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Merge branch 'master' of https://github.com/Proxmark/proxmark3
[proxmark3-svn] / armsrc / iclass.c
diff --git a/armsrc/iclass.c b/armsrc/iclass.c
index 474a336c224c116914fff514430d8a1a0b26cfb9..67130804910a13428772e31189182d3874d1c7af 100644 (file)
--- a/armsrc/iclass.c
+++ b/armsrc/iclass.c
@@ -435,7 +435,7 @@ static RAMFUNC int ManchesterDecoding(int v)
        else {
                modulation = bit & Demod.syncBit;
                modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
        else {
                modulation = bit & Demod.syncBit;
                modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
-       
+
                Demod.samples += 4;
 
                if(Demod.posCount==0) {
                Demod.samples += 4;
 
                if(Demod.posCount==0) {
@@ -642,21 +642,24 @@ void RAMFUNC SnoopIClass(void)
     // The command (reader -> tag) that we're receiving.
        // The length of a received command will in most cases be no more than 18 bytes.
        // So 32 should be enough!
     // The command (reader -> tag) that we're receiving.
        // The length of a received command will in most cases be no more than 18 bytes.
        // So 32 should be enough!
-       uint8_t *readerToTagCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+       #define ICLASS_BUFFER_SIZE 32
+       uint8_t readerToTagCmd[ICLASS_BUFFER_SIZE];
     // The response (tag -> reader) that we're receiving.
     // The response (tag -> reader) that we're receiving.
-       uint8_t *tagToReaderResponse = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
-
+       uint8_t tagToReaderResponse[ICLASS_BUFFER_SIZE];
+       
     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
  
     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
  
-    // reset traceLen to 0
-    iso14a_set_tracing(TRUE);
-    iso14a_clear_trace();
+       // free all BigBuf memory
+       BigBuf_free();
+    // The DMA buffer, used to stream samples from the FPGA
+    uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
+ 
+       set_tracing(TRUE);
+       clear_trace();
     iso14a_set_trigger(FALSE);
 
     iso14a_set_trigger(FALSE);
 
-    // The DMA buffer, used to stream samples from the FPGA
-    int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
     int lastRxCounter;
     int lastRxCounter;
-    int8_t *upTo;
+    uint8_t *upTo;
     int smpl;
     int maxBehindBy = 0;
 
     int smpl;
     int maxBehindBy = 0;
 
@@ -689,7 +692,8 @@ void RAMFUNC SnoopIClass(void)
     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
        uint32_t time_0 = GetCountSspClk();
     SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
        uint32_t time_0 = GetCountSspClk();
-
+       uint32_t time_start = 0;
+       uint32_t time_stop  = 0;
 
     int div = 0;
     //int div2 = 0;
 
     int div = 0;
     //int div2 = 0;
@@ -704,7 +708,7 @@ void RAMFUNC SnoopIClass(void)
                                 (DMA_BUFFER_SIZE-1);
         if(behindBy > maxBehindBy) {
             maxBehindBy = behindBy;
                                 (DMA_BUFFER_SIZE-1);
         if(behindBy > maxBehindBy) {
             maxBehindBy = behindBy;
-            if(behindBy > 400) {
+            if(behindBy > (9 * DMA_BUFFER_SIZE / 10)) {
                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
                 goto done;
             }
                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
                 goto done;
             }
@@ -740,14 +744,15 @@ void RAMFUNC SnoopIClass(void)
                smpl = decbyter;        
                if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
                    rsamples = samples - Uart.samples;
                smpl = decbyter;        
                if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
                    rsamples = samples - Uart.samples;
+                       time_stop = (GetCountSspClk()-time_0) << 4;
                    LED_C_ON();
 
                        //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;
                    LED_C_ON();
 
                        //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) {
+                       if(tracing)     {
                                uint8_t parity[MAX_PARITY_SIZE];
                                GetParity(Uart.output, Uart.byteCnt, parity);
                                uint8_t parity[MAX_PARITY_SIZE];
                                GetParity(Uart.output, Uart.byteCnt, parity);
-                               LogTrace(Uart.output,Uart.byteCnt, (GetCountSspClk()-time_0) << 4, (GetCountSspClk()-time_0) << 4, parity, TRUE);
+                               LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, TRUE);
                        }
 
