Changes to html-dump generateion, credits to en4rab http://www.proxmark.org/forum...

[proxmark3-svn] / armsrc / iso14443a.c

diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index ce8467bfe37ed1bf78d7136a03002a90360eb03f..63cc32aecf9761a29836139dcd9bc42603789fda 100644 (file)
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -1,5 +1,5 @@
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------

-// Merlok - June 2011
+// Merlok - June 2011, 2012

 // Gerhard de Koning Gans - May 2008
 // Hagen Fritsch - June 2010
 //
 // Gerhard de Koning Gans - May 2008
 // Hagen Fritsch - June 2010
 //


@@ -14,17 +14,21 @@
 #include "apps.h"
 #include "util.h"
 #include "string.h"
 #include "apps.h"
 #include "util.h"
 #include "string.h"

+#include "cmd.h"

 
 #include "iso14443crc.h"
 #include "iso14443a.h"
 #include "crapto1.h"
 #include "mifareutil.h"
 
 
 #include "iso14443crc.h"
 #include "iso14443a.h"
 #include "crapto1.h"
 #include "mifareutil.h"
 

-static uint8_t *trace = (uint8_t *) BigBuf;
-static int traceLen = 0;
-static int rsamples = 0;
-static int tracing = TRUE;

 static uint32_t iso14a_timeout;
 static uint32_t iso14a_timeout;

+uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET;
+int traceLen = 0;
+int rsamples = 0;
+int tracing = TRUE;
+uint8_t trigger = 0;
+// the block number for the ISO14443-4 PCB
+static uint8_t iso14_pcb_blocknum = 0;

 
 // CARD TO READER - manchester
 // Sequence D: 11110000 modulation with subcarrier during first half
 
 // CARD TO READER - manchester
 // Sequence D: 11110000 modulation with subcarrier during first half


@@ -41,7 +45,7 @@ static uint32_t iso14a_timeout;
 #define        SEC_Y 0x00
 #define        SEC_Z 0xc0
 
 #define        SEC_Y 0x00
 #define        SEC_Z 0xc0
 

-static const uint8_t OddByteParity[256] = {
+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,
   0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,


@@ -60,42 +64,56 @@ static const uint8_t OddByteParity[256] = {
   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
 };
 

-uint8_t trigger = 0;
-void iso14a_set_trigger(int enable) {
+
+void iso14a_set_trigger(bool enable) {

        trigger = enable;
 }
 
        trigger = enable;
 }
 

+void iso14a_clear_trace() {
+  memset(trace, 0x44, TRACE_SIZE);
+       traceLen = 0;
+}
+
+void iso14a_set_tracing(bool enable) {
+       tracing = enable;
+}
+
+void iso14a_set_timeout(uint32_t timeout) {
+       iso14a_timeout = timeout;
+}
+

 //-----------------------------------------------------------------------------
 // Generate the parity value for a byte sequence
 //
 //-----------------------------------------------------------------------------
 byte_t oddparity (const byte_t bt)
 {
 //-----------------------------------------------------------------------------
 // Generate the parity value for a byte sequence
 //
 //-----------------------------------------------------------------------------
 byte_t oddparity (const byte_t bt)
 {

-  return OddByteParity[bt];
+       return OddByteParity[bt];

 }
 
 uint32_t GetParity(const uint8_t * pbtCmd, int iLen)
 {
 }
 
 uint32_t GetParity(const uint8_t * pbtCmd, int iLen)
 {

-  int i;
-  uint32_t dwPar = 0;
+       int i;
+       uint32_t dwPar = 0;

 
 

-  // Generate the encrypted data
-  for (i = 0; i < iLen; i++) {
-    // Save the encrypted parity bit
-    dwPar |= ((OddByteParity[pbtCmd[i]]) << i);
-  }
-  return dwPar;
+       // Generate the encrypted data
+       for (i = 0; i < iLen; i++) {
+               // Save the encrypted parity bit
+               dwPar |= ((OddByteParity[pbtCmd[i]]) << i);
+       }
+       return dwPar;

 }
 
 void AppendCrc14443a(uint8_t* data, int len)
 {
 }
 
 void AppendCrc14443a(uint8_t* data, int len)
 {

-  ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1);
+       ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1);

 }
 
 }
 

-int LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader)
+// The function LogTrace() is also used by the iClass implementation in iClass.c
+int RAMFUNC LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader)

 {
   // Return when trace is full
 {
   // Return when trace is full

-  if (traceLen >= TRACE_LENGTH) return FALSE;
+  if (traceLen >= TRACE_SIZE) return FALSE;

 
   // Trace the random, i'm curious
   rsamples += iSamples;
 
   // Trace the random, i'm curious
   rsamples += iSamples;


@@ -120,36 +138,11 @@ int LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity,
 // The software UART that receives commands from the reader, and its state
 // variables.
 //-----------------------------------------------------------------------------
 // The software UART that receives commands from the reader, and its state
 // variables.
 //-----------------------------------------------------------------------------

-static struct {
-    enum {
-        STATE_UNSYNCD,
-        STATE_START_OF_COMMUNICATION,
-               STATE_MILLER_X,
-               STATE_MILLER_Y,
-               STATE_MILLER_Z,
-        STATE_ERROR_WAIT
-    }       state;
-    uint16_t    shiftReg;
-    int     bitCnt;
-    int     byteCnt;
-    int     byteCntMax;
-    int     posCnt;
-    int     syncBit;
-       int     parityBits;
-       int     samples;
-    int     highCnt;
-    int     bitBuffer;
-       enum {
-               DROP_NONE,
-               DROP_FIRST_HALF,
-               DROP_SECOND_HALF
-       }               drop;
-    uint8_t   *output;
-} Uart;
+static tUart Uart;

 
 static RAMFUNC int MillerDecoding(int bit)
 {
 
 static RAMFUNC int MillerDecoding(int bit)
 {

-       int error = 0;
+       //int error = 0;

        int bitright;
 
        if(!Uart.bitBuffer) {
        int bitright;
 
        if(!Uart.bitBuffer) {


@@ -195,7 +188,7 @@ static RAMFUNC int MillerDecoding(int bit)
                                // measured a drop in first and second half
                                // which should not be possible
                                Uart.state = STATE_ERROR_WAIT;
                                // measured a drop in first and second half
                                // which should not be possible
                                Uart.state = STATE_ERROR_WAIT;

-                               error = 0x01;
+                               //error = 0x01;

                        }
 
                        Uart.posCnt = 0;
                        }
 
                        Uart.posCnt = 0;


@@ -206,7 +199,7 @@ static RAMFUNC int MillerDecoding(int bit)
                                        if(Uart.drop == DROP_SECOND_HALF) {
                                                // error, should not happen in SOC
                                                Uart.state = STATE_ERROR_WAIT;
                                        if(Uart.drop == DROP_SECOND_HALF) {
                                                // error, should not happen in SOC
                                                Uart.state = STATE_ERROR_WAIT;

-                                               error = 0x02;
+                                               //error = 0x02;

                                        }
                                        else {
                                                // correct SOC
                                        }
                                        else {
                                                // correct SOC


@@ -244,7 +237,7 @@ static RAMFUNC int MillerDecoding(int bit)
                                                // Would be STATE_MILLER_Z
                                                // but Z does not follow X, so error
                                                Uart.state = STATE_ERROR_WAIT;
                                                // Would be STATE_MILLER_Z
                                                // but Z does not follow X, so error
                                                Uart.state = STATE_ERROR_WAIT;

-                                               error = 0x03;
+                                               //error = 0x03;

                                        }
                                        if(Uart.drop == DROP_SECOND_HALF) {
                                                // We see a '1' and stay in state X
                                        }
                                        if(Uart.drop == DROP_SECOND_HALF) {
                                                // We see a '1' and stay in state X


@@ -365,7 +358,7 @@ static RAMFUNC int MillerDecoding(int bit)
                                Uart.bitCnt = 0;
                                Uart.byteCnt = 0;
                                Uart.parityBits = 0;
                                Uart.bitCnt = 0;
                                Uart.byteCnt = 0;
                                Uart.parityBits = 0;

-                               error = 0;
+                               //error = 0;

                        }
                        else {
                                Uart.highCnt = 0;
                        }
                        else {
                                Uart.highCnt = 0;


@@ -384,38 +377,13 @@ static RAMFUNC int MillerDecoding(int bit)
 //=============================================================================
 // ISO 14443 Type A - Manchester
 //=============================================================================
 //=============================================================================
 // ISO 14443 Type A - Manchester
 //=============================================================================

-
-static struct {
-    enum {
-        DEMOD_UNSYNCD,
-               DEMOD_START_OF_COMMUNICATION,
-               DEMOD_MANCHESTER_D,
-               DEMOD_MANCHESTER_E,
-               DEMOD_MANCHESTER_F,
-        DEMOD_ERROR_WAIT
-    }       state;
-    int     bitCount;
-    int     posCount;
-       int     syncBit;
-       int     parityBits;
-    uint16_t    shiftReg;
-       int     buffer;
-       int     buff;
-       int     samples;
-    int     len;
-       enum {
-               SUB_NONE,
-               SUB_FIRST_HALF,
-               SUB_SECOND_HALF
-       }               sub;
-    uint8_t   *output;
-} Demod;
+static tDemod Demod;

 
 static RAMFUNC int ManchesterDecoding(int v)
 {
        int bit;
        int modulation;
 
 static RAMFUNC int ManchesterDecoding(int v)
 {
        int bit;
        int modulation;

-       int error = 0;
+       //int error = 0;

 
        if(!Demod.buff) {
                Demod.buff = 1;
 
        if(!Demod.buff) {
                Demod.buff = 1;


@@ -472,7 +440,7 @@ static RAMFUNC int ManchesterDecoding(int v)
                                        case 0x01: Demod.samples = 0; break;
                                }
                        }
                                        case 0x01: Demod.samples = 0; break;
                                }
                        }

-                       error = 0;
+                       //error = 0;

                }
        }
        else {
                }
        }
        else {


@@ -496,7 +464,7 @@ static RAMFUNC int ManchesterDecoding(int v)
                                if(Demod.state!=DEMOD_ERROR_WAIT) {
                                        Demod.state = DEMOD_ERROR_WAIT;
                                        Demod.output[Demod.len] = 0xaa;
                                if(Demod.state!=DEMOD_ERROR_WAIT) {
                                        Demod.state = DEMOD_ERROR_WAIT;
                                        Demod.output[Demod.len] = 0xaa;

-                                       error = 0x01;
+                                       //error = 0x01;

                                }
                        }
                        else if(modulation) {
                                }
                        }
                        else if(modulation) {


@@ -511,7 +479,7 @@ static RAMFUNC int ManchesterDecoding(int v)
                                        else {
                                                Demod.output[Demod.len] = 0xab;
                                                Demod.state = DEMOD_ERROR_WAIT;
                                        else {
                                                Demod.output[Demod.len] = 0xab;
                                                Demod.state = DEMOD_ERROR_WAIT;

-                                               error = 0x02;
+                                               //error = 0x02;

                                        }
                                        break;
 
                                        }
                                        break;
 


@@ -549,7 +517,7 @@ static RAMFUNC int ManchesterDecoding(int v)
                                        else {
                                                Demod.output[Demod.len] = 0xad;
                                                Demod.state = DEMOD_ERROR_WAIT;
                                        else {
                                                Demod.output[Demod.len] = 0xad;
                                                Demod.state = DEMOD_ERROR_WAIT;

-                                               error = 0x03;
+                                               //error = 0x03;

                                        }
                                        break;
 
                                        }
                                        break;
 


@@ -609,169 +577,147 @@ static RAMFUNC int ManchesterDecoding(int v)
 // triggering so that we start recording at the point that the tag is moved
 // near the reader.
 //-----------------------------------------------------------------------------
 // triggering so that we start recording at the point that the tag is moved
 // near the reader.
 //-----------------------------------------------------------------------------

-void RAMFUNC SnoopIso14443a(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
-
-    // 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
-
-    // The command (reader -> tag) that we're receiving.
+void RAMFUNC SnoopIso14443a(uint8_t param) {
+       // param:
+       // bit 0 - trigger from first card answer
+       // bit 1 - trigger from first reader 7-bit request
+       
+       LEDsoff();
+       // init trace buffer
+       iso14a_clear_trace();
+
+       // 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.
+       // triggered == FALSE -- to wait first for card
+       int triggered = !(param & 0x03); 
+
+       // The command (reader -> tag) that we're receiving.

        // The length of a received command will in most cases be no more than 18 bytes.
        // So 32 should be enough!
        // The length of a received command will in most cases be no more than 18 bytes.
        // So 32 should be enough!

-    uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
-    // The response (tag -> reader) that we're receiving.
-    uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
+       uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+       // The response (tag -> reader) that we're receiving.
+       uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);

 
 

-    // As we receive stuff, we copy it from receivedCmd or receivedResponse
-    // into trace, along with its length and other annotations.
-    //uint8_t *trace = (uint8_t *)BigBuf;
-    
-    traceLen = 0; // uncommented to fix ISSUE 15 - gerhard - jan2011
-
-    // The DMA buffer, used to stream samples from the FPGA
-    int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
-    int lastRxCounter;
-    int8_t *upTo;
-    int smpl;
-    int maxBehindBy = 0;
-
-    // Count of samples received so far, so that we can include timing
-    // information in the trace buffer.
-    int samples = 0;
-    int rsamples = 0;
-
-    memset(trace, 0x44, RECV_CMD_OFFSET);
-
-    // Set up the demodulator for tag -> reader responses.
-    Demod.output = receivedResponse;
-    Demod.len = 0;
-    Demod.state = DEMOD_UNSYNCD;
-
-    // Setup for the DMA.
-    FpgaSetupSsc();
-    upTo = dmaBuf;
-    lastRxCounter = DMA_BUFFER_SIZE;
-    FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
-
-    // And the reader -> tag commands
-    memset(&Uart, 0, sizeof(Uart));
-    Uart.output = receivedCmd;
-    Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////
-    Uart.state = STATE_UNSYNCD;
+       // As we receive stuff, we copy it from receivedCmd or receivedResponse
+       // into trace, along with its length and other annotations.
+       //uint8_t *trace = (uint8_t *)BigBuf;
+       
+       // The DMA buffer, used to stream samples from the FPGA
+       int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
+       int8_t *data = dmaBuf;
+       int maxDataLen = 0;
+       int dataLen = 0;

 
 

-    // And put the FPGA in the appropriate mode
-    // Signal field is off with the appropriate LED
-    LED_D_OFF();
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
-    SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+       // Set up the demodulator for tag -> reader responses.
+       Demod.output = receivedResponse;
+       Demod.len = 0;
+       Demod.state = DEMOD_UNSYNCD;

 
 

+       // Set up the demodulator for the reader -> tag commands
+       memset(&Uart, 0, sizeof(Uart));
+       Uart.output = receivedCmd;
+       Uart.byteCntMax = 32;                        // was 100 (greg)//////////////////
+       Uart.state = STATE_UNSYNCD;

 
 

-    // And now we loop, receiving samples.
-    for(;;) {
-        LED_A_ON();
-        WDT_HIT();
-        int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
-                                (DMA_BUFFER_SIZE-1);
-        if(behindBy > maxBehindBy) {
-            maxBehindBy = behindBy;
-            if(behindBy > 400) {
-                Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
-                goto done;
-            }
-        }
-        if(behindBy < 1) continue;
+       // Setup for the DMA.
+       FpgaSetupSsc();
+       FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);

 
 

-       LED_A_OFF();
-        smpl = upTo[0];
-        upTo++;
-        lastRxCounter -= 1;
-        if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
-            upTo -= DMA_BUFFER_SIZE;
-            lastRxCounter += DMA_BUFFER_SIZE;
-            AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
-            AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
-        }
+       // And put the FPGA in the appropriate mode
+       // Signal field is off with the appropriate LED
+       LED_D_OFF();
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);

 
 

