]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/iso15693.c
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[proxmark3-svn] / armsrc / iso15693.c
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-//-----------------------------------------------------------------------------\r
-// Routines to support ISO 15693. This includes both the reader software and\r
-// the `fake tag' modes, but at the moment I've implemented only the reader\r
-// stuff, and that barely.\r
-// Jonathan Westhues, split Nov 2006\r
-\r
-// Modified by Greg Jones, Jan 2009 to perform modulation onboard in arm rather than on PC\r
-// Also added additional reader commands (SELECT, READ etc.)\r
-\r
-//-----------------------------------------------------------------------------\r
-#include <proxmark3.h>\r
-#include "apps.h"\r
-#include <stdio.h>\r
-#include <stdlib.h>\r
-\r
-// FROM winsrc\prox.h //////////////////////////////////\r
-#define arraylen(x) (sizeof(x)/sizeof((x)[0]))\r
-\r
-//-----------------------------------------------------------------------------\r
-// Map a sequence of octets (~layer 2 command) into the set of bits to feed\r
-// to the FPGA, to transmit that command to the tag.\r
-//-----------------------------------------------------------------------------\r
-\r
-       // The sampling rate is 106.353 ksps/s, for T = 18.8 us\r
-\r
-       // SOF defined as\r
-       // 1) Unmodulated time of 56.64us\r
-       // 2) 24 pulses of 423.75khz\r
-       // 3) logic '1' (unmodulated for 18.88us followed by 8 pulses of 423.75khz)\r
-\r
-       static const int FrameSOF[] = {\r
-               -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,\r
-               -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,\r
-                1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,\r
-                1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,\r
-               -1, -1, -1, -1,\r
-               -1, -1, -1, -1,\r
-                1,  1,  1,  1,\r
-                1,  1,  1,  1\r
-       };\r
-       static const int Logic0[] = {\r
-                1,  1,  1,  1,\r
-                1,  1,  1,  1,\r
-               -1, -1, -1, -1,\r
-               -1, -1, -1, -1\r
-       };\r
-       static const int Logic1[] = {\r
-               -1, -1, -1, -1,\r
-               -1, -1, -1, -1,\r
-                1,  1,  1,  1,\r
-                1,  1,  1,  1\r
-       };\r
-\r
-       // EOF defined as\r
-       // 1) logic '0' (8 pulses of 423.75khz followed by unmodulated for 18.88us)\r
-       // 2) 24 pulses of 423.75khz\r
-       // 3) Unmodulated time of 56.64us\r
-\r
-       static const int FrameEOF[] = {\r
-                1,  1,  1,  1,\r
-                1,  1,  1,  1,\r
-               -1, -1, -1, -1,\r
-               -1, -1, -1, -1,\r
-                1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,\r
-                1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,\r
-               -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,\r
-               -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1\r
-       };\r
-\r
-static void CodeIso15693AsReader(BYTE *cmd, int n)\r
-{\r
-       int i, j;\r
-\r
-       ToSendReset();\r
-\r
-       // Give it a bit of slack at the beginning\r
-       for(i = 0; i < 24; i++) {\r
-               ToSendStuffBit(1);\r
-       }\r
-\r
-       ToSendStuffBit(0);\r
-       ToSendStuffBit(1);\r
-       ToSendStuffBit(1);\r
-       ToSendStuffBit(1);\r
-       ToSendStuffBit(1);\r
-       ToSendStuffBit(0);\r
-       ToSendStuffBit(1);\r
-       ToSendStuffBit(1);\r
-       for(i = 0; i < n; i++) {\r
-               for(j = 0; j < 8; j += 2) {\r
-                       int these = (cmd[i] >> j) & 3;\r
-                       switch(these) {\r
-                               case 0:\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(0);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       break;\r
-                               case 1:\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(0);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       break;\r
-                               case 2:\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(0);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       break;\r
-                               case 3:\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(1);\r
-                                       ToSendStuffBit(0);\r
-                                       break;\r
-                       }\r
-               }\r
-       }\r
-       ToSendStuffBit(1);\r
-       ToSendStuffBit(1);\r
-       ToSendStuffBit(0);\r
-       ToSendStuffBit(1);\r
-\r
-       // And slack at the end, too.\r
-       for(i = 0; i < 24; i++) {\r
-               ToSendStuffBit(1);\r
-       }\r
-}\r
-\r
-//-----------------------------------------------------------------------------\r
-// The CRC used by ISO 15693.\r
-//-----------------------------------------------------------------------------\r
-static WORD Crc(BYTE *v, int n)\r
-{\r
-       DWORD reg;\r
-       int i, j;\r
-\r
-       reg = 0xffff;\r
-       for(i = 0; i < n; i++) {\r
-               reg = reg ^ ((DWORD)v[i]);\r
-               for (j = 0; j < 8; j++) {\r
-                       if (reg & 0x0001) {\r
-                               reg = (reg >> 1) ^ 0x8408;\r
-                       } else {\r
-                               reg = (reg >> 1);\r
-                       }\r
-               }\r
-       }\r
-\r
-       return ~reg;\r
-}\r
-\r
-char *strcat(char *dest, const char *src)\r
-{\r
-       size_t dest_len = strlen(dest);\r
-       size_t i;\r
\r
-       for (i = 0 ; src[i] != '\0' ; i++)\r
-               dest[dest_len + i] = src[i];\r
-       dest[dest_len + i] = '\0';\r
\r
-       return dest;\r
-}\r
-\r
-////////////////////////////////////////// code to do 'itoa'\r
