X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f7c64b570c154063916d42bc6abe3a36df8f59f6..e9281ae812bd5b30394c78889034e653373f1397:/armsrc/iso15693.c

diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c
index 62e480c2..94040a85 100644
--- a/armsrc/iso15693.c
+++ b/armsrc/iso15693.c
@@ -1,1190 +1,1389 @@
-//-----------------------------------------------------------------------------
-// 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
-// Also added additional reader commands (SELECT, READ etc.)
-
-//-----------------------------------------------------------------------------
-#include <proxmark3.h>
-#include "apps.h"
-#include <stdio.h>
-#include <stdlib.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.
-//-----------------------------------------------------------------------------
-
-	// 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)
-{
-	int i, j;
-
-	ToSendReset();
-
-	// Give it a bit of slack at the beginning
-	for(i = 0; i < 24; i++) {
-		ToSendStuffBit(1);
-	}
-
-	ToSendStuffBit(0);
-	ToSendStuffBit(1);
-	ToSendStuffBit(1);
-	ToSendStuffBit(1);
-	ToSendStuffBit(1);
-	ToSendStuffBit(0);
-	ToSendStuffBit(1);
-	ToSendStuffBit(1);
-	for(i = 0; i < n; i++) {
-		for(j = 0; j < 8; j += 2) {
-			int these = (cmd[i] >> j) & 3;
-			switch(these) {
-				case 0:
-					ToSendStuffBit(1);
-					ToSendStuffBit(0);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					break;
-				case 1:
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(0);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					break;
-				case 2:
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(0);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					break;
-				case 3:
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(1);
-					ToSendStuffBit(0);
-					break;
-			}
-		}
-	}
-	ToSendStuffBit(1);
-	ToSendStuffBit(1);
-	ToSendStuffBit(0);
-	ToSendStuffBit(1);
-
-	// And slack at the end, too.
-	for(i = 0; i < 24; i++) {
-		ToSendStuffBit(1);
-	}
-}
-
-//-----------------------------------------------------------------------------
-// The CRC used by ISO 15693.
-//-----------------------------------------------------------------------------
-static WORD Crc(BYTE *v, int n)
-{
-	DWORD reg;
-	int i, j;
-
-	reg = 0xffff;
-	for(i = 0; i < n; i++) {
-		reg = reg ^ ((DWORD)v[i]);
-		for (j = 0; j < 8; j++) {
-			if (reg & 0x0001) {
-				reg = (reg >> 1) ^ 0x8408;
-			} else {
-				reg = (reg >> 1);
-			}
-		}
-	}
-
-	return ~reg;
-}
-
-char *strcat(char *dest, const char *src)
-{
-	size_t dest_len = strlen(dest);
-	size_t i;
- 
-	for (i = 0 ; src[i] != '\0' ; i++)
-	        dest[dest_len + i] = src[i];
-	dest[dest_len + i] = '\0';
- 
-	return dest;
-}
-
-////////////////////////////////////////// code to do 'itoa'
-
-/* reverse:  reverse string s in place */
-void reverse(char s[])
-{
-    int c, i, j;
-
-    for (i = 0, j = strlen(s)-1; i<j; i++, j--) {
-        c = s[i];
-        s[i] = s[j];
-        s[j] = c;
-    }
-}
-
-/* itoa:  convert n to characters in s */
-void itoa(int n, char s[])
-{
-    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);
-}
-
-//////////////////////////////////////// END 'itoa' CODE
-
-//-----------------------------------------------------------------------------
-// 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];
-
-	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;
-
-	CodeIso15693AsReader(cmd, sizeof(cmd));
-}
-
-static void BuildSysInfoRequest(BYTE *uid)
-{
-	BYTE cmd[12];
-
-	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;
-
-	CodeIso15693AsReader(cmd, sizeof(cmd));
-}
-
-static void BuildSelectRequest( BYTE uid[])
-{
-
-//	uid[6]=0x31;  // this is getting ignored - the uid array is not happening...
-	BYTE cmd[12];
-
-	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?
