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[libsigrokdecode.git] / decoders / t55xx / pd.py
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e2bc7a1e
BL		 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.
e2bc7a1e
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/>.
e2bc7a1e
BL		 18##
19
20import sigrokdecode as srd
21
22class SamplerateError(Exception):
23 pass
24
25class Decoder(srd.Decoder):
26 api_version = 2
27 id = 't55xx'
28 name = 'T55xx'
29 longname = 'RFID T55xx'
30 desc = 'T55xx 100-150kHz RFID protocol.'
31 license = 'gplv2+'
32 inputs = ['logic']
33 outputs = ['t55xx']
34 channels = (
35 {'id': 'data', 'name': 'Data', 'desc': 'Data line'},
36 )
37 options = (
38 {'id': 'coilfreq', 'desc': 'Coil frequency', 'default': 125000},
39 {'id': 'start_gap', 'desc': 'Start gap min', 'default': 20},
40 {'id': 'w_gap', 'desc': 'Write gap min', 'default': 20},
41 {'id': 'w_one_min', 'desc': 'Write one min', 'default': 48},
42 {'id': 'w_one_max', 'desc': 'Write one max', 'default': 63},
43 {'id': 'w_zero_min', 'desc': 'Write zero min', 'default': 16},
44 {'id': 'w_zero_max', 'desc': 'Write zero max', 'default': 31},
45 {'id': 'em4100_decode', 'desc': 'EM4100 decode', 'default': 'on',
46 'values': ('on', 'off')},
47 )
48 annotations = (
49 ('bit_value', 'Bit value'),
50 ('start_gap', 'Start gap'),
51 ('write_gap', 'Write gap'),
52 ('write_mode_exit', 'Write mode exit'),
53 ('bit', 'Bit'),
54 ('opcode', 'Opcode'),
55 ('lock', 'Lock'),
56 ('data', 'Data'),
57 ('password', 'Password'),
58 ('address', 'Address'),
59 ('bitrate', 'Bitrate'),
60 )
61 annotation_rows = (
62 ('bits', 'Bits', (0,)),
63 ('structure', 'Structure', (1, 2, 3, 4)),
64 ('fields', 'Fields', (5, 6, 7, 8, 9)),
65 ('decode', 'Decode', (10,)),
66 )
67
92b7b49f 68 def __init__(self):
e2bc7a1e
BL		 69 self.samplerate = None
70 self.oldpin = None
71 self.last_samplenum = None
72 self.lastlast_samplenum = None
73 self.state = 'START_GAP'
74 self.bits_pos = [[0 for col in range(3)] for row in range(70)]
75 self.br_string = ['RF/8', 'RF/16', 'RF/32', 'RF/40',
76 'RF/50', 'RF/64', 'RF/100', 'RF/128']
77 self.mod_str1 = ['Direct', 'Manchester', 'Biphase', 'Reserved']
78 self.mod_str2 = ['Direct', 'PSK1', 'PSK2', 'PSK3', 'FSK1', 'FSK2',
79 'FSK1a', 'FSK2a']
80 self.pskcf_str = ['RF/2', 'RF/4', 'RF/8', 'Reserved']
81 self.em4100_decode1_partial = 0
82
83 def metadata(self, key, value):
84 if key == srd.SRD_CONF_SAMPLERATE:
85 self.samplerate = value
86 self.field_clock = self.samplerate / self.options['coilfreq']
87 self.wzmax = self.options['w_zero_max'] * self.field_clock
88 self.wzmin = self.options['w_zero_min'] * self.field_clock
89 self.womax = self.options['w_one_max'] * self.field_clock
90 self.womin = self.options['w_one_min'] * self.field_clock
91 self.startgap = self.options['start_gap'] * self.field_clock
92 self.writegap = self.options['w_gap'] * self.field_clock
93 self.nogap = 64 * self.field_clock
94
95 def start(self):
96 self.out_ann = self.register(srd.OUTPUT_ANN)
97
98 def decode_config(self, idx):
