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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2016 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 version 2 of the License, or | |
9 | ## (at your option) any later version. | |
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, see <http://www.gnu.org/licenses/>. | |
18 | ## | |
19 | ||
20 | import sigrokdecode as srd | |
21 | ||
22 | class SamplerateError(Exception): | |
23 | pass | |
24 | ||
25 | class Decoder(srd.Decoder): | |
26 | api_version = 3 | |
27 | id = 'em4305' | |
28 | name = 'EM4305' | |
29 | longname = 'RFID EM4205/EM4305' | |
30 | desc = 'EM4205/EM4305 100-150kHz RFID protocol.' | |
31 | license = 'gplv2+' | |
32 | inputs = ['logic'] | |
33 | outputs = ['em4305'] | |
34 | channels = ( | |
35 | {'id': 'data', 'name': 'Data', 'desc': 'Data line'}, | |
36 | ) | |
37 | options = ( | |
38 | {'id': 'coilfreq', 'desc': 'Coil frequency', 'default': 125000}, | |
39 | {'id': 'first_field_stop', 'desc': 'First field stop min', 'default': 40}, | |
40 | {'id': 'w_gap', 'desc': 'Write gap min', 'default': 12}, | |
41 | {'id': 'w_one_max', 'desc': 'Write one max', 'default': 32}, | |
42 | {'id': 'w_zero_on_min', 'desc': 'Write zero on min', 'default': 15}, | |
43 | {'id': 'w_zero_off_max', 'desc': 'Write zero off max', 'default': 27}, | |
44 | {'id': 'em4100_decode', 'desc': 'EM4100 decode', 'default': 'on', | |
45 | 'values': ('on', 'off')}, | |
46 | ) | |
47 | annotations = ( | |
48 | ('bit_value', 'Bit value'), | |
49 | ('first_field_stop', 'First field stop'), | |
50 | ('write_gap', 'Write gap'), | |
51 | ('write_mode_exit', 'Write mode exit'), | |
52 | ('bit', 'Bit'), | |
53 | ('opcode', 'Opcode'), | |
54 | ('lock', 'Lock'), | |
55 | ('data', 'Data'), | |
56 | ('password', 'Password'), | |
57 | ('address', 'Address'), | |
58 | ('bitrate', 'Bitrate'), | |
59 | ) | |
60 | annotation_rows = ( | |
61 | ('bits', 'Bits', (0,)), | |
62 | ('structure', 'Structure', (1, 2, 3, 4)), | |
63 | ('fields', 'Fields', (5, 6, 7, 8, 9)), | |
64 | ('decode', 'Decode', (10,)), | |
65 | ) | |
66 | ||
67 | def __init__(self): | |
68 | self.samplerate = None | |
69 | self.last_samplenum = None | |
70 | self.state = 'FFS_SEARCH' | |
71 | self.bits_pos = [[0 for col in range(3)] for row in range(70)] | |
72 | self.br_string = ['RF/8', 'RF/16', 'Unused', 'RF/32', 'RF/40', | |
73 | 'Unused', 'Unused', 'RF/64',] | |
74 | self.encoder = ['not used', 'Manchester', 'Bi-phase', 'not used'] | |
75 | self.delayed_on = ['No delay', 'Delayed on - BP/8', 'Delayed on - BP/4', 'No delay'] | |
76 | self.em4100_decode1_partial = 0 | |
77 | self.cmds = ['Invalid', 'Login', 'Write word', 'Invalid', 'Read word', 'Disable', 'Protect', 'Invalid'] | |
78 | ||
79 | def metadata(self, key, value): | |
80 | if key == srd.SRD_CONF_SAMPLERATE: | |
81 | self.samplerate = value | |
82 | self.field_clock = self.samplerate / self.options['coilfreq'] | |
83 | self.wzmax = self.options['w_zero_off_max'] * self.field_clock | |
84 | self.wzmin = self.options['w_zero_on_min'] * self.field_clock | |
85 | self.womax = self.options['w_one_max'] * self.field_clock | |
86 | self.ffs = self.options['first_field_stop'] * self.field_clock | |
