+ UsbCommand c;\r
+ int res=0;\r
+\r
+ c.cmd = CMD_WRITE_TI_TYPE;\r
+ res = sscanf(str, "0x%x 0x%x 0x%x ", &c.ext1, &c.ext2, &c.ext3);\r
+ if (res == 2) c.ext3=0;\r
+ if (res<2)\r
+ PrintToScrollback("Please specify the data as two hex strings, optionally the CRC as a third");\r
+ else\r
+ SendCommand(&c, FALSE);\r
+}\r
+\r
+static void CmdTIDemod(char *cmdline)\r
+{\r
+ /* MATLAB as follows:\r
+f_s = 2000000; % sampling frequency\r
+f_l = 123200; % low FSK tone\r
+f_h = 134200; % high FSK tone\r
+\r
+T_l = 119e-6; % low bit duration\r
+T_h = 130e-6; % high bit duration\r
+\r
+l = 2*pi*ones(1, floor(f_s*T_l))*(f_l/f_s);\r
+h = 2*pi*ones(1, floor(f_s*T_h))*(f_h/f_s);\r
+\r
+l = sign(sin(cumsum(l)));\r
+h = sign(sin(cumsum(h)));\r
+ */\r
+\r
+// 2M*16/134.2k = 238\r
+ static const int LowTone[] = {\r
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1\r
+ };\r
+// 2M*16/123.2k = 260\r
+ static const int HighTone[] = {\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1,\r
+ 1, 1, 1, 1, 1, 1, 1, 1\r
+ };\r
+ int lowLen = sizeof(LowTone)/sizeof(int);\r
+ int highLen = sizeof(HighTone)/sizeof(int);\r
+ int convLen = (highLen>lowLen)?highLen:lowLen;\r
+ WORD crc;\r
+ int i, j, TagType;\r
+ int lowSum = 0, highSum = 0;;\r
+ int lowTot = 0, highTot = 0;\r
+\r
+ for(i = 0; i < GraphTraceLen - convLen; i++) {\r
+ lowSum = 0;\r
+ highSum = 0;;\r
+\r
+ for(j = 0; j < lowLen; j++) {\r
+ lowSum += LowTone[j]*GraphBuffer[i+j];\r
+ }\r
+ for(j = 0; j < highLen; j++) {\r
+ highSum += HighTone[j]*GraphBuffer[i+j];\r
+ }\r
+ lowSum = abs((100*lowSum) / lowLen);\r
+ highSum = abs((100*highSum) / highLen);\r
+ lowSum = (lowSum<0)?-lowSum:lowSum;\r
+ highSum = (highSum<0)?-highSum:highSum;\r
+\r
+ GraphBuffer[i] = (highSum << 16) | lowSum;\r
+ }\r
+\r
+ for(i = 0; i < GraphTraceLen - convLen - 16; i++) {\r
+ lowTot = 0;\r
+ highTot = 0;\r
+ // 16 and 15 are f_s divided by f_l and f_h, rounded\r
+ for(j = 0; j < 16; j++) {\r
+ lowTot += (GraphBuffer[i+j] & 0xffff);\r
+ }\r
+ for(j = 0; j < 15; j++) {\r
+ highTot += (GraphBuffer[i+j] >> 16);\r
+ }\r
+ GraphBuffer[i] = lowTot - highTot;\r
+ }\r
+\r
+ GraphTraceLen -= (convLen + 16);\r
+\r
+ RepaintGraphWindow();\r
+\r
+ // TI tag data format is 16 prebits, 8 start bits, 64 data bits,\r
+ // 16 crc CCITT bits, 8 stop bits, 15 end bits\r
+\r
+ // the 16 prebits are always low\r
+ // the 8 start and stop bits of a tag must match\r
+ // the start/stop prebits of a ro tag are 01111110\r
+ // the start/stop prebits of a rw tag are 11111110\r
+ // the 15 end bits of a ro tag are all low\r
+ // the 15 end bits of a rw tag match bits 15-1 of the data bits\r
+\r
+ // Okay, so now we have unsliced soft decisions;\r
+ // find bit-sync, and then get some bits.\r
+ // look for 17 low bits followed by 6 highs (common pattern for ro and rw tags)\r
+ int max = 0, maxPos = 0;\r
+ for(i = 0; i < 6000; i++) {\r
+ int j;\r
+ int dec = 0;\r
+ // searching 17 consecutive lows\r
+ for(j = 0; j < 17*lowLen; j++) {\r
+ dec -= GraphBuffer[i+j];\r
+ }\r
+ // searching 7 consecutive highs\r
+ for(; j < 17*lowLen + 6*highLen; j++) {\r
+ dec += GraphBuffer[i+j];\r
+ }\r
+ if(dec > max) {\r
+ max = dec;\r
+ maxPos = i;\r
+ }\r
+ }\r
+\r
+ // place a marker in the buffer to visually aid location\r
+ // of the start of sync\r
+ GraphBuffer[maxPos] = 800;\r
+ GraphBuffer[maxPos+1] = -800;\r
