]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/iso15693.c
fix: usage and sample text of hf mf cwipe
[proxmark3-svn] / armsrc / iso15693.c
index efb9386f48e1c0df9827d7ae6a9bf02026230739..e11e5a9ccc6e232fa7374bf2c7f5fb1e2390ec66 100644 (file)
@@ -1,71 +1,98 @@
 //-----------------------------------------------------------------------------
+// Jonathan Westhues, split Nov 2006
+// Modified by Greg Jones, Jan 2009
+// Modified by Adrian Dabrowski "atrox", Mar-Sept 2010,Oct 2011
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
 // Routines to support ISO 15693. This includes both the reader software and
 // the `fake tag' modes, but at the moment I've implemented only the reader
 // stuff, and that barely.
-// Jonathan Westhues, split Nov 2006
-
-// Modified by Greg Jones, Jan 2009 to perform modulation onboard in arm rather than on PC
+// Modified to perform modulation onboard in arm rather than on PC
 // Also added additional reader commands (SELECT, READ etc.)
-
 //-----------------------------------------------------------------------------
+// The ISO 15693 describes two transmission modes from reader to tag, and 4 
+// transmission modes from tag to reader. As of Mar 2010 this code only 
+// supports one of each: "1of4" mode from reader to tag, and the highspeed 
+// variant with one subcarrier from card to reader.
+// As long, as the card fully support ISO 15693 this is no problem, since the 
+// reader chooses both data rates, but some non-standard tags do not. Further for 
+// the simulation to work, we will need to support all data rates.
+//
+// VCD (reader) -> VICC (tag)
+// 1 out of 256:
+//     data rate: 1,66 kbit/s (fc/8192) 
+//     used for long range
+// 1 out of 4:
+//     data rate: 26,48 kbit/s (fc/512)
+//     used for short range, high speed
+// 
+// VICC (tag) -> VCD (reader)
+// Modulation:
+//             ASK / one subcarrier (423,75 khz)
+//             FSK / two subcarriers (423,75 khz && 484,28 khz)
+// Data Rates / Modes:
+//     low ASK: 6,62 kbit/s
+//     low FSK: 6.67 kbit/s
+//     high ASK: 26,48 kbit/s
+//     high FSK: 26,69 kbit/s
+//-----------------------------------------------------------------------------
+// added "1 out of 256" mode (for VCD->PICC) - atrox 20100911
+
+
+// Random Remarks:
+// *) UID is always used "transmission order" (LSB), which is reverse to display order
+
+// TODO / BUGS / ISSUES:
+// *) writing to tags takes longer: we miss the answer from the tag in most cases
+//    -> tweak the read-timeout times
+// *) signal decoding from the card is still a bit shaky. 
+// *) signal decoding is unable to detect collissions.
+// *) add anti-collission support for inventory-commands 
+// *) read security status of a block
+// *) sniffing and simulation do only support one transmission mode. need to support 
+//             all 8 transmission combinations
+//     *) remove or refactor code under "depricated"
+// *) document all the functions
+
+
 #include "proxmark3.h"
+#include "util.h"
 #include "apps.h"
+#include "string.h"
+#include "iso15693tools.h"
+#include "cmd.h"
 
-// FROM winsrc\prox.h //////////////////////////////////
 #define arraylen(x) (sizeof(x)/sizeof((x)[0]))
 
-//-----------------------------------------------------------------------------
-// Map a sequence of octets (~layer 2 command) into the set of bits to feed
-// to the FPGA, to transmit that command to the tag.
-//-----------------------------------------------------------------------------
+///////////////////////////////////////////////////////////////////////
+// ISO 15693 Part 2 - Air Interface
+// This section basicly contains transmission and receiving of bits
+///////////////////////////////////////////////////////////////////////
+
+#define FrameSOF              Iso15693FrameSOF
+#define Logic0                Iso15693Logic0
+#define Logic1                Iso15693Logic1
+#define FrameEOF              Iso15693FrameEOF
+
+#define Crc(data,datalen)     Iso15693Crc(data,datalen)
+#define AddCrc(data,datalen)  Iso15693AddCrc(data,datalen)
+#define sprintUID(target,uid)  Iso15693sprintUID(target,uid)
+
+int DEBUG=0;
 
-       // The sampling rate is 106.353 ksps/s, for T = 18.8 us
-
-       // SOF defined as
-       // 1) Unmodulated time of 56.64us
-       // 2) 24 pulses of 423.75khz
-       // 3) logic '1' (unmodulated for 18.88us followed by 8 pulses of 423.75khz)
-
-       static const int FrameSOF[] = {
-               -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-               -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-                1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
-                1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
-               -1, -1, -1, -1,
-               -1, -1, -1, -1,
-                1,  1,  1,  1,
-                1,  1,  1,  1
-       };
-       static const int Logic0[] = {
-                1,  1,  1,  1,
-                1,  1,  1,  1,
-               -1, -1, -1, -1,
-               -1, -1, -1, -1
-       };
-       static const int Logic1[] = {
-               -1, -1, -1, -1,
-               -1, -1, -1, -1,
-                1,  1,  1,  1,
-                1,  1,  1,  1
-       };
-
-       // EOF defined as
-       // 1) logic '0' (8 pulses of 423.75khz followed by unmodulated for 18.88us)
-       // 2) 24 pulses of 423.75khz
-       // 3) Unmodulated time of 56.64us
-
-       static const int FrameEOF[] = {
-                1,  1,  1,  1,
-                1,  1,  1,  1,
-               -1, -1, -1, -1,
-               -1, -1, -1, -1,
-                1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
-                1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
-               -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-               -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
-       };
-
-static void CodeIso15693AsReader(BYTE *cmd, int n)
+
+// ---------------------------
+// Signal Processing 
+// ---------------------------
+
+// prepare data using "1 out of 4" code for later transmission
+// resulting data rate is 26,48 kbit/s (fc/512)
+// cmd ... data
+// n ... length of data
+static void CodeIso15693AsReader(uint8_t *cmd, int n)
 {
        int i, j;
 
@@ -76,6 +103,7 @@ static void CodeIso15693AsReader(BYTE *cmd, int n)
                ToSendStuffBit(1);
        }
 
+       // SOF for 1of4
        ToSendStuffBit(0);
        ToSendStuffBit(1);
        ToSendStuffBit(1);
@@ -131,6 +159,7 @@ static void CodeIso15693AsReader(BYTE *cmd, int n)
                        }
                }
        }
+       // EOF
        ToSendStuffBit(1);
        ToSendStuffBit(1);
        ToSendStuffBit(0);
@@ -142,405 +171,274 @@ static void CodeIso15693AsReader(BYTE *cmd, int n)
        }
 }
 
-//-----------------------------------------------------------------------------
-// The CRC used by ISO 15693.
-//-----------------------------------------------------------------------------
-static WORD Crc(BYTE *v, int n)
+// encode data using "1 out of 256" sheme
+// data rate is 1,66 kbit/s (fc/8192) 
+// is designed for more robust communication over longer distances
+static void CodeIso15693AsReader256(uint8_t *cmd, int n)
 {
-       DWORD reg;
        int i, j;
 
-       reg = 0xffff;
+       ToSendReset();
+
+       // Give it a bit of slack at the beginning
+       for(i = 0; i < 24; i++) {
+               ToSendStuffBit(1);
+       }
+
+       // SOF for 1of256
+       ToSendStuffBit(0);
+       ToSendStuffBit(1);
+       ToSendStuffBit(1);
+       ToSendStuffBit(1);
+       ToSendStuffBit(1);
+       ToSendStuffBit(1);
+       ToSendStuffBit(1);
+       ToSendStuffBit(0);
+       
        for(i = 0; i < n; i++) {
-               reg = reg ^ ((DWORD)v[i]);
-               for (j = 0; j < 8; j++) {
-                       if (reg & 0x0001) {
-                               reg = (reg >> 1) ^ 0x8408;
+               for (j = 0; j<=255; j++) {
+                       if (cmd[i]==j) {
+                               ToSendStuffBit(1);
+                               ToSendStuffBit(0);
                        } else {
-                               reg = (reg >> 1);
-                       }
-               }
+                               ToSendStuffBit(1);
+                               ToSendStuffBit(1);
+                       }                       
+               }       
        }
+       // EOF
+       ToSendStuffBit(1);
+       ToSendStuffBit(1);
+       ToSendStuffBit(0);
+       ToSendStuffBit(1);
 
-       return ~reg;
+       // And slack at the end, too.
+       for(i = 0; i < 24; i++) {
+               ToSendStuffBit(1);
+       }
 }
 
-char *strcat(char *dest, const char *src)
+
+// Transmit the command (to the tag) that was placed in ToSend[].
+static void TransmitTo15693Tag(const uint8_t *cmd, int len, int *samples, int *wait)
 {
-       size_t dest_len = strlen(dest);
-       size_t i;
+    int c;
 
