]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/iso14443a.c
ADD: added some changes from Marshmellow
[proxmark3-svn] / armsrc / iso14443a.c
index d8edc209803f017c15da7e7cf7ec6ddae9a8a75a..b9fb9baea308d476a961a3c9d1c77c85ce392768 100644 (file)
 // Routines to support ISO 14443 type A.
 //-----------------------------------------------------------------------------
 
 // Routines to support ISO 14443 type A.
 //-----------------------------------------------------------------------------
 
-#include "../include/proxmark3.h"
+#include "proxmark3.h"
 #include "apps.h"
 #include "util.h"
 #include "string.h"
 #include "apps.h"
 #include "util.h"
 #include "string.h"
-#include "../common/cmd.h"
-#include "../common/iso14443crc.h"
+#include "cmd.h"
+#include "iso14443crc.h"
 #include "iso14443a.h"
 #include "crapto1.h"
 #include "mifareutil.h"
 #include "iso14443a.h"
 #include "crapto1.h"
 #include "mifareutil.h"
-
+#include "BigBuf.h"
 static uint32_t iso14a_timeout;
 static uint32_t iso14a_timeout;
-uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET;
 int rsamples = 0;
 int rsamples = 0;
-int traceLen = 0;
-int tracing = TRUE;
 uint8_t trigger = 0;
 // the block number for the ISO14443-4 PCB
 static uint8_t iso14_pcb_blocknum = 0;
 uint8_t trigger = 0;
 // the block number for the ISO14443-4 PCB
 static uint8_t iso14_pcb_blocknum = 0;
@@ -143,23 +140,40 @@ 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
 };
 
+
 void iso14a_set_trigger(bool enable) {
        trigger = enable;
 }
 
 void iso14a_set_trigger(bool 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;
 
 void iso14a_set_timeout(uint32_t timeout) {
        iso14a_timeout = timeout;
+       if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443A Timeout set to %ld (%dms)", iso14a_timeout, iso14a_timeout / 106);
 }
 
 }
 
+
+void iso14a_set_ATS_timeout(uint8_t *ats) {
+
+       uint8_t tb1;
+       uint8_t fwi; 
+       uint32_t fwt;
+       
+       if (ats[0] > 1) {                                                       // there is a format byte T0
+               if ((ats[1] & 0x20) == 0x20) {                  // there is an interface byte TB(1)
+                       if ((ats[1] & 0x10) == 0x10) {          // there is an interface byte TA(1) preceding TB(1)
+                               tb1 = ats[3];
+                       } else {
+                               tb1 = ats[2];
+                       }
+                       fwi = (tb1 & 0xf0) >> 4;                        // frame waiting indicator (FWI)
+                       fwt = 256 * 16 * (1 << fwi);            // frame waiting time (FWT) in 1/fc
+                       
+                       iso14a_set_timeout(fwt/(8*16));
+               }
+       }
+}
+
+
 //-----------------------------------------------------------------------------
 // Generate the parity value for a byte sequence
 //
 //-----------------------------------------------------------------------------
 // Generate the parity value for a byte sequence
 //
@@ -169,7 +183,7 @@ byte_t oddparity (const byte_t bt)
        return OddByteParity[bt];
 }
 
        return OddByteParity[bt];
 }
 
-void GetParity(const uint8_t * pbtCmd, uint16_t iLen, uint8_t *par)
+void GetParity(const uint8_t *pbtCmd, uint16_t iLen, uint8_t *par)
 {
        uint16_t paritybit_cnt = 0;
        uint16_t paritybyte_cnt = 0;
 {
        uint16_t paritybit_cnt = 0;
        uint16_t paritybyte_cnt = 0;
@@ -179,15 +193,15 @@ void GetParity(const uint8_t * pbtCmd, uint16_t iLen, uint8_t *par)
                // Generate the parity bits
                parityBits |= ((OddByteParity[pbtCmd[i]]) << (7-paritybit_cnt));
                if (paritybit_cnt == 7) {
                // Generate the parity bits
                parityBits |= ((OddByteParity[pbtCmd[i]]) << (7-paritybit_cnt));
                if (paritybit_cnt == 7) {
-                       par[paritybyte_cnt] = parityBits; // save 8 Bits parity
-                       parityBits = 0; // and advance to next Parity Byte
+                       par[paritybyte_cnt] = parityBits;       // save 8 Bits parity
+                       parityBits = 0;                                         // and advance to next Parity Byte
                        paritybyte_cnt++;
                        paritybit_cnt = 0;
                } else {
                        paritybyte_cnt++;
                        paritybit_cnt = 0;
                } else {
-               paritybit_cnt++;
+                       paritybit_cnt++;
                }
        }
                }
        }
-               
+
        // save remaining parity bits
        par[paritybyte_cnt] = parityBits;
        
        // save remaining parity bits
        par[paritybyte_cnt] = parityBits;
        
@@ -198,61 +212,12 @@ 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);
 }
 
-// The function LogTrace() is also used by the iClass implementation in iClass.c
-bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
+void AppendCrc14443b(uint8_t* data, int len)
 {
 {
-       if (!tracing) return FALSE;
-       
-       uint16_t num_paritybytes = (iLen-1)/8 + 1; // number of valid paritybytes in *parity
-       uint16_t duration = timestamp_end - timestamp_start;
-
-       // Return when trace is full
-       if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= TRACE_SIZE) {
-               tracing = FALSE;        // don't trace any more
-               return FALSE;
-       }
-       
-       // Traceformat:
-       // 32 bits timestamp (little endian)
-       // 16 bits duration (little endian)
-       // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
-       // y Bytes data
-       // x Bytes parity (one byte per 8 bytes data)
-
-       // timestamp (start)
-       trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
-       trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
-       trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
-       trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
-       
-       // duration
-       trace[traceLen++] = ((duration >> 0) & 0xff);
-       trace[traceLen++] = ((duration >> 8) & 0xff);
-       
-       // data length
-       trace[traceLen++] = ((iLen >> 0) & 0xff);
-       trace[traceLen++] = ((iLen >> 8) & 0xff);
-       
-       // readerToTag flag
-       if (!readerToTag) {
-               trace[traceLen - 1] |= 0x80;
-       }
-
-       // data bytes
-       if (btBytes != NULL && iLen != 0) {
-               memcpy(trace + traceLen, btBytes, iLen);
-       }
-       traceLen += iLen;
-       
-       // parity bytes
-       if (parity != NULL && iLen != 0) {
-               memcpy(trace + traceLen, parity, num_paritybytes);
-       }
-       traceLen += num_paritybytes;
-       
-       return TRUE;
+       ComputeCrc14443(CRC_14443_B,data,len,data+len,data+len+1);
 }
 
 }
 
+
 //=============================================================================
 // ISO 14443 Type A - Miller decoder
 //=============================================================================
 //=============================================================================
 // ISO 14443 Type A - Miller decoder
 //=============================================================================
@@ -272,13 +237,17 @@ bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_
 static tUart Uart;
 
 // Lookup-Table to decide if 4 raw bits are a modulation.
 static tUart Uart;
 
 // Lookup-Table to decide if 4 raw bits are a modulation.
-// We accept two or three consecutive "0" in any position with the rest "1"
+// We accept the following:
+// 0001  -   a 3 tick wide pause
+// 0011  -   a 2 tick wide pause, or a three tick wide pause shifted left
+// 0111  -   a 2 tick wide pause shifted left
+// 1001  -   a 2 tick wide pause shifted right
 const bool Mod_Miller_LUT[] = {
 const bool Mod_Miller_LUT[] = {
-       TRUE,  TRUE,  FALSE, TRUE,  FALSE, FALSE, FALSE, FALSE,
-       TRUE,  TRUE,  FALSE, FALSE, TRUE,  FALSE, FALSE, FALSE
+       FALSE,  TRUE, FALSE, TRUE,  FALSE, FALSE, FALSE, TRUE,
+       FALSE,  TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE
 };
 };
-#define IsMillerModulationNibble1(b) (Mod_Miller_LUT[(b & 0x00F0) >> 4])
-#define IsMillerModulationNibble2(b) (Mod_Miller_LUT[(b & 0x000F)])
+#define IsMillerModulationNibble1(b) (Mod_Miller_LUT[(b & 0x000000F0) >> 4])
+#define IsMillerModulationNibble2(b) (Mod_Miller_LUT[(b & 0x0000000F)])
 
 void UartReset()
 {
 
 void UartReset()
 {
@@ -288,16 +257,19 @@ void UartReset()
        Uart.parityLen = 0;                                     // number of decoded parity bytes
        Uart.shiftReg = 0;                                      // shiftreg to hold decoded data bits
        Uart.parityBits = 0;                            // holds 8 parity bits
        Uart.parityLen = 0;                                     // number of decoded parity bytes
        Uart.shiftReg = 0;                                      // shiftreg to hold decoded data bits
        Uart.parityBits = 0;                            // holds 8 parity bits
-       Uart.twoBits = 0x0000;                          // buffer for 2 Bits
-       Uart.highCnt = 0;
        Uart.startTime = 0;
        Uart.endTime = 0;
        Uart.startTime = 0;
        Uart.endTime = 0;
+       
+       Uart.byteCntMax = 0;
+       Uart.posCnt = 0;
+       Uart.syncBit = 9999;
 }
 
 void UartInit(uint8_t *data, uint8_t *parity)
 {
        Uart.output = data;
        Uart.parity = parity;
 }
 
 void UartInit(uint8_t *data, uint8_t *parity)
 {
        Uart.output = data;
        Uart.parity = parity;
+       Uart.fourBits = 0x00000000;                     // clear the buffer for 4 Bits
        UartReset();
 }
 
        UartReset();
 }
 
@@ -305,45 +277,48 @@ void UartInit(uint8_t *data, uint8_t *parity)
 static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
 {
 
 static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
 {
 
-       Uart.twoBits = (Uart.twoBits << 8) | bit;
+       Uart.fourBits = (Uart.fourBits << 8) | bit;
        
        if (Uart.state == STATE_UNSYNCD) {                                                                                      // not yet synced
        
        
        if (Uart.state == STATE_UNSYNCD) {                                                                                      // not yet synced
        