-        samples += 4;
-        if(MillerDecoding((smpl & 0xF0) >> 4)) {
-            rsamples = samples - Uart.samples;
-            LED_C_ON();
-            if(triggered) {
-                trace[traceLen++] = ((rsamples >>  0) & 0xff);
-                trace[traceLen++] = ((rsamples >>  8) & 0xff);
-                trace[traceLen++] = ((rsamples >> 16) & 0xff);
-                trace[traceLen++] = ((rsamples >> 24) & 0xff);
-                trace[traceLen++] = ((Uart.parityBits >>  0) & 0xff);
-                trace[traceLen++] = ((Uart.parityBits >>  8) & 0xff);
-                trace[traceLen++] = ((Uart.parityBits >> 16) & 0xff);
-                trace[traceLen++] = ((Uart.parityBits >> 24) & 0xff);
-                trace[traceLen++] = Uart.byteCnt;
-                memcpy(trace+traceLen, receivedCmd, Uart.byteCnt);
-                traceLen += Uart.byteCnt;
-                if(traceLen > TRACE_LENGTH) break;
-            }
-            /* And ready to receive another command. */
-            Uart.state = STATE_UNSYNCD;
-            /* And also reset the demod code, which might have been */
-            /* false-triggered by the commands from the reader. */
-            Demod.state = DEMOD_UNSYNCD;
-            LED_B_OFF();
-        }
+       // Count of samples received so far, so that we can include timing
+       // information in the trace buffer.
+       rsamples = 0;
+       // And now we loop, receiving samples.
+       while(true) {
+               if(BUTTON_PRESS()) {
+                       DbpString("cancelled by button");
+                       goto done;
+               }

 
 

-        if(ManchesterDecoding(smpl & 0x0F)) {
-            rsamples = samples - Demod.samples;
-            LED_B_ON();
-
-            // timestamp, as a count of samples
-            trace[traceLen++] = ((rsamples >>  0) & 0xff);
-            trace[traceLen++] = ((rsamples >>  8) & 0xff);
-            trace[traceLen++] = ((rsamples >> 16) & 0xff);
-            trace[traceLen++] = 0x80 | ((rsamples >> 24) & 0xff);
-            trace[traceLen++] = ((Demod.parityBits >>  0) & 0xff);
-            trace[traceLen++] = ((Demod.parityBits >>  8) & 0xff);
-            trace[traceLen++] = ((Demod.parityBits >> 16) & 0xff);
-            trace[traceLen++] = ((Demod.parityBits >> 24) & 0xff);
-            // length
-            trace[traceLen++] = Demod.len;
-            memcpy(trace+traceLen, receivedResponse, Demod.len);
-            traceLen += Demod.len;
-            if(traceLen > TRACE_LENGTH) break;
-
-            triggered = TRUE;
-
-            // And ready to receive another response.
-            memset(&Demod, 0, sizeof(Demod));
-            Demod.output = receivedResponse;
-            Demod.state = DEMOD_UNSYNCD;
-            LED_C_OFF();
-        }
+               LED_A_ON();
+               WDT_HIT();

 
 

-        if(BUTTON_PRESS()) {
-            DbpString("cancelled_a");
-            goto done;
-        }
-    }
+               int register readBufDataP = data - dmaBuf;
+               int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR;
+               if (readBufDataP <= dmaBufDataP){
+                       dataLen = dmaBufDataP - readBufDataP;
+               } else {
+                       dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1;
+               }
+               // test for length of buffer
+               if(dataLen > maxDataLen) {
+                       maxDataLen = dataLen;
+                       if(dataLen > 400) {
+                               Dbprintf("blew circular buffer! dataLen=0x%x", dataLen);
+                               goto done;
+                       }
+               }
+               if(dataLen < 1) continue;

 
 

-    DbpString("COMMAND FINISHED");
+               // primary buffer was stopped( <-- we lost data!
+               if (!AT91C_BASE_PDC_SSC->PDC_RCR) {
+                       AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf;
+                       AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE;
+               }
+               // secondary buffer sets as primary, secondary buffer was stopped
+               if (!AT91C_BASE_PDC_SSC->PDC_RNCR) {
+                       AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
+                       AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
+               }
+
+               LED_A_OFF();
+               
+               rsamples += 4;
+               if(MillerDecoding((data[0] & 0xF0) >> 4)) {
+                       LED_C_ON();
+
+                       // check - if there is a short 7bit request from reader
+                       if ((!triggered) && (param & 0x02) && (Uart.byteCnt == 1) && (Uart.bitCnt = 9)) triggered = TRUE;
+
+                       if(triggered) {
+                               if (!LogTrace(receivedCmd, Uart.byteCnt, 0 - Uart.samples, Uart.parityBits, TRUE)) break;
+                       }
+                       /* And ready to receive another command. */
+                       Uart.state = STATE_UNSYNCD;
+                       /* And also reset the demod code, which might have been */
+                       /* false-triggered by the commands from the reader. */
+                       Demod.state = DEMOD_UNSYNCD;
+                       LED_B_OFF();
+               }
+
+               if(ManchesterDecoding(data[0] & 0x0F)) {
+                       LED_B_ON();
+
+                       if (!LogTrace(receivedResponse, Demod.len, 0 - Demod.samples, Demod.parityBits, FALSE)) break;
+
+                       if ((!triggered) && (param & 0x01)) triggered = TRUE;
+
+                       // And ready to receive another response.
+                       memset(&Demod, 0, sizeof(Demod));
+                       Demod.output = receivedResponse;
+                       Demod.state = DEMOD_UNSYNCD;
+                       LED_C_OFF();
+               }
+
+               data++;
+               if(data > dmaBuf + DMA_BUFFER_SIZE) {
+                       data = dmaBuf;
+               }
+       } // main cycle

 
 

-    Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
-    Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+       DbpString("COMMAND FINISHED");

 
 done:
 
 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]);
-    LED_A_OFF();
-    LED_B_OFF();
-       LED_C_OFF();
-       LED_D_OFF();
+       AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
+       Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x", maxDataLen, Uart.state, Uart.byteCnt);
+       Dbprintf("Uart.byteCntMax=%x, traceLen=%x, Uart.output[0]=%08x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+       LEDsoff();

 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------


@@ -780,7 +726,6 @@ done:
 static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity)
 {
        int i;
 static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity)
 {
        int i;

-//     int oddparity;

 
        ToSendReset();
 
 
        ToSendReset();
 


@@ -802,9 +747,7 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity
                uint8_t b = cmd[i];
 
                // Data bits
                uint8_t b = cmd[i];
 
                // Data bits

-//             oddparity = 0x01;

                for(j = 0; j < 8; j++) {
                for(j = 0; j < 8; j++) {

-//                     oddparity ^= (b & 1);

                        if(b & 1) {
                                ToSend[++ToSendMax] = SEC_D;
                        } else {
                        if(b & 1) {
                                ToSend[++ToSendMax] = SEC_D;
                        } else {


@@ -813,92 +756,73 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity
                        b >>= 1;
                }
 
                        b >>= 1;
                }
 

-       // Get the parity bit
+               // Get the parity bit

                if ((dwParity >> i) & 0x01) {
                        ToSend[++ToSendMax] = SEC_D;
                } else {
                        ToSend[++ToSendMax] = SEC_E;
                }
                if ((dwParity >> i) & 0x01) {
                        ToSend[++ToSendMax] = SEC_D;
                } else {
                        ToSend[++ToSendMax] = SEC_E;
                }

-               
-                       // Parity bit
-//                     if(oddparity) {
-//                             ToSend[++ToSendMax] = SEC_D;
-//                     } else {
-//                             ToSend[++ToSendMax] = SEC_E;
-//                     }
-
-//             if (oddparity != ((dwParity >> i) & 0x01))
-//               Dbprintf("par error. i=%d", i);

        }
 
        // Send stopbit
        ToSend[++ToSendMax] = SEC_F;
 
        }
 
        // Send stopbit
        ToSend[++ToSendMax] = SEC_F;
 

-       // Flush the buffer in FPGA!!
-       for(i = 0; i < 5; i++) {
-               ToSend[++ToSendMax] = SEC_F;
-       }
-

        // Convert from last byte pos to length
        ToSendMax++;
        // Convert from last byte pos to length
        ToSendMax++;

-
-    // Add a few more for slop
-//    ToSend[ToSendMax++] = 0x00;
-//     ToSend[ToSendMax++] = 0x00;

 }
 
 static void CodeIso14443aAsTag(const uint8_t *cmd, int len){
        CodeIso14443aAsTagPar(cmd, len, GetParity(cmd, len));
 }
 
 }
 
 static void CodeIso14443aAsTag(const uint8_t *cmd, int len){
        CodeIso14443aAsTagPar(cmd, len, GetParity(cmd, len));
 }
 

-//-----------------------------------------------------------------------------
-// This is to send a NACK kind of answer, its only 3 bits, I know it should be 4
-//-----------------------------------------------------------------------------
-static void CodeStrangeAnswerAsTag()
-{
-       int i;
-
-    ToSendReset();
-
-       // Correction bit, might be removed when not needed
-       ToSendStuffBit(0);
-       ToSendStuffBit(0);
-       ToSendStuffBit(0);
-       ToSendStuffBit(0);
-       ToSendStuffBit(1);  // 1
-       ToSendStuffBit(0);
-       ToSendStuffBit(0);
-       ToSendStuffBit(0);
-
-       // Send startbit
-       ToSend[++ToSendMax] = SEC_D;
-
-       // 0
-       ToSend[++ToSendMax] = SEC_E;
-
-       // 0
-       ToSend[++ToSendMax] = SEC_E;
-
-       // 1
-       ToSend[++ToSendMax] = SEC_D;
-
-    // Send stopbit
-       ToSend[++ToSendMax] = SEC_F;
-
-       // Flush the buffer in FPGA!!
-       for(i = 0; i < 5; i++) {
-               ToSend[++ToSendMax] = SEC_F;
-       }
-
-    // Convert from last byte pos to length
-    ToSendMax++;
-}
+////-----------------------------------------------------------------------------
+//// This is to send a NACK kind of answer, its only 3 bits, I know it should be 4
+////-----------------------------------------------------------------------------
+//static void CodeStrangeAnswerAsTag()
+//{
+//     int i;
+//
+//     ToSendReset();
+//
+//     // Correction bit, might be removed when not needed
+//     ToSendStuffBit(0);
+//     ToSendStuffBit(0);
+//     ToSendStuffBit(0);
+//     ToSendStuffBit(0);
+//     ToSendStuffBit(1);  // 1
+//     ToSendStuffBit(0);
+//     ToSendStuffBit(0);
+//     ToSendStuffBit(0);
+//
+//     // Send startbit
+//     ToSend[++ToSendMax] = SEC_D;
+//
+//     // 0
+//     ToSend[++ToSendMax] = SEC_E;
+//
+//     // 0
+//     ToSend[++ToSendMax] = SEC_E;
+//
+//     // 1
+//     ToSend[++ToSendMax] = SEC_D;
+//
+//     // Send stopbit
+//     ToSend[++ToSendMax] = SEC_F;
+//
+//     // Flush the buffer in FPGA!!
+//     for(i = 0; i < 5; i++) {
+//             ToSend[++ToSendMax] = SEC_F;
+//     }
+//
+//     // Convert from last byte pos to length
+//     ToSendMax++;
+//}

 
 static void Code4bitAnswerAsTag(uint8_t cmd)
 {
        int i;
 
 
 static void Code4bitAnswerAsTag(uint8_t cmd)
 {
        int i;
 

-    ToSendReset();
+       ToSendReset();

 
        // Correction bit, might be removed when not needed
        ToSendStuffBit(0);
 
        // Correction bit, might be removed when not needed
        ToSendStuffBit(0);


@@ -931,8 +855,8 @@ static void Code4bitAnswerAsTag(uint8_t cmd)
                ToSend[++ToSendMax] = SEC_F;
        }
 
                ToSend[++ToSendMax] = SEC_F;
        }
 

-    // Convert from last byte pos to length
-    ToSendMax++;
+       // Convert from last byte pos to length
+       ToSendMax++;

 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------


@@ -974,98 +898,197 @@ static int GetIso14443aCommandFromReader(uint8_t *received, int *len, int maxLen
         }
     }
 }
         }
     }
 }

-static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded);
-
-//-----------------------------------------------------------------------------
-// Main loop of simulated tag: receive commands from reader, decide what
-// response to send, and send it.
-//-----------------------------------------------------------------------------
-void SimulateIso14443aTag(int tagType, int TagUid)
-{
-       // This function contains the tag emulation
-
-       // Prepare protocol messages
-    // static const uint8_t cmd1[] = { 0x26 };
-//     static const uint8_t response1[] = { 0x02, 0x00 }; // Says: I am Mifare 4k - original line - greg
-//
-       static const uint8_t response1[] = { 0x44, 0x03 }; // Says: I am a DESFire Tag, ph33r me
-//     static const uint8_t response1[] = { 0x44, 0x00 }; // Says: I am a ULTRALITE Tag, 0wn me
-
-       // UID response
-    // static const uint8_t cmd2[] = { 0x93, 0x20 };
-    //static const uint8_t response2[] = { 0x9a, 0xe5, 0xe4, 0x43, 0xd8 }; // original value - greg

 
 

-// my desfire
-    static const uint8_t response2[] = { 0x88, 0x04, 0x21, 0x3f, 0x4d }; // known uid - note cascade (0x88), 2nd byte (0x04) = NXP/Phillips
-
-
-// When reader selects us during cascade1 it will send cmd3
-//uint8_t response3[] = { 0x04, 0x00, 0x00 }; // SAK Select (cascade1) successful response (ULTRALITE)
-uint8_t response3[] = { 0x24, 0x00, 0x00 }; // SAK Select (cascade1) successful response (DESFire)
-ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]);
-
-// send cascade2 2nd half of UID
-static const uint8_t response2a[] = { 0x51, 0x48, 0x1d, 0x80, 0x84 }; //  uid - cascade2 - 2nd half (4 bytes) of UID+ BCCheck
-// NOTE : THE CRC on the above may be wrong as I have obfuscated the actual UID
-
-// When reader selects us during cascade2 it will send cmd3a
-//uint8_t response3a[] = { 0x00, 0x00, 0x00 }; // SAK Select (cascade2) successful response (ULTRALITE)
-uint8_t response3a[] = { 0x20, 0x00, 0x00 }; // SAK Select (cascade2) successful response (DESFire)
-ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
-
-    static const uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce
-
-    uint8_t *resp;
-    int respLen;
+static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded);
+int EmSend4bitEx(uint8_t resp, int correctionNeeded);
+int EmSend4bit(uint8_t resp);
+int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par);
+int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par);
+int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded);
+int EmSendCmd(uint8_t *resp, int respLen);
+int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par);
+
+static uint8_t* free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
+
+typedef struct {
+  uint8_t* response;
+  size_t   response_n;
+  uint8_t* modulation;
+  size_t   modulation_n;
+} tag_response_info_t;
+
+void reset_free_buffer() {
+  free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
+}

 
 

-    // Longest possible response will be 16 bytes + 2 CRC = 18 bytes
-       // This will need
+bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffer_size) {
+       // Exmaple response, answer to MIFARE Classic read block will be 16 bytes + 2 CRC = 18 bytes
+       // This will need the following byte array for a modulation sequence

        //    144        data bits (18 * 8)
        //     18        parity bits
        //      2        Start and stop
        //      1        Correction bit (Answer in 1172 or 1236 periods, see FPGA)
        //      1        just for the case
        // ----------- +
        //    144        data bits (18 * 8)
        //     18        parity bits
        //      2        Start and stop
        //      1        Correction bit (Answer in 1172 or 1236 periods, see FPGA)
        //      1        just for the case
        // ----------- +

-       //    166
+       //    166 bytes, since every bit that needs to be send costs us a byte

        //
        //

-       // 166 bytes, since every bit that needs to be send costs us a byte
-       //
-
-    // Respond with card type
-    uint8_t *resp1 = (((uint8_t *)BigBuf) + 800);
-    int resp1Len;
-
-    // Anticollision cascade1 - respond with uid
-    uint8_t *resp2 = (((uint8_t *)BigBuf) + 970);
-    int resp2Len;
-
-    // Anticollision cascade2 - respond with 2nd half of uid if asked
-    // we're only going to be asked if we set the 1st byte of the UID (during cascade1) to 0x88
-    uint8_t *resp2a = (((uint8_t *)BigBuf) + 1140);
-    int resp2aLen;
+  
+  // Prepare the tag modulation bits from the message
+  CodeIso14443aAsTag(response_info->response,response_info->response_n);
+  
+  // Make sure we do not exceed the free buffer space
+  if (ToSendMax > max_buffer_size) {
+    Dbprintf("Out of memory, when modulating bits for tag answer:");
+    Dbhexdump(response_info->response_n,response_info->response,false);
+    return false;
+  }
+  
+  // Copy the byte array, used for this modulation to the buffer position
+  memcpy(response_info->modulation,ToSend,ToSendMax);
+  
+  // Store the number of bytes that were used for encoding/modulation
+  response_info->modulation_n = ToSendMax;
+  
+  return true;
+}

