+// ISO11784/85 demod (aka animal tag) BIPHASE, inverted, rf/32, with preamble of 00000000001 (128bits)
+// 8 databits + 1 parity (1)
+// CIITT 16 chksum
+// NATIONAL CODE, ICAR database
+// COUNTRY CODE (ISO3166)
+// FLAG (animal/non-animal)
+int CmdIso11784demodBI(const char *Cmd){
+
+ int invert = 1;
+ int clk = 32;
+ int errCnt = 0;
+ uint8_t BitStream[MAX_DEMOD_BUF_LEN];
+ size_t size = getFromGraphBuf(BitStream);
+
+ errCnt = askdemod(BitStream, &size, &clk, &invert, 0, 0, 0);
+ if ( errCnt<0 ) {
+ if (g_debugMode) PrintAndLog("DEBUG: no data found %d, clock: 32", errCnt);
+ return 0;
+ }
+
+ errCnt = BiphaseRawDecode(BitStream, &size, 0, 1);
+ if (errCnt < 0){
+ if (g_debugMode) PrintAndLog("Error BiphaseRawDecode: %d", errCnt);
+ return 0;
+ }
+
+
+
+ int preambleIndex = ISO11784demodBI(BitStream, &size);
+ if (preambleIndex < 0){
+ if (g_debugMode) PrintAndLog("Error ISO11784Demod , no startmarker found :: %d",preambleIndex);
+ return 0;
+ }
+
+
+ size = removeParity(BitStream, preambleIndex + 11, 9, 1, 128);
+ if ( size <= 0 ) {
+ if (g_debugMode) PrintAndLog("Error removeParity:: %d", size);
+ return 0;
+ }
+ PrintAndLog("startmarker %d; Size %d", preambleIndex, size);
+
+ return 1;
+ //got a good demod
+ uint8_t ByteStream[16] = {0x00};
+ uint8_t bitCnt = 0;
+ uint8_t ByteCnt = 0;
+ size_t startIdx = preambleIndex + 11; //start after preamble
+ for (size_t idx = 0; idx < size-11; idx++){
+
+ //lsb first
+ ByteStream[ByteCnt] = ByteStream[ByteCnt] | (BitStream[startIdx+idx] << bitCnt);
+ bitCnt++;
+ if (bitCnt % 8 == 0){
+ if (g_debugMode) PrintAndLog("byte %d: %02x", ByteCnt, ByteStream[ByteCnt]);
+ bitCnt = 0;
+ ByteCnt++;
+ }
+ }
+ //now ByteStream contains 16 bytes of decrypted raw tag data
+ setDemodBuf(ByteStream, 128, 0);
+ //printDemodBuff();
+ return 1;
+}
+
+