-               if (Uart.highCnt < 7) {                                                                                                 // wait for a stable unmodulated signal
-                       if (Uart.twoBits == 0xffff) {
-                               Uart.highCnt++;
-                       } else {
-                               Uart.highCnt = 0;
-                       }
-               } else {
-                       Uart.syncBit = 0xFFFF; // not set
-                       // look for 00xx1111 (the start bit)
-                       if              ((Uart.twoBits & 0x6780) == 0x0780) Uart.syncBit = 7; 
-                       else if ((Uart.twoBits & 0x33C0) == 0x03C0) Uart.syncBit = 6;
-                       else if ((Uart.twoBits & 0x19E0) == 0x01E0) Uart.syncBit = 5;
-                       else if ((Uart.twoBits & 0x0CF0) == 0x00F0) Uart.syncBit = 4;
-                       else if ((Uart.twoBits & 0x0678) == 0x0078) Uart.syncBit = 3;
-                       else if ((Uart.twoBits & 0x033C) == 0x003C) Uart.syncBit = 2;
-                       else if ((Uart.twoBits & 0x019E) == 0x001E) Uart.syncBit = 1;
-                       else if ((Uart.twoBits & 0x00CF) == 0x000F) Uart.syncBit = 0;
-                       if (Uart.syncBit != 0xFFFF) {
+               Uart.syncBit = 9999;                                                                                                    // not set
+               
+               // 00x11111 2|3 ticks pause followed by 6|5 ticks unmodulated           Sequence Z (a "0" or "start of communication")
+               // 11111111 8 ticks unmodulation                                                                        Sequence Y (a "0" or "end of communication" or "no information")
+               // 111100x1 4 ticks unmodulated followed by 2|3 ticks pause                     Sequence X (a "1")
+
+               // The start bit is one ore more Sequence Y followed by a Sequence Z (... 11111111 00x11111). We need to distinguish from
+               // Sequence X followed by Sequence Y followed by Sequence Z     (111100x1 11111111 00x11111)
+               // we therefore look for a ...xx1111 11111111 00x11111xxxxxx... pattern 
+               // (12 '1's followed by 2 '0's, eventually followed by another '0', followed by 5 '1's)
+               //
+#define ISO14443A_STARTBIT_MASK                0x07FFEF80              // mask is    00001111 11111111 1110 1111 10000000
+#define ISO14443A_STARTBIT_PATTERN     0x07FF8F80              // pattern is 00001111 11111111 1000 1111 10000000
+
+               if              ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 0)) == ISO14443A_STARTBIT_PATTERN >> 0) Uart.syncBit = 7;
+               else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 1)) == ISO14443A_STARTBIT_PATTERN >> 1) Uart.syncBit = 6;
+               else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 2)) == ISO14443A_STARTBIT_PATTERN >> 2) Uart.syncBit = 5;
+               else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 3)) == ISO14443A_STARTBIT_PATTERN >> 3) Uart.syncBit = 4;
+               else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 4)) == ISO14443A_STARTBIT_PATTERN >> 4) Uart.syncBit = 3;
+               else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 5)) == ISO14443A_STARTBIT_PATTERN >> 5) Uart.syncBit = 2;
+               else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 6)) == ISO14443A_STARTBIT_PATTERN >> 6) Uart.syncBit = 1;
+               else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 7)) == ISO14443A_STARTBIT_PATTERN >> 7) Uart.syncBit = 0;
+
+               if (Uart.syncBit != 9999) {                                                                                             // found a sync bit
                                Uart.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8);
                                Uart.startTime -= Uart.syncBit;
                                Uart.endTime = Uart.startTime;
                                Uart.state = STATE_START_OF_COMMUNICATION;
                        }
                                Uart.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8);
                                Uart.startTime -= Uart.syncBit;
                                Uart.endTime = Uart.startTime;
                                Uart.state = STATE_START_OF_COMMUNICATION;
                        }
-               }
 
        } else {
 
 
        } else {
 
-               if (IsMillerModulationNibble1(Uart.twoBits >> Uart.syncBit)) {                  
-                       if (IsMillerModulationNibble2(Uart.twoBits >> Uart.syncBit)) {          // Modulation in both halves - error
+               if (IsMillerModulationNibble1(Uart.fourBits >> Uart.syncBit)) {                 
+                       if (IsMillerModulationNibble2(Uart.fourBits >> Uart.syncBit)) {         // Modulation in both halves - error
                                UartReset();
                                UartReset();
-                               Uart.highCnt = 6;
                        } else {                                                                                                                        // Modulation in first half = Sequence Z = logic "0"
                                if (Uart.state == STATE_MILLER_X) {                                                             // error - must not follow after X
                                        UartReset();
                        } else {                                                                                                                        // Modulation in first half = Sequence Z = logic "0"
                                if (Uart.state == STATE_MILLER_X) {                                                             // error - must not follow after X
                                        UartReset();
-                                       Uart.highCnt = 6;
                                } else {
                                        Uart.bitCount++;
                                        Uart.shiftReg = (Uart.shiftReg >> 1);                                           // add a 0 to the shiftreg
                                } else {
                                        Uart.bitCount++;
                                        Uart.shiftReg = (Uart.shiftReg >> 1);                                           // add a 0 to the shiftreg
@@ -355,15 +330,15 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
                                                Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01);               // store parity bit
                                                Uart.bitCount = 0;
                                                Uart.shiftReg = 0;
                                                Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01);               // store parity bit
                                                Uart.bitCount = 0;
                                                Uart.shiftReg = 0;
-                                               if((Uart.len & 0x0007) == 0) { // every 8 data bytes
-                                                               Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
-                                                               Uart.parityBits = 0;
+                                               if((Uart.len&0x0007) == 0) {                                                    // every 8 data bytes
+                                                       Uart.parity[Uart.parityLen++] = Uart.parityBits;        // store 8 parity bits
+                                                       Uart.parityBits = 0;
                                                }
                                        }
                                }
                        }
                } else {
                                                }
                                        }
                                }
                        }
                } else {
-                       if (IsMillerModulationNibble2(Uart.twoBits >> Uart.syncBit)) {          // Modulation second half = Sequence X = logic "1"
+                       if (IsMillerModulationNibble2(Uart.fourBits >> Uart.syncBit)) {         // Modulation second half = Sequence X = logic "1"
                                Uart.bitCount++;
                                Uart.shiftReg = (Uart.shiftReg >> 1) | 0x100;                                   // add a 1 to the shiftreg
                                Uart.state = STATE_MILLER_X;
                                Uart.bitCount++;
                                Uart.shiftReg = (Uart.shiftReg >> 1) | 0x100;                                   // add a 1 to the shiftreg
                                Uart.state = STATE_MILLER_X;
@@ -374,32 +349,35 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
                                        Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01);                       // store parity bit
                                        Uart.bitCount = 0;
                                        Uart.shiftReg = 0;
                                        Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01);                       // store parity bit
                                        Uart.bitCount = 0;
                                        Uart.shiftReg = 0;
-                                       if ((Uart.len & 0x0007) == 0) { // every 8 data bytes
-                                               Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
+                                       if ((Uart.len&0x0007) == 0) {                                                           // every 8 data bytes
+                                               Uart.parity[Uart.parityLen++] = Uart.parityBits;                // store 8 parity bits
                                                Uart.parityBits = 0;
                                        }
                                }
                        } else {                                                                                                                        // no modulation in both halves - Sequence Y
                                if (Uart.state == STATE_MILLER_Z || Uart.state == STATE_MILLER_Y) {     // Y after logic "0" - End of Communication
                                        Uart.state = STATE_UNSYNCD;
                                                Uart.parityBits = 0;
                                        }
                                }
                        } else {                                                                                                                        // no modulation in both halves - Sequence Y
                                if (Uart.state == STATE_MILLER_Z || Uart.state == STATE_MILLER_Y) {     // Y after logic "0" - End of Communication
                                        Uart.state = STATE_UNSYNCD;
-                                       Uart.bitCount--;                                        // last "0" was part of EOC sequence
-                                       Uart.shiftReg <<= 1;                            // drop it
-                                       if(Uart.bitCount > 0) {                         // if we decoded some bits
-                                       Uart.shiftReg >>= (9 - Uart.bitCount); // right align them
-                                       Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); // add last byte to the output
-                                       Uart.parityBits <<= 1;                          // add a (void) parity bit
-                                       Uart.parityBits <<= (8 - (Uart.len & 0x0007)); // left align parity bits
-                                       Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store it
-                                       return TRUE;
-                               } else if (Uart.len & 0x0007) {                 // there are some parity bits to store
-                                       Uart.parityBits <<= (8 - (Uart.len & 0x0007)); // left align remaining parity bits
-                                       Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store them
-                                       return TRUE;                                            // we are finished with decoding the raw data sequence
+                                       Uart.bitCount--;                                                                                        // last "0" was part of EOC sequence
+                                       Uart.shiftReg <<= 1;                                                                            // drop it
+                                       if(Uart.bitCount > 0) {                                                                         // if we decoded some bits
+                                               Uart.shiftReg >>= (9 - Uart.bitCount);                                  // right align them
+                                               Uart.output[Uart.len++] = (Uart.shiftReg & 0xff);               // add last byte to the output
+                                               Uart.parityBits <<= 1;                                                                  // add a (void) parity bit
+                                               Uart.parityBits <<= (8 - (Uart.len&0x0007));                    // left align parity bits
+                                               Uart.parity[Uart.parityLen++] = Uart.parityBits;                // and store it
+                                               return TRUE;
+                                       } else if (Uart.len & 0x0007) {                                                         // there are some parity bits to store
+                                               Uart.parityBits <<= (8 - (Uart.len&0x0007));                    // left align remaining parity bits
+                                               Uart.parity[Uart.parityLen++] = Uart.parityBits;                // and store them
+                                       }
+                                       if (Uart.len) {
+                                               return TRUE;                                                                                    // we are finished with decoding the raw data sequence
+                                       } else {
+                                               UartReset();                                                                                    // Nothing received - start over
                                        }
                                }
                                if (Uart.state == STATE_START_OF_COMMUNICATION) {                               // error - must not follow directly after SOC
                                        UartReset();
                                        }
                                }
                                if (Uart.state == STATE_START_OF_COMMUNICATION) {                               // error - must not follow directly after SOC
                                        UartReset();
-                                       Uart.highCnt = 6;
                                } else {                                                                                                                // a logic "0"
                                        Uart.bitCount++;
                                        Uart.shiftReg = (Uart.shiftReg >> 1);                                           // add a 0 to the shiftreg
                                } else {                                                                                                                // a logic "0"
                                        Uart.bitCount++;
                                        Uart.shiftReg = (Uart.shiftReg >> 1);                                           // add a 0 to the shiftreg
@@ -410,8 +388,8 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
                                                Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01);               // store parity bit
                                                Uart.bitCount = 0;
                                                Uart.shiftReg = 0;
                                                Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01);               // store parity bit
                                                Uart.bitCount = 0;
                                                Uart.shiftReg = 0;
-                                               if ((Uart.len & 0x0007) == 0) {                                          // every 8 data bytes
-                                                       Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
+                                               if ((Uart.len&0x0007) == 0) {                                                   // every 8 data bytes
+                                                       Uart.parity[Uart.parityLen++] = Uart.parityBits;        // store 8 parity bits
                                                        Uart.parityBits = 0;
                                                }
                                        }
                                                        Uart.parityBits = 0;
                                                }
                                        }
@@ -419,7 +397,7 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
                        }
                }
                        
