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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 | |
88df2c9a UH |
8 | ## the Free Software Foundation; either version 2 of the License, or |
9 | ## (at your option) any later version. | |
8f265907 BL |
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 | |
4539e9ca | 17 | ## along with this program; if not, see <http://www.gnu.org/licenses/>. |
8f265907 BL |
18 | ## |
19 | ||
20 | import sigrokdecode as srd | |
21 | ||
22 | class SamplerateError(Exception): | |
23 | pass | |
24 | ||
25 | class Decoder(srd.Decoder): | |
afb0d233 | 26 | api_version = 3 |
8f265907 BL |
27 | id = 'em4100' |
28 | name = 'EM4100' | |
29 | longname = 'RFID EM4100' | |
30 | desc = 'EM4100 100-150kHz RFID protocol.' | |
31 | license = 'gplv2+' | |
32 | inputs = ['logic'] | |
6cbba91f | 33 | outputs = [] |
d6d8a8a4 | 34 | tags = ['IC', 'RFID'] |
8f265907 BL |
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')}, | |
1a782fad UH |
41 | {'id': 'datarate' , 'desc': 'Data rate', 'default': 64, |
42 | 'values': (64, 32, 16)}, | |
8f265907 BL |
43 | # {'id': 'coding', 'desc': 'Bit coding', 'default': 'biphase', |
44 | # 'values': ('biphase', 'manchester', 'psk')}, | |
1a782fad | 45 | {'id': 'coilfreq', 'desc': 'Coil frequency', 'default': 125000}, |
8f265907 BL |
46 | ) |
47 | annotations = ( | |
428e40cb UH |
48 | ('bit', 'Bit'), |
49 | ('header', 'Header'), | |
50 | ('version-customer', 'Version/customer'), | |
51 | ('data', 'Data'), | |
52 | ('rowparity-ok', 'Row parity OK'), | |
53 | ('rowparity-err', 'Row parity error'), | |
54 | ('colparity-ok', 'Column parity OK'), | |
55 | ('colparity-err', 'Column parity error'), | |
8f265907 | 56 | ('stopbit', 'Stop bit'), |
428e40cb | 57 | ('tag', 'Tag'), |
8f265907 BL |
58 | ) |
59 | annotation_rows = ( | |
60 | ('bits', 'Bits', (0,)), | |
428e40cb UH |
61 | ('fields', 'Fields', (1, 2, 3, 4, 5, 6, 7, 8)), |
62 | ('tags', 'Tags', (9,)), | |
8f265907 BL |
63 | ) |
64 | ||
92b7b49f | 65 | def __init__(self): |
10aeb8ea GS |
66 | self.reset() |
67 | ||
68 | def reset(self): | |
8f265907 BL |
69 | self.samplerate = None |
70 | self.oldpin = None | |
71 | self.last_samplenum = None | |
72 | self.lastlast_samplenum = None | |
73 | self.last_edge = 0 | |
74 | self.bit_width = 0 | |
75 | self.halfbit_limit = 0 | |
76 | self.oldpp = 0 | |
77 | self.oldpl = 0 | |
78 | self.oldsamplenum = 0 | |
79 | self.last_bit_pos = 0 | |
5b0b88ce | 80 | self.ss_first = 0 |
8f265907 BL |
81 | self.first_one = 0 |
82 | self.state = 'HEADER' | |
83 | self.data = 0 | |
84 | self.data_bits = 0 | |
5b0b88ce | 85 | self.ss_data = 0 |
8f265907 BL |
86 | self.data_parity = 0 |
87 | self.payload_cnt = 0 | |
88 | self.data_col_parity = [0, 0, 0, 0, 0, 0] | |
89 | self.col_parity = [0, 0, 0, 0, 0, 0] | |
428e40cb UH |
90 | self.tag = 0 |
91 | self.all_row_parity_ok = True | |
92 | self.col_parity_pos = [] | |
8f265907 BL |
93 | |
94 | def metadata(self, key, value): | |