-\r
-/* reverse:  reverse string s in place */\r
-void reverse(char s[])\r
-{\r
-    int c, i, j;\r
-\r
-    for (i = 0, j = strlen(s)-1; i<j; i++, j--) {\r
-        c = s[i];\r
-        s[i] = s[j];\r
-        s[j] = c;\r
-    }\r
-}\r
-\r
-/* itoa:  convert n to characters in s */\r
-void itoa(int n, char s[])\r
-{\r
-    int i, sign;\r
-\r
-    if ((sign = n) < 0)  /* record sign */\r
-        n = -n;          /* make n positive */\r
-    i = 0;\r
-    do {       /* generate digits in reverse order */\r
-        s[i++] = n % 10 + '0';   /* get next digit */\r
-    } while ((n /= 10) > 0);     /* delete it */\r
-    if (sign < 0)\r
-        s[i++] = '-';\r
-    s[i] = '\0';\r
-    reverse(s);\r
-}\r
-\r
-//////////////////////////////////////// END 'itoa' CODE\r
-\r
-//-----------------------------------------------------------------------------\r
-// Encode (into the ToSend buffers) an identify request, which is the first\r
-// thing that you must send to a tag to get a response.\r
-//-----------------------------------------------------------------------------\r
-static void BuildIdentifyRequest(void)\r
-{\r
-       BYTE cmd[5];\r
-\r
-       WORD crc;\r
-       // one sub-carrier, inventory, 1 slot, fast rate\r
-       // AFI is at bit 5 (1<<4) when doing an INVENTORY\r
-       cmd[0] = (1 << 2) | (1 << 5) | (1 << 1);\r
-       // inventory command code\r
-       cmd[1] = 0x01;\r
-       // no mask\r
-       cmd[2] = 0x00;\r
-       //Now the CRC\r
-       crc = Crc(cmd, 3);\r
-       cmd[3] = crc & 0xff;\r
-       cmd[4] = crc >> 8;\r
-\r
-       CodeIso15693AsReader(cmd, sizeof(cmd));\r
-}\r
-\r
-static void BuildSysInfoRequest(BYTE *uid)\r
-{\r
-       BYTE cmd[12];\r
-\r
-       WORD crc;\r
-       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block\r
-       // followed by teh block data\r
-       // one sub-carrier, inventory, 1 slot, fast rate\r
-       cmd[0] =  (1 << 5) | (1 << 1); // no SELECT bit\r
-       // System Information command code\r
-       cmd[1] = 0x2B;\r
-       // UID may be optionally specified here\r
-       // 64-bit UID\r
-       cmd[2] = 0x32;\r
-       cmd[3]= 0x4b;\r
-       cmd[4] = 0x03;\r
-       cmd[5] = 0x01;\r
-       cmd[6] = 0x00;\r
-       cmd[7] = 0x10;\r
-       cmd[8] = 0x05;\r
-       cmd[9]= 0xe0; // always e0 (not exactly unique)\r
-       //Now the CRC\r
-       crc = Crc(cmd, 10); // the crc needs to be calculated over 2 bytes\r
-       cmd[10] = crc & 0xff;\r
-       cmd[11] = crc >> 8;\r
-\r
-       CodeIso15693AsReader(cmd, sizeof(cmd));\r
-}\r
-\r
-static void BuildSelectRequest( BYTE uid[])\r
-{\r
-\r
-//     uid[6]=0x31;  // this is getting ignored - the uid array is not happening...\r
-       BYTE cmd[12];\r
-\r
-       WORD crc;\r
-       // one sub-carrier, inventory, 1 slot, fast rate\r
-       //cmd[0] = (1 << 2) | (1 << 5) | (1 << 1);      // INVENTROY FLAGS\r
-       cmd[0] = (1 << 4) | (1 << 5) | (1 << 1);        // Select and addressed FLAGS\r
-       // SELECT command code\r
-       cmd[1] = 0x25;\r
-       // 64-bit UID\r
-//     cmd[2] = uid[0];//0x32;\r
-//     cmd[3]= uid[1];//0x4b;\r
-//     cmd[4] = uid[2];//0x03;\r
-//     cmd[5] = uid[3];//0x01;\r
-//     cmd[6] = uid[4];//0x00;\r
-//     cmd[7] = uid[5];//0x10;\r
-//     cmd[8] = uid[6];//0x05;\r
-       cmd[2] = 0x32;//\r
-       cmd[3] = 0x4b;\r
-       cmd[4] = 0x03;\r
-       cmd[5] = 0x01;\r
-       cmd[6] = 0x00;\r
-       cmd[7] = 0x10;\r
-       cmd[8] = 0x05; // infineon?\r
-\r
-       cmd[9]= 0xe0; // always e0 (not exactly unique)\r
-\r
-//     DbpIntegers(cmd[8],cmd[7],cmd[6]);\r
-       // Now the CRC\r
-       crc = Crc(cmd, 10); // the crc needs to be calculated over 10 bytes\r
-       cmd[10] = crc & 0xff;\r
-       cmd[11] = crc >> 8;\r
-\r
-       CodeIso15693AsReader(cmd, sizeof(cmd));\r
-}\r
-\r
-static void BuildReadBlockRequest(BYTE *uid, BYTE blockNumber )\r
-{\r
-       BYTE cmd[13];\r
-\r
-       WORD crc;\r
-       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block\r
-       // followed by teh block data\r
-       // one sub-carrier, inventory, 1 slot, fast rate\r
-       cmd[0] = (1 << 6)| (1 << 5) | (1 << 1); // no SELECT bit\r
-       // READ BLOCK command code\r
-       cmd[1] = 0x20;\r
-       // UID may be optionally specified here\r
-       // 64-bit UID\r
-       cmd[2] = 0x32;\r
-       cmd[3]= 0x4b;\r
-       cmd[4] = 0x03;\r
-       cmd[5] = 0x01;\r
-       cmd[6] = 0x00;\r
-       cmd[7] = 0x10;\r
-       cmd[8] = 0x05;\r
-       cmd[9]= 0xe0; // always e0 (not exactly unique)\r
-       // Block number to read\r
-       cmd[10] = blockNumber;//0x00;\r
-       //Now the CRC\r
-       crc = Crc(cmd, 11); // the crc needs to be calculated over 2 bytes\r
-       cmd[11] = crc & 0xff;\r
-       cmd[12] = crc >> 8;\r
-\r
-       CodeIso15693AsReader(cmd, sizeof(cmd));\r
-}\r
-\r
-static void BuildReadMultiBlockRequest(BYTE *uid)\r
-{\r
-       BYTE cmd[14];\r
-\r
-       WORD crc;\r
-       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block\r
-       // followed by teh block data\r
-       // one sub-carrier, inventory, 1 slot, fast rate\r
-       cmd[0] =  (1 << 5) | (1 << 1); // no SELECT bit\r
-       // READ Multi BLOCK command code\r
-       cmd[1] = 0x23;\r
-       // UID may be optionally specified here\r
-       // 64-bit UID\r
-       cmd[2] = 0x32;\r
-       cmd[3]= 0x4b;\r
-       cmd[4] = 0x03;\r
-       cmd[5] = 0x01;\r
-       cmd[6] = 0x00;\r
-       cmd[7] = 0x10;\r
-       cmd[8] = 0x05;\r
-       cmd[9]= 0xe0; // always e0 (not exactly unique)\r
-       // First Block number to read\r
-       cmd[10] = 0x00;\r
-       // Number of Blocks to read\r
-       cmd[11] = 0x2f; // read quite a few\r
-       //Now the CRC\r
-       crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes\r
-       cmd[12] = crc & 0xff;\r
-       cmd[13] = crc >> 8;\r
-\r