99 safer_key = self.bits_pos[idx][0]<<3 | self.bits_pos[idx+1][0]<<2 | \
100 self.bits_pos[idx+2][0]<<1 | self.bits_pos[idx+3][0]
101 self.put(self.bits_pos[idx][1], self.bits_pos[idx+3][2], self.out_ann,
102 [10, ['Safer Key' + ': %X' % safer_key,'%X' % safer_key]])
103 bitrate = self.bits_pos[idx+11][0]<<2 | self.bits_pos[idx+12][0]<<1 | \
104 self.bits_pos[idx+13][0]
105 self.put(self.bits_pos[idx+11][1], self.bits_pos[idx+13][2],
106 self.out_ann, [10, ['Data Bit Rate: ' + \
107 self.br_string[bitrate], self.br_string[bitrate]]])
108 modulation1 = self.bits_pos[idx+15][0]<<1 | self.bits_pos[idx+16][0]
109 modulation2 = self.bits_pos[idx+17][0]<<2 | \
110 self.bits_pos[idx+18][0]<<1 | self.bits_pos[idx+19][0]
111 if modulation1 == 0:
112 mod_string = self.mod_str2[modulation2]
113 else:
114 mod_string = self.mod_str1[modulation1]
115 self.put(self.bits_pos[idx+15][1], self.bits_pos[idx+19][2],
116 self.out_ann, [10, ['Modulation: ' + mod_string, mod_string]])
117 psk_cf = self.bits_pos[idx+20][0]<<1 | self.bits_pos[idx+21][0]
118 self.put(self.bits_pos[idx+20][1], self.bits_pos[idx+21][2],
119 self.out_ann, [10, ['PSK-CF: ' + self.pskcf_str[psk_cf],
120 self.pskcf_str[psk_cf]]])
121 self.put(self.bits_pos[idx+22][1], self.bits_pos[idx+22][2],
122 self.out_ann, [10, ['AOR' + ': %d' % \
123 (self.bits_pos[idx+22][0]),'%d' % (self.bits_pos[idx+22][0])]])
124 maxblock = self.bits_pos[idx+24][0]<<2 | self.bits_pos[idx+25][0]<<1 | \
125 self.bits_pos[idx+26][0]
126 self.put(self.bits_pos[idx+24][1], self.bits_pos[idx+26][2],
127 self.out_ann, [10, ['Max-Block' + ': %d' % maxblock,
128 '%d' % maxblock]])
129 self.put(self.bits_pos[idx+27][1], self.bits_pos[idx+27][2],
130 self.out_ann, [10, ['PWD' + ': %d' % \
131 (self.bits_pos[idx+27][0]),'%d' % (self.bits_pos[idx+27][0])]])
132 self.put(self.bits_pos[idx+28][1], self.bits_pos[idx+28][2],
133 self.out_ann, [10, ['ST-sequence terminator' + ': %d' % \
134 (self.bits_pos[idx+28][0]),'%d' % (self.bits_pos[idx+28][0])]])
135 self.put(self.bits_pos[idx+31][1], self.bits_pos[idx+31][2],
136 self.out_ann, [10, ['POR delay' + ': %d' % \
137 (self.bits_pos[idx+31][0]),'%d' % (self.bits_pos[idx+31][0])]])
138
139 def put4bits(self, idx):
140 bits = self.bits_pos[idx][0]<<3 | self.bits_pos[idx+1][0]<<2 | \
141 self.bits_pos[idx+2][0]<<1 | self.bits_pos[idx+3][0]
142 self.put(self.bits_pos[idx][1], self.bits_pos[idx+3][2], self.out_ann,
143 [10, ['%X' % bits]])
144
145 def em4100_decode1(self, idx):
146 self.put(self.bits_pos[idx][1], self.bits_pos[idx+8][2], self.out_ann,
147 [10, ['EM4100 header', 'EM header', 'Header', 'H']])
148 self.put4bits(idx+9)
149 self.put4bits(idx+14)
150 self.put4bits(idx+19)
151 self.put4bits(idx+24)
152 self.em4100_decode1_partial = self.bits_pos[idx+29][0]<<3 | \
153 self.bits_pos[idx+30][0]<<2 | self.bits_pos[idx+31][0]<<1
154 self.put(self.bits_pos[idx+29][1], self.bits_pos[idx+31][2],
155 self.out_ann, [10, ['Partial nibble']])
156
157 def em4100_decode2(self, idx):
158 if self.em4100_decode1_partial != 0:
159 bits = self.em4100_decode1_partial + self.bits_pos[idx][0]
