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1 | ## |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2015 Benjamin Larsson <benjamin@southpole.se> | |
5 | ## | |
6 | ## This program is free software; you can redistribute it and/or modify | |
7 | ## it under the terms of the GNU General Public License as published by | |
8 | ## the Free Software Foundation; either data 2 of the License, or | |
9 | ## (at your option) any later data. | |
10 | ## | |
11 | ## This program is distributed in the hope that it will be useful, | |
12 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ## GNU General Public License for more details. | |
15 | ## | |
16 | ## You should have received a copy of the GNU General Public License | |
17 | ## along with this program; if not, write to the Free Software | |
18 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | ## | |
20 | ||
21 | import sigrokdecode as srd | |
22 | ||
23 | class SamplerateError(Exception): | |
24 | pass | |
25 | ||
26 | class Decoder(srd.Decoder): | |
27 | api_version = 2 | |
28 | id = 'em4100' | |
29 | name = 'EM4100' | |
30 | longname = 'RFID EM4100' | |
31 | desc = 'EM4100 100-150kHz RFID protocol.' | |
32 | license = 'gplv2+' | |
33 | inputs = ['logic'] | |
34 | outputs = ['em4100'] | |
35 | channels = ( | |
36 | {'id': 'data', 'name': 'Data', 'desc': 'Data line'}, | |
37 | ) | |
38 | options = ( | |
39 | {'id': 'polarity', 'desc': 'Polarity', 'default': 'active-high', | |
40 | 'values': ('active-low', 'active-high')}, | |
41 | {'id': 'datarate' , 'desc': 'Data rate', 'default': '64', | |
42 | 'values': ('64', '32', '16')}, | |
43 | # {'id': 'coding', 'desc': 'Bit coding', 'default': 'biphase', | |
44 | # 'values': ('biphase', 'manchester', 'psk')}, | |
45 | {'id': 'coilfreq', 'desc': 'Coil frequency', 'default': '125000'}, | |
46 | ) | |
47 | annotations = ( | |
48 | ('headerbit', 'Header bit'), | |
49 | ('databit', 'Version bit'), | |
50 | ('rowparity', 'Row Parity'), | |
51 | ('databit', 'Data bit'), | |
52 | ('colparity', 'Column Parity'), | |
53 | ('stopbit', 'Stop bit'), | |
54 | ('rowparity_check', 'Row Parity Check'), | |
55 | ) | |
56 | annotation_rows = ( | |
57 | ('bits', 'Bits', (0,)), | |
58 | ('fields', 'Fields', (1, 2, 4, 7)), | |
59 | ('value', 'Value', (3, 5, 6, 8)), | |
60 | ) | |
61 | ||
62 | def __init__(self, **kwargs): | |
63 | self.samplerate = None | |
64 | self.oldpin = None | |
65 | self.last_samplenum = None | |
66 | self.lastlast_samplenum = None | |
67 | self.last_edge = 0 | |
68 | self.bit_width = 0 | |
69 | self.halfbit_limit = 0 | |
70 | self.oldpp = 0 | |
71 | self.oldpl = 0 | |
72 | self.oldsamplenum = 0 | |
73 | self.last_bit_pos = 0 | |
74 | self.first_start = 0 | |
75 | self.first_one = 0 | |
76 | self.state = 'HEADER' | |
77 | self.data = 0 | |
78 | self.data_bits = 0 | |
79 | self.data_start = 0 | |
80 | self.data_parity = 0 | |
81 | self.payload_cnt = 0 | |
82 | self.data_col_parity = [0, 0, 0, 0, 0, 0] | |
83 | self.col_parity = [0, 0, 0, 0, 0, 0] | |
84 | ||
85 | def metadata(self, key, value): | |
86 | if key == srd.SRD_CONF_SAMPLERATE: | |
87 | self.samplerate = value | |
88 | self.bit_width = (self.samplerate / (int(self.options['coilfreq']))) * int(self.options['datarate']) | |
89 | self.halfbit_limit = self.bit_width/2 + self.bit_width/4 | |
90 | self.polarity = 0 if self.options['polarity'] == 'active-low' else 1 | |
91 | ||
92 | def start(self): | |
93 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
94 | ||
95 | def add_bit(self, bit, bit_start, bit_stop): | |
96 | if self.state == 'HEADER': | |
97 | if bit == 1: | |
98 | if self.first_one > 0: | |
99 | self.first_one += 1 | |
100 | if self.first_one == 9: | |
101 | self.put(int(self.first_start), int(bit_stop), self.out_ann, | |
102 | [1, ['Header', 'Head', 'He', 'H']]) | |
103 | self.first_one = 0 | |
104 | self.state = 'PAYLOAD' | |
105 | return | |
106 | if self.first_one == 0: | |
107 | self.first_one = 1 | |
108 | self.first_start = bit_start | |
109 | ||
110 | if bit == 0: | |
111 | self.first_one = 0 | |
112 | return | |
113 | ||
114 | if self.state == 'PAYLOAD': | |
115 | self.payload_cnt += 1 | |
116 | if self.data_bits == 0: | |
117 | self.data_start = bit_start | |
118 | self.data = 0 | |
119 | self.data_parity = 0 | |
120 | self.data_bits += 1 | |
121 | if self.data_bits == 5: | |
122 | self.put(int(self.data_start), int(bit_start), self.out_ann, | |
123 | [2, ['Data', 'Da', 'D']]) | |
124 | self.put(int(bit_start), int(bit_stop), self.out_ann, | |
