From: pwpiwi Date: Sat, 12 Jan 2019 12:28:26 +0000 (+0100) Subject: Fix 15 snoop (#752) X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/d9de20fa4bb0a36052927b55c4185caa204c5c4d Fix 15 snoop (#752) * fixing hf 15: implement hf 15 snoop * rename hf 15 record to hf 15 snoop * speedup sampling / decoding: * new FPGA mode FPGA_HF_READER_RX_XCORR_AMPLITUDE implements amplitude(ci, cq) on FPGA * inlining the decoders in iso15693.c * inlining memcpy/memset in LogTrace() * giving up the moving correlator for SOF in Handle15693SamplesFromTag * decode more of EOF in Handle15693SamplesFromTag() * some refactoring --- diff --git a/CHANGELOG.md b/CHANGELOG.md index 19db5195..f2c285b4 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -12,7 +12,8 @@ This project uses the changelog in accordance with [keepchangelog](http://keepac ### Fixed - AC-Mode decoding for HitagS -- Wrong UID at HitagS simulation +- Wrong UID at HitagS simulation +- 'hf 15 sim' now works as expected (piwi) ### Added - Support Standard Communication Mode in HITAG S @@ -24,6 +25,7 @@ This project uses the changelog in accordance with [keepchangelog](http://keepac - Added `hf fido` `assert` and `make` commands from fido2 protocol (authenticatorMakeCredential and authenticatorGetAssertion) (Merlok) - Added `lf paradox clone` to clone a Paradox card - Added `emv` commmands working for both contactless and smart cards (Merlok) +- Added 'hf 15 snoop' (piwi) ## [v3.1.0][2018-10-10] diff --git a/armsrc/BigBuf.c b/armsrc/BigBuf.c index 4b1264b6..e2f51311 100644 --- a/armsrc/BigBuf.c +++ b/armsrc/BigBuf.c @@ -36,8 +36,8 @@ static uint16_t BigBuf_hi = BIGBUF_SIZE; static uint8_t *emulator_memory = NULL; // trace related variables -static uint16_t traceLen = 0; -int tracing = 1; //Last global one.. todo static? +static uint32_t traceLen = 0; +static bool tracing = true; // get the address of BigBuf uint8_t *BigBuf_get_addr(void) @@ -66,7 +66,7 @@ void BigBuf_Clear(void) // clear ALL of BigBuf void BigBuf_Clear_ext(bool verbose) { - memset(BigBuf,0,BIGBUF_SIZE); + memset(BigBuf, 0, BIGBUF_SIZE); if (verbose) Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE); } @@ -76,7 +76,7 @@ void BigBuf_Clear_EM(void){ void BigBuf_Clear_keep_EM(void) { - memset(BigBuf,0,BigBuf_hi); + memset(BigBuf, 0, BigBuf_hi); } // allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory @@ -162,8 +162,8 @@ bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_ uint8_t *trace = BigBuf_get_addr(); - uint16_t num_paritybytes = (iLen-1)/8 + 1; // number of valid paritybytes in *parity - uint16_t duration = timestamp_end - timestamp_start; + uint32_t num_paritybytes = (iLen-1)/8 + 1; // number of valid paritybytes in *parity + uint32_t duration = timestamp_end - timestamp_start; // Return when trace is full uint16_t max_traceLen = BigBuf_max_traceLen(); @@ -200,19 +200,23 @@ bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_ // data bytes if (btBytes != NULL && iLen != 0) { - memcpy(trace + traceLen, btBytes, iLen); + for (int i = 0; i < iLen; i++) { + trace[traceLen++] = *btBytes++; + } } - traceLen += iLen; // parity bytes if (num_paritybytes != 0) { if (parity != NULL) { - memcpy(trace + traceLen, parity, num_paritybytes); + for (int i = 0; i < num_paritybytes; i++) { + trace[traceLen++] = *parity++; + } } else { - memset(trace + traceLen, 0x00, num_paritybytes); + for (int i = 0; i < num_paritybytes; i++) { + trace[traceLen++] = 0x00; + } } } - traceLen += num_paritybytes; return true; } @@ -259,8 +263,9 @@ int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwP trace[traceLen++] = ((dwParity >> 24) & 0xff); trace[traceLen++] = iBits; - memcpy(trace + traceLen, btBytes, iLen); - traceLen += iLen; + for (int i = 0; i < iLen; i++) { + trace[traceLen++] = *btBytes++; + } return true; } diff --git a/armsrc/appmain.c b/armsrc/appmain.c index 58c979db..1348ef04 100644 --- a/armsrc/appmain.c +++ b/armsrc/appmain.c @@ -24,6 +24,7 @@ #include "legicrfsim.h" #include "hitag2.h" #include "hitagS.h" +#include "iso15693.h" #include "lfsampling.h" #include "BigBuf.h" #include "mifareutil.h" @@ -1115,8 +1116,9 @@ void UsbPacketReceived(uint8_t *packet, int len) case CMD_ACQUIRE_RAW_ADC_SAMPLES_ISO_15693: AcquireRawAdcSamplesIso15693(); break; - case CMD_RECORD_RAW_ADC_SAMPLES_ISO_15693: - RecordRawAdcSamplesIso15693(); + + case CMD_SNOOP_ISO_15693: + SnoopIso15693(); break; case CMD_ISO_15693_COMMAND: diff --git a/armsrc/apps.h b/armsrc/apps.h index b9b1f3de..fad9e6eb 100644 --- a/armsrc/apps.h +++ b/armsrc/apps.h @@ -25,7 +25,6 @@ extern const uint8_t OddByteParity[256]; extern int rsamples; // = 0; -extern int tracing; // = TRUE; extern uint8_t trigger; // This may be used (sparingly) to declare a function to be copied to @@ -101,7 +100,6 @@ void RAMFUNC SnoopIso14443b(void); void SendRawCommand14443B(uint32_t, uint32_t, uint8_t, uint8_t[]); // Also used in iclass.c -bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t len, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag); void GetParity(const uint8_t *pbtCmd, uint16_t len, uint8_t *parity); void RAMFUNC SniffMifare(uint8_t param); @@ -150,15 +148,6 @@ void OnSuccess(); void OnError(uint8_t reason); -/// iso15693.h -void RecordRawAdcSamplesIso15693(void); -void AcquireRawAdcSamplesIso15693(void); -void ReaderIso15693(uint32_t parameter); // Simulate an ISO15693 reader - greg -void SimTagIso15693(uint32_t parameter, uint8_t *uid); // simulate an ISO15693 tag - greg -void BruteforceIso15693Afi(uint32_t speed); // find an AFI of a tag - atrox -void DirectTag15693Command(uint32_t datalen,uint32_t speed, uint32_t recv, uint8_t data[]); // send arbitrary commands from CLI - atrox -void SetDebugIso15693(uint32_t flag); - /// iclass.h void RAMFUNC SnoopIClass(void); void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain); diff --git a/armsrc/fpgaloader.h b/armsrc/fpgaloader.h index 5aff6505..0600067e 100644 --- a/armsrc/fpgaloader.h +++ b/armsrc/fpgaloader.h @@ -24,7 +24,7 @@ void SetupSpi(int mode); bool FpgaSetupSscDma(uint8_t *buf, uint16_t sample_count); void Fpga_print_status(); int FpgaGetCurrent(); -#define FpgaDisableSscDma(void) AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; +#define FpgaDisableSscDma(void) AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; #define FpgaEnableSscDma(void) AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTEN; void SetAdcMuxFor(uint32_t whichGpio); @@ -33,46 +33,47 @@ void SetAdcMuxFor(uint32_t whichGpio); #define FPGA_BITSTREAM_HF 2 // Definitions for the FPGA commands. -#define FPGA_CMD_SET_CONFREG (1<<12) -#define FPGA_CMD_SET_DIVISOR (2<<12) -#define FPGA_CMD_SET_USER_BYTE1 (3<<12) +#define FPGA_CMD_SET_CONFREG (1<<12) +#define FPGA_CMD_SET_DIVISOR (2<<12) +#define FPGA_CMD_SET_USER_BYTE1 (3<<12) // Definitions for the FPGA configuration word. // LF -#define FPGA_MAJOR_MODE_LF_ADC (0<<5) -#define FPGA_MAJOR_MODE_LF_EDGE_DETECT (1<<5) -#define FPGA_MAJOR_MODE_LF_PASSTHRU (2<<5) +#define FPGA_MAJOR_MODE_LF_ADC (0<<5) +#define FPGA_MAJOR_MODE_LF_EDGE_DETECT (1<<5) +#define FPGA_MAJOR_MODE_LF_PASSTHRU (2<<5) // HF -#define FPGA_MAJOR_MODE_HF_READER_TX (0<<5) -#define FPGA_MAJOR_MODE_HF_READER_RX_XCORR (1<<5) -#define FPGA_MAJOR_MODE_HF_SIMULATOR (2<<5) -#define FPGA_MAJOR_MODE_HF_ISO14443A (3<<5) -#define FPGA_MAJOR_MODE_HF_SNOOP (4<<5) +#define FPGA_MAJOR_MODE_HF_READER_TX (0<<5) +#define FPGA_MAJOR_MODE_HF_READER_RX_XCORR (1<<5) +#define FPGA_MAJOR_MODE_HF_SIMULATOR (2<<5) +#define FPGA_MAJOR_MODE_HF_ISO14443A (3<<5) +#define FPGA_MAJOR_MODE_HF_SNOOP (4<<5) // BOTH -#define FPGA_MAJOR_MODE_OFF (7<<5) +#define FPGA_MAJOR_MODE_OFF (7<<5) // Options for LF_ADC -#define FPGA_LF_ADC_READER_FIELD (1<<0) +#define FPGA_LF_ADC_READER_FIELD (1<<0) // Options for LF_EDGE_DETECT -#define FPGA_CMD_SET_EDGE_DETECT_THRESHOLD FPGA_CMD_SET_USER_BYTE1 -#define FPGA_LF_EDGE_DETECT_READER_FIELD (1<<0) -#define FPGA_LF_EDGE_DETECT_TOGGLE_MODE (1<<1) +#define FPGA_CMD_SET_EDGE_DETECT_THRESHOLD FPGA_CMD_SET_USER_BYTE1 +#define FPGA_LF_EDGE_DETECT_READER_FIELD (1<<0) +#define FPGA_LF_EDGE_DETECT_TOGGLE_MODE (1<<1) // Options for the HF reader, tx to tag -#define FPGA_HF_READER_TX_SHALLOW_MOD (1<<0) +#define FPGA_HF_READER_TX_SHALLOW_MOD (1<<0) // Options for the HF reader, correlating against rx from tag -#define FPGA_HF_READER_RX_XCORR_848_KHZ (1<<0) -#define FPGA_HF_READER_RX_XCORR_SNOOP (1<<1) -#define FPGA_HF_READER_RX_XCORR_QUARTER_FREQ (1<<2) +#define FPGA_HF_READER_RX_XCORR_848_KHZ (1<<0) +#define FPGA_HF_READER_RX_XCORR_SNOOP (1<<1) +#define FPGA_HF_READER_RX_XCORR_QUARTER_FREQ (1<<2) +#define FPGA_HF_READER_RX_XCORR_AMPLITUDE (1<<3) // Options for the HF simulated tag, how to modulate -#define FPGA_HF_SIMULATOR_NO_MODULATION (0<<0) -#define FPGA_HF_SIMULATOR_MODULATE_BPSK (1<<0) -#define FPGA_HF_SIMULATOR_MODULATE_212K (2<<0) -#define FPGA_HF_SIMULATOR_MODULATE_424K (4<<0) -#define FPGA_HF_SIMULATOR_MODULATE_424K_8BIT 0x5//101 +#define FPGA_HF_SIMULATOR_NO_MODULATION (0<<0) +#define FPGA_HF_SIMULATOR_MODULATE_BPSK (1<<0) +#define FPGA_HF_SIMULATOR_MODULATE_212K (2<<0) +#define FPGA_HF_SIMULATOR_MODULATE_424K (4<<0) +#define FPGA_HF_SIMULATOR_MODULATE_424K_8BIT 0x5//101 // Options for ISO14443A -#define FPGA_HF_ISO14443A_SNIFFER (0<<0) -#define FPGA_HF_ISO14443A_TAGSIM_LISTEN (1<<0) -#define FPGA_HF_ISO14443A_TAGSIM_MOD (2<<0) -#define FPGA_HF_ISO14443A_READER_LISTEN (3<<0) -#define