 
                        }
 
 
@@ -758,6 +763,8 @@ void RAMFUNC SnoopIClass(void)
                    Demod.state = DEMOD_UNSYNCD;
                    LED_B_OFF();
                    Uart.byteCnt = 0;
                    Demod.state = DEMOD_UNSYNCD;
                    LED_B_OFF();
                    Uart.byteCnt = 0;
+               }else{
+                       time_start = (GetCountSspClk()-time_0) << 4;
                }
                decbyter = 0;
        }
                }
                decbyter = 0;
        }
@@ -765,21 +772,24 @@ void RAMFUNC SnoopIClass(void)
        if(div > 3) {
                smpl = decbyte;
                if(ManchesterDecoding(smpl & 0x0F)) {
        if(div > 3) {
                smpl = decbyte;
                if(ManchesterDecoding(smpl & 0x0F)) {
+                       time_stop = (GetCountSspClk()-time_0) << 4;
+
                    rsamples = samples - Demod.samples;
                    LED_B_ON();
 
                    rsamples = samples - Demod.samples;
                    LED_B_ON();
 
-                       if(tracing) {
+                       if(tracing)     {
                                uint8_t parity[MAX_PARITY_SIZE];
                                GetParity(Demod.output, Demod.len, parity);
                                uint8_t parity[MAX_PARITY_SIZE];
                                GetParity(Demod.output, Demod.len, parity);
-                               LogTrace(Demod.output, Demod.len, (GetCountSspClk()-time_0) << 4, (GetCountSspClk()-time_0) << 4, parity, FALSE);
+                               LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, FALSE);
                        }
 
                        }
 
-
                    // And ready to receive another response.
                    memset(&Demod, 0, sizeof(Demod));
                        Demod.output = tagToReaderResponse;
                    Demod.state = DEMOD_UNSYNCD;
                    LED_C_OFF();
                    // And ready to receive another response.
                    memset(&Demod, 0, sizeof(Demod));
                        Demod.output = tagToReaderResponse;
                    Demod.state = DEMOD_UNSYNCD;
                    LED_C_OFF();
+               }else{
+                       time_start = (GetCountSspClk()-time_0) << 4;
                }
                
                div = 0;
                }
                
                div = 0;
@@ -796,12 +806,12 @@ void RAMFUNC SnoopIClass(void)
     DbpString("COMMAND FINISHED");
 
     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
     DbpString("COMMAND FINISHED");
 
     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
-    Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+       Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
 
 done:
     AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 
 done:
     AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
-    Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+       Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
     LED_A_OFF();
     LED_B_OFF();
     LED_C_OFF();
     LED_A_OFF();
     LED_B_OFF();
     LED_C_OFF();
@@ -852,57 +862,93 @@ static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
     }
 }
 
     }
 }
 
+static uint8_t encode4Bits(const uint8_t b)
+{
+       uint8_t c = b & 0xF;
+       // OTA, the least significant bits first
+       //         The columns are
+       //               1 - Bit value to send
+       //               2 - Reversed (big-endian)
+       //               3 - Encoded
+       //               4 - Hex values
+
+       switch(c){
+       //                          1       2         3         4
+         case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55
+         case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95
+         case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65
+         case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5
+         case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59
+         case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99
+         case 9:  return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69
+         case 8:  return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9
+         case 7:  return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56
+         case 6:  return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96
+         case 5:  return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66
+         case 4:  return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6
+         case 3:  return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a
+         case 2:  return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a
+         case 1:  return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a
+         default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa
+
+       }
+}
 
 //-----------------------------------------------------------------------------
 // Prepare tag messages
 //-----------------------------------------------------------------------------
 static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 {
 