-       for (i = 0 ; src[i] != '\0' ; i++)
-               dest[dest_len + i] = src[i];
-       dest[dest_len + i] = '\0';
+//    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
+       if(*wait < 10) { *wait = 10; }
 
-       return dest;
-}
+//    for(c = 0; c < *wait;) {
+//        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+//            AT91C_BASE_SSC->SSC_THR = 0x00;          // For exact timing!
+//            c++;
+//        }
+//        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+//            volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+//            (void)r;
+//        }
+//        WDT_HIT();
+//    }
 
-////////////////////////////////////////// code to do 'itoa'
+    c = 0;
+    for(;;) {
+        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+            AT91C_BASE_SSC->SSC_THR = cmd[c];
+            c++;
+            if(c >= len) {
+                break;
+            }
+        }
+        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+            volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+            (void)r;
+        }
+        WDT_HIT();
+    }
+       *samples = (c + *wait) << 3;
+}
 
-/* reverse:  reverse string s in place */
-void reverse(char s[])
+//-----------------------------------------------------------------------------
+// Transmit the command (to the reader) that was placed in ToSend[].
+//-----------------------------------------------------------------------------
+static void TransmitTo15693Reader(const uint8_t *cmd, int len, int *samples, int *wait)
 {
-    int c, i, j;
+    int c = 0;
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
+       if(*wait < 10) { *wait = 10; }
 
-    for (i = 0, j = strlen(s)-1; i<j; i++, j--) {
-        c = s[i];
-        s[i] = s[j];
-        s[j] = c;
+    for(;;) {
+        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+            AT91C_BASE_SSC->SSC_THR = cmd[c];
+            c++;
+            if(c >= len) {
+                break;
+            }
+        }
+        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+            volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+            (void)r;
+        }
+        WDT_HIT();
     }
+       *samples = (c + *wait) << 3;
 }
 
-/* itoa:  convert n to characters in s */
-void itoa(int n, char s[])
+
+// Read from Tag
+// Parameters:
+//             receivedResponse
+//             maxLen
+//             samples
+//             elapsed
+// returns: 
+//             number of decoded bytes
+static int GetIso15693AnswerFromTag(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed)
 {
-    int i, sign;
-
-    if ((sign = n) < 0)  /* record sign */
-        n = -n;          /* make n positive */
-    i = 0;
-    do {       /* generate digits in reverse order */
-        s[i++] = n % 10 + '0';   /* get next digit */
-    } while ((n /= 10) > 0);     /* delete it */
-    if (sign < 0)
-        s[i++] = '-';
-    s[i] = '\0';
-    reverse(s);
-}
+       int c = 0;
+       uint8_t *dest = BigBuf_get_addr();
+       int getNext = 0;
 
-//////////////////////////////////////// END 'itoa' CODE
+       int8_t prev = 0;
 
-//-----------------------------------------------------------------------------
-// Encode (into the ToSend buffers) an identify request, which is the first
-// thing that you must send to a tag to get a response.
-//-----------------------------------------------------------------------------
-static void BuildIdentifyRequest(void)
-{
-       BYTE cmd[5];
+// NOW READ RESPONSE
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+       //spindelay(60);        // greg - experiment to get rid of some of the 0 byte/failed reads
+       c = 0;
+       getNext = FALSE;
+       for(;;) {
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+                       AT91C_BASE_SSC->SSC_THR = 0x43;
+               }
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+                       int8_t b;
+                       b = (int8_t)AT91C_BASE_SSC->SSC_RHR;
 
-       WORD crc;
-       // one sub-carrier, inventory, 1 slot, fast rate
-       // AFI is at bit 5 (1<<4) when doing an INVENTORY
-       cmd[0] = (1 << 2) | (1 << 5) | (1 << 1);
-       // inventory command code
-       cmd[1] = 0x01;
-       // no mask
-       cmd[2] = 0x00;
-       //Now the CRC
-       crc = Crc(cmd, 3);
-       cmd[3] = crc & 0xff;
-       cmd[4] = crc >> 8;
+                       // The samples are correlations against I and Q versions of the
+                       // tone that the tag AM-modulates, so every other sample is I,
+                       // every other is Q. We just want power, so abs(I) + abs(Q) is
+                       // close to what we want.
+                       if(getNext) {
+                               uint8_t r = ABS(b) + ABS(prev);
 
-       CodeIso15693AsReader(cmd, sizeof(cmd));
-}
+                               dest[c++] = (uint8_t)r;
 
-static void __attribute__((unused)) BuildSysInfoRequest(BYTE *uid)
-{
-       BYTE cmd[12];
+                               if(c >= 2000) {
+                                       break;
+                               }
+                       } else {
+                               prev = b;
+                       }
 
-       WORD crc;
-       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
-       // followed by teh block data
-       // one sub-carrier, inventory, 1 slot, fast rate
-       cmd[0] =  (1 << 5) | (1 << 1); // no SELECT bit
-       // System Information command code
-       cmd[1] = 0x2B;
-       // UID may be optionally specified here
-       // 64-bit UID
-       cmd[2] = 0x32;
-       cmd[3]= 0x4b;
-       cmd[4] = 0x03;
-       cmd[5] = 0x01;
-       cmd[6] = 0x00;
-       cmd[7] = 0x10;
-       cmd[8] = 0x05;
-       cmd[9]= 0xe0; // always e0 (not exactly unique)
-       //Now the CRC
-       crc = Crc(cmd, 10); // the crc needs to be calculated over 2 bytes
-       cmd[10] = crc & 0xff;
-       cmd[11] = crc >> 8;
+                       getNext = !getNext;
+               }
+       }
 
-       CodeIso15693AsReader(cmd, sizeof(cmd));
-}
+       //////////////////////////////////////////
+       /////////// DEMODULATE ///////////////////
+       //////////////////////////////////////////
 
-static void BuildSelectRequest( BYTE uid[])
-{
+       int i, j;
+       int max = 0, maxPos=0;
 
-//     uid[6]=0x31;  // this is getting ignored - the uid array is not happening...
-       BYTE cmd[12];
+       int skip = 4;
 
-       WORD crc;
-       // one sub-carrier, inventory, 1 slot, fast rate
-       //cmd[0] = (1 << 2) | (1 << 5) | (1 << 1);      // INVENTROY FLAGS
-       cmd[0] = (1 << 4) | (1 << 5) | (1 << 1);        // Select and addressed FLAGS
-       // SELECT command code
-       cmd[1] = 0x25;
-       // 64-bit UID
-//     cmd[2] = uid[0];//0x32;
-//     cmd[3]= uid[1];//0x4b;
-//     cmd[4] = uid[2];//0x03;
-//     cmd[5] = uid[3];//0x01;
-//     cmd[6] = uid[4];//0x00;
-//     cmd[7] = uid[5];//0x10;
-//     cmd[8] = uid[6];//0x05;
-       cmd[2] = 0x32;//
-       cmd[3] = 0x4b;
-       cmd[4] = 0x03;
-       cmd[5] = 0x01;
-       cmd[6] = 0x00;
-       cmd[7] = 0x10;
-       cmd[8] = 0x05; // infineon?
+       //      if(GraphTraceLen < 1000) return;        // THIS CHECKS FOR A BUFFER TO SMALL
 
-       cmd[9]= 0xe0; // always e0 (not exactly unique)
+       // First, correlate for SOF
+       for(i = 0; i < 100; i++) {
+               int corr = 0;
+               for(j = 0; j < arraylen(FrameSOF); j += skip) {
+                       corr += FrameSOF[j]*dest[i+(j/skip)];
+               }
+               if(corr > max) {
+                       max = corr;
+                       maxPos = i;
+               }
+       }
+               // Dbprintf("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip));
 
-//     DbpIntegers(cmd[8],cmd[7],cmd[6]);
-       // Now the CRC
-       crc = Crc(cmd, 10); // the crc needs to be calculated over 10 bytes
-       cmd[10] = crc & 0xff;
-       cmd[11] = crc >> 8;
+       int k = 0; // this will be our return value
 
-       CodeIso15693AsReader(cmd, sizeof(cmd));
-}
+       // greg - If correlation is less than 1 then there's little point in continuing
+       if ((max/(arraylen(FrameSOF)/skip)) >= 1)
+       {
 