-       CodeIso15693AsReader(cmd, sizeof(cmd));\r
-}\r
-\r
-static void BuildArbitraryRequest(BYTE *uid,BYTE CmdCode)\r
-{\r
-       BYTE cmd[14];\r
-\r
-       WORD crc;\r
-       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block\r
-       // followed by teh block data\r
-       // one sub-carrier, inventory, 1 slot, fast rate\r
-       cmd[0] =   (1 << 5) | (1 << 1); // no SELECT bit\r
-       // READ BLOCK command code\r
-       cmd[1] = CmdCode;\r
-       // UID may be optionally specified here\r
-       // 64-bit UID\r
-       cmd[2] = 0x32;\r
-       cmd[3]= 0x4b;\r
-       cmd[4] = 0x03;\r
-       cmd[5] = 0x01;\r
-       cmd[6] = 0x00;\r
-       cmd[7] = 0x10;\r
-       cmd[8] = 0x05;\r
-       cmd[9]= 0xe0; // always e0 (not exactly unique)\r
-       // Parameter\r
-       cmd[10] = 0x00;\r
-       cmd[11] = 0x0a;\r
-\r
-//     cmd[12] = 0x00;\r
-//     cmd[13] = 0x00; //Now the CRC\r
-       crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes\r
-       cmd[12] = crc & 0xff;\r
-       cmd[13] = crc >> 8;\r
-\r
-       CodeIso15693AsReader(cmd, sizeof(cmd));\r
-}\r
-\r
-static void BuildArbitraryCustomRequest(BYTE uid[], BYTE CmdCode)\r
-{\r
-       BYTE cmd[14];\r
-\r
-       WORD crc;\r
-       // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block\r
-       // followed by teh block data\r
-       // one sub-carrier, inventory, 1 slot, fast rate\r
-       cmd[0] =   (1 << 5) | (1 << 1); // no SELECT bit\r
-       // READ BLOCK command code\r
-       cmd[1] = CmdCode;\r
-       // UID may be optionally specified here\r
-       // 64-bit UID\r
-       cmd[2] = 0x32;\r
-       cmd[3]= 0x4b;\r
-       cmd[4] = 0x03;\r
-       cmd[5] = 0x01;\r
-       cmd[6] = 0x00;\r
-       cmd[7] = 0x10;\r
-       cmd[8] = 0x05;\r
-       cmd[9]= 0xe0; // always e0 (not exactly unique)\r
-       // Parameter\r
-       cmd[10] = 0x05; // for custom codes this must be manufcturer code\r
-       cmd[11] = 0x00;\r
-\r
-//     cmd[12] = 0x00;\r
-//     cmd[13] = 0x00; //Now the CRC\r
-       crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes\r
-       cmd[12] = crc & 0xff;\r
-       cmd[13] = crc >> 8;\r
-\r
-       CodeIso15693AsReader(cmd, sizeof(cmd));\r
-}\r
-\r
-/////////////////////////////////////////////////////////////////////////\r
-// Now the VICC>VCD responses when we are simulating a tag\r
-////////////////////////////////////////////////////////////////////\r
-\r
- static void BuildInventoryResponse(void)\r
-{\r
-       BYTE cmd[12];\r
-\r
-       WORD crc;\r
-       // one sub-carrier, inventory, 1 slot, fast rate\r
-       // AFI is at bit 5 (1<<4) when doing an INVENTORY\r
-       cmd[0] = 0; //(1 << 2) | (1 << 5) | (1 << 1);\r
-       cmd[1] = 0;\r
-       // 64-bit UID\r
-       cmd[2] = 0x32;\r
-       cmd[3]= 0x4b;\r
-       cmd[4] = 0x03;\r
-       cmd[5] = 0x01;\r
-       cmd[6] = 0x00;\r
-       cmd[7] = 0x10;\r
-       cmd[8] = 0x05;\r
-       cmd[9]= 0xe0;\r
-       //Now the CRC\r
-       crc = Crc(cmd, 10);\r
-       cmd[10] = crc & 0xff;\r
-       cmd[11] = crc >> 8;\r
-\r
-       CodeIso15693AsReader(cmd, sizeof(cmd));\r
-}\r
-\r
-//-----------------------------------------------------------------------------\r
-// Transmit the command (to the tag) that was placed in ToSend[].\r
-//-----------------------------------------------------------------------------\r
-static void TransmitTo15693Tag(const BYTE *cmd, int len, int *samples, int *wait)\r
-{\r
-    int c;\r
-\r
-//    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);\r
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);\r
-       if(*wait < 10) { *wait = 10; }\r
-\r
-//    for(c = 0; c < *wait;) {\r
-//        if(SSC_STATUS & (SSC_STATUS_TX_READY)) {\r
-//            SSC_TRANSMIT_HOLDING = 0x00;             // For exact timing!\r
-//            c++;\r
-//        }\r
-//        if(SSC_STATUS & (SSC_STATUS_RX_READY)) {\r
-//            volatile DWORD r = SSC_RECEIVE_HOLDING;\r
-//            (void)r;\r
-//        }\r
-//        WDT_HIT();\r
-//    }\r
-\r
-    c = 0;\r
-    for(;;) {\r
-        if(SSC_STATUS & (SSC_STATUS_TX_READY)) {\r
-            SSC_TRANSMIT_HOLDING = cmd[c];\r
-            c++;\r
-            if(c >= len) {\r
-                break;\r
-            }\r
-        }\r
-        if(SSC_STATUS & (SSC_STATUS_RX_READY)) {\r
-            volatile DWORD r = SSC_RECEIVE_HOLDING;\r
-            (void)r;\r
-        }\r
-        WDT_HIT();\r
-    }\r
-       *samples = (c + *wait) << 3;\r
-}\r
-\r
-//-----------------------------------------------------------------------------\r
-// Transmit the command (to the reader) that was placed in ToSend[].\r
-//-----------------------------------------------------------------------------\r
-static void TransmitTo15693Reader(const BYTE *cmd, int len, int *samples, int *wait)\r
-{\r
-    int c;\r
-\r
-//     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);\r
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR);        // No requirement to energise my coils\r
-       if(*wait < 10) { *wait = 10; }\r
-\r
-    c = 0;\r
-    for(;;) {\r
-        if(SSC_STATUS & (SSC_STATUS_TX_READY)) {\r
-            SSC_TRANSMIT_HOLDING = cmd[c];\r
-            c++;\r
-            if(c >= len) {\r
-                break;\r
-            }\r
-        }\r
-        if(SSC_STATUS & (SSC_STATUS_RX_READY)) {\r
-            volatile DWORD r = SSC_RECEIVE_HOLDING;\r
-            (void)r;\r
-        }\r
-        WDT_HIT();\r
-    }\r
-       *samples = (c + *wait) << 3;\r
-}\r
-\r
-static int GetIso15693AnswerFromTag(BYTE *receivedResponse, int maxLen, int *samples, int *elapsed)\r
-{\r
-       int c = 0;\r
-       BYTE *dest = (BYTE *)BigBuf;\r
-       int getNext = 0;\r
-\r
-       SBYTE prev = 0;\r
-\r
-// NOW READ RESPONSE\r
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);\r
-       //spindelay(60);        // greg - experiment to get rid of some of the 0 byte/failed reads\r
