X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/6949aca9fa0e37539fc277bac78e3d7a22117467..f66d28afcc699588612e40359e02d75eb408739c:/armsrc/iso15693.c diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c index 723d297d..5672e66d 100644 --- a/armsrc/iso15693.c +++ b/armsrc/iso15693.c @@ -1,1190 +1,2009 @@ -//----------------------------------------------------------------------------- -// 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 -#include "apps.h" -#include -#include - -// 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 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 __attribute__((unused)) 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 __attribute__((unused)) 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 __attribute__((unused)) 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 __attribute__((unused)) BuildArbitraryRequest(BYTE *uid,BYTE CmdCode) -{ - BYTE cmd[14]; - - WORD crc; - // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block - // followed by teh block data - // one sub-carrier, inventory, 1 slot, fast rate - cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit - // READ BLOCK command code - cmd[1] = CmdCode; - // UID may be optionally specified here - // 64-bit UID - cmd[2] = 0x32; - cmd[3]= 0x4b; - cmd[4] = 0x03; - cmd[5] = 0x01; - cmd[6] = 0x00; - cmd[7] = 0x10; - cmd[8] = 0x05; - cmd[9]= 0xe0; // always e0 (not exactly unique) - // Parameter - cmd[10] = 0x00; - cmd[11] = 0x0a; - -// cmd[12] = 0x00; -// cmd[13] = 0x00; //Now the CRC - crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes - cmd[12] = crc & 0xff; - cmd[13] = crc >> 8; - - CodeIso15693AsReader(cmd, sizeof(cmd)); -} - -static void __attribute__((unused)) BuildArbitraryCustomRequest(BYTE uid[], BYTE CmdCode) -{ - BYTE cmd[14]; - - WORD crc; - // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block - // followed by teh block data - // one sub-carrier, inventory, 1 slot, fast rate - cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit - // READ BLOCK command code - cmd[1] = CmdCode; - // UID may be optionally specified here - // 64-bit UID - cmd[2] = 0x32; - cmd[3]= 0x4b; - cmd[4] = 0x03; - cmd[5] = 0x01; - cmd[6] = 0x00; - cmd[7] = 0x10; - cmd[8] = 0x05; - cmd[9]= 0xe0; // always e0 (not exactly unique) - // Parameter - cmd[10] = 0x05; // for custom codes this must be manufcturer code - cmd[11] = 0x00; - -// cmd[12] = 0x00; -// cmd[13] = 0x00; //Now the CRC - crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes - cmd[12] = crc & 0xff; - cmd[13] = crc >> 8; - - CodeIso15693AsReader(cmd, sizeof(cmd)); -} - -///////////////////////////////////////////////////////////////////////// -// Now the VICC>VCD responses when we are simulating a tag -//////////////////////////////////////////////////////////////////// - - static void BuildInventoryResponse(void) -{ - BYTE cmd[12]; - - WORD crc; - // one sub-carrier, inventory, 1 slot, fast rate - // AFI is at bit 5 (1<<4) when doing an INVENTORY - cmd[0] = 0; //(1 << 2) | (1 << 5) | (1 << 1); - cmd[1] = 0; - // 64-bit UID - cmd[2] = 0x32; - cmd[3]= 0x4b; - cmd[4] = 0x03; - cmd[5] = 0x01; - cmd[6] = 0x00; - cmd[7] = 0x10; - cmd[8] = 0x05; - cmd[9]= 0xe0; - //Now the CRC - crc = Crc(cmd, 10); - cmd[10] = crc & 0xff; - cmd[11] = crc >> 8; - - CodeIso15693AsReader(cmd, sizeof(cmd)); -} - -//----------------------------------------------------------------------------- -// Transmit the command (to the tag) that was placed in ToSend[]. -//----------------------------------------------------------------------------- -static void TransmitTo15693Tag(const BYTE *cmd, int len, int *samples, int *wait) -{ - int c; - -// FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); - if(*wait < 10) { *wait = 10; } - -// for(c = 0; c < *wait;) { -// if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { -// AT91C_BASE_SSC->SSC_THR = 0x00; // For exact timing! -// c++; -// } -// if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { -// volatile DWORD r = AT91C_BASE_SSC->SSC_RHR; -// (void)r; -// } -// WDT_HIT(); -// } - - c = 0; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = cmd[c]; - c++; - if(c >= len) { - break; - } - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile DWORD r = AT91C_BASE_SSC->SSC_RHR; - (void)r; - } - WDT_HIT(); - } - *samples = (c + *wait) << 3; -} - -//----------------------------------------------------------------------------- -// Transmit the command (to the reader) that was placed in ToSend[]. -//----------------------------------------------------------------------------- -static void TransmitTo15693Reader(const BYTE *cmd, int len, int *samples, int *wait) -{ - int c; - -// FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR); // No requirement to energise my coils - if(*wait < 10) { *wait = 10; } - - c = 0; - for(;;) { - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = cmd[c]; - c++; - if(c >= len) { - break; - } - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - volatile DWORD r = AT91C_BASE_SSC->SSC_RHR; - (void)r; - } - WDT_HIT(); - } - *samples = (c + *wait) << 3; -} - -static int GetIso15693AnswerFromTag(BYTE *receivedResponse, int maxLen, int *samples, int *elapsed) -{ - int c = 0; - BYTE *dest = (BYTE *)BigBuf; - int getNext = 0; - - SBYTE prev = 0; - -// 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)) { - SBYTE b; - b = (SBYTE)AT91C_BASE_SSC->SSC_RHR; - - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates, so every other sample is I, - // every other is Q. We just want power, so abs(I) + abs(Q) is - // close to what we want. - if(getNext) { - SBYTE r; - - if(b < 0) { - r = -b; - } else { - r = b; - } - if(prev < 0) { - r -= prev; - } else { - r += prev; - } - - 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(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0x43; - } - if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { - SBYTE b; - b = (SBYTE)AT91C_BASE_SSC->SSC_RHR; - - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates, so every other sample is I, - // every other is Q. We just want power, so abs(I) + abs(Q) is - // close to what we want. - if(getNext) { - SBYTE r; - - if(b < 0) { - r = -b; - } else { - r = b; - } - if(prev < 0) { - r -= prev; - } else { - r += prev; - } - - 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(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 DWORD 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)) { - SBYTE b; - b = (SBYTE)AT91C_BASE_SSC->SSC_RHR; - - // The samples are correlations against I and Q versions of the - // tone that the tag AM-modulates, so every other sample is I, - // every other is Q. We just want power, so abs(I) + abs(Q) is - // close to what we want. - if(getNext) { - SBYTE r; - - if(b < 0) { - r = -b; - } else { - r = b; - } - if(prev < 0) { - r -= prev; - } else { - r += prev; - } - - 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 +// Modified by piwi, Oct 2018 +// +// 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. +//----------------------------------------------------------------------------- + +// The ISO 15693 describes two transmission modes from reader to tag, and four +// transmission modes from tag to reader. As of Oct 2018 this code supports +// both reader modes and the high speed 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. +// For card simulation, the code supports both high and low speed modes with one subcarrier. +// +// 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 +//----------------------------------------------------------------------------- + + +// Random