 //-----------------------------------------------------------------------------
 // Prepare tag messages
 //-----------------------------------------------------------------------------
 static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 {
-       //So far a dummy implementation, not used
-       //int lastProxToAirDuration =0;
+
+       /*
+        * SOF comprises 3 parts;
+        * * An unmodulated time of 56.64 us
+        * * 24 pulses of 423.75 KHz (fc/32)
+        * * A logic 1, which starts with an unmodulated time of 18.88us
+        *   followed by 8 pulses of 423.75kHz (fc/32)
+        *
+        *
+        * EOF comprises 3 parts:
+        * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated
+        *   time of 18.88us.
+        * - 24 pulses of fc/32
+        * - An unmodulated time of 56.64 us
+        *
+        *
+        * A logic 0 starts with 8 pulses of fc/32
+        * followed by an unmodulated time of 256/fc (~18,88us).
+        *
+        * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by
+        * 8 pulses of fc/32 (also 18.88us)
+        *
+        * The mode FPGA_HF_SIMULATOR_MODULATE_424K_8BIT which we use to simulate tag,
+        * works like this.
+        * - A 1-bit input to the FPGA becomes 8 pulses on 423.5kHz (fc/32) (18.88us).
+        * - A 0-bit inptu to the FPGA becomes an unmodulated time of 18.88us
+        *
+        * In this mode the SOF can be written as 00011101 = 0x1D
+        * The EOF can be written as 10111000 = 0xb8
+        * A logic 1 is 01
+        * A logic 0 is 10
+        *
+        * */
+
        int i;
 
        ToSendReset();
 
        // Send SOF
        int i;
 
        ToSendReset();
 
        // Send SOF
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0xff;//Proxtoair duration starts here
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0xff;
-       ToSend[++ToSendMax] = 0x00;
-       ToSend[++ToSendMax] = 0xff;
+       ToSend[++ToSendMax] = 0x1D;
 
        for(i = 0; i < len; i++) {
 
        for(i = 0; i < len; i++) {
-               int j;
                uint8_t b = cmd[i];
                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;
+               ToSend[++ToSendMax] = encode4Bits(b & 0xF); //Least significant half
+               ToSend[++ToSendMax] = encode4Bits((b >>4) & 0xF);//Most significant half
                        }
                        }
-                       b >>= 1;
-               }
-       }
 
        // Send EOF
 
        // 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;
-
+       ToSend[++ToSendMax] = 0xB8;
        //lastProxToAirDuration  = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end
        //lastProxToAirDuration  = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end
-
        // Convert from last byte pos to length
        ToSendMax++;
 }
        // Convert from last byte pos to length
        ToSendMax++;
 }
@@ -915,21 +961,13 @@ static void CodeIClassTagSOF()
 
        ToSendReset();
        // Send SOF
 
        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;
-
+       ToSend[++ToSendMax] = 0x1D;
 //     lastProxToAirDuration  = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
 
 //     lastProxToAirDuration  = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
 
-       
        // Convert from last byte pos to length
        ToSendMax++;
 }
        // Convert from last byte pos to length
        ToSendMax++;
 }
+
 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf);
 /**
  * @brief SimulateIClass simulates an iClass card.
 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf);
 /**
  * @brief SimulateIClass simulates an iClass card.
@@ -950,8 +988,8 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 
        // Enable and clear the trace
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 
        // Enable and clear the trace
-       iso14a_set_tracing(TRUE);
-       iso14a_clear_trace();
+       set_tracing(TRUE);
+       clear_trace();
 
        uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
        if(simType == 0) {
 
        uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
        if(simType == 0) {
@@ -965,7 +1003,7 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
        else if(simType == 2)
        {
 
        else if(simType == 2)
        {
 
-               uint8_t mac_responses[64] = { 0 };
+               uint8_t mac_responses[USB_CMD_DATA_SIZE] = { 0 };
                Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);
                // In this mode, a number of csns are within datain. We'll simulate each one, one at a time
                // in order to collect MAC's from the reader. This can later be used in an offlne-attack
                Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);
                // In this mode, a number of csns are within datain. We'll simulate each one, one at a time
                // in order to collect MAC's from the reader. This can later be used in an offlne-attack
@@ -978,6 +1016,7 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
                        memcpy(csn_crc, datain+(i*8), 8);
                        if(doIClassSimulation(csn_crc,1,mac_responses+i*8))
                        {
                        memcpy(csn_crc, datain+(i*8), 8);
                        if(doIClassSimulation(csn_crc,1,mac_responses+i*8))
                        {
+                               cmd_send(CMD_ACK,CMD_SIMULATE_TAG_ICLASS,i,0,mac_responses,i*8);
                                return; // Button pressed
                        }
                }
                                return; // Button pressed
                        }
                }
@@ -999,7 +1038,9 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
  */
 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf)
 {
  */
 int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader_mac_buf)
 {
+
        // CSN followed by two CRC bytes
        // CSN followed by two CRC bytes
+       uint8_t response1[] = { 0x0F} ;
        uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
        memcpy(response3,csn,sizeof(response3));
        uint8_t response2[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        uint8_t response3[] = { 0,0,0,0,0,0,0,0,0,0};
        memcpy(response3,csn,sizeof(response3));
@@ -1022,33 +1063,34 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
        // Reader 81 anticoll. CSN
        // Tag    CSN
 