-       c = 0;\r
-       getNext = FALSE;\r
-       for(;;) {\r
-               if(SSC_STATUS & (SSC_STATUS_TX_READY)) {\r
-                       SSC_TRANSMIT_HOLDING = 0x43;\r
-               }\r
-               if(SSC_STATUS & (SSC_STATUS_RX_READY)) {\r
-                       SBYTE b;\r
-                       b = (SBYTE)SSC_RECEIVE_HOLDING;\r
-\r
-                       // The samples are correlations against I and Q versions of the\r
-                       // tone that the tag AM-modulates, so every other sample is I,\r
-                       // every other is Q. We just want power, so abs(I) + abs(Q) is\r
-                       // close to what we want.\r
-                       if(getNext) {\r
-                               SBYTE r;\r
-\r
-                               if(b < 0) {\r
-                                       r = -b;\r
-                               } else {\r
-                                       r = b;\r
-                               }\r
-                               if(prev < 0) {\r
-                                       r -= prev;\r
-                               } else {\r
-                                       r += prev;\r
-                               }\r
-\r
-                               dest[c++] = (BYTE)r;\r
-\r
-                               if(c >= 2000) {\r
-                                       break;\r
-                               }\r
-                       } else {\r
-                               prev = b;\r
-                       }\r
-\r
-                       getNext = !getNext;\r
-               }\r
-       }\r
-\r
-//////////////////////////////////////////\r
-/////////// DEMODULATE ///////////////////\r
-//////////////////////////////////////////\r
-\r
-       int i, j;\r
-       int max = 0, maxPos=0;\r
-\r
-       int skip = 4;\r
-\r
-//     if(GraphTraceLen < 1000) return;        // THIS CHECKS FOR A BUFFER TO SMALL\r
-\r
-       // First, correlate for SOF\r
-       for(i = 0; i < 100; i++) {\r
-               int corr = 0;\r
-               for(j = 0; j < arraylen(FrameSOF); j += skip) {\r
-                       corr += FrameSOF[j]*dest[i+(j/skip)];\r
-               }\r
-               if(corr > max) {\r
-                       max = corr;\r
-                       maxPos = i;\r
-               }\r
-       }\r
-//     DbpString("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip));\r
-\r
-       int k = 0; // this will be our return value\r
-\r
-       // greg - If correlation is less than 1 then there's little point in continuing\r
-       if ((max/(arraylen(FrameSOF)/skip)) >= 1)\r
-       {\r
-\r
-       i = maxPos + arraylen(FrameSOF)/skip;\r
-\r
-       BYTE outBuf[20];\r
-       memset(outBuf, 0, sizeof(outBuf));\r
-       BYTE mask = 0x01;\r
-       for(;;) {\r
-               int corr0 = 0, corr1 = 0, corrEOF = 0;\r
-               for(j = 0; j < arraylen(Logic0); j += skip) {\r
-                       corr0 += Logic0[j]*dest[i+(j/skip)];\r
-               }\r
-               for(j = 0; j < arraylen(Logic1); j += skip) {\r
-                       corr1 += Logic1[j]*dest[i+(j/skip)];\r
-               }\r
-               for(j = 0; j < arraylen(FrameEOF); j += skip) {\r
-                       corrEOF += FrameEOF[j]*dest[i+(j/skip)];\r
-               }\r
-               // Even things out by the length of the target waveform.\r
-               corr0 *= 4;\r
-               corr1 *= 4;\r
-\r
-               if(corrEOF > corr1 && corrEOF > corr0) {\r
-//                     DbpString("EOF at %d", i);\r
-                       break;\r
-               } else if(corr1 > corr0) {\r
-                       i += arraylen(Logic1)/skip;\r
-                       outBuf[k] |= mask;\r
-               } else {\r
-                       i += arraylen(Logic0)/skip;\r
-               }\r
-               mask <<= 1;\r
-               if(mask == 0) {\r
-                       k++;\r
-                       mask = 0x01;\r
-               }\r
-               if((i+(int)arraylen(FrameEOF)) >= 2000) {\r
-                       DbpString("ran off end!");\r
-                       break;\r
-               }\r
-       }\r
-       if(mask != 0x01) {\r
-               DbpString("error, uneven octet! (discard extra bits!)");\r
-///            DbpString("   mask=%02x", mask);\r
-       }\r
-//     BYTE str1 [8];\r
-//     itoa(k,str1);\r
-//     strcat(str1," octets read");\r
-\r
-//     DbpString(  str1);    // DbpString("%d octets", k);\r
-\r
-//     for(i = 0; i < k; i+=3) {\r
-//             //DbpString("# %2d: %02x ", i, outBuf[i]);\r
-//             DbpIntegers(outBuf[i],outBuf[i+1],outBuf[i+2]);\r
-//     }\r
-\r
-       for(i = 0; i < k; i++) {\r
-               receivedResponse[i] = outBuf[i];\r
-       }\r
-       } // "end if correlation > 0"   (max/(arraylen(FrameSOF)/skip))\r
-       return k; // return the number of bytes demodulated\r
-\r
-///    DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2));\r
-\r
-}\r
-\r
-// Now the GetISO15693 message from sniffing command\r
-static int GetIso15693AnswerFromSniff(BYTE *receivedResponse, int maxLen, int *samples, int *elapsed)\r
-{\r
-       int c = 0;\r
-       BYTE *dest = (BYTE *)BigBuf;\r
-       int getNext = 0;\r
-\r
-       SBYTE prev = 0;\r
-\r
-// NOW READ RESPONSE\r
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);\r
-       //spindelay(60);        // greg - experiment to get rid of some of the 0 byte/failed reads\r
-       c = 0;\r
-       getNext = FALSE;\r
-       for(;;) {\r
-               if(SSC_STATUS & (SSC_STATUS_TX_READY)) {\r
-                       SSC_TRANSMIT_HOLDING = 0x43;\r
-               }\r
-               if(SSC_STATUS & (SSC_STATUS_RX_READY)) {\r
-                       SBYTE b;\r
-                       b = (SBYTE)SSC_RECEIVE_HOLDING;\r
-\r
