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e04475c4 1//-----------------------------------------------------------------------------
2// Authored by Iceman
3//
4// This code is licensed to you under the terms of the GNU GPL, version 2 or,
5// at your option, any later version. See the LICENSE.txt file for the text of
6// the license.
7//-----------------------------------------------------------------------------
8// Low frequency COTAG commands
9//-----------------------------------------------------------------------------
ad939de5 10
11#include "cmdlfcotag.h"
12
7cb8516c 13#include <stdio.h>
14#include <string.h>
15#include <stdint.h>
ad939de5 16#include "comms.h"
7cb8516c 17#include "ui.h"
18#include "cmddata.h"
7cb8516c 19#include "lfdemod.h"
20#include "usb_cmd.h"
21#include "cmdmain.h"
e04475c4 22
23static int CmdHelp(const char *Cmd);
24
25int usage_lf_cotag_read(void){
26 PrintAndLog("Usage: lf COTAG read [h] <signaldata>");
27 PrintAndLog("Options:");
28 PrintAndLog(" h : This help");
29 PrintAndLog(" <0|1|2> : 0 - HIGH/LOW signal; maxlength bigbuff");
30 PrintAndLog(" : 1 - translation of HI/LO into bytes with manchester 0,1");
31 PrintAndLog(" : 2 - raw signal; maxlength bigbuff");
32 PrintAndLog("");
33 PrintAndLog("Sample:");
34 PrintAndLog(" lf cotag read 0");
35 PrintAndLog(" lf cotag read 1");
36 return 0;
37}
38
39// COTAG demod should be able to use GraphBuffer,
40// when data load samples
41int CmdCOTAGDemod(const char *Cmd) {
42
43 uint8_t bits[COTAG_BITS] = {0};
44 size_t bitlen = COTAG_BITS;
45 memcpy(bits, DemodBuffer, COTAG_BITS);
46
669959bc 47 uint8_t alignPos = 0;
48 int err = manrawdecode(bits, &bitlen, 1, &alignPos);
e04475c4 49 if (err){
50 if (g_debugMode) PrintAndLog("DEBUG: Error - COTAG too many errors: %d", err);
51 return -1;
52 }
53
54 setDemodBuf(bits, bitlen, 0);
55
56 //got a good demod
57 uint16_t cn = bytebits_to_byteLSBF(bits+1, 16);
58 uint32_t fc = bytebits_to_byteLSBF(bits+1+16, 8);
59
60 uint32_t raw1 = bytebits_to_byteLSBF(bits, 32);
61 uint32_t raw2 = bytebits_to_byteLSBF(bits+32, 32);
62 uint32_t raw3 = bytebits_to_byteLSBF(bits+64, 32);
63 uint32_t raw4 = bytebits_to_byteLSBF(bits+96, 32);
64
65 /*
66 fc 161: 1010 0001 -> LSB 1000 0101
67 cn 33593 1000 0011 0011 1001 -> LSB 1001 1100 1100 0001
68 cccc cccc cccc cccc ffffffff
69 0 1001 1100 1100 0001 1000 0101 0000 0000 100001010000000001111011100000011010000010000000000000000000000000000000000000000000000000000000100111001100000110000101000
70 1001 1100 1100 0001 10000101
71 */
72 PrintAndLog("COTAG Found: FC %u, CN: %u Raw: %08X%08X%08X%08X", fc, cn, raw1 ,raw2, raw3, raw4);
73 return 1;
74}
75
76// When reading a COTAG.
77// 0 = HIGH/LOW signal - maxlength bigbuff
78// 1 = translation for HI/LO into bytes with manchester 0,1 - length 300
79// 2 = raw signal - maxlength bigbuff
80int CmdCOTAGRead(const char *Cmd) {
81
82 if (Cmd[0] == 'h' || Cmd[0] == 'H') return usage_lf_cotag_read();
83
84 uint32_t rawsignal = 1;
85 sscanf(Cmd, "%u", &rawsignal);
86
87 UsbCommand c = {CMD_COTAG, {rawsignal, 0, 0}};
88 clearCommandBuffer();
89 SendCommand(&c);
90 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 7000) ) {
91 PrintAndLog("command execution time out");
92 return -1;
93 }
94
95 switch ( rawsignal ){
96 case 0:
97 case 2: {
98 CmdPlot("");
99 CmdGrid("384");
b9957414 100 getSamples(0, true); break;
e04475c4 101 }
102 case 1: {
e04475c4 103 UsbCommand response;
babca445 104 DemodBufferLen = COTAG_BITS;
105 if (!GetFromBigBuf(DemodBuffer, COTAG_BITS, 0, &response, 1000, true)) {
e04475c4 106 PrintAndLog("timeout while waiting for reply.");
107 return -1;
108 }
109 return CmdCOTAGDemod("");
110 }
111 }
112 return 0;
113}
114
115static command_t CommandTable[] = {
116 {"help", CmdHelp, 1, "This help"},
117 {"demod", CmdCOTAGDemod, 1, "Tries to decode a COTAG signal"},
118 {"read", CmdCOTAGRead, 0, "Attempt to read and extract tag data"},
119 {NULL, NULL, 0, NULL}
120};
121
122int CmdLFCOTAG(const char *Cmd) {
123 clearCommandBuffer();
124 CmdsParse(CommandTable, Cmd);
125 return 0;
126}
127
128int CmdHelp(const char *Cmd) {
129 CmdsHelp(CommandTable);
130 return 0;
131}
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