X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/cee5a30d53c7aff4c4830eae53eaf58414ecf806..24d48e60fc5b29d317467cc260c40cad2bb6f695:/armsrc/iclass.c?ds=sidebyside diff --git a/armsrc/iclass.c b/armsrc/iclass.c index d1bb8df3..c673bb54 100644 --- a/armsrc/iclass.c +++ b/armsrc/iclass.c @@ -2,6 +2,7 @@ // Gerhard de Koning Gans - May 2008 // Hagen Fritsch - June 2010 // Gerhard de Koning Gans - May 2011 +// Gerhard de Koning Gans - June 2012 - Added iClass card and reader emulation // // 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 @@ -15,11 +16,6 @@ // Please feel free to contribute and extend iClass support!! //----------------------------------------------------------------------------- // -// TODO: -// ===== -// - iClass emulation -// - reader emulation -// // FIX: // ==== // We still have sometimes a demodulation error when snooping iClass communication. @@ -44,12 +40,13 @@ #include "apps.h" #include "util.h" #include "string.h" +#include "common.h" +// Needed for CRC in emulation mode; +// same construction as in ISO 14443; +// different initial value (CRC_ICLASS) +#include "iso14443crc.h" -#include "iclass.h" - -static uint8_t *trace = (uint8_t *) BigBuf; -static int traceLen = 0; -static int rsamples = 0; +static int timeout = 4096; // CARD TO READER // Sequence D: 11110000 modulation with subcarrier during first half @@ -59,42 +56,11 @@ static int rsamples = 0; // Sequence X: 00001100 drop after half a period // Sequence Y: 00000000 no drop // Sequence Z: 11000000 drop at start -#define SEC_D 0xf0 -#define SEC_E 0x0f -#define SEC_F 0x00 #define SEC_X 0x0c #define SEC_Y 0x00 #define SEC_Z 0xc0 -static const uint8_t OddByteParity[256] = { - 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, - 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, - 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, - 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, - 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, - 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, - 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, - 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, - 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, - 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, - 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, - 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, - 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, - 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, - 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, - 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1 -}; - -//static const uint8_t MajorityNibble[16] = { 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1 }; -//static const uint8_t MajorityNibble[16] = { 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }; - -// BIG CHANGE - UNDERSTAND THIS BEFORE WE COMMIT -#define RECV_CMD_OFFSET 3032 -#define RECV_RES_OFFSET 3096 -#define DMA_BUFFER_OFFSET 3160 -#define DMA_BUFFER_SIZE 4096 -#define TRACE_LENGTH 3000 - +static int SendIClassAnswer(uint8_t *resp, int respLen, int delay); //----------------------------------------------------------------------------- // The software UART that receives commands from the reader, and its state @@ -114,8 +80,8 @@ static struct { int nOutOfCnt; int OutOfCnt; int syncBit; - int parityBits; - int samples; + int parityBits; + int samples; int highCnt; int swapper; int counter; @@ -124,9 +90,9 @@ static struct { uint8_t *output; } Uart; -static RAMFUNC int MillerDecoding(int bit) +static RAMFUNC int OutOfNDecoding(int bit) { - int error = 0; + //int error = 0; int bitright; if(!Uart.bitBuffer) { @@ -194,7 +160,7 @@ static RAMFUNC int MillerDecoding(int bit) // When not part of SOF or EOF, it is an error Uart.state = STATE_UNSYNCD; Uart.highCnt = 0; - error = 4; + //error = 4; } } } @@ -206,10 +172,10 @@ static RAMFUNC int MillerDecoding(int bit) if(!bit) { if(Uart.dropPosition) { if(Uart.state == STATE_START_OF_COMMUNICATION) { - error = 1; + //error = 1; } else { - error = 7; + //error = 7; } // It is an error if we already have seen a drop in current frame Uart.state = STATE_UNSYNCD; @@ -249,7 +215,7 @@ static RAMFUNC int MillerDecoding(int bit) if(!Uart.dropPosition) { Uart.state = STATE_UNSYNCD; Uart.highCnt = 0; - error = 9; + //error = 9; } else { Uart.shiftReg >>= 2; @@ -283,7 +249,7 @@ static RAMFUNC int MillerDecoding(int bit) if(!Uart.dropPosition) { Uart.state = STATE_UNSYNCD; Uart.highCnt = 0; - error = 3; + //error = 3; } else { Uart.dropPosition--; @@ -359,7 +325,7 @@ static RAMFUNC int MillerDecoding(int bit) Uart.OutOfCnt = 4; // Start at 1/4, could switch to 1/256 Uart.dropPosition = 0; Uart.shiftReg = 0; - error = 0; + //error = 0; } else { Uart.highCnt = 0; @@ -376,7 +342,7 @@ static RAMFUNC int MillerDecoding(int bit) } //============================================================================= -// ISO 14443 Type A - Manchester +// Manchester //============================================================================= static struct { @@ -434,28 +400,6 @@ static RAMFUNC int ManchesterDecoding(int v) Demod.syncBit = 0; //Demod.samples = 0; Demod.posCount = 1; // This is the first half bit period, so after syncing handle the second part - /* if(bit & 0x08) { Demod.syncBit = 0x08; } - if(!Demod.syncBit) { - if(bit & 0x04) { Demod.syncBit = 0x04; } - } - else if(bit & 0x04) { Demod.syncBit = 0x04; bit <<= 4; } - if(!Demod.syncBit) { - if(bit & 0x02) { Demod.syncBit = 0x02; } - } - else if(bit & 0x02) { Demod.syncBit = 0x02; bit <<= 4; } - if(!Demod.syncBit) { - if(bit & 0x01) { Demod.syncBit = 0x01; } - - if(Demod.syncBit && (Demod.buffer & 0x08)) { - Demod.syncBit = 0x08; - - // The first half bitperiod is expected in next sample - Demod.posCount = 0; - Demod.output[Demod.len] = 0xfb; - } - } - else if(bit & 0x01) { Demod.syncBit = 0x01; } - */ if(bit & 0x08) { Demod.syncBit = 0x08; @@ -711,7 +655,7 @@ static RAMFUNC int ManchesterDecoding(int v) } //============================================================================= -// Finally, a `sniffer' for ISO 14443 Type A +// Finally, a `sniffer' for iClass communication // Both sides of communication! //============================================================================= @@ -722,16 +666,17 @@ static RAMFUNC int ManchesterDecoding(int v) //----------------------------------------------------------------------------- void RAMFUNC SnoopIClass(void) { -// #define RECV_CMD_OFFSET 2032 // original (working as of 21/2/09) values -// #define RECV_RES_OFFSET 2096 // original (working as of 21/2/09) values -// #define DMA_BUFFER_OFFSET 2160 // original (working as of 21/2/09) values -// #define DMA_BUFFER_SIZE 4096 // original (working as of 21/2/09) values -// #define TRACE_LENGTH 2000 // original (working as of 21/2/09) values +// DEFINED ABOVE +// #define RECV_CMD_OFFSET 3032 +// #define RECV_RES_OFFSET 3096 +// #define DMA_BUFFER_OFFSET 3160 +// #define DMA_BUFFER_SIZE 4096 +// #define TRACE_SIZE 3000 // We won't start recording the frames that we acquire until we trigger; // a good trigger condition to get started is probably when we see a // response from the tag. - int triggered = FALSE; // FALSE to wait first for card + //int triggered = FALSE; // FALSE to wait first for card // The command (reader -> tag) that we're receiving. // The length of a received command will in most cases be no more than 18 bytes. @@ -744,7 +689,10 @@ void RAMFUNC SnoopIClass(void) // into trace, along with its length and other annotations. //uint8_t *trace = (uint8_t *)BigBuf; - traceLen = 0; // uncommented to fix ISSUE 15 - gerhard - jan2011 + // reset traceLen to 0 + iso14a_set_tracing(TRUE); + iso14a_clear_trace(); + iso14a_set_trigger(FALSE); // The DMA buffer, used to stream samples from the FPGA int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET; @@ -837,7 +785,7 @@ void RAMFUNC SnoopIClass(void) if((div + 1) % 2 == 0) { smpl = decbyter; - if(MillerDecoding((smpl & 0xF0) >> 4)) { + if(OutOfNDecoding((smpl & 0xF0) >> 4)) { rsamples = samples - Uart.samples; LED_C_ON(); //if(triggered) { @@ -852,7 +800,7 @@ void RAMFUNC SnoopIClass(void) trace[traceLen++] = Uart.byteCnt; memcpy(trace+traceLen, receivedCmd, Uart.byteCnt); traceLen += Uart.byteCnt; - if(traceLen > TRACE_LENGTH) break; + if(traceLen > TRACE_SIZE) break; //} /* And ready to receive another command. */ Uart.state = STATE_UNSYNCD; @@ -884,9 +832,9 @@ void RAMFUNC SnoopIClass(void) trace[traceLen++] = Demod.len; memcpy(trace+traceLen, receivedResponse, Demod.len); traceLen += Demod.len; - if(traceLen > TRACE_LENGTH) break; + if(traceLen > TRACE_SIZE) break; - triggered = TRUE; + //triggered = TRUE; // And ready to receive another response. memset(&Demod, 0, sizeof(Demod)); @@ -917,7 +865,614 @@ done: Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]); LED_A_OFF(); LED_B_OFF(); - LED_C_OFF(); + LED_C_OFF(); + LED_D_OFF(); +} + +void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) { + int i; + for(i = 0; i < 8; i++) { + rotatedCSN[i] = (originalCSN[i] >> 3) | (originalCSN[(i+1)%8] << 5); + } +} + +//----------------------------------------------------------------------------- +// Wait for commands from reader +// Stop when button is pressed +// Or return TRUE when command is captured +//----------------------------------------------------------------------------- +static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen) +{ + // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen + // only, since we are receiving, not transmitting). + // Signal field is off with the appropriate LED + LED_D_OFF(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN); + + // Now run a `software UART' on the stream of incoming samples. + Uart.output = received; + Uart.byteCntMax = maxLen; + Uart.state = STATE_UNSYNCD; + + 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(OutOfNDecoding((b & 0xf0) >> 4)) { + *len = Uart.byteCnt; + return TRUE; + }*/ + if(OutOfNDecoding(b & 0x0f)) { + *len = Uart.byteCnt; + return TRUE; + } + } + } +} + + +//----------------------------------------------------------------------------- +// Prepare tag messages +//----------------------------------------------------------------------------- +static void CodeIClassTagAnswer(const uint8_t *cmd, int len) +{ + int i; + + ToSendReset(); + + // Send SOF + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0xff; + + for(i = 0; i < len; i++) { + int j; + uint8_t b = cmd[i]; + + // Data bits + for(j = 0; j < 8; j++) { + if(b & 1) { + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0xff; + } else { + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0x00; + } + b >>= 1; + } + } + + // Send EOF + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0x00; + + // Convert from last byte pos to length + ToSendMax++; +} + +// Only SOF +static void CodeIClassTagSOF() +{ + ToSendReset(); + + // Send SOF + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0xff; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0xff; + + // Convert from last byte pos to length + ToSendMax++; +} + +//----------------------------------------------------------------------------- +// Simulate iClass Card +// Only CSN (Card Serial Number) +// +//----------------------------------------------------------------------------- +void SimulateIClass(uint8_t arg0, uint8_t *datain) +{ + uint8_t simType = arg0; + + // Enable and clear the trace + tracing = TRUE; + traceLen = 0; + memset(trace, 0x44, TRACE_SIZE); + + // CSN followed by two CRC bytes + uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; + uint8_t response3[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 }; + + // e-Purse + uint8_t response4[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; + + if(simType == 0) { + // Use the CSN from commandline + memcpy(response3, datain, 8); + } + + // Construct anticollision-CSN + rotateCSN(response3,response2); + + // Compute CRC on both CSNs + ComputeCrc14443(CRC_ICLASS, response2, 8, &response2[8], &response2[9]); + ComputeCrc14443(CRC_ICLASS, response3, 8, &response3[8], &response3[9]); + + // Reader 0a + // Tag 0f + // Reader 0c + // Tag anticoll. CSN + // Reader 81 anticoll. CSN + // Tag CSN + + uint8_t *resp; + int respLen; + uint8_t* respdata = NULL; + int respsize = 0; + uint8_t sof = 0x0f; + + // Respond SOF -- takes 8 bytes + uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); + int resp1Len; + + // Anticollision CSN (rotated CSN) + // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit) + uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 10); + int resp2Len; + + // CSN + // 176: Takes 16 bytes for SOF/EOF and 10 * 16 = 160 bytes (2 bytes/bit) + uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 190); + int resp3Len; + + // e-Purse + // 144: Takes 16 bytes for SOF/EOF and 8 * 16 = 128 bytes (2 bytes/bit) + uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 370); + int resp4Len; + + // + 1720.. + uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET); + memset(receivedCmd, 0x44, RECV_CMD_SIZE); + int len; + + // Prepare card messages + ToSendMax = 0; + + // First card answer: SOF + CodeIClassTagSOF(); + memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax; + + // Anticollision CSN + CodeIClassTagAnswer(response2, sizeof(response2)); + memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax; + + // CSN + CodeIClassTagAnswer(response3, sizeof(response3)); + memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax; + + // e-Purse + CodeIClassTagAnswer(response4, sizeof(response4)); + memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax; + + // We need to listen to the high-frequency, peak-detected path. + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + FpgaSetupSsc(); + + // To control where we are in the protocol + int cmdsRecvd = 0; + + LED_A_ON(); + for(;;) { + LED_B_OFF(); + if(!GetIClassCommandFromReader(receivedCmd, &len, 100)) { + DbpString("button press"); + break; + } + + // Okay, look at the command now. + if(receivedCmd[0] == 0x0a) { + // Reader in anticollission phase + resp = resp1; respLen = resp1Len; //order = 1; + respdata = &sof; + respsize = sizeof(sof); + //resp = resp2; respLen = resp2Len; order = 2; + //DbpString("Hello request from reader:"); + } else if(receivedCmd[0] == 0x0c) { + // Reader asks for anticollission CSN + resp = resp2; respLen = resp2Len; //order = 2; + respdata = response2; + respsize = sizeof(response2); + //DbpString("Reader requests anticollission CSN:"); + } else if(receivedCmd[0] == 0x81) { + // Reader selects anticollission CSN. + // Tag sends the corresponding real CSN + resp = resp3; respLen = resp3Len; //order = 3; + respdata = response3; + respsize = sizeof(response3); + //DbpString("Reader selects anticollission CSN:"); + } else if(receivedCmd[0] == 0x88) { + // Read e-purse (88 02) + resp = resp4; respLen = resp4Len; //order = 4; + respdata = response4; + respsize = sizeof(response4); + LED_B_ON(); + } else if(receivedCmd[0] == 0x05) { + // Reader random and reader MAC!!! + // Lets store this ;-) +/* + Dbprintf(" CSN: %02x %02x %02x %02x %02x %02x %02x %02x", + response3[0], response3[1], response3[2], + response3[3], response3[4], response3[5], + response3[6], response3[7]); +*/ + Dbprintf("READER AUTH (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x", + len, + receivedCmd[0], receivedCmd[1], receivedCmd[2], + receivedCmd[3], receivedCmd[4], receivedCmd[5], + receivedCmd[6], receivedCmd[7], receivedCmd[8]); + + // Do