-                       // The samples are correlations against I and Q versions of the\r
-                       // tone that the tag AM-modulates, so every other sample is I,\r
-                       // every other is Q. We just want power, so abs(I) + abs(Q) is\r
-                       // close to what we want.\r
-                       if(getNext) {\r
-                               SBYTE r;\r
-\r
-                               if(b < 0) {\r
-                                       r = -b;\r
-                               } else {\r
-                                       r = b;\r
-                               }\r
-                               if(prev < 0) {\r
-                                       r -= prev;\r
-                               } else {\r
-                                       r += prev;\r
-                               }\r
-\r
-                               dest[c++] = (BYTE)r;\r
-\r
-                               if(c >= 20000) {\r
-                                       break;\r
-                               }\r
-                       } else {\r
-                               prev = b;\r
-                       }\r
-\r
-                       getNext = !getNext;\r
-               }\r
-       }\r
-\r
-//////////////////////////////////////////\r
-/////////// DEMODULATE ///////////////////\r
-//////////////////////////////////////////\r
-\r
-       int i, j;\r
-       int max = 0, maxPos=0;\r
-\r
-       int skip = 4;\r
-\r
-//     if(GraphTraceLen < 1000) return;        // THIS CHECKS FOR A BUFFER TO SMALL\r
-\r
-       // First, correlate for SOF\r
-       for(i = 0; i < 19000; i++) {\r
-               int corr = 0;\r
-               for(j = 0; j < arraylen(FrameSOF); j += skip) {\r
-                       corr += FrameSOF[j]*dest[i+(j/skip)];\r
-               }\r
-               if(corr > max) {\r
-                       max = corr;\r
-                       maxPos = i;\r
-               }\r
-       }\r
-//     DbpString("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip));\r
-\r
-       int k = 0; // this will be our return value\r
-\r
-       // greg - If correlation is less than 1 then there's little point in continuing\r
-       if ((max/(arraylen(FrameSOF)/skip)) >= 1)       // THIS SHOULD BE 1\r
-       {\r
-\r
-       i = maxPos + arraylen(FrameSOF)/skip;\r
-\r
-       BYTE outBuf[20];\r
-       memset(outBuf, 0, sizeof(outBuf));\r
-       BYTE mask = 0x01;\r
-       for(;;) {\r
-               int corr0 = 0, corr1 = 0, corrEOF = 0;\r
-               for(j = 0; j < arraylen(Logic0); j += skip) {\r
-                       corr0 += Logic0[j]*dest[i+(j/skip)];\r
-               }\r
-               for(j = 0; j < arraylen(Logic1); j += skip) {\r
-                       corr1 += Logic1[j]*dest[i+(j/skip)];\r
-               }\r
-               for(j = 0; j < arraylen(FrameEOF); j += skip) {\r
-                       corrEOF += FrameEOF[j]*dest[i+(j/skip)];\r
-               }\r
-               // Even things out by the length of the target waveform.\r
-               corr0 *= 4;\r
-               corr1 *= 4;\r
-\r
-               if(corrEOF > corr1 && corrEOF > corr0) {\r
-//                     DbpString("EOF at %d", i);\r
-                       break;\r
-               } else if(corr1 > corr0) {\r
-                       i += arraylen(Logic1)/skip;\r
-                       outBuf[k] |= mask;\r
-               } else {\r
-                       i += arraylen(Logic0)/skip;\r
-               }\r
-               mask <<= 1;\r
-               if(mask == 0) {\r
-                       k++;\r
-                       mask = 0x01;\r
-               }\r
-               if((i+(int)arraylen(FrameEOF)) >= 2000) {\r
-                       DbpString("ran off end!");\r
-                       break;\r
-               }\r
-       }\r
-       if(mask != 0x01) {\r
-               DbpString("error, uneven octet! (discard extra bits!)");\r
-///            DbpString("   mask=%02x", mask);\r
-       }\r
-//     BYTE str1 [8];\r
-//     itoa(k,str1);\r
-//     strcat(str1," octets read");\r
-\r
-//     DbpString(  str1);    // DbpString("%d octets", k);\r
-\r
-//     for(i = 0; i < k; i+=3) {\r
-//             //DbpString("# %2d: %02x ", i, outBuf[i]);\r
-//             DbpIntegers(outBuf[i],outBuf[i+1],outBuf[i+2]);\r
-//     }\r
-\r
-       for(i = 0; i < k; i++) {\r
-               receivedResponse[i] = outBuf[i];\r
-       }\r
-       } // "end if correlation > 0"   (max/(arraylen(FrameSOF)/skip))\r
-       return k; // return the number of bytes demodulated\r
-\r
-///    DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2));\r
-}\r
-\r
-//-----------------------------------------------------------------------------\r
-// Start to read an ISO 15693 tag. We send an identify request, then wait\r
-// for the response. The response is not demodulated, just left in the buffer\r
-// so that it can be downloaded to a PC and processed there.\r
-//-----------------------------------------------------------------------------\r
-void AcquireRawAdcSamplesIso15693(void)\r
-{\r
-       int c = 0;\r
-       BYTE *dest = (BYTE *)BigBuf;\r
-       int getNext = 0;\r
-\r
-       SBYTE prev = 0;\r
-\r
-       BuildIdentifyRequest();\r
-\r
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);\r
-\r
-       // Give the tags time to energize\r
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);\r
-       SpinDelay(100);\r
-\r
-       // Now send the command\r
-       FpgaSetupSsc();\r
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);\r
-\r
-       c = 0;\r
-       for(;;) {\r
-               if(SSC_STATUS & (SSC_STATUS_TX_READY)) {\r
-                       SSC_TRANSMIT_HOLDING = ToSend[c];\r
-                       c++;\r
-                       if(c == ToSendMax+3) {\r
-                               break;\r
-                       }\r
-               }\r