 
 

-    // Acknowledge select - cascade 1
-    uint8_t *resp3 = (((uint8_t *)BigBuf) + 1310);
-    int resp3Len;
+bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) {
+  // Retrieve and store the current buffer index
+  response_info->modulation = free_buffer_pointer;
+  
+  // Determine the maximum size we can use from our buffer
+  size_t max_buffer_size = (((uint8_t *)BigBuf)+FREE_BUFFER_OFFSET+FREE_BUFFER_SIZE)-free_buffer_pointer;
+  
+  // Forward the prepare tag modulation function to the inner function
+  if (prepare_tag_modulation(response_info,max_buffer_size)) {
+    // Update the free buffer offset
+    free_buffer_pointer += ToSendMax;
+    return true;
+  } else {
+    return false;
+  }
+}

 
 

-    // Acknowledge select - cascade 2
-    uint8_t *resp3a = (((uint8_t *)BigBuf) + 1480);
-    int resp3aLen;
+//-----------------------------------------------------------------------------
+// Main loop of simulated tag: receive commands from reader, decide what
+// response to send, and send it.
+//-----------------------------------------------------------------------------
+void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
+{
+       // Enable and clear the trace
+       tracing = TRUE;
+       iso14a_clear_trace();

 
 

-    // Response to a read request - not implemented atm
-    uint8_t *resp4 = (((uint8_t *)BigBuf) + 1550);
-    int resp4Len;
+       // This function contains the tag emulation
+       uint8_t sak;

 
 

-    // Authenticate response - nonce
-    uint8_t *resp5 = (((uint8_t *)BigBuf) + 1720);
-    int resp5Len;
+       // The first response contains the ATQA (note: bytes are transmitted in reverse order).
+       uint8_t response1[2];
+       
+       switch (tagType) {
+               case 1: { // MIFARE Classic
+                       // Says: I am Mifare 1k - original line
+                       response1[0] = 0x04;
+                       response1[1] = 0x00;
+                       sak = 0x08;
+               } break;
+               case 2: { // MIFARE Ultralight
+                       // Says: I am a stupid memory tag, no crypto
+                       response1[0] = 0x04;
+                       response1[1] = 0x00;
+                       sak = 0x00;
+               } break;
+               case 3: { // MIFARE DESFire
+                       // Says: I am a DESFire tag, ph33r me
+                       response1[0] = 0x04;
+                       response1[1] = 0x03;
+                       sak = 0x20;
+               } break;
+               case 4: { // ISO/IEC 14443-4
+                       // Says: I am a javacard (JCOP)
+                       response1[0] = 0x04;
+                       response1[1] = 0x00;
+                       sak = 0x28;
+               } break;
+               default: {
+                       Dbprintf("Error: unkown tagtype (%d)",tagType);
+                       return;
+               } break;
+       }
+       
+       // The second response contains the (mandatory) first 24 bits of the UID
+       uint8_t response2[5];
+
+       // Check if the uid uses the (optional) part
+       uint8_t response2a[5];
+       if (uid_2nd) {
+               response2[0] = 0x88;
+               num_to_bytes(uid_1st,3,response2+1);
+               num_to_bytes(uid_2nd,4,response2a);
+               response2a[4] = response2a[0] ^ response2a[1] ^ response2a[2] ^ response2a[3];
+
+               // Configure the ATQA and SAK accordingly
+               response1[0] |= 0x40;
+               sak |= 0x04;
+       } else {
+               num_to_bytes(uid_1st,4,response2);
+               // Configure the ATQA and SAK accordingly
+               response1[0] &= 0xBF;
+               sak &= 0xFB;
+       }

 
 

-    uint8_t *receivedCmd = (uint8_t *)BigBuf;
-    int len;
+       // Calculate the BitCountCheck (BCC) for the first 4 bytes of the UID.
+       response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3];
+
+       // Prepare the mandatory SAK (for 4 and 7 byte UID)
+       uint8_t response3[3];
+       response3[0] = sak;
+       ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]);
+
+       // Prepare the optional second SAK (for 7 byte UID), drop the cascade bit
+       uint8_t response3a[3];
+       response3a[0] = sak & 0xFB;
+       ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
+
+       uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce
+       uint8_t response6[] = { 0x04, 0x58, 0x00, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS
+       ComputeCrc14443(CRC_14443_A, response6, 4, &response6[4], &response6[5]);
+
+  #define TAG_RESPONSE_COUNT 7
+  tag_response_info_t responses[TAG_RESPONSE_COUNT] = {
+    { .response = response1,  .response_n = sizeof(response1)  },  // Answer to request - respond with card type
+    { .response = response2,  .response_n = sizeof(response2)  },  // Anticollision cascade1 - respond with uid
+    { .response = response2a, .response_n = sizeof(response2a) },  // Anticollision cascade2 - respond with 2nd half of uid if asked
+    { .response = response3,  .response_n = sizeof(response3)  },  // Acknowledge select - cascade 1
+    { .response = response3a, .response_n = sizeof(response3a) },  // Acknowledge select - cascade 2
+    { .response = response5,  .response_n = sizeof(response5)  },  // Authentication answer (random nonce)
+    { .response = response6,  .response_n = sizeof(response6)  },  // dummy ATS (pseudo-ATR), answer to RATS
+  };
+
+  // Allocate 512 bytes for the dynamic modulation, created when the reader querries for it
+  // Such a response is less time critical, so we can prepare them on the fly
+  #define DYNAMIC_RESPONSE_BUFFER_SIZE 64
+  #define DYNAMIC_MODULATION_BUFFER_SIZE 512
+  uint8_t dynamic_response_buffer[DYNAMIC_RESPONSE_BUFFER_SIZE];
+  uint8_t dynamic_modulation_buffer[DYNAMIC_MODULATION_BUFFER_SIZE];
+  tag_response_info_t dynamic_response_info = {
+    .response = dynamic_response_buffer,
+    .response_n = 0,
+    .modulation = dynamic_modulation_buffer,
+    .modulation_n = 0
+  };
+  
+  // Reset the offset pointer of the free buffer
+  reset_free_buffer();
+  
+  // Prepare the responses of the anticollision phase
+       // there will be not enough time to do this at the moment the reader sends it REQA
+  for (size_t i=0; i<TAG_RESPONSE_COUNT; i++) {
+    prepare_allocated_tag_modulation(&responses[i]);
+  }

 
 

-    int i;
-       int u;
-       uint8_t b;
+       uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+       int len;

 
        // To control where we are in the protocol
        int order = 0;
 
        // To control where we are in the protocol
        int order = 0;


@@ -1074,131 +1097,122 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
        // Just to allow some checks
        int happened = 0;
        int happened2 = 0;
        // Just to allow some checks
        int happened = 0;
        int happened2 = 0;

+       int cmdsRecvd = 0;

 
 

-    int cmdsRecvd = 0;
-
-       int fdt_indicator;
-
-    memset(receivedCmd, 0x44, 400);
-
-       // Prepare the responses of the anticollision phase
-       // there will be not enough time to do this at the moment the reader sends it REQA
-
-       // Answer to request
-       CodeIso14443aAsTag(response1, sizeof(response1));
-    memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
-
-       // Send our UID (cascade 1)
-       CodeIso14443aAsTag(response2, sizeof(response2));
-    memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
-
-       // Answer to select (cascade1)
-       CodeIso14443aAsTag(response3, sizeof(response3));
-    memcpy(resp3, ToSend, ToSendMax); resp3Len = ToSendMax;
-
-       // Send the cascade 2 2nd part of the uid
-       CodeIso14443aAsTag(response2a, sizeof(response2a));
-    memcpy(resp2a, ToSend, ToSendMax); resp2aLen = ToSendMax;
-
-       // Answer to select (cascade 2)
-       CodeIso14443aAsTag(response3a, sizeof(response3a));
-    memcpy(resp3a, ToSend, ToSendMax); resp3aLen = ToSendMax;
-
-       // Strange answer is an example of rare message size (3 bits)
-       CodeStrangeAnswerAsTag();
-       memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
-
-       // Authentication answer (random nonce)
-       CodeIso14443aAsTag(response5, sizeof(response5));
-    memcpy(resp5, ToSend, ToSendMax); resp5Len = ToSendMax;
-
-    // We need to listen to the high-frequency, peak-detected path.
-    SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-    FpgaSetupSsc();
+       // We need to listen to the high-frequency, peak-detected path.
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+       FpgaSetupSsc();

 
 

-    cmdsRecvd = 0;
+       cmdsRecvd = 0;
+  tag_response_info_t* p_response;

 
 

-    LED_A_ON();
+       LED_A_ON();

        for(;;) {
        for(;;) {

-
-               if(!GetIso14443aCommandFromReader(receivedCmd, &len, 100)) {
-            DbpString("button press");
-            break;
-        }
-       // doob - added loads of debug strings so we can see what the reader is saying to us during the sim as hi14alist is not populated
-        // Okay, look at the command now.
-        lastorder = order;
-               i = 1; // first byte transmitted
-        if(receivedCmd[0] == 0x26) {
-                       // Received a REQUEST
-                       resp = resp1; respLen = resp1Len; order = 1;
-                       //DbpString("Hello request from reader:");
-               } else if(receivedCmd[0] == 0x52) {
-                       // Received a WAKEUP
-                       resp = resp1; respLen = resp1Len; order = 6;
-//                     //DbpString("Wakeup request from reader:");
-
-               } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) {   // greg - cascade 1 anti-collision
-                       // Received request for UID (cascade 1)
-                       resp = resp2; respLen = resp2Len; order = 2;
-//                     DbpString("UID (cascade 1) request from reader:");
-//                     DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
-
-               } else if(receivedCmd[1] == 0x20 && receivedCmd[0] ==0x95) {    // greg - cascade 2 anti-collision
-                       // Received request for UID (cascade 2)
-                       resp = resp2a; respLen = resp2aLen; order = 20;
-//                     DbpString("UID (cascade 2) request from reader:");
-//                     DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
-
-               } else if(receivedCmd[1] == 0x70 && receivedCmd[0] ==0x93) {    // greg - cascade 1 select
-                       // Received a SELECT
-                       resp = resp3; respLen = resp3Len; order = 3;
-//                     DbpString("Select (cascade 1) request from reader:");
-//                     DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
-
-               } else if(receivedCmd[1] == 0x70 && receivedCmd[0] ==0x95) {    // greg - cascade 2 select
-                       // Received a SELECT
-                       resp = resp3a; respLen = resp3aLen; order = 30;
-//                     DbpString("Select (cascade 2) request from reader:");
-//                     DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
-
-               } else if(receivedCmd[0] == 0x30) {
-                       // Received a READ
-                       resp = resp4; respLen = resp4Len; order = 4; // Do nothing
-                       Dbprintf("Read request from reader: %x %x %x",
-                               receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
-
-               } else if(receivedCmd[0] == 0x50) {
-                       // Received a HALT
-                       resp = resp1; respLen = 0; order = 5; // Do nothing
-                       DbpString("Reader requested we HALT!:");
-
-               } else if(receivedCmd[0] == 0x60) {
-                       // Received an authentication request
-                       resp = resp5; respLen = resp5Len; order = 7;
-                       Dbprintf("Authenticate request from reader: %x %x %x",
-                               receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
-               } else if(receivedCmd[0] == 0xE0) {
-                       // Received a RATS request
-                       resp = resp1; respLen = 0;order = 70;
-                       Dbprintf("RATS request from reader: %x %x %x",
-                               receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-        } 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;
+    // Clean receive command buffer
+    memset(receivedCmd, 0x44, RECV_CMD_SIZE);
+       
+               if(!GetIso14443aCommandFromReader(receivedCmd, &len, RECV_CMD_SIZE)) {
+                       DbpString("Button press");
+                       break;
+               }
+    
+               if (tracing) {
+                       LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE);
+               }
+    
+    p_response = NULL;
+    
+               // doob - added loads of debug strings so we can see what the reader is saying to us during the sim as hi14alist is not populated
+               // Okay, look at the command now.
+               lastorder = order;
+               if(receivedCmd[0] == 0x26) { // Received a REQUEST
+                       p_response = &responses[0]; order = 1;
+               } else if(receivedCmd[0] == 0x52) { // Received a WAKEUP
+                       p_response = &responses[0]; order = 6;
+               } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) {   // Received request for UID (cascade 1)
+                       p_response = &responses[1]; order = 2;
+               } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x95) { // Received request for UID (cascade 2)
+                       p_response = &responses[2]; order = 20;
+               } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x93) {   // Received a SELECT (cascade 1)
+                       p_response = &responses[3]; order = 3;
+               } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x95) {   // Received a SELECT (cascade 2)
+                       p_response = &responses[4]; order = 30;
+               } else if(receivedCmd[0] == 0x30) {     // Received a (plain) READ
+                       EmSendCmdEx(data+(4*receivedCmd[0]),16,false);
+                       Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
+                       // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
+      p_response = NULL;
+               } else if(receivedCmd[0] == 0x50) {     // Received a HALT
+//                     DbpString("Reader requested we HALT!:");
+      p_response = NULL;
+               } else if(receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61) {   // Received an authentication request
+                       p_response = &responses[5]; order = 7;
+               } else if(receivedCmd[0] == 0xE0) {     // Received a RATS request
+                       p_response = &responses[6]; order = 70;
+               } else if (order == 7 && len ==8) { // Received authentication request
+      uint32_t nr = bytes_to_num(receivedCmd,4);
+      uint32_t ar = bytes_to_num(receivedCmd+4,4);
+      Dbprintf("Auth attempt {nr}{ar}: %08x %08x",nr,ar);
+    } else {
+      // Check for ISO 14443A-4 compliant commands, look at left nibble
+      switch (receivedCmd[0]) {
+
+        case 0x0B:
+        case 0x0A: { // IBlock (command)
+          dynamic_response_info.response[0] = receivedCmd[0];
+          dynamic_response_info.response[1] = 0x00;
+          dynamic_response_info.response[2] = 0x90;
+          dynamic_response_info.response[3] = 0x00;
+          dynamic_response_info.response_n = 4;
+        } break;
+
+        case 0x1A:
+        case 0x1B: { // Chaining command
+          dynamic_response_info.response[0] = 0xaa | ((receivedCmd[0]) & 1);
+          dynamic_response_info.response_n = 2;
+        } break;
+
+        case 0xaa:
+        case 0xbb: {
+          dynamic_response_info.response[0] = receivedCmd[0] ^ 0x11;
+          dynamic_response_info.response_n = 2;
+        } break;
+          
+        case 0xBA: { //
+          memcpy(dynamic_response_info.response,"\xAB\x00",2);
+          dynamic_response_info.response_n = 2;
+        } break;
+
+        case 0xCA:
+        case 0xC2: { // Readers sends deselect command
+          memcpy(dynamic_response_info.response,"\xCA\x00",2);
+          dynamic_response_info.response_n = 2;
+        } break;
+
+        default: {
+          // Never seen this command before
+          Dbprintf("Received unknown command (len=%d):",len);
+          Dbhexdump(len,receivedCmd,false);
+          // Do not respond
+          dynamic_response_info.response_n = 0;
+        } break;
+      }
+      
+      if (dynamic_response_info.response_n > 0) {
+        // Copy the CID from the reader query
+        dynamic_response_info.response[1] = receivedCmd[1];
+
+        // Add CRC bytes, always used in ISO 14443A-4 compliant cards
+        AppendCrc14443a(dynamic_response_info.response,dynamic_response_info.response_n);
+        dynamic_response_info.response_n += 2;
+        
+        if (prepare_tag_modulation(&dynamic_response_info,DYNAMIC_MODULATION_BUFFER_SIZE) == false) {
+          Dbprintf("Error preparing tag response");
+          break;

         }
         }

+        p_response = &dynamic_response_info;
+      }
+               }

 
                // Count number of wakeups received after a halt
                if(order == 6 && lastorder == 5) { happened++; }
 
                // Count number of wakeups received after a halt
                if(order == 6 && lastorder == 5) { happened++; }