125 | [4, ['Parity', 'Par', 'Pa', 'P']]) | |
126 | self.put(int(self.data_start), int(bit_start), self.out_ann, | |
127 | [3, [str("%X" % self.data)]]) | |
128 | if self.data_parity == bit: | |
129 | p_string = ['OK', 'O'] | |
130 | else: | |
131 | p_string = ['ERROR', 'ERR', 'ER', 'E'] | |
132 | self.put(int(bit_start), int(bit_stop), self.out_ann, | |
133 | [6, p_string]) | |
134 | self.data_bits = 0 | |
135 | if self.payload_cnt == 50: | |
136 | self.state = 'TRAILER' | |
137 | self.payload_cnt = 0 | |
138 | ||
139 | self.data_parity ^= bit | |
140 | self.data_col_parity[self.data_bits] ^= bit | |
141 | self.data = (self.data << 1) | bit | |
142 | return | |
143 | ||
144 | if self.state == 'TRAILER': | |
145 | self.payload_cnt += 1 | |
146 | if self.data_bits == 0: | |
147 | self.data_start = bit_start | |
148 | self.data = 0 | |
149 | self.data_parity = 0 | |
150 | self.data_bits += 1 | |
151 | self.col_parity[self.data_bits] = bit | |
152 | ||
153 | if self.data_bits == 5: | |
154 | p_string = ['ERROR', 'ERR', 'ER', 'E'] | |
155 | if self.data_col_parity[1] == self.col_parity[1]: | |
156 | if self.data_col_parity[2] == self.col_parity[2]: | |
157 | if self.data_col_parity[3] == self.col_parity[3]: | |
158 | if self.data_col_parity[4] == self.col_parity[4]: | |
159 | p_string = ['OK', 'O'] | |
160 | ||
161 | self.put(int(self.data_start), int(bit_start), self.out_ann, | |
162 | [4, ['Column parity', 'Col par', 'CP', 'P']]) | |
163 | self.put(int(bit_start), int(bit_stop), self.out_ann, | |
164 | [4, ['Stop bit', 'St bi', 'SB', 'S']]) | |
165 | self.put(int(self.data_start), int(bit_start), self.out_ann, | |
166 | [6, p_string]) | |
167 | ||
168 | self.data_bits = 0 | |
169 | if self.payload_cnt == 5: | |
170 | self.state = 'HEADER' | |
171 | self.payload_cnt = 0 | |
172 | self.data_col_parity = [0, 0, 0, 0, 0, 0] | |
173 | self.col_parity = [0, 0, 0, 0, 0, 0] | |
174 | ||
175 | def putbit(self, bit, bit_start, bit_stop): | |
176 | self.put(int(bit_start), int(bit_stop), self.out_ann, | |
177 | [0, [str(bit)]]) | |
178 | self.add_bit(bit, bit_start, bit_stop) | |
179 | ||
180 | def manchester_decode(self, samplenum, pl, pp, pin): | |
181 | bit_start = 0 | |
182 | bit_stop = 0 | |
183 | bit = self.oldpin ^ self.polarity | |
184 | if pl > self.halfbit_limit: | |
185 | samples = samplenum - self.oldsamplenum | |
186 | t = samples / self.samplerate | |
187 | ||
188 | if self.oldpl > self.halfbit_limit: | |
189 | bit_start = int(self.oldsamplenum - self.oldpl/2) | |
190 | bit_stop = int(samplenum - pl/2) | |
191 | self.putbit(bit, bit_start, bit_stop) | |
192 | if self.oldpl <= self.halfbit_limit: | |
193 | bit_start = int(self.oldsamplenum - self.oldpl) | |
194 | bit_stop = int(samplenum - pl/2) | |
195 | self.putbit(bit, bit_start, bit_stop) | |
196 | self.last_bit_pos = int(samplenum - pl/2) | |
197 | ||
198 | if pl < self.halfbit_limit: | |
199 | samples = samplenum - self.oldsamplenum | |
200 | t = samples / self.samplerate | |
201 | ||
202 | if self.oldpl > self.halfbit_limit: | |
203 | bit_start = self.oldsamplenum - self.oldpl/2 | |
204 | bit_stop = int(samplenum) | |
205 | self.putbit(bit, bit_start, bit_stop) | |
206 | self.last_bit_pos = int(samplenum) | |
207 | if self.oldpl <= self.halfbit_limit: | |
208 | if self.last_bit_pos <= self.oldsamplenum - self.oldpl: | |
209 | bit_start = self.oldsamplenum - self.oldpl | |
210 | bit_stop = int(samplenum) | |
211 | self.putbit(bit, bit_start, bit_stop) | |
212 | self.last_bit_pos = int(samplenum) | |
213 | ||
214 | def decode(self, ss, es, data): | |
215 | if not self.samplerate: | |
216 | raise SamplerateError('Cannot decode without samplerate.') | |
217 | for (samplenum, (pin,)) in data: | |
218 | # Ignore identical samples early on (for performance reasons). | |
219 | if self.oldpin == pin: | |
220 | continue | |
221 | ||
222 | if self.oldpin is None: | |
223 | self.oldpin = pin | |
224 | self.last_samplenum = samplenum | |
225 | self.lastlast_samplenum = samplenum | |
226 | self.last_edge = samplenum | |
227 | self.oldpl = 0 | |
228 | self.oldpp = 0 | |
229 | self.oldsamplenum = 0 | |
230 | self.last_bit_pos = 0 | |
231 | continue | |
232 | ||
233 | if self.oldpin != pin: | |
234 | pl = samplenum - self.oldsamplenum | |
235 | pp = pin | |
236 | ||
237 | self.manchester_decode(samplenum, pl, pp, pin) | |
238 | ||
239 | self.oldpl = pl | |
240 | self.oldpp = pp | |
241 | self.oldsamplenum = samplenum | |
242 | self.oldpin = pin |