FPGA_HF_ISO14443A_READER_MOD (4<<0) +#define FPGA_HF_ISO14443A_SNIFFER (0<<0) +#define FPGA_HF_ISO14443A_TAGSIM_LISTEN (1<<0) +#define FPGA_HF_ISO14443A_TAGSIM_MOD (2<<0) +#define FPGA_HF_ISO14443A_READER_LISTEN (3<<0) +#define FPGA_HF_ISO14443A_READER_MOD (4<<0) #endif diff --git a/armsrc/iclass.c b/armsrc/iclass.c index 1591a062..d27fc1c6 100644 --- a/armsrc/iclass.c +++ b/armsrc/iclass.c @@ -751,12 +751,9 @@ void RAMFUNC SnoopIClass(void) //if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,true)) break; //if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, true)) break; - if(tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - GetParity(Uart.output, Uart.byteCnt, parity); - LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, true); - } - + uint8_t parity[MAX_PARITY_SIZE]; + GetParity(Uart.output, Uart.byteCnt, parity); + LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, true); /* And ready to receive another command. */ Uart.state = STATE_UNSYNCD; @@ -779,11 +776,9 @@ void RAMFUNC SnoopIClass(void) rsamples = samples - Demod.samples; LED_B_ON(); - if(tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - GetParity(Demod.output, Demod.len, parity); - LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, false); - } + uint8_t parity[MAX_PARITY_SIZE]; + GetParity(Demod.output, Demod.len, parity); + LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, false); // And ready to receive another response. memset(&Demod, 0, sizeof(Demod)); @@ -1322,20 +1317,17 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf) t2r_time = GetCountSspClk(); } - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - GetParity(receivedCmd, len, parity); - LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, true); - - if (trace_data != NULL) { - GetParity(trace_data, trace_data_size, parity); - LogTrace(trace_data, trace_data_size, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, false); - } - if(!tracing) { - DbpString("Trace full"); - //break; - } + uint8_t parity[MAX_PARITY_SIZE]; + GetParity(receivedCmd, len, parity); + LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, true); + if (trace_data != NULL) { + GetParity(trace_data, trace_data_size, parity); + LogTrace(trace_data, trace_data_size, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, false); + } + if(!get_tracing()) { + DbpString("Trace full"); + //break; } } @@ -1509,11 +1501,9 @@ void ReaderTransmitIClass(uint8_t* frame, int len) LED_A_ON(); // Store reader command in buffer - if (tracing) { - uint8_t par[MAX_PARITY_SIZE]; - GetParity(frame, len, par); - LogTrace(frame, len, rsamples, rsamples, par, true); - } + uint8_t par[MAX_PARITY_SIZE]; + GetParity(frame, len, par); + LogTrace(frame, len, rsamples, rsamples, par, true); } //----------------------------------------------------------------------------- @@ -1569,11 +1559,9 @@ int ReaderReceiveIClass(uint8_t* receivedAnswer) int samples = 0; if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return false; rsamples += samples; - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - GetParity(receivedAnswer, Demod.len, parity); - LogTrace(receivedAnswer,Demod.len,rsamples,rsamples,parity,false); - } + uint8_t parity[MAX_PARITY_SIZE]; + GetParity(receivedAnswer, Demod.len, parity); + LogTrace(receivedAnswer,Demod.len,rsamples,rsamples,parity,false); if(samples == 0) return false; return Demod.len; } @@ -1715,7 +1703,7 @@ void ReaderIClass(uint8_t arg0) { // if only looking for one card try 2 times if we missed it the first time if (try_once && tryCnt > 2) break; tryCnt++; - if(!tracing) { + if(!get_tracing()) { DbpString("Trace full"); break; } @@ -1828,7 +1816,7 @@ void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) { WDT_HIT(); - if(!tracing) { + if(!get_tracing()) { DbpString("Trace full"); break; } diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index 7bf8f5af..f5fcc91c 100644 --- a/armsrc/iso14443a.c +++ b/armsrc/iso14443a.c @@ -1220,7 +1220,7 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data) EmSendPrecompiledCmd(p_response); } - if (!tracing) { + if (!get_tracing()) { Dbprintf("Trace Full. Simulation stopped."); break; } @@ -1619,9 +1619,7 @@ void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t LED_A_ON(); // Log reader command in trace buffer - if (tracing) { - LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, par, true); - } + LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, par, true); } @@ -1652,9 +1650,7 @@ void ReaderTransmit(uint8_t* frame, uint16_t len, uint32_t *timing) static int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity) { if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, offset)) return false; - if (tracing) { - LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, false); - } + LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, false); return Demod.len; } @@ -1662,9 +1658,7 @@ static int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) { if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, 0)) return false; - if (tracing) { - LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, false); - } + LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, false); return Demod.len; } diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index cb8567fa..76d7a075 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -386,10 +386,7 @@ void SimulateIso14443bTag(void) break; } - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(receivedCmd, len, 0, 0, parity, true); - } + LogTrace(receivedCmd, len, 0, 0, NULL, true); // Good, look at the command now. if ( (len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len) == 0) @@ -463,10 +460,7 @@ void SimulateIso14443bTag(void) } // trace the response: - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(resp, respLen, 0, 0, parity, false); - } + LogTrace(resp, respLen, 0, 0, NULL, false); } } @@ -763,9 +757,8 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) if (!quiet) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d", maxBehindBy, samples, gotFrame, Demod.len, Demod.sumI, Demod.sumQ); //Tracing - if (tracing && Demod.len > 0) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(Demod.output, Demod.len, 0, 0, parity, false); + if (Demod.len > 0) { + LogTrace(Demod.output, Demod.len, 0, 0, NULL, false); } } @@ -858,10 +851,7 @@ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) { CodeIso14443bAsReader(cmd, len); TransmitFor14443b(); - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(cmd,len, 0, 0, parity, true); - } + LogTrace(cmd,len, 0, 0, NULL, true); } /* Sends an APDU to the tag @@ -1153,7 +1143,6 @@ void RAMFUNC SnoopIso14443b(void) upTo = dmaBuf; lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); - uint8_t parity[MAX_PARITY_SIZE]; bool TagIsActive = false; bool ReaderIsActive = false; @@ -1198,9 +1187,7 @@ void RAMFUNC SnoopIso14443b(void) if (!TagIsActive) { // no need to try decoding reader data if the tag is sending if(Handle14443bUartBit(ci & 0x01)) { triggered = true; - if(tracing) { - LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, true); - } + LogTrace(Uart.output, Uart.byteCnt, samples, samples, NULL, true); /* And ready to receive another command. */ UartReset(); /* And also reset the demod code, which might have been */ @@ -1209,9 +1196,7 @@ void RAMFUNC SnoopIso14443b(void) } if(Handle14443bUartBit(cq & 0x01)) { triggered = true; - if(tracing) { - LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, true); - } + LogTrace(Uart.output, Uart.byteCnt, samples, samples, NULL, true); /* And ready to receive another command. */ UartReset(); /* And also reset the demod code, which might have been */ @@ -1223,13 +1208,8 @@ void RAMFUNC SnoopIso14443b(void) if(!ReaderIsActive && triggered) { // no need to try decoding tag data if the reader is sending or not yet triggered if(Handle14443bSamplesDemod(ci/2, cq/2)) { - //Use samples as a time measurement - if(tracing) - { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(Demod.output, Demod.len, samples, samples, parity, false); - } + LogTrace(Demod.output, Demod.len, samples, samples, NULL, false); // And ready to receive another response. DemodReset(); } diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c index da2aab69..f6868297 100644 --- a/armsrc/iso15693.c +++ b/armsrc/iso15693.c @@ -47,9 +47,10 @@ // *) add anti-collision support for inventory-commands // *) read security status of a block // *) sniffing and simulation do not support two subcarrier modes. -// *) remove or refactor code under "depricated" +// *) remove or refactor code under "deprecated" // *) document all the functions +#include "iso15693.h" #include "proxmark3.h" #include "util.h" @@ -58,6 +59,7 @@ #include "iso15693tools.h" #include "protocols.h" #include "cmd.h" +#include "BigBuf.h" #define arraylen(x) (sizeof(x)/sizeof((x)[0])) @@ -68,27 +70,20 @@ static int DEBUG = 0; // This section basicly contains transmission and receiving of bits /////////////////////////////////////////////////////////////////////// -#define FrameSOF Iso15693FrameSOF -#define Logic0 Iso15693Logic0 -#define Logic1 Iso15693Logic1 -#define FrameEOF Iso15693FrameEOF - #define Crc(data,datalen) Iso15693Crc(data,datalen) #define AddCrc(data,datalen) Iso15693AddCrc(data,datalen) #define sprintUID(target,uid) Iso15693sprintUID(target,uid) -// approximate amplitude=sqrt(ci^2+cq^2) by amplitude = max(|ci|,|cq|) + 