-static void __attribute__((unused)) BuildReadBlockRequest(BYTE *uid, BYTE blockNumber )
-{
-       BYTE cmd[13];
+               i = maxPos + arraylen(FrameSOF)/skip;
+       
+               uint8_t outBuf[20];
+               memset(outBuf, 0, sizeof(outBuf));
+               uint8_t mask = 0x01;
+               for(;;) {
+                       int corr0 = 0, corr1 = 0, corrEOF = 0;
+                       for(j = 0; j < arraylen(Logic0); j += skip) {
+                               corr0 += Logic0[j]*dest[i+(j/skip)];
+                       }
+                       for(j = 0; j < arraylen(Logic1); j += skip) {
+                               corr1 += Logic1[j]*dest[i+(j/skip)];
+                       }
+                       for(j = 0; j < arraylen(FrameEOF); j += skip) {
+                               corrEOF += FrameEOF[j]*dest[i+(j/skip)];
+                       }
+                       // Even things out by the length of the target waveform.
+                       corr0 *= 4;
+                       corr1 *= 4;
+       
+                       if(corrEOF > corr1 && corrEOF > corr0) {
+                               // Dbprintf("EOF at %d", i);
+                               break;
+                       } else if(corr1 > corr0) {
+                               i += arraylen(Logic1)/skip;
+                               outBuf[k] |= mask;
+                       } else {
+                               i += arraylen(Logic0)/skip;
+                       }
+                       mask <<= 1;
+                       if(mask == 0) {
+                               k++;
+                               mask = 0x01;
+                       }
+                       if((i+(int)arraylen(FrameEOF)) >= 2000) {
+                               DbpString("ran off end!");
+                               break;
+                       }
+               }
+               if(mask != 0x01) { // this happens, when we miss the EOF
+                       // TODO: for some reason this happens quite often
+                       if (DEBUG) Dbprintf("error, uneven octet! (extra bits!) mask=%02x", mask);
+                       if (mask<0x08) k--; // discard the last uneven octet;
+                       // 0x08 is an assumption - but works quite often
+               }
+       //      uint8_t str1 [8];
+       //      itoa(k,str1);
+       //      strncat(str1," octets read",8);
+       
+       //      DbpString(  str1);    // DbpString("%d octets", k);
+       
+       //      for(i = 0; i < k; i+=3) {
+       //              //DbpString("# %2d: %02x ", i, outBuf[i]);
+       //              DbpIntegers(outBuf[i],outBuf[i+1],outBuf[i+2]);
+       //      }
+       
+               for(i = 0; i < k; i++) {
+                       receivedResponse[i] = outBuf[i];
+               }
+       } // "end if correlation > 0"   (max/(arraylen(FrameSOF)/skip))
+       return k; // return the number of bytes demodulated
 
-       WORD crc;
-       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
-       // followed by teh block data
-       // one sub-carrier, inventory, 1 slot, fast rate
-       cmd[0] = (1 << 6)| (1 << 5) | (1 << 1); // no SELECT bit
-       // READ BLOCK command code
-       cmd[1] = 0x20;
-       // UID may be optionally specified here
-       // 64-bit UID
-       cmd[2] = 0x32;
-       cmd[3]= 0x4b;
-       cmd[4] = 0x03;
-       cmd[5] = 0x01;
-       cmd[6] = 0x00;
-       cmd[7] = 0x10;
-       cmd[8] = 0x05;
-       cmd[9]= 0xe0; // always e0 (not exactly unique)
-       // Block number to read
-       cmd[10] = blockNumber;//0x00;
-       //Now the CRC
-       crc = Crc(cmd, 11); // the crc needs to be calculated over 2 bytes
-       cmd[11] = crc & 0xff;
-       cmd[12] = crc >> 8;
+///    DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2));
 
-       CodeIso15693AsReader(cmd, sizeof(cmd));
 }
 
-static void __attribute__((unused)) BuildReadMultiBlockRequest(BYTE *uid)
+
+// Now the GetISO15693 message from sniffing command
+static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed)
 {
-       BYTE cmd[14];
+       int c = 0;
+       uint8_t *dest = BigBuf_get_addr();
+       int getNext = 0;
 
-       WORD crc;
-       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
-       // followed by teh block data
-       // one sub-carrier, inventory, 1 slot, fast rate
-       cmd[0] =  (1 << 5) | (1 << 1); // no SELECT bit
-       // READ Multi BLOCK command code
-       cmd[1] = 0x23;
-       // UID may be optionally specified here
-       // 64-bit UID
-       cmd[2] = 0x32;
-       cmd[3]= 0x4b;
-       cmd[4] = 0x03;
-       cmd[5] = 0x01;
-       cmd[6] = 0x00;
-       cmd[7] = 0x10;
-       cmd[8] = 0x05;
-       cmd[9]= 0xe0; // always e0 (not exactly unique)
-       // First Block number to read
-       cmd[10] = 0x00;
-       // Number of Blocks to read
-       cmd[11] = 0x2f; // read quite a few
-       //Now the CRC
-       crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
-       cmd[12] = crc & 0xff;
-       cmd[13] = crc >> 8;
-
-       CodeIso15693AsReader(cmd, sizeof(cmd));
-}
-
-static void __attribute__((unused)) BuildArbitraryRequest(BYTE *uid,BYTE CmdCode)
-{
-       BYTE cmd[14];
-
-       WORD crc;
-       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
-       // followed by teh block data
-       // one sub-carrier, inventory, 1 slot, fast rate
-       cmd[0] =   (1 << 5) | (1 << 1); // no SELECT bit
-       // READ BLOCK command code
-       cmd[1] = CmdCode;
-       // UID may be optionally specified here
-       // 64-bit UID
-       cmd[2] = 0x32;
-       cmd[3]= 0x4b;
-       cmd[4] = 0x03;
-       cmd[5] = 0x01;
-       cmd[6] = 0x00;
-       cmd[7] = 0x10;
-       cmd[8] = 0x05;
-       cmd[9]= 0xe0; // always e0 (not exactly unique)
-       // Parameter
-       cmd[10] = 0x00;
-       cmd[11] = 0x0a;
-
-//     cmd[12] = 0x00;
-//     cmd[13] = 0x00; //Now the CRC
-       crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
-       cmd[12] = crc & 0xff;
-       cmd[13] = crc >> 8;
-
-       CodeIso15693AsReader(cmd, sizeof(cmd));
-}
-
-static void __attribute__((unused)) BuildArbitraryCustomRequest(BYTE uid[], BYTE CmdCode)
-{
-       BYTE cmd[14];
-
-       WORD crc;
-       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
-       // followed by teh block data
-       // one sub-carrier, inventory, 1 slot, fast rate
-       cmd[0] =   (1 << 5) | (1 << 1); // no SELECT bit
-       // READ BLOCK command code
-       cmd[1] = CmdCode;
-       // UID may be optionally specified here
-       // 64-bit UID
-       cmd[2] = 0x32;
-       cmd[3]= 0x4b;
-       cmd[4] = 0x03;
-       cmd[5] = 0x01;
-       cmd[6] = 0x00;
-       cmd[7] = 0x10;
-       cmd[8] = 0x05;
-       cmd[9]= 0xe0; // always e0 (not exactly unique)
-       // Parameter
-       cmd[10] = 0x05; // for custom codes this must be manufcturer code
-       cmd[11] = 0x00;
-
-//     cmd[12] = 0x00;
-//     cmd[13] = 0x00; //Now the CRC
-       crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
-       cmd[12] = crc & 0xff;
-       cmd[13] = crc >> 8;
-
-       CodeIso15693AsReader(cmd, sizeof(cmd));
-}
-
-/////////////////////////////////////////////////////////////////////////
-// Now the VICC>VCD responses when we are simulating a tag
-////////////////////////////////////////////////////////////////////
-
- static void BuildInventoryResponse(void)
-{
-       BYTE cmd[12];
-
-       WORD crc;
-       // one sub-carrier, inventory, 1 slot, fast rate
-       // AFI is at bit 5 (1<<4) when doing an INVENTORY
-       cmd[0] = 0; //(1 << 2) | (1 << 5) | (1 << 1);
-       cmd[1] = 0;
-       // 64-bit UID
-       cmd[2] = 0x32;
-       cmd[3]= 0x4b;
-       cmd[4] = 0x03;
-       cmd[5] = 0x01;
-       cmd[6] = 0x00;
-       cmd[7] = 0x10;
-       cmd[8] = 0x05;
-       cmd[9]= 0xe0;
-       //Now the CRC
-       crc = Crc(cmd, 10);
-       cmd[10] = crc & 0xff;
-       cmd[11] = crc >> 8;
-
-       CodeIso15693AsReader(cmd, sizeof(cmd));
-}
-
-//-----------------------------------------------------------------------------
-// Transmit the command (to the tag) that was placed in ToSend[].
-//-----------------------------------------------------------------------------
-static void TransmitTo15693Tag(const BYTE *cmd, int len, int *samples, int *wait)
-{
-    int c;
-
-//    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
-       if(*wait < 10) { *wait = 10; }
-
-//    for(c = 0; c < *wait;) {
-//        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-//            AT91C_BASE_SSC->SSC_THR = 0x00;          // For exact timing!
-//            c++;
-//        }
-//        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-//            volatile DWORD r = AT91C_BASE_SSC->SSC_RHR;
-//            (void)r;
-//        }
-//        WDT_HIT();
-//    }
-
-    c = 0;
-    for(;;) {
-        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-            AT91C_BASE_SSC->SSC_THR = cmd[c];
-            c++;
-            if(c >= len) {
-                break;
-            }
-        }
-        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-            volatile DWORD r = AT91C_BASE_SSC->SSC_RHR;
-            (void)r;
-        }
-        WDT_HIT();
-    }
-       *samples = (c + *wait) << 3;
-}
-
-//-----------------------------------------------------------------------------
-// Transmit the command (to the reader) that was placed in ToSend[].
-//-----------------------------------------------------------------------------
-static void TransmitTo15693Reader(const BYTE *cmd, int len, int *samples, int *wait)
-{
-    int c;
-
-//     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR);        // No requirement to energise my coils
-       if(*wait < 10) { *wait = 10; }
-
-    c = 0;
-    for(;;) {
-        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-            AT91C_BASE_SSC->SSC_THR = cmd[c];
-            c++;
-            if(c >= len) {
-                break;
-            }
-        }
-        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-            volatile DWORD r = AT91C_BASE_SSC->SSC_RHR;
-            (void)r;
-        }
-        WDT_HIT();
-    }
-       *samples = (c + *wait) << 3;
-}
-
-static int GetIso15693AnswerFromTag(BYTE *receivedResponse, int maxLen, int *samples, int *elapsed)
-{
-       int c = 0;
-       BYTE *dest = (BYTE *)BigBuf;
-       int getNext = 0;
-
-       SBYTE prev = 0;
+       int8_t prev = 0;
 