                        }
                }
                        
-       }       
+       } 
 
     return FALSE;      // not finished yet, need more data
 }
 
     return FALSE;      // not finished yet, need more data
 }
@@ -466,6 +444,11 @@ void DemodReset()
        Demod.highCnt = 0;
        Demod.startTime = 0;
        Demod.endTime = 0;
        Demod.highCnt = 0;
        Demod.startTime = 0;
        Demod.endTime = 0;
+       
+       //
+       Demod.bitCount = 0;
+       Demod.syncBit = 0xFFFF;
+       Demod.samples = 0;
 }
 
 void DemodInit(uint8_t *data, uint8_t *parity)
 }
 
 void DemodInit(uint8_t *data, uint8_t *parity)
@@ -523,8 +506,8 @@ static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non
                                Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01);     // store parity bit
                                Demod.bitCount = 0;
                                Demod.shiftReg = 0;
                                Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01);     // store parity bit
                                Demod.bitCount = 0;
                                Demod.shiftReg = 0;
-                               if((Demod.len & 0x0007) == 0) { // every 8 data bytes
-                                       Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits
+                               if((Demod.len&0x0007) == 0) {                                                   // every 8 data bytes
+                                       Demod.parity[Demod.parityLen++] = Demod.parityBits;     // store 8 parity bits
                                        Demod.parityBits = 0;
                                }
                        }
                                        Demod.parityBits = 0;
                                }
                        }
@@ -539,32 +522,32 @@ static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non
                                        Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit
                                        Demod.bitCount = 0;
                                        Demod.shiftReg = 0;
                                        Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit
                                        Demod.bitCount = 0;
                                        Demod.shiftReg = 0;
-                                       if ((Demod.len & 0x0007) == 0) { // every 8 data bytes
-                                               Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits1
+                                       if ((Demod.len&0x0007) == 0) {                                          // every 8 data bytes
+                                               Demod.parity[Demod.parityLen++] = Demod.parityBits;     // store 8 parity bits1
                                                Demod.parityBits = 0;
                                        }
                                }
                                Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1);
                        } else {                                                                                                        // no modulation in both halves - End of communication
                                                Demod.parityBits = 0;
                                        }
                                }
                                Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1);
                        } else {                                                                                                        // no modulation in both halves - End of communication
-                                       if(Demod.bitCount > 0) { // there are some remaining data bits
-                                               Demod.shiftReg >>= (9 - Demod.bitCount); // right align the decoded bits
-                                               Demod.output[Demod.len++] = Demod.shiftReg & 0xff; // and add them to the output
-                                               Demod.parityBits <<= 1; // add a (void) parity bit
-                                               Demod.parityBits <<= (8 - (Demod.len & 0x0007)); // left align remaining parity bits
-                                               Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them
-                                               return TRUE;
-                                       } else if (Demod.len & 0x0007) { // there are some parity bits to store
-                                               Demod.parityBits <<= (8 - (Demod.len & 0x0007)); // left align remaining parity bits
-                                               Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them
-                                       return TRUE; // we are finished with decoding the raw data sequence
+                               if(Demod.bitCount > 0) {                                                                // there are some remaining data bits
+                                       Demod.shiftReg >>= (9 - Demod.bitCount);                        // right align the decoded bits
+                                       Demod.output[Demod.len++] = Demod.shiftReg & 0xff;      // and add them to the output
+                                       Demod.parityBits <<= 1;                                                         // add a (void) parity bit
+                                       Demod.parityBits <<= (8 - (Demod.len&0x0007));          // left align remaining parity bits
+                                       Demod.parity[Demod.parityLen++] = Demod.parityBits;     // and store them
+                                       return TRUE;
+                               } else if (Demod.len & 0x0007) {                                                // there are some parity bits to store
+                                       Demod.parityBits <<= (8 - (Demod.len&0x0007));          // left align remaining parity bits
+                                       Demod.parity[Demod.parityLen++] = Demod.parityBits;     // and store them
+                               }
+                               if (Demod.len) {
+                                       return TRUE;                                                                            // we are finished with decoding the raw data sequence
                                } else {                                                                                                // nothing received. Start over
                                        DemodReset();
                                }
                        }
                }
                                } else {                                                                                                // nothing received. Start over
                                        DemodReset();
                                }
                        }
                }
-                       
        } 
        } 
-
     return FALSE;      // not finished yet, need more data
 }
 
     return FALSE;      // not finished yet, need more data
 }
 
@@ -584,9 +567,6 @@ void RAMFUNC SnoopIso14443a(uint8_t param) {
        // bit 1 - trigger from first reader 7-bit request
        
        LEDsoff();
        // bit 1 - trigger from first reader 7-bit request
        
        LEDsoff();
-       // init trace buffer
-       iso14a_clear_trace();
-       iso14a_set_tracing(TRUE);
 
        // 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
 
        // 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
@@ -594,22 +574,25 @@ void RAMFUNC SnoopIso14443a(uint8_t param) {
        // triggered == FALSE -- to wait first for card
        bool triggered = !(param & 0x03); 
        
        // triggered == FALSE -- to wait first for card
        bool triggered = !(param & 0x03); 
        
+       // Allocate memory from BigBuf for some buffers
+       // free all previous allocations first
+       BigBuf_free();
+
        // The command (reader -> tag) that we're receiving.
        // 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;
-       uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET;
+       uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
+       uint8_t *receivedCmdPar = BigBuf_malloc(MAX_PARITY_SIZE);
        
        // The response (tag -> reader) that we're receiving.
        
        // The response (tag -> reader) that we're receiving.
-       uint8_t *receivedResponse = ((uint8_t *)BigBuf) + RECV_RESP_OFFSET;
-       uint8_t *receivedResponsePar = ((uint8_t *)BigBuf) + RECV_RESP_PAR_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;
+       uint8_t *receivedResponse = BigBuf_malloc(MAX_FRAME_SIZE);
+       uint8_t *receivedResponsePar = BigBuf_malloc(MAX_PARITY_SIZE);
        
        // The DMA buffer, used to stream samples from the FPGA
        
        // The DMA buffer, used to stream samples from the FPGA
-       uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET;
+       uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
+
+       // init trace buffer
+       clear_trace();
+       set_tracing(TRUE);
+
        uint8_t *data = dmaBuf;
        uint8_t previous_data = 0;
        int maxDataLen = 0;
        uint8_t *data = dmaBuf;
        uint8_t previous_data = 0;
        int maxDataLen = 0;
@@ -621,10 +604,10 @@ void RAMFUNC SnoopIso14443a(uint8_t param) {
 
        // Set up the demodulator for tag -> reader responses.
        DemodInit(receivedResponse, receivedResponsePar);
 
        // Set up the demodulator for tag -> reader responses.
        DemodInit(receivedResponse, receivedResponsePar);
-
+       
        // Set up the demodulator for the reader -> tag commands
        UartInit(receivedCmd, receivedCmdPar);
        // Set up the demodulator for the reader -> tag commands
        UartInit(receivedCmd, receivedCmdPar);
-
+       
        // Setup and start DMA.
        FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
        
        // Setup and start DMA.
        FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
        
@@ -649,7 +632,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param) {
                // test for length of buffer
                if(dataLen > maxDataLen) {
                        maxDataLen = dataLen;
                // test for length of buffer
                if(dataLen > maxDataLen) {
                        maxDataLen = dataLen;
-                       if(dataLen > 400) {
+                       if(dataLen > (9 * DMA_BUFFER_SIZE / 10)) {
                                Dbprintf("blew circular buffer! dataLen=%d", dataLen);
                                break;
                        }
                                Dbprintf("blew circular buffer! dataLen=%d", dataLen);
                                break;
                        }
@@ -681,12 +664,12 @@ void RAMFUNC SnoopIso14443a(uint8_t param) {
                                        if ((!triggered) && (param & 0x02) && (Uart.len == 1) && (Uart.bitCount == 7)) triggered = TRUE;
 
                                        if(triggered) {
                                        if ((!triggered) && (param & 0x02) && (Uart.len == 1) && (Uart.bitCount == 7)) triggered = TRUE;
 
                                        if(triggered) {
-                                               if (!LogTrace(receivedCmd,
-                                                       Uart.len,
-                                                       Uart.startTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER,
-                                                       Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER,
-                                                       Uart.parity,
-                                                       TRUE)) break;
+                                               if (!LogTrace(receivedCmd, 
+                                                                               Uart.len, 
+                                                                               Uart.startTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER,
+                                                                               Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER,
+                                                                               Uart.parity, 
+                                                                               TRUE)) break;
                                        }
                                        /* And ready to receive another command. */
                                        UartReset();
                                        }
                                        /* And ready to receive another command. */
                                        UartReset();
@@ -703,17 +686,20 @@ void RAMFUNC SnoopIso14443a(uint8_t param) {
                                if(ManchesterDecoding(tagdata, 0, (rsamples-1)*4)) {
                                        LED_B_ON();
 