@@ -1209,171 +1223,103 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
                // Look at last parity bit to determine timing of answer
                if((Uart.parityBits & 0x01) || receivedCmd[0] == 0x52) {
                        // 1236, so correction bit needed
                // Look at last parity bit to determine timing of answer
                if((Uart.parityBits & 0x01) || receivedCmd[0] == 0x52) {
                        // 1236, so correction bit needed

-                       i = 0;
+                       //i = 0;

                }
 
                }
 

-        memset(receivedCmd, 0x44, 32);
-

                if(cmdsRecvd > 999) {
                        DbpString("1000 commands later...");
                if(cmdsRecvd > 999) {
                        DbpString("1000 commands later...");

-            break;
-        }
-               else {
-                       cmdsRecvd++;
-               }
-
-        if(respLen <= 0) continue;
-               //----------------------------
-               u = 0;
-               b = 0x00;
-               fdt_indicator = FALSE;
-
-               EmSendCmd14443aRaw(resp, respLen, receivedCmd[0] == 0x52);
-/*        // Modulate Manchester
-               FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
-        AT91C_BASE_SSC->SSC_THR = 0x00;
-        FpgaSetupSsc();
-
-               // ### Transmit the response ###
-               u = 0;
-               b = 0x00;
-               fdt_indicator = FALSE;
-        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(i > respLen) {
-                                       b = 0x00;
-                                       u++;
-                               } else {
-                                       b = resp[i];
-                                       i++;
-                               }
-                               AT91C_BASE_SSC->SSC_THR = b;
-
-                if(u > 4) {
-                    break;
-                }
-            }
-                       if(BUTTON_PRESS()) {
-                           break;
-                       }
+                       break;
+               }
+               cmdsRecvd++;
+
+               if (p_response != NULL) {
+      EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n, receivedCmd[0] == 0x52);
+      if (tracing) {
+        LogTrace(p_response->response,p_response->response_n,0,SwapBits(GetParity(p_response->response,p_response->response_n),p_response->response_n),FALSE);
+        if(traceLen > TRACE_SIZE) {
+          DbpString("Trace full");
+//          break;

         }
         }

-*/
+      }

     }
     }

+  }

 
        Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
        LED_A_OFF();
 }
 
 
        Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
        LED_A_OFF();
 }
 

-//-----------------------------------------------------------------------------
-// Transmit the command (to the tag) that was placed in ToSend[].
-//-----------------------------------------------------------------------------
-static void TransmitFor14443a(const uint8_t *cmd, int len, int *samples, int *wait)
-{
-  int c;
-
-  FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-
-       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();
-  }

 
 

-  c = 0;
-  for(;;) {
-    if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-      AT91C_BASE_SSC->SSC_THR = cmd[c];
-      c++;
-      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 a delayed transfer. This simply shifts ToSend[] by a number
+// of bits specified in the delay parameter.
+void PrepareDelayedTransfer(uint16_t delay)
+{
+       uint8_t bitmask = 0;
+       uint8_t bits_to_shift = 0;
+       uint8_t bits_shifted = 0;
+       
+       delay &= 0x07;
+       if (delay) {
+               for (uint16_t i = 0; i < delay; i++) {
+                       bitmask |= (0x01 << i);
+               }
+               ToSend[++ToSendMax] = 0x00;
+               for (uint16_t i = 0; i < ToSendMax; i++) {
+                       bits_to_shift = ToSend[i] & bitmask;
+                       ToSend[i] = ToSend[i] >> delay;
+                       ToSend[i] = ToSend[i] | (bits_shifted << (8 - delay));
+                       bits_shifted = bits_to_shift;
+               }
+       }

 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------

-// Code a 7-bit command without parity bit
-// This is especially for 0x26 and 0x52 (REQA and WUPA)
+// Transmit the command (to the tag) that was placed in ToSend[].
+// Parameter timing:
+// if NULL: ignored
+// if == 0:    return time of transfer
+// if != 0: delay transfer until time specified

 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------

-void ShortFrameFromReader(const uint8_t bt)
+static void TransmitFor14443a(const uint8_t *cmd, int len, uint32_t *timing)

 {
 {

-       int j;
-       int last;
-  uint8_t b;
+       int c;

 
 

-       ToSendReset();
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);

 
 

-       // Start of Communication (Seq. Z)
-       ToSend[++ToSendMax] = SEC_Z;
-       last = 0;

 
 

-       b = bt;
-       for(j = 0; j < 7; j++) {
-               if(b & 1) {
-                       // Sequence X
-                       ToSend[++ToSendMax] = SEC_X;
-                       last = 1;
+       if (timing) {
+               if(*timing == 0) {                                                                              // Measure time
+                       *timing = (GetCountMifare() + 8) & 0xfffffff8;

                } else {
                } else {

-                       if(last == 0) {
-                               // Sequence Z
-                               ToSend[++ToSendMax] = SEC_Z;
-                       }
-                       else {
-                               // Sequence Y
-                               ToSend[++ToSendMax] = SEC_Y;
-                               last = 0;
-                       }
+                       PrepareDelayedTransfer(*timing & 0x00000007);           // Delay transfer (fine tuning - up to 7 MF clock ticks)

                }
                }

-               b >>= 1;
+               if(MF_DBGLEVEL >= 4 && GetCountMifare() >= (*timing & 0xfffffff8)) Dbprintf("TransmitFor14443a: Missed timing");
+               while(GetCountMifare() < (*timing & 0xfffffff8));               // Delay transfer (multiple of 8 MF clock ticks)

        }
 
        }
 

-       // End of Communication
-       if(last == 0) {
-               // Sequence Z
-               ToSend[++ToSendMax] = SEC_Z;
+       for(c = 0; c < 10;) {   // standard delay for each transfer (allow tag to be ready after last transmission)
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+                       AT91C_BASE_SSC->SSC_THR = 0x00; 
+                       c++;
+               }

        }
        }

-       else {
-               // Sequence Y
-               ToSend[++ToSendMax] = SEC_Y;
-               last = 0;
+       
+       c = 0;
+       for(;;) {
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+                       AT91C_BASE_SSC->SSC_THR = cmd[c];
+                       c++;
+                       if(c >= len) {
+                               break;
+                       }
+               }

        }
        }

-       // Sequence Y
-       ToSend[++ToSendMax] = SEC_Y;
-
-       // Just to be sure!
-       ToSend[++ToSendMax] = SEC_Y;
-       ToSend[++ToSendMax] = SEC_Y;
-       ToSend[++ToSendMax] = SEC_Y;

 
 

-    // Convert from last character reference to length
-    ToSendMax++;

 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------

-// Prepare reader command to send to FPGA
-//
+// Prepare reader command (in bits, support short frames) to send to FPGA

 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------

-void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
+void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, int bits, uint32_t dwParity)

 {
   int i, j;
   int last;
 {
   int i, j;
   int last;


@@ -1385,12 +1331,14 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
   ToSend[++ToSendMax] = SEC_Z;
   last = 0;
 
   ToSend[++ToSendMax] = SEC_Z;
   last = 0;
 

+  size_t bytecount = nbytes(bits);

   // Generate send structure for the data bits
   // Generate send structure for the data bits

-  for (i = 0; i < len; i++) {
+  for (i = 0; i < bytecount; i++) {

     // Get the current byte to send
     b = cmd[i];
     // Get the current byte to send
     b = cmd[i];

+    size_t bitsleft = MIN((bits-(i*8)),8);

 
 

-    for (j = 0; j < 8; j++) {
+    for (j = 0; j < bitsleft; j++) {

       if (b & 1) {
         // Sequence X
          ToSend[++ToSendMax] = SEC_X;
       if (b & 1) {
         // Sequence X
          ToSend[++ToSendMax] = SEC_X;


@@ -1408,19 +1356,22 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
       b >>= 1;
     }
 
       b >>= 1;
     }
 

-    // Get the parity bit
-    if ((dwParity >> i) & 0x01) {
-      // Sequence X
-       ToSend[++ToSendMax] = SEC_X;
-      last = 1;
-    } else {
-      if (last == 0) {
-        // Sequence Z
-         ToSend[++ToSendMax] = SEC_Z;
+    // Only transmit (last) parity bit if we transmitted a complete byte
+    if (j == 8) {
+      // Get the parity bit
+      if ((dwParity >> i) & 0x01) {
+        // Sequence X
+        ToSend[++ToSendMax] = SEC_X;
+        last = 1;

       } else {
       } else {

-        // Sequence Y
-         ToSend[++ToSendMax] = SEC_Y;
-        last = 0;
+        if (last == 0) {
+          // Sequence Z
+          ToSend[++ToSendMax] = SEC_Z;
+        } else {
+          // Sequence Y
+          ToSend[++ToSendMax] = SEC_Y;
+          last = 0;
+        }

       }
     }
   }
       }
     }
   }


@@ -1447,9 +1398,17 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------

-// Wait for commands from reader
-// Stop when button is pressed (return 1) or field was gone (return 2)
-// Or return 0 when command is captured
+// Prepare reader command to send to FPGA
+//-----------------------------------------------------------------------------
+void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
+{
+  CodeIso14443aBitsAsReaderPar(cmd,len*8,dwParity);
+}
+
+//-----------------------------------------------------------------------------
+// Wait for commands from reader
+// Stop when button is pressed (return 1) or field was gone (return 2)
+// Or return 0 when command is captured

 //-----------------------------------------------------------------------------
 static int EmGetCmd(uint8_t *received, int *len, int maxLen)
 {
 //-----------------------------------------------------------------------------
 static int EmGetCmd(uint8_t *received, int *len, int maxLen)
 {


@@ -1611,7 +1570,7 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, int maxLen, int
        // Signal field is on with the appropriate LED
        LED_D_ON();
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN);
        // Signal field is on with the appropriate LED
        LED_D_ON();
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_LISTEN);

-
+       

        // Now get the answer from the card
        Demod.output = receivedResponse;
        Demod.len = 0;
        // Now get the answer from the card
        Demod.output = receivedResponse;
        Demod.len = 0;


@@ -1624,10 +1583,10 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, int maxLen, int
        for(;;) {
                WDT_HIT();
 
        for(;;) {
                WDT_HIT();
 

-               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-                       AT91C_BASE_SSC->SSC_THR = 0x00;  // To make use of exact timing of next command from reader!!
-                       if (elapsed) (*elapsed)++;
-               }
+               // if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+                       // AT91C_BASE_SSC->SSC_THR = 0x00;  // To make use of exact timing of next command from reader!!
+                       // if (elapsed) (*elapsed)++;
+               // }

                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
                        if(c < iso14a_timeout) { c++; } else { return FALSE; }
                        b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
                        if(c < iso14a_timeout) { c++; } else { return FALSE; }
                        b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;


@@ -1643,43 +1602,29 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, int maxLen, int
        }
 }
 
        }
 }
 

-void ReaderTransmitShort(const uint8_t* bt)
-{
-  int wait = 0;
-  int samples = 0;
-
-  ShortFrameFromReader(*bt);
-
-  // Select the card
-  TransmitFor14443a(ToSend, ToSendMax, &samples, &wait);
-
-  // Store reader command in buffer
-  if (tracing) LogTrace(bt,1,0,GetParity(bt,1),TRUE);
-}
-
-void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par)
+void ReaderTransmitBitsPar(uint8_t* frame, int bits, uint32_t par, uint32_t *timing)

 {
 {

-  int wait = 0;
-  int samples = 0;
-
-  // This is tied to other size changes
-  //   uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024;
-  CodeIso14443aAsReaderPar(frame,len,par);

 
 

+  CodeIso14443aBitsAsReaderPar(frame,bits,par);
+  

   // Select the card
   // Select the card

-  TransmitFor14443a(ToSend, ToSendMax, &samples, &wait);
+  TransmitFor14443a(ToSend, ToSendMax, timing);

   if(trigger)
        LED_A_ON();
   if(trigger)
        LED_A_ON();

-
+  

   // Store reader command in buffer
   // Store reader command in buffer

-  if (tracing) LogTrace(frame,len,0,par,TRUE);
+  if (tracing) LogTrace(frame,nbytes(bits),0,par,TRUE);

 }
 
 }
 

+void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par, uint32_t *timing)
+{
+  ReaderTransmitBitsPar(frame,len*8,par, timing);
+}

 
 

-void ReaderTransmit(uint8_t* frame, int len)
+void ReaderTransmit(uint8_t* frame, int len, uint32_t *timing)

 {
   // Generate parity and redirect
 {
   // Generate parity and redirect

-  ReaderTransmitPar(frame,len,GetParity(frame,len));
+  ReaderTransmitBitsPar(frame,len*8,GetParity(frame,len), timing);

 }
 
 int ReaderReceive(uint8_t* receivedAnswer)
 }
 
 int ReaderReceive(uint8_t* receivedAnswer)


@@ -1704,90 +1649,117 @@ int ReaderReceivePar(uint8_t* receivedAnswer, uint32_t * parptr)
 /* performs iso14443a anticolision procedure
  * fills the uid pointer unless NULL
  * fills resp_data unless NULL */
 /* performs iso14443a anticolision procedure
  * fills the uid pointer unless NULL
  * fills resp_data unless NULL */

-int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data, uint32_t * cuid_ptr) {
-       uint8_t wupa[]       = { 0x52 };  // 0x26 - REQA  0x52 - WAKE-UP
-       uint8_t sel_all[]    = { 0x93,0x20 };
-       uint8_t sel_uid[]    = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
-       uint8_t rats[]       = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
+int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, uint32_t* cuid_ptr) {
+  uint8_t wupa[]       = { 0x52 };  // 0x26 - REQA  0x52 - WAKE-UP
+  uint8_t sel_all[]    = { 0x93,0x20 };
+  uint8_t sel_uid[]    = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
+  uint8_t rats[]       = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
+  uint8_t* resp = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);  // was 3560 - tied to other size changes
+  byte_t uid_resp[4];
+  size_t uid_resp_len;
+
+  uint8_t sak = 0x04; // cascade uid
+  int cascade_level = 0;
+  int len;
+        
+  // Broadcast for a card, WUPA (0x52) will force response from all cards in the field
+    ReaderTransmitBitsPar(wupa,7,0, NULL);
+  // Receive the ATQA
+  if(!ReaderReceive(resp)) return 0;
+//  Dbprintf("atqa: %02x %02x",resp[0],resp[1]);
+
+  if(p_hi14a_card) {
+    memcpy(p_hi14a_card->atqa, resp, 2);
+    p_hi14a_card->uidlen = 0;
+    memset(p_hi14a_card->uid,0,10);
+  }

 
 

-       uint8_t* resp = (((uint8_t *)BigBuf) + 3560);   // was 3560 - tied to other size changes
+  // clear uid
+  if (uid_ptr) {
+    memset(uid_ptr,0,10);
+  }

 
 

-       uint8_t sak = 0x04; // cascade uid
-       int cascade_level = 0;
+  // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
+  // which case we need to make a cascade 2 request and select - this is a long UID
+  // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
+  for(; sak & 0x04; cascade_level++) {
+    // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
+    sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
+
+    // SELECT_ALL
+    ReaderTransmit(sel_all,sizeof(sel_all), NULL);
+    if (!ReaderReceive(resp)) return 0;
+
+    // First backup the current uid
+    memcpy(uid_resp,resp,4);
+    uid_resp_len = 4;
+    //    Dbprintf("uid: %02x %02x %02x %02x",uid_resp[0],uid_resp[1],uid_resp[2],uid_resp[3]);
+
+        // calculate crypto UID. Always use last 4 Bytes.
+    if(cuid_ptr) {
+        *cuid_ptr = bytes_to_num(uid_resp, 4);
+    }

 
 

-       int len;
-       
-       // clear uid
-       memset(uid_ptr, 0, 8);
+    // Construct SELECT UID command
+    memcpy(sel_uid+2,resp,5);
+    AppendCrc14443a(sel_uid,7);
+    ReaderTransmit(sel_uid,sizeof(sel_uid), NULL);
+
+    // Receive the SAK
+    if (!ReaderReceive(resp)) return 0;
+    sak = resp[0];
+
+    // Test if more parts of the uid are comming
+    if ((sak & 0x04) && uid_resp[0] == 0x88) {
+      // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of:
+      // http://www.nxp.com/documents/application_note/AN10927.pdf
+      memcpy(uid_resp, uid_resp + 1, 3);
+      uid_resp_len = 3;
+    }

 
 