 // NOW READ RESPONSE
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
@@ -552,30 +450,18 @@ static int GetIso15693AnswerFromTag(BYTE *receivedResponse, int maxLen, int *sam
                        AT91C_BASE_SSC->SSC_THR = 0x43;
                }
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-                       SBYTE b;
-                       b = (SBYTE)AT91C_BASE_SSC->SSC_RHR;
+                       int8_t b = (int8_t)AT91C_BASE_SSC->SSC_RHR;
 
                        // The samples are correlations against I and Q versions of the
                        // tone that the tag AM-modulates, so every other sample is I,
                        // every other is Q. We just want power, so abs(I) + abs(Q) is
                        // close to what we want.
                        if(getNext) {
-                               SBYTE r;
-
-                               if(b < 0) {
-                                       r = -b;
-                               } else {
-                                       r = b;
-                               }
-                               if(prev < 0) {
-                                       r -= prev;
-                               } else {
-                                       r += prev;
-                               }
+                               uint8_t r = ABS(b) + ABS(prev);
 
-                               dest[c++] = (BYTE)r;
+                               dest[c++] = (uint8_t)r;
 
-                               if(c >= 2000) {
+                               if(c >= 20000) {
                                        break;
                                }
                        } else {
@@ -586,9 +472,9 @@ static int GetIso15693AnswerFromTag(BYTE *receivedResponse, int maxLen, int *sam
                }
        }
 
-//////////////////////////////////////////
-/////////// DEMODULATE ///////////////////
-//////////////////////////////////////////
+       //////////////////////////////////////////
+       /////////// DEMODULATE ///////////////////
+       //////////////////////////////////////////
 
        int i, j;
        int max = 0, maxPos=0;
@@ -598,7 +484,7 @@ static int GetIso15693AnswerFromTag(BYTE *receivedResponse, int maxLen, int *sam
 //     if(GraphTraceLen < 1000) return;        // THIS CHECKS FOR A BUFFER TO SMALL
 
        // First, correlate for SOF
-       for(i = 0; i < 100; i++) {
+       for(i = 0; i < 19000; i++) {
                int corr = 0;
                for(j = 0; j < arraylen(FrameSOF); j += skip) {
                        corr += FrameSOF[j]*dest[i+(j/skip)];
@@ -613,85 +499,118 @@ static int GetIso15693AnswerFromTag(BYTE *receivedResponse, int maxLen, int *sam
        int k = 0; // this will be our return value
 
        // greg - If correlation is less than 1 then there's little point in continuing
-       if ((max/(arraylen(FrameSOF)/skip)) >= 1)
+       if ((max/(arraylen(FrameSOF)/skip)) >= 1)       // THIS SHOULD BE 1
        {
-
-       i = maxPos + arraylen(FrameSOF)/skip;
-
-       BYTE outBuf[20];
-       memset(outBuf, 0, sizeof(outBuf));
-       BYTE mask = 0x01;
-       for(;;) {
-               int corr0 = 0, corr1 = 0, corrEOF = 0;
-               for(j = 0; j < arraylen(Logic0); j += skip) {
-                       corr0 += Logic0[j]*dest[i+(j/skip)];
-               }
-               for(j = 0; j < arraylen(Logic1); j += skip) {
-                       corr1 += Logic1[j]*dest[i+(j/skip)];
-               }
-               for(j = 0; j < arraylen(FrameEOF); j += skip) {
-                       corrEOF += FrameEOF[j]*dest[i+(j/skip)];
-               }
-               // Even things out by the length of the target waveform.
-               corr0 *= 4;
-               corr1 *= 4;
-
-               if(corrEOF > corr1 && corrEOF > corr0) {
-//                     DbpString("EOF at %d", i);
-                       break;
-               } else if(corr1 > corr0) {
-                       i += arraylen(Logic1)/skip;
-                       outBuf[k] |= mask;
-               } else {
-                       i += arraylen(Logic0)/skip;
+       
+               i = maxPos + arraylen(FrameSOF)/skip;
+       
+               uint8_t outBuf[20];
+               memset(outBuf, 0, sizeof(outBuf));
+               uint8_t mask = 0x01;
+               for(;;) {
+                       int corr0 = 0, corr1 = 0, corrEOF = 0;
+                       for(j = 0; j < arraylen(Logic0); j += skip) {
+                               corr0 += Logic0[j]*dest[i+(j/skip)];
+                       }
+                       for(j = 0; j < arraylen(Logic1); j += skip) {
+                               corr1 += Logic1[j]*dest[i+(j/skip)];
+                       }
+                       for(j = 0; j < arraylen(FrameEOF); j += skip) {
+                               corrEOF += FrameEOF[j]*dest[i+(j/skip)];
+                       }
+                       // Even things out by the length of the target waveform.
+                       corr0 *= 4;
+                       corr1 *= 4;
+       
+                       if(corrEOF > corr1 && corrEOF > corr0) {
+       //                      DbpString("EOF at %d", i);
+                               break;
+                       } else if(corr1 > corr0) {
+                               i += arraylen(Logic1)/skip;
+                               outBuf[k] |= mask;
+                       } else {
+                               i += arraylen(Logic0)/skip;
+                       }
+                       mask <<= 1;
+                       if(mask == 0) {
+                               k++;
+                               mask = 0x01;
+                       }
+                       if((i+(int)arraylen(FrameEOF)) >= 2000) {
+                               DbpString("ran off end!");
+                               break;
+                       }
                }
-               mask <<= 1;
-               if(mask == 0) {
-                       k++;
-                       mask = 0x01;
+               if(mask != 0x01) {
+                       DbpString("sniff: error, uneven octet! (discard extra bits!)");
+       ///             DbpString("   mask=%02x", mask);
                }
-               if((i+(int)arraylen(FrameEOF)) >= 2000) {
-                       DbpString("ran off end!");
-                       break;
+       //      uint8_t str1 [8];
+       //      itoa(k,str1);
+       //      strncat(str1," octets read",8);
+       
+       //      DbpString(  str1);    // DbpString("%d octets", k);
+       
+       //      for(i = 0; i < k; i+=3) {
+       //              //DbpString("# %2d: %02x ", i, outBuf[i]);
+       //              DbpIntegers(outBuf[i],outBuf[i+1],outBuf[i+2]);
+       //      }
+       
+               for(i = 0; i < k; i++) {
+                       receivedResponse[i] = outBuf[i];
                }
-       }
-       if(mask != 0x01) {
-               DbpString("error, uneven octet! (discard extra bits!)");
-///            DbpString("   mask=%02x", mask);
-       }
-//     BYTE str1 [8];
-//     itoa(k,str1);
-//     strcat(str1," octets read");
-
-//     DbpString(  str1);    // DbpString("%d octets", k);
-
-//     for(i = 0; i < k; i+=3) {
-//             //DbpString("# %2d: %02x ", i, outBuf[i]);
-//             DbpIntegers(outBuf[i],outBuf[i+1],outBuf[i+2]);
-//     }
-
-       for(i = 0; i < k; i++) {
-               receivedResponse[i] = outBuf[i];
-       }
        } // "end if correlation > 0"   (max/(arraylen(FrameSOF)/skip))
        return k; // return the number of bytes demodulated
 
 ///    DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2));
-
 }
 
-// Now the GetISO15693 message from sniffing command
-static int GetIso15693AnswerFromSniff(BYTE *receivedResponse, int maxLen, int *samples, int *elapsed)
+
+static void BuildIdentifyRequest(void);
+//-----------------------------------------------------------------------------
+// Start to read an ISO 15693 tag. We send an identify request, then wait
+// for the response. The response is not demodulated, just left in the buffer
+// so that it can be downloaded to a PC and processed there.
+//-----------------------------------------------------------------------------
+void AcquireRawAdcSamplesIso15693(void)
 {
+       uint8_t *dest = BigBuf_get_addr();
+
        int c = 0;
-       BYTE *dest = (BYTE *)BigBuf;
        int getNext = 0;
+       int8_t prev = 0;
 