not respond + // We do not know what to answer, so lets keep quit + resp = resp1; respLen = 0; //order = 5; + respdata = NULL; + respsize = 0; + } else if(receivedCmd[0] == 0x00 && len == 1) { + // Reader ends the session + resp = resp1; respLen = 0; //order = 0; + respdata = NULL; + respsize = 0; + } else { + // Never seen this command before + Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x", + len, + receivedCmd[0], receivedCmd[1], receivedCmd[2], + receivedCmd[3], receivedCmd[4], receivedCmd[5], + receivedCmd[6], receivedCmd[7], receivedCmd[8]); + // Do not respond + resp = resp1; respLen = 0; //order = 0; + respdata = NULL; + respsize = 0; + } + + if(cmdsRecvd > 999) { + DbpString("1000 commands later..."); + break; + } + else { + cmdsRecvd++; + } + + if(respLen > 0) { + SendIClassAnswer(resp, respLen, 21); + } + + if (tracing) { + LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE); + if (respdata != NULL) { + LogTrace(respdata,respsize, 0, SwapBits(GetParity(respdata,respsize),respsize), FALSE); + } + if(traceLen > TRACE_SIZE) { + DbpString("Trace full"); + break; + } + } + + memset(receivedCmd, 0x44, RECV_CMD_SIZE); + } + + Dbprintf("%x", cmdsRecvd); + LED_A_OFF(); + LED_B_OFF(); +} + +static int SendIClassAnswer(uint8_t *resp, int respLen, int delay) +{ + int i = 0, u = 0, d = 0; + uint8_t b = 0; + // return 0; + // Modulate Manchester + // FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD424); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD); + AT91C_BASE_SSC->SSC_THR = 0x00; + FpgaSetupSsc(); + + // 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; + } + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { + if(d < delay) { + b = 0x00; + d++; + } + else if(i >= respLen) { + b = 0x00; + u++; + } else { + b = resp[i]; + u++; + if(u > 1) { i++; u = 0; } + } + AT91C_BASE_SSC->SSC_THR = b; + + if(u > 4) break; + } + if(BUTTON_PRESS()) { + break; + } + } + + return 0; +} + +/// THE READER CODE + +//----------------------------------------------------------------------------- +// Transmit the command (to the tag) that was placed in ToSend[]. +//----------------------------------------------------------------------------- +static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int *wait) +{ + int c; + + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); + AT91C_BASE_SSC->SSC_THR = 0x00; + FpgaSetupSsc(); + + if (wait) + if(*wait < 10) + *wait = 10; + + for(c = 0; c < *wait;) { + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { + AT91C_BASE_SSC->SSC_THR = 0x00; // For exact timing! + c++; + } + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { + volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; + (void)r; + } + WDT_HIT(); + } + + uint8_t sendbyte; + bool firstpart = TRUE; + c = 0; + for(;;) { + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { + + // DOUBLE THE SAMPLES! + if(firstpart) { + sendbyte = (cmd[c] & 0xf0) | (cmd[c] >> 4); + } + else { + sendbyte = (cmd[c] & 0x0f) | (cmd[c] << 4); + c++; + } + if(sendbyte == 0xff) { + sendbyte = 0xfe; + } + AT91C_BASE_SSC->SSC_THR = sendbyte; + firstpart = !firstpart; + + if(c >= len) { + break; + } + } + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { + volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR; + (void)r; + } + WDT_HIT(); + } + if (samples) *samples = (c + *wait) << 3; +} + + +//----------------------------------------------------------------------------- +// Prepare iClass reader command to send to FPGA +//----------------------------------------------------------------------------- +void CodeIClassCommand(const uint8_t * cmd, int len) +{ + int i, j, k; + uint8_t b; + + ToSendReset(); + + // Start of Communication: 1 out of 4 + ToSend[++ToSendMax] = 