                                if(ManchesterDecoding(tagdata, 0, (rsamples-1)*4)) {
                                        LED_B_ON();
 
-                                       if (!LogTrace(receivedResponse,
-                                               Demod.len,
-                                               Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
-                                               Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
-                                               Demod.parity,
-                                               FALSE)) break;
+                                       if (!LogTrace(receivedResponse, 
+                                                                       Demod.len, 
+                                                                       Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER, 
+                                                                       Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
+                                                                       Demod.parity,
+                                                                       FALSE)) break;
 
                                        if ((!triggered) && (param & 0x01)) triggered = TRUE;
 
                                        // And ready to receive another response.
                                        DemodReset();
 
                                        if ((!triggered) && (param & 0x01)) triggered = TRUE;
 
                                        // And ready to receive another response.
                                        DemodReset();
+                                       // And reset the Miller decoder including itS (now outdated) input buffer
+                                       UartInit(receivedCmd, receivedCmdPar);
+
                                        LED_C_OFF();
                                } 
                                TagIsActive = (Demod.state != DEMOD_UNSYNCD);
                                        LED_C_OFF();
                                } 
                                TagIsActive = (Demod.state != DEMOD_UNSYNCD);
@@ -732,14 +718,14 @@ void RAMFUNC SnoopIso14443a(uint8_t param) {
 
        FpgaDisableSscDma();
        Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len);
 
        FpgaDisableSscDma();
        Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len);
-       Dbprintf("traceLen=%d, Uart.output[0]=%08x", traceLen, (uint32_t)Uart.output[0]);
+       Dbprintf("traceLen=%d, Uart.output[0]=%08x", BigBuf_get_traceLen(), (uint32_t)Uart.output[0]);
        LEDsoff();
 }
 
 //-----------------------------------------------------------------------------
 // Prepare tag messages
 //-----------------------------------------------------------------------------
        LEDsoff();
 }
 
 //-----------------------------------------------------------------------------
 // Prepare tag messages
 //-----------------------------------------------------------------------------
-static void CodeIso14443aAsTagPar(const uint8_t *cmd,  uint16_t len, uint8_t *parity)
+static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity)
 {
        ToSendReset();
 
 {
        ToSendReset();
 
@@ -757,7 +743,7 @@ static void CodeIso14443aAsTagPar(const uint8_t *cmd,  uint16_t len, uint8_t *pa
        ToSend[++ToSendMax] = SEC_D;
        LastProxToAirDuration = 8 * ToSendMax - 4;
 
        ToSend[++ToSendMax] = SEC_D;
        LastProxToAirDuration = 8 * ToSendMax - 4;
 
-       for( uint16_t i = 0; i < len; i++) {
+       for(uint16_t i = 0; i < len; i++) {
                uint8_t b = cmd[i];
 
                // Data bits
                uint8_t b = cmd[i];
 
                // Data bits
@@ -878,7 +864,7 @@ int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par);
 bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint8_t *reader_Parity,
                                 uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity);
 
 bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint8_t *reader_Parity,
                                 uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity);
 
-static uint8_t* free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
+static uint8_t* free_buffer_pointer;
 
 typedef struct {
   uint8_t* response;
 
 typedef struct {
   uint8_t* response;
@@ -888,10 +874,6 @@ typedef struct {
   uint32_t ProxToAirDuration;
 } tag_response_info_t;
 
   uint32_t ProxToAirDuration;
 } tag_response_info_t;
 
-void reset_free_buffer() {
-  free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
-}
-
 bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffer_size) {
        // Example response, answer to MIFARE Classic read block will be 16 bytes + 2 CRC = 18 bytes
        // This will need the following byte array for a modulation sequence
 bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffer_size) {
        // Example response, answer to MIFARE Classic read block will be 16 bytes + 2 CRC = 18 bytes
        // This will need the following byte array for a modulation sequence
@@ -903,7 +885,8 @@ bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffe
        // ----------- +
        //    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
        //
-  
   // Prepare the tag modulation bits from the message
   CodeIso14443aAsTag(response_info->response,response_info->response_n);
   
   // Prepare the tag modulation bits from the message
   CodeIso14443aAsTag(response_info->response,response_info->response_n);
   
@@ -924,15 +907,22 @@ bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffe
   return true;
 }
 
   return true;
 }
 
+
+// "precompile" responses. There are 7 predefined responses with a total of 28 bytes data to transmit.
+// Coded responses need one byte per bit to transfer (data, parity, start, stop, correction) 
+// 28 * 8 data bits, 28 * 1 parity bits, 7 start bits, 7 stop bits, 7 correction bits
+// -> need 273 bytes buffer
+#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 273
+
 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
 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;
+  size_t max_buffer_size = ALLOCATED_TAG_MODULATION_BUFFER_SIZE;
   
   // Forward the prepare tag modulation function to the inner function
   
   // Forward the prepare tag modulation function to the inner function
-  if (prepare_tag_modulation(response_info,max_buffer_size)) {
+  if (prepare_tag_modulation(response_info, max_buffer_size)) {
     // Update the free buffer offset
     free_buffer_pointer += ToSendMax;
     return true;
     // Update the free buffer offset
     free_buffer_pointer += ToSendMax;
     return true;
@@ -947,10 +937,6 @@ bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) {
 //-----------------------------------------------------------------------------
 void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
 {
 //-----------------------------------------------------------------------------
 void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
 {
-       // Enable and clear the trace
-       iso14a_clear_trace();
-       iso14a_set_tracing(TRUE);
-
        uint8_t sak;
 
        // The first response contains the ATQA (note: bytes are transmitted in reverse order).
        uint8_t sak;
 
        // The first response contains the ATQA (note: bytes are transmitted in reverse order).
@@ -994,10 +980,11 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
        }
        
        // The second response contains the (mandatory) first 24 bits of the UID
        }
        
        // The second response contains the (mandatory) first 24 bits of the UID
-       uint8_t response2[5];
+       uint8_t response2[5] = {0x00};
 
        // Check if the uid uses the (optional) part
 
        // Check if the uid uses the (optional) part
-       uint8_t response2a[5];
+       uint8_t response2a[5] = {0x00};
+       
        if (uid_2nd) {
                response2[0] = 0x88;
                num_to_bytes(uid_1st,3,response2+1);
        if (uid_2nd) {
                response2[0] = 0x88;
                num_to_bytes(uid_1st,3,response2+1);
@@ -1018,18 +1005,18 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
        response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3];
 
        // Prepare the mandatory SAK (for 4 and 7 byte 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];
+       uint8_t response3[3]  = {0x00};
        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
        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];
+       uint8_t response3a[3]  = {0x00};
        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
        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, 0x80, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS:
-       // Format byte = 0x58: FSCI=0x08 (FSC=256), TA(1) and TC(1) present,
+       uint8_t response6[] = { 0x04, 0x58, 0x80, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS: 
+       // Format byte = 0x58: FSCI=0x08 (FSC=256), TA(1) and TC(1) present, 
        // TA(1) = 0x80: different divisors not supported, DR = 1, DS = 1
        // TB(1) = not present. Defaults: FWI = 4 (FWT = 256 * 16 * 2^4 * 1/fc = 4833us), SFGI = 0 (SFG = 256 * 16 * 2^0 * 1/fc = 302us)
        // TC(1) = 0x02: CID supported, NAD not supported
        // TA(1) = 0x80: different divisors not supported, DR = 1, DS = 1
        // TB(1) = not present. Defaults: FWI = 4 (FWT = 256 * 16 * 2^4 * 1/fc = 4833us), SFGI = 0 (SFG = 256 * 16 * 2^0 * 1/fc = 302us)
        // TC(1) = 0x02: CID supported, NAD not supported
@@ -1059,9 +1046,17 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
                .modulation_n = 0
        };
   
                .modulation_n = 0
        };
   
-       // Reset the offset pointer of the free buffer
-       reset_free_buffer();
-  
+       BigBuf_free_keep_EM();
+
+       // allocate buffers:
+       uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
+       uint8_t *receivedCmdPar = BigBuf_malloc(MAX_PARITY_SIZE);
+       free_buffer_pointer = BigBuf_malloc(ALLOCATED_TAG_MODULATION_BUFFER_SIZE);
+
+       // clear trace
+       clear_trace();
+       set_tracing(TRUE);
+
        // 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 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++) {
@@ -1082,10 +1077,6 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
        // We need to listen to the high-frequency, peak-detected path.
        iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
 
        // We need to listen to the high-frequency, peak-detected path.
        iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
 
-       // buffers used on software Uart:
-       uint8_t *receivedCmd = ((uint8_t *)BigBuf) + RECV_CMD_OFFSET;
-       uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET;
-       
        cmdsRecvd = 0;
        tag_response_info_t* p_response;
 
        cmdsRecvd = 0;
        tag_response_info_t* p_response;
 
@@ -1095,7 +1086,7 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
                
                if(!GetIso14443aCommandFromReader(receivedCmd, receivedCmdPar, &len)) {
                        DbpString("Button press");
                
                if(!GetIso14443aCommandFromReader(receivedCmd, receivedCmdPar, &len)) {
                        DbpString("Button press");
-                       break;  
+                       break;
                }
 
                p_response = NULL;
                }
 
                p_response = NULL;
@@ -1246,6 +1237,7 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
 
        Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
        LED_A_OFF();
 
        Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
        LED_A_OFF();
+       BigBuf_free_keep_EM();
 }
 
 
 }
 
 
@@ -1317,14 +1309,14 @@ static void TransmitFor14443a(const uint8_t *cmd, uint16_t len, uint32_t *timing
                }
        }
        
                }
        }
        
-       NextTransferTime = MAX(NextTransferTime, LastTimeProxToAirStart + REQUEST_GUARD_TIME);  
+       NextTransferTime = MAX(NextTransferTime, LastTimeProxToAirStart + REQUEST_GUARD_TIME);
 }
 
 
 //-----------------------------------------------------------------------------
 // Prepare reader command (in bits, support short frames) to send to FPGA
 //-----------------------------------------------------------------------------
 }
 