-       SBYTE prev = 0;
+       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+       BuildIdentifyRequest();
 
-// NOW READ RESPONSE
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+       // Give the tags time to energize
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
-       //spindelay(60);        // greg - experiment to get rid of some of the 0 byte/failed reads
+       SpinDelay(100);
+
+       // Now send the command
+       FpgaSetupSsc();
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
+
+       c = 0;
+       for(;;) {
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+                       AT91C_BASE_SSC->SSC_THR = ToSend[c];
+                       c++;
+                       if(c == ToSendMax+3) {
+                               break;
+                       }
+               }
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+                       volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+                       (void)r;
+               }
+               WDT_HIT();
+       }
+
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+
        c = 0;
        getNext = FALSE;
        for(;;) {
@@ -699,30 +618,19 @@ static int GetIso15693AnswerFromSniff(BYTE *receivedResponse, int maxLen, int *s
                        AT91C_BASE_SSC->SSC_THR = 0x43;
                }
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-                       SBYTE b;
-                       b = (SBYTE)AT91C_BASE_SSC->SSC_RHR;
+                       int8_t b;
+                       b = (int8_t)AT91C_BASE_SSC->SSC_RHR;
 
                        // The samples are correlations against I and Q versions of the
                        // tone that the tag AM-modulates, so every other sample is I,
                        // every other is Q. We just want power, so abs(I) + abs(Q) is
                        // close to what we want.
                        if(getNext) {
-                               SBYTE r;
-
-                               if(b < 0) {
-                                       r = -b;
-                               } else {
-                                       r = b;
-                               }
-                               if(prev < 0) {
-                                       r -= prev;
-                               } else {
-                                       r += prev;
-                               }
+                               uint8_t r = ABS(b) + ABS(prev);
 
-                               dest[c++] = (BYTE)r;
+                               dest[c++] = (uint8_t)r;
 
-                               if(c >= 20000) {
+                               if(c >= 2000) {
                                        break;
                                }
                        } else {
@@ -732,220 +640,346 @@ static int GetIso15693AnswerFromSniff(BYTE *receivedResponse, int maxLen, int *s
                        getNext = !getNext;
                }
        }
+}
 
-//////////////////////////////////////////
-/////////// DEMODULATE ///////////////////
-//////////////////////////////////////////
 
-       int i, j;
-       int max = 0, maxPos=0;
+void RecordRawAdcSamplesIso15693(void)
+{
+       uint8_t *dest = BigBuf_get_addr();
 
-       int skip = 4;
+       int c = 0;
+       int getNext = 0;
+       int8_t prev = 0;
 
-//     if(GraphTraceLen < 1000) return;        // THIS CHECKS FOR A BUFFER TO SMALL
+       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+       // Setup SSC
+       FpgaSetupSsc();
 
-       // First, correlate for SOF
-       for(i = 0; i < 19000; i++) {
-               int corr = 0;
-               for(j = 0; j < arraylen(FrameSOF); j += skip) {
-                       corr += FrameSOF[j]*dest[i+(j/skip)];
-               }
-               if(corr > max) {
-                       max = corr;
-                       maxPos = i;
-               }
-       }
-//     DbpString("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip));
+       // Start from off (no field generated)
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       SpinDelay(200);
 
-       int k = 0; // this will be our return value
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
-       // greg - If correlation is less than 1 then there's little point in continuing
-       if ((max/(arraylen(FrameSOF)/skip)) >= 1)       // THIS SHOULD BE 1
-       {
+       SpinDelay(100);
 
-       i = maxPos + arraylen(FrameSOF)/skip;
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
 
-       BYTE outBuf[20];
-       memset(outBuf, 0, sizeof(outBuf));
-       BYTE mask = 0x01;
+       c = 0;
+       getNext = FALSE;
        for(;;) {
-               int corr0 = 0, corr1 = 0, corrEOF = 0;
-               for(j = 0; j < arraylen(Logic0); j += skip) {
-                       corr0 += Logic0[j]*dest[i+(j/skip)];
-               }
-               for(j = 0; j < arraylen(Logic1); j += skip) {
-                       corr1 += Logic1[j]*dest[i+(j/skip)];
-               }
-               for(j = 0; j < arraylen(FrameEOF); j += skip) {
-                       corrEOF += FrameEOF[j]*dest[i+(j/skip)];
-               }
-               // Even things out by the length of the target waveform.
-               corr0 *= 4;
-               corr1 *= 4;
-
-               if(corrEOF > corr1 && corrEOF > corr0) {
-//                     DbpString("EOF at %d", i);
-                       break;
-               } else if(corr1 > corr0) {
-                       i += arraylen(Logic1)/skip;
-                       outBuf[k] |= mask;
-               } else {
-                       i += arraylen(Logic0)/skip;
-               }
-               mask <<= 1;
-               if(mask == 0) {
-                       k++;
-                       mask = 0x01;
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+                       AT91C_BASE_SSC->SSC_THR = 0x43;
                }
-               if((i+(int)arraylen(FrameEOF)) >= 2000) {
-                       DbpString("ran off end!");
-                       break;
+               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+                       int8_t b;
+                       b = (int8_t)AT91C_BASE_SSC->SSC_RHR;
+
+                       // The samples are correlations against I and Q versions of the
+                       // tone that the tag AM-modulates, so every other sample is I,
+                       // every other is Q. We just want power, so abs(I) + abs(Q) is
+                       // close to what we want.
+                       if(getNext) {
+                               uint8_t r = ABS(b) + ABS(prev);
+
+                               dest[c++] = (uint8_t)r;
+
+                               if(c >= 7000) {
+                                       break;
+                               }
+                       } else {
+                               prev = b;
+                       }
+
+                       getNext = !getNext;
+                       WDT_HIT();
                }
        }
-       if(mask != 0x01) {
-               DbpString("error, uneven octet! (discard extra bits!)");
-///            DbpString("   mask=%02x", mask);
-       }
-//     BYTE str1 [8];
-//     itoa(k,str1);
-//     strcat(str1," octets read");
+       Dbprintf("fin record");
+}
+
+
+// Initialize the proxmark as iso15k reader 
+// (this might produces glitches that confuse some tags
+void Iso15693InitReader() {
+       LED_A_ON();
+       LED_B_ON();
+       LED_C_OFF();
+       LED_D_OFF();
+       
+       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+       // Setup SSC
+       // FpgaSetupSsc();
 
-//     DbpString(  str1);    // DbpString("%d octets", k);
+       // Start from off (no field generated)
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       SpinDelay(10);
 
-//     for(i = 0; i < k; i+=3) {
-//             //DbpString("# %2d: %02x ", i, outBuf[i]);
-//             DbpIntegers(outBuf[i],outBuf[i+1],outBuf[i+2]);
-//     }
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+       FpgaSetupSsc();
 
-       for(i = 0; i < k; i++) {
-               receivedResponse[i] = outBuf[i];
-       }
-       } // "end if correlation > 0"   (max/(arraylen(FrameSOF)/skip))
-       return k; // return the number of bytes demodulated
+       // Give the tags time to energize
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+       SpinDelay(250);
 
-///    DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2));
+       LED_A_ON();
+       LED_B_OFF();
+       LED_C_OFF();
+       LED_D_OFF();
 }
 
-//-----------------------------------------------------------------------------
-// Start to read an ISO 15693 tag. We send an identify request, then wait
-// for the response. The response is not demodulated, just left in the buffer
-// so that it can be downloaded to a PC and processed there.
-//-----------------------------------------------------------------------------
-void AcquireRawAdcSamplesIso15693(void)
+///////////////////////////////////////////////////////////////////////
+// ISO 15693 Part 3 - Air Interface
+// This section basicly contains transmission and receiving of bits
+///////////////////////////////////////////////////////////////////////
+
+// Encode (into the ToSend buffers) an identify request, which is the first
+// thing that you must send to a tag to get a response.
+static void BuildIdentifyRequest(void)
 {
-       int c = 0;
-       BYTE *dest = (BYTE *)BigBuf;
-       int getNext = 0;
+       uint8_t cmd[5];
+
+       uint16_t crc;
+       // one sub-carrier, inventory, 1 slot, fast rate
+       // AFI is at bit 5 (1<<4) when doing an INVENTORY
+       cmd[0] = (1 << 2) | (1 << 5) | (1 << 1);
+       // inventory command code
+       cmd[1] = 0x01;
+       // no mask
+       cmd[2] = 0x00;
+       //Now the CRC
+       crc = Crc(cmd, 3);
+       cmd[3] = crc & 0xff;
+       cmd[4] = crc >> 8;
 
-       SBYTE prev = 0;
+       CodeIso15693AsReader(cmd, sizeof(cmd));
+}
 
-       BuildIdentifyRequest();
+// uid is in transmission order (which is reverse of display order)
+static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber )
+{
+       uint8_t cmd[13];
 