-       // Broadcast for a card, WUPA (0x52) will force response from all cards in the field
-       ReaderTransmitShort(wupa);
-       // Receive the ATQA
-       if(!ReaderReceive(resp)) return 0;
+    if(uid_ptr) {
+      memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len);
+    }

 
 

-       if(resp_data)
-               memcpy(resp_data->atqa, resp, 2);
-       
-       // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
-       // which case we need to make a cascade 2 request and select - this is a long UID
-       // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
-       for(; sak & 0x04; cascade_level++)
-       {
-               // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
-               sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
+    if(p_hi14a_card) {
+      memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len);
+      p_hi14a_card->uidlen += uid_resp_len;
+    }
+  }

 
 

-               // SELECT_ALL
-               ReaderTransmit(sel_all,sizeof(sel_all));
-               if (!ReaderReceive(resp)) return 0;
-               if(uid_ptr) memcpy(uid_ptr + cascade_level*4, resp, 4);
-               
-               // calculate crypto UID
-               if(cuid_ptr) *cuid_ptr = bytes_to_num(resp, 4);
+  if(p_hi14a_card) {
+    p_hi14a_card->sak = sak;
+    p_hi14a_card->ats_len = 0;
+  }

 
 

-               // Construct SELECT UID command
-               memcpy(sel_uid+2,resp,5);
-               AppendCrc14443a(sel_uid,7);
-               ReaderTransmit(sel_uid,sizeof(sel_uid));
+  if( (sak & 0x20) == 0) {
+    return 2; // non iso14443a compliant tag
+  }

 
 

-               // Receive the SAK
-               if (!ReaderReceive(resp)) return 0;
-               sak = resp[0];
-       }
-       if(resp_data) {
-               resp_data->sak = sak;
-               resp_data->ats_len = 0;
-       }
-       //--  this byte not UID, it CT.  http://www.nxp.com/documents/application_note/AN10927.pdf  page 3
-       if (uid_ptr[0] == 0x88) {  
-               memcpy(uid_ptr, uid_ptr + 1, 7);
-               uid_ptr[7] = 0;
-       }
+  // Request for answer to select
+  AppendCrc14443a(rats, 2);
+  ReaderTransmit(rats, sizeof(rats), NULL);

 
 

-       if( (sak & 0x20) == 0)
-               return 2; // non iso14443a compliant tag
+  if (!(len = ReaderReceive(resp))) return 0;

 
 

-       // Request for answer to select
-       if(resp_data) {  // JCOP cards - if reader sent RATS then there is no MIFARE session at all!!!
-               AppendCrc14443a(rats, 2);
-               ReaderTransmit(rats, sizeof(rats));
-               
-               if (!(len = ReaderReceive(resp))) return 0;
-               
-               memcpy(resp_data->ats, resp, sizeof(resp_data->ats));
-               resp_data->ats_len = len;
-       }
-       
-       return 1;
+  if(p_hi14a_card) {
+    memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats));
+    p_hi14a_card->ats_len = len;
+  }
+
+  // reset the PCB block number
+  iso14_pcb_blocknum = 0;
+  return 1;

 }
 
 void iso14443a_setup() {
 }
 
 void iso14443a_setup() {

-       // Setup SSC
+       // Set up the synchronous serial port

        FpgaSetupSsc();
        // Start from off (no field generated)
        // Signal field is off with the appropriate LED
        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);
+//     LED_D_OFF();
+//     FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       // SpinDelay(50);

 
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
 
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 


@@ -1795,7 +1767,7 @@ void iso14443a_setup() {
        // Signal field is on with the appropriate LED
        LED_D_ON();
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
        // Signal field is on with the appropriate LED
        LED_D_ON();
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);

-       SpinDelay(200);
+       SpinDelay(7); // iso14443-3 specifies 5ms max.

 
        iso14a_timeout = 2048; //default
 }
 
        iso14a_timeout = 2048; //default
 }


@@ -1803,35 +1775,59 @@ void iso14443a_setup() {
 int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) {
        uint8_t real_cmd[cmd_len+4];
        real_cmd[0] = 0x0a; //I-Block
 int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) {
        uint8_t real_cmd[cmd_len+4];
        real_cmd[0] = 0x0a; //I-Block

+       // put block number into the PCB
+       real_cmd[0] |= iso14_pcb_blocknum;

        real_cmd[1] = 0x00; //CID: 0 //FIXME: allow multiple selected cards
        memcpy(real_cmd+2, cmd, cmd_len);
        AppendCrc14443a(real_cmd,cmd_len+2);
  
        real_cmd[1] = 0x00; //CID: 0 //FIXME: allow multiple selected cards
        memcpy(real_cmd+2, cmd, cmd_len);
        AppendCrc14443a(real_cmd,cmd_len+2);
  

-       ReaderTransmit(real_cmd, cmd_len+4);
+       ReaderTransmit(real_cmd, cmd_len+4, NULL);

        size_t len = ReaderReceive(data);
        size_t len = ReaderReceive(data);

-       if(!len)
-               return -1; //DATA LINK ERROR
-       
+       uint8_t * data_bytes = (uint8_t *) data;
+       if (!len)
+               return 0; //DATA LINK ERROR
+       // if we received an I- or R(ACK)-Block with a block number equal to the
+       // current block number, toggle the current block number
+       else if (len >= 4 // PCB+CID+CRC = 4 bytes
+                && ((data_bytes[0] & 0xC0) == 0 // I-Block
+                    || (data_bytes[0] & 0xD0) == 0x80) // R-Block with ACK bit set to 0
+                && (data_bytes[0] & 0x01) == iso14_pcb_blocknum) // equal block numbers
+       {
+               iso14_pcb_blocknum ^= 1;
+       }
+

        return len;
 }
 
        return len;
 }
 

-

 //-----------------------------------------------------------------------------
 // Read an ISO 14443a tag. Send out commands and store answers.
 //
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 // Read an ISO 14443a tag. Send out commands and store answers.
 //
 //-----------------------------------------------------------------------------

-void ReaderIso14443a(UsbCommand * c, UsbCommand * ack)
+void ReaderIso14443a(UsbCommand * c)

 {
        iso14a_command_t param = c->arg[0];
        uint8_t * cmd = c->d.asBytes;
        size_t len = c->arg[1];
 {
        iso14a_command_t param = c->arg[0];
        uint8_t * cmd = c->d.asBytes;
        size_t len = c->arg[1];

+       size_t lenbits = c->arg[2];
+       uint32_t arg0 = 0;
+       byte_t buf[USB_CMD_DATA_SIZE];
+  
+       if(param & ISO14A_CONNECT) {
+               iso14a_clear_trace();
+       }
+       iso14a_set_tracing(true);

 
 

-       if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(1);
+       if(param & ISO14A_REQUEST_TRIGGER) {
+               iso14a_set_trigger(1);
+       }

 
        if(param & ISO14A_CONNECT) {
                iso14443a_setup();
 
        if(param & ISO14A_CONNECT) {
                iso14443a_setup();

-               ack->arg[0] = iso14443a_select_card(ack->d.asBytes, (iso14a_card_select_t *) (ack->d.asBytes+12), NULL);
-               UsbSendPacket((void *)ack, sizeof(UsbCommand));
+               if(!(param & ISO14A_NO_SELECT)) {
+                       iso14a_card_select_t *card = (iso14a_card_select_t*)buf;
+                       arg0 = iso14443a_select_card(NULL,card,NULL);
+                       cmd_send(CMD_ACK,arg0,card->uidlen,0,buf,sizeof(iso14a_card_select_t));
+               }

        }
 
        if(param & ISO14A_SET_TIMEOUT) {
        }
 
        if(param & ISO14A_SET_TIMEOUT) {


@@ -1843,8 +1839,8 @@ void ReaderIso14443a(UsbCommand * c, UsbCommand * ack)
        }
 
        if(param & ISO14A_APDU) {
        }
 
        if(param & ISO14A_APDU) {

-               ack->arg[0] = iso14_apdu(cmd, len, ack->d.asBytes);
-               UsbSendPacket((void *)ack, sizeof(UsbCommand));
+               arg0 = iso14_apdu(cmd, len, buf);
+               cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));

        }
 
        if(param & ISO14A_RAW) {
        }
 
        if(param & ISO14A_RAW) {


@@ -1852,99 +1848,212 @@ void ReaderIso14443a(UsbCommand * c, UsbCommand * ack)
                        AppendCrc14443a(cmd,len);
                        len += 2;
                }
                        AppendCrc14443a(cmd,len);
                        len += 2;
                }

-               ReaderTransmit(cmd,len);
-               ack->arg[0] = ReaderReceive(ack->d.asBytes);
-               UsbSendPacket((void *)ack, sizeof(UsbCommand));
+               if(lenbits>0) {
+                       ReaderTransmitBitsPar(cmd,lenbits,GetParity(cmd,lenbits/8), NULL);
+               } else {
+                       ReaderTransmit(cmd,len, NULL);
+               }
+               arg0 = ReaderReceive(buf);
+               cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));

        }
 
        }
 

-       if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(0);
+       if(param & ISO14A_REQUEST_TRIGGER) {
+               iso14a_set_trigger(0);
+       }

 
 

-       if(param & ISO14A_NO_DISCONNECT)
+       if(param & ISO14A_NO_DISCONNECT) {

                return;
                return;

+       }

 
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        LEDsoff();
 }
 
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        LEDsoff();
 }

+
+
+// Determine the distance between two nonces.
+// Assume that the difference is small, but we don't know which is first.
+// Therefore try in alternating directions.
+int32_t dist_nt(uint32_t nt1, uint32_t nt2) {
+
+       uint16_t i;
+       uint32_t nttmp1, nttmp2;
+
+       if (nt1 == nt2) return 0;
+
+       nttmp1 = nt1;
+       nttmp2 = nt2;
+       
+       for (i = 1; i < 32768; i++) {
+               nttmp1 = prng_successor(nttmp1, 1);
+               if (nttmp1 == nt2) return i;
+               nttmp2 = prng_successor(nttmp2, 1);
+                       if (nttmp2 == nt1) return -i;
+               }
+       
+       return(-99999); // either nt1 or nt2 are invalid nonces
+}
+
+

 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------

-// Read an ISO 14443a tag. Send out commands and store answers.
-//
+// Recover several bits of the cypher stream. This implements (first stages of)
+// the algorithm described in "The Dark Side of Security by Obscurity and
+// Cloning MiFare Classic Rail and Building Passes, Anywhere, Anytime"
+// (article by Nicolas T. Courtois, 2009)

 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------

-void ReaderMifare(uint32_t parameter)
+void ReaderMifare(bool first_try)

 {
        // Mifare AUTH
        uint8_t mf_auth[]    = { 0x60,0x00,0xf5,0x7b };
        uint8_t mf_nr_ar[]   = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
 {
        // Mifare AUTH
        uint8_t mf_auth[]    = { 0x60,0x00,0xf5,0x7b };
        uint8_t mf_nr_ar[]   = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };

+       static uint8_t mf_nr_ar3;

 
 

-       uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes
+       uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);

        traceLen = 0;
        tracing = false;
 
        traceLen = 0;
        tracing = false;
 

-       iso14443a_setup();
-
-       LED_A_ON();
-       LED_B_OFF();
-       LED_C_OFF();
-

        byte_t nt_diff = 0;
        byte_t nt_diff = 0;

-       LED_A_OFF();

        byte_t par = 0;
        byte_t par = 0;

-       byte_t par_mask = 0xff;
-       byte_t par_low = 0;
-       int led_on = TRUE;
-       uint8_t uid[8];
+       //byte_t par_mask = 0xff;
+       static byte_t par_low = 0;
+       bool led_on = TRUE;
+       uint8_t uid[10];

        uint32_t cuid;
 
        uint32_t cuid;
 

-       tracing = FALSE;
-       byte_t nt[4] = {0,0,0,0};
-       byte_t nt_attacked[4], nt_noattack[4];
+       uint32_t nt, previous_nt;
+       static uint32_t nt_attacked = 0;

        byte_t par_list[8] = {0,0,0,0,0,0,0,0};
        byte_t ks_list[8] = {0,0,0,0,0,0,0,0};
        byte_t par_list[8] = {0,0,0,0,0,0,0,0};
        byte_t ks_list[8] = {0,0,0,0,0,0,0,0};

-       num_to_bytes(parameter, 4, nt_noattack);
-       int isOK = 0, isNULL = 0;

 
 

-       while(TRUE)
-       {
-               LED_C_ON();
-               FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-               SpinDelay(200);
-               FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-               LED_C_OFF();
+       static uint32_t sync_time;
+       static uint32_t sync_cycles;
+       int catch_up_cycles = 0;
+       int last_catch_up = 0;
+       uint16_t consecutive_resyncs = 0;
+       int isOK = 0;
+
+
+
+       if (first_try) { 
+               StartCountMifare();
+               mf_nr_ar3 = 0;
+               iso14443a_setup();
+               while((GetCountMifare() & 0xffff0000) != 0x10000);              // wait for counter to reset and "warm up" 
+               sync_time = GetCountMifare() & 0xfffffff8;
+               sync_cycles = 65536;                                                                    // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces).
+               nt_attacked = 0;
+               nt = 0;
+               par = 0;
+       }
+       else {
+               // we were unsuccessful on a previous call. Try another READER nonce (first 3 parity bits remain the same)
+               // nt_attacked = prng_successor(nt_attacked, 1);
+               mf_nr_ar3++;
+               mf_nr_ar[3] = mf_nr_ar3;
+               par = par_low;
+       }
+
+       LED_A_ON();
+       LED_B_OFF();
+       LED_C_OFF();
+       
+  
+       for(uint16_t i = 0; TRUE; i++) {
+               
+               WDT_HIT();

 
                // Test if the action was cancelled
                if(BUTTON_PRESS()) {
                        break;
                }
 
                // Test if the action was cancelled
                if(BUTTON_PRESS()) {
                        break;
                }

+               
+               LED_C_ON();

 
 

-               if(!iso14443a_select_card(uid, NULL, &cuid)) continue;
+               if(!iso14443a_select_card(uid, NULL, &cuid)) {
+                       if (MF_DBGLEVEL >= 1)   Dbprintf("Mifare: Can't select card");
+                       continue;
+               }

 
 

-               // Transmit MIFARE_CLASSIC_AUTH
-               ReaderTransmit(mf_auth, sizeof(mf_auth));
+               //keep the card active
+               FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);

 
 

-               // Receive the (16 bit) "random" nonce
-               if (!ReaderReceive(receivedAnswer)) continue;
-               memcpy(nt, receivedAnswer, 4);
+               // CodeIso14443aBitsAsReaderPar(mf_auth, sizeof(mf_auth)*8, GetParity(mf_auth, sizeof(mf_auth)*8));

 
 

-               // Transmit reader nonce and reader answer
-               ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar),par);
+               sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles;
+               catch_up_cycles = 0;

 
 

-               // Receive 4 bit answer
-               if (ReaderReceive(receivedAnswer))
-               {
-                       if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue;
+               // if we missed the sync time already, advance to the next nonce repeat
+               while(GetCountMifare() > sync_time) {
+                       sync_time = (sync_time & 0xfffffff8) + sync_cycles;
+               }

 
 

-                       isNULL = (nt_attacked[0] = 0) && (nt_attacked[1] = 0) && (nt_attacked[2] = 0) && (nt_attacked[3] = 0);
-                       if ( (isNULL != 0 ) && (memcmp(nt, nt_attacked, 4) != 0) ) continue;
+               // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked) 
+               ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time);

 
 