1/2*min(|ci|,|cq|) -#define AMPLITUDE(ci, cq) (MAX(ABS(ci), ABS(cq)) + MIN(ABS(ci), ABS(cq))/2) - // buffers -#define ISO15693_DMA_BUFFER_SIZE 128 -#define ISO15693_MAX_RESPONSE_LENGTH 36 // allows read single block with the maximum block size of 256bits. Read multiple blocks not supported yet -#define ISO15693_MAX_COMMAND_LENGTH 45 // allows write single block with the maximum block size of 256bits. Write multiple blocks not supported yet +#define ISO15693_DMA_BUFFER_SIZE 2048 // must be a power of 2 +#define ISO15693_MAX_RESPONSE_LENGTH 36 // allows read single block with the maximum block size of 256bits. Read multiple blocks not supported yet +#define ISO15693_MAX_COMMAND_LENGTH 45 // allows write single block with the maximum block size of 256bits. Write multiple blocks not supported yet // timing. Delays in SSP_CLK ticks. #define DELAY_READER_TO_ARM 8 #define DELAY_ARM_TO_READER 1 #define DELAY_ISO15693_VCD_TO_VICC 132 // 132/423.75kHz = 311.5us from end of EOF to start of tag response +#define DELAY_ISO15693_VICC_TO_VCD 1017 // 1017/3.39MHz = 300us between end of tag response and next reader command // --------------------------- // Signal Processing @@ -271,11 +266,13 @@ static void CodeIso15693AsTag(uint8_t *cmd, int n) // Transmit the command (to the tag) that was placed in cmd[]. -static void TransmitTo15693Tag(const uint8_t *cmd, int len) +static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time) { FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); + while (GetCountSspClk() < start_time); + LED_B_ON(); for(int c = 0; c < len; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { @@ -302,6 +299,7 @@ static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start } while (GetCountSspClk() < (start_time & 0xfffffff8)) ; + AT91C_BASE_SSC->SSC_THR = 0x00; // clear TXRDY LED_C_ON(); @@ -329,7 +327,7 @@ static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start //============================================================================= // An ISO 15693 decoder for tag responses (one subcarrier only). -// Uses cross correlation to identify the SOF, each bit, and EOF. +// Uses cross correlation to identify each bit and EOF. // This function is called 8 times per bit (every 2 subcarrier cycles). // Subcarrier frequency fs is 424kHz, 1/fs = 2,36us, // i.e. function is called every 4,72us @@ -341,16 +339,15 @@ static void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start // false if we are still waiting for some more //============================================================================= -#define SUBCARRIER_DETECT_THRESHOLD 2 -#define SOF_CORRELATOR_LEN (1<<5) +#define NOISE_THRESHOLD 30 // don't try to correlate noise typedef struct DecodeTag { enum { - STATE_TAG_UNSYNCD, - STATE_TAG_AWAIT_SOF_1, - STATE_TAG_AWAIT_SOF_2, + STATE_TAG_SOF_LOW, + STATE_TAG_SOF_HIGH, + STATE_TAG_SOF_HIGH_END, STATE_TAG_RECEIVING_DATA, - STATE_TAG_AWAIT_EOF + STATE_TAG_EOF } state; int bitCount; int posCount; @@ -361,84 +358,68 @@ typedef struct DecodeTag { SOF_PART2 } lastBit; uint16_t shiftReg; + uint16_t max_len; uint8_t *output; int len; int sum1, sum2; - uint8_t SOF_low; - uint8_t SOF_high; - uint8_t SOF_last; - int32_t SOF_corr; - int32_t SOF_corr_prev; - uint8_t SOF_correlator[SOF_CORRELATOR_LEN]; } DecodeTag_t; -static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTag) + +static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag) { switch(DecodeTag->state) { - case STATE_TAG_UNSYNCD: - // initialize SOF correlator. We are looking for 12 samples low and 12 samples high. - DecodeTag->SOF_low = 0; - DecodeTag->SOF_high = 12; - DecodeTag->SOF_last = 23; - memset(DecodeTag->SOF_correlator, 0x00, DecodeTag->SOF_last + 1); - DecodeTag->SOF_correlator[DecodeTag->SOF_last] = AMPLITUDE(ci,cq); - DecodeTag->SOF_corr = DecodeTag->SOF_correlator[DecodeTag->SOF_last]; - DecodeTag->SOF_corr_prev = DecodeTag->SOF_corr; - // initialize Decoder - DecodeTag->posCount = 0; - DecodeTag->bitCount = 0; - DecodeTag->len = 0; - DecodeTag->state = STATE_TAG_AWAIT_SOF_1; - break; - - case STATE_TAG_AWAIT_SOF_1: - // calculate the correlation in real time. Look at differences only. - DecodeTag->SOF_corr += DecodeTag->SOF_correlator[DecodeTag->SOF_low++]; - DecodeTag->SOF_corr -= 2*DecodeTag->SOF_correlator[DecodeTag->SOF_high++]; - DecodeTag->SOF_last++; - DecodeTag->SOF_low &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_high &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_last &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_correlator[DecodeTag->SOF_last] = AMPLITUDE(ci,cq); - DecodeTag->SOF_corr += DecodeTag->SOF_correlator[DecodeTag->SOF_last]; - - // if correlation increases for 10 consecutive samples, we are close to maximum correlation - if (DecodeTag->SOF_corr > DecodeTag->SOF_corr_prev + SUBCARRIER_DETECT_THRESHOLD) { + case STATE_TAG_SOF_LOW: + // waiting for 12 times low (11 times low is accepted as well) + if (amplitude < NOISE_THRESHOLD) { DecodeTag->posCount++; } else { - DecodeTag->posCount = 0; + if (DecodeTag->posCount > 10) { + DecodeTag->posCount = 1; + DecodeTag->sum1 = 0; + DecodeTag->state = STATE_TAG_SOF_HIGH; + } else { + DecodeTag->posCount = 0; + } } - - if (DecodeTag->posCount == 10) { // correlation increased 10 times - DecodeTag->state = STATE_TAG_AWAIT_SOF_2; + break; + + case STATE_TAG_SOF_HIGH: + // waiting for 10 times high. Take average over the last 8 + if (amplitude > NOISE_THRESHOLD) { + DecodeTag->posCount++; + if (DecodeTag->posCount > 2) { + DecodeTag->sum1 += amplitude; // keep track of average high value + } + if (DecodeTag->posCount == 10) { + DecodeTag->sum1 >>= 4; // calculate half of average high value (8 samples) + DecodeTag->state = STATE_TAG_SOF_HIGH_END; + } + } else { // high phase was too short + DecodeTag->posCount = 1; + DecodeTag->state = STATE_TAG_SOF_LOW; } - - DecodeTag->SOF_corr_prev = DecodeTag->SOF_corr; - break; - case STATE_TAG_AWAIT_SOF_2: - // calculate the correlation in real time. Look at differences only. - DecodeTag->SOF_corr += DecodeTag->SOF_correlator[DecodeTag->SOF_low++]; - DecodeTag->SOF_corr -= 2*DecodeTag->SOF_correlator[DecodeTag->SOF_high++]; - DecodeTag->SOF_last++; - DecodeTag->SOF_low &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_high &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_last &= (SOF_CORRELATOR_LEN-1); - DecodeTag->SOF_correlator[DecodeTag->SOF_last] = AMPLITUDE(ci,cq); - DecodeTag->SOF_corr += DecodeTag->SOF_correlator[DecodeTag->SOF_last]; - - if (DecodeTag->SOF_corr >= DecodeTag->SOF_corr_prev) { // we are looking for the maximum correlation - DecodeTag->SOF_corr_prev = DecodeTag->SOF_corr; - } else { - DecodeTag->lastBit = SOF_PART1; // detected 1st part of SOF - DecodeTag->sum1 = DecodeTag->SOF_correlator[DecodeTag->SOF_last]; + case STATE_TAG_SOF_HIGH_END: + // waiting for a falling edge + if (amplitude < DecodeTag->sum1) { // signal drops below 50% average high: a falling edge + DecodeTag->lastBit = SOF_PART1; // detected 1st part of SOF (12 samples low and 12 samples high) + DecodeTag->shiftReg = 0; + DecodeTag->bitCount = 0; + DecodeTag->len = 0; + DecodeTag->sum1 = amplitude; DecodeTag->sum2 = 0; DecodeTag->posCount = 2; DecodeTag->state = STATE_TAG_RECEIVING_DATA; LED_C_ON(); + } else { + DecodeTag->posCount++; + if (DecodeTag->posCount > 13) { // high phase too long + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } } - break; case STATE_TAG_RECEIVING_DATA: @@ -446,23 +427,27 @@ static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTa DecodeTag->sum1 = 0; DecodeTag->sum2 = 0; } - if (DecodeTag->posCount <= 4) { - DecodeTag->sum1 += AMPLITUDE(ci, cq); + DecodeTag->sum1 += amplitude; } else { - DecodeTag->sum2 += AMPLITUDE(ci, cq); + DecodeTag->sum2 += amplitude; } - if (DecodeTag->posCount == 8) { - int16_t corr_1 = (DecodeTag->sum2 - DecodeTag->sum1) / 4; - int16_t corr_0 = (DecodeTag->sum1 - DecodeTag->sum2) / 4; - int16_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 8; + int32_t corr_1 = DecodeTag->sum2 - DecodeTag->sum1; + int32_t corr_0 = -corr_1; + int32_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 2; if (corr_EOF > corr_0 && corr_EOF > corr_1) { - DecodeTag->state = STATE_TAG_AWAIT_EOF; + if (DecodeTag->lastBit == LOGIC0) { // this was already part of EOF + DecodeTag->state = STATE_TAG_EOF; + } else { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } } else if (corr_1 > corr_0) { // logic 1 if (DecodeTag->lastBit == SOF_PART1) { // still part of SOF - DecodeTag->lastBit = SOF_PART2; + DecodeTag->lastBit = SOF_PART2; // SOF completed } else { DecodeTag->lastBit = LOGIC1; DecodeTag->shiftReg >>= 1; @@ -471,6 +456,12 @@ static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTa if (DecodeTag->bitCount == 8) { DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; DecodeTag->len++; + if (DecodeTag->len > DecodeTag->max_len) { + // buffer overflow, give up + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } DecodeTag->bitCount = 0; DecodeTag->shiftReg = 0; } @@ -478,7 +469,8 @@ static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTa } else { // logic 0 if (DecodeTag->lastBit == SOF_PART1) { // incomplete SOF - DecodeTag->state = STATE_TAG_UNSYNCD; + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; LED_C_OFF(); } else { DecodeTag->lastBit = LOGIC0; @@ -487,6 +479,12 @@ static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTa if (DecodeTag->bitCount == 8) { DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; DecodeTag->len++; + if (DecodeTag->len > DecodeTag->max_len) { + // buffer overflow, give up + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } DecodeTag->bitCount = 0; DecodeTag->shiftReg = 0; } @@ -497,89 +495,106 @@ static int Handle15693SamplesFromTag(int8_t ci, int8_t cq, DecodeTag_t *DecodeTa DecodeTag->posCount++; break; - case STATE_TAG_AWAIT_EOF: - if (DecodeTag->lastBit == LOGIC0) { // this was already part of EOF - LED_C_OFF(); - return true; + case STATE_TAG_EOF: + if (DecodeTag->posCount == 1) { + DecodeTag->sum1 = 0; + DecodeTag->sum2 = 0; + } + if (DecodeTag->posCount <= 4) { + DecodeTag->sum1 += amplitude; } else { - DecodeTag->state = STATE_TAG_UNSYNCD; - LED_C_OFF(); + DecodeTag->sum2 += amplitude; } + if (DecodeTag->posCount == 8) { + int32_t corr_1 = DecodeTag->sum2 - DecodeTag->sum1; + int32_t corr_0 = -corr_1; + int32_t corr_EOF = (DecodeTag->sum1 + DecodeTag->sum2) / 2; + if (corr_EOF > corr_0 || corr_1 > corr_0) { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } else { + LED_C_OFF(); + return true; + } + } + DecodeTag->posCount++; break; - default: - DecodeTag->state = STATE_TAG_UNSYNCD; - LED_C_OFF(); - break; } return false; } -static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data) +static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_len) { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; DecodeTag->output = data; - DecodeTag->state = STATE_TAG_UNSYNCD; + DecodeTag->max_len = max_len; +} + + +static void DecodeTagReset(DecodeTag_t *DecodeTag) +{ + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; } + /* * Receive and decode the tag response, also log to tracebuffer */ -static int GetIso15693AnswerFromTag(uint8_t* response, int timeout) +static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int timeout) { - int maxBehindBy = 0; - int lastRxCounter, samples = 0; - int8_t ci, cq; + int samples = 0; bool gotFrame = false; - uint16_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; - + uint16_t *dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); + // the Decoder data structure - DecodeTag_t DecodeTag; - DecodeTagInit(&DecodeTag, response); + DecodeTag_t DecodeTag = { 0 }; + DecodeTagInit(&DecodeTag, response, max_len); // wait for last transfer to complete while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); // And put the FPGA in the appropriate mode - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_AMPLITUDE); // Setup and start DMA. FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); uint16_t *upTo = dmaBuf; - lastRxCounter = ISO15693_DMA_BUFFER_SIZE; for(;;) { - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO15693_DMA_BUFFER_SIZE-1); - if(behindBy > maxBehindBy) { - maxBehindBy = behindBy; - } + uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); - if (behindBy < 1) continue; + if (behindBy == 0) continue; - ci = (int8_t)(*upTo >> 8); - cq = (int8_t)(*upTo & 0xff); + uint16_t tagdata = *upTo++; - upTo++; - lastRxCounter--; if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. upTo = dmaBuf; // start reading the circular buffer from the beginning - lastRxCounter += ISO15693_DMA_BUFFER_SIZE; + if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); + break; + } } if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers } + samples++; - if (Handle15693SamplesFromTag(ci, cq, &DecodeTag)) { + if (Handle15693SamplesFromTag(tagdata, &DecodeTag)) { gotFrame = true; break; } - if(samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) { + if (samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) { DecodeTag.len = 0; break; } @@ -587,11 +602,12 @@ static int GetIso15693AnswerFromTag(uint8_t* response, int timeout) } FpgaDisableSscDma(); + BigBuf_free(); + + if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", + samples, gotFrame, DecodeTag.state, DecodeTag.len, DecodeTag.bitCount, DecodeTag.posCount); - if (DEBUG) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", - maxBehindBy, samples, gotFrame, DecodeTag.state, DecodeTag.len, DecodeTag.bitCount, DecodeTag.posCount); - - if (tracing && DecodeTag.len > 0) { + if (DecodeTag.len > 0) { LogTrace(DecodeTag.output, DecodeTag.len, 0, 0, NULL, false); } @@ -636,14 +652,32 @@ typedef struct DecodeReader { } DecodeReader_t; -static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader) +static void DecodeReaderInit(DecodeReader_t* DecodeReader, uint8_t *data, uint16_t max_len) +{ + DecodeReader->output = data; + DecodeReader->byteCountMax = max_len; + DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReader->byteCount = 0; + DecodeReader->bitCount = 0; + DecodeReader->posCount = 1; + DecodeReader->shiftReg = 0; +} + + +static void DecodeReaderReset(DecodeReader_t* DecodeReader) +{ + DecodeReader->state = STATE_READER_UNSYNCD; +} + + +static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uint8_t bit, DecodeReader_t *restrict DecodeReader) { switch(DecodeReader->state) { case STATE_READER_UNSYNCD: if(!bit) { // we went low, so this could be the beginning of a SOF - DecodeReader->state = STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF; DecodeReader->posCount = 1; + DecodeReader->state = STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF; } break; @@ -651,13 +685,13 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader DecodeReader->posCount++; if(bit) { // detected rising edge if(DecodeReader->posCount < 4) { // rising edge too early (nominally expected at 5) - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // SOF DecodeReader->state = STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF; } } else { if(DecodeReader->posCount > 5) { // stayed low for too long - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting } @@ -668,19 +702,19 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader DecodeReader->posCount++; if(!bit) { // detected a falling edge if (DecodeReader->posCount < 20) { // falling edge too early (nominally expected at 21 earliest) - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else if (DecodeReader->posCount < 23) { // SOF for 1 out of 4 coding DecodeReader->Coding = CODING_1_OUT_OF_4; DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; } else if (DecodeReader->posCount < 28) { // falling edge too early (nominally expected at 29 latest) - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // SOF for 1 out of 4 coding DecodeReader->Coding = CODING_1_OUT_OF_256; DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; } } else { if(DecodeReader->posCount > 29) { // stayed high for too long - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting } @@ -692,7 +726,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader if (bit) { // detected rising edge if (DecodeReader->Coding == CODING_1_OUT_OF_256) { if (DecodeReader->posCount < 32) { // rising edge too early (nominally expected at 33) - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { DecodeReader->posCount = 1; DecodeReader->bitCount = 0; @@ -703,7 +737,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader } } else { // CODING_1_OUT_OF_4 if (DecodeReader->posCount < 24) { // rising edge too early (nominally expected at 25) - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { DecodeReader->state = STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4; } @@ -711,13 +745,13 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader } else { if (DecodeReader->Coding == CODING_1_OUT_OF_256) { if (DecodeReader->posCount > 34) { // signal stayed low for too long - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting } } else { // CODING_1_OUT_OF_4 if (DecodeReader->posCount > 26) { // signal stayed low for too long - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } else { // do nothing, keep waiting } @@ -739,7 +773,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader // do nothing, keep waiting } } else { // unexpected falling edge - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } break; @@ -761,7 +795,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader int corr11 = (DecodeReader->sum1 + DecodeReader->sum2) / 2; if (corr01 > corr11 && corr01 > corr10) { // EOF LED_B_OFF(); // Finished receiving - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); if (DecodeReader->byteCount != 0) { return true; } @@ -775,9 +809,10 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader if (DecodeReader->byteCount > DecodeReader->byteCountMax) { // buffer overflow, give up LED_B_OFF(); - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } DecodeReader->bitCount = 0; + DecodeReader->shiftReg = 0; } else { DecodeReader->bitCount++; } @@ -802,7 +837,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader int corr11 = (DecodeReader->sum1 + DecodeReader->sum2) / 2; if (corr01 > corr11 && corr01 > corr10) { // EOF LED_B_OFF(); // Finished receiving - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); if (DecodeReader->byteCount != 0) { return true; } @@ -815,7 +850,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader if (DecodeReader->byteCount > DecodeReader->byteCountMax) { // buffer overflow, give up LED_B_OFF(); - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); } } DecodeReader->bitCount++; @@ -824,7 +859,7 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader default: LED_B_OFF(); - DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReaderReset(DecodeReader); break; } @@ -832,18 +867,6 @@ static int Handle15693SampleFromReader(uint8_t bit, DecodeReader_t* DecodeReader } -static void DecodeReaderInit(uint8_t *data, uint16_t max_len, DecodeReader_t* DecodeReader) -{ - DecodeReader->output = data; - DecodeReader->byteCountMax = max_len; - DecodeReader->state = STATE_READER_UNSYNCD; - DecodeReader->byteCount = 0; - DecodeReader->bitCount = 0; - DecodeReader->posCount = 0; - DecodeReader->shiftReg = 0; -} - - //----------------------------------------------------------------------------- // Receive a command (from the reader to us, where we are the simulated tag), // and store it in the given buffer, up to the given maximum length. Keeps @@ -856,16 +879,15 @@ static void DecodeReaderInit(uint8_t *data, uint16_t max_len, DecodeReader_t* De static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time) { - int maxBehindBy = 0; - int lastRxCounter, samples = 0; + int samples = 0; bool gotFrame = false; uint8_t b; - uint8_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; + uint8_t *dmaBuf = BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE); // the decoder data structure DecodeReader_t DecodeReader = {0}; - DecodeReaderInit(received, max_len, &DecodeReader); + DecodeReaderInit(&DecodeReader, received, max_len); // wait for last transfer to complete while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); @@ -883,21 +905,19 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 // Setup and start DMA. FpgaSetupSscDma(dmaBuf, ISO15693_DMA_BUFFER_SIZE); uint8_t *upTo = dmaBuf; - lastRxCounter = ISO15693_DMA_BUFFER_SIZE; for(;;) { - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO15693_DMA_BUFFER_SIZE-1); - if(behindBy > maxBehindBy) { - maxBehindBy = behindBy; - } + uint16_t behindBy = ((uint8_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); - if (behindBy < 1) continue; + if (behindBy == 0) continue; b = *upTo++; - lastRxCounter--; if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. upTo = dmaBuf; // start reading the circular buffer from the beginning - lastRxCounter += ISO15693_DMA_BUFFER_SIZE; + if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); + break; + } } if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and @@ -927,11 +947,12 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 FpgaDisableSscDma(); + BigBuf_free_keep_EM(); + + if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", + samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount); - if (DEBUG) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", - maxBehindBy, samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount); - - if (tracing && DecodeReader.byteCount > 0) { + if (DecodeReader.byteCount > 0) { LogTrace(DecodeReader.output, DecodeReader.byteCount, 0, 0, NULL, true); } @@ -939,7 +960,29 @@ static int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint3 } -static void BuildIdentifyRequest(void); +// Encode (into the ToSend buffers) an identify request, which is the first +// thing that you must send to a tag to get a response. +static void BuildIdentifyRequest(void) +{ + uint8_t cmd[5]; + + uint16_t crc; + // one sub-carrier, inventory, 1 slot, fast rate + // AFI is at bit 5 (1<<4) when doing an INVENTORY + cmd[0] = (1 << 2) | (1 << 5) | (1 << 1); + // inventory command code + cmd[1] = 0x01; + // no mask + cmd[2] = 0x00; + //Now the CRC + crc = Crc(cmd, 3); + cmd[3] = crc & 0xff; + cmd[4] = crc >> 8; + + CodeIso15693AsReader(cmd, sizeof(cmd)); +} + + //----------------------------------------------------------------------------- // Start to read an ISO 15693 tag. We send an identify request, then wait // for the response. The response is not demodulated, just left in the buffer @@ -980,18 +1023,12 @@ void AcquireRawAdcSamplesIso15693(void) while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_AMPLITUDE); for(int c = 0; c < 4000; ) { if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - uint16_t iq = AT91C_BASE_SSC->SSC_RHR; - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates. We just want power, - // so abs(I) + abs(Q) is close to what we want. - int8_t i = (int8_t)(iq >> 8); - int8_t q = (int8_t)(iq & 0xff); - uint8_t r = AMPLITUDE(i, q); - dest[c++] = r; + uint16_t r = AT91C_BASE_SSC->SSC_RHR; + dest[c++] = r >> 5; } } @@ -1000,49 +1037,139 @@ void AcquireRawAdcSamplesIso15693(void) } -// TODO: there is no trigger condition. The 14000 samples represent a time frame of 66ms. -// It is unlikely that we get something meaningful. -// TODO: Currently we only record tag answers. Add tracing of reader commands. -// TODO: would we get something at all? The carrier is switched on... -void RecordRawAdcSamplesIso15693(void) +void SnoopIso15693(void) { - LEDsoff(); - LED_A_ON(); + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + BigBuf_free(); - uint8_t *dest = BigBuf_get_addr(); + clear_trace(); + set_tracing(true); - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - // Setup SSC - FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); - // Start from off (no field generated) - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(200); + // The DMA buffer, used to stream samples from the FPGA + uint16_t* dmaBuf = (uint16_t*)BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE*sizeof(uint16_t)); + uint16_t *upTo; + + // Count of samples received so far, so that we can include timing + // information in the trace buffer. + int samples = 0; + + DecodeTag_t DecodeTag = {0}; + uint8_t response[ISO15693_MAX_RESPONSE_LENGTH]; + DecodeTagInit(&DecodeTag, response, sizeof(response)); + DecodeReader_t DecodeReader = {0};; + uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; + DecodeReaderInit(&DecodeReader, cmd, sizeof(cmd)); + + // Print some debug information about the buffer sizes + if (DEBUG) { + Dbprintf("Snooping buffers initialized:"); + Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen()); + Dbprintf(" Reader -> tag: %i bytes", ISO15693_MAX_COMMAND_LENGTH); + Dbprintf(" tag -> Reader: %i bytes", ISO15693_MAX_RESPONSE_LENGTH); + Dbprintf(" DMA: %i bytes", ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t)); + } + Dbprintf("Snoop started. Press button to stop."); + + // Signal field is off, no reader signal, no tag signal + LEDsoff(); + // And put the FPGA in the appropriate mode + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_SNOOP | FPGA_HF_READER_RX_XCORR_AMPLITUDE); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - SpinDelay(100); + // Setup for the DMA. + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); - LED_D_ON(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + bool TagIsActive = false; + bool ReaderIsActive = false; + bool ExpectTagAnswer = false; - for(int c = 0; c < 14000;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - uint16_t iq = AT91C_BASE_SSC->SSC_RHR; - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates. We just want power, - // so abs(I) + abs(Q) is close to what we want. - int8_t i = (int8_t)(iq >> 8); - int8_t q = (int8_t)(iq & 0xff); - uint8_t r = AMPLITUDE(i, q); - dest[c++] = r; + // And now we loop, receiving samples. + for(;;) { + uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); + + if (behindBy == 0) continue; + + uint16_t snoopdata = *upTo++; + + if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning + if(behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d, samples=%d", behindBy, samples); + break; + } + if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and + AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers + WDT_HIT(); + if(BUTTON_PRESS()) { + DbpString("Snoop stopped."); + break; + } + } + } + samples++; + + if (!TagIsActive) { // no need to try decoding reader data if the tag is sending + if (Handle15693SampleFromReader(snoopdata & 0x02, &DecodeReader)) { + FpgaDisableSscDma(); + ExpectTagAnswer = true; + LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); + /* And ready to receive another command. */ + DecodeReaderReset(&DecodeReader); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DecodeTagReset(&DecodeTag); + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + } + if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) { + FpgaDisableSscDma(); + ExpectTagAnswer = true; + LogTrace(DecodeReader.output, DecodeReader.byteCount, samples, samples, NULL, true); + /* And ready to receive another command. */ + DecodeReaderReset(&DecodeReader); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DecodeTagReset(&DecodeTag); + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + } + ReaderIsActive = (DecodeReader.state >= STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF); } + + if (!ReaderIsActive && ExpectTagAnswer) { // no need to try decoding tag data if the reader is currently sending or no answer expected yet + if (Handle15693SamplesFromTag(snoopdata >> 2, &DecodeTag)) { + FpgaDisableSscDma(); + //Use samples as a time measurement + LogTrace(DecodeTag.output, DecodeTag.len, samples, samples, NULL, false); + // And ready to receive another response. + DecodeTagReset(&DecodeTag); + DecodeReaderReset(&DecodeReader); + ExpectTagAnswer = false; + upTo = dmaBuf; + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + } + TagIsActive = (DecodeTag.state >= STATE_TAG_RECEIVING_DATA); + } + } - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LED_D_OFF(); - Dbprintf("finished