87 | self.writegap = self.options['w_gap'] * self.field_clock | |
88 | self.nogap = 300 * self.field_clock | |
89 | ||
90 | def start(self): | |
91 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
92 | ||
93 | def decode_config(self, idx): | |
94 | bitrate = self.get_3_bits(idx+2) | |
95 | self.put(self.bits_pos[idx][1], self.bits_pos[idx+5][2], | |
96 | self.out_ann, [10, ['Data rate: ' + \ | |
97 | self.br_string[bitrate], self.br_string[bitrate]]]) | |
98 | encoding = self.bits_pos[idx+6][0]<<0 | self.bits_pos[idx+7][0]<<1 | |
99 | self.put(self.bits_pos[idx+6][1], self.bits_pos[idx+10][2], | |
100 | self.out_ann, [10, ['Encoder: ' + \ | |
101 | self.encoder[encoding], self.encoder[encoding]]]) | |
102 | self.put(self.bits_pos[idx+11][1], self.bits_pos[idx+12][2], self.out_ann, | |
103 | [10, ['Zero bits', 'ZB']]) | |
104 | delay_on = self.bits_pos[idx+13][0]<<0 | self.bits_pos[idx+14][0]<<1 | |
105 | self.put(self.bits_pos[idx+13][1], self.bits_pos[idx+14][2], | |
106 | self.out_ann, [10, ['Delayed on: ' + \ | |
107 | self.delayed_on[delay_on], self.delayed_on[delay_on]]]) | |
108 | lwr = self.bits_pos[idx+15][0]<<3 | self.bits_pos[idx+16][0]<<2 | \ | |
109 | self.bits_pos[idx+18][0]<<1 | self.bits_pos[idx+19][0]<<0 | |
110 | self.put(self.bits_pos[idx+15][1], self.bits_pos[idx+19][2], | |
111 | self.out_ann, [10, ['Last default read word: %d' % lwr, 'LWR: %d' % lwr, '%d' % lwr]]) | |
112 | self.put(self.bits_pos[idx+20][1], self.bits_pos[idx+20][2], | |
113 | self.out_ann, [10, ['Read login: %d' % self.bits_pos[idx+20][0], '%d' % self.bits_pos[idx+20][0]]]) | |
114 | self.put(self.bits_pos[idx+21][1], self.bits_pos[idx+21][2], self.out_ann, | |
115 | [10, ['Zero bits', 'ZB']]) | |
116 | self.put(self.bits_pos[idx+22][1], self.bits_pos[idx+22][2], | |
117 | self.out_ann, [10, ['Write login: %d' % self.bits_pos[idx+22][0], '%d' % self.bits_pos[idx+22][0]]]) | |
118 | self.put(self.bits_pos[idx+23][1], self.bits_pos[idx+24][2], self.out_ann, | |
119 | [10, ['Zero bits', 'ZB']]) | |
120 | self.put(self.bits_pos[idx+25][1], self.bits_pos[idx+25][2], | |
121 | self.out_ann, [10, ['Disable: %d' % self.bits_pos[idx+25][0], '%d' % self.bits_pos[idx+25][0]]]) | |
122 | self.put(self.bits_pos[idx+27][1], self.bits_pos[idx+27][2], | |
123 | self.out_ann, [10, ['Reader talk first: %d' % self.bits_pos[idx+27][0], 'RTF: %d' % self.bits_pos[idx+27][0]]]) | |
124 | self.put(self.bits_pos[idx+28][1], self.bits_pos[idx+28][2], self.out_ann, | |
125 | [10, ['Zero bits', 'ZB']]) | |
126 | self.put(self.bits_pos[idx+29][1], self.bits_pos[idx+29][2], | |
127 | self.out_ann, [10, ['Pigeon mode: %d' % self.bits_pos[idx+29][0], '%d' % self.bits_pos[idx+29][0]]]) | |
128 | self.put(self.bits_pos[idx+30][1], self.bits_pos[idx+34][2], | |
129 | self.out_ann, [10, ['Reserved', 'Res', 'R']]) | |
130 | ||
131 | def put4bits(self, idx): | |
132 | bits = self.bits_pos[idx][0]<<3 | self.bits_pos[idx+1][0]<<2 | \ | |
133 | self.bits_pos[idx+2][0]<<1 | self.bits_pos[idx+3][0] | |
134 | self.put(self.bits_pos[idx][1], self.bits_pos[idx+3][2], self.out_ann, | |
135 | [10, ['%X' % bits]]) | |
136 | ||