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+       uint16_t crc;
+       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
+       // followed by teh block data
+       // one sub-carrier, inventory, 1 slot, fast rate
+       cmd[0] = (1 << 6)| (1 << 5) | (1 << 1); // no SELECT bit, ADDR bit, OPTION bit
+       // READ BLOCK command code
+       cmd[1] = 0x20;
+       // UID may be optionally specified here
+       // 64-bit UID
+       cmd[2] = uid[0];
+       cmd[3] = uid[1];
+       cmd[4] = uid[2];
+       cmd[5] = uid[3];
+       cmd[6] = uid[4];
+       cmd[7] = uid[5];
+       cmd[8] = uid[6];
+       cmd[9] = uid[7]; // 0xe0; // always e0 (not exactly unique)
+       // Block number to read
+       cmd[10] = blockNumber;//0x00;
+       //Now the CRC
+       crc = Crc(cmd, 11); // the crc needs to be calculated over 12 bytes
+       cmd[11] = crc & 0xff;
+       cmd[12] = crc >> 8;
+
+       CodeIso15693AsReader(cmd, sizeof(cmd));
+}
+
+// Now the VICC>VCD responses when we are simulating a tag
+ static void BuildInventoryResponse( uint8_t *uid)
+{
+       uint8_t cmd[12];
+
+       uint16_t crc;
+       // one sub-carrier, inventory, 1 slot, fast rate
+       // AFI is at bit 5 (1<<4) when doing an INVENTORY
+    //(1 << 2) | (1 << 5) | (1 << 1);
+       cmd[0] = 0; // 
+       cmd[1] = 0; // DSFID (data storage format identifier).  0x00 = not supported
+       // 64-bit UID
+       cmd[2] = uid[7]; //0x32;
+       cmd[3] = uid[6]; //0x4b;
+       cmd[4] = uid[5]; //0x03;
+       cmd[5] = uid[4]; //0x01;
+       cmd[6] = uid[3]; //0x00;
+       cmd[7] = uid[2]; //0x10;
+       cmd[8] = uid[1]; //0x05;
+       cmd[9] = uid[0]; //0xe0;
+       //Now the CRC
+       crc = Crc(cmd, 10);
+       cmd[10] = crc & 0xff;
+       cmd[11] = crc >> 8;
+
+       CodeIso15693AsReader(cmd, sizeof(cmd));
+}
+
+// Universal Method for sending to and recv bytes from a tag
+//     init ... should we initialize the reader?
+//     speed ... 0 low speed, 1 hi speed 
+//     **recv will return you a pointer to the received data
+//     If you do not need the answer use NULL for *recv[] 
+//     return: lenght of received data
+int SendDataTag(uint8_t *send, int sendlen, int init, int speed, uint8_t **recv) {
+
+       int samples = 0;
+       int tsamples = 0;
+       int wait = 0;
+       int elapsed = 0;
+       
+       LED_A_ON();
+       LED_B_ON();
+       LED_C_OFF();
+       LED_D_OFF();
+       
+       if (init) Iso15693InitReader();
+
+       int answerLen=0;
+       uint8_t *answer = BigBuf_get_addr() + 3660;
+       if (recv != NULL) memset(answer, 0, 100);
+
+       if (!speed) {
+               // low speed (1 out of 256)
+               CodeIso15693AsReader256(send, sendlen);
+       } else {
+               // high speed (1 out of 4)
+               CodeIso15693AsReader(send, sendlen);
+       }
+       
+       LED_A_ON();
+       LED_B_OFF();
+       
+       TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  
+       // Now wait for a response
+       if (recv!=NULL) {
+               LED_A_OFF();
+               LED_B_ON();
+               answerLen = GetIso15693AnswerFromTag(answer, 100, &samples, &elapsed) ; 
+               *recv=answer;
+       }
 
-       // Give the tags time to energize
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
-       SpinDelay(100);
+       LED_A_OFF();
+       LED_B_OFF();
+       LED_C_OFF();
+       LED_D_OFF();
+       
+       return answerLen;
+}
 
-       // Now send the command
-       FpgaSetupSsc();
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
 
-       c = 0;
-       for(;;) {
-               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-                       AT91C_BASE_SSC->SSC_THR = ToSend[c];
-                       c++;
-                       if(c == ToSendMax+3) {
-                               break;
+// --------------------------------------------------------------------
+// Debug Functions 
+// --------------------------------------------------------------------
+
+// Decodes a message from a tag and displays its metadata and content
+#define DBD15STATLEN 48
+void DbdecodeIso15693Answer(int len, uint8_t *d) {
+       char status[DBD15STATLEN+1]={0};
+       uint16_t crc;
+
+       if (len>3) {
+               if (d[0]&(1<<3)) 
+                       strncat(status,"ProtExt ",DBD15STATLEN);
+               if (d[0]&1) { 
+                       // error
+                       strncat(status,"Error ",DBD15STATLEN);
+                       switch (d[1]) {
+                               case 0x01: 
+                                       strncat(status,"01:notSupp",DBD15STATLEN);
+                                       break;
+                               case 0x02: 
+                                       strncat(status,"02:notRecog",DBD15STATLEN);
+                                       break;
+                               case 0x03: 
+                                       strncat(status,"03:optNotSupp",DBD15STATLEN);
+                                       break;
+                               case 0x0f: 
+                                       strncat(status,"0f:noInfo",DBD15STATLEN);
+                                       break;
+                               case 0x10: 
+                                       strncat(status,"10:dontExist",DBD15STATLEN);
+                                       break;
+                               case 0x11: 
+                                       strncat(status,"11:lockAgain",DBD15STATLEN);
+                                       break;
+                               case 0x12: 
+                                       strncat(status,"12:locked",DBD15STATLEN);
+                                       break;
+                               case 0x13: 
+                                       strncat(status,"13:progErr",DBD15STATLEN);
+                                       break;
+                               case 0x14: 
+                                       strncat(status,"14:lockErr",DBD15STATLEN);
+                                       break;
+                               default:
+                                       strncat(status,"unknownErr",DBD15STATLEN);
                        }
+                       strncat(status," ",DBD15STATLEN);
+               } else {
+                       strncat(status,"NoErr ",DBD15STATLEN);
                }
-               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-                       volatile DWORD r = AT91C_BASE_SSC->SSC_RHR;
-                       (void)r;
-               }
-               WDT_HIT();
+                       
+               crc=Crc(d,len-2);
+               if ( (( crc & 0xff ) == d[len-2]) && (( crc >> 8 ) == d[len-1]) ) 
+                       strncat(status,"CrcOK",DBD15STATLEN);
+               else
+                       strncat(status,"CrcFail!",DBD15STATLEN); 
+
+               Dbprintf("%s",status);
        }
+}
 
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
-
-       c = 0;
-       getNext = FALSE;
-       for(;;) {
-               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-                       AT91C_BASE_SSC->SSC_THR = 0x43;
-               }
-               if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-                       SBYTE b;
-                       b = (SBYTE)AT91C_BASE_SSC->SSC_RHR;
 
-                       // The samples are correlations against I and Q versions of the
-                       // tone that the tag AM-modulates, so every other sample is I,
-                       // every other is Q. We just want power, so abs(I) + abs(Q) is
-                       // close to what we want.
-                       if(getNext) {
-                               SBYTE r;
 
-                               if(b < 0) {
-                                       r = -b;
-                               } else {
-                                       r = b;
-                               }
-                               if(prev < 0) {
-                                       r -= prev;
-                               } else {
-                                       r += prev;
-                               }
+///////////////////////////////////////////////////////////////////////
+// Functions called via USB/Client
+///////////////////////////////////////////////////////////////////////
 
-                               dest[c++] = (BYTE)r;
+void SetDebugIso15693(uint32_t debug) {
+       DEBUG=debug;
+       Dbprintf("Iso15693 Debug is now %s",DEBUG?"on":"off");
+       return;
+}
 
-                               if(c >= 2000) {
-                                       break;
-                               }
-                       } else {
-                               prev = b;
-                       }
 
-                       getNext = !getNext;
-               }
-       }
-}
 
 //-----------------------------------------------------------------------------
 // Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector
 // all demodulation performed in arm rather than host. - greg
 //-----------------------------------------------------------------------------
-void ReaderIso15693(DWORD parameter)
+void ReaderIso15693(uint32_t parameter)
 {
        LED_A_ON();
        LED_B_ON();
        LED_C_OFF();
        LED_D_OFF();
 
-//DbpString(parameter);
-
-       //BYTE *answer0 = (((BYTE *)BigBuf) + 3560); // allow 100 bytes per reponse (way too much)
-       BYTE *answer1 = (((BYTE *)BigBuf) + 3660); //
-       BYTE *answer2 = (((BYTE *)BigBuf) + 3760);
-       BYTE *answer3 = (((BYTE *)BigBuf) + 3860);
-       //BYTE *TagUID= (((BYTE *)BigBuf) + 3960);              // where we hold the uid for hi15reader
-//     int answerLen0 = 0;
        int answerLen1 = 0;
        int answerLen2 = 0;
        int answerLen3 = 0;
+       int i = 0;
+       int samples = 0;
+       int tsamples = 0;
+       int wait = 0;
+       int elapsed = 0;
+       uint8_t TagUID[8] = {0x00};
 
