm <= {after_hysteresis_prev1,after_hysteresis_prev2,after_hysteresis_prev3,after_hysteresis,bit1,bit2,bit3,curbit}; + negedge_cnt <= negedge_cnt + 1; end - - negedge_cnt <= 0; - end - else - begin - negedge_cnt <= negedge_cnt + 1; - end - - if(negedge_cnt == 6'd15) + + if(negedge_cnt == 7'd1) begin after_hysteresis_prev1 <= after_hysteresis; bit1 <= curbit; end - if(negedge_cnt == 6'd31) + if(negedge_cnt == 7'd17) begin after_hysteresis_prev2 <= after_hysteresis; bit2 <= curbit; end - if(negedge_cnt == 6'd47) + if(negedge_cnt == 7'd33) begin after_hysteresis_prev3 <= after_hysteresis; bit3 <= curbit; end + if(negedge_cnt == 7'd47) + begin + after_hysteresis_prev4 <= after_hysteresis; + bit4 <= curbit; + end //-------------------------------------------------------------------------------------------------------------------------------------------------------------- // Relevant in TAGSIM_MOD only. Delay-Line to buffer data and send it at the correct time - // Note: Data in READER_MOD is fed through this delay line as well. - if(mod_type != 3'b000) // != SNIFFER + if(negedge_cnt[3:0] == 4'd0) // at rising edge of ssp_clk - ssp_dout changes at the falling edge. begin - if(negedge_cnt[3:0] == 4'b1000) // == 0x8 + mod_sig_buf[31:0] <= {mod_sig_buf[30:1], ssp_dout, 1'b0}; // shift in new data starting at mod_sig_buf[1]. mod_sig_buf[0] = 0 always. + // asign the delayed signal to mod_sig, but don't modulate with the correction bit (which is sent as 00010000, all other bits will come with at least 2 consecutive 1s) + // side effect: when ptr = 1 it will cancel the first 1 of every block of ones. Note: this would only be the case if we received a 1 just before fdt_elapsed. + if((ssp_dout || (| mod_sig_ptr[4:0])) && ~fdt_elapsed) // buffer a 1 (and all subsequent data) until fdt_counter = 1148 adc_clk ticks. + //if(mod_sig_ptr == 6'b101110) // buffer overflow at 46 - this would mean data loss + //begin + // mod_sig_ptr <= 6'b000000; + //end + if (mod_sig_ptr == 5'd30) mod_sig_ptr <= 5'd0; + else mod_sig_ptr <= mod_sig_ptr + 1; // increase buffer (= increase delay by 16 adc_clk ticks). ptr always points to first 1. + else if(fdt_elapsed && ~temp_buffer_reset) + // fdt_elapsed. If we didn't receive a 1 yet, ptr will be at 9 and not yet fixed. Otherwise temp_buffer_reset will be 1 already. begin - // The modulation signal of the tag. The delay line is only relevant for TAGSIM_MOD, but used in other modes as well. - // Note: this means that even in READER_MOD, there will be an arbitrary delay depending on the time of a previous reset of fdt_counter and the time and - // content of the next bit to be transmitted. - mod_sig_buf[47:0] <= {mod_sig_buf[46:1], ssp_dout, 1'b0}; // shift in new data starting at mod_sig_buf[1]. mod_sig_buf[0] = 0 always. - if((ssp_dout || (| mod_sig_ptr[5:0])) && ~fdt_elapsed) // buffer a 1 (and all subsequent data) until fdt_counter = 1148 adc_clk ticks. - if(mod_sig_ptr == 6'b101110) // buffer overflow at 46 - this would mean data loss - begin - mod_sig_ptr <= 6'b000000; - end - else mod_sig_ptr <= mod_sig_ptr + 1; // increase buffer (= increase delay by 16 adc_clk ticks). ptr always points to first 1. - else if(fdt_elapsed && ~temp_buffer_reset) - // fdt_elapsed. If we didn't receive a 1 yet, ptr will be at 9 and not yet fixed. Otherwise temp_buffer_reset will be 1 already. - begin - // wait for the next 1 after fdt_elapsed before fixing the delay and starting modulation. This ensures that the response can only happen - // at intervals of 8 * 16 = 128 adc_clk ticks intervals (as defined in ISO14443-3) - if(ssp_dout) temp_buffer_reset = 1'b1; - if(mod_sig_ptr == 6'b000010) mod_sig_ptr <= 6'b001001; // still nothing received, need to go for the next interval - else mod_sig_ptr <= mod_sig_ptr - 1; // decrease buffer. - end - else - // mod_sig_ptr and therefore the delay is now fixed until fdt_counter is reset (this can happen in SNIFFER and TAGSIM_LISTEN mode only. Note that SNIFFER - // mode (3'b000) is the default and is active in FPGA_MAJOR_MODE_OFF if no other minor mode is explicitly