-               if(SSC_STATUS & (SSC_STATUS_RX_READY)) {\r
-                       volatile DWORD r = SSC_RECEIVE_HOLDING;\r
-                       (void)r;\r
-               }\r
-               WDT_HIT();\r
-       }\r
-\r
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);\r
-\r
-       c = 0;\r
-       getNext = FALSE;\r
-       for(;;) {\r
-               if(SSC_STATUS & (SSC_STATUS_TX_READY)) {\r
-                       SSC_TRANSMIT_HOLDING = 0x43;\r
-               }\r
-               if(SSC_STATUS & (SSC_STATUS_RX_READY)) {\r
-                       SBYTE b;\r
-                       b = (SBYTE)SSC_RECEIVE_HOLDING;\r
-\r
-                       // The samples are correlations against I and Q versions of the\r
-                       // tone that the tag AM-modulates, so every other sample is I,\r
-                       // every other is Q. We just want power, so abs(I) + abs(Q) is\r
-                       // close to what we want.\r
-                       if(getNext) {\r
-                               SBYTE r;\r
-\r
-                               if(b < 0) {\r
-                                       r = -b;\r
-                               } else {\r
-                                       r = b;\r
-                               }\r
-                               if(prev < 0) {\r
-                                       r -= prev;\r
-                               } else {\r
-                                       r += prev;\r
-                               }\r
-\r
-                               dest[c++] = (BYTE)r;\r
-\r
-                               if(c >= 2000) {\r
-                                       break;\r
-                               }\r
-                       } else {\r
-                               prev = b;\r
-                       }\r
-\r
-                       getNext = !getNext;\r
-               }\r
-       }\r
-}\r
-\r
-//-----------------------------------------------------------------------------\r
-// Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector\r
-// all demodulation performed in arm rather than host. - greg\r
-//-----------------------------------------------------------------------------\r
-void ReaderIso15693(DWORD parameter)\r
-{\r
-       LED_A_ON();\r
-       LED_B_ON();\r
-       LED_C_OFF();\r
-       LED_D_OFF();\r
-\r
-//DbpString(parameter);\r
-\r
-       BYTE *receivedAnswer0 = (((BYTE *)BigBuf) + 3560); // allow 100 bytes per reponse (way too much)\r
-       BYTE *receivedAnswer1 = (((BYTE *)BigBuf) + 3660); //\r
-       BYTE *receivedAnswer2 = (((BYTE *)BigBuf) + 3760);\r
-       BYTE *receivedAnswer3 = (((BYTE *)BigBuf) + 3860);\r
-       //BYTE *TagUID= (((BYTE *)BigBuf) + 3960);              // where we hold the uid for hi15reader\r
-//     int responseLen0 = 0;\r
-       int responseLen1 = 0;\r
-       int responseLen2 = 0;\r
-       int responseLen3 = 0;\r
-\r
-       // Blank arrays\r
-       int j;\r
-       for(j = 0; j < 100; j++) {\r
-               receivedAnswer3[j] = 0;\r
-               receivedAnswer2[j] =0;\r
-               receivedAnswer1[j] = 0;\r
-               receivedAnswer0[j] = 0;\r
-       }\r
-\r
-       // Setup SSC\r
-       FpgaSetupSsc();\r
-\r
-       // Start from off (no field generated)\r
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);\r
-       SpinDelay(200);\r
-\r
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);\r
-       FpgaSetupSsc();\r
-\r
-       // Give the tags time to energize\r
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);\r
-       SpinDelay(200);\r
-\r
-       LED_A_ON();\r
-       LED_B_OFF();\r
-       LED_C_OFF();\r
-       LED_D_OFF();\r
-\r
-       int samples = 0;\r
-       int tsamples = 0;\r
-       int wait = 0;\r
-       int elapsed = 0;\r
-\r
-       // FIRST WE RUN AN INVENTORY TO GET THE TAG UID\r
-       // THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME\r
- BYTE TagUID[7];               // where we hold the uid for hi15reader\r
-\r
-//     BuildIdentifyRequest();\r
-//     //TransmitTo15693Tag(ToSend,ToSendMax+3,&tsamples, &wait);\r
-//     TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  // No longer ToSendMax+3\r
-//     // Now wait for a response\r
-//     responseLen0 = GetIso15693AnswerFromTag(receivedAnswer0, 100, &samples, &elapsed) ;\r
-//     if (responseLen0 >=12) // we should do a better check than this\r
-//     {\r
-//             // really we should check it is a valid mesg\r
-//             // but for now just grab what we think is the uid\r
-//             TagUID[0] = receivedAnswer0[2];\r
-//             TagUID[1] = receivedAnswer0[3];\r
-//             TagUID[2] = receivedAnswer0[4];\r
-//             TagUID[3] = receivedAnswer0[5];\r
-//             TagUID[4] = receivedAnswer0[6];\r
-//             TagUID[5] = receivedAnswer0[7];\r
-//             TagUID[6] = receivedAnswer0[8]; // IC Manufacturer code\r
-//     DbpIntegers(TagUID[6],TagUID[5],TagUID[4]);\r
-//}\r
-\r
-       // Now send the IDENTIFY command\r
-       BuildIdentifyRequest();\r
-       //TransmitTo15693Tag(ToSend,ToSendMax+3,&tsamples, &wait);\r
-       TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  // No longer ToSendMax+3\r
-       // Now wait for a response\r
-       responseLen1 = GetIso15693AnswerFromTag(receivedAnswer1, 100, &samples, &elapsed) ;\r
-\r
-       if (responseLen1 >=12) // we should do a better check than this\r
-       {\r
-\r
-               TagUID[0] = receivedAnswer1[2];\r
-               TagUID[1] = receivedAnswer1[3];\r
-               TagUID[2] = receivedAnswer1[4];\r
-               TagUID[3] = receivedAnswer1[5];\r
-               TagUID[4] = receivedAnswer1[6];\r
-               TagUID[5] = receivedAnswer1[7];\r
-               TagUID[6] = receivedAnswer1[8]; // IC Manufacturer code\r
-\r
-               // Now send the SELECT command\r