 
 //-----------------------------------------------------------------------------
 // Prepare reader command (in bits, support short frames) to send to FPGA
 //-----------------------------------------------------------------------------
-void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, uint16_t bits, const uint8_t *parity)
+void CodeIso14443aBitsAsReaderPar(const uint8_t *cmd, uint16_t bits, const uint8_t *parity)
 {
        int i, j;
        int last;
 {
        int i, j;
        int last;
@@ -1365,7 +1357,7 @@ void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, uint16_t bits, const uint
                }
 
                // Only transmit parity bit if we transmitted a complete byte
                }
 
                // Only transmit parity bit if we transmitted a complete byte
-               if (j == 8) {
+               if (j == 8 && parity != NULL) {
                        // Get the parity bit
                        if (parity[i>>3] & (0x80 >> (i&0x0007))) {
                                // Sequence X
                        // Get the parity bit
                        if (parity[i>>3] & (0x80 >> (i&0x0007))) {
                                // Sequence X
@@ -1405,11 +1397,12 @@ void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, uint16_t bits, const uint
 //-----------------------------------------------------------------------------
 // Prepare reader command to send to FPGA
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 // Prepare reader command to send to FPGA
 //-----------------------------------------------------------------------------
-void CodeIso14443aAsReaderPar(const uint8_t * cmd, uint16_t len, const uint8_t *parity)
+void CodeIso14443aAsReaderPar(const uint8_t *cmd, uint16_t len, const uint8_t *parity)
 {
   CodeIso14443aBitsAsReaderPar(cmd, len*8, parity);
 }
 
 {
   CodeIso14443aBitsAsReaderPar(cmd, len*8, parity);
 }
 
+
 //-----------------------------------------------------------------------------
 // Wait for commands from reader
 // Stop when button is pressed (return 1) or field was gone (return 2)
 //-----------------------------------------------------------------------------
 // Wait for commands from reader
 // Stop when button is pressed (return 1) or field was gone (return 2)
@@ -1432,9 +1425,9 @@ static int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity)
        // Set ADC to read field strength
        AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST;
        AT91C_BASE_ADC->ADC_MR =
        // Set ADC to read field strength
        AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST;
        AT91C_BASE_ADC->ADC_MR =
-                               ADC_MODE_PRESCALE(32) |
-                               ADC_MODE_STARTUP_TIME(16) |
-                               ADC_MODE_SAMPLE_HOLD_TIME(8);
+                               ADC_MODE_PRESCALE(63) |
+                               ADC_MODE_STARTUP_TIME(1) |
+                               ADC_MODE_SAMPLE_HOLD_TIME(15);
        AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF);
        // start ADC
        AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
        AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF);
        // start ADC
        AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
@@ -1444,7 +1437,7 @@ static int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity)
 
        // Clear RXRDY:
     uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 
        // Clear RXRDY:
     uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-
+       
        for(;;) {
                WDT_HIT();
 
        for(;;) {
                WDT_HIT();
 
@@ -1456,7 +1449,7 @@ static int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity)
                        analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF];
                        AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
                        if (analogCnt >= 32) {
                        analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF];
                        AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
                        if (analogCnt >= 32) {
-                               if ((33000 * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
+                               if ((MAX_ADC_HF_VOLTAGE * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
                                        vtime = GetTickCount();
                                        if (!timer) timer = vtime;
                                        // 50ms no field --> card to idle state
                                        vtime = GetTickCount();
                                        if (!timer) timer = vtime;
                                        // 50ms no field --> card to idle state
@@ -1519,7 +1512,7 @@ static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNe
        AT91C_BASE_SSC->SSC_THR = SEC_F;
 
        // send cycle
        AT91C_BASE_SSC->SSC_THR = SEC_F;
 
        // send cycle
-       for(; i <= respLen; ) {
+       for(; i < respLen; ) {
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
                        AT91C_BASE_SSC->SSC_THR = resp[i++];
                        FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
                        AT91C_BASE_SSC->SSC_THR = resp[i++];
                        FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
@@ -1531,14 +1524,15 @@ static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNe
        }
 
        // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
        }
 
        // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
-       for (i = 0; i < 2 ; ) {
+       uint8_t fpga_queued_bits = FpgaSendQueueDelay >> 3;
+       for (i = 0; i <= fpga_queued_bits/8 + 1; ) {
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
                        AT91C_BASE_SSC->SSC_THR = SEC_F;
                        FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        i++;
                }
        }
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
                        AT91C_BASE_SSC->SSC_THR = SEC_F;
                        FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        i++;
                }
        }
-       
+
        LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0);
 
        return 0;
        LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0);
 
        return 0;
@@ -1589,7 +1583,7 @@ int EmSendCmdEx(uint8_t *resp, uint16_t respLen, bool correctionNeeded){
        GetParity(resp, respLen, par);
        return EmSendCmdExPar(resp, respLen, correctionNeeded, par);
 }
        GetParity(resp, respLen, par);
        return EmSendCmdExPar(resp, respLen, correctionNeeded, par);
 }
-       
+
 int EmSendCmd(uint8_t *resp, uint16_t respLen){
        uint8_t par[MAX_PARITY_SIZE];
        GetParity(resp, respLen, par);
 int EmSendCmd(uint8_t *resp, uint16_t respLen){
        uint8_t par[MAX_PARITY_SIZE];
        GetParity(resp, respLen, par);
@@ -1604,16 +1598,16 @@ bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_Start
                                 uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity)
 {
        if (tracing) {
                                 uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity)
 {
        if (tracing) {
-       // we cannot exactly measure the end and start of a received command from reader. However we know that the delay from
-       // end of the received command to start of the tag's (simulated by us) answer is n*128+20 or n*128+84 resp.
-       // with n >= 9. The start of the tags answer can be measured and therefore the end of the received command be calculated:
-       uint16_t reader_modlen = reader_EndTime - reader_StartTime;
-       uint16_t approx_fdt = tag_StartTime - reader_EndTime;
-       uint16_t exact_fdt = (approx_fdt - 20 + 32)/64 * 64 + 20;
-       reader_EndTime = tag_StartTime - exact_fdt;
-       reader_StartTime = reader_EndTime - reader_modlen;
-       if (!LogTrace(reader_data, reader_len, reader_StartTime, reader_EndTime, reader_Parity, TRUE)) {
-               return FALSE;
+               // we cannot exactly measure the end and start of a received command from reader. However we know that the delay from
+               // end of the received command to start of the tag's (simulated by us) answer is n*128+20 or n*128+84 resp.
+               // with n >= 9. The start of the tags answer can be measured and therefore the end of the received command be calculated:
+               uint16_t reader_modlen = reader_EndTime - reader_StartTime;
+               uint16_t approx_fdt = tag_StartTime - reader_EndTime;
+               uint16_t exact_fdt = (approx_fdt - 20 + 32)/64 * 64 + 20;
+               reader_EndTime = tag_StartTime - exact_fdt;
+               reader_StartTime = reader_EndTime - reader_modlen;
+               if (!LogTrace(reader_data, reader_len, reader_StartTime, reader_EndTime, reader_Parity, TRUE)) {
+                       return FALSE;
                } else return(!LogTrace(tag_data, tag_len, tag_StartTime, tag_EndTime, tag_Parity, FALSE));
        } else {
                return TRUE;
                } else return(!LogTrace(tag_data, tag_len, tag_StartTime, tag_EndTime, tag_Parity, FALSE));
        } else {
                return TRUE;
@@ -1627,7 +1621,7 @@ bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_Start
 //-----------------------------------------------------------------------------
 static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receivedResponsePar, uint16_t offset)
 {
 //-----------------------------------------------------------------------------
 static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receivedResponsePar, uint16_t offset)
 {
-       uint16_t c;
+       uint32_t c = 0x00;
        
        // Set FPGA mode to "reader listen mode", no modulation (listen
        // only, since we are receiving, not transmitting).
        
        // Set FPGA mode to "reader listen mode", no modulation (listen
        // only, since we are receiving, not transmitting).
@@ -1637,11 +1631,10 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receive
        
        // Now get the answer from the card
        DemodInit(receivedResponse, receivedResponsePar);
        
        // Now get the answer from the card
        DemodInit(receivedResponse, receivedResponsePar);
-       
+
        // clear RXRDY:
     uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
        // clear RXRDY:
     uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-       
-       c = 0;
+
        for(;;) {
                WDT_HIT();
 
        for(;;) {
                WDT_HIT();
 
@@ -1650,13 +1643,14 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receive
                        if(ManchesterDecoding(b, offset, 0)) {
                                NextTransferTime = MAX(NextTransferTime, Demod.endTime - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/16 + FRAME_DELAY_TIME_PICC_TO_PCD);
                                return TRUE;
                        if(ManchesterDecoding(b, offset, 0)) {
                                NextTransferTime = MAX(NextTransferTime, Demod.endTime - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/16 + FRAME_DELAY_TIME_PICC_TO_PCD);
                                return TRUE;
-                       } else if (c++ > iso14a_timeout) {
+                       } else if (c++ > iso14a_timeout && Demod.state == DEMOD_UNSYNCD) {
                                return FALSE; 
                        }
                }
        }
 }
 
                                return FALSE; 
                        }
                }
        }
 }
 
+
 void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t *timing)
 {
        CodeIso14443aBitsAsReaderPar(frame, bits, par);
 void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t *timing)
 {
        CodeIso14443aBitsAsReaderPar(frame, bits, par);
@@ -1672,30 +1666,33 @@ void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t
        }
 }
 
        }
 }
 
+
 void ReaderTransmitPar(uint8_t* frame, uint16_t len, uint8_t *par, uint32_t *timing)
 {
   ReaderTransmitBitsPar(frame, len*8, par, timing);
 }
 
 void ReaderTransmitPar(uint8_t* frame, uint16_t len, uint8_t *par, uint32_t *timing)
 {
   ReaderTransmitBitsPar(frame, len*8, par, timing);
 }
 
+
 void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing)
 {
 void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing)
 {
-       // Generate parity and redirect
-       uint8_t par[MAX_PARITY_SIZE];
-       GetParity(frame, len/8, par);
-       ReaderTransmitBitsPar(frame, len, par, timing);
+  // Generate parity and redirect
+  uint8_t par[MAX_PARITY_SIZE];
+  GetParity(frame, len/8, par);
+  ReaderTransmitBitsPar(frame, len, par, timing);
 }
 