160 self.put(self.bits_pos[idx][1], self.bits_pos[idx][2],
161 self.out_ann, [10, ['%X' % bits]])
162 self.em4100_decode1_partial = 0
163 else:
164 self.put(self.bits_pos[idx][1], self.bits_pos[idx][2],
165 self.out_ann, [10, ['Partial nibble']])
166
167 self.put4bits(idx+2)
168 self.put4bits(idx+7)
169 self.put4bits(idx+12)
170 self.put4bits(idx+17)
171 self.put4bits(idx+22)
172 self.put(self.bits_pos[idx+27][1], self.bits_pos[idx+31][2],
173 self.out_ann, [10, ['EM4100 trailer']])
174
175 def get_32_bits(self, idx):
176 retval = 0
177 for i in range(0, 32):
178 retval <<= 1
179 retval |= self.bits_pos[i+idx][0]
180 return retval
181
182 def get_3_bits(self, idx):
183 retval = self.bits_pos[idx][0]<<2 | self.bits_pos[idx+1][0]<<1 | \
184 self.bits_pos[idx+2][0]
185 return retval
186
187 def put_fields(self):
188 if (self.bit_nr == 70):
189 self.put(self.bits_pos[0][1], self.bits_pos[1][2], self.out_ann,
190 [5, ['Opcode' + ': %d%d' % (self.bits_pos[0][0],
191 self.bits_pos[1][0]), '%d%d' % (self.bits_pos[0][0],
192 self.bits_pos[1][0])]])
193 password = self.get_32_bits(2)
194 self.put(self.bits_pos[2][1], self.bits_pos[33][2], self.out_ann,
195 [8, ['Password' + ': %X' % password, '%X' % password]])
196 self.put(self.bits_pos[34][1], self.bits_pos[34][2], self.out_ann,
197 [6, ['Lock' + ': %X' % self.bits_pos[34][0],
198 '%X' % self.bits_pos[34][0]]])
199 data = self.get_32_bits(35)
200 self.put(self.bits_pos[35][1], self.bits_pos[66][2], self.out_ann,
201 [7, ['Data' + ': %X' % data, '%X' % data]])
202 addr = self.get_3_bits(67)
203 self.put(self.bits_pos[67][1], self.bits_pos[69][2], self.out_ann,
204 [9, ['Addr' + ': %X' % addr, '%X' % addr]])
205 if addr == 0:
206 self.decode_config(35)
207 if addr == 7:
208 self.put(self.bits_pos[35][1], self.bits_pos[66][2],
209 self.out_ann, [10, ['Password' + ': %X' % data,
210 '%X' % data]])
211 # If we are programming EM4100 data we can decode it halfway.
212 if addr == 1 and self.options['em4100_decode'] == 'on':
213 self.em4100_decode1(35)
214 if addr == 2 and self.options['em4100_decode'] == 'on':
215 self.em4100_decode2(35)
216
217 if (self.bit_nr == 38):
218 self.put(self.bits_pos[0][1], self.bits_pos[1][2], self.out_ann,
219 [5, ['Opcode' + ': %d%d' % (self.bits_pos[0][0],
220 self.bits_pos[1][0]), '%d%d' % (self.bits_pos[0][0],
221 self.bits_pos[1][0])]])
222 self.put(self.bits_pos[2][1], self.bits_pos[2][2], self.out_ann,
223 [6, ['Lock' + ': %X' % self.bits_pos[2][0],
224 '%X' % self.bits_pos[2][0]]])
225 data = self.get_32_bits(3)
226 self.put(self.bits_pos[3][1], self.bits_pos[34][2], self.out_ann,
227 [7, ['Data' + ': %X' % data, '%X' % data]])
228 addr = self.get_3_bits(35)
229 self.put(self.bits_pos[35][1], self.bits_pos[37][2], self.out_ann,
230 [9, ['Addr' + ': %X' % addr, '%X' % addr]])
231 if addr == 0:
232 self.decode_config(3)
233 if addr == 7:
234 self.put(self.bits_pos[3][1], self.bits_pos[34][2],
235 self.out_ann, [10, ['Password' + ': %X' % data,
236 '%X' % data]])
237 # If we are programming EM4100 data we can decode it halfway.