Remarks: +// *) UID is always used "transmission order" (LSB), which is reverse to display order + +// TODO / BUGS / ISSUES: +// *) signal decoding is unable to detect collisions. +// *) add anti-collision support for inventory-commands +// *) read security status of a block +// *) sniffing and simulation do not support two subcarrier modes. +// *) remove or refactor code under "deprecated" +// *) document all the functions + +#include "iso15693.h" + +#include "proxmark3.h" +#include "util.h" +#include "apps.h" +#include "string.h" +#include "iso15693tools.h" +#include "protocols.h" +#include "usb_cdc.h" +#include "BigBuf.h" +#include "fpgaloader.h" + +#define arraylen(x) (sizeof(x)/sizeof((x)[0])) + +// Delays in SSP_CLK ticks. +// SSP_CLK runs at 13,56MHz / 32 = 423.75kHz when simulating a tag +#define DELAY_READER_TO_ARM 8 +#define DELAY_ARM_TO_READER 0 +//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when acting as reader. All values should be multiples of 16 +#define DELAY_ARM_TO_TAG 16 +#define DELAY_TAG_TO_ARM 32 +//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when snooping. All values should be multiples of 16 +#define DELAY_TAG_TO_ARM_SNOOP 32 +#define DELAY_READER_TO_ARM_SNOOP 32 + +// times in samples @ 212kHz when acting as reader +//#define ISO15693_READER_TIMEOUT 80 // 80/212kHz = 378us, nominal t1_max=313,9us +#define ISO15693_READER_TIMEOUT 330 // 330/212kHz = 1558us, should be even enough for iClass tags responding to ACTALL +#define ISO15693_READER_TIMEOUT_WRITE 4700 // 4700/212kHz = 22ms, nominal 20ms + + +static int DEBUG = 0; + + +/////////////////////////////////////////////////////////////////////// +// ISO 15693 Part 2 - Air Interface +// This section basically contains transmission and receiving of bits +/////////////////////////////////////////////////////////////////////// + +// buffers +#define ISO15693_DMA_BUFFER_SIZE 256 // must be a power of 2 +#define ISO15693_MAX_RESPONSE_LENGTH 36 // allows read single block with the maximum block size of 256bits. Read multiple blocks not supported yet +#define ISO15693_MAX_COMMAND_LENGTH 45 // allows write single block with the maximum block size of 256bits. Write multiple blocks not supported yet + + +// specific LogTrace function for ISO15693: the duration needs to be scaled because otherwise it won't fit into a uint16_t +bool LogTrace_ISO15693(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag) { + uint32_t duration = timestamp_end - timestamp_start; + duration /= 32; + timestamp_end = timestamp_start + duration; + return LogTrace(btBytes, iLen, timestamp_start, timestamp_end, parity, readerToTag); +} + + +// --------------------------- +// 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 +void CodeIso15693AsReader(uint8_t *cmd, int n) { + + ToSendReset(); + + // SOF for 1of4 + ToSend[++ToSendMax] = 0x84; //10000100 + + // data + for (int i = 0; i < n; i++) { + for (int j = 0; j < 8; j += 2) { + int these = (cmd[i] >> j) & 0x03; + switch(these) { + case 0: + ToSend[++ToSendMax] = 0x40; //01000000 + break; + case 1: + ToSend[++ToSendMax] = 0x10; //00010000 + break; + case 2: + ToSend[++ToSendMax] = 0x04; //00000100 + break; + case 3: + ToSend[++ToSendMax] = 0x01; //00000001 + break; + } + } + } + + // EOF + ToSend[++ToSendMax] = 0x20; //0010 + 0000 padding + + ToSendMax++; +} + + +// Encode EOF only +static void CodeIso15693AsReaderEOF() { + ToSendReset(); + ToSend[++ToSendMax] = 0x20; + ToSendMax++; +} + + +// encode data using "1 out of 256" scheme +// 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) +{ + ToSendReset(); + + // SOF for 1of256 + ToSend[++ToSendMax] = 0x81; //10000001 + + // data + for(int i = 0; i < n; i++) { + for (int j = 0; j <= 255; j++) { + if (cmd[i] == j) { + ToSendStuffBit(0); + ToSendStuffBit(1); + } else { + ToSendStuffBit(0); + ToSendStuffBit(0); + } + } + } + + // EOF + ToSend[++ToSendMax] = 0x20; //0010 + 0000 padding + + ToSendMax++; +} + + +// static uint8_t encode4Bits(const uint8_t b) { + // uint8_t c = b & 0xF; + // // OTA, the least significant bits first + // // The columns are + // // 1 - Bit value to send + // // 2 - Reversed (big-endian) + // // 3 - Manchester Encoded + // // 4 - Hex values + + // switch(c){ + // // 1 2 3 4 + // case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55 + // case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95 + // case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65 + // case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5 + // case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59 + // case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99 + // case 9: return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69 + // case 8: return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9 + // case 7: return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56 + // case 6: return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96 + // case 5: return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66 + // case 4: return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6 + // case 3: return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a + // case 2: return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a + // case 1: return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a + // default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa + + // } +// } + +static const uint8_t encode_4bits[16] = { 0xaa, 0x6a, 0x9a, 0x5a, 0xa6, 0x66, 0x96, 0x56, 0xa9, 0x69, 0x99, 0x59, 0xa5, 0x65, 0x95, 0x55 }; + +void CodeIso15693AsTag(uint8_t *cmd, size_t len) { + /* + * SOF comprises 3 parts; + * * An unmodulated time of 56.64 us + * * 24 pulses of 423.75 kHz (fc/32) + * * A logic 1, which starts with an unmodulated time of 18.88us + * followed by 8 pulses of 423.75kHz (fc/32) + * + * EOF comprises 3 parts: + * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated + * time of 18.88us. + * - 24 pulses of fc/32 + * - An unmodulated time of 56.64 us + * + * A logic 0 starts with 8 pulses of fc/32 + * followed by an unmodulated time of 256/fc (~18,88us). + * + * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by + * 8 pulses of fc/32 (also 18.88us) + * + * A bit here becomes 8 pulses of fc/32. Therefore: + * The SOF can be written as 00011101 = 0x1D + * The EOF can be written as 10111000 = 0xb8 + * A logic 1 is 01 + * A logic 0 is 10 + * + * */ + + ToSendReset(); + + // SOF + ToSend[++ToSendMax] = 0x1D; // 00011101 + + // data + for (int i = 0; i < len; i++) { + ToSend[++ToSendMax] = encode_4bits[cmd[i] & 0xF]; + ToSend[++ToSendMax] = encode_4bits[cmd[i] >> 4]; + } + + // EOF + ToSend[++ToSendMax] = 0xB8; // 10111000 + + ToSendMax++; +} + + +// Transmit the command (to the tag) that was placed in cmd[]. +void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t *start_time) { + + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_FULL_MOD); + + if (*start_time < DELAY_ARM_TO_TAG) { + *start_time = DELAY_ARM_TO_TAG; + } + + *start_time = (*start_time - DELAY_ARM_TO_TAG) & 0xfffffff0; + + if (GetCountSspClk() > *start_time) { // we may miss the intended time + *start_time = (GetCountSspClk() + 16) & 0xfffffff0; // next possible time + } + + while (GetCountSspClk() < *start_time) + /* wait */ ; + + LED_B_ON(); + for (int c = 0; c < len; c++) { + uint8_t data = cmd[c]; + for (int i = 0; i < 8; i++) { + uint16_t send_word = (data & 0x80) ? 