95 | if key == srd.SRD_CONF_SAMPLERATE: | |
96 | self.samplerate = value | |
1a782fad | 97 | self.bit_width = (self.samplerate / self.options['coilfreq']) * self.options['datarate'] |
8f265907 BL |
98 | self.halfbit_limit = self.bit_width/2 + self.bit_width/4 |
99 | self.polarity = 0 if self.options['polarity'] == 'active-low' else 1 | |
100 | ||
101 | def start(self): | |
102 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
103 | ||
91ae892d UH |
104 | def putbit(self, bit, ss, es): |
105 | self.put(ss, es, self.out_ann, [0, [str(bit)]]) | |
8f265907 BL |
106 | if self.state == 'HEADER': |
107 | if bit == 1: | |
108 | if self.first_one > 0: | |
109 | self.first_one += 1 | |
110 | if self.first_one == 9: | |
5b0b88ce | 111 | self.put(self.ss_first, es, self.out_ann, |
8f265907 BL |
112 | [1, ['Header', 'Head', 'He', 'H']]) |
113 | self.first_one = 0 | |
114 | self.state = 'PAYLOAD' | |
115 | return | |
116 | if self.first_one == 0: | |
117 | self.first_one = 1 | |
5b0b88ce | 118 | self.ss_first = ss |
8f265907 BL |
119 | |
120 | if bit == 0: | |
121 | self.first_one = 0 | |
122 | return | |
123 | ||
124 | if self.state == 'PAYLOAD': | |
125 | self.payload_cnt += 1 | |
126 | if self.data_bits == 0: | |
5b0b88ce | 127 | self.ss_data = ss |
8f265907 BL |
128 | self.data = 0 |
129 | self.data_parity = 0 | |
130 | self.data_bits += 1 | |
131 | if self.data_bits == 5: | |
428e40cb UH |
132 | s = 'Version/customer' if self.payload_cnt <= 10 else 'Data' |
133 | c = 2 if self.payload_cnt <= 10 else 3 | |
5b0b88ce | 134 | self.put(self.ss_data, ss, self.out_ann, |
428e40cb UH |
135 | [c, [s + ': %X' % self.data, '%X' % self.data]]) |
136 | s = 'OK' if self.data_parity == bit else 'ERROR' | |
137 | c = 4 if s == 'OK' else 5 | |
138 | if s == 'ERROR': | |
139 | self.all_row_parity_ok = False | |
13090f24 | 140 | self.put(ss, es, self.out_ann, |
428e40cb UH |
141 | [c, ['Row parity: ' + s, 'RP: ' + s, 'RP', 'R']]) |
142 | self.tag = (self.tag << 4) | self.data | |
8f265907 BL |
143 | self.data_bits = 0 |
144 | if self.payload_cnt == 50: | |
145 | self.state = 'TRAILER' | |
146 | self.payload_cnt = 0 | |
147 | ||
148 | self.data_parity ^= bit | |
149 | self.data_col_parity[self.data_bits] ^= bit | |
150 | self.data = (self.data << 1) | bit | |
151 | return | |
152 | ||
153 | if self.state == 'TRAILER': | |
154 | self.payload_cnt += 1 | |
155 | if self.data_bits == 0: | |
5b0b88ce | 156 | self.ss_data = ss |
8f265907 BL |
157 | self.data = 0 |
158 | self.data_parity = 0 | |
159 | self.data_bits += 1 | |
160 | self.col_parity[self.data_bits] = bit | |
13090f24 | 161 | self.col_parity_pos.append([ss, es]) |
8f265907 BL |
162 | |
163 | if self.data_bits == 5: | |
13090f24 | 164 | self.put(ss, es, self.out_ann, [8, ['Stop bit', 'SB', 'S']]) |
428e40cb UH |
165 | |
166 | for i in range(1, 5): | |
167 | s = 'OK' if self.data_col_parity[i] == \ | |
168 | self.col_parity[i] else 'ERROR' | |
169 | c = 6 if s == 'OK' else 7 | |