-
-	cmd[9]= 0xe0; // always e0 (not exactly unique)
-
-//	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;
-
-	CodeIso15693AsReader(cmd, sizeof(cmd));
-}
-
-static void BuildReadBlockRequest(BYTE *uid, BYTE blockNumber )
-{
-	BYTE cmd[13];
-
-	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;
-
-	CodeIso15693AsReader(cmd, sizeof(cmd));
-}
-
-static void BuildReadMultiBlockRequest(BYTE *uid)
-{
-	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 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 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 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(SSC_STATUS & (SSC_STATUS_TX_READY)) {
-//            SSC_TRANSMIT_HOLDING = 0x00;		// For exact timing!
-//            c++;
-//        }
-//        if(SSC_STATUS & (SSC_STATUS_RX_READY)) {
-//            volatile DWORD r = SSC_RECEIVE_HOLDING;
-//            (void)r;
-//        }
-//        WDT_HIT();
-//    }
-
-    c = 0;
-    for(;;) {
-        if(SSC_STATUS & (SSC_STATUS_TX_READY)) {
-            SSC_TRANSMIT_HOLDING = cmd[c];
-            c++;
-            if(c >= len) {
-                break;
-            }
-        }
-        if(SSC_STATUS & (SSC_STATUS_RX_READY)) {
-            volatile DWORD r = SSC_RECEIVE_HOLDING;
-            (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(SSC_STATUS & (SSC_STATUS_TX_READY)) {
-            SSC_TRANSMIT_HOLDING = cmd[c];
-            c++;
-            if(c >= len) {
-                break;
-            }
-        }
-        if(SSC_STATUS & (SSC_STATUS_RX_READY)) {
-            volatile DWORD r = SSC_RECEIVE_HOLDING;
-            (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;
-
-// 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(SSC_STATUS & (SSC_STATUS_TX_READY)) {
-			SSC_TRANSMIT_HOLDING = 0x43;
-		}
-		if(SSC_STATUS & (SSC_STATUS_RX_READY)) {
-			SBYTE b;
-			b = (SBYTE)SSC_RECEIVE_HOLDING;
-
-			// 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;
-				}
-
-				dest[c++] = (BYTE)r;
-
-				if(c >= 2000) {
-					break;
-				}
-			} else {
-				prev = b;
-			}
-
-			getNext = !getNext;
-		}
-	}
-
-//////////////////////////////////////////
-/////////// DEMODULATE ///////////////////
-//////////////////////////////////////////
-
-	int i, j;
-	int max = 0, maxPos=0;
-
-	int skip = 4;
-
-//	if(GraphTraceLen < 1000) return;	// THIS CHECKS FOR A BUFFER TO SMALL
-
-	// 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;
-		}
-	}
-//	DbpString("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip));
-
-	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)
-	{
-
-	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;
-		}
-		mask <<= 1;
-		if(mask == 0) {
-			k++;
-			mask = 0x01;
-		}
-		if((i+(int)arraylen(FrameEOF)) >= 2000) {
-			DbpString("ran off end!");
-			break;
-		}
-	}
-	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)
-{
-	int c = 0;
-	BYTE *dest = (BYTE *)BigBuf;
-	int getNext = 0;
-
-	SBYTE prev = 0;
-
-// 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(SSC_STATUS & (SSC_STATUS_TX_READY)) {