0xf0; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0x0f; + ToSend[++ToSendMax] = 0x00; + + // Modulate the bytes + for (i = 0; i < len; i++) { + b = cmd[i]; + for(j = 0; j < 4; j++) { + for(k = 0; k < 4; k++) { + if(k == (b & 3)) { + ToSend[++ToSendMax] = 0x0f; + } + else { + ToSend[++ToSendMax] = 0x00; + } + } + b >>= 2; + } + } + + // End of Communication + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0x00; + ToSend[++ToSendMax] = 0xf0; + ToSend[++ToSendMax] = 0x00; + + // Convert from last character reference to length + ToSendMax++; +} + +void ReaderTransmitIClass(uint8_t* frame, int len) +{ + int wait = 0; + int samples = 0; + int par = 0; + + // This is tied to other size changes + // uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024; + CodeIClassCommand(frame,len); + + // Select the card + TransmitIClassCommand(ToSend, ToSendMax, &samples, &wait); + if(trigger) + LED_A_ON(); + + // Store reader command in buffer + if (tracing) LogTrace(frame,len,0,par,TRUE); +} + +//----------------------------------------------------------------------------- +// Wait a certain time for tag response +// If a response is captured return TRUE +// If it takes too long return FALSE +//----------------------------------------------------------------------------- +static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed) //uint8_t *buffer +{ + // buffer needs to be 512 bytes + int c; + + // Set FPGA mode to "reader listen mode", no modulation (listen + // only, since we are receiving, not transmitting). + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN); + + // Now get the answer from the card + Demod.output = receivedResponse; + Demod.len = 0; + Demod.state = DEMOD_UNSYNCD; + + uint8_t b; + if (elapsed) *elapsed = 0; + + bool skip = FALSE; + + c = 0; + for(;;) { + WDT_HIT(); + + if(BUTTON_PRESS()) return FALSE; + + 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 < timeout) { c++; } else { return FALSE; } + b = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + skip = !skip; + if(skip) continue; + /*if(ManchesterDecoding((b>>4) & 0xf)) { + *samples = ((c - 1) << 3) + 4; + return TRUE; + }*/ + if(ManchesterDecoding(b & 0x0f)) { + *samples = c << 3; + return TRUE; + } + } + } +} + +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); + if(samples == 0) return FALSE; + return Demod.len; +} + +// Reader iClass Anticollission +void ReaderIClass(uint8_t arg0) { + uint8_t act_all[] = { 0x0a }; + uint8_t identify[] = { 0x0c }; + uint8_t select[] = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; + + uint8_t* resp = (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes + + // Reset trace buffer + memset(trace, 0x44, RECV_CMD_OFFSET); + traceLen = 0; + + // Setup SSC + FpgaSetupSsc(); + // Start from off (no field generated) + // Signal field is off with the appropriate LED LED_D_OFF(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + SpinDelay(200); + + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + + // Now give it time to spin up. + // Signal field is on with the appropriate LED + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); + SpinDelay(200); + + LED_A_ON(); + + for(;;) { + + if(traceLen > TRACE_SIZE) { + DbpString("Trace full"); + break; + } + + if (BUTTON_PRESS()) break; + + // Send act_all + ReaderTransmitIClass(act_all, 1); + // Card present? + if(ReaderReceiveIClass(resp)) { + ReaderTransmitIClass(identify, 1); + if(ReaderReceiveIClass(resp) == 10) { + // Select card + memcpy(&select[1],resp,8); + ReaderTransmitIClass(select, sizeof(select)); + + if(ReaderReceiveIClass(resp) == 10) { + Dbprintf(" Selected CSN: %02x %02x %02x %02x %02x %02x %02x %02x", + resp[0], resp[1], resp[2], + resp[3], resp[4], resp[5], + resp[6], resp[7]); + } + // Card selected, whats next... ;-) + } + } + WDT_HIT(); + } + + LED_A_OFF(); } +