        // Reader 81 anticoll. CSN
        // Tag    CSN
 
-       uint8_t *resp;
-       int respLen;
-       uint8_t* respdata = NULL;
-       int respsize = 0;
-       uint8_t sof = 0x0f;
+       uint8_t *modulated_response;
+       int modulated_response_size;
+       uint8_t* trace_data = NULL;
+       int trace_data_size = 0;
+       //uint8_t sof = 0x0f;
 
 
-       // Respond SOF -- takes 8 bytes
-       uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
+       // free eventually allocated BigBuf memory
+       BigBuf_free();
+       // Respond SOF -- takes 1 bytes
+       uint8_t *resp1 = BigBuf_malloc(2);
        int resp1Len;
 
        // Anticollision CSN (rotated CSN)
        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);
+       // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
+       uint8_t *resp2 = BigBuf_malloc(28);
        int resp2Len;
 
        // CSN
        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);
+       // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
+       uint8_t *resp3 = BigBuf_malloc(30);
        int resp3Len;
 
        // e-Purse
        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);
+       // 18: Takes 2 bytes for SOF/EOF and 8 * 2 = 16 bytes (2 bytes/bit)
+       uint8_t *resp4 = BigBuf_malloc(20);
        int resp4Len;
 
        int resp4Len;
 
-       // + 1720..
-       uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+       uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
        memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
        int len;
 
        memset(receivedCmd, 0x44, MAX_FRAME_SIZE);
        int len;
 
@@ -1091,11 +1133,6 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
        LED_A_ON();
        bool buttonPressed = false;
 
        LED_A_ON();
        bool buttonPressed = false;
 
-       /** Hack  for testing
-       memcpy(reader_mac_buf,csn,8);
-       exitLoop = true;
-       end hack **/
-
        while(!exitLoop) {
 