-			SSC_TRANSMIT_HOLDING = 0x43;
-		}
-		if(SSC_STATUS & (SSC_STATUS_RX_READY)) {
-			SBYTE b;
-			b = (SBYTE)SSC_RECEIVE_HOLDING;
-
-			// 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;
-				}
-
-				dest[c++] = (BYTE)r;
-
-				if(c >= 20000) {
-					break;
-				}
-			} else {
-				prev = b;
-			}
-
-			getNext = !getNext;
-		}
-	}
-
-//////////////////////////////////////////
-/////////// DEMODULATE ///////////////////
-//////////////////////////////////////////
-
-	int i, j;
-	int max = 0, maxPos=0;
-
-	int skip = 4;
-
-//	if(GraphTraceLen < 1000) return;	// THIS CHECKS FOR A BUFFER TO SMALL
-
-	// 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));
-
-	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)	// 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;
-		}
-		mask <<= 1;
-		if(mask == 0) {
-			k++;
-			mask = 0x01;
-		}
-		if((i+(int)arraylen(FrameEOF)) >= 2000) {
-			DbpString("ran off end!");
-			break;
-		}
-	}
-	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));
-}
-
-//-----------------------------------------------------------------------------
-// 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)
-{
-	int c = 0;
-	BYTE *dest = (BYTE *)BigBuf;
-	int getNext = 0;
-
-	SBYTE prev = 0;
-
-	BuildIdentifyRequest();
-
-	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-
-	// Give the tags time to energize
-	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
-	SpinDelay(100);
-
-	// Now send the command
-	FpgaSetupSsc();
-	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
-
-	c = 0;
-	for(;;) {
-		if(SSC_STATUS & (SSC_STATUS_TX_READY)) {
-			SSC_TRANSMIT_HOLDING = ToSend[c];
-			c++;
-			if(c == ToSendMax+3) {
-				break;
-			}
-		}
-		if(SSC_STATUS & (SSC_STATUS_RX_READY)) {
-			volatile DWORD r = SSC_RECEIVE_HOLDING;
-			(void)r;
-		}
-		WDT_HIT();
-	}
-
-	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
-
-	c = 0;
-	getNext = FALSE;
-	for(;;) {
-		if(SSC_STATUS & (SSC_STATUS_TX_READY)) {
-			SSC_TRANSMIT_HOLDING = 0x43;
-		}
-		if(SSC_STATUS & (SSC_STATUS_RX_READY)) {
-			SBYTE b;
-			b = (SBYTE)SSC_RECEIVE_HOLDING;
-
-			// 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;
-				}
-
-				dest[c++] = (BYTE)r;
-
-				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)
-{
-	LED_A_ON();
-	LED_B_ON();
-	LED_C_OFF();
-	LED_D_OFF();
-
-//DbpString(parameter);
-
-	BYTE *receivedAnswer0 = (((BYTE *)BigBuf) + 3560); // allow 100 bytes per reponse (way too much)
-	BYTE *receivedAnswer1 = (((BYTE *)BigBuf) + 3660); //
-	BYTE *receivedAnswer2 = (((BYTE *)BigBuf) + 3760);
-	BYTE *receivedAnswer3 = (((BYTE *)BigBuf) + 3860);
-	//BYTE *TagUID= (((BYTE *)BigBuf) + 3960);		// where we hold the uid for hi15reader
-//	int responseLen0 = 0;
-	int responseLen1 = 0;
-	int responseLen2 = 0;
-	int responseLen3 = 0;
-
-	// Blank arrays
-	int j;
-	for(j = 0; j < 100; j++) {
-		receivedAnswer3[j] = 0;
-		receivedAnswer2[j] =0;
-		receivedAnswer1[j] = 0;
-		receivedAnswer0[j] = 0;
-	}
-
-	// Setup SSC
-	FpgaSetupSsc();
-
-	// Start from off (no field generated)