137 | def em4100_decode1(self, idx): | |
138 | self.put(self.bits_pos[idx][1], self.bits_pos[idx+9][2], self.out_ann, | |
139 | [10, ['EM4100 header', 'EM header', 'Header', 'H']]) | |
140 | self.put4bits(idx+10) | |
141 | bits = self.bits_pos[idx+15][0]<<3 | self.bits_pos[idx+16][0]<<2 | \ | |
142 | self.bits_pos[idx+18][0]<<1 | self.bits_pos[idx+19][0]<<0 | |
143 | self.put(self.bits_pos[idx+15][1], self.bits_pos[idx+19][2], self.out_ann, | |
144 | [10, ['%X' % bits]]) | |
145 | self.put4bits(idx+21) | |
146 | self.put4bits(idx+27) | |
147 | self.em4100_decode1_partial = self.bits_pos[idx+32][0]<<3 | \ | |
148 | self.bits_pos[idx+33][0]<<2 | self.bits_pos[idx+34][0]<<1 | |
149 | self.put(self.bits_pos[idx+32][1], self.bits_pos[idx+34][2], | |
150 | self.out_ann, [10, ['Partial nibble']]) | |
151 | ||
152 | def em4100_decode2(self, idx): | |
153 | if self.em4100_decode1_partial != 0: | |
154 | bits = self.em4100_decode1_partial + self.bits_pos[idx][0] | |
155 | self.put(self.bits_pos[idx][1], self.bits_pos[idx][2], | |
156 | self.out_ann, [10, ['%X' % bits]]) | |
157 | self.em4100_decode1_partial = 0 | |
158 | else: | |
159 | self.put(self.bits_pos[idx][1], self.bits_pos[idx][2], | |
160 | self.out_ann, [10, ['Partial nibble']]) | |
161 | ||
162 | self.put4bits(idx+2) | |
163 | bits = self.bits_pos[idx+7][0]<<3 | self.bits_pos[idx+9][0]<<2 | \ | |
164 | self.bits_pos[idx+10][0]<<1 | self.bits_pos[idx+11][0]<<0 | |
165 | self.put(self.bits_pos[idx+7][1], self.bits_pos[idx+11][2], self.out_ann, | |
166 | [10, ['%X' % bits]]) | |
167 | self.put4bits(idx+13) | |
168 | self.put4bits(idx+19) | |
169 | bits = self.bits_pos[idx+24][0]<<3 | self.bits_pos[idx+25][0]<<2 | \ | |
170 | self.bits_pos[idx+27][0]<<1 | self.bits_pos[idx+28][0]<<0 | |
171 | self.put(self.bits_pos[idx+24][1], self.bits_pos[idx+28][2], self.out_ann, | |
172 | [10, ['%X' % bits]]) | |
173 | self.put(self.bits_pos[idx+30][1], self.bits_pos[idx+34][2], | |
174 | self.out_ann, [10, ['EM4100 trailer']]) | |
175 | ||
176 | def get_32_bits(self, idx): | |
177 | return self.get_8_bits(idx+27)<<24 | self.get_8_bits(idx+18)<<16 | \ | |
178 | self.get_8_bits(idx+9)<<8 | self.get_8_bits(idx) | |
179 | ||
180 | def get_8_bits(self, idx): | |
181 | retval = 0 | |
182 | for i in range(0, 8): | |
183 | retval <<= 1 | |
184 | retval |= self.bits_pos[i+idx][0] | |
185 | return retval | |
186 | ||
187 | def get_3_bits(self, idx): | |
188 | return self.bits_pos[idx][0]<<2 | self.bits_pos[idx+1][0]<<1 | \ | |
189 | self.bits_pos[idx+2][0] | |
190 | ||
191 | def get_4_bits(self, idx): | |
192 | return self.bits_pos[idx][0]<<0 | self.bits_pos[idx+1][0]<<1 | \ | |
193 | self.bits_pos[idx+2][0]<<2 | self.bits_pos[idx+3][0]<<3 | |
194 | ||
195 | def print_row_parity(self, idx, length): | |
196 | parity = 0 | |
197 | for i in range(0, length): | |
198 | parity += self.bits_pos[i+idx][0] | |
199 | parity = parity & 0x1 | |
200 | if parity == self.bits_pos[idx+length][0]: | |
201 | self.put(self.bits_pos[idx+length][1], self.bits_pos[idx+length][2], self.out_ann, | |
202 | [5, ['Row parity OK', 'Parity OK', 'OK']]) | |
203 | else: | |
204 | self.put(self.bits_pos[idx+length][1], self.bits_pos[idx+length][2], self.out_ann, | |