                LED_B_OFF();
        while(!exitLoop) {
 
                LED_B_OFF();
@@ -1114,35 +1151,35 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
                // Okay, look at the command now.
                if(receivedCmd[0] == 0x0a ) {
                        // Reader in anticollission phase
                // 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);
+                       modulated_response = resp1; modulated_response_size = resp1Len; //order = 1;
+                       trace_data = response1;
+                       trace_data_size = sizeof(response1);
                } else if(receivedCmd[0] == 0x0c) {
                        // Reader asks for anticollission CSN
                } else if(receivedCmd[0] == 0x0c) {
                        // Reader asks for anticollission CSN
-                       resp = resp2; respLen = resp2Len; //order = 2;
-                       respdata = response2;
-                       respsize = sizeof(response2);
+                       modulated_response = resp2; modulated_response_size = resp2Len; //order = 2;
+                       trace_data = response2;
+                       trace_data_size = sizeof(response2);
                        //DbpString("Reader requests anticollission CSN:");
                } else if(receivedCmd[0] == 0x81) {
                        // Reader selects anticollission CSN.
                        // Tag sends the corresponding real CSN
                        //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);
+                       modulated_response = resp3; modulated_response_size = resp3Len; //order = 3;
+                       trace_data = response3;
+                       trace_data_size = sizeof(response3);
                        //DbpString("Reader selects anticollission CSN:");
                } else if(receivedCmd[0] == 0x88) {
                        // Read e-purse (88 02)
                        //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);
+                       modulated_response = resp4; modulated_response_size = resp4Len; //order = 4;
+                       trace_data = response4;
+                       trace_data_size = sizeof(response4);
                        LED_B_ON();
                } else if(receivedCmd[0] == 0x05) {
                        // Reader random and reader MAC!!!
                        // Do not respond
             // We do not know what to answer, so lets keep quiet
                        LED_B_ON();
                } else if(receivedCmd[0] == 0x05) {
                        // Reader random and reader MAC!!!
                        // Do not respond
             // We do not know what to answer, so lets keep quiet
-                       resp = resp1; respLen = 0; //order = 5;
-                       respdata = NULL;
-                       respsize = 0;
+                       modulated_response = resp1; modulated_response_size = 0; //order = 5;
+                       trace_data = NULL;
+                       trace_data_size = 0;
                        if (breakAfterMacReceived){
                                // dbprintf:ing ...
                                Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x"
                        if (breakAfterMacReceived){
                                // dbprintf:ing ...
                                Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x"
@@ -1159,9 +1196,9 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
                        }
                } else if(receivedCmd[0] == 0x00 && len == 1) {
                        // Reader ends the session
                        }
                } else if(receivedCmd[0] == 0x00 && len == 1) {
                        // Reader ends the session
-                       resp = resp1; respLen = 0; //order = 0;
-                       respdata = NULL;
-                       respsize = 0;
+                       modulated_response = resp1; modulated_response_size = 0; //order = 0;
+                       trace_data = NULL;
+                       trace_data_size = 0;
                } else {
                        //#db# Unknown command received from reader (len=5): 26 1 0 f6 a 44 44 44 44
                        // Never seen this command before
                } else {
                        //#db# Unknown command received from reader (len=5): 26 1 0 f6 a 44 44 44 44
                        // Never seen this command before
@@ -1171,9 +1208,9 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
                        receivedCmd[3], receivedCmd[4], receivedCmd[5],
                        receivedCmd[6], receivedCmd[7], receivedCmd[8]);
                        // Do not respond
                        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;
+                       modulated_response = resp1; modulated_response_size = 0; //order = 0;
+                       trace_data = NULL;
+                       trace_data_size = 0;
                }
 
                if(cmdsRecvd >  100) {
                }
 
                if(cmdsRecvd >  100) {
@@ -1183,9 +1220,11 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
                else {
                        cmdsRecvd++;
                }
                else {
                        cmdsRecvd++;
                }
-
-               if(respLen > 0) {
-                       SendIClassAnswer(resp, respLen, 21);
+               /**
+               A legit tag has about 380us delay between reader EOT and tag SOF.
+               **/
+               if(modulated_response_size > 0) {
+                       SendIClassAnswer(modulated_response, modulated_response_size, 1);
                        t2r_time = GetCountSspClk();
                }
 
                        t2r_time = GetCountSspClk();
                }
 
@@ -1194,9 +1233,9 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
                        GetParity(receivedCmd, len, parity);
                        LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);
 
                        GetParity(receivedCmd, len, parity);
                        LogTrace(receivedCmd,len, (r2t_time-time_0)<< 4, (r2t_time-time_0) << 4, parity, TRUE);
 
-                       if (respdata != NULL) {
-                               GetParity(respdata, respsize, parity);
-                               LogTrace(respdata, respsize, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
+                       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");
                        }
                        if(!tracing) {
                                DbpString("Trace full");
@@ -1210,6 +1249,8 @@ int doIClassSimulation(uint8_t csn[], int breakAfterMacReceived, uint8_t *reader
        //Dbprintf("%x", cmdsRecvd);
        LED_A_OFF();
        LED_B_OFF();
        //Dbprintf("%x", cmdsRecvd);
        LED_A_OFF();
        LED_B_OFF();
+       LED_C_OFF();
+
        if(buttonPressed)
        {
                DbpString("Button pressed");
        if(buttonPressed)
        {
                DbpString("Button pressed");
@@ -1222,7 +1263,8 @@ static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
        int i = 0, d=0;//, u = 0, d = 0;
        uint8_t b = 0;
 
        int i = 0, d=0;//, u = 0, d = 0;
        uint8_t b = 0;
 
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
+       //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K_8BIT);
 
        AT91C_BASE_SSC->SSC_THR = 0x00;
        FpgaSetupSsc();
 