0xffff : 0x0000; + while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ; + AT91C_BASE_SSC->SSC_THR = send_word; + while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ; + AT91C_BASE_SSC->SSC_THR = send_word; + data <<= 1; + } + WDT_HIT(); + } + LED_B_OFF(); + + *start_time = *start_time + DELAY_ARM_TO_TAG; +} + + +//----------------------------------------------------------------------------- +// Transmit the tag response (to the reader) that was placed in cmd[]. +//----------------------------------------------------------------------------- +void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t *start_time, uint32_t slot_time, bool slow) { + // don't use the FPGA_HF_SIMULATOR_MODULATE_424K_8BIT minor mode. It would spoil GetCountSspClk() + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K); + + uint32_t modulation_start_time = *start_time - DELAY_ARM_TO_READER + 3 * 8; // no need to transfer the unmodulated start of SOF + + while (GetCountSspClk() > (modulation_start_time & 0xfffffff8) + 3) { // we will miss the intended time + if (slot_time) { + modulation_start_time += slot_time; // use next available slot + } else { + modulation_start_time = (modulation_start_time & 0xfffffff8) + 8; // next possible time + } + } + + while (GetCountSspClk() < (modulation_start_time & 0xfffffff8)) + /* wait */ ; + + uint8_t shift_delay = modulation_start_time & 0x00000007; + + *start_time = modulation_start_time + DELAY_ARM_TO_READER - 3 * 8; + + LED_C_ON(); + uint8_t bits_to_shift = 0x00; + uint8_t bits_to_send = 0x00; + for (size_t c = 0; c < len; c++) { + for (int i = (c==0?4:7); i >= 0; i--) { + uint8_t cmd_bits = ((cmd[c] >> i) & 0x01) ? 0xff : 0x00; + for (int j = 0; j < (slow?4:1); ) { + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { + bits_to_send = bits_to_shift << (8 - shift_delay) | cmd_bits >> shift_delay; + AT91C_BASE_SSC->SSC_THR = bits_to_send; + bits_to_shift = cmd_bits; + j++; + } + } + } + WDT_HIT(); + } + // send the remaining bits, padded with 0: + bits_to_send = bits_to_shift << (8 - shift_delay); + for ( ; ; ) { + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { + AT91C_BASE_SSC->SSC_THR = bits_to_send; + break; + } + } + LED_C_OFF(); +} + + +//============================================================================= +// An ISO 15693 decoder for tag responses (one subcarrier only). +// Uses cross correlation to identify each bit and EOF. +// This function is called 8 times per bit (every 2 subcarrier cycles). +// Subcarrier frequency fs is 424kHz, 1/fs = 2,36us, +// i.e. function is called every 4,72us +// LED handling: +// LED C -> ON once we have received the SOF and are expecting the rest. +// LED C -> OFF once we have received EOF or are unsynced +// +// Returns: true if we received a EOF +// false if we are still waiting for some more +//============================================================================= + +#define NOISE_THRESHOLD 160 // don't try to correlate noise +#define MAX_PREVIOUS_AMPLITUDE (-1 - NOISE_THRESHOLD) + +typedef struct DecodeTag { + enum { + STATE_TAG_SOF_LOW, + STATE_TAG_SOF_RISING_EDGE, + STATE_TAG_SOF_HIGH, + STATE_TAG_SOF_HIGH_END, + STATE_TAG_RECEIVING_DATA, + STATE_TAG_EOF, + STATE_TAG_EOF_TAIL + } state; + int bitCount; + int posCount; + enum { + LOGIC0, + LOGIC1, + SOF_PART1, + SOF_PART2 + } lastBit; + uint16_t shiftReg; + uint16_t max_len; + uint8_t *output; + int len; + int sum1, sum2; + int threshold_sof; + int threshold_half; + uint16_t previous_amplitude; +} DecodeTag_t; + + +static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag) { + switch (DecodeTag->state) { + case STATE_TAG_SOF_LOW: + // waiting for a rising edge + if (amplitude > NOISE_THRESHOLD + DecodeTag->previous_amplitude) { + if (DecodeTag->posCount > 10) { + DecodeTag->threshold_sof = amplitude - DecodeTag->previous_amplitude; // to be divided by 2 + DecodeTag->threshold_half = 0; + DecodeTag->state = STATE_TAG_SOF_RISING_EDGE; + } else { + DecodeTag->posCount = 0; + } + } else { + DecodeTag->posCount++; + DecodeTag->previous_amplitude = amplitude; + } + break; + + case STATE_TAG_SOF_RISING_EDGE: + if (amplitude > DecodeTag->threshold_sof + DecodeTag->previous_amplitude) { // edge still rising + if (amplitude > DecodeTag->threshold_sof + DecodeTag->threshold_sof) { // steeper edge, take this as time reference + DecodeTag->posCount = 1; + } else { + DecodeTag->posCount = 2; + } + DecodeTag->threshold_sof = (amplitude - DecodeTag->previous_amplitude) / 2; + } else { + DecodeTag->posCount = 2; + DecodeTag->threshold_sof = DecodeTag->threshold_sof/2; + } + // DecodeTag->posCount = 2; + DecodeTag->state = STATE_TAG_SOF_HIGH; + break; + + case STATE_TAG_SOF_HIGH: + // waiting for 10 times high. Take average over the last 8 + if (amplitude > DecodeTag->threshold_sof) { + DecodeTag->posCount++; + if (DecodeTag->posCount > 2) { + DecodeTag->threshold_half += amplitude; // keep track of average high value + } + if (DecodeTag->posCount == 10) { + DecodeTag->threshold_half >>= 2; // (4 times 1/2 average) + DecodeTag->state = STATE_TAG_SOF_HIGH_END; + } + } else { // high phase was too short + DecodeTag->posCount = 1; + DecodeTag->previous_amplitude = amplitude; + DecodeTag->state = STATE_TAG_SOF_LOW; + } + break; + + case STATE_TAG_SOF_HIGH_END: + // check for falling edge + if (DecodeTag->posCount == 13 && amplitude < DecodeTag->threshold_sof) { + DecodeTag->lastBit = SOF_PART1; // detected 1st part of SOF (12 samples low and 12 samples high) + DecodeTag->shiftReg = 0; + DecodeTag->bitCount = 0; + DecodeTag->len = 0; + DecodeTag->sum1 = amplitude; + DecodeTag->sum2 = 0; + DecodeTag->posCount = 2; + DecodeTag->state = STATE_TAG_RECEIVING_DATA; + // FpgaDisableTracing(); // DEBUGGING + // Dbprintf("amplitude = %d, threshold_sof = %d, threshold_half/4 = %d, previous_amplitude = %d", + // amplitude, + // DecodeTag->threshold_sof, + // DecodeTag->threshold_half/4, + // DecodeTag->previous_amplitude); // DEBUGGING + LED_C_ON(); + } else { + DecodeTag->posCount++; + if (DecodeTag->posCount > 13) { // high phase too long + DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } + } + break; + + case STATE_TAG_RECEIVING_DATA: + // FpgaDisableTracing(); // DEBUGGING + // Dbprintf("amplitude = %d, threshold_sof = %d, threshold_half/4 = %d, previous_amplitude = %d", + // amplitude, + // DecodeTag->threshold_sof, + // DecodeTag->threshold_half/4, + // DecodeTag->previous_amplitude); // DEBUGGING + if (DecodeTag->posCount == 1) { + DecodeTag->sum1 = 0; + DecodeTag->sum2 = 0; + } + if (DecodeTag->posCount <= 4) { + DecodeTag->sum1 += amplitude; + } else { + DecodeTag->sum2 += amplitude; + } + if (DecodeTag->posCount == 8) { + if (DecodeTag->sum1 > DecodeTag->threshold_half && DecodeTag->sum2 > DecodeTag->threshold_half) { // modulation in both halves + if (DecodeTag->lastBit == LOGIC0) { // this was already part of EOF + DecodeTag->state = STATE_TAG_EOF; + } else { + DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } + } else if (DecodeTag->sum1 < DecodeTag->threshold_half && DecodeTag->sum2 > DecodeTag->threshold_half) { // modulation in second half + // logic 1 + if (DecodeTag->lastBit == SOF_PART1) { // still part of SOF + DecodeTag->lastBit = SOF_PART2; // SOF completed + } else { + DecodeTag->lastBit = LOGIC1; + DecodeTag->shiftReg >>= 1; + DecodeTag->shiftReg |= 0x80; + DecodeTag->bitCount++; + if (DecodeTag->bitCount == 8) { + DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; + DecodeTag->len++; + // if (DecodeTag->shiftReg == 0x12 && DecodeTag->len == 1) FpgaDisableTracing(); // DEBUGGING + if (DecodeTag->len > DecodeTag->max_len) { + // buffer overflow, give up + LED_C_OFF(); + return