+\r
+ // advance pointer to start of actual data stream (after 16 pre and 8 start bits)\r
+ maxPos += 17*lowLen;\r
+ maxPos += 6*highLen;\r
+\r
+ // place a marker in the buffer to visually aid location\r
+ // of the end of sync\r
+ GraphBuffer[maxPos] = 800;\r
+ GraphBuffer[maxPos+1] = -800;\r
+\r
+ PrintToScrollback("actual data bits start at sample %d", maxPos);\r
+\r
+ PrintToScrollback("length %d/%d", highLen, lowLen);\r
+\r
+ BYTE bits[1+64+16+8+16];\r
+ bits[sizeof(bits)-1] = '\0';\r
+\r
+ DWORD shift3 = 0x7e000000, shift2 = 0, shift1 = 0, shift0 = 0;\r
+\r
+ for(i = 0; i < arraylen(bits)-1; i++) {\r
+ int high = 0;\r
+ int low = 0;\r
+ int j;\r
+ for(j = 0; j < lowLen; j++) {\r
+ low -= GraphBuffer[maxPos+j];\r
+ }\r
+ for(j = 0; j < highLen; j++) {\r
+ high += GraphBuffer[maxPos+j];\r
+ }\r
+\r
+ if(high > low) {\r
+ bits[i] = '1';\r
+ maxPos += highLen;\r
+ // bitstream arrives lsb first so shift right\r
+ shift3 |= (1<<31);\r
+ } else {\r
+ bits[i] = '.';\r
+ maxPos += lowLen;\r
+ }\r
+\r
+ // 128 bit right shift register\r
+ shift0 = (shift0>>1) | (shift1 << 31);\r
+ shift1 = (shift1>>1) | (shift2 << 31);\r
+ shift2 = (shift2>>1) | (shift3 << 31);\r
+ shift3 >>= 1;\r
+\r
+ // place a marker in the buffer between bits to visually aid location\r
+ GraphBuffer[maxPos] = 800;\r
+ GraphBuffer[maxPos+1] = -800;\r
+ }\r
+ PrintToScrollback("Info: raw tag bits = %s", bits);\r
+\r
+ TagType = (shift3>>8)&0xff;\r
+ if ( TagType != ((shift0>>16)&0xff) ) {\r
+ PrintToScrollback("Error: start and stop bits do not match!");\r
+ return;\r
+ }\r
+ else if (TagType == 0x7e) {\r
+ PrintToScrollback("Info: Readonly TI tag detected.");\r
+ return;\r
+ }\r
+ else if (TagType == 0xfe) {\r
+ PrintToScrollback("Info: Rewriteable TI tag detected.");\r
+\r
+ // put 64 bit data into shift1 and shift0\r
+ shift0 = (shift0>>24) | (shift1 << 8);\r
+ shift1 = (shift1>>24) | (shift2 << 8);\r
+\r
+ // align 16 bit crc into lower half of shift2\r
+ shift2 = ((shift2>>24) | (shift3 << 8)) & 0x0ffff;\r
+\r
+ // align 16 bit "end bits" or "ident" into lower half of shift3\r
+ shift3 >>= 16;\r
+\r
+ // only 15 bits compare, last bit of ident is not valid\r
+ if ( (shift3^shift0)&0x7fff ) {\r
+ PrintToScrollback("Error: Ident mismatch!");\r
+ }\r
+ // WARNING the order of the bytes in which we calc crc below needs checking\r
+ // i'm 99% sure the crc algorithm is correct, but it may need to eat the\r
+ // bytes in reverse or something\r
+ // calculate CRC\r
+ crc=0;\r
+ crc = update_crc16(crc, (shift0)&0xff);\r
+ crc = update_crc16(crc, (shift0>>8)&0xff);\r
+ crc = update_crc16(crc, (shift0>>16)&0xff);\r
+ crc = update_crc16(crc, (shift0>>24)&0xff);\r
+ crc = update_crc16(crc, (shift1)&0xff);\r
+ crc = update_crc16(crc, (shift1>>8)&0xff);\r
+ crc = update_crc16(crc, (shift1>>16)&0xff);\r
+ crc = update_crc16(crc, (shift1>>24)&0xff);\r
+ PrintToScrollback("Info: Tag data = %08X%08X", shift1, shift0);\r
+ if (crc != (shift2&0xffff)) {\r
+ PrintToScrollback("Error: CRC mismatch, calculated %04X, got ^04X", crc, shift2&0xffff);\r
+ } else {\r
+ PrintToScrollback("Info: CRC %04X is good", crc);\r
+ }\r
+ }\r
+ else {\r
+ PrintToScrollback("Unknown tag type.");\r
+ return;\r
+ }\r
+}\r
+\r
+static void CmdNorm(char *str)\r
+{\r
+ int i;\r
+ int max = INT_MIN, min = INT_MAX;\r
+ for(i = 10; i < GraphTraceLen; i++) {\r