        AT91C_BASE_SSC->SSC_THR = 0x00;
        FpgaSetupSsc();
@@ -1246,7 +1288,8 @@ static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
                        AT91C_BASE_SSC->SSC_THR = b;
                }
 
                        AT91C_BASE_SSC->SSC_THR = b;
                }
 
-               if (i > respLen +4) break;
+//             if (i > respLen +4) break;
+               if (i > respLen +1) break;
        }
 
        return 0;
        }
 
        return 0;
@@ -1267,7 +1310,7 @@ static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int
    if (wait)
    {
      if(*wait < 10) *wait = 10;
    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!
   for(c = 0; c < *wait;) {
     if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
       AT91C_BASE_SSC->SSC_THR = 0x00;          // For exact timing!
@@ -1373,7 +1416,7 @@ void ReaderTransmitIClass(uint8_t* frame, int len)
        LED_A_ON();
 
   // Store reader command in buffer
        LED_A_ON();
 
   // Store reader command in buffer
-  if (tracing) {
+       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);
@@ -1433,10 +1476,10 @@ int ReaderReceiveIClass(uint8_t* receivedAnswer)
   int samples = 0;
   if (!GetIClassAnswer(receivedAnswer,160,&samples,0)) return FALSE;
   rsamples += samples;
   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);
+  if (tracing) {
+       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;
   }
   if(samples == 0) return FALSE;
   return Demod.len;
@@ -1446,8 +1489,8 @@ void setupIclassReader()
 {
     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
     // Reset trace buffer
 {
     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
     // Reset trace buffer
-    iso14a_set_tracing(TRUE);
-    iso14a_clear_trace();
+       set_tracing(TRUE);
+       clear_trace();
 
     // Setup SSC
     FpgaSetupSsc();
 
     // Setup SSC
     FpgaSetupSsc();
@@ -1492,7 +1535,7 @@ uint8_t handshakeIclassTag(uint8_t *card_data)
        static uint8_t identify[]    = { 0x0c };
        static uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        static uint8_t readcheck_cc[]= { 0x88, 0x02 };
        static uint8_t identify[]    = { 0x0c };
        static uint8_t select[]      = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        static uint8_t readcheck_cc[]= { 0x88, 0x02 };
-       uint8_t *resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+       uint8_t resp[ICLASS_BUFFER_SIZE];
 
        uint8_t read_status = 0;
 
 
        uint8_t read_status = 0;
 
@@ -1539,22 +1582,22 @@ void ReaderIClass(uint8_t arg0) {
 
     uint8_t card_data[24]={0};
     uint8_t last_csn[8]={0};
 
     uint8_t card_data[24]={0};
     uint8_t last_csn[8]={0};
-
+       
     int read_status= 0;
     bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;
        bool get_cc = arg0 & FLAG_ICLASS_READER_GET_CC;
     int read_status= 0;
     bool abort_after_read = arg0 & FLAG_ICLASS_READER_ONLY_ONCE;
        bool get_cc = arg0 & FLAG_ICLASS_READER_GET_CC;
-
+       set_tracing(TRUE);
     setupIclassReader();
 
     size_t datasize = 0;
     while(!BUTTON_PRESS())
     {
 
     setupIclassReader();
 
     size_t datasize = 0;
     while(!BUTTON_PRESS())
     {
 
-               if(traceLen > TRACE_SIZE) {
+               if(!tracing) {
                        DbpString("Trace full");
                        break;
                }
                        DbpString("Trace full");
                        break;
                }
-        WDT_HIT();
+               WDT_HIT();
 
                read_status = handshakeIclassTag(card_data);
 
 
                read_status = handshakeIclassTag(card_data);
 
@@ -1579,7 +1622,7 @@ void ReaderIClass(uint8_t arg0) {
                        }
                        //If 'get_cc' was specified and we didn't get a CC, we'll just keep trying...
                }
                        }
                        //If 'get_cc' was specified and we didn't get a CC, we'll just keep trying...
                }
-                    LED_B_OFF();
+               LED_B_OFF();
     }
     cmd_send(CMD_ACK,0,0,0,card_data, 0);
     LED_A_OFF();
     }
     cmd_send(CMD_ACK,0,0,0,card_data, 0);
     LED_A_OFF();
@@ -1587,7 +1630,7 @@ void ReaderIClass(uint8_t arg0) {
 
 void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
 
 
 void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
 
-       uint8_t card_data[24]={0};
+       uint8_t card_data[USB_CMD_DATA_SIZE]={0};
        uint16_t block_crc_LUT[255] = {0};
 