+               // Receive the (4 Byte) "random" nonce
+               if (!ReaderReceive(receivedAnswer)) {
+                       if (MF_DBGLEVEL >= 1)   Dbprintf("Mifare: Couldn't receive tag nonce");
+                       continue;
+                 }
+
+               previous_nt = nt;
+               nt = bytes_to_num(receivedAnswer, 4);
+
+               // Transmit reader nonce with fake par
+               ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL);
+
+               if (first_try && previous_nt && !nt_attacked) { // we didn't calibrate our clock yet
+                       int nt_distance = dist_nt(previous_nt, nt);
+                       if (nt_distance == 0) {
+                               nt_attacked = nt;
+                       }
+                       else {
+                               if (nt_distance == -99999) { // invalid nonce received, try again
+                                       continue;
+                               }
+                               sync_cycles = (sync_cycles - nt_distance);
+                               if (MF_DBGLEVEL >= 3) Dbprintf("calibrating in cycle %d. nt_distance=%d, Sync_cycles: %d\n", i, nt_distance, sync_cycles);
+                               continue;
+                       }
+               }
+
+               if ((nt != nt_attacked) && nt_attacked) {       // we somehow lost sync. Try to catch up again...
+                       catch_up_cycles = -dist_nt(nt_attacked, nt);
+                       if (catch_up_cycles == 99999) {                 // invalid nonce received. Don't resync on that one.
+                               catch_up_cycles = 0;
+                               continue;
+                       }
+                       if (catch_up_cycles == last_catch_up) {
+                               consecutive_resyncs++;
+                       }
+                       else {
+                               last_catch_up = catch_up_cycles;
+                           consecutive_resyncs = 0;
+                       }
+                       if (consecutive_resyncs < 3) {
+                               if (MF_DBGLEVEL >= 3) Dbprintf("Lost sync in cycle %d. nt_distance=%d. Consecutive Resyncs = %d. Trying one time catch up...\n", i, -catch_up_cycles, consecutive_resyncs);
+                       }
+                       else {  
+                               sync_cycles = sync_cycles + catch_up_cycles;
+                               if (MF_DBGLEVEL >= 3) Dbprintf("Lost sync in cycle %d for the fourth time consecutively (nt_distance = %d). Adjusting sync_cycles to %d.\n", i, -catch_up_cycles, sync_cycles);
+                       }
+                       continue;
+               }
+ 
+               consecutive_resyncs = 0;
+               
+               // Receive answer. This will be a 4 Bit NACK when the 8 parity bits are OK after decoding
+               if (ReaderReceive(receivedAnswer))
+               {
+                       catch_up_cycles = 8;    // the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer
+       

                        if (nt_diff == 0)
                        {
                        if (nt_diff == 0)
                        {

-                               LED_A_ON();
-                               memcpy(nt_attacked, nt, 4);
-                               par_mask = 0xf8;
-                               par_low = par & 0x07;
+                               par_low = par & 0x07; // there is no need to check all parities for other nt_diff. Parity Bits for mf_nr_ar[0..2] won't change

                        }
 
                        led_on = !led_on;
                        if(led_on) LED_B_ON(); else LED_B_OFF();
                        }
 
                        led_on = !led_on;
                        if(led_on) LED_B_ON(); else LED_B_OFF();

+

                        par_list[nt_diff] = par;
                        ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
 
                        par_list[nt_diff] = par;
                        ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
 


@@ -1955,10 +2064,10 @@ void ReaderMifare(uint32_t parameter)
                        }
 
                        nt_diff = (nt_diff + 1) & 0x07;
                        }
 
                        nt_diff = (nt_diff + 1) & 0x07;

-                       mf_nr_ar[3] = nt_diff << 5;
+                       mf_nr_ar[3] = (mf_nr_ar[3] & 0x1F) | (nt_diff << 5);

                        par = par_low;
                } else {
                        par = par_low;
                } else {

-                       if (nt_diff == 0)
+                       if (nt_diff == 0 && first_try)

                        {
                                par++;
                        } else {
                        {
                                par++;
                        } else {


@@ -1967,723 +2076,144 @@ void ReaderMifare(uint32_t parameter)
                }
        }
 
                }
        }
 

-       LogTrace(nt, 4, 0, GetParity(nt, 4), TRUE);
+       LogTrace((const uint8_t *)&nt, 4, 0, GetParity((const uint8_t *)&nt, 4), TRUE);

        LogTrace(par_list, 8, 0, GetParity(par_list, 8), TRUE);
        LogTrace(ks_list, 8, 0, GetParity(ks_list, 8), TRUE);
 
        LogTrace(par_list, 8, 0, GetParity(par_list, 8), TRUE);
        LogTrace(ks_list, 8, 0, GetParity(ks_list, 8), TRUE);
 

-       UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
-       memcpy(ack.d.asBytes + 0,  uid, 4);
-       memcpy(ack.d.asBytes + 4,  nt, 4);
-       memcpy(ack.d.asBytes + 8,  par_list, 8);
-       memcpy(ack.d.asBytes + 16, ks_list, 8);
+       mf_nr_ar[3] &= 0x1F;
+       
+       byte_t buf[28];
+       memcpy(buf + 0,  uid, 4);
+       num_to_bytes(nt, 4, buf + 4);
+       memcpy(buf + 8,  par_list, 8);
+       memcpy(buf + 16, ks_list, 8);
+       memcpy(buf + 24, mf_nr_ar, 4);

                
                

-       LED_B_ON();
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();    
+       cmd_send(CMD_ACK,isOK,0,0,buf,28);

 
        // Thats it...
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        LEDsoff();
        tracing = TRUE;
 
        // Thats it...
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        LEDsoff();
        tracing = TRUE;

-       
-       if (MF_DBGLEVEL >= 1)   DbpString("COMMAND mifare FINISHED");

 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------

-// Select, Authenticaate, Read an MIFARE tag. 
-// read block
+// MIFARE 1K simulate. 
+// 

 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------

-void MifareReadBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
+void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)

 {
 {

-  // params
-       uint8_t blockNo = arg0;
-       uint8_t keyType = arg1;
-       uint64_t ui64Key = 0;
-       ui64Key = bytes_to_num(datain, 6);
-       
-       // variables
-       byte_t isOK = 0;
-       byte_t dataoutbuf[16];
-       uint8_t uid[8];
-       uint32_t cuid;
+       int cardSTATE = MFEMUL_NOFIELD;
+       int _7BUID = 0;
+       int vHf = 0;    // in mV
+       //int nextCycleTimeout = 0;
+       int res;
+//     uint32_t timer = 0;
+       uint32_t selTimer = 0;
+       uint32_t authTimer = 0;
+       uint32_t par = 0;
+       int len = 0;
+       uint8_t cardWRBL = 0;
+       uint8_t cardAUTHSC = 0;
+       uint8_t cardAUTHKEY = 0xff;  // no authentication
+       //uint32_t cardRn = 0;
+       uint32_t cardRr = 0;
+       uint32_t cuid = 0;
+       //uint32_t rn_enc = 0;
+       uint32_t ans = 0;
+       uint32_t cardINTREG = 0;
+       uint8_t cardINTBLOCK = 0;

        struct Crypto1State mpcs = {0, 0};
        struct Crypto1State *pcs;
        pcs = &mpcs;
        struct Crypto1State mpcs = {0, 0};
        struct Crypto1State *pcs;
        pcs = &mpcs;

-
-       // clear trace
-       traceLen = 0;
-//     tracing = false;
-
-       iso14443a_setup();
-
-       LED_A_ON();
-       LED_B_OFF();
-       LED_C_OFF();
-
-       while (true) {
-               if(!iso14443a_select_card(uid, NULL, &cuid)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
-                       break;
-               };
-
-               if(mifare_classic_auth(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Auth error");
-                       break;
-               };
-               
-               if(mifare_classic_readblock(pcs, cuid, blockNo, dataoutbuf)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Read block error");
-                       break;
-               };
-
-               if(mifare_classic_halt(pcs, cuid)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Halt error");
-                       break;
-               };
-               
-               isOK = 1;
-               break;
-       }
-       
-       //  ----------------------------- crypto1 destroy
-       crypto1_destroy(pcs);

        
        

-       if (MF_DBGLEVEL >= 2)   DbpString("READ BLOCK FINISHED");
-
-       // add trace trailer
-       memset(uid, 0x44, 4);
-       LogTrace(uid, 4, 0, 0, TRUE);
-
-       UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
-       memcpy(ack.d.asBytes, dataoutbuf, 16);
+       uint8_t* receivedCmd = eml_get_bigbufptr_recbuf();
+       uint8_t *response = eml_get_bigbufptr_sendbuf();

        
        

-       LED_B_ON();
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();
+       static uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID

 
 

+       static uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; 
+       static uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!!
+               
+       static uint8_t rSAK[] = {0x08, 0xb6, 0xdd};
+       static uint8_t rSAK1[] = {0x04, 0xda, 0x17};

 
 

-  // Thats it...
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       LEDsoff();
-//  tracing = TRUE;
+       static uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04};
+//     static uint8_t rAUTH_NT[] = {0x1a, 0xac, 0xff, 0x4f};
+       static uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};

 
 

-}
+       // clear trace
+       traceLen = 0;
+       tracing = true;

 
 

-//-----------------------------------------------------------------------------
-// Select, Authenticaate, Read an MIFARE tag. 
-// read sector (data = 4 x 16 bytes = 64 bytes)
-//-----------------------------------------------------------------------------
-void MifareReadSector(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
-{
-  // params
-       uint8_t sectorNo = arg0;
-       uint8_t keyType = arg1;
-       uint64_t ui64Key = 0;
-       ui64Key = bytes_to_num(datain, 6);
+  // Authenticate response - nonce
+       uint32_t nonce = bytes_to_num(rAUTH_NT, 4);

        
        

-       // variables
-       byte_t isOK = 0;
-       byte_t dataoutbuf[16 * 4];
-       uint8_t uid[8];
-       uint32_t cuid;
-       struct Crypto1State mpcs = {0, 0};
-       struct Crypto1State *pcs;
-       pcs = &mpcs;
+       // get UID from emul memory
+       emlGetMemBt(receivedCmd, 7, 1);
+       _7BUID = !(receivedCmd[0] == 0x00);
+       if (!_7BUID) {                     // ---------- 4BUID
+               rATQA[0] = 0x04;
+
+               emlGetMemBt(rUIDBCC1, 0, 4);
+               rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
+       } else {                           // ---------- 7BUID
+               rATQA[0] = 0x44;
+
+               rUIDBCC1[0] = 0x88;
+               emlGetMemBt(&rUIDBCC1[1], 0, 3);
+               rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
+               emlGetMemBt(rUIDBCC2, 3, 4);
+               rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
+       }

 
 

-       // clear trace
-       traceLen = 0;
-//     tracing = false;
+// --------------------------------------      test area

 
 

-       iso14443a_setup();
+// --------------------------------------      END test area
+       // start mkseconds counter
+       StartCountUS();

 
 

-       LED_A_ON();
-       LED_B_OFF();
-       LED_C_OFF();
+       // We need to listen to the high-frequency, peak-detected path.
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+       FpgaSetupSsc();
+
+  FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+       SpinDelay(200);

 
 

+       if (MF_DBGLEVEL >= 1)   Dbprintf("Started. 7buid=%d", _7BUID);
+       // calibrate mkseconds counter
+       GetDeltaCountUS();

        while (true) {
        while (true) {

-               if(!iso14443a_select_card(uid, NULL, &cuid)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
-                       break;
-               };
+               WDT_HIT();

 
 

-               if(mifare_classic_auth(pcs, cuid, sectorNo * 4, keyType, ui64Key, AUTH_FIRST)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Auth error");
+               if(BUTTON_PRESS()) {

                        break;
                        break;

-               };
+               }
+
+               // find reader field
+               // Vref = 3300mV, and an 10:1 voltage divider on the input
+               // can measure voltages up to 33000 mV
+               if (cardSTATE == MFEMUL_NOFIELD) {
+                       vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10;
+                       if (vHf > MF_MINFIELDV) {
+                               cardSTATE_TO_IDLE();
+                               LED_A_ON();
+                       }
+               } 
+
+               if (cardSTATE != MFEMUL_NOFIELD) {
+                       res = EmGetCmd(receivedCmd, &len, RECV_CMD_SIZE); // (+ nextCycleTimeout)
+                       if (res == 2) {
+                               cardSTATE = MFEMUL_NOFIELD;
+                               LEDsoff();
+                               continue;
+                       }
+                       if(res) break;
+               }

                
                

-               if(mifare_classic_readblock(pcs, cuid, sectorNo * 4 + 0, dataoutbuf + 16 * 0)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Read block 0 error");
-                       break;
-               };
-               if(mifare_classic_readblock(pcs, cuid, sectorNo * 4 + 1, dataoutbuf + 16 * 1)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Read block 1 error");
-                       break;
-               };
-               if(mifare_classic_readblock(pcs, cuid, sectorNo * 4 + 2, dataoutbuf + 16 * 2)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Read block 2 error");
-                       break;
-               };
-               if(mifare_classic_readblock(pcs, cuid, sectorNo * 4 + 3, dataoutbuf + 16 * 3)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Read block 3 error");
-                       break;
-               };
+               //nextCycleTimeout = 0;

                
                