170 | self.put(self.col_parity_pos[i - 1][0], | |
171 | self.col_parity_pos[i - 1][1], self.out_ann, | |
172 | [c, ['Column parity %d: %s' % (i, s), | |
173 | 'CP%d: %s' % (i, s), 'CP%d' % i, 'C']]) | |
174 | ||
175 | # Emit an annotation for valid-looking tags. | |
176 | all_col_parity_ok = (self.data_col_parity[1:5] == self.col_parity[1:5]) | |
177 | if all_col_parity_ok and self.all_row_parity_ok: | |
5b0b88ce | 178 | self.put(self.ss_first, es, self.out_ann, |
428e40cb | 179 | [9, ['Tag: %010X' % self.tag, 'Tag', 'T']]) |
8f265907 | 180 | |
428e40cb | 181 | self.tag = 0 |
8f265907 | 182 | self.data_bits = 0 |
428e40cb | 183 | |
8f265907 BL |
184 | if self.payload_cnt == 5: |
185 | self.state = 'HEADER' | |
186 | self.payload_cnt = 0 | |
187 | self.data_col_parity = [0, 0, 0, 0, 0, 0] | |
188 | self.col_parity = [0, 0, 0, 0, 0, 0] | |
428e40cb UH |
189 | self.col_parity_pos = [] |
190 | self.all_row_parity_ok = True | |
8f265907 | 191 | |
afb0d233 | 192 | def manchester_decode(self, pl, pp, pin): |
8f265907 BL |
193 | bit = self.oldpin ^ self.polarity |
194 | if pl > self.halfbit_limit: | |
afb0d233 | 195 | es = int(self.samplenum - pl/2) |
8f265907 | 196 | if self.oldpl > self.halfbit_limit: |
13090f24 | 197 | ss = int(self.oldsamplenum - self.oldpl/2) |
91ae892d | 198 | else: |
13090f24 | 199 | ss = int(self.oldsamplenum - self.oldpl) |
91ae892d | 200 | self.putbit(bit, ss, es) |
afb0d233 | 201 | self.last_bit_pos = int(self.samplenum - pl/2) |
91ae892d | 202 | else: |
afb0d233 | 203 | es = int(self.samplenum) |
8f265907 | 204 | if self.oldpl > self.halfbit_limit: |
13090f24 | 205 | ss = int(self.oldsamplenum - self.oldpl/2) |
13090f24 | 206 | self.putbit(bit, ss, es) |
afb0d233 | 207 | self.last_bit_pos = int(self.samplenum) |
91ae892d | 208 | else: |
8f265907 | 209 | if self.last_bit_pos <= self.oldsamplenum - self.oldpl: |
13090f24 | 210 | ss = int(self.oldsamplenum - self.oldpl) |
13090f24 | 211 | self.putbit(bit, ss, es) |
afb0d233 | 212 | self.last_bit_pos = int(self.samplenum) |
8f265907 | 213 | |
afb0d233 | 214 | def decode(self): |
8f265907 BL |
215 | if not self.samplerate: |
216 | raise SamplerateError('Cannot decode without samplerate.') | |
afb0d233 GS |
217 | |
218 | # Initialize internal state from the very first sample. | |
1b9ef18b | 219 | (pin,) = self.wait() |
afb0d233 GS |
220 | self.oldpin = pin |
221 | self.last_samplenum = self.samplenum | |
222 | self.lastlast_samplenum = self.samplenum | |
223 | self.last_edge = self.samplenum | |
224 | self.oldpl = 0 | |
225 | self.oldpp = 0 | |
226 | self.oldsamplenum = 0 | |
227 | self.last_bit_pos = 0 | |
228 | ||
229 | while True: | |
230 | # Ignore identical samples, only process edges. | |
231 | (pin,) = self.wait({0: 'e'}) | |
232 | pl = self.samplenum - self.oldsamplenum | |
233 | pp = pin | |
234 | self.manchester_decode(pl, pp, pin) | |
235 | self.oldpl = pl | |
236 | self.oldpp = pp | |
237 | self.oldsamplenum = self.samplenum | |
238 | self.oldpin = pin |