238 if addr == 1 and self.options['em4100_decode'] == 'on':
239 self.em4100_decode1(3)
240 if addr == 2 and self.options['em4100_decode'] == 'on':
241 self.em4100_decode2(3)
242
243 if (self.bit_nr == 2):
244 self.put(self.bits_pos[0][1], self.bits_pos[1][2], self.out_ann,
245 [5, ['Opcode' + ': %d%d' % (self.bits_pos[0][0],
246 self.bits_pos[1][0]), '%d%d' % (self.bits_pos[0][0],
247 self.bits_pos[1][0])]])
248 self.bit_nr = 0
249
250 def add_bits_pos(self, bit, bit_start, bit_end):
251 if self.bit_nr < 70:
252 self.bits_pos[self.bit_nr][0] = bit
253 self.bits_pos[self.bit_nr][1] = bit_start
254 self.bits_pos[self.bit_nr][2] = bit_end
255 self.bit_nr += 1
256
257 def decode(self, ss, es, data):
258 if not self.samplerate:
259 raise SamplerateError('Cannot decode without samplerate.')
260 for (self.samplenum, (pin,)) in data:
261 # Ignore identical samples early on (for performance reasons).
262 if self.oldpin == pin:
263 continue
264
265 if self.oldpin is None:
266 self.oldpin = pin
267 self.last_samplenum = self.samplenum
268 self.lastlast_samplenum = self.samplenum
269 self.last_edge = self.samplenum
270 self.oldpl = 0
271 self.oldpp = 0
272 self.oldsamplenum = 0
273 self.last_bit_pos = 0
274
275 self.old_gap_start = 0
276 self.old_gap_end = 0
277 self.gap_detected = 0
278 self.bit_nr = 0
279 continue
280
281 if self.oldpin != pin:
282 pl = self.samplenum - self.oldsamplenum
283 pp = pin
284 samples = self.samplenum - self.last_samplenum
285
286 if self.state == 'WRITE_GAP':
287 if pl > self.writegap:
288 self.gap_detected = 1
289 self.put(self.last_samplenum, self.samplenum,
290 self.out_ann, [2, ['Write gap']])
291 if (self.last_samplenum-self.old_gap_end) > self.nogap:
292 self.gap_detected = 0
293 self.state = 'START_GAP'
294 self.put(self.old_gap_end, self.last_samplenum,
295 self.out_ann, [3, ['Write mode exit']])
296 self.put_fields()
297
298 if self.state == 'START_GAP':
299 if pl > self.startgap:
300 self.gap_detected = 1
301 self.put(self.last_samplenum, self.samplenum,
302 self.out_ann, [1, ['Start gap']])
303 self.state = 'WRITE_GAP'
304
305 if self.gap_detected == 1:
306 self.gap_detected = 0
307 if (self.last_samplenum - self.old_gap_end) > self.wzmin \
308 and (self.last_samplenum - self.old_gap_end) < self.wzmax:
309 self.put(self.old_gap_end, self.last_samplenum,
310 self.out_ann, [0, ['0']])
311 self.put(self.old_gap_end, self.last_samplenum,
312 self.out_ann, [4, ['Bit']])
313 self.add_bits_pos(0, self.old_gap_end,
314 self.last_samplenum)
315 if (self.last_samplenum - self.old_gap_end) > self.womin \
316 and (self.last_samplenum - self.old_gap_end) < self.womax:
317 self.put(self.old_gap_end, self.last_samplenum,
318 self.out_ann, [0, ['1']])
319 self.put(self.old_gap_end, self.last_samplenum,
320 self.out_ann, [4, ['Bit']])
321 self.add_bits_pos(1, self.old_gap_end, self.last_samplenum)
322
323 self.old_gap_start = self.last_samplenum
324 self.old_gap_end = self.samplenum
325
326 self.oldpl = pl
327 self.oldpp = pp
328 self.oldsamplenum = self.samplenum
329 self.last_samplenum = self.samplenum
330 self.oldpin = pin
Protocol decoder lib