-               BuildSelectRequest(TagUID);\r
-               TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  // No longer ToSendMax+3\r
-               // Now wait for a response\r
-               responseLen2 = GetIso15693AnswerFromTag(receivedAnswer2, 100, &samples, &elapsed);\r
-\r
-               // Now send the MULTI READ command\r
-//             BuildArbitraryRequest(*TagUID,parameter);\r
-               BuildArbitraryCustomRequest(TagUID,parameter);\r
-//             BuildReadBlockRequest(*TagUID,parameter);\r
-//             BuildSysInfoRequest(*TagUID);\r
-               //TransmitTo15693Tag(ToSend,ToSendMax+3,&tsamples, &wait);\r
-               TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  // No longer ToSendMax+3\r
-               // Now wait for a response\r
-               responseLen3 = GetIso15693AnswerFromTag(receivedAnswer3, 100, &samples, &elapsed) ;\r
-\r
-       }\r
-\r
-       char str1 [4];\r
-       //char str2 [200];\r
-       int i;\r
-\r
-       itoa(responseLen1,str1);\r
-       strcat(str1," octets read from IDENTIFY request");\r
-       DbpString(str1);\r
-       for(i = 0; i < responseLen1; i+=3) {\r
-               DbpIntegers(receivedAnswer1[i],receivedAnswer1[i+1],receivedAnswer1[i+2]);\r
-       }\r
-\r
-       itoa(responseLen2,str1);\r
-       strcat(str1," octets read from SELECT request");\r
-       DbpString(str1);\r
-       for(i = 0; i < responseLen2; i+=3) {\r
-               DbpIntegers(receivedAnswer2[i],receivedAnswer2[i+1],receivedAnswer2[i+2]);\r
-       }\r
-\r
-       itoa(responseLen3,str1);\r
-       strcat(str1," octets read from XXX request");\r
-       DbpString(str1);\r
-       for(i = 0; i < responseLen3; i+=3) {\r
-               DbpIntegers(receivedAnswer3[i],receivedAnswer3[i+1],receivedAnswer3[i+2]);\r
-       }\r
-\r
-//     str2[0]=0;\r
-//     for(i = 0; i < responseLen3; i++) {\r
-//             itoa(str1,receivedAnswer3[i]);\r
-//             strcat(str2,str1);\r
-//     }\r
-//     DbpString(str2);\r
-\r
-       LED_A_OFF();\r
-       LED_B_OFF();\r
-       LED_C_OFF();\r
-       LED_D_OFF();\r
-}\r
-\r
-//-----------------------------------------------------------------------------\r
-// Simulate an ISO15693 TAG, perform anti-collision and then print any reader commands\r
-// all demodulation performed in arm rather than host. - greg\r
-//-----------------------------------------------------------------------------\r
-void SimTagIso15693(DWORD parameter)\r
-{\r
-       LED_A_ON();\r
-       LED_B_ON();\r
-       LED_C_OFF();\r
-       LED_D_OFF();\r
-\r
-//DbpString(parameter);\r
-\r
-       BYTE *receivedAnswer0 = (((BYTE *)BigBuf) + 3560); // allow 100 bytes per reponse (way too much)\r
-       BYTE *receivedAnswer1 = (((BYTE *)BigBuf) + 3660); //\r
-       BYTE *receivedAnswer2 = (((BYTE *)BigBuf) + 3760);\r
-       BYTE *receivedAnswer3 = (((BYTE *)BigBuf) + 3860);\r
-       //BYTE *TagUID= (((BYTE *)BigBuf) + 3960);              // where we hold the uid for hi15reader\r
-//     int responseLen0 = 0;\r
-       int responseLen1 = 0;\r
-//     int responseLen2 = 0;\r
-//     int responseLen3 = 0;\r
-\r
-       // Blank arrays\r
-       int j;\r
-       for(j = 0; j < 100; j++) {\r
-               receivedAnswer3[j] = 0;\r
-               receivedAnswer2[j] =0;\r
-               receivedAnswer1[j] = 0;\r
-               receivedAnswer0[j] = 0;\r
-       }\r
-\r
-       // Setup SSC\r
-       FpgaSetupSsc();\r
-\r
-       // Start from off (no field generated)\r
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);\r
-       SpinDelay(200);\r
-\r
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);\r
-       FpgaSetupSsc();\r
-\r
-       // Give the tags time to energize\r
-//     FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);  // NO GOOD FOR SIM TAG!!!!\r
-       SpinDelay(200);\r
-\r
-       LED_A_OFF();\r
-       LED_B_OFF();\r
-       LED_C_ON();\r
-       LED_D_OFF();\r
-\r
-       int samples = 0;\r
-       int tsamples = 0;\r
-       int wait = 0;\r
-       int elapsed = 0;\r
-\r
-       // FIRST WE RUN AN INVENTORY TO GET THE TAG UID\r
-       // THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME\r
-       // BYTE TagUID[7];              // where we hold the uid for hi15reader\r
-\r
-       // Now send the IDENTIFY command\r
-       //      BuildIdentifyRequest();\r
-       //      TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);  // No longer ToSendMax+3\r
-\r
-       // Now wait for a command from the reader\r
-       responseLen1=0;\r
-       //      while(responseLen1=0) {\r
-       //              if(BUTTON_PRESS()) break;\r
-               responseLen1 = GetIso15693AnswerFromSniff(receivedAnswer1, 100, &samples, &elapsed) ;\r
-       //              }\r
-\r
-       if (responseLen1 >=1) // we should do a better check than this\r
-       {\r
-               // Build a suitable reponse to the reader INVENTORY cocmmand\r
-               BuildInventoryResponse();\r
-               TransmitTo15693Reader(ToSend,ToSendMax,&tsamples, &wait);\r
-\r
-               // Now wait for a command from the reader\r
-//             responseLen2 = GetIso15693AnswerFromTag(receivedAnswer2, 100, &samples, &elapsed);\r
-\r
-               // Now wait for a command from the reader\r
-//             responseLen3 = GetIso15693AnswerFromTag(receivedAnswer3, 100, &samples, &elapsed) ;\r
-\r
-       }\r
-\r
-       char str1 [4];\r
-       //char str2 [200];\r
-       int i;\r
-\r
-       itoa(responseLen1,str1);\r
-       strcat(str1," octets read from reader command");\r
-       DbpString(str1);\r
-       for(i = 0; i < responseLen1; i+=3) {\r
-               DbpIntegers(receivedAnswer1[i],receivedAnswer1[i+1],receivedAnswer1[i+2]);\r
-       }\r
-\r
-//     itoa(responseLen2,str1);\r
-//     strcat(str1," octets read from SELECT request");\r
-//     DbpString(str1);\r