recording"); - LED_A_OFF(); + FpgaDisableSscDma(); + BigBuf_free(); + + LEDsoff(); + + DbpString("Snoop statistics:"); + Dbprintf(" ExpectTagAnswer: %d", ExpectTagAnswer); + Dbprintf(" DecodeTag State: %d", DecodeTag.state); + Dbprintf(" DecodeTag byteCnt: %d", DecodeTag.len); + Dbprintf(" DecodeReader State: %d", DecodeReader.state); + Dbprintf(" DecodeReader byteCnt: %d", DecodeReader.byteCount); + Dbprintf(" Trace length: %d", BigBuf_get_traceLen()); } @@ -1072,27 +1199,6 @@ static void Iso15693InitReader() { // This section basically contains transmission and receiving of bits /////////////////////////////////////////////////////////////////////// -// Encode (into the ToSend buffers) an identify request, which is the first -// thing that you must send to a tag to get a response. -static void BuildIdentifyRequest(void) -{ - uint8_t cmd[5]; - - uint16_t crc; - // one sub-carrier, inventory, 1 slot, fast rate - // AFI is at bit 5 (1<<4) when doing an INVENTORY - cmd[0] = (1 << 2) | (1 << 5) | (1 << 1); - // inventory command code - cmd[1] = 0x01; - // no mask - cmd[2] = 0x00; - //Now the CRC - crc = Crc(cmd, 3); - cmd[3] = crc & 0xff; - cmd[4] = crc >> 8; - - CodeIso15693AsReader(cmd, sizeof(cmd)); -} // uid is in transmission order (which is reverse of display order) static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) @@ -1100,12 +1206,11 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) uint8_t cmd[13]; uint16_t crc; - // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block - // followed by teh block data - // one sub-carrier, inventory, 1 slot, fast rate - cmd[0] = (1 << 6)| (1 << 5) | (1 << 1); // no SELECT bit, ADDR bit, OPTION bit + // If we set the Option_Flag in this request, the VICC will respond with the security status of the block + // followed by the block data + cmd[0] = ISO15693_REQ_OPTION | ISO15693_REQ_ADDRESS | ISO15693_REQ_DATARATE_HIGH; // READ BLOCK command code - cmd[1] = 0x20; + cmd[1] = ISO15693_READBLOCK; // UID may be optionally specified here // 64-bit UID cmd[2] = uid[0]; @@ -1117,7 +1222,7 @@ static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber ) cmd[8] = uid[6]; cmd[9] = uid[7]; // 0xe0; // always e0 (not exactly unique) // Block number to read - cmd[10] = blockNumber;//0x00; + cmd[10] = blockNumber; //Now the CRC crc = Crc(cmd, 11); // the crc needs to be calculated over 11 bytes cmd[11] = crc & 0xff; @@ -1156,10 +1261,9 @@ static void BuildInventoryResponse(uint8_t *uid) // Universal Method for sending to and recv bytes from a tag // init ... should we initialize the reader? // speed ... 0 low speed, 1 hi speed -// **recv will return you a pointer to the received data -// If you do not need the answer use NULL for *recv[] +// *recv will contain the tag's answer // return: lenght of received data -int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv) { +int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t *recv, uint16_t max_recv_len, uint32_t start_time) { LED_A_ON(); LED_B_OFF(); @@ -1168,8 +1272,6 @@ int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv if (init) Iso15693InitReader(); int answerLen=0; - uint8_t *answer = BigBuf_get_addr() + 4000; - if (recv != NULL) memset(answer, 0, 100); if (!speed) { // low speed (1 out of 256) @@ -1179,11 +1281,11 @@ int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv CodeIso15693AsReader(send, sendlen); } - TransmitTo15693Tag(ToSend,ToSendMax); + TransmitTo15693Tag(ToSend, ToSendMax, start_time); + // Now wait for a response - if (recv!=NULL) { - answerLen = GetIso15693AnswerFromTag(answer, 100); - *recv=answer; + if (recv != NULL) { + answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, DELAY_ISO15693_VCD_TO_VICC * 2); } LED_A_OFF(); @@ -1202,46 +1304,46 @@ void DbdecodeIso15693Answer(int len, uint8_t *d) { char status[DBD15STATLEN+1]={0}; uint16_t crc; - if (len>3) { - if (d[0]&(1<<3)) - strncat(status,"ProtExt ",DBD15STATLEN); - if (d[0]&1) { + if (len > 3) { + if (d[0] & ISO15693_RES_EXT) + strncat(status,"ProtExt ", DBD15STATLEN); + if (d[0] & ISO15693_RES_ERROR) { // error - strncat(status,"Error ",DBD15STATLEN); + strncat(status,"Error ", DBD15STATLEN); switch (d[1]) { case 0x01: - strncat(status,"01:notSupp",DBD15STATLEN); + strncat(status,"01:notSupp", DBD15STATLEN); break; case 0x02: - strncat(status,"02:notRecog",DBD15STATLEN); + strncat(status,"02:notRecog", DBD15STATLEN); break; case 0x03: - strncat(status,"03:optNotSupp",DBD15STATLEN); + strncat(status,"03:optNotSupp", DBD15STATLEN); break; case 0x0f: - strncat(status,"0f:noInfo",DBD15STATLEN); + strncat(status,"0f:noInfo", DBD15STATLEN); break; case 0x10: - strncat(status,"10:dontExist",DBD15STATLEN); + strncat(status,"10:doesn'tExist", DBD15STATLEN); break; case 0x11: - strncat(status,"11:lockAgain",DBD15STATLEN); + strncat(status,"11:lockAgain", DBD15STATLEN); break; case 0x12: - strncat(status,"12:locked",DBD15STATLEN); + strncat(status,"12:locked", DBD15STATLEN); break; case 0x13: - strncat(status,"13:progErr",DBD15STATLEN); + strncat(status,"13:progErr", DBD15STATLEN); break; case 0x14: - strncat(status,"14:lockErr",DBD15STATLEN); + strncat(status,"14:lockErr", DBD15STATLEN); break; default: - strncat(status,"unknownErr",DBD15STATLEN); + strncat(status,"unknownErr", DBD15STATLEN); } - strncat(status," ",DBD15STATLEN); + strncat(status," ", DBD15STATLEN); } else { - strncat(status,"NoErr ",DBD15STATLEN); + strncat(status,"NoErr ", DBD15STATLEN); } crc=Crc(d,len-2); @@ -1266,6 +1368,7 @@ void SetDebugIso15693(uint32_t debug) { return; } + //----------------------------------------------------------------------------- // Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector // all demodulation performed in arm rather than host. - greg @@ -1275,13 +1378,14 @@ void ReaderIso15693(uint32_t parameter) LEDsoff(); LED_A_ON(); - int answerLen1 = 0; + set_tracing(true); + + int answerLen = 0; uint8_t TagUID[8] = {0x00}; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - uint8_t *answer1 = BigBuf_get_addr() + 4000; - memset(answer1, 0x00, 200); + uint8_t answer[ISO15693_MAX_RESPONSE_LENGTH]; SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Setup SSC @@ -1295,37 +1399,39 @@ void ReaderIso15693(uint32_t parameter) LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); SpinDelay(200); + StartCountSspClk(); + // FIRST WE RUN AN INVENTORY TO GET THE TAG UID // THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME // Now send the IDENTIFY command BuildIdentifyRequest(); - - TransmitTo15693Tag(ToSend,ToSendMax); + TransmitTo15693Tag(ToSend, ToSendMax, 0); // Now wait for a response - answerLen1 = GetIso15693AnswerFromTag(answer1, 100) ; + answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC * 2) ; + uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD; - if (answerLen1 >=12) // we should do a better check than this + if (answerLen >=12) // we should do a better check than this { - TagUID[0] = answer1[2]; - TagUID[1] = answer1[3]; - TagUID[2] = answer1[4]; - TagUID[3] = answer1[5]; - TagUID[4] = answer1[6]; - TagUID[5] = answer1[7]; - TagUID[6] = answer1[8]; // IC Manufacturer code - TagUID[7] = answer1[9]; // always E0 + TagUID[0] = answer[2]; + TagUID[1] = answer[3]; + TagUID[2] = answer[4]; + TagUID[3] = answer[5]; + TagUID[4] = answer[6]; + TagUID[5] = answer[7]; + TagUID[6] = answer[8]; // IC Manufacturer code + TagUID[7] = answer[9]; // always E0 } - Dbprintf("%d octets read from IDENTIFY request:", answerLen1); - DbdecodeIso15693Answer(answerLen1, answer1); - Dbhexdump(answerLen1, answer1, false); + Dbprintf("%d octets read from IDENTIFY request:", answerLen); + DbdecodeIso15693Answer(answerLen, answer); + Dbhexdump(answerLen, answer, false); // UID is reverse - if (answerLen1 >= 12) + if (answerLen >= 12) Dbprintf("UID = %02hX%02hX%02hX%02hX%02hX%02hX%02hX%02hX", TagUID[7],TagUID[6],TagUID[5],TagUID[4], TagUID[3],TagUID[2],TagUID[1],TagUID[0]); @@ -1340,18 +1446,21 @@ void ReaderIso15693(uint32_t parameter) // Dbhexdump(answerLen3,answer3,true); // read all pages - if (answerLen1 >= 12 && DEBUG) { - uint8_t *answer2 = BigBuf_get_addr() + 4100; + if (answerLen >= 12 && DEBUG) { + + // debugptr = BigBuf_get_addr(); + int i = 0; while (i < 32) { // sanity check, assume max 32 pages BuildReadBlockRequest(TagUID, i); - TransmitTo15693Tag(ToSend, ToSendMax); - int answerLen2 = GetIso15693AnswerFromTag(answer2, 100); - if (answerLen2 > 0) { - Dbprintf("READ SINGLE BLOCK %d returned %d octets:", i, answerLen2); - DbdecodeIso15693Answer(answerLen2, answer2); - Dbhexdump(answerLen2, answer2, false); - if ( *((uint32_t*) answer2) == 0x07160101 ) break; // exit on NoPageErr + TransmitTo15693Tag(ToSend, ToSendMax, start_time); + int answerLen = GetIso15693AnswerFromTag(answer, sizeof(answer), DELAY_ISO15693_VCD_TO_VICC * 2); + start_time = GetCountSspClk() + DELAY_ISO15693_VICC_TO_VCD; + if (answerLen > 0) { + Dbprintf("READ SINGLE BLOCK %d returned %d octets:", i, answerLen); + DbdecodeIso15693Answer(answerLen, answer); + Dbhexdump(answerLen, answer, false); + if ( *((uint32_t*) answer) == 0x07160101 ) break; // exit on NoPageErr } i++; } @@ -1412,12 +1521,14 @@ void BruteforceIso15693Afi(uint32_t speed) LEDsoff(); LED_A_ON(); - uint8_t data[20]; - uint8_t *recv=data; + uint8_t data[6]; + uint8_t recv[ISO15693_MAX_RESPONSE_LENGTH]; + int datalen=0, recvlen=0; Iso15693InitReader(); - + StartCountSspClk(); + // first