-    	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-    	SpinDelay(200);
-
-	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-	FpgaSetupSsc();
-
-	// Give the tags time to energize
-	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
-	SpinDelay(200);
-
-	LED_A_ON();
-	LED_B_OFF();
-	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
-	// Now wait for a response
-	responseLen1 = GetIso15693AnswerFromTag(receivedAnswer1, 100, &samples, &elapsed) ;
-
-	if (responseLen1 >=12) // we should do a better check than this
-	{
-
-		TagUID[0] = receivedAnswer1[2];
-		TagUID[1] = receivedAnswer1[3];
-		TagUID[2] = receivedAnswer1[4];
-		TagUID[3] = receivedAnswer1[5];
-		TagUID[4] = receivedAnswer1[6];
-		TagUID[5] = receivedAnswer1[7];
-		TagUID[6] = receivedAnswer1[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
-		responseLen2 = GetIso15693AnswerFromTag(receivedAnswer2, 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
-		responseLen3 = GetIso15693AnswerFromTag(receivedAnswer3, 100, &samples, &elapsed) ;
-
-	}
-
-	char str1 [4];
-	//char str2 [200];
-	int i;
-
-	itoa(responseLen1,str1);
-	strcat(str1," octets read from IDENTIFY request");
-	DbpString(str1);
-	for(i = 0; i < responseLen1; i+=3) {
-		DbpIntegers(receivedAnswer1[i],receivedAnswer1[i+1],receivedAnswer1[i+2]);
-	}
-
-	itoa(responseLen2,str1);
-	strcat(str1," octets read from SELECT request");
-	DbpString(str1);
-	for(i = 0; i < responseLen2; i+=3) {
-		DbpIntegers(receivedAnswer2[i],receivedAnswer2[i+1],receivedAnswer2[i+2]);
-	}
-
-	itoa(responseLen3,str1);
-	strcat(str1," octets read from XXX request");
-	DbpString(str1);
-	for(i = 0; i < responseLen3; i+=3) {
-		DbpIntegers(receivedAnswer3[i],receivedAnswer3[i+1],receivedAnswer3[i+2]);
-	}
-
-//	str2[0]=0;
-//	for(i = 0; i < responseLen3; i++) {
-//		itoa(str1,receivedAnswer3[i]);
-//		strcat(str2,str1);
-//	}
-//	DbpString(str2);
-
-	LED_A_OFF();
-	LED_B_OFF();
-	LED_C_OFF();
-	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)
-{
-	LED_A_ON();
-	LED_B_ON();
-	LED_C_OFF();
-	LED_D_OFF();
-
-//DbpString(parameter);
-
-	BYTE *receivedAnswer0 = (((BYTE *)BigBuf) + 3560); // allow 100 bytes per reponse (way too much)
-	BYTE *receivedAnswer1 = (((BYTE *)BigBuf) + 3660); //
-	BYTE *receivedAnswer2 = (((BYTE *)BigBuf) + 3760);
-	BYTE *receivedAnswer3 = (((BYTE *)BigBuf) + 3860);
-	//BYTE *TagUID= (((BYTE *)BigBuf) + 3960);		// where we hold the uid for hi15reader
-//	int responseLen0 = 0;
-	int responseLen1 = 0;
-//	int responseLen2 = 0;
-//	int responseLen3 = 0;
-
-	// Blank arrays
-	int j;
-	for(j = 0; j < 100; j++) {
-		receivedAnswer3[j] = 0;
-		receivedAnswer2[j] =0;
-		receivedAnswer1[j] = 0;
-		receivedAnswer0[j] = 0;
-	}
-
-	// Setup SSC
-	FpgaSetupSsc();
-
-	// Start from off (no field generated)
-    	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-    	SpinDelay(200);
-
-	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-	FpgaSetupSsc();
-
-	// Give the tags time to energize
-//	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);	// NO GOOD FOR SIM TAG!!!!