-               if(mifare_classic_halt(pcs, cuid)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Halt error");
-                       break;
-               };
-
-               isOK = 1;
-               break;
-       }
-       
-       //  ----------------------------- crypto1 destroy
-       crypto1_destroy(pcs);
-       
-       if (MF_DBGLEVEL >= 2) DbpString("READ SECTOR FINISHED");
-
-       // add trace trailer
-       memset(uid, 0x44, 4);
-       LogTrace(uid, 4, 0, 0, TRUE);
-
-       UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
-       memcpy(ack.d.asBytes, dataoutbuf, 16 * 2);
-       
-       LED_B_ON();
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-
-       SpinDelay(100);
-       
-       memcpy(ack.d.asBytes, dataoutbuf + 16 * 2, 16 * 2);
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();    
-
-       // Thats it...
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       LEDsoff();
-//  tracing = TRUE;
-
-}
-
-//-----------------------------------------------------------------------------
-// Select, Authenticaate, Read an MIFARE tag. 
-// read block
-//-----------------------------------------------------------------------------
-void MifareWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
-{
-       // params
-       uint8_t blockNo = arg0;
-       uint8_t keyType = arg1;
-       uint64_t ui64Key = 0;
-       byte_t blockdata[16];
-
-       ui64Key = bytes_to_num(datain, 6);
-       memcpy(blockdata, datain + 10, 16);
-       
-       // variables
-       byte_t isOK = 0;
-       uint8_t uid[8];
-       uint32_t cuid;
-       struct Crypto1State mpcs = {0, 0};
-       struct Crypto1State *pcs;
-       pcs = &mpcs;
-
-       // clear trace
-       traceLen = 0;
-//  tracing = false;
-
-       iso14443a_setup();
-
-       LED_A_ON();
-       LED_B_OFF();
-       LED_C_OFF();
-
-       while (true) {
-                       if(!iso14443a_select_card(uid, NULL, &cuid)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
-                       break;
-               };
-
-               if(mifare_classic_auth(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Auth error");
-                       break;
-               };
-               
-               if(mifare_classic_writeblock(pcs, cuid, blockNo, blockdata)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Write block error");
-                       break;
-               };
-
-               if(mifare_classic_halt(pcs, cuid)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Halt error");
-                       break;
-               };
-               
-               isOK = 1;
-               break;
-       }
-       
-       //  ----------------------------- crypto1 destroy
-       crypto1_destroy(pcs);
-       
-       if (MF_DBGLEVEL >= 2)   DbpString("WRITE BLOCK FINISHED");
-
-       // add trace trailer
-       memset(uid, 0x44, 4);
-       LogTrace(uid, 4, 0, 0, TRUE);
-
-       UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
-       
-       LED_B_ON();
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();    
-
-
-       // Thats it...
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       LEDsoff();
-//  tracing = TRUE;
-
-}
-
-// Return 1 if the nonce is invalid else return 0
-int valid_nonce(uint32_t Nt, uint32_t NtEnc, uint32_t Ks1, byte_t * parity) {
-       return ((oddparity((Nt >> 24) & 0xFF) == ((parity[0]) ^ oddparity((NtEnc >> 24) & 0xFF) ^ BIT(Ks1,16))) & \
-       (oddparity((Nt >> 16) & 0xFF) == ((parity[1]) ^ oddparity((NtEnc >> 16) & 0xFF) ^ BIT(Ks1,8))) & \
-       (oddparity((Nt >> 8) & 0xFF) == ((parity[2]) ^ oddparity((NtEnc >> 8) & 0xFF) ^ BIT(Ks1,0)))) ? 1 : 0;
-}
-
-
-//-----------------------------------------------------------------------------
-// MIFARE nested authentication. 
-// 
-//-----------------------------------------------------------------------------
-void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)
-{
-       // params
-       uint8_t blockNo = arg0;
-       uint8_t keyType = arg1;
-       uint8_t targetBlockNo = arg2 & 0xff;
-       uint8_t targetKeyType = (arg2 >> 8) & 0xff;
-       uint64_t ui64Key = 0;
-
-       ui64Key = bytes_to_num(datain, 6);
-       
-       // variables
-       int rtr, i, j, m, len;
-       int davg, dmin, dmax;
-       uint8_t uid[8];
-       uint32_t cuid, nt1, nt2, nttmp, nttest, par, ks1;
-       uint8_t par_array[4];
-       nestedVector nvector[NES_MAX_INFO + 1][10];
-       int nvectorcount[NES_MAX_INFO + 1];
-       int ncount = 0;
-       UsbCommand ack = {CMD_ACK, {0, 0, 0}};
-       struct Crypto1State mpcs = {0, 0};
-       struct Crypto1State *pcs;
-       pcs = &mpcs;
-       uint8_t* receivedAnswer = mifare_get_bigbufptr();
-
-       //init
-       for (i = 0; i < NES_MAX_INFO + 1; i++) nvectorcount[i] = 11;  //  11 - empty block;
-       
-       // clear trace
-       traceLen = 0;
-  tracing = false;
-       
-       iso14443a_setup();
-
-       LED_A_ON();
-       LED_B_ON();
-       LED_C_OFF();
-
-  FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-  SpinDelay(200);
-       
-       davg = dmax = 0;
-       dmin = 2000;
-
-       // test nonce distance
-       for (rtr = 0; rtr < 10; rtr++) {
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-    SpinDelay(100);
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-
-    // Test if the action was cancelled
-    if(BUTTON_PRESS()) {
-      break;
-    }
-
-               if(!iso14443a_select_card(uid, NULL, &cuid)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
-                       break;
-               };
-               
-               if(mifare_classic_authex(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST, &nt1)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Auth1 error");
-                       break;
-               };
-
-               if(mifare_classic_authex(pcs, cuid, blockNo, keyType, ui64Key, AUTH_NESTED, &nt2)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Auth2 error");
-                       break;
-               };
-               
-               nttmp = prng_successor(nt1, 500);
-               for (i = 501; i < 2000; i++) {
-                       nttmp = prng_successor(nttmp, 1);
-                       if (nttmp == nt2) break;
-               }
-               
-               if (i != 2000) {
-                       davg += i;
-                       if (dmin > i) dmin = i;
-                       if (dmax < i) dmax = i;
-                       if (MF_DBGLEVEL >= 4)   Dbprintf("r=%d nt1=%08x nt2=%08x distance=%d", rtr, nt1, nt2, i);
-               }
-       }
-       
-       if (rtr == 0)   return;
-
-       davg = davg / rtr;
-       if (MF_DBGLEVEL >= 3)   Dbprintf("distance: min=%d max=%d avg=%d", dmin, dmax, davg);
-
-       LED_B_OFF();
-
-//  -------------------------------------------------------------------------------------------------  
-       
-       LED_C_ON();
-
-       //  get crypted nonces for target sector
-       for (rtr = 0; rtr < NS_RETRIES_GETNONCE; rtr++) {
-       if (MF_DBGLEVEL >= 4)                   Dbprintf("------------------------------");
-
-               FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-    SpinDelay(100);
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-
-    // Test if the action was cancelled
-    if(BUTTON_PRESS()) {
-      break;
-    }
-
-               if(!iso14443a_select_card(uid, NULL, &cuid)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
-                       break;
-               };
-               
-               if(mifare_classic_authex(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST, &nt1)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Auth1 error");
-                       break;
-               };
-
-               // nested authentication
-               len = mifare_sendcmd_shortex(pcs, AUTH_NESTED, 0x60 + (targetKeyType & 0x01), targetBlockNo, receivedAnswer, &par);
-               if (len != 4) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Auth2 error len=%d", len);
-                       break;
-               };
-       
-               nt2 = bytes_to_num(receivedAnswer, 4);          
-               if (MF_DBGLEVEL >= 4)   Dbprintf("r=%d nt1=%08x nt2enc=%08x nt2par=%08x", rtr, nt1, nt2, par);
-               
-               // Parity validity check
-               for (i = 0; i < 4; i++) {
-                       par_array[i] = (oddparity(receivedAnswer[i]) != ((par & 0x08) >> 3));
-                       par = par << 1;
-               }
-               
-               ncount = 0;
-               for (m = dmin - NS_TOLERANCE; m < dmax + NS_TOLERANCE; m++) {
-                       nttest = prng_successor(nt1, m);
-                       ks1 = nt2 ^ nttest;
-
-                       if (valid_nonce(nttest, nt2, ks1, par_array) && (ncount < 11)){
-                               
-                               nvector[NES_MAX_INFO][ncount].nt = nttest;
-                               nvector[NES_MAX_INFO][ncount].ks1 = ks1;
-                               ncount++;
-                               nvectorcount[NES_MAX_INFO] = ncount;
-                               if (MF_DBGLEVEL >= 4)   Dbprintf("valid m=%d ks1=%08x nttest=%08x", m, ks1, nttest);
-                       }
-
-               }
-               
-               // select vector with length less than got
-               if (nvectorcount[NES_MAX_INFO] != 0) {
-                       m = NES_MAX_INFO;
-                       
-                       for (i = 0; i < NES_MAX_INFO; i++)
-                               if (nvectorcount[i] > 10) {
-                                       m = i;
-                                       break;
-                               }
-                               
-                       if (m == NES_MAX_INFO)
-                               for (i = 0; i < NES_MAX_INFO; i++)
-                                       if (nvectorcount[NES_MAX_INFO] < nvectorcount[i]) {
-                                               m = i;
-                                               break;
-                                       }
-                                       
-                       if (m != NES_MAX_INFO) {
-                               for (i = 0; i < nvectorcount[m]; i++) {
-                                       nvector[m][i] = nvector[NES_MAX_INFO][i];
-                               }
-                               nvectorcount[m] = nvectorcount[NES_MAX_INFO];
-                       }
-               }
-       }
-
-       LED_C_OFF();
-       
-       //  ----------------------------- crypto1 destroy
-       crypto1_destroy(pcs);
-       
-       // add trace trailer
-       memset(uid, 0x44, 4);
-       LogTrace(uid, 4, 0, 0, TRUE);
-
-       for (i = 0; i < NES_MAX_INFO; i++) {
-               if (nvectorcount[i] > 10) continue;
-               
-               for (j = 0; j < nvectorcount[i]; j += 5) {
-                       ncount = nvectorcount[i] - j;
-                       if (ncount > 5) ncount = 5; 
-
-                       ack.arg[0] = 0; // isEOF = 0
-                       ack.arg[1] = ncount;
-                       ack.arg[2] = targetBlockNo + (targetKeyType * 0x100);
-                       memset(ack.d.asBytes, 0x00, sizeof(ack.d.asBytes));
-                       
-                       memcpy(ack.d.asBytes, &cuid, 4);
-                       for (m = 0; m < ncount; m++) {
-                               memcpy(ack.d.asBytes + 8 + m * 8 + 0, &nvector[i][m + j].nt, 4);
-                               memcpy(ack.d.asBytes + 8 + m * 8 + 4, &nvector[i][m + j].ks1, 4);
-                       }
-       
-                       LED_B_ON();
-                       SpinDelay(100);
-                       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-                       LED_B_OFF();    
-               }
-       }
-
-       // finalize list
-       ack.arg[0] = 1; // isEOF = 1
-       ack.arg[1] = 0;
-       ack.arg[2] = 0;
-       memset(ack.d.asBytes, 0x00, sizeof(ack.d.asBytes));
-       
-       LED_B_ON();
-       SpinDelay(300);
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();    
-
-       if (MF_DBGLEVEL >= 4)   DbpString("NESTED FINISHED");
-
-       // Thats it...
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       LEDsoff();
-       
-  tracing = TRUE;
-}
-
-//-----------------------------------------------------------------------------
-// MIFARE check keys. key count up to 8. 
-// 
-//-----------------------------------------------------------------------------
-void MifareChkKeys(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
-{
-  // params
-       uint8_t blockNo = arg0;
-       uint8_t keyType = arg1;
-       uint8_t keyCount = arg2;
-       uint64_t ui64Key = 0;
-       
-       // variables
-       int i;
-       byte_t isOK = 0;
-       uint8_t uid[8];
-       uint32_t cuid;
-       struct Crypto1State mpcs = {0, 0};
-       struct Crypto1State *pcs;
-       pcs = &mpcs;
-       
-       // clear debug level
-       int OLD_MF_DBGLEVEL = MF_DBGLEVEL;      
-       MF_DBGLEVEL = MF_DBG_NONE;
-       
-       // clear trace
-       traceLen = 0;
-  tracing = TRUE;
-
-       iso14443a_setup();
-
-       LED_A_ON();
-       LED_B_OFF();
-       LED_C_OFF();
-
-       SpinDelay(300);
-       for (i = 0; i < keyCount; i++) {
-               FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-    SpinDelay(100);
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-
-               if(!iso14443a_select_card(uid, NULL, &cuid)) {
-                       if (OLD_MF_DBGLEVEL >= 1)       Dbprintf("Can't select card");
-                       break;
-               };
-
-               ui64Key = bytes_to_num(datain + i * 6, 6);
-               if(mifare_classic_auth(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST)) {
-                       continue;
-               };
-               
-               isOK = 1;
-               break;
-       }
-       
-       //  ----------------------------- crypto1 destroy
-       crypto1_destroy(pcs);
-       
-       // add trace trailer
-       memset(uid, 0x44, 4);
-       LogTrace(uid, 4, 0, 0, TRUE);
-
-       UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
-       if (isOK) memcpy(ack.d.asBytes, datain + i * 6, 6);
-       
-       LED_B_ON();
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();
-
-  // Thats it...
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       LEDsoff();
-
-       // restore debug level
-       MF_DBGLEVEL = OLD_MF_DBGLEVEL;  
-}
-
-//-----------------------------------------------------------------------------
-// MIFARE 1K simulate. 
-// 
-//-----------------------------------------------------------------------------
-void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
-{
-       int cardSTATE = MFEMUL_NOFIELD;
-       int vHf = 0;    // in mV
-       int nextCycleTimeout = 0;
-       int res;
-       uint32_t timer = 0;
-       uint32_t selTimer = 0;
-       uint32_t authTimer = 0;
-       uint32_t par = 0;
-       int len = 0;
-       uint8_t cardWRBL = 0;
-       uint8_t cardAUTHSC = 0;
-       uint8_t cardAUTHKEY = 0xff;  // no authentication
-       uint32_t cuid = 0;
-       struct Crypto1State mpcs = {0, 0};
-       struct Crypto1State *pcs;
-       pcs = &mpcs;
-       
-       uint64_t key64 = 0xffffffffffffULL;
-       
-       uint8_t* receivedCmd = eml_get_bigbufptr_recbuf();
-       uint8_t *response = eml_get_bigbufptr_sendbuf();
-       
-       static uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k
-
-       static uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; 
-       static uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!!
-               
-       static uint8_t rSAK[] = {0x08, 0xb6, 0xdd};
-
-       static uint8_t rAUTH_NT[] = {0x1a, 0xac, 0xff, 0x4f};
-       static uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
-       
-       // clear trace
-       traceLen = 0;
-       tracing = true;
-       
-       // emulator memory
-       emlClearMem();
-       emlGetMemBt(rUIDBCC1, 0, 4);
-       rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
-       
-// --------------------------------------      test area
-
-   // Authenticate response - nonce
-    uint8_t *resp1 = (((uint8_t *)BigBuf) + EML_RESPONSES);
-    int resp1Len;
-//    uint8_t *resp2 = (((uint8_t *)BigBuf) + EML_RESPONSES + 200);
-//    int resp2Len;
-       CodeIso14443aAsTag(rAUTH_NT, sizeof(rAUTH_NT));
-    memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
-               
-       timer = GetTickCount();
-       uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
-       uint32_t rn_enc = 0x98d76b77; // !!!!!!!!!!!!!!!!!
-       uint32_t ans = 0;
-       cuid = bytes_to_num(rUIDBCC1, 4);
-/*     
-       crypto1_create(pcs, key64);
-  crypto1_word(pcs, cuid ^ nonce, 0);
-  crypto1_word(pcs, rn_enc , 1);
-  crypto1_word(pcs, 0, 0);
-  ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
-       num_to_bytes(ans, 4, rAUTH_AT);
-       CodeIso14443aAsTag(rAUTH_AT, sizeof(rAUTH_AT));
-  memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
-       Dbprintf("crypto auth time: %d", GetTickCount() - timer);
-*/
-// --------------------------------------      END test area
-       // start mkseconds counter
-       StartCountUS();
-
-       // We need to listen to the high-frequency, peak-detected path.
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-       FpgaSetupSsc();
-
-  FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
-       SpinDelay(200);
-
-       Dbprintf("--> start");
-       // calibrate mkseconds counter
-       GetDeltaCountUS();
-       while (true) {
-               WDT_HIT();
-
-               if(BUTTON_PRESS()) {
-                       break;
-               }
-
-               // find reader field
-               // Vref = 3300mV, and an 10:1 voltage divider on the input
-               // can measure voltages up to 33000 mV
-               if (cardSTATE == MFEMUL_NOFIELD) {
-                       vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10;
-                       if (vHf > MF_MINFIELDV) {
-                               cardSTATE = MFEMUL_IDLE;
-                               LED_A_ON();
-                       }
-               } 
-
-               if (cardSTATE != MFEMUL_NOFIELD) {
-                       res = EmGetCmd(receivedCmd, &len, 100); // (+ nextCycleTimeout)
-                       if (res == 2) {
-                               cardSTATE = MFEMUL_NOFIELD;
-                               LEDsoff();
-                               continue;
-                       }
-                       if(res) break;
-               }
-               
-               nextCycleTimeout = 0;
-               
-//             if (len) Dbprintf("len:%d cmd: %02x %02x %02x %02x", len, receivedCmd[0], receivedCmd[1], receivedCmd[2], receivedCmd[3]);
+//             if (len) Dbprintf("len:%d cmd: %02x %02x %02x %02x", len, receivedCmd[0], receivedCmd[1], receivedCmd[2], receivedCmd[3]);

 
                if (len != 4 && cardSTATE != MFEMUL_NOFIELD) { // len != 4 <---- speed up the code 4 authentication
                        // REQ or WUP request in ANY state and WUP in HALTED state
 
                if (len != 4 && cardSTATE != MFEMUL_NOFIELD) { // len != 4 <---- speed up the code 4 authentication
                        // REQ or WUP request in ANY state and WUP in HALTED state


@@ -2714,86 +2244,133 @@ void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
                                // select all
                                if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) {
                                        EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1));
                                // select all
                                if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) {
                                        EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1));

-
-                                       if (rUIDBCC1[0] == 0x88) {
-                                               cardSTATE = MFEMUL_SELECT2;
-                                       }
+                                       break;

                                }
 
                                // select card
                                if (len == 9 && 
                                                (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) {
                                }
 
                                // select card
                                if (len == 9 && 
                                                (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) {

-                                       EmSendCmd(rSAK, sizeof(rSAK));
+                                       if (!_7BUID) 
+                                               EmSendCmd(rSAK, sizeof(rSAK));
+                                       else
+                                               EmSendCmd(rSAK1, sizeof(rSAK1));

 
                                        cuid = bytes_to_num(rUIDBCC1, 4);
 
                                        cuid = bytes_to_num(rUIDBCC1, 4);

-                                       cardSTATE = MFEMUL_WORK;
-                                       LED_B_ON();
-                                       Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer);
+                                       if (!_7BUID) {
+                                               cardSTATE = MFEMUL_WORK;
+                                               LED_B_ON();
+                                               if (MF_DBGLEVEL >= 4)   Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer);
+                                               break;
+                                       } else {
+                                               cardSTATE = MFEMUL_SELECT2;
+                                               break;
+                                       }

                                }
                                
                                break;
                        }
                        case MFEMUL_SELECT2:{
                                }
                                
                                break;
                        }
                        case MFEMUL_SELECT2:{

+                               if (!len) break;
+                       
+                               if (len == 2 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x20)) {

                                        EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2));
                                        EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2));

+                                       break;
+                               }
+
+                               // select 2 card
+                               if (len == 9 && 
+                                               (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0)) {
+                                       EmSendCmd(rSAK, sizeof(rSAK));

 
 

-                               cuid = bytes_to_num(rUIDBCC2, 4);
+                                       cuid = bytes_to_num(rUIDBCC2, 4);
+                                       cardSTATE = MFEMUL_WORK;
+                                       LED_B_ON();
+                                       if (MF_DBGLEVEL >= 4)   Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer);
+                                       break;
+                               }
+                               
+                               // i guess there is a command). go into the work state.
+                               if (len != 4) break;