+       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+
+       uint8_t *answer1 = BigBuf_get_addr() + 3660;
+       uint8_t *answer2 = BigBuf_get_addr() + 3760;
+       uint8_t *answer3 = BigBuf_get_addr() + 3860;
        // Blank arrays
-       memset(BigBuf + 3660, 0, 300);
+       memset(answer1, 0x00, 300);
 
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
        // Setup SSC
        FpgaSetupSsc();
 
        // Start from off (no field generated)
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       SpinDelay(200);
-
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-       FpgaSetupSsc();
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       SpinDelay(200);
 
        // Give the tags time to energize
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
@@ -956,44 +990,19 @@ void ReaderIso15693(DWORD parameter)
        LED_C_OFF();
        LED_D_OFF();
 
-       int samples = 0;
-       int tsamples = 0;
-       int wait = 0;
-       int elapsed = 0;
-
        // FIRST WE RUN AN INVENTORY TO GET THE TAG UID
        // THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME
- BYTE TagUID[7];               // where we hold the uid for hi15reader
-
-//     BuildIdentifyRequest();
-//     //TransmitTo15693Tag(ToSend,ToSendMax+3,&tsamples, &wait);
-//     TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  // No longer ToSendMax+3
-//     // Now wait for a response
-//     responseLen0 = GetIso15693AnswerFromTag(receivedAnswer0, 100, &samples, &elapsed) ;
-//     if (responseLen0 >=12) // we should do a better check than this
-//     {
-//             // really we should check it is a valid mesg
-//             // but for now just grab what we think is the uid
-//             TagUID[0] = receivedAnswer0[2];
-//             TagUID[1] = receivedAnswer0[3];
-//             TagUID[2] = receivedAnswer0[4];
-//             TagUID[3] = receivedAnswer0[5];
-//             TagUID[4] = receivedAnswer0[6];
-//             TagUID[5] = receivedAnswer0[7];
-//             TagUID[6] = receivedAnswer0[8]; // IC Manufacturer code
-//     DbpIntegers(TagUID[6],TagUID[5],TagUID[4]);
-//}
 
        // Now send the IDENTIFY command
        BuildIdentifyRequest();
-       //TransmitTo15693Tag(ToSend,ToSendMax+3,&tsamples, &wait);
-       TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  // No longer ToSendMax+3
+       
+       TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);
+       
        // Now wait for a response
        answerLen1 = GetIso15693AnswerFromTag(answer1, 100, &samples, &elapsed) ;
 
        if (answerLen1 >=12) // we should do a better check than this
        {
-
                TagUID[0] = answer1[2];
                TagUID[1] = answer1[3];
                TagUID[2] = answer1[4];
@@ -1001,47 +1010,45 @@ void ReaderIso15693(DWORD parameter)
                TagUID[4] = answer1[6];
                TagUID[5] = answer1[7];
                TagUID[6] = answer1[8]; // IC Manufacturer code
-
-               // Now send the SELECT command
-               BuildSelectRequest(TagUID);
-               TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  // No longer ToSendMax+3
-               // Now wait for a response
-               answerLen2 = GetIso15693AnswerFromTag(answer2, 100, &samples, &elapsed);
-
-               // Now send the MULTI READ command
-//             BuildArbitraryRequest(*TagUID,parameter);
-               BuildArbitraryCustomRequest(TagUID,parameter);
-//             BuildReadBlockRequest(*TagUID,parameter);
-//             BuildSysInfoRequest(*TagUID);
-               //TransmitTo15693Tag(ToSend,ToSendMax+3,&tsamples, &wait);
-               TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  // No longer ToSendMax+3
-               // Now wait for a response
-               answerLen3 = GetIso15693AnswerFromTag(answer3, 100, &samples, &elapsed) ;
+               TagUID[7] = answer1[9]; // always E0
 
        }
 
-       Dbprintf("%d octets read from IDENTIFY request: %x %x %x %x %x %x %x %x %x", answerLen1,
-               answer1[0], answer1[1], answer1[2],
-               answer1[3], answer1[4], answer1[5],
-               answer1[6], answer1[7], answer1[8]);
-
-       Dbprintf("%d octets read from SELECT request: %x %x %x %x %x %x %x %x %x", answerLen2,
-               answer2[0], answer2[1], answer2[2],
-               answer2[3], answer2[4], answer2[5],
-               answer2[6], answer2[7], answer2[8]);
-
-       Dbprintf("%d octets read from XXX request: %x %x %x %x %x %x %x %x %x", answerLen3,
-               answer3[0], answer3[1], answer3[2],
-               answer3[3], answer3[4], answer3[5],
-               answer3[6], answer3[7], answer3[8]);
-
-
-//     str2[0]=0;
-//     for(i = 0; i < responseLen3; i++) {
-//             itoa(str1,receivedAnswer3[i]);
-//             strcat(str2,str1);
-//     }
-//     DbpString(str2);
+       Dbprintf("%d octets read from IDENTIFY request:", answerLen1);
+       DbdecodeIso15693Answer(answerLen1,answer1);
+       Dbhexdump(answerLen1,answer1,true);
+
+       // UID is reverse
+       if (answerLen1>=12) 
+               Dbprintf("UID = %02hX%02hX%02hX%02hX%02hX%02hX%02hX%02hX",
+                       TagUID[7],TagUID[6],TagUID[5],TagUID[4],
+                       TagUID[3],TagUID[2],TagUID[1],TagUID[0]);
+
+
+       Dbprintf("%d octets read from SELECT request:", answerLen2);
+       DbdecodeIso15693Answer(answerLen2,answer2);
+       Dbhexdump(answerLen2,answer2,true);
+
+       Dbprintf("%d octets read from XXX request:", answerLen3);
+       DbdecodeIso15693Answer(answerLen3,answer3);
+       Dbhexdump(answerLen3,answer3,true);
+
+       // read all pages
+       if (answerLen1>=12 && DEBUG) {
+               i=0;                    
+               while (i<32) {  // sanity check, assume max 32 pages
+                       BuildReadBlockRequest(TagUID,i);
+             TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  
+         answerLen2 = GetIso15693AnswerFromTag(answer2, 100, &samples, &elapsed);
+                       if (answerLen2>0) {
+                               Dbprintf("READ SINGLE BLOCK %d returned %d octets:",i,answerLen2);
+                               DbdecodeIso15693Answer(answerLen2,answer2);
+                               Dbhexdump(answerLen2,answer2,true);
+                               if ( *((uint32_t*) answer2) == 0x07160101 ) break; // exit on NoPageErr 
+                       } 
+                       i++;
+               } 
+       }
 
        LED_A_OFF();
        LED_B_OFF();
@@ -1049,35 +1056,31 @@ void ReaderIso15693(DWORD parameter)
        LED_D_OFF();
 }
 
-//-----------------------------------------------------------------------------
 // Simulate an ISO15693 TAG, perform anti-collision and then print any reader commands
 // all demodulation performed in arm rather than host. - greg
-//-----------------------------------------------------------------------------
-void SimTagIso15693(DWORD parameter)
+void SimTagIso15693(uint32_t parameter, uint8_t *uid)
 {
        LED_A_ON();
        LED_B_ON();
        LED_C_OFF();
        LED_D_OFF();
 
-       BYTE *answer1 = (((BYTE *)BigBuf) + 3660); //
        int answerLen1 = 0;
+       int samples = 0;
+       int tsamples = 0;
+       int wait = 0;
+       int elapsed = 0;
 
-       // Blank arrays
-       memset(answer1, 0, 100);
-
-       // Setup SSC
-       FpgaSetupSsc();
-
-       // Start from off (no field generated)
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       SpinDelay(200);
+       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 
+       uint8_t *buf = BigBuf_get_addr() + 3660;
+       memset(buf, 0x00, 100);
+       
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
        FpgaSetupSsc();
 
-       // Give the tags time to energize
-//     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);  // NO GOOD FOR SIM TAG!!!!
+       // Start from off (no field generated)
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        SpinDelay(200);
 
        LED_A_OFF();
@@ -1085,27 +1088,254 @@ void SimTagIso15693(DWORD parameter)
        LED_C_ON();
        LED_D_OFF();
 
-       int samples = 0;
-       int tsamples = 0;
-       int wait = 0;
-       int elapsed = 0;
-
-       answerLen1 = GetIso15693AnswerFromSniff(answer1, 100, &samples, &elapsed) ;
+       // Listen to reader
+       answerLen1 = GetIso15693AnswerFromSniff(buf, 100, &samples, &elapsed) ;
 
        if (answerLen1 >=1) // we should do a better check than this
        {
                // Build a suitable reponse to the reader INVENTORY cocmmand
-               BuildInventoryResponse();
+               // not so obsvious, but in the call to BuildInventoryResponse,  the command is copied to the global ToSend buffer used below.
+               
+               BuildInventoryResponse(uid);
+       
                TransmitTo15693Reader(ToSend,ToSendMax, &tsamples, &wait);
        }
 