-	SpinDelay(200);
-
-	LED_A_OFF();
-	LED_B_OFF();
-	LED_C_ON();
-	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
-
-	// Now send the IDENTIFY command
-	//	BuildIdentifyRequest();
-	//	TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);	// No longer ToSendMax+3
-
-	// Now wait for a command from the reader
-	responseLen1=0;
-	//	while(responseLen1=0) {
-	//		if(BUTTON_PRESS()) break;
-		responseLen1 = GetIso15693AnswerFromSniff(receivedAnswer1, 100, &samples, &elapsed) ;
-	//		}
-
-	if (responseLen1 >=1) // we should do a better check than this
-	{
-		// Build a suitable reponse to the reader INVENTORY cocmmand
-		BuildInventoryResponse();
-		TransmitTo15693Reader(ToSend,ToSendMax,&tsamples, &wait);
-
-		// Now wait for a command from the reader
-//		responseLen2 = GetIso15693AnswerFromTag(receivedAnswer2, 100, &samples, &elapsed);
-
-		// Now wait for a command from the reader
-//		responseLen3 = GetIso15693AnswerFromTag(receivedAnswer3, 100, &samples, &elapsed) ;
-
-	}
-
-	char str1 [4];
-	//char str2 [200];
-	int i;
-
-	itoa(responseLen1,str1);
-	strcat(str1," octets read from reader command");
-	DbpString(str1);
-	for(i = 0; i < responseLen1; i+=3) {
-		DbpIntegers(receivedAnswer1[i],receivedAnswer1[i+1],receivedAnswer1[i+2]);
-	}
-
-//	itoa(responseLen2,str1);
-//	strcat(str1," octets read from SELECT request");
-//	DbpString(str1);
-//	for(i = 0; i < responseLen2; i+=3) {
-//		DbpIntegers(receivedAnswer2[i],receivedAnswer2[i+1],receivedAnswer2[i+2]);
-//	}
-//
-//	itoa(responseLen3,str1);
-//	strcat(str1," octets read from XXX request");
-//	DbpString(str1);
-//	for(i = 0; i < responseLen3; i+=3) {
-//		DbpIntegers(receivedAnswer3[i],receivedAnswer3[i+1],receivedAnswer3[i+2]);
-//	}
-
-//	str2[0]=0;
-//	for(i = 0; i < responseLen3; i++) {
-//		itoa(str1,receivedAnswer3[i]);
-//		strcat(str2,str1);
-//	}
-//	DbpString(str2);
-
-	LED_A_OFF();
-	LED_B_OFF();
-	LED_C_OFF();
-	LED_D_OFF();
-}
+//-----------------------------------------------------------------------------
+// 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.
+// 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"
+
+#define arraylen(x) (sizeof(x)/sizeof((x)[0]))
+
+///////////////////////////////////////////////////////////////////////
+// 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;
+
+
+// ---------------------------
+// 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;
+
+	ToSendReset();
+
+	// Give it a bit of slack at the beginning
+	for(i = 0; i < 24; i++) {
+		ToSendStuffBit(1);
+	}
+
+	// SOF for 1of4
+	ToSendStuffBit(0);
+	ToSendStuffBit(1);
+	ToSendStuffBit(1);
+	ToSendStuffBit(1);
+	ToSendStuffBit(1);
+	ToSendStuffBit(0);
+	ToSendStuffBit(1);
+	ToSendStuffBit(1);
+	for(i = 0; i < n; i++) {
+		for(j = 0; j < 8; j += 2) {
+			int these = (cmd[i] >> j) & 3;
+			switch(these) {
+				case 0:
+					ToSendStuffBit(1);
+					ToSendStuffBit(0);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					break;
+				case 1:
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(0);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					break;
+				case 2:
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(0);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					break;
+				case 3:
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(1);
+					ToSendStuffBit(0);
+					break;
+			}
+		}
+	}
+	// EOF
+	ToSendStuffBit(1);
+	ToSendStuffBit(1);
+	ToSendStuffBit(0);
+	ToSendStuffBit(1);
+
+	// And slack at the end, too.
+	for(i = 0; i < 24; i++) {
+		ToSendStuffBit(1);
+	}
+}
+
+// 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)
+{
+	int i, j;
+
+	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++) {
+		for (j = 0; j<=255; j++) {
+			if (cmd[i]==j) {
+				ToSendStuffBit(1);
+				ToSendStuffBit(0);
+			} else {
+				ToSendStuffBit(1);
+				ToSendStuffBit(1);
+			}			
+		}	
+	}
+	// EOF
+	ToSendStuffBit(1);
+	ToSendStuffBit(1);
+	ToSendStuffBit(0);
+	ToSendStuffBit(1);
+
+	// And slack at the end, too.
+	for(i = 0; i < 24; i++) {
+		ToSendStuffBit(1);
+	}
+}
+
+
+// Transmit the command (to the tag) that was placed in ToSend[].