        {//Generate a lookup table for block crc
        uint16_t block_crc_LUT[255] = {0};
 
        {//Generate a lookup table for block crc
@@ -1613,16 +1656,16 @@ void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
          int keyaccess;
        } memory;
        
          int keyaccess;
        } memory;
        
-       uint8_t* resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
-
+       uint8_t resp[ICLASS_BUFFER_SIZE];
+       
     setupIclassReader();
     setupIclassReader();
-
+       set_tracing(TRUE);
 
        while(!BUTTON_PRESS()) {
        
                WDT_HIT();
 
        while(!BUTTON_PRESS()) {
        
                WDT_HIT();
-       
-               if(traceLen > TRACE_SIZE) {
+
+               if(!tracing) {
                        DbpString("Trace full");
                        break;
                }
                        DbpString("Trace full");
                        break;
                }
@@ -1660,7 +1703,10 @@ void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
 
                cardsize = memory.k16 ? 255 : 32;
                WDT_HIT();
 
                cardsize = memory.k16 ? 255 : 32;
                WDT_HIT();
-
+               //Set card_data to all zeroes, we'll fill it with data
+               memset(card_data,0x0,USB_CMD_DATA_SIZE);
+               uint8_t failedRead =0;
+               uint8_t stored_data_length =0;
                                //then loop around remaining blocks
                for(int block=0; block < cardsize; block++){
 
                                //then loop around remaining blocks
                for(int block=0; block < cardsize; block++){
 
@@ -1676,14 +1722,47 @@ void ReaderIClass_Replay(uint8_t arg0, uint8_t *MAC) {
                                          resp[3], resp[4], resp[5],
                                          resp[6], resp[7]);
 
                                          resp[3], resp[4], resp[5],
                                          resp[6], resp[7]);
 
+                               //Fill up the buffer
+                               memcpy(card_data+stored_data_length,resp,8);
+                               stored_data_length += 8;
+
+                               if(stored_data_length +8 > USB_CMD_DATA_SIZE)
+                               {//Time to send this off and start afresh
+                                       cmd_send(CMD_ACK,
+                                                        stored_data_length,//data length
+                                                        failedRead,//Failed blocks?
+                                                        0,//Not used ATM
+                                                        card_data, stored_data_length);
+                                       //reset
+                                       stored_data_length = 0;
+                                       failedRead = 0;
+                               }
+
                        }else{
                        }else{
+                               failedRead = 1;
+                               stored_data_length +=8;//Otherwise, data becomes misaligned
                                Dbprintf("Failed to dump block %d", block);
                                Dbprintf("Failed to dump block %d", block);
-
                        }
                }
                        }
                }
+               //Send off any remaining data
+               if(stored_data_length > 0)
+               {
+                       cmd_send(CMD_ACK,
+                                        stored_data_length,//data length
+                                        failedRead,//Failed blocks?
+                                        0,//Not used ATM
+                                        card_data, stored_data_length);
+               }
                //If we got here, let's break
                break;
        }
                //If we got here, let's break
                break;
        }
+       //Signal end of transmission
+       cmd_send(CMD_ACK,
+                        0,//data length
+                        0,//Failed blocks?
+                        0,//Not used ATM
+                        card_data, 0);
+
        LED_A_OFF();
 }
 
        LED_A_OFF();
 }
 
@@ -1702,7 +1781,7 @@ void IClass_iso14443A_write(uint8_t arg0, uint8_t blockNo, uint8_t *data, uint8_
        
     uint16_t crc = 0;
        
        
     uint16_t crc = 0;
        
-       uint8_t* resp = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
+       uint8_t* resp = (((uint8_t *)BigBuf) + 3560);
 
        // Reset trace buffer
        memset(trace, 0x44, RECV_CMD_OFFSET);
 
        // Reset trace buffer
        memset(trace, 0x44, RECV_CMD_OFFSET);
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