 }
 
+
 void ReaderTransmit(uint8_t* frame, uint16_t len, uint32_t *timing)
 {
 void ReaderTransmit(uint8_t* frame, uint16_t len, uint32_t *timing)
 {
-       // Generate parity and redirect
-       uint8_t par[MAX_PARITY_SIZE];
-       GetParity(frame, len, par);
-       ReaderTransmitBitsPar(frame, len*8, par, timing);
+  // Generate parity and redirect
+  uint8_t par[MAX_PARITY_SIZE];
+  GetParity(frame, len, par);
+  ReaderTransmitBitsPar(frame, len*8, par, timing);
 }
 
 int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity)
 {
 }
 
 int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity)
 {
-       if (!GetIso14443aAnswerFromTag(receivedAnswer,parity,offset)) return FALSE;
+       if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, offset)) return FALSE;
        if (tracing) {
                LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE);
        }
        if (tracing) {
                LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE);
        }
@@ -1714,32 +1711,26 @@ int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity)
 /* performs iso14443a anticollision procedure
  * fills the uid pointer unless NULL
  * fills resp_data unless NULL */
 /* performs iso14443a anticollision procedure
  * fills the uid pointer unless NULL
  * fills resp_data unless NULL */
-int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, uint32_t* cuid_ptr) {
-       //uint8_t halt[]       = { 0x50, 0x00, 0x57, 0xCD };  // HALT
-       uint8_t wupa[]       = { 0x52 };  // WAKE-UP
-       //uint8_t reqa[]       = { 0x26 };  // REQUEST A
+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 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) + RECV_RESP_OFFSET;
-       uint8_t *resp_par = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET;
-
+       uint8_t resp[MAX_FRAME_SIZE]; // theoretically. A usual RATS will be much smaller
+       uint8_t resp_par[MAX_PARITY_SIZE];
        byte_t uid_resp[4];
        size_t uid_resp_len;
        byte_t uid_resp[4];
        size_t uid_resp_len;
+
        uint8_t sak = 0x04; // cascade uid
        int cascade_level = 0;
        int len;
        uint8_t sak = 0x04; // cascade uid
        int cascade_level = 0;
        int len;
-       
-       // test for the SKYLANDERS TOY.
-       //ReaderTransmit(halt,sizeof(halt), NULL);
-       //len = ReaderReceive(resp, resp_par);
-       
+
        // Broadcast for a card, WUPA (0x52) will force response from all cards in the field
        // Broadcast for a card, WUPA (0x52) will force response from all cards in the field
-       ReaderTransmitBitsPar(wupa,7,0, NULL);
+    ReaderTransmitBitsPar(wupa,7,0, NULL);
        
        // Receive the ATQA
        if(!ReaderReceive(resp, resp_par)) return 0;
        
        // Receive the ATQA
        if(!ReaderReceive(resp, resp_par)) return 0;
-       
+
        if(p_hi14a_card) {
                memcpy(p_hi14a_card->atqa, resp, 2);
                p_hi14a_card->uidlen = 0;
        if(p_hi14a_card) {
                memcpy(p_hi14a_card->atqa, resp, 2);
                p_hi14a_card->uidlen = 0;
@@ -1751,103 +1742,107 @@ int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, u
                memset(uid_ptr,0,10);
        }
 
                memset(uid_ptr,0,10);
        }
 
-  // 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, resp_par)) return 0;
-
-       if (Demod.collisionPos) {                       // we had a collision and need to construct the UID bit by bit
-               memset(uid_resp, 0, 4);
-               uint16_t uid_resp_bits = 0;
-               uint16_t collision_answer_offset = 0;
-               // anti-collision-loop:
-               while (Demod.collisionPos) {
-                       Dbprintf("Multiple tags detected. Collision after Bit %d", Demod.collisionPos);
-                       for (uint16_t i = collision_answer_offset; i < Demod.collisionPos; i++, uid_resp_bits++) {      // add valid UID bits before collision point
-                               uint16_t UIDbit = (resp[i/8] >> (i % 8)) & 0x01;
-                               uid_resp[uid_resp_bits & 0xf8] |= UIDbit << (uid_resp_bits % 8);
+       // check for proprietary anticollision:
+       if ((resp[0] & 0x1F) == 0) {
+               return 3;
+       }
+       
+       // 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, resp_par)) return 0;
+
+               if (Demod.collisionPos) {                       // we had a collision and need to construct the UID bit by bit
+                       memset(uid_resp, 0, 4);
+                       uint16_t uid_resp_bits = 0;
+                       uint16_t collision_answer_offset = 0;
+                       // anti-collision-loop:
+                       while (Demod.collisionPos) {
+                               Dbprintf("Multiple tags detected. Collision after Bit %d", Demod.collisionPos);
+                               for (uint16_t i = collision_answer_offset; i < Demod.collisionPos; i++, uid_resp_bits++) {      // add valid UID bits before collision point
+                                       uint16_t UIDbit = (resp[i/8] >> (i % 8)) & 0x01;
+                                       uid_resp[uid_resp_bits / 8] |= UIDbit << (uid_resp_bits % 8);
+                               }
+                               uid_resp[uid_resp_bits/8] |= 1 << (uid_resp_bits % 8);                                  // next time select the card(s) with a 1 in the collision position
+                               uid_resp_bits++;
+                               // construct anticollosion command:
+                               sel_uid[1] = ((2 + uid_resp_bits/8) << 4) | (uid_resp_bits & 0x07);     // length of data in bytes and bits
+                               for (uint16_t i = 0; i <= uid_resp_bits/8; i++) {
+                                       sel_uid[2+i] = uid_resp[i];
+                               }
+                               collision_answer_offset = uid_resp_bits%8;
+                               ReaderTransmitBits(sel_uid, 16 + uid_resp_bits, NULL);
+                               if (!ReaderReceiveOffset(resp, collision_answer_offset, resp_par)) return 0;
                        }
                        }
-                       uid_resp[uid_resp_bits/8] |= 1 << (uid_resp_bits % 8);                                  // next time select the card(s) with a 1 in the collision position
-                       uid_resp_bits++;
-                       // construct anticollosion command:
-                       sel_uid[1] = ((2 + uid_resp_bits/8) << 4) | (uid_resp_bits & 0x07);     // length of data in bytes and bits
-                       for (uint16_t i = 0; i <= uid_resp_bits/8; i++) {
-                               sel_uid[2+i] = uid_resp[i];
+                       // finally, add the last bits and BCC of the UID
+                       for (uint16_t i = collision_answer_offset; i < (Demod.len-1)*8; i++, uid_resp_bits++) {
+                               uint16_t UIDbit = (resp[i/8] >> (i%8)) & 0x01;
+                               uid_resp[uid_resp_bits/8] |= UIDbit << (uid_resp_bits % 8);
                        }
                        }
-                       collision_answer_offset = uid_resp_bits%8;
-                       ReaderTransmitBits(sel_uid, 16 + uid_resp_bits, NULL);
-                       if (!ReaderReceiveOffset(resp, collision_answer_offset,resp_par)) return 0;
-               }
-               // finally, add the last bits and BCC of the UID
-               for (uint16_t i = collision_answer_offset; i < (Demod.len-1)*8; i++, uid_resp_bits++) {
-                       uint16_t UIDbit = (resp[i/8] >> (i%8)) & 0x01;
-                       uid_resp[uid_resp_bits/8] |= UIDbit << (uid_resp_bits % 8);
+
+               } else {                // no collision, use the response to SELECT_ALL as current uid
+                       memcpy(uid_resp, resp, 4);
                }
                }
+               uid_resp_len = 4;
 
 
-       } else {                // no collision, use the response to SELECT_ALL as current uid
-               memcpy(uid_resp,resp,4);
-       }
-       uid_resp_len = 4;
+               // calculate crypto UID. Always use last 4 Bytes.
+               if(cuid_ptr) {
+                       *cuid_ptr = bytes_to_num(uid_resp, 4);
+               }
 
 
-    // calculate crypto UID. Always use last 4 Bytes.
-    if(cuid_ptr) {
-        *cuid_ptr = bytes_to_num(uid_resp, 4);
-    }
+               // Construct SELECT UID command
+               sel_uid[1] = 0x70;                                                                                                      // transmitting a full UID (1 Byte cmd, 1 Byte NVB, 4 Byte UID, 1 Byte BCC, 2 Bytes CRC)
+               memcpy(sel_uid+2, uid_resp, 4);                                                                         // the UID
+               sel_uid[6] = sel_uid[2] ^ sel_uid[3] ^ sel_uid[4] ^ sel_uid[5];         // calculate and add BCC
+               AppendCrc14443a(sel_uid, 7);                                                                            // calculate and add CRC
+               ReaderTransmit(sel_uid, sizeof(sel_uid), NULL);
 
 
-    // Construct SELECT UID command
-       sel_uid[1] = 0x70;                                                                                                      // transmitting a full UID (1 Byte cmd, 1 Byte NVB, 4 Byte UID, 1 Byte BCC, 2 Bytes CRC)
-    memcpy(sel_uid+2,uid_resp,4);                                                                              // the UID
-       sel_uid[6] = sel_uid[2] ^ sel_uid[3] ^ sel_uid[4] ^ sel_uid[5];         // calculate and add BCC
-    AppendCrc14443a(sel_uid,7);                                                                                        // calculate and add CRC
-    ReaderTransmit(sel_uid,sizeof(sel_uid), NULL);
+               // Receive the SAK
+               if (!ReaderReceive(resp, resp_par)) return 0;
+               sak = resp[0];
 
 
-    // Receive the SAK
-    if (!ReaderReceive(resp, resp_par)) return 0;
-    sak = resp[0];
-       
     // Test if more parts of the uid are coming
     // Test if more parts of the uid are coming
-    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
-               uid_resp[0] = uid_resp[1];
-               uid_resp[1] = uid_resp[2];
-               uid_resp[2] = uid_resp[3]; 
-                
-               uid_resp_len = 3;
-    }
-
-    if(uid_ptr) {
-      memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len);
-    }
+               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
+                       uid_resp[0] = uid_resp[1];
+                       uid_resp[1] = uid_resp[2];
+                       uid_resp[2] = uid_resp[3]; 
+
+                       uid_resp_len = 3;
+               }
 