+static void TransmitTo15693Tag(const uint8_t *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 uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+//            (void)r;
+//        }
+//        WDT_HIT();
+//    }
+
+    c = 0;
+    for(;;) {
+        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+            AT91C_BASE_SSC->SSC_THR = cmd[c];
+            c++;
+            if(c >= len) {
+                break;
+            }
+        }
+        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+            volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+            (void)r;
+        }
+        WDT_HIT();
+    }
+	*samples = (c + *wait) << 3;
+}
+
+//-----------------------------------------------------------------------------
+// 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 = 0;
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
+	if(*wait < 10) { *wait = 10; }
+
+    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;
+}
+
+
+// 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 c = 0;
+	uint8_t *dest = BigBuf_get_addr();
+	int getNext = 0;
+
+	int8_t prev = 0;
+
+// 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;
+
+			// 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) {
+				int8_t r;
+
+				if(b < 0) {
+					r = -b;
+				} else {
+					r = b;
+				}
+				if(prev < 0) {
+					r -= prev;
+				} else {
+					r += prev;
+				}
+
+				dest[c++] = (uint8_t)r;
+
+				if(c >= 2000) {
+					break;
+				}
+			} else {
+				prev = b;
+			}
+
+			getNext = !getNext;
+		}
+	}
+
+	//////////////////////////////////////////
+	/////////// DEMODULATE ///////////////////
+	//////////////////////////////////////////
+
+	int i, j;
+	int max = 0, maxPos=0;
+
+	int skip = 4;
+
+	//	if(GraphTraceLen < 1000) return;	// THIS CHECKS FOR A BUFFER TO SMALL
+
+	// 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;
+		}
+	}
+	//	DbpString("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip));
+
+	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)
+	{
+
+		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;
+			}
+		}
+		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
+
+///	DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2));
+
+}
+
+
+// Now the GetISO15693 message from sniffing command
+static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed)
+{
+	int c = 0;
+	uint8_t *dest = BigBuf_get_addr();
+	int getNext = 0;
+
+	int8_t prev = 0;
+
+// 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 = (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) {
+				int8_t r;
+
+				if(b < 0) {
+					r = -b;
+				} else {
+					r = b;
+				}
+				if(prev < 0) {
+					r -= prev;
+				} else {
+					r += prev;
+				}
+
+				dest[c++] = (uint8_t)r;
+
+				if(c >= 20000) {
+					break;
+				}
+			} else {
+				prev = b;
+			}
+
+			getNext = !getNext;
+		}
+	}
+
+	//////////////////////////////////////////
+	/////////// DEMODULATE ///////////////////
+	//////////////////////////////////////////
+
+	int i, j;
+	int max = 0, maxPos=0;
+
+	int skip = 4;
+
+//	if(GraphTraceLen < 1000) return;	// THIS CHECKS FOR A BUFFER TO SMALL
+
+	// 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));
+
+	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)	// THIS SHOULD BE 1
+	{
+	
+		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;
+			}
+		}
+		if(mask != 0x01) {
+			DbpString("sniff: error, uneven octet! (discard extra bits!)");
+	///		DbpString("   mask=%02x", mask);
+		}
+	//	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
+
+///	DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2));
+}
+
+
+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;
+	int getNext = 0;
+	int8_t prev = 0;
+
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+	BuildIdentifyRequest();
+
+	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+	// Give the tags time to energize
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+	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(;;) {
+		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;
+
+			// 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) {
+				int8_t r;
+
+				if(b < 0) {
+					r = -b;
+				} else {
+					r = b;
+				}
+				if(prev < 0) {
+					r -= prev;
+				} else {
+					r += prev;
+				}
+
+				dest[c++] = (uint8_t)r;
+
+				if(c >= 2000) {
+					break;
+				}
+			} else {
+				prev = b;
+			}
+
+			getNext = !getNext;
+		}
+	}
+}
+
+
+void RecordRawAdcSamplesIso15693(void)
+{
+	uint8_t *dest = BigBuf_get_addr();
+
+	int c = 0;
+	int getNext = 0;
+	int8_t prev = 0;
+
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+	// Setup SSC