        Dbprintf("%d octets read from reader command: %x %x %x %x %x %x %x %x %x", answerLen1,
-               answer1[0], answer1[1], answer1[2],
-               answer1[3], answer1[4], answer1[5],
-               answer1[6], answer1[7], answer1[8]);
+               buf[0], buf[1], buf[2], buf[3],
+               buf[4], buf[5], buf[6], buf[7], buf[8]);
+
+       Dbprintf("Simulationg uid: %x %x %x %x %x %x %x %x",
+               uid[0], uid[1], uid[2], uid[3],
+               uid[4], uid[5], uid[6], uid[7]);
 
        LED_A_OFF();
        LED_B_OFF();
        LED_C_OFF();
        LED_D_OFF();
 }
+
+
+// Since there is no standardized way of reading the AFI out of a tag, we will brute force it
+// (some manufactures offer a way to read the AFI, though)
+void BruteforceIso15693Afi(uint32_t speed) 
+{      
+       uint8_t data[20];
+       uint8_t *recv=data;
+       int datalen=0, recvlen=0;
+               
+       Iso15693InitReader();
+       
+       // first without AFI
+       // Tags should respond wihtout AFI and with AFI=0 even when AFI is active
+       
+       data[0]=ISO15_REQ_SUBCARRIER_SINGLE | ISO15_REQ_DATARATE_HIGH | 
+               ISO15_REQ_INVENTORY | ISO15_REQINV_SLOT1;
+       data[1]=ISO15_CMD_INVENTORY;
+       data[2]=0; // mask length
+       datalen=AddCrc(data,3);
+       recvlen=SendDataTag(data,datalen,0,speed,&recv);
+       WDT_HIT();
+       if (recvlen>=12) {
+               Dbprintf("NoAFI UID=%s",sprintUID(NULL,&recv[2]));
+       }
+       
+       // now with AFI
+       
+       data[0]=ISO15_REQ_SUBCARRIER_SINGLE | ISO15_REQ_DATARATE_HIGH | 
+               ISO15_REQ_INVENTORY | ISO15_REQINV_AFI | ISO15_REQINV_SLOT1;
+       data[1]=ISO15_CMD_INVENTORY;
+       data[2]=0; // AFI
+       data[3]=0; // mask length
+       
+       for (int i=0;i<256;i++) {
+               data[2]=i & 0xFF;
+               datalen=AddCrc(data,4);
+               recvlen=SendDataTag(data,datalen,0,speed,&recv);
+               WDT_HIT();
+               if (recvlen>=12) {
+                       Dbprintf("AFI=%i UID=%s",i,sprintUID(NULL,&recv[2]));
+               }
+       }       
+       Dbprintf("AFI Bruteforcing done.");
+       
+}
+
+// Allows to directly send commands to the tag via the client
+void DirectTag15693Command(uint32_t datalen,uint32_t speed, uint32_t recv, uint8_t data[]) {
+
+       int recvlen=0;
+       uint8_t *recvbuf = BigBuf_get_addr();
+//     UsbCommand n;
+       
+       if (DEBUG) {
+               Dbprintf("SEND");
+               Dbhexdump(datalen,data,true);
+       }
+       
+       recvlen=SendDataTag(data,datalen,1,speed,(recv?&recvbuf:NULL));
+
+       if (recv) { 
+               LED_B_ON();
+    cmd_send(CMD_ACK,recvlen>48?48:recvlen,0,0,recvbuf,48);
+               LED_B_OFF();    
+               
+               if (DEBUG) {
+                       Dbprintf("RECV");
+                       DbdecodeIso15693Answer(recvlen,recvbuf); 
+                       Dbhexdump(recvlen,recvbuf,true);
+               }
+       }
+
+}
+
+
+
+
+// --------------------------------------------------------------------
+// -- Misc & deprecated functions
+// --------------------------------------------------------------------
+
+/*
+
+// do not use; has a fix UID
+static void __attribute__((unused)) BuildSysInfoRequest(uint8_t *uid)
+{
+       uint8_t cmd[12];
+
+       uint16_t crc;
+       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
+       // followed by teh block data
+       // one sub-carrier, inventory, 1 slot, fast rate
+       cmd[0] =  (1 << 5) | (1 << 1); // no SELECT bit
+       // System Information command code
+       cmd[1] = 0x2B;
+       // UID may be optionally specified here
+       // 64-bit UID
+       cmd[2] = 0x32;
+       cmd[3]= 0x4b;
+       cmd[4] = 0x03;
+       cmd[5] = 0x01;
+       cmd[6] = 0x00;
+       cmd[7] = 0x10;
+       cmd[8] = 0x05;
+       cmd[9]= 0xe0; // always e0 (not exactly unique)
+       //Now the CRC
+       crc = Crc(cmd, 10); // the crc needs to be calculated over 2 bytes
+       cmd[10] = crc & 0xff;
+       cmd[11] = crc >> 8;
+
+       CodeIso15693AsReader(cmd, sizeof(cmd));
+}
+
+
+// do not use; has a fix UID
+static void __attribute__((unused)) BuildReadMultiBlockRequest(uint8_t *uid)
+{
+       uint8_t cmd[14];
+
+       uint16_t crc;
+       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
+       // followed by teh block data
+       // one sub-carrier, inventory, 1 slot, fast rate
+       cmd[0] =  (1 << 5) | (1 << 1); // no SELECT bit
+       // READ Multi BLOCK command code
+       cmd[1] = 0x23;
+       // UID may be optionally specified here
+       // 64-bit UID
+       cmd[2] = 0x32;
+       cmd[3]= 0x4b;
+       cmd[4] = 0x03;
+       cmd[5] = 0x01;
+       cmd[6] = 0x00;
+       cmd[7] = 0x10;
+       cmd[8] = 0x05;
+       cmd[9]= 0xe0; // always e0 (not exactly unique)
+       // First Block number to read
+       cmd[10] = 0x00;
+       // Number of Blocks to read
+       cmd[11] = 0x2f; // read quite a few
+       //Now the CRC
+       crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
+       cmd[12] = crc & 0xff;
+       cmd[13] = crc >> 8;
+
+       CodeIso15693AsReader(cmd, sizeof(cmd));
+}
+
+// do not use; has a fix UID
+static void __attribute__((unused)) BuildArbitraryRequest(uint8_t *uid,uint8_t CmdCode)
+{
+       uint8_t cmd[14];
+
+       uint16_t crc;
+       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
+       // followed by teh block data
+       // one sub-carrier, inventory, 1 slot, fast rate
+       cmd[0] =   (1 << 5) | (1 << 1); // no SELECT bit
+       // READ BLOCK command code
+       cmd[1] = CmdCode;
+       // UID may be optionally specified here
+       // 64-bit UID
+       cmd[2] = 0x32;
+       cmd[3]= 0x4b;
+       cmd[4] = 0x03;
+       cmd[5] = 0x01;
+       cmd[6] = 0x00;
+       cmd[7] = 0x10;
+       cmd[8] = 0x05;
+       cmd[9]= 0xe0; // always e0 (not exactly unique)
+       // Parameter
+       cmd[10] = 0x00;
+       cmd[11] = 0x0a;
+
+//     cmd[12] = 0x00;
+//     cmd[13] = 0x00; //Now the CRC
+       crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
+       cmd[12] = crc & 0xff;
+       cmd[13] = crc >> 8;
+
+       CodeIso15693AsReader(cmd, sizeof(cmd));
+}
+
+// do not use; has a fix UID
+static void __attribute__((unused)) BuildArbitraryCustomRequest(uint8_t uid[], uint8_t CmdCode)
+{
+       uint8_t cmd[14];
+
+       uint16_t crc;
+       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
+       // followed by teh block data
+       // one sub-carrier, inventory, 1 slot, fast rate
+       cmd[0] =   (1 << 5) | (1 << 1); // no SELECT bit
+       // READ BLOCK command code
+       cmd[1] = CmdCode;
+       // UID may be optionally specified here
+       // 64-bit UID
+       cmd[2] = 0x32;
+       cmd[3]= 0x4b;
+       cmd[4] = 0x03;
+       cmd[5] = 0x01;
+       cmd[6] = 0x00;
+       cmd[7] = 0x10;
+       cmd[8] = 0x05;
+       cmd[9]= 0xe0; // always e0 (not exactly unique)
+       // Parameter
+       cmd[10] = 0x05; // for custom codes this must be manufcturer code
+       cmd[11] = 0x00;
+
+//     cmd[12] = 0x00;
+//     cmd[13] = 0x00; //Now the CRC
+       crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
+       cmd[12] = crc & 0xff;
+       cmd[13] = crc >> 8;
+
+       CodeIso15693AsReader(cmd, sizeof(cmd));
+}
+
+
+
+
+*/
+
+
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