true; + } + DecodeTag->bitCount = 0; + DecodeTag->shiftReg = 0; + } + } + } else if (DecodeTag->sum1 > DecodeTag->threshold_half && DecodeTag->sum2 < DecodeTag->threshold_half) { // modulation in first half + // logic 0 + if (DecodeTag->lastBit == SOF_PART1) { // incomplete SOF + DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } else { + DecodeTag->lastBit = LOGIC0; + DecodeTag->shiftReg >>= 1; + DecodeTag->bitCount++; + if (DecodeTag->bitCount == 8) { + DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg; + DecodeTag->len++; + // if (DecodeTag->shiftReg == 0x12 && DecodeTag->len == 1) FpgaDisableTracing(); // DEBUGGING + if (DecodeTag->len > DecodeTag->max_len) { + // buffer overflow, give up + DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } + DecodeTag->bitCount = 0; + DecodeTag->shiftReg = 0; + } + } + } else { // no modulation + if (DecodeTag->lastBit == SOF_PART2) { // only SOF (this is OK for iClass) + LED_C_OFF(); + return true; + } else { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } + } + DecodeTag->posCount = 0; + } + DecodeTag->posCount++; + break; + + case STATE_TAG_EOF: + if (DecodeTag->posCount == 1) { + DecodeTag->sum1 = 0; + DecodeTag->sum2 = 0; + } + if (DecodeTag->posCount <= 4) { + DecodeTag->sum1 += amplitude; + } else { + DecodeTag->sum2 += amplitude; + } + if (DecodeTag->posCount == 8) { + if (DecodeTag->sum1 > DecodeTag->threshold_half && DecodeTag->sum2 < DecodeTag->threshold_half) { // modulation in first half + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_EOF_TAIL; + } else { + DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } + } + DecodeTag->posCount++; + break; + + case STATE_TAG_EOF_TAIL: + if (DecodeTag->posCount == 1) { + DecodeTag->sum1 = 0; + DecodeTag->sum2 = 0; + } + if (DecodeTag->posCount <= 4) { + DecodeTag->sum1 += amplitude; + } else { + DecodeTag->sum2 += amplitude; + } + if (DecodeTag->posCount == 8) { + if (DecodeTag->sum1 < DecodeTag->threshold_half && DecodeTag->sum2 < DecodeTag->threshold_half) { // no modulation in both halves + LED_C_OFF(); + return true; + } else { + DecodeTag->posCount = 0; + DecodeTag->previous_amplitude = amplitude; + DecodeTag->state = STATE_TAG_SOF_LOW; + LED_C_OFF(); + } + } + DecodeTag->posCount++; + break; + } + + return false; +} + + +static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_len) { + DecodeTag->previous_amplitude = MAX_PREVIOUS_AMPLITUDE; + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + DecodeTag->output = data; + DecodeTag->max_len = max_len; +} + + +static void DecodeTagReset(DecodeTag_t *DecodeTag) { + DecodeTag->posCount = 0; + DecodeTag->state = STATE_TAG_SOF_LOW; + DecodeTag->previous_amplitude = MAX_PREVIOUS_AMPLITUDE; +} + + +/* + * Receive and decode the tag response, also log to tracebuffer + */ +int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, uint16_t timeout, uint32_t *eof_time) { + + int samples = 0; + int ret = 0; + + uint16_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; + + // the Decoder data structure + DecodeTag_t DecodeTag = { 0 }; + DecodeTagInit(&DecodeTag, response, max_len); + + // wait for last transfer to complete + while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); + + // And put the FPGA in the appropriate mode + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_SUBCARRIER_424_KHZ | FPGA_HF_READER_MODE_RECEIVE_AMPLITUDE); + + // Setup and start DMA. + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + uint32_t dma_start_time = 0; + uint16_t *upTo = dmaBuf; + + for(;;) { + uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); + + if (behindBy == 0) continue; + + samples++; + if (samples == 1) { + // DMA has transferred the very first data + dma_start_time = GetCountSspClk() & 0xfffffff0; + } + + uint16_t tagdata = *upTo++; + + if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning + if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); + ret = -1; + break; + } + } + if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and + AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers + } + + if (Handle15693SamplesFromTag(tagdata, &DecodeTag)) { + *eof_time = dma_start_time + samples*16 - DELAY_TAG_TO_ARM; // end of EOF + if (DecodeTag.lastBit == SOF_PART2) { + *eof_time -= 8*16; // needed 8 additional samples to confirm single SOF (iCLASS) + } + if (DecodeTag.len > DecodeTag.max_len) { + ret = -2; // buffer overflow + } + break; + } + + if (samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) { + ret = -1; // timeout + break; + } + + } + + FpgaDisableSscDma(); + + if (DEBUG) Dbprintf("samples = %d, ret = %d, Decoder: state = %d, lastBit = %d, len = %d, bitCount = %d, posCount = %d", + samples, ret, DecodeTag.state, DecodeTag.lastBit, DecodeTag.len, DecodeTag.bitCount, DecodeTag.posCount); + + if (ret < 0) { + return ret; + } + + uint32_t sof_time = *eof_time + - DecodeTag.len * 8 * 8 * 16 // time for byte transfers + - 32 * 16 // time for SOF transfer + - (DecodeTag.lastBit != SOF_PART2?32*16:0); // time for EOF transfer + + if (DEBUG) Dbprintf("timing: sof_time = %d, eof_time = %d", sof_time, *eof_time); + + LogTrace_ISO15693(DecodeTag.output, DecodeTag.len, sof_time*4, *eof_time*4, NULL, false); + + return DecodeTag.len; +} + + +//============================================================================= +// An ISO15693 decoder for reader commands. +// +// This function is called 4 times per bit (every 2 subcarrier cycles). +// Subcarrier frequency fs is 848kHz, 1/fs = 1,18us, i.e. function is called every 2,36us +// LED handling: +// LED B -> ON once we have received the SOF and are expecting the rest. +// LED B -> OFF once we have received EOF or are in error state or unsynced +// +// Returns: true if we received a EOF +// false if we are still waiting for some more +//============================================================================= + +typedef struct DecodeReader { + enum { + STATE_READER_UNSYNCD, + STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF, + STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF, + STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF, + STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF, + STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4, + STATE_READER_RECEIVE_DATA_1_OUT_OF_4, + STATE_READER_RECEIVE_DATA_1_OUT_OF_256, + STATE_READER_RECEIVE_JAMMING + } state; + enum { + CODING_1_OUT_OF_4, + CODING_1_OUT_OF_256 + } Coding; + uint8_t shiftReg; + uint8_t bitCount; + int byteCount; + int byteCountMax; + int posCount; + int sum1, sum2; + uint8_t *output; + uint8_t jam_search_len; + uint8_t *jam_search_string; +} DecodeReader_t; + + +static void DecodeReaderInit(DecodeReader_t* DecodeReader, uint8_t *data, uint16_t max_len, uint8_t jam_search_len, uint8_t *jam_search_string) { + DecodeReader->output = data; + DecodeReader->byteCountMax = max_len; + DecodeReader->state = STATE_READER_UNSYNCD; + DecodeReader->byteCount = 0; + DecodeReader->bitCount = 0; + DecodeReader->posCount = 1; + DecodeReader->shiftReg = 0; + DecodeReader->jam_search_len = jam_search_len; + DecodeReader->jam_search_string = jam_search_string; +} + + +static void DecodeReaderReset(DecodeReader_t* DecodeReader) { + DecodeReader->state = STATE_READER_UNSYNCD; +} + + +static int inline __attribute__((always_inline)) Handle15693SampleFromReader(bool bit, DecodeReader_t *DecodeReader) { + switch (DecodeReader->state) { + case STATE_READER_UNSYNCD: + // wait for unmodulated carrier + if (bit) { + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; + } + break; + + case STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF: + if (!bit) { + // we went low, so this could be the beginning of a SOF + DecodeReader->posCount = 1; + DecodeReader->state = STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF; + } + break; + + case STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF: + DecodeReader->posCount++; + if (bit) { // detected rising edge + if (DecodeReader->posCount < 4) { // rising edge too early (nominally expected at 5) + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; + } else { // SOF + DecodeReader->state = STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF; + } + } else { + if (DecodeReader->posCount > 5) { // stayed low for too long + DecodeReaderReset(DecodeReader); + } else { + // do nothing, keep waiting + } + } + break; + + case STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF: + DecodeReader->posCount++; + if (!bit) { // detected a falling edge + if (DecodeReader->posCount < 20) { // falling edge too early (nominally expected at 21 earliest) + DecodeReaderReset(DecodeReader); + } else if (DecodeReader->posCount < 23) { // SOF for 1 out of 4 coding + DecodeReader->Coding = CODING_1_OUT_OF_4; + DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; + } else if (DecodeReader->posCount < 28) { // falling edge too early (nominally expected at 29 latest) + DecodeReaderReset(DecodeReader); + } else { // SOF for 1 out of 256 coding + DecodeReader->Coding = CODING_1_OUT_OF_256; + DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF; + } + } else { + if (DecodeReader->posCount > 29) { // stayed high for too long + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; + } else { + // do nothing, keep waiting + } + } + break; + + case STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF: + DecodeReader->posCount++; + if (bit) { // detected rising edge + if (DecodeReader->Coding == CODING_1_OUT_OF_256) { + if (DecodeReader->posCount < 32) { // rising edge too early (nominally expected at 33) + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; + } else { + DecodeReader->posCount = 1; + DecodeReader->bitCount = 0; + DecodeReader->byteCount = 0; + DecodeReader->sum1 = 1; + DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_256; + LED_B_ON(); + } + } else { // CODING_1_OUT_OF_4 + if (DecodeReader->posCount < 24) { // rising edge too early (nominally expected at 25) + DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF; + } else { + DecodeReader->posCount = 1; + DecodeReader->state = STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4; + } + } + } else { + if (DecodeReader->Coding == CODING_1_OUT_OF_256) { + if (DecodeReader->posCount > 34) { // signal stayed low for too long + DecodeReaderReset(DecodeReader); + } else { + // do nothing, keep waiting + } + } else { // CODING_1_OUT_OF_4 + if (DecodeReader->posCount > 26) { // signal stayed low for too long + DecodeReaderReset(DecodeReader); + } else { + // do nothing, keep waiting + } + } + } + break; + + case STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4: + DecodeReader->posCount++; + if (bit) { + if (DecodeReader->posCount == 9) { + DecodeReader->posCount = 1; + DecodeReader->bitCount = 0; + DecodeReader->byteCount = 0; + DecodeReader->sum1 = 1; + DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_4; + LED_B_ON(); + } else { + // do nothing, keep waiting + } + } else { // unexpected falling edge + DecodeReaderReset(DecodeReader); + } + break; + + case STATE_READER_RECEIVE_DATA_1_OUT_OF_4: + DecodeReader->posCount++; + if (DecodeReader->posCount == 1) { + DecodeReader->sum1 = bit?1:0; + } else if (DecodeReader->posCount <= 4) { + if (bit) DecodeReader->sum1++; + } else if (DecodeReader->posCount == 5) { + DecodeReader->sum2 = bit?1:0; + } else { + if (bit) DecodeReader->sum2++; + } + if (DecodeReader->posCount == 8) { + DecodeReader->posCount = 0; + if (DecodeReader->sum1 <= 1 && DecodeReader->sum2 >= 3) { // EOF + LED_B_OFF(); // Finished receiving + DecodeReaderReset(DecodeReader); + if (DecodeReader->byteCount != 0) { + return true; + } + } else if (DecodeReader->sum1 >= 3 && DecodeReader->sum2 <= 1) { // detected a 2bit position + DecodeReader->shiftReg >>= 2; + DecodeReader->shiftReg |= (DecodeReader->bitCount << 6); + } + if (DecodeReader->bitCount == 15) { // we have a full byte + DecodeReader->output[DecodeReader->byteCount++] = DecodeReader->shiftReg; + if (DecodeReader->byteCount > DecodeReader->byteCountMax) { + // buffer overflow, give up + LED_B_OFF(); + DecodeReaderReset(DecodeReader); + } + DecodeReader->bitCount = 0; + DecodeReader->shiftReg = 0; + if (DecodeReader->byteCount == DecodeReader->jam_search_len) { + if (!memcmp(DecodeReader->output, DecodeReader->jam_search_string, DecodeReader->jam_search_len)) { + LED_D_ON(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_JAM); + DecodeReader->state = STATE_READER_RECEIVE_JAMMING; + } + } + } else { + DecodeReader->bitCount++; + } + } + break; + + case STATE_READER_RECEIVE_DATA_1_OUT_OF_256: + DecodeReader->posCount++; + if (DecodeReader->posCount == 1) { + DecodeReader->sum1 = bit?1:0; + } else if (DecodeReader->posCount <= 4) { + if (bit) DecodeReader->sum1++; + } else if (DecodeReader->posCount == 5) { + DecodeReader->sum2 = bit?1:0; + } else if (bit) { + DecodeReader->sum2++; + } + if (DecodeReader->posCount == 8) { + DecodeReader->posCount = 0; + if (DecodeReader->sum1 <= 1 && DecodeReader->sum2 >= 3) { // EOF + LED_B_OFF(); // Finished receiving + DecodeReaderReset(DecodeReader); + if (DecodeReader->byteCount != 0) { + return true; + } + } else if (DecodeReader->sum1 >= 3 && DecodeReader->sum2 <= 1) { // detected the bit position + DecodeReader->shiftReg = DecodeReader->bitCount; + } + if (DecodeReader->bitCount == 255) { // we have a full byte + DecodeReader->output[DecodeReader->byteCount++] = DecodeReader->shiftReg; + if (DecodeReader->byteCount > DecodeReader->byteCountMax) { + // buffer overflow, give up + LED_B_OFF(); + DecodeReaderReset(DecodeReader); + } + if (DecodeReader->byteCount == DecodeReader->jam_search_len) { + if (!memcmp(DecodeReader->output, DecodeReader->jam_search_string, DecodeReader->jam_search_len)) { + LED_D_ON(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_JAM); + DecodeReader->state = STATE_READER_RECEIVE_JAMMING; + } + } + } + DecodeReader->bitCount++; + } + break; + + case STATE_READER_RECEIVE_JAMMING: + DecodeReader->posCount++; + if (DecodeReader->Coding == CODING_1_OUT_OF_4) { + if (DecodeReader->posCount == 7*16) { // 7 bits jammed + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE); // stop jamming + // FpgaDisableTracing(); + LED_D_OFF(); + } else if (DecodeReader->posCount == 8*16) { + DecodeReader->posCount = 0; + DecodeReader->output[DecodeReader->byteCount++] = 0x00; + DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_4; + } + } else { + if (DecodeReader->posCount == 7*256) { // 7 bits jammend + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE); // stop jamming + LED_D_OFF(); + } else if (DecodeReader->posCount == 8*256) { + DecodeReader->posCount = 0; + DecodeReader->output[DecodeReader->byteCount++] = 0x00; + DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_256; + } + } + break; + + default: + LED_B_OFF(); + DecodeReaderReset(DecodeReader); + break; + } + + return false; +} + + +//----------------------------------------------------------------------------- +// Receive a command (from the reader to us, where we are the simulated tag), +// and store it in the given buffer, up to the given maximum length. Keeps +// spinning, waiting for a