without AFI // Tags should respond without AFI and with AFI=0 even when AFI is active @@ -1425,10 +1536,11 @@ void BruteforceIso15693Afi(uint32_t speed) data[1] = ISO15693_INVENTORY; data[2] = 0; // mask length datalen = AddCrc(data,3); - recvlen = SendDataTag(data, datalen, false, speed, &recv); + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), 0); + uint32_t start_time = GetCountSspClk() + DELAY_ISO15693_VCD_TO_VICC; WDT_HIT(); if (recvlen>=12) { - Dbprintf("NoAFI UID=%s",sprintUID(NULL,&recv[2])); + Dbprintf("NoAFI UID=%s", sprintUID(NULL, &recv[2])); } // now with AFI @@ -1438,13 +1550,14 @@ void BruteforceIso15693Afi(uint32_t speed) data[2] = 0; // AFI data[3] = 0; // mask length - for (int i=0;i<256;i++) { - data[2]=i & 0xFF; - datalen=AddCrc(data,4); - recvlen=SendDataTag(data, datalen, false, speed, &recv); + for (int i = 0; i < 256; i++) { + data[2] = i & 0xFF; + datalen = AddCrc(data,4); + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time); + start_time = GetCountSspClk() + DELAY_ISO15693_VCD_TO_VICC; WDT_HIT(); - if (recvlen>=12) { - Dbprintf("AFI=%i UID=%s", i, sprintUID(NULL,&recv[2])); + if (recvlen >= 12) { + Dbprintf("AFI=%i UID=%s", i, sprintUID(NULL, &recv[2])); } } Dbprintf("AFI Bruteforcing done."); @@ -1456,26 +1569,27 @@ void BruteforceIso15693Afi(uint32_t speed) // Allows to directly send commands to the tag via the client void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint8_t data[]) { - int recvlen=0; - uint8_t *recvbuf = BigBuf_get_addr(); + int recvlen = 0; + uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; LED_A_ON(); if (DEBUG) { - Dbprintf("SEND"); + Dbprintf("SEND:"); Dbhexdump(datalen, data, false); } - recvlen = SendDataTag(data, datalen, true, speed, (recv?&recvbuf:NULL)); + recvlen = SendDataTag(data, datalen, true, speed, (recv?recvbuf:NULL), sizeof(recvbuf), 0); if (recv) { - cmd_send(CMD_ACK, recvlen>48?48:recvlen, 0, 0, recvbuf, 48); - if (DEBUG) { - Dbprintf("RECV"); - DbdecodeIso15693Answer(recvlen,recvbuf); + Dbprintf("RECV:"); Dbhexdump(recvlen, recvbuf, false); + DbdecodeIso15693Answer(recvlen, recvbuf); } + + cmd_send(CMD_ACK, recvlen>ISO15693_MAX_RESPONSE_LENGTH?ISO15693_MAX_RESPONSE_LENGTH:recvlen, 0, 0, recvbuf, ISO15693_MAX_RESPONSE_LENGTH); + } // for the time being, switch field off to protect rdv4.0 diff --git a/armsrc/iso15693.h b/armsrc/iso15693.h new file mode 100644 index 00000000..e5b78a8a --- /dev/null +++ b/armsrc/iso15693.h @@ -0,0 +1,24 @@ +//----------------------------------------------------------------------------- +// Piwi - October 2018 +// +// This code is licensed to you under the terms of the GNU GPL, version 2 or, +// at your option, any later version. See the LICENSE.txt file for the text of +// the license. +//----------------------------------------------------------------------------- +// Routines to support ISO 15693. +//----------------------------------------------------------------------------- + +#ifndef __ISO15693_H +#define __ISO15693_H + +#include + +void SnoopIso15693(void); +void AcquireRawAdcSamplesIso15693(void); +void ReaderIso15693(uint32_t parameter); +void SimTagIso15693(uint32_t parameter, uint8_t *uid); +void BruteforceIso15693Afi(uint32_t speed); +void DirectTag15693Command(uint32_t datalen,uint32_t speed, uint32_t recv, uint8_t data[]); +void SetDebugIso15693(uint32_t flag); + +#endif diff --git a/client/cmdhf.c b/client/cmdhf.c index 56b1cb3d..744a95d2 100644 --- a/client/cmdhf.c +++ b/client/cmdhf.c @@ -264,7 +264,7 @@ uint16_t printTraceLine(uint16_t tracepos, uint16_t traceLen, uint8_t *trace, ui uint8_t parityBits = parityBytes[j>>3]; if (protocol != ISO_14443B && (isResponse || protocol == ISO_14443A) && (oddparity8(frame[j]) != ((parityBits >> (7-(j&0x0007))) & 0x01))) { - snprintf(line[j/16]+(( j % 16) * 4),110, "%02x! ", frame[j]); + snprintf(line[j/16]+(( j % 16) * 4), 110, " %02x!", frame[j]); } else { snprintf(line[j/16]+(( j % 16) * 4), 110, " %02x ", frame[j]); } @@ -281,14 +281,11 @@ uint16_t printTraceLine(uint16_t tracepos, uint16_t traceLen, uint8_t *trace, ui } } - if(data_len == 0) - { - if(data_len == 0){ - sprintf(line[0],""); - } + if (data_len == 0) { + sprintf(line[0]," "); } - //--- Draw the CRC column + //--- Draw the CRC column char *crc = (crcStatus == 0 ? "!crc" : (crcStatus == 1 ? " ok " : " ")); EndOfTransmissionTimestamp = timestamp + duration; diff --git a/client/cmdhf15.c b/client/cmdhf15.c index e5f4af31..da83ccaf 100644 --- a/client/cmdhf15.c +++ b/client/cmdhf15.c @@ -38,15 +38,54 @@ #include "protocols.h" #include "cmdmain.h" -#define FrameSOF Iso15693FrameSOF -#define Logic0 Iso15693Logic0 -#define Logic1 Iso15693Logic1 -#define FrameEOF Iso15693FrameEOF - #define Crc(data,datalen) Iso15693Crc(data,datalen) #define AddCrc(data,datalen) Iso15693AddCrc(data,datalen) #define sprintUID(target,uid) Iso15693sprintUID(target,uid) +// SOF defined as +// 1) Unmodulated time of 56.64us +// 2) 24 pulses of 423.75khz +// 3) logic '1' (unmodulated for 18.88us followed by 8 pulses of 423.75khz) + +static const int Iso15693FrameSOF[] = { + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + -1, -1, -1, -1, + -1, -1, -1, -1, + 1, 1, 1, 1, + 1, 1, 1, 1 +}; +static const int Iso15693Logic0[] = { + 1, 1, 1, 1, + 1, 1, 1, 1, + -1, -1, -1, -1, + -1, -1, -1, -1 +}; +static const int Iso15693Logic1[] = { + -1, -1, -1, -1, + -1, -1, -1, -1, + 1, 1, 1, 1, + 1, 1, 1, 1 +}; + +// EOF defined as +// 1) logic '0' (8 pulses of 423.75khz followed by unmodulated for 18.88us) +// 2) 24 pulses of 423.75khz +// 3) Unmodulated time of 56.64us + +static const int Iso15693FrameEOF[] = { + 1, 1, 1, 1, + 1, 1, 1, 1, + -1, -1, -1, -1, + -1, -1, -1, -1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 +}; + // structure and database for uid -> tagtype lookups typedef struct { uint64_t uid; @@ -293,8 +332,8 @@ int CmdHF15Demod(const char *Cmd) // First, correlate for SOF for (i = 0; i < 200; i++) { int corr = 0; - for (j = 0; j < arraylen(FrameSOF); j += skip) { - corr += FrameSOF[j] * GraphBuffer[i + (j / skip)]; + for (j = 0; j < arraylen(Iso15693FrameSOF); j += skip) { + corr += Iso15693FrameSOF[j] * GraphBuffer[i + (j / skip)]; } if (corr > max) { max = corr; @@ -302,28 +341,28 @@ int CmdHF15Demod(const char *Cmd) } } PrintAndLog("SOF at %d, correlation %d", maxPos, - max / (arraylen(FrameSOF) / skip)); + max / (arraylen(Iso15693FrameSOF) / skip)); - i = maxPos + arraylen(FrameSOF) / skip; + i = maxPos + arraylen(Iso15693FrameSOF) / skip; int k = 0; uint8_t outBuf[20]; memset(outBuf, 0, sizeof(outBuf)); uint8_t mask = 0x01; for (;;) { int corr0 = 0, corr00 = 0, corr01 = 0, corr1 = 0, corrEOF = 0; - for(j = 0; j < arraylen(Logic0); j += skip) { - corr0 += Logic0[j]*GraphBuffer[i+(j/skip)]; + for(j = 0; j < arraylen(Iso15693Logic0); j += skip) { + corr0 += Iso15693Logic0[j]*GraphBuffer[i+(j/skip)]; } corr01 = corr00 = corr0; - for(j = 0; j < arraylen(Logic0); j += skip) { - corr00 += Logic0[j]*GraphBuffer[i+arraylen(Logic0)/skip+(j/skip)]; - corr01 += Logic1[j]*GraphBuffer[i+arraylen(Logic0)/skip+(j/skip)]; + for(j = 0; j < arraylen(Iso15693Logic0); j += skip) { + corr00 += Iso15693Logic0[j]*GraphBuffer[i+arraylen(Iso15693Logic0)/skip+(j/skip)]; + corr01 += Iso15693Logic1[j]*GraphBuffer[i+arraylen(Iso15693Logic0)/skip+(j/skip)]; } - for(j = 0; j < arraylen(Logic1); j += skip) { - corr1 += Logic1[j]*GraphBuffer[i+(j/skip)]; + for(j = 0; j < arraylen(Iso15693Logic1); j += skip) { + corr1 += Iso15693Logic1[j]*GraphBuffer[i+(j/skip)]; } - for(j = 0; j < arraylen(FrameEOF); j += skip) { - corrEOF += FrameEOF[j]*GraphBuffer[i+(j/skip)]; + for(j = 0; j < arraylen(Iso15693FrameEOF); j += skip) { + corrEOF += Iso15693FrameEOF[j]*GraphBuffer[i+(j/skip)]; } // Even things out by the length of the target waveform. corr00 *= 2; @@ -335,17 +374,17 @@ int CmdHF15Demod(const char *Cmd) PrintAndLog("EOF at %d", i); break; } else if (corr1 > corr0) { - i += arraylen(Logic1) / skip; + i += arraylen(Iso15693Logic1) / skip; outBuf[k] |= mask; } else { - i += arraylen(Logic0) / skip; + i += arraylen(Iso15693Logic0) / skip; } mask <<= 1; if (mask == 0) { k++; mask = 0x01; } - if ((i + (int)arraylen(FrameEOF)) >= GraphTraceLen) { + if ((i + (int)arraylen(Iso15693FrameEOF)) >= GraphTraceLen) { PrintAndLog("ran off end!"); break; } @@ -374,10 +413,9 @@ int CmdHF15Read(const char *Cmd) } // Record Activity without enabling carrier -// TODO: currently it DOES enable the carrier -int CmdHF15Record(const char *Cmd) +int CmdHF15Snoop(const char *Cmd) { - UsbCommand c = {CMD_RECORD_RAW_ADC_SAMPLES_ISO_15693}; + UsbCommand c = {CMD_SNOOP_ISO_15693}; SendCommand(&c); return 0; } @@ -514,7 +552,7 @@ static command_t CommandTable15[] = {"help", CmdHF15Help, 1, "This help"}, {"demod", CmdHF15Demod, 1, "Demodulate ISO15693 from tag"}, {"read", CmdHF15Read, 0, "Read HF tag (ISO 15693)"}, - {"record", CmdHF15Record, 0, "Record Samples (ISO 15693)"}, // atrox + {"snoop", CmdHF15Snoop, 0, "Eavesdrop ISO 15693 communications"}, {"reader", CmdHF15Reader, 0, "Act like an ISO15693 reader"}, {"sim", CmdHF15Sim, 0, "Fake an ISO15693 tag"}, {"cmd", CmdHF15Cmd, 0, "Send direct commands to ISO15693 tag"}, diff --git a/common/iso15693tools.h b/common/iso15693tools.h index 96095fba..d9f59cc6 100644 --- a/common/iso15693tools.h +++ b/common/iso15693tools.h @@ -14,57 +14,4 @@ int Iso15693AddCrc(uint8_t *req, int