requested. - begin - // don't modulate with the correction bit (which is sent as 00010000, all other bits will come with at least 2 consecutive 1s) - // side effect: when ptr = 1 it will cancel the first 1 of every block of ones. Note: this would only be the case if we received a 1 just before fdt_elapsed. - if(~mod_sig_buf[mod_sig_ptr-1] && ~mod_sig_buf[mod_sig_ptr+1]) mod_sig = 1'b0; - // finally, do the modulation: - else mod_sig = mod_sig_buf[mod_sig_ptr] & fdt_elapsed; - end + // wait for the next 1 after fdt_elapsed before fixing the delay and starting modulation. This ensures that the response can only happen + // at intervals of 8 * 16 = 128 adc_clk ticks intervals (as defined in ISO14443-3) + if(ssp_dout) temp_buffer_reset = 1'b1; + if(mod_sig_ptr == 5'd2) mod_sig_ptr <= 5'd9; // still nothing received, need to go for the next interval + else mod_sig_ptr <= mod_sig_ptr - 1; // decrease buffer. + end + else + begin + if(~mod_sig_buf[mod_sig_ptr-1] && ~mod_sig_buf[mod_sig_ptr+1]) mod_sig = 1'b0; + // finally, assign the delayed signal: + else mod_sig = mod_sig_buf[mod_sig_ptr]; end end //----------------------------------------------------------------------------------------------------------------------------------------------------------------------- // Communication to ARM (SSP Clock and data) // SNIFFER mode (ssp_clk = adc_clk / 8, ssp_frame clock = adc_clk / 64)): - if(mod_type == 3'b000) + if(mod_type == `SNIFFER) begin if(negedge_cnt[2:0] == 3'b100) ssp_clk <= 1'b0; @@ -311,7 +352,7 @@ begin begin ssp_clk <= 1'b1; // Don't shift if we just loaded new data, obviously. - if(negedge_cnt != 7'd0) + if(negedge_cnt[5:0] != 6'd0) begin to_arm[7:1] <= to_arm[6:0]; end @@ -333,41 +374,52 @@ begin if(negedge_cnt[3:0] == 4'b0111) begin - if(ssp_frame_counter == 3'd7) ssp_frame_counter <= 3'd0; - else ssp_frame_counter <= ssp_frame_counter + 1; + // if(ssp_frame_counter == 3'd7) ssp_frame_counter <= 3'd0; + // else ssp_frame_counter <= ssp_frame_counter + 1; + if (negedge_cnt[6:4] == 3'b000) ssp_frame = 1'b1; + else ssp_frame = 1'b0; end + // ssp_frame = (ssp_frame_counter == 3'd7); if(negedge_cnt[3:0] == 4'b0000) begin ssp_clk <= 1'b1; + // Don't shift if we just loaded new data, obviously. + if(negedge_cnt[6:0] != 7'd0) + begin + to_arm[7:1] <= to_arm[6:0]; + end end - ssp_frame = (ssp_frame_counter == 3'd7); - - bit_to_arm = sendbit; - end + if (mod_type == `TAGSIM_MOD && fdt_elapsed && temp_buffer_reset) + // transmit timing information + bit_to_arm = to_arm[7]; + else + // transmit data or fdt_indicator + bit_to_arm = sendbit; + end -end +end //always @(negedge adc_clk) assign ssp_din = bit_to_arm; -// Modulating carrier (adc_clk/16, for TAGSIM_MOD only). Will be 0 for other modes. -wire modulating_carrier; -assign modulating_carrier = (mod_sig_coil & negedge_cnt[3] & (mod_type == 3'b010)); // in TAGSIM_MOD only. Otherwise always 0. +// Subcarrier (adc_clk/16, for TAGSIM_MOD only). +wire sub_carrier; +assign sub_carrier = ~sub_carrier_cnt[3]; -// for READER_MOD only: drop carrier for mod_sig_coil==1 (pause), READER_LISTEN: carrier always on, others: carrier always off -assign pwr_hi = (ck_1356megb & (((mod_type == 3'b100) & ~mod_sig_coil) || (mod_type == 3'b011))); +// in READER_MOD: drop carrier for mod_sig_coil==1 (pause); in READER_LISTEN: carrier always on; in other modes: carrier always off +assign pwr_hi = (ck_1356megb & (((mod_type == `READER_MOD) & ~mod_sig_coil) || (mod_type == `READER_LISTEN))); // Enable HF antenna drivers: assign pwr_oe1 = 1'b0; assign pwr_oe3 = 1'b0; -// TAGSIM_MOD: short circuit antenna with different resistances (modulated by modulating_carrier) +// TAGSIM_MOD: short circuit antenna with different resistances (modulated by sub_carrier modulated by mod_sig_coil) // for pwr_oe4 = 1 (tristate): antenna load = 10k || 33 = 32,9 Ohms // for pwr_oe4 = 0 (active): antenna load = 10k || 33 || 33 = 16,5 Ohms -assign pwr_oe4 = modulating_carrier; +assign pwr_oe4 = ~(mod_sig_coil & sub_carrier & (mod_type == `TAGSIM_MOD)); // This is all LF, so doesn't matter. assign pwr_oe2 = 1'b0;