+	FpgaSetupSsc();
+
+	// Start from off (no field generated)
+    	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+    	SpinDelay(200);
+
+	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+	SpinDelay(100);
+
+	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)) {
+			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) {
+				int8_t r;
+
+				if(b < 0) {
+					r = -b;
+				} else {
+					r = b;
+				}
+				if(prev < 0) {
+					r -= prev;
+				} else {
+					r += prev;
+				}
+
+				dest[c++] = (uint8_t)r;
+
+				if(c >= 7000) {
+					break;
+				}
+			} else {
+				prev = b;
+			}
+
+			getNext = !getNext;
+			WDT_HIT();
+		}
+	}
+	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();
+
+	// Start from off (no field generated)
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+	SpinDelay(10);
+
+	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+	FpgaSetupSsc();
+
+	// Give the tags time to energize
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+	SpinDelay(250);
+
+	LED_A_ON();
+	LED_B_OFF();
+	LED_C_OFF();
+	LED_D_OFF();
+}
+
+///////////////////////////////////////////////////////////////////////
+// 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)
+{
+	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;
+
+	CodeIso15693AsReader(cmd, sizeof(cmd));
+}
+
+// uid is in transmission order (which is reverse of display order)
+static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber )
+{
+	uint8_t cmd[13];
+
+	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();
+	
+	int answerLen=0;
+	uint8_t *answer = BigBuf_get_addr() + 3660;
+	if (recv != NULL) memset(answer, 0, 100);
+
+	if (init) Iso15693InitReader();
+	
+	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;
+	}
+
+	LED_A_OFF();
+	LED_B_OFF();
+	LED_C_OFF();
+	LED_D_OFF();
+	
+	return answerLen;
+}
+
+
+// --------------------------------------------------------------------
+// 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);
+		}
+			
+		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);
+	}
+}
+
+
+
+///////////////////////////////////////////////////////////////////////
+// Functions called via USB/Client
+///////////////////////////////////////////////////////////////////////
+
+void SetDebugIso15693(uint32_t debug) {
+	DEBUG=debug;
+	Dbprintf("Iso15693 Debug is now %s",DEBUG?"on":"off");
+	return;
+}
+
+
+
+//-----------------------------------------------------------------------------
+// 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(uint32_t parameter)
+{
+	LED_A_ON();
+	LED_B_ON();
+	LED_C_OFF();
+	LED_D_OFF();
+
+	uint8_t *answer1 = BigBuf_get_addr() + 3660;
+	uint8_t *answer2 = BigBuf_get_addr() + 3760;
+	uint8_t *answer3 = BigBuf_get_addr() + 3860;
+
+	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};
+
+
+	// Blank arrays
+	memset(answer1, 0x00, 300);
+
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+
+	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+	// Setup SSC
+	FpgaSetupSsc();
+
+	// Start from off (no field generated)
+    	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+    	SpinDelay(200);
+
+	// Give the tags time to energize
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+	SpinDelay(200);
+
+	LED_A_ON();
+	LED_B_OFF();
+	LED_C_OFF();
+	LED_D_OFF();
+
+	// FIRST WE RUN AN INVENTORY TO GET THE TAG UID
+	// THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME
+
+	// Now send the IDENTIFY command
+	BuildIdentifyRequest();
+	
+	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];
+		TagUID[3] = answer1[5];
+		TagUID[4] = answer1[6];
+		TagUID[5] = answer1[7];
+		TagUID[6] = answer1[8]; // IC Manufacturer code
+		TagUID[7] = answer1[9]; // always E0
+
+	}
+
+	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();
+	LED_C_OFF();
+	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(uint32_t parameter, uint8_t *uid)
+{
+	LED_A_ON();
+	LED_B_ON();
+	LED_C_OFF();
+	LED_D_OFF();
+
+	uint8_t *buf = BigBuf_get_addr() + 3660;
+	
+	int answerLen1 = 0;
+	int samples = 0;
+	int tsamples = 0;
+	int wait = 0;
+	int elapsed = 0;
+
+	memset(buf, 0x00, 100);
+
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+
+	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+	FpgaSetupSsc();
+
+	// Start from off (no field generated)
+    	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+	SpinDelay(200);
+
+	LED_A_OFF();
+	LED_B_OFF();
+	LED_C_ON();
+	LED_D_OFF();
+
+	// 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
+		// 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,
+		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));
+}
+
+
+
+
+*/
+
+