n); char* Iso15693sprintUID(char *target,uint8_t *uid); unsigned short iclass_crc16(char *data_p, unsigned short length); -//----------------------------------------------------------------------------- -// Map a sequence of octets (~layer 2 command) into the set of bits to feed -// to the FPGA, to transmit that command to the tag. -// Mode: highspeed && one subcarrier (ASK) -//----------------------------------------------------------------------------- - - // The sampling rate is 106.353 ksps/s, for T = 18.8 us - - // SOF defined as - // 1) Unmodulated time of 56.64us - // 2) 24 pulses of 423.75khz - // 3) logic '1' (unmodulated for 18.88us followed by 8 pulses of 423.75khz) - - static const int Iso15693FrameSOF[] = { - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - -1, -1, -1, -1, - -1, -1, -1, -1, - 1, 1, 1, 1, - 1, 1, 1, 1 - }; - static const int Iso15693Logic0[] = { - 1, 1, 1, 1, - 1, 1, 1, 1, - -1, -1, -1, -1, - -1, -1, -1, -1 - }; - static const int Iso15693Logic1[] = { - -1, -1, -1, -1, - -1, -1, -1, -1, - 1, 1, 1, 1, - 1, 1, 1, 1 - }; - - // EOF defined as - // 1) logic '0' (8 pulses of 423.75khz followed by unmodulated for 18.88us) - // 2) 24 pulses of 423.75khz - // 3) Unmodulated time of 56.64us - - static const int Iso15693FrameEOF[] = { - 1, 1, 1, 1, - 1, 1, 1, 1, - -1, -1, -1, -1, - -1, -1, -1, -1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, - -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 - }; - - #endif diff --git a/fpga/fpga_hf.bit b/fpga/fpga_hf.bit index bd296174..f16fd061 100644 Binary files a/fpga/fpga_hf.bit and b/fpga/fpga_hf.bit differ diff --git a/fpga/fpga_hf.v b/fpga/fpga_hf.v index f99a43dd..5d55cb89 100644 --- a/fpga/fpga_hf.v +++ b/fpga/fpga_hf.v @@ -75,6 +75,8 @@ wire hi_read_rx_xcorr_848 = conf_word[0]; wire hi_read_rx_xcorr_snoop = conf_word[1]; // divide subcarrier frequency by 4 wire hi_read_rx_xcorr_quarter = conf_word[2]; +// send amplitude only instead of ci/cq pair +wire hi_read_rx_xcorr_amplitude = conf_word[3]; // For the high-frequency simulated tag: what kind of modulation to use. wire [2:0] hi_simulate_mod_type = conf_word[2:0]; @@ -102,7 +104,7 @@ hi_read_rx_xcorr hrxc( hrxc_ssp_frame, hrxc_ssp_din, ssp_dout, hrxc_ssp_clk, cross_hi, cross_lo, hrxc_dbg, - hi_read_rx_xcorr_848, hi_read_rx_xcorr_snoop, hi_read_rx_xcorr_quarter + hi_read_rx_xcorr_848, hi_read_rx_xcorr_snoop, hi_read_rx_xcorr_quarter, hi_read_rx_xcorr_amplitude ); hi_simulate hs( diff --git a/fpga/hi_read_rx_xcorr.v b/fpga/hi_read_rx_xcorr.v index 8233960f..503c8d67 100644 --- a/fpga/hi_read_rx_xcorr.v +++ b/fpga/hi_read_rx_xcorr.v @@ -10,7 +10,7 @@ module hi_read_rx_xcorr( ssp_frame, ssp_din, ssp_dout, ssp_clk, cross_hi, cross_lo, dbg, - xcorr_is_848, snoop, xcorr_quarter_freq + xcorr_is_848, snoop, xcorr_quarter_freq, hi_read_rx_xcorr_amplitude ); input pck0, ck_1356meg, ck_1356megb; output pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4; @@ -20,7 +20,7 @@ module hi_read_rx_xcorr( output ssp_frame, ssp_din, ssp_clk; input cross_hi, cross_lo; output dbg; - input xcorr_is_848, snoop, xcorr_quarter_freq; + input xcorr_is_848, snoop, xcorr_quarter_freq, hi_read_rx_xcorr_amplitude; // Carrier is steady on through this, unless we're snooping. assign pwr_hi = ck_1356megb & (~snoop); @@ -83,11 +83,46 @@ reg signed [13:0] corr_q_accum; // we will report maximum 8 significant bits reg signed [7:0] corr_i_out; reg signed [7:0] corr_q_out; + // clock and frame signal for communication to ARM reg ssp_clk; reg ssp_frame; + +// the amplitude of the subcarrier is sqrt(ci^2 + cq^2). +// approximate by amplitude = max(|ci|,|cq|) + 1/2*min(|ci|,|cq|) +reg [13:0] corr_amplitude, abs_ci, abs_cq, max_ci_cq, min_ci_cq; + + +always @(corr_i_accum or corr_q_accum) +begin + if (corr_i_accum[13] == 1'b0) + abs_ci <= corr_i_accum; + else + abs_ci <= -corr_i_accum; + + if (corr_q_accum[13] == 1'b0) + abs_cq <= corr_q_accum; + else + abs_cq <= -corr_q_accum; + + if (abs_ci > abs_cq) + begin + max_ci_cq <= abs_ci; + min_ci_cq <= abs_cq; + end + else + begin + max_ci_cq <= abs_cq; + min_ci_cq <= abs_ci; + end + + corr_amplitude <= max_ci_cq + min_ci_cq/2; + +end + + // The subcarrier reference signals reg subcarrier_I; reg subcarrier_Q; @@ -110,52 +145,75 @@ begin subcarrier_Q = ~(corr_i_cnt[4] ^ corr_i_cnt[3]); end end - + + // ADC data appears on the rising edge, so sample it on the falling edge always @(negedge adc_clk) begin // These are the correlators: we correlate against in-phase and quadrature - // versions of our reference signal, and keep the (signed) result to - // send out later over the SSP. + // versions of our reference signal, and keep the (signed) results or the + // resulting amplitude to send out later over the SSP. if(corr_i_cnt == 6'd0) begin if(snoop) begin - // Send 7 most significant bits of tag signal (signed), plus 1 bit reader signal - if (corr_i_accum[13:11] == 3'b000 || corr_i_accum[13:11] == 3'b111) - corr_i_out <= {corr_i_accum[11:5], after_hysteresis_prev_prev}; - else // truncate to maximum value - if (corr_i_accum[13] == 1'b0) - corr_i_out <= {7'b0111111, after_hysteresis_prev_prev}; - else - corr_i_out <= {7'b1000000, after_hysteresis_prev_prev}; - if (corr_q_accum[13:11] == 3'b000 || corr_q_accum[13:11] == 3'b111) - corr_q_out <= {corr_q_accum[11:5], after_hysteresis_prev}; - else // truncate to maximum value - if (corr_q_accum[13] == 1'b0) - corr_q_out <= {7'b0111111, after_hysteresis_prev}; - else - corr_q_out <= {7'b1000000, after_hysteresis_prev}; - after_hysteresis_prev_prev <= after_hysteresis; + if (hi_read_rx_xcorr_amplitude) + begin + // send amplitude plus 2 bits reader signal + corr_i_out <= corr_amplitude[13:6]; + corr_q_out <= {corr_amplitude[5:0], after_hysteresis_prev_prev, after_hysteresis_prev}; + end + else + begin + // Send 7 most significant bits of in phase tag signal (signed), plus 1 bit reader signal + if (corr_i_accum[13:11] == 3'b000 || corr_i_accum[13:11] == 3'b111) + corr_i_out <= {corr_i_accum[11:5], after_hysteresis_prev_prev}; + else // truncate to maximum value + if (corr_i_accum[13] == 1'b0) + corr_i_out <= {7'b0111111, after_hysteresis_prev_prev}; + else + corr_i_out <= {7'b1000000, after_hysteresis_prev_prev}; + // Send 7 most significant bits of quadrature phase tag signal (signed), plus 1 bit reader signal + if (corr_q_accum[13:11] == 3'b000 || corr_q_accum[13:11] == 3'b111) + corr_q_out <= {corr_q_accum[11:5], after_hysteresis_prev}; + else // truncate to maximum value + if (corr_q_accum[13] == 1'b0) + corr_q_out <= {7'b0111111, after_hysteresis_prev}; + else + corr_q_out <= {7'b1000000, after_hysteresis_prev}; + end end else begin - // Send 8 bits of tag signal - if (corr_i_accum[13:11] == 3'b000 || corr_i_accum[13:11] == 3'b111) - corr_i_out <= corr_i_accum[11:4]; - else // truncate to maximum value - if (corr_i_accum[13] == 1'b0) - corr_i_out <= 8'b01111111; - else - corr_i_out <= 8'b10000000; - if (corr_q_accum[13:11] == 3'b000 || corr_q_accum[13:11] == 3'b111) - corr_q_out <= corr_q_accum[11:4]; - else // truncate to maximum value - if (corr_q_accum[13] == 1'b0) - corr_q_out <= 8'b01111111; - else - corr_q_out <= 8'b10000000; + if (hi_read_rx_xcorr_amplitude) + begin + // send amplitude + corr_i_out <= {2'b00, corr_amplitude[13:8]}; + corr_q_out <= corr_amplitude[7:0]; + end + else + begin + // Send 8 bits of in phase tag signal + if (corr_i_accum[13:11] == 3'b000 || corr_i_accum[13:11] == 3'b111) + corr_i_out <= corr_i_accum[11:4]; + else // truncate to maximum value + if (corr_i_accum[13] == 1'b0) + corr_i_out <= 8'b01111111; + else + corr_i_out <= 8'b10000000; + // Send 8 bits of quadrature phase tag signal + if (corr_q_accum[13:11] == 3'b000 || corr_q_accum[13:11] == 3'b111) + corr_q_out <= corr_q_accum[11:4]; + else // truncate to maximum value + if (corr_q_accum[13] == 1'b0) + corr_q_out <= 8'b01111111; + else + corr_q_out <= 8'b10000000; + end end + + // for each Q/I pair report two reader signal samples when sniffing. Store the 1st. + after_hysteresis_prev_prev <= after_hysteresis; // Initialize next correlation. // Both I and Q reference signals are high when corr_i_nct == 0. Therefore need to accumulate. corr_i_accum <= $signed({1'b0,adc_d}); @@ -172,16 +230,16 @@ begin corr_q_accum <= corr_q_accum + $signed({1'b0,adc_d}); else corr_q_accum <= corr_q_accum - $signed({1'b0,adc_d}); - end - // for each Q/I pair report two reader signal samples when sniffing + // for each Q/I pair report two reader signal samples when sniffing. Store the 2nd. if(corr_i_cnt == 6'd32) after_hysteresis_prev <= after_hysteresis; // Then the result from last time is serialized and send out to the ARM. // We get one report each cycle, and each report is 16 bits, so the - // ssp_clk should be the adc_clk divided by 64/16 = 4. + // ssp_clk should be the adc_clk divided by 64/16 = 4. + // ssp_clk frequency = 13,56MHz / 4 = 3.39MHz if(corr_i_cnt[1:0] == 2'b10) ssp_clk <= 1'b0; diff --git a/include/usb_cmd.h b/include/usb_cmd.h index e73aa2a7..785435f0 100644 --- a/include/usb_cmd.h +++ b/include/usb_cmd.h @@ -125,7 +125,7 @@ typedef struct{ #define CMD_ISO_14443B_COMMAND 0x0305 #define CMD_READER_ISO_15693 0x0310 #define CMD_SIMTAG_ISO_15693 0x0311 -#define CMD_RECORD_RAW_ADC_SAMPLES_ISO_15693 0x0312 +#define CMD_SNOOP_ISO_15693 0x0312 #define CMD_ISO_15693_COMMAND 0x0313 #define CMD_ISO_15693_COMMAND_DONE 0x0314 #define CMD_ISO_15693_FIND_AFI 0x0315