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1 //-----------------------------------------------------------------------------
2 //
3 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
4 // at your option, any later version. See the LICENSE.txt file for the text of
5 // the license.
6 //-----------------------------------------------------------------------------
7 // Low frequency Honeywell NexWatch tag commands
8 // PSK1 RF/16, RF/2, 128 bits long (known)
9 //-----------------------------------------------------------------------------
10
11 #include "cmdlfnexwatch.h"
12
13 #include <stdio.h>
14 #include <string.h>
15 #include <inttypes.h>
16 #include <stdbool.h>
17 #include "comms.h"
18 #include "ui.h"
19 #include "util.h"
20 #include "graph.h"
21 #include "cmdparser.h"
22 #include "cmddata.h"
23 #include "cmdlf.h"
24 #include "lfdemod.h"
25
26 static int CmdHelp(const char *Cmd);
27
28 int CmdPSKNexWatch(const char *Cmd)
29 {
30 if (!PSKDemod("", false)) return 0;
31 uint8_t preamble[28] = {0,0,0,0,0,1,0,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
32 size_t startIdx = 0, size = DemodBufferLen;
33 bool invert = false;
34 if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)){
35 // if didn't find preamble try again inverting
36 if (!PSKDemod("1", false)) return 0;
37 size = DemodBufferLen;
38 if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)) return 0;
39 invert = true;
40 }
41 if (size != 128) return 0;
42 setDemodBuf(DemodBuffer, size, startIdx+4);
43 setClockGrid(g_DemodClock, g_DemodStartIdx + ((startIdx+4)*g_DemodClock));
44 startIdx = 8+32; // 8 = preamble, 32 = reserved bits (always 0)
45 //get ID
46 uint32_t ID = 0;
47 for (uint8_t wordIdx=0; wordIdx<4; wordIdx++){
48 for (uint8_t idx=0; idx<8; idx++){
49 ID = (ID << 1) | DemodBuffer[startIdx+wordIdx+(idx*4)];
50 }
51 }
52 //parity check (TBD)
53
54 //checksum check (TBD)
55
56 //output
57 PrintAndLog("NexWatch ID: %d", ID);
58 if (invert){
59 PrintAndLog("Had to Invert - probably NexKey");
60 for (uint8_t idx=0; idx<size; idx++)
61 DemodBuffer[idx] ^= 1;
62 }
63
64 CmdPrintDemodBuff("x");
65 return 1;
66 }
67
68 //by marshmellow
69 //see ASKDemod for what args are accepted
70 int CmdNexWatchRead(const char *Cmd) {
71 // read lf silently
72 lf_read(true, 10000);
73 // demod and output viking ID
74 return CmdPSKNexWatch(Cmd);
75 }
76
77 static command_t CommandTable[] = {
78 {"help", CmdHelp, 1, "This help"},
79 {"demod", CmdPSKNexWatch, 1, "Demodulate a NexWatch tag (nexkey, quadrakey) from the GraphBuffer"},
80 {"read", CmdNexWatchRead, 0, "Attempt to Read and Extract tag data from the antenna"},
81 {NULL, NULL, 0, NULL}
82 };
83
84 int CmdLFNexWatch(const char *Cmd) {
85 CmdsParse(CommandTable, Cmd);
86 return 0;
87 }
88
89 int CmdHelp(const char *Cmd) {
90 CmdsHelp(CommandTable);
91 return 0;
92 }
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