 
-    if(p_hi14a_card) {
-      memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len);
-      p_hi14a_card->uidlen += uid_resp_len;
-    }
-  }
+               if(uid_ptr) {
+                       memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len);
+               }
 
 
-  if(p_hi14a_card) {
-    p_hi14a_card->sak = sak;
-    p_hi14a_card->ats_len = 0;
-  }
+               if(p_hi14a_card) {
+                       memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len);
+                       p_hi14a_card->uidlen += uid_resp_len;
+               }
+       }
 
 
-       if( (sak & 0x20) == 0) {
-               return 2; // non iso14443a compliant tag
+       if(p_hi14a_card) {
+               p_hi14a_card->sak = sak;
+               p_hi14a_card->ats_len = 0;
        }
 
        }
 
+       // non iso14443a compliant tag
+       if( (sak & 0x20) == 0) return 2; 
+
        // Request for answer to select
        AppendCrc14443a(rats, 2);
        ReaderTransmit(rats, sizeof(rats), NULL);
 
        // Request for answer to select
        AppendCrc14443a(rats, 2);
        ReaderTransmit(rats, sizeof(rats), NULL);
 
-       len = ReaderReceive(resp, resp_par);
-       if(!len) return 0;
+       if (!(len = ReaderReceive(resp, resp_par))) return 0;
 
 
+       
        if(p_hi14a_card) {
                memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats));
                p_hi14a_card->ats_len = len;
        if(p_hi14a_card) {
                memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats));
                p_hi14a_card->ats_len = len;
@@ -1855,7 +1850,11 @@ int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, u
 
        // reset the PCB block number
        iso14_pcb_blocknum = 0;
 
        // reset the PCB block number
        iso14_pcb_blocknum = 0;
-       return 1;
+
+       // set default timeout based on ATS
+       iso14a_set_ATS_timeout(resp);
+
+       return 1;       
 }
 
 void iso14443a_setup(uint8_t fpga_minor_mode) {
 }
 
 void iso14443a_setup(uint8_t fpga_minor_mode) {
@@ -1866,7 +1865,8 @@ void iso14443a_setup(uint8_t fpga_minor_mode) {
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
        // Signal field is on with the appropriate LED
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
        // Signal field is on with the appropriate LED
-       if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD     || fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN) {
+       if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD
+               || fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN) {
                LED_D_ON();
        } else {
                LED_D_OFF();
                LED_D_ON();
        } else {
                LED_D_OFF();
@@ -1879,7 +1879,7 @@ void iso14443a_setup(uint8_t fpga_minor_mode) {
        DemodReset();
        UartReset();
        NextTransferTime = 2*DELAY_ARM2AIR_AS_READER;
        DemodReset();
        UartReset();
        NextTransferTime = 2*DELAY_ARM2AIR_AS_READER;
-       iso14a_set_timeout(1050); // 10ms default  10*105 = 
+       iso14a_set_timeout(10*106); // 10ms default
 }
 
 int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
 }
 
 int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
@@ -1894,7 +1894,7 @@ int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
  
        ReaderTransmit(real_cmd, cmd_len+4, NULL);
        size_t len = ReaderReceive(data, parity);
  
        ReaderTransmit(real_cmd, cmd_len+4, NULL);
        size_t len = ReaderReceive(data, parity);
-       uint8_t * data_bytes = (uint8_t *) data;
+       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
        if (!len)
                return 0; //DATA LINK ERROR
        // if we received an I- or R(ACK)-Block with a block number equal to the
@@ -1918,17 +1918,18 @@ void ReaderIso14443a(UsbCommand *c)
 {
        iso14a_command_t param = c->arg[0];
        uint8_t *cmd = c->d.asBytes;
 {
        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];
+       size_t len = c->arg[1] & 0xffff;
+       size_t lenbits = c->arg[1] >> 16;
+       uint32_t timeout = c->arg[2];
        uint32_t arg0 = 0;
        byte_t buf[USB_CMD_DATA_SIZE];
        uint8_t par[MAX_PARITY_SIZE];
   
        if(param & ISO14A_CONNECT) {
        uint32_t arg0 = 0;
        byte_t buf[USB_CMD_DATA_SIZE];
        uint8_t par[MAX_PARITY_SIZE];
   
        if(param & ISO14A_CONNECT) {
-               iso14a_clear_trace();
+               clear_trace();
        }
 
        }
 
-       iso14a_set_tracing(TRUE);
+       set_tracing(TRUE);
 
        if(param & ISO14A_REQUEST_TRIGGER) {
                iso14a_set_trigger(TRUE);
 
        if(param & ISO14A_REQUEST_TRIGGER) {
                iso14a_set_trigger(TRUE);
@@ -1944,7 +1945,7 @@ void ReaderIso14443a(UsbCommand *c)
        }
 
        if(param & ISO14A_SET_TIMEOUT) {
        }
 
        if(param & ISO14A_SET_TIMEOUT) {
-               iso14a_set_timeout(c->arg[2]);
+               iso14a_set_timeout(timeout);
        }
 
        if(param & ISO14A_APDU) {
        }
 
        if(param & ISO14A_APDU) {
@@ -1954,15 +1955,38 @@ void ReaderIso14443a(UsbCommand *c)
 
        if(param & ISO14A_RAW) {
                if(param & ISO14A_APPEND_CRC) {
 
        if(param & ISO14A_RAW) {
                if(param & ISO14A_APPEND_CRC) {
+                       if(param & ISO14A_TOPAZMODE) {
+                               AppendCrc14443b(cmd,len);
+                       } else {
                        AppendCrc14443a(cmd,len);
                        AppendCrc14443a(cmd,len);
+                       }
                        len += 2;
                        if (lenbits) lenbits += 16;
                }
                        len += 2;
                        if (lenbits) lenbits += 16;
                }
-               if(lenbits>0) {         
-                       GetParity(cmd, lenbits/8, par);         
-                       ReaderTransmitBitsPar(cmd, lenbits, par, NULL);
+               if(lenbits>0) {                         // want to send a specific number of bits (e.g. short commands)
+                       if(param & ISO14A_TOPAZMODE) {
+                               int bits_to_send = lenbits;
+                               uint16_t i = 0;
+                               ReaderTransmitBitsPar(&cmd[i++], MIN(bits_to_send, 7), NULL, NULL);             // first byte is always short (7bits) and no parity
+                               bits_to_send -= 7;
+                               while (bits_to_send > 0) {
+                                       ReaderTransmitBitsPar(&cmd[i++], MIN(bits_to_send, 8), NULL, NULL);     // following bytes are 8 bit and no parity
+                                       bits_to_send -= 8;
+                               }
+                       } else {
+                       GetParity(cmd, lenbits/8, par);
+                               ReaderTransmitBitsPar(cmd, lenbits, par, NULL);                                                 // bytes are 8 bit with odd parity
+                       }
+               } else {                                        // want to send complete bytes only
+                       if(param & ISO14A_TOPAZMODE) {
+                               uint16_t i = 0;
+                               ReaderTransmitBitsPar(&cmd[i++], 7, NULL, NULL);                                                // first byte: 7 bits, no paritiy
+                               while (i < len) {
+                                       ReaderTransmitBitsPar(&cmd[i++], 8, NULL, NULL);                                        // following bytes: 8 bits, no paritiy
+                               }
                } else {
                } else {
-                       ReaderTransmit(cmd,len, NULL);
+                               ReaderTransmit(cmd,len, NULL);                                                                                  // 8 bits, odd parity
+                       }
                }
                arg0 = ReaderReceive(buf, par);
                cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));
                }
                arg0 = ReaderReceive(buf, par);
                cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));
@@ -2018,11 +2042,14 @@ void ReaderMifare(bool first_try)
        uint8_t mf_nr_ar[]   = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
        static uint8_t mf_nr_ar3;
 
        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) + RECV_RESP_OFFSET);
-       uint8_t* receivedAnswerPar = (((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET);
+       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];
+       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];
 
 
-       iso14a_clear_trace();
-       iso14a_set_tracing(TRUE);
+       // free eventually allocated BigBuf memory. We want all for tracing.
+       BigBuf_free();
+       
+       clear_trace();
+       set_tracing(TRUE);
 
        byte_t nt_diff = 0;
        uint8_t par[1] = {0};   // maximum 8 Bytes to be sent here, 1 byte parity is therefore enough
 
        byte_t nt_diff = 0;
        uint8_t par[1] = {0};   // maximum 8 Bytes to be sent here, 1 byte parity is therefore enough
@@ -2157,7 +2184,7 @@ void ReaderMifare(bool first_try)
                        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] =  SwapBits(par[0], 8);
+                       par_list[nt_diff] = SwapBits(par[0], 8);
                        ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
 
                        // Test if the information is complete
                        ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
 
                        // Test if the information is complete
@@ -2195,7 +2222,7 @@ void ReaderMifare(bool first_try)
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        LEDsoff();
 
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        LEDsoff();
 
-       iso14a_set_tracing(FALSE);
+       set_tracing(FALSE);
 }
 
 /**
 }
 
 /**
@@ -2230,10 +2257,10 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
        struct Crypto1State *pcs;
        pcs = &mpcs;
        uint32_t numReads = 0;//Counts numer of times reader read a block
        struct Crypto1State *pcs;
        pcs = &mpcs;
        uint32_t numReads = 0;//Counts numer of times reader read a block
-       uint8_t* receivedCmd = get_bigbufptr_recvcmdbuf();
-       uint8_t* receivedCmd_par = receivedCmd + MAX_FRAME_SIZE;
-       uint8_t* response = get_bigbufptr_recvrespbuf();
-       uint8_t* response_par = response + MAX_FRAME_SIZE;
+       uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE];
+       uint8_t receivedCmd_par[MAX_MIFARE_PARITY_SIZE];
+       uint8_t response[MAX_MIFARE_FRAME_SIZE];
+       uint8_t response_par[MAX_MIFARE_PARITY_SIZE];
        
        uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID
        uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
        
        uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID
        uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
@@ -2250,9 +2277,12 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
        uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0};
        uint8_t ar_nr_collected = 0;
 
        uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0};
        uint8_t ar_nr_collected = 0;
 