well-framed command, until either we get one +// (returns len) or someone presses the pushbutton on the board (returns -1). +// +// Assume that we're called with the SSC (to the FPGA) and ADC path set +// correctly. +//----------------------------------------------------------------------------- + +int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time) { + int samples = 0; + bool gotFrame = false; + uint8_t b; + + uint8_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; + + // the decoder data structure + DecodeReader_t DecodeReader = {0}; + DecodeReaderInit(&DecodeReader, received, max_len, 0, NULL); + + // wait for last transfer to complete + while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)); + + LED_D_OFF(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); + + // clear receive register and wait for next transfer + uint32_t temp = AT91C_BASE_SSC->SSC_RHR; + (void) temp; + while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) ; + + uint32_t dma_start_time = GetCountSspClk() & 0xfffffff8; + + // Setup and start DMA. + FpgaSetupSscDma(dmaBuf, ISO15693_DMA_BUFFER_SIZE); + uint8_t *upTo = dmaBuf; + + for (;;) { + uint16_t behindBy = ((uint8_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); + + if (behindBy == 0) continue; + + b = *upTo++; + if (upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning + if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); + break; + } + } + if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and + AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers + } + + for (int i = 7; i >= 0; i--) { + if (Handle15693SampleFromReader((b >> i) & 0x01, &DecodeReader)) { + *eof_time = dma_start_time + samples - DELAY_READER_TO_ARM; // end of EOF + gotFrame = true; + break; + } + samples++; + } + + if (gotFrame) { + break; + } + + if (BUTTON_PRESS()) { + DecodeReader.byteCount = -1; + break; + } + + WDT_HIT(); + } + + FpgaDisableSscDma(); + + if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d", + samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount); + + if (DecodeReader.byteCount > 0) { + uint32_t sof_time = *eof_time + - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128:2048) // time for byte transfers + - 32 // time for SOF transfer + - 16; // time for EOF transfer + LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*32, *eof_time*32, NULL, true); + } + + return DecodeReader.byteCount; +} + + +// Construct an identify (Inventory) request, which is the first +// thing that you must send to a tag to get a response. +static void BuildIdentifyRequest(uint8_t *cmd) { + uint16_t crc; + // one sub-carrier, inventory, 1 slot, fast rate + cmd[0] = ISO15693_REQ_INVENTORY | ISO15693_REQINV_SLOT1 | ISO15693_REQ_DATARATE_HIGH; + // inventory command code + cmd[1] = 0x01; + // no mask + cmd[2] = 0x00; + //Now the CRC + crc = Iso15693Crc(cmd, 3); + cmd[3] = crc & 0xff; + cmd[4] = crc >> 8; +} + + +//----------------------------------------------------------------------------- +// 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) { + LED_A_ON(); + + uint8_t *dest = BigBuf_get_addr(); + + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); + LED_D_ON(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + + uint8_t cmd[5]; + BuildIdentifyRequest(cmd); + CodeIso15693AsReader(cmd, sizeof(cmd)); + + // Give the tags time to energize + SpinDelay(100); + + // Now send the command + uint32_t start_time = 0; + TransmitTo15693Tag(ToSend, ToSendMax, &start_time); + + // wait for last transfer to complete + while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)) ; + + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_SUBCARRIER_424_KHZ | FPGA_HF_READER_MODE_RECEIVE_AMPLITUDE); + + for(int c = 0; c < 4000; ) { + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) { + uint16_t r = AT91C_BASE_SSC->SSC_RHR; + dest[c++] = r >> 5; + } + } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); +} + + +void SnoopIso15693(uint8_t jam_search_len, uint8_t *jam_search_string) { + + LED_A_ON(); + + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + + clear_trace(); + set_tracing(true); + + // The DMA buffer, used to stream samples from the FPGA + uint16_t dmaBuf[ISO15693_DMA_BUFFER_SIZE]; + + // Count of samples received so far, so that we can include timing + // information in the trace buffer. + int samples = 0; + + DecodeTag_t DecodeTag = {0}; + uint8_t response[ISO15693_MAX_RESPONSE_LENGTH]; + DecodeTagInit(&DecodeTag, response, sizeof(response)); + + DecodeReader_t DecodeReader = {0}; + uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; + DecodeReaderInit(&DecodeReader, cmd, sizeof(cmd), jam_search_len, jam_search_string); + + // Print some debug information about the buffer sizes + if (DEBUG) { + Dbprintf("Snooping buffers initialized:"); + Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen()); + Dbprintf(" Reader -> tag: %i bytes", ISO15693_MAX_COMMAND_LENGTH); + Dbprintf(" tag -> Reader: %i bytes", ISO15693_MAX_RESPONSE_LENGTH); + Dbprintf(" DMA: %i bytes", ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t)); + } + Dbprintf("Snoop started. Press PM3 Button to stop."); + + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE); + LED_D_OFF(); + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + StartCountSspClk(); + FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + + bool TagIsActive = false; + bool ReaderIsActive = false; + bool ExpectTagAnswer = false; + uint32_t dma_start_time = 0; + uint16_t *upTo = dmaBuf; + + uint16_t max_behindBy = 0; + + // And now we loop, receiving samples. + for(;;) { + uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1); + if (behindBy > max_behindBy) { + max_behindBy = behindBy; + } + + if (behindBy == 0) continue; + + samples++; + if (samples == 1) { + // DMA has transferred the very first data + dma_start_time = GetCountSspClk() & 0xfffffff0; + } + + uint16_t snoopdata = *upTo++; + + if (upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning + if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) { + // FpgaDisableTracing(); + Dbprintf("About to blow circular buffer - aborted! behindBy=%d, samples=%d", behindBy, samples); + break; + } + if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated. + AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and + AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers + WDT_HIT(); + if (BUTTON_PRESS()) { + DbpString("Snoop stopped."); + break; + } + } + } + + if (!TagIsActive) { // no need to try decoding reader data if the tag is sending + if (Handle15693SampleFromReader(snoopdata & 0x02, &DecodeReader)) { + // FpgaDisableSscDma(); + uint32_t eof_time = dma_start_time + samples*16 + 8 - DELAY_READER_TO_ARM_SNOOP; // end of EOF + if (DecodeReader.byteCount > 0) { + uint32_t sof_time = eof_time + - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128*16:2048*16) // time for byte transfers + - 32*16 // time for SOF transfer + - 16*16; // time for EOF transfer + LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*4, eof_time*4, NULL, true); + } + /* And ready to receive another command. */ + DecodeReaderReset(&DecodeReader); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DecodeTagReset(&DecodeTag); + ReaderIsActive = false; + ExpectTagAnswer = true; + // upTo = dmaBuf; + // samples = 0; + // FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + // continue; + } else if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) { + // FpgaDisableSscDma(); + uint32_t eof_time = dma_start_time + samples*16 + 16 - DELAY_READER_TO_ARM_SNOOP; // end of EOF + if (DecodeReader.byteCount > 0) { + uint32_t sof_time = eof_time + - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128*16:2048*16) // time for byte transfers + - 32*16 // time for SOF transfer + - 16*16; // time for EOF transfer + LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*4, eof_time*4, NULL, true); + } + /* And ready to receive another command. */ + DecodeReaderReset(&DecodeReader); + /* And also reset the demod code, which might have been */ + /* false-triggered by the commands from the reader. */ + DecodeTagReset(&DecodeTag); + ReaderIsActive = false; + ExpectTagAnswer = true; + // upTo = dmaBuf; + // samples = 0; + // FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + // continue; + } else { + ReaderIsActive = (DecodeReader.state >= STATE_READER_RECEIVE_DATA_1_OUT_OF_4); + } + } + + if (!ReaderIsActive && ExpectTagAnswer) { // no need to try decoding tag data if the reader is currently sending or no answer expected yet + if (Handle15693SamplesFromTag(snoopdata >> 2, &DecodeTag)) { + // FpgaDisableSscDma(); + uint32_t eof_time = dma_start_time + samples*16 - DELAY_TAG_TO_ARM_SNOOP; // end of EOF + if (DecodeTag.lastBit == SOF_PART2) { + eof_time -= 8*16; // needed 8 additional samples to confirm single SOF (iCLASS) + } + uint32_t sof_time = eof_time + - DecodeTag.len * 8 * 8 * 16 // time for byte transfers + - 32 * 16 // time for SOF transfer + - (DecodeTag.lastBit != SOF_PART2?32*16:0); // time for EOF transfer + LogTrace_ISO15693(DecodeTag.output, DecodeTag.len, sof_time*4, eof_time*4, NULL, false); + // And ready to receive another response. + DecodeTagReset(&DecodeTag); + DecodeReaderReset(&DecodeReader); + ExpectTagAnswer = false; + TagIsActive = false; + // upTo = dmaBuf; + // samples = 0; + // FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE); + // continue; + } else { + TagIsActive = (DecodeTag.state >= STATE_TAG_RECEIVING_DATA); + } + } + + } + + FpgaDisableSscDma(); + + DbpString("Snoop statistics:"); + Dbprintf(" ExpectTagAnswer: %d, TagIsActive: %d, ReaderIsActive: %d", ExpectTagAnswer, TagIsActive, ReaderIsActive); + Dbprintf(" DecodeTag State: %d", DecodeTag.state); + Dbprintf(" DecodeTag byteCnt: %d", DecodeTag.len); + Dbprintf(" DecodeTag posCount: %d", DecodeTag.posCount); + Dbprintf(" DecodeReader State: %d", DecodeReader.state); + Dbprintf(" DecodeReader byteCnt: %d", DecodeReader.byteCount); + Dbprintf(" DecodeReader posCount: %d", DecodeReader.posCount); + Dbprintf(" Trace length: %d", BigBuf_get_traceLen()); + Dbprintf(" Max behindBy: %d", max_behindBy); +} + + +// Initialize the proxmark as iso15k reader +void Iso15693InitReader(void) { + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + + // switch field off and wait until tag resets + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + SpinDelay(10); + + // switch field on + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER); + LED_D_ON(); + + // initialize SSC and select proper AD input + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + + // give tags some time to energize + SpinDelay(250); +} + +/////////////////////////////////////////////////////////////////////// +// ISO 15693 Part 3 - Air Interface +// This section basically contains transmission and receiving of bits +/////////////////////////////////////////////////////////////////////// + + +// uid is in transmission order (which is reverse of display order) +static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber, uint8_t *cmd) { + uint16_t crc; + // If we set the Option_Flag in this request, the VICC will respond with the security status of the block + // followed by the block data + cmd[0] = ISO15693_REQ_OPTION | ISO15693_REQ_ADDRESS | ISO15693_REQ_DATARATE_HIGH; + // READ BLOCK command code + cmd[1] = ISO15693_READBLOCK; + // 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; + //Now the CRC + crc = Iso15693Crc(cmd, 11); // the crc needs to be calculated over 11 bytes + cmd[11] = crc & 0xff; + cmd[12] = crc >> 8; + +} + + +// Now the VICC>VCD responses when we are simulating a tag +static void BuildInventoryResponse(uint8_t *uid) { + uint8_t cmd[12]; + + uint16_t crc; + + cmd[0] = 0; // No error, no protocol format extension + 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 = Iso15693Crc(cmd, 10); + cmd[10] = crc & 0xff; + cmd[11] = crc >> 8; + + CodeIso15693AsTag(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 contain the tag's answer +// return: length of received data, or -1 for timeout +int SendDataTag(uint8_t *send, int sendlen, bool init, bool speed_fast, uint8_t *recv, uint16_t max_recv_len, uint32_t start_time, uint16_t timeout, uint32_t *eof_time) { + + if (init) { + Iso15693InitReader(); + StartCountSspClk(); + } + + int answerLen = 0; + + if (speed_fast) { + // high speed (1 out of 4) + CodeIso15693AsReader(send, sendlen); + } else { + // low speed (1 out of 256) + CodeIso15693AsReader256(send, sendlen); + } + + TransmitTo15693Tag(ToSend, ToSendMax, &start_time); + uint32_t end_time = start_time + 32*(8*ToSendMax-4); // substract the 4 padding bits after EOF + LogTrace_ISO15693(send, sendlen, start_time*4, end_time*4, NULL, true); + + // Now wait for a response + if (recv != NULL) { + answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, timeout, eof_time); + } + + return answerLen; +} + + +int SendDataTagEOF(uint8_t *recv, uint16_t max_recv_len, uint32_t start_time, uint16_t timeout, uint32_t *eof_time) { + + int answerLen = 0; + + CodeIso15693AsReaderEOF(); + + TransmitTo15693Tag(ToSend, ToSendMax, &start_time); + uint32_t end_time = start_time + 32*(8*ToSendMax-4); // substract the 4 padding bits after EOF + LogTrace_ISO15693(NULL, 0, start_time*4, end_time*4, NULL, true); + + // Now wait for a response + if (recv != NULL) { + answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, timeout, eof_time); + } + + 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] & ISO15693_RES_EXT) + strncat(status,"ProtExt ", DBD15STATLEN); + if (d[0] & ISO15693_RES_ERROR) { + // 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:doesn'tExist", 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=Iso15693Crc(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(); + + Iso15693InitReader(); + + StartCountSspClk(); + set_tracing(true); + + uint8_t TagUID[8] = {0x00}; + uint8_t answer[ISO15693_MAX_RESPONSE_LENGTH]; + + // 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 + uint8_t cmd[5]; + BuildIdentifyRequest(cmd); + uint32_t start_time = 0; + uint32_t eof_time; + int answerLen = SendDataTag(cmd, sizeof(cmd), true, true, answer, sizeof(answer), start_time, ISO15693_READER_TIMEOUT, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; + + if (answerLen >= 12) { // we should do a better check than this + TagUID[0] = answer[2]; + TagUID[1] = answer[3]; + TagUID[2] = answer[4]; + TagUID[3] = answer[5]; + TagUID[4] = answer[6]; + TagUID[5] = answer[7]; + TagUID[6] = answer[8]; // IC Manufacturer code + TagUID[7] = answer[9]; // always E0 + } + + Dbprintf("%d octets read from IDENTIFY request:", answerLen); + DbdecodeIso15693Answer(answerLen, answer); + Dbhexdump(answerLen, answer, false); + + // UID is reverse + if (answerLen >= 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]); + + // read all pages + if (answerLen >= 12 && DEBUG) { + for (int i = 0; i < 32; i++) { // sanity check, assume max 32 pages + uint8_t cmd[13]; + BuildReadBlockRequest(TagUID, i, cmd); + answerLen = SendDataTag(cmd, sizeof(cmd), false, true, answer, sizeof(answer), start_time, ISO15693_READER_TIMEOUT, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; + if (answerLen > 0) { + Dbprintf("READ SINGLE BLOCK %d returned %d octets:", i, answerLen); + DbdecodeIso15693Answer(answerLen, answer); + Dbhexdump(answerLen, answer, false); + if ( *((uint32_t*) answer) == 0x07160101 ) break; // exit on NoPageErr + } + } + } + + // for the time being, switch field off to protect RDV4 + // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + + LED_A_OFF(); +} + + +// Initialize the proxmark as iso15k tag +void Iso15693InitTag(void) { + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); + LED_D_OFF(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR); + StartCountSspClk(); +} + + +// Simulate an ISO15693 TAG. +// For Inventory command: print command and send Inventory Response with given UID +// TODO: interpret other reader commands and send appropriate response +void SimTagIso15693(uint32_t parameter, uint8_t *uid) { + + LED_A_ON(); + + Iso15693InitTag(); + + // Build a suitable response to the reader INVENTORY command + BuildInventoryResponse(uid); + + // Listen to reader + while (!BUTTON_PRESS()) { + uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH]; + uint32_t eof_time = 0, start_time = 0; + int cmd_len = GetIso15693CommandFromReader(cmd, sizeof(cmd), &eof_time); + + if ((cmd_len >= 5) && (cmd[0] & ISO15693_REQ_INVENTORY) && (cmd[1] == ISO15693_INVENTORY)) { // TODO: check more flags + bool slow = !(cmd[0] & ISO15693_REQ_DATARATE_HIGH); + start_time = eof_time + DELAY_ISO15693_VCD_TO_VICC_SIM; + TransmitTo15693Reader(ToSend, ToSendMax, &start_time, 0, slow); + } + + Dbprintf("%d bytes read from reader:", cmd_len); + Dbhexdump(cmd_len, cmd, false); + } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + LED_A_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) { + LED_A_ON(); + + uint8_t data[6]; + uint8_t recv[ISO15693_MAX_RESPONSE_LENGTH]; + int datalen = 0, recvlen = 0; + uint32_t eof_time; + + // first without AFI + // Tags should respond without AFI and with AFI=0 even when AFI is active + + data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_SLOT1; + data[1] = ISO15693_INVENTORY; + data[2] = 0; // mask length + datalen = Iso15693AddCrc(data,3); + uint32_t start_time = GetCountSspClk(); + recvlen = SendDataTag(data, datalen, true, speed, recv, sizeof(recv), 0, ISO15693_READER_TIMEOUT, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; + WDT_HIT(); + if (recvlen>=12) { + Dbprintf("NoAFI UID=%s", Iso15693sprintUID(NULL, &recv[2])); + } + + // now with AFI + + data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_AFI | ISO15693_REQINV_SLOT1; + data[1] = ISO15693_INVENTORY; + data[2] = 0; // AFI + data[3] = 0; // mask length + + for (int i = 0; i < 256; i++) { + data[2] = i & 0xFF; + datalen = Iso15693AddCrc(data,4); + recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time, ISO15693_READER_TIMEOUT, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; + WDT_HIT(); + if (recvlen >= 12) { + Dbprintf("AFI=%i UID=%s", i, Iso15693sprintUID(NULL, &recv[2])); + } + } + Dbprintf("AFI Bruteforcing done."); + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + LED_A_OFF(); + +} + +// 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[]) { + + LED_A_ON(); + + int recvlen = 0; + uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; + uint32_t eof_time; + + uint16_t timeout; + bool request_answer = false; + + switch (data[1]) { + case ISO15693_WRITEBLOCK: + case ISO15693_LOCKBLOCK: + case ISO15693_WRITE_MULTI_BLOCK: + case ISO15693_WRITE_AFI: + case ISO15693_LOCK_AFI: + case ISO15693_WRITE_DSFID: + case ISO15693_LOCK_DSFID: + timeout = ISO15693_READER_TIMEOUT_WRITE; + request_answer = data[0] & ISO15693_REQ_OPTION; + break; + default: + timeout = ISO15693_READER_TIMEOUT; + } + + if (DEBUG) { + Dbprintf("SEND:"); + Dbhexdump(datalen, data, false); + } + + recvlen = SendDataTag(data, datalen, true, speed, (recv?recvbuf:NULL), sizeof(recvbuf), 0, timeout, &eof_time); + + if (request_answer) { // send a single EOF to get the tag response + recvlen = SendDataTagEOF((recv?recvbuf:NULL), sizeof(recvbuf), 0, ISO15693_READER_TIMEOUT, &eof_time); + } + + // for the time being, switch field off to protect rdv4.0 + // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + + if (recv) { + if (DEBUG) { + Dbprintf("RECV:"); + if (recvlen > 0) { + Dbhexdump(recvlen, recvbuf, false); + DbdecodeIso15693Answer(recvlen, recvbuf); + } + } + if (recvlen > ISO15693_MAX_RESPONSE_LENGTH) { + recvlen = ISO15693_MAX_RESPONSE_LENGTH; + } + cmd_send(CMD_ACK, recvlen, 0, 0, recvbuf, ISO15693_MAX_RESPONSE_LENGTH); + } + + LED_A_OFF(); +} + +//----------------------------------------------------------------------------- +// Work with "magic Chinese" card. +// +//----------------------------------------------------------------------------- + +// Set the UID on Magic ISO15693 tag (based on Iceman's LUA-script). +void SetTag15693Uid(uint8_t *uid) { + + LED_A_ON(); + + uint8_t cmd[4][9] = { + {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x3e, 0x00, 0x00, 0x00, 0x00}, + {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x3f, 0x69, 0x96, 0x00, 0x00}, + {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x38}, + {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x39} + }; + + uint16_t crc; + + int recvlen = 0; + uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH]; + uint32_t eof_time; + + // Command 3 : 022138u8u7u6u5 (where uX = uid byte X) + cmd[2][3] = uid[7]; + cmd[2][4] = uid[6]; + cmd[2][5] = uid[5]; + cmd[2][6] = uid[4]; + + // Command 4 : 022139u4u3u2u1 (where uX = uid byte X) + cmd[3][3] = uid[3]; + cmd[3][4] = uid[2]; + cmd[3][5] = uid[1]; + cmd[3][6] = uid[0]; + + uint32_t start_time = 0; + + for (int i = 0; i < 4; i++) { + // Add the CRC + crc = Iso15693Crc(cmd[i], 7); + cmd[i][7] = crc & 0xff; + cmd[i][8] = crc >> 8; + + recvlen = SendDataTag(cmd[i], sizeof(cmd[i]), i==0?true:false, true, recvbuf, sizeof(recvbuf), start_time, ISO15693_READER_TIMEOUT_WRITE, &eof_time); + start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER; + if (DEBUG) { + Dbprintf("SEND:"); + Dbhexdump(sizeof(cmd[i]), cmd[i], false); + Dbprintf("RECV:"); + if (recvlen > 0) { + Dbhexdump(recvlen, recvbuf, false); + DbdecodeIso15693Answer(recvlen, recvbuf); + } + } + // Note: need to know if we expect an answer from one of the magic commands + // if (recvlen < 0) { + // break; + // } + } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + + cmd_send(CMD_ACK, recvlen, 0, 0, recvbuf, recvlen); + LED_A_OFF(); +} + + + +// -------------------------------------------------------------------- +// -- 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 security status of the block + // followed by the 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 = Iso15693Crc(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 security status of the block + // followed by the 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 = Iso15693Crc(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 security status of the block + // followed by the 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 = Iso15693Crc(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 security status of the block + // followed by the 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 manufacturer code + cmd[11] = 0x00; + +// cmd[12] = 0x00; +// cmd[13] = 0x00; //Now the CRC + crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes + cmd[12] = crc & 0xff; + cmd[13] = crc >> 8; + + CodeIso15693AsReader(cmd, sizeof(cmd)); +} + + + + +*/ + +