                                cardSTATE = MFEMUL_WORK;
                                cardSTATE = MFEMUL_WORK;

-                               LED_B_ON();
-Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer);
-                               break;
+                               goto lbWORK;

                        }
                        case MFEMUL_AUTH1:{
                                if (len == 8) {
                        }
                        case MFEMUL_AUTH1:{
                                if (len == 8) {

-// ---------------------------------
-       rn_enc = bytes_to_num(receivedCmd, 4);
-       crypto1_create(pcs, key64);
-  crypto1_word(pcs, cuid ^ nonce, 0);
-  crypto1_word(pcs, rn_enc , 1);
-  crypto1_word(pcs, 0, 0);
-  ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
-       num_to_bytes(ans, 4, rAUTH_AT);
-// ---------------------------------
-                               EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
+                                       // --- crypto
+                                       //rn_enc = bytes_to_num(receivedCmd, 4);
+                                       //cardRn = rn_enc ^ crypto1_word(pcs, rn_enc , 1);
+                                       cardRr = bytes_to_num(&receivedCmd[4], 4) ^ crypto1_word(pcs, 0, 0);
+                                       // test if auth OK
+                                       if (cardRr != prng_successor(nonce, 64)){
+                                               if (MF_DBGLEVEL >= 4)   Dbprintf("AUTH FAILED. cardRr=%08x, succ=%08x", cardRr, prng_successor(nonce, 64));
+                                               cardSTATE_TO_IDLE();
+                                               break;
+                                       }
+                                       ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
+                                       num_to_bytes(ans, 4, rAUTH_AT);
+                                       // --- crypto
+                                       EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));

                                        cardSTATE = MFEMUL_AUTH2;
                                } else {
                                        cardSTATE = MFEMUL_AUTH2;
                                } else {

-                                       cardSTATE = MFEMUL_IDLE;
-                                       LED_B_OFF();
-                                       LED_C_OFF();
+                                       cardSTATE_TO_IDLE();

                                }
                                if (cardSTATE != MFEMUL_AUTH2) break;
                        }
                        case MFEMUL_AUTH2:{
                                }
                                if (cardSTATE != MFEMUL_AUTH2) break;
                        }
                        case MFEMUL_AUTH2:{

-                               // test auth info here...
-

                                LED_C_ON();
                                cardSTATE = MFEMUL_WORK;
                                LED_C_ON();
                                cardSTATE = MFEMUL_WORK;

-Dbprintf("AUTH COMPLETED. sec=%d, key=%d time=%d", cardAUTHSC, cardAUTHKEY, GetTickCount() - authTimer);
+                               if (MF_DBGLEVEL >= 4)   Dbprintf("AUTH COMPLETED. sec=%d, key=%d time=%d", cardAUTHSC, cardAUTHKEY, GetTickCount() - authTimer);

                                break;
                        }
                        case MFEMUL_WORK:{
                                break;
                        }
                        case MFEMUL_WORK:{

-                               // auth
-                               if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
-authTimer = GetTickCount();
-//                                     EmSendCmd(rAUTH_NT, sizeof(rAUTH_NT));
-                                       EmSendCmd14443aRaw(resp1, resp1Len, 0);
-LogTrace(NULL, 0, GetDeltaCountUS(), 0, TRUE);
-//                                     crypto1_create(pcs, key64);
-//                                     if (cardAUTHKEY == 0xff) { // first auth
-//                                     crypto1_word(pcs, cuid ^ bytes_to_num(rAUTH_NT, 4), 0); // uid ^ nonce
-//                                     } else { // nested auth
-//                                     }
-
-                                       cardAUTHSC = receivedCmd[1] / 4;  // received block num
-                                       cardAUTHKEY = receivedCmd[0] - 0x60;
-                                       cardSTATE = MFEMUL_AUTH1;
-                                       nextCycleTimeout = 10;
-                                       break;
-                               }
-                               
-                               if (len == 0) break;
+lbWORK:        if (len == 0) break;

                                
                                

-                               // decrypt seqence
-                               if (cardAUTHKEY != 0xff) mf_crypto1_decrypt(pcs, receivedCmd, len);
+                               if (cardAUTHKEY == 0xff) {
+                                       // first authentication
+                                       if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
+                                               authTimer = GetTickCount();
+
+                                               cardAUTHSC = receivedCmd[1] / 4;  // received block num
+                                               cardAUTHKEY = receivedCmd[0] - 0x60;
+
+                                               // --- crypto
+                                               crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
+                                               ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); 
+                                               num_to_bytes(nonce, 4, rAUTH_AT);
+                                               EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
+                                               // --- crypto
+                                               
+//   last working revision 
+//                                             EmSendCmd14443aRaw(resp1, resp1Len, 0);
+//                                             LogTrace(NULL, 0, GetDeltaCountUS(), 0, true);
+
+                                               cardSTATE = MFEMUL_AUTH1;
+                                               //nextCycleTimeout = 10;
+                                               break;
+                                       }
+                               } else {
+                                       // decrypt seqence
+                                       mf_crypto1_decrypt(pcs, receivedCmd, len);
+                                       
+                                       // nested authentication
+                                       if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
+                                               authTimer = GetTickCount();
+
+                                               cardAUTHSC = receivedCmd[1] / 4;  // received block num
+                                               cardAUTHKEY = receivedCmd[0] - 0x60;
+
+                                               // --- crypto
+                                               crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
+                                               ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); 
+                                               num_to_bytes(ans, 4, rAUTH_AT);
+                                               EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
+                                               // --- crypto
+
+                                               cardSTATE = MFEMUL_AUTH1;
+                                               //nextCycleTimeout = 10;
+                                               break;
+                                       }
+                               }

                                
                                // rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued
                                // BUT... ACK --> NACK
                                
                                // rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued
                                // BUT... ACK --> NACK


@@ -2810,7 +2387,7 @@ LogTrace(NULL, 0, GetDeltaCountUS(), 0, TRUE);
                                
                                // read block
                                if (len == 4 && receivedCmd[0] == 0x30) {
                                
                                // read block
                                if (len == 4 && receivedCmd[0] == 0x30) {

-                                       if (receivedCmd[1] >= 16 * 4) {
+                                       if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {

                                                EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
                                                break;
                                        }
                                                EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
                                                break;
                                        }


@@ -2823,32 +2400,72 @@ LogTrace(NULL, 0, GetDeltaCountUS(), 0, TRUE);
                                
                                // write block
                                if (len == 4 && receivedCmd[0] == 0xA0) {
                                
                                // write block
                                if (len == 4 && receivedCmd[0] == 0xA0) {

-                                       if (receivedCmd[1] >= 16 * 4) {
+                                       if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {

                                                EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
                                                break;
                                        }
                                        EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
                                                EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
                                                break;
                                        }
                                        EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));

-                                       nextCycleTimeout = 50;
+                                       //nextCycleTimeout = 50;

                                        cardSTATE = MFEMUL_WRITEBL2;
                                        cardWRBL = receivedCmd[1];
                                        break;
                                }
                        
                                        cardSTATE = MFEMUL_WRITEBL2;
                                        cardWRBL = receivedCmd[1];
                                        break;
                                }
                        

+                               // works with cardINTREG
+                               
+                               // increment, decrement, restore
+                               if (len == 4 && (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2)) {
+                                       if (receivedCmd[1] >= 16 * 4 || 
+                                                       receivedCmd[1] / 4 != cardAUTHSC || 
+                                                       emlCheckValBl(receivedCmd[1])) {
+                                               EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                               break;
+                                       }
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+                                       if (receivedCmd[0] == 0xC1)
+                                               cardSTATE = MFEMUL_INTREG_INC;
+                                       if (receivedCmd[0] == 0xC0)
+                                               cardSTATE = MFEMUL_INTREG_DEC;
+                                       if (receivedCmd[0] == 0xC2)
+                                               cardSTATE = MFEMUL_INTREG_REST;
+                                       cardWRBL = receivedCmd[1];
+                                       
+                                       break;
+                               }
+                               
+
+                               // transfer
+                               if (len == 4 && receivedCmd[0] == 0xB0) {
+                                       if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {
+                                               EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                               break;
+                                       }
+                                       
+                                       if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1]))
+                                               EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                       else
+                                               EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+                                               
+                                       break;
+                               }
+

                                // halt
                                if (len == 4 && (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00)) {
                                // halt
                                if (len == 4 && (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00)) {

-                                       cardSTATE = MFEMUL_HALTED;

                                        LED_B_OFF();
                                        LED_C_OFF();
                                        LED_B_OFF();
                                        LED_C_OFF();

-                                       Dbprintf("--> HALTED. Selected time: %d ms",  GetTickCount() - selTimer);
+                                       cardSTATE = MFEMUL_HALTED;
+                                       if (MF_DBGLEVEL >= 4)   Dbprintf("--> HALTED. Selected time: %d ms",  GetTickCount() - selTimer);

                                        break;
                                }
                                        break;
                                }

-                               break;
-
+                               

                                // command not allowed
                                if (len == 4) {
                                        EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
                                        break;
                                }
                                // command not allowed
                                if (len == 4) {
                                        EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
                                        break;
                                }

+
+                               // case break
+                               break;

                        }
                        case MFEMUL_WRITEBL2:{
                                if (len == 18){
                        }
                        case MFEMUL_WRITEBL2:{
                                if (len == 18){


@@ -2857,13 +2474,49 @@ LogTrace(NULL, 0, GetDeltaCountUS(), 0, TRUE);
                                        EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
                                        cardSTATE = MFEMUL_WORK;
                                        break;
                                        EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
                                        cardSTATE = MFEMUL_WORK;
                                        break;

+                               } else {
+                                       cardSTATE_TO_IDLE();
+                                       break;

                                }
                                }

-Dbprintf("err write block: %d len:%d", cardWRBL, len);

                                break;
                        }
                                break;
                        }

-               
+                       
+                       case MFEMUL_INTREG_INC:{
+                               mf_crypto1_decrypt(pcs, receivedCmd, len);
+                               memcpy(&ans, receivedCmd, 4);
+                               if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                       cardSTATE_TO_IDLE();
+                                       break;
+                               }
+                               cardINTREG = cardINTREG + ans;
+                               cardSTATE = MFEMUL_WORK;
+                               break;
+                       }
+                       case MFEMUL_INTREG_DEC:{
+                               mf_crypto1_decrypt(pcs, receivedCmd, len);
+                               memcpy(&ans, receivedCmd, 4);
+                               if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                       cardSTATE_TO_IDLE();
+                                       break;
+                               }
+                               cardINTREG = cardINTREG - ans;
+                               cardSTATE = MFEMUL_WORK;
+                               break;
+                       }
+                       case MFEMUL_INTREG_REST:{
+                               mf_crypto1_decrypt(pcs, receivedCmd, len);
+                               memcpy(&ans, receivedCmd, 4);
+                               if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                       cardSTATE_TO_IDLE();
+                                       break;
+                               }
+                               cardSTATE = MFEMUL_WORK;
+                               break;
+                       }

                }
                }

-       

        }
 
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        }
 
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);


@@ -2873,5 +2526,151 @@ Dbprintf("err write block: %d len:%d", cardWRBL, len);
        memset(rAUTH_NT, 0x44, 4);
        LogTrace(rAUTH_NT, 4, 0, 0, TRUE);
 
        memset(rAUTH_NT, 0x44, 4);
        LogTrace(rAUTH_NT, 4, 0, 0, TRUE);
 

-       DbpString("Emulator stopped.");
+       if (MF_DBGLEVEL >= 1)   Dbprintf("Emulator stopped. Tracing: %d  trace length: %d ",    tracing, traceLen);
+}
+
+//-----------------------------------------------------------------------------
+// MIFARE sniffer. 
+// 
+//-----------------------------------------------------------------------------
+void RAMFUNC SniffMifare(uint8_t param) {
+       // param:
+       // bit 0 - trigger from first card answer
+       // bit 1 - trigger from first reader 7-bit request
+
+       // C(red) A(yellow) B(green)
+       LEDsoff();
+       // init trace buffer
+    iso14a_clear_trace();
+
+       // 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 *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+       // The response (tag -> reader) that we're receiving.
+       uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
+
+       // As we receive stuff, we copy it from receivedCmd or receivedResponse
+       // into trace, along with its length and other annotations.
+       //uint8_t *trace = (uint8_t *)BigBuf;
+       
+       // The DMA buffer, used to stream samples from the FPGA
+       int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
+       int8_t *data = dmaBuf;
+       int maxDataLen = 0;
+       int dataLen = 0;
+
+       // Set up the demodulator for tag -> reader responses.
+       Demod.output = receivedResponse;
+       Demod.len = 0;
+       Demod.state = DEMOD_UNSYNCD;
+
+       // Set up the demodulator for the reader -> tag commands
+       memset(&Uart, 0, sizeof(Uart));
+       Uart.output = receivedCmd;
+       Uart.byteCntMax = 32; // was 100 (greg)//////////////////
+       Uart.state = STATE_UNSYNCD;
+
+       // Setup for the DMA.
+       FpgaSetupSsc();
+       FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
+
+       // And put the FPGA in the appropriate mode
+       // Signal field is off with the appropriate LED
+       LED_D_OFF();
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+       
+       // init sniffer
+       MfSniffInit();
+       int sniffCounter = 0;
+
+       // And now we loop, receiving samples.
+       while(true) {
+               if(BUTTON_PRESS()) {
+                       DbpString("cancelled by button");
+                       goto done;
+               }
+
+               LED_A_ON();
+               WDT_HIT();
+               
+               if (++sniffCounter > 65) {
+                       if (MfSniffSend(2000)) {
+                               FpgaEnableSscDma();
+                       }
+                       sniffCounter = 0;
+               }
+
+               int register readBufDataP = data - dmaBuf;
+               int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR;
+               if (readBufDataP <= dmaBufDataP){
+                       dataLen = dmaBufDataP - readBufDataP;
+               } else {
+                       dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP + 1;
+               }
+               // test for length of buffer
+               if(dataLen > maxDataLen) {
+                       maxDataLen = dataLen;
+                       if(dataLen > 400) {
+                               Dbprintf("blew circular buffer! dataLen=0x%x", dataLen);
+                               goto done;
+                       }
+               }
+               if(dataLen < 1) continue;
+
+               // primary buffer was stopped( <-- we lost data!
+               if (!AT91C_BASE_PDC_SSC->PDC_RCR) {
+                       AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf;
+                       AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE;
+                       Dbprintf("RxEmpty ERROR!!! data length:%d", dataLen); // temporary
+               }
+               // secondary buffer sets as primary, secondary buffer was stopped
+               if (!AT91C_BASE_PDC_SSC->PDC_RNCR) {
+                       AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
+                       AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
+               }
+
+               LED_A_OFF();
+               
+               if(MillerDecoding((data[0] & 0xF0) >> 4)) {
+                       LED_C_INV();
+                       // check - if there is a short 7bit request from reader
+                       if (MfSniffLogic(receivedCmd, Uart.byteCnt, Uart.parityBits, Uart.bitCnt, TRUE)) break;
+
+                       /* And ready to receive another command. */
+                       Uart.state = STATE_UNSYNCD;
+                       
+                       /* And also reset the demod code */
+                       Demod.state = DEMOD_UNSYNCD;
+               }
+
+               if(ManchesterDecoding(data[0] & 0x0F)) {
+                       LED_C_INV();
+
+                       if (MfSniffLogic(receivedResponse, Demod.len, Demod.parityBits, Demod.bitCount, FALSE)) break;
+
+                       // And ready to receive another response.
+                       memset(&Demod, 0, sizeof(Demod));
+                       Demod.output = receivedResponse;
+                       Demod.state = DEMOD_UNSYNCD;
+
+                       /* And also reset the uart code */
+                       Uart.state = STATE_UNSYNCD;
+               }
+
+               data++;
+               if(data > dmaBuf + DMA_BUFFER_SIZE) {
+                       data = dmaBuf;
+               }
+       } // main cycle
+
+       DbpString("COMMAND FINISHED");
+
+done:
+       FpgaDisableSscDma();
+       MfSniffEnd();
+       
+       Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x Uart.byteCntMax=%x", maxDataLen, Uart.state, Uart.byteCnt, Uart.byteCntMax);
+       LEDsoff();

 }
 }