-//     for(i = 0; i < responseLen2; i+=3) {\r
-//             DbpIntegers(receivedAnswer2[i],receivedAnswer2[i+1],receivedAnswer2[i+2]);\r
-//     }\r
-//\r
-//     itoa(responseLen3,str1);\r
-//     strcat(str1," octets read from XXX request");\r
-//     DbpString(str1);\r
-//     for(i = 0; i < responseLen3; i+=3) {\r
-//             DbpIntegers(receivedAnswer3[i],receivedAnswer3[i+1],receivedAnswer3[i+2]);\r
-//     }\r
-\r
-//     str2[0]=0;\r
-//     for(i = 0; i < responseLen3; i++) {\r
-//             itoa(str1,receivedAnswer3[i]);\r
-//             strcat(str2,str1);\r
-//     }\r
-//     DbpString(str2);\r
-\r
-       LED_A_OFF();\r
-       LED_B_OFF();\r
-       LED_C_OFF();\r
-       LED_D_OFF();\r
-}\r
+//-----------------------------------------------------------------------------
+// Jonathan Westhues, split Nov 2006
+// Modified by Greg Jones, Jan 2009
+//
+// 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.)
+//-----------------------------------------------------------------------------
+
+#include "proxmark3.h"
+#include "util.h"
+#include "apps.h"
+#include "string.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(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);
+       }
+
+       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 uint16_t Crc(uint8_t *v, int n)
+{
+       uint32_t reg;
+       int i, j;
+
+       reg = 0xffff;
+       for(i = 0; i < n; i++) {
+               reg = reg ^ ((uint32_t)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)
+{
+       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));
+}
+
+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));
+}
+
+static void BuildSelectRequest( uint8_t uid[])
+{
+
+//     uid[6]=0x31;  // this is getting ignored - the uid array is not happening...
+       uint8_t cmd[12];
+
+       uint16_t 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 __attribute__((unused)) 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
+       // 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 __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));
+}
+
+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));
+}
+
+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));
+}
+
+/////////////////////////////////////////////////////////////////////////
+// Now the VICC>VCD responses when we are simulating a tag
+////////////////////////////////////////////////////////////////////
+
+ static void BuildInventoryResponse(void)
+{
+       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
+       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 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;
+
+//     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 uint32_t r = AT91C_BASE_SSC->SSC_RHR;
+            (void)r;
+        }
+        WDT_HIT();
+    }
+       *samples = (c + *wait) << 3;
+}
+
+static int GetIso15693AnswerFromTag(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed)
+{
+       int c = 0;
+       uint8_t *dest = (uint8_t *)BigBuf;
+       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) {
+               DbpString("error, uneven octet! (discard extra bits!)");
+///            DbpString("   mask=%02x", mask);
+       }
+//     uint8_t 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(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed)
+{
+       int c = 0;
+       uint8_t *dest = (uint8_t *)BigBuf;
+       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 >= 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("error, uneven octet! (discard extra bits!)");
+///            DbpString("   mask=%02x", mask);
+       }
+//     uint8_t 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;
+       uint8_t *dest = (uint8_t *)BigBuf;
+       int getNext = 0;
+
+       int8_t 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(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;
+               }
+       }
+}
+
+//-----------------------------------------------------------------------------
+// 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();
+
+//DbpString(parameter);
+
+       //uint8_t *answer0 = (((uint8_t *)BigBuf) + 3560); // allow 100 bytes per reponse (way too much)
+       uint8_t *answer1 = (((uint8_t *)BigBuf) + 3660); //
+       uint8_t *answer2 = (((uint8_t *)BigBuf) + 3760);
+       uint8_t *answer3 = (((uint8_t *)BigBuf) + 3860);
+       //uint8_t *TagUID= (((uint8_t *)BigBuf) + 3960);                // where we hold the uid for hi15reader
+//     int answerLen0 = 0;
+       int answerLen1 = 0;
+       int answerLen2 = 0;
+       int answerLen3 = 0;
+
+       // Blank arrays
+       memset(BigBuf + 3660, 0, 300);
+
+       // 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
+ uint8_t 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
+       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
+
+               // 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) ;
+
+       }
+
+       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);
+
+       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)
+{
+       LED_A_ON();
+       LED_B_ON();
+       LED_C_OFF();
+       LED_D_OFF();
+
+       uint8_t *answer1 = (((uint8_t *)BigBuf) + 3660); //
+       int answerLen1 = 0;
+
+       // Blank arrays
+       memset(answer1, 0, 100);
+
+       // 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;
+
+       answerLen1 = GetIso15693AnswerFromSniff(answer1, 100, &samples, &elapsed) ;
+
+       if (answerLen1 >=1) // we should do a better check than this
+       {
+               // Build a suitable reponse to the reader INVENTORY cocmmand
+               BuildInventoryResponse();
+               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]);
+
+       LED_A_OFF();
+       LED_B_OFF();
+       LED_C_OFF();
+       LED_D_OFF();
+}
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