+       // free eventually allocated BigBuf memory but keep Emulator Memory
+       BigBuf_free_keep_EM();
+
        // clear trace
        // clear trace
-    iso14a_clear_trace();
-       iso14a_set_tracing(TRUE);
+       clear_trace();
+       set_tracing(TRUE);
 
        // Authenticate response - nonce
        uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
 
        // Authenticate response - nonce
        uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
@@ -2314,10 +2344,8 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                WDT_HIT();
 
                // find reader field
                WDT_HIT();
 
                // 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) {
                if (cardSTATE == MFEMUL_NOFIELD) {
-                       vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10;
+                       vHf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;
                        if (vHf > MF_MINFIELDV) {
                                cardSTATE_TO_IDLE();
                                LED_A_ON();
                        if (vHf > MF_MINFIELDV) {
                                cardSTATE_TO_IDLE();
                                LED_A_ON();
@@ -2392,11 +2420,12 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                                        LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
                                        break;
                                }
                                        LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
                                        break;
                                }
+
                                uint32_t ar = bytes_to_num(receivedCmd, 4);
                                uint32_t nr = bytes_to_num(&receivedCmd[4], 4);
 
                                //Collect AR/NR
                                uint32_t ar = bytes_to_num(receivedCmd, 4);
                                uint32_t nr = bytes_to_num(&receivedCmd[4], 4);
 
                                //Collect AR/NR
-                               if(ar_nr_collected < 2){
+                               if(ar_nr_collected < 2 && cardAUTHSC == 2){
                                        if(ar_nr_responses[2] != ar)
                                        {// Avoid duplicates... probably not necessary, ar should vary. 
                                                ar_nr_responses[ar_nr_collected*4] = cuid;
                                        if(ar_nr_responses[2] != ar)
                                        {// Avoid duplicates... probably not necessary, ar should vary. 
                                                ar_nr_responses[ar_nr_collected*4] = cuid;
@@ -2404,6 +2433,11 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                                                ar_nr_responses[ar_nr_collected*4+2] = ar;
                                                ar_nr_responses[ar_nr_collected*4+3] = nr;
                                                ar_nr_collected++;
                                                ar_nr_responses[ar_nr_collected*4+2] = ar;
                                                ar_nr_responses[ar_nr_collected*4+3] = nr;
                                                ar_nr_collected++;
+                                       }                                               
+                                       // Interactive mode flag, means we need to send ACK
+                                       if(flags & FLAG_INTERACTIVE && ar_nr_collected == 2)
+                                       {
+                                               finished = true;
                                        }
                                }
 
                                        }
                                }
 
@@ -2498,6 +2532,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                                                ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); 
                                                num_to_bytes(ans, 4, rAUTH_AT);
                                        }
                                                ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); 
                                                num_to_bytes(ans, 4, rAUTH_AT);
                                        }
+
                                        EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
                                        //Dbprintf("Sending rAUTH %02x%02x%02x%02x", rAUTH_AT[0],rAUTH_AT[1],rAUTH_AT[2],rAUTH_AT[3]);
                                        cardSTATE = MFEMUL_AUTH1;
                                        EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
                                        //Dbprintf("Sending rAUTH %02x%02x%02x%02x", rAUTH_AT[0],rAUTH_AT[1],rAUTH_AT[2],rAUTH_AT[3]);
                                        cardSTATE = MFEMUL_AUTH1;
@@ -2550,7 +2585,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                                        mf_crypto1_encrypt(pcs, response, 18, response_par);
                                        EmSendCmdPar(response, 18, response_par);
                                        numReads++;
                                        mf_crypto1_encrypt(pcs, response, 18, response_par);
                                        EmSendCmdPar(response, 18, response_par);
                                        numReads++;
-                                       if(exitAfterNReads > 0 && numReads == exitAfterNReads) {
+                                       if(exitAfterNReads > 0 && numReads >= exitAfterNReads) {
                                                Dbprintf("%d reads done, exiting", numReads);
                                                finished = true;
                                        }
                                                Dbprintf("%d reads done, exiting", numReads);
                                                finished = true;
                                        }
@@ -2670,15 +2705,15 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
        if(flags & FLAG_INTERACTIVE)// Interactive mode flag, means we need to send ACK
        {
                //May just aswell send the collected ar_nr in the response aswell
        if(flags & FLAG_INTERACTIVE)// Interactive mode flag, means we need to send ACK
        {
                //May just aswell send the collected ar_nr in the response aswell
-               cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,0,0,&ar_nr_responses,ar_nr_collected*4*4);
+               cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,1,0,&ar_nr_responses,ar_nr_collected*4*4);
        }
 
        }
 
-       if(flags & FLAG_NR_AR_ATTACK)
+       if(flags & FLAG_NR_AR_ATTACK && MF_DBGLEVEL >= 1 )
        {
        {
-               if(ar_nr_collected > 1) {
+               if(ar_nr_collected > 1 ) {
                        Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:");
                        Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x %08x %08x",
                        Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:");
                        Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x %08x %08x",
-                                        ar_nr_responses[0], // UID
+                                       ar_nr_responses[0], // UID
                                        ar_nr_responses[1], //NT
                                        ar_nr_responses[2], //AR1
                                        ar_nr_responses[3], //NR1
                                        ar_nr_responses[1], //NT
                                        ar_nr_responses[2], //AR1
                                        ar_nr_responses[3], //NR1
@@ -2687,7 +2722,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                                        );
                } else {
                        Dbprintf("Failed to obtain two AR/NR pairs!");
                                        );
                } else {
                        Dbprintf("Failed to obtain two AR/NR pairs!");
-                       if(ar_nr_collected >0) {
+                       if(ar_nr_collected > 0 ) {
                                Dbprintf("Only got these: UID=%08x, nonce=%08x, AR1=%08x, NR1=%08x",
                                                ar_nr_responses[0], // UID
                                                ar_nr_responses[1], //NT
                                Dbprintf("Only got these: UID=%08x, nonce=%08x, AR1=%08x, NR1=%08x",
                                                ar_nr_responses[0], // UID
                                                ar_nr_responses[1], //NT
@@ -2697,7 +2732,8 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                        }
                }
        }
                        }
                }
        }
-       if (MF_DBGLEVEL >= 1)   Dbprintf("Emulator stopped. Tracing: %d  trace length: %d ",    tracing, traceLen);
+       if (MF_DBGLEVEL >= 1)   Dbprintf("Emulator stopped. Tracing: %d  trace length: %d ",    tracing, BigBuf_get_traceLen());
+       
 }
 
 
 }
 
 
@@ -2714,24 +2750,26 @@ void RAMFUNC SniffMifare(uint8_t param) {
        // C(red) A(yellow) B(green)
        LEDsoff();
        // init trace buffer
        // C(red) A(yellow) B(green)
        LEDsoff();
        // init trace buffer
-       iso14a_clear_trace();
-       iso14a_set_tracing(TRUE);
+       clear_trace();
+       set_tracing(TRUE);
 
        // The command (reader -> tag) that we're receiving.
        // The length of a received command will in most cases be no more than 18 bytes.
        // So 32 should be enough!
 
        // The command (reader -> tag) that we're receiving.
        // The length of a received command will in most cases be no more than 18 bytes.
        // So 32 should be enough!
-       uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
-       uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET;
+       uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE];
+       uint8_t receivedCmdPar[MAX_MIFARE_PARITY_SIZE];
        // The response (tag -> reader) that we're receiving.
        // The response (tag -> reader) that we're receiving.
-       uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
-       uint8_t *receivedResponsePar = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET;
-       
+       uint8_t receivedResponse[MAX_MIFARE_FRAME_SIZE];
+       uint8_t receivedResponsePar[MAX_MIFARE_PARITY_SIZE];
+
        // 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;
        
        // 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
-       uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET;
+       // free eventually allocated BigBuf memory
+       BigBuf_free();
+       // allocate the DMA buffer, used to stream samples from the FPGA
+       uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
        uint8_t *data = dmaBuf;
        uint8_t previous_data = 0;
        int maxDataLen = 0;
        uint8_t *data = dmaBuf;
        uint8_t previous_data = 0;
        int maxDataLen = 0;
@@ -2790,7 +2828,7 @@ void RAMFUNC SniffMifare(uint8_t param) {
                // test for length of buffer
                if(dataLen > maxDataLen) {                                      // we are more behind than ever...
                        maxDataLen = dataLen;                                   
                // test for length of buffer
                if(dataLen > maxDataLen) {                                      // we are more behind than ever...
                        maxDataLen = dataLen;                                   
-                       if(dataLen > 400) {
+                       if(dataLen > (9 * DMA_BUFFER_SIZE / 10)) {
                                Dbprintf("blew circular buffer! dataLen=0x%x", dataLen);
                                break;
                        }
                                Dbprintf("blew circular buffer! dataLen=0x%x", dataLen);
                                break;
                        }
@@ -2820,7 +2858,7 @@ void RAMFUNC SniffMifare(uint8_t param) {
                                        if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, TRUE)) break;
 
                                        /* And ready to receive another command. */
                                        if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, TRUE)) break;
 
                                        /* And ready to receive another command. */
-                                       UartReset();
+                                       UartInit(receivedCmd, receivedCmdPar);
                                        
                                        /* And also reset the demod code */
                                        DemodReset();
                                        
                                        /* And also reset the demod code */
                                        DemodReset();
@@ -2837,6 +2875,9 @@ void RAMFUNC SniffMifare(uint8_t param) {
 
                                        // And ready to receive another response.
                                        DemodReset();
 
                                        // And ready to receive another response.
                                        DemodReset();
+
+                                       // And reset the Miller decoder including its (now outdated) input buffer
+                                       UartInit(receivedCmd, receivedCmdPar);
                                }
                                TagIsActive = (Demod.state != DEMOD_UNSYNCD);
                        }
                                }
                                TagIsActive = (Demod.state != DEMOD_UNSYNCD);
                        }
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