205 | [5, ['Row parity failed', 'Parity failed', 'Fail']]) | |
206 | ||
207 | def print_col_parity(self, idx): | |
208 | data_1 = self.get_8_bits(idx) | |
209 | data_2 = self.get_8_bits(idx+9) | |
210 | data_3 = self.get_8_bits(idx+9+9) | |
211 | data_4 = self.get_8_bits(idx+9+9+9) | |
212 | col_par = self.get_8_bits(idx+9+9+9+9) | |
213 | col_par_calc = data_1^data_2^data_3^data_4 | |
214 | ||
215 | if col_par == col_par_calc: | |
216 | self.put(self.bits_pos[idx+9+9+9+9][1], self.bits_pos[idx+9+9+9+9+7][2], self.out_ann, | |
217 | [5, ['Column parity OK', 'Parity OK', 'OK']]) | |
218 | else: | |
219 | self.put(self.bits_pos[idx+9+9+9+9][1], self.bits_pos[idx+9+9+9+9+7][2], self.out_ann, | |
220 | [5, ['Column parity failed', 'Parity failed', 'Fail']]) | |
221 | ||
222 | def print_8bit_data(self, idx): | |
223 | data = self.get_8_bits(idx) | |
224 | self.put(self.bits_pos[idx][1], self.bits_pos[idx+7][2], self.out_ann, | |
225 | [9, ['Data' + ': %X' % data, '%X' % data]]) | |
226 | ||
227 | def put_fields(self): | |
228 | if self.bit_nr == 50: | |
229 | self.put(self.bits_pos[0][1], self.bits_pos[0][2], self.out_ann, | |
230 | [4, ['Logic zero']]) | |
231 | self.put(self.bits_pos[1][1], self.bits_pos[4][2], self.out_ann, | |
232 | [4, ['Command', 'Cmd', 'C']]) | |
233 | self.put(self.bits_pos[5][1], self.bits_pos[49][2], self.out_ann, | |
234 | [4, ['Password', 'Passwd', 'Pass', 'P']]) | |
235 | # Get command. | |
236 | cmd = self.get_3_bits(1) | |
237 | self.put(self.bits_pos[1][1], self.bits_pos[3][2], self.out_ann, | |
238 | [5, [self.cmds[cmd]]]) | |
239 | self.print_row_parity(1, 3) | |
240 | ||
241 | # Print data. | |
242 | self.print_8bit_data(5) | |
243 | self.print_row_parity(5, 8) | |
244 | self.print_8bit_data(14) | |
245 | self.print_row_parity(14, 8) | |
246 | self.print_8bit_data(23) | |
247 | self.print_row_parity(23, 8) | |
248 | self.print_8bit_data(32) | |
249 | self.print_row_parity(32, 8) | |
250 | self.print_col_parity(5) | |
251 | if self.bits_pos[49][0] == 0: | |
252 | self.put(self.bits_pos[49][1], self.bits_pos[49][2], self.out_ann, | |
253 | [5, ['Stop bit', 'Stop', 'SB']]) | |
254 | else: | |
255 | self.put(self.bits_pos[49][1], self.bits_pos[49][2], self.out_ann, | |
256 | [5, ['Stop bit error', 'Error']]) | |
257 | ||
258 | if cmd == 1: | |
259 | password = self.get_32_bits(5) | |
260 | self.put(self.bits_pos[12][1], self.bits_pos[46][2], self.out_ann, | |
261 | [10, ['Login password: %X' % password]]) | |
262 | ||
263 | if self.bit_nr == 57: | |
264 | self.put(self.bits_pos[0][1], self.bits_pos[0][2], self.out_ann, | |
265 | [4, ['Logic zero', 'LZ']]) | |
266 | self.put(self.bits_pos[1][1], self.bits_pos[4][2], self.out_ann, | |
267 | [4, ['Command', 'Cmd', 'C']]) | |
268 | self.put(self.bits_pos[5][1], self.bits_pos[11][2], self.out_ann, | |
269 | [4, ['Address', 'Addr', 'A']]) | |
270 | self.put(self.bits_pos[12][1], self.bits_pos[56][2], self.out_ann, | |
271 | [4, ['Data', 'Da', 'D']]) | |
272 | ||
273 | # Get command. | |
274 | cmd = self.get_3_bits(1) | |
275 | self.put(self.bits_pos[1][1], self.bits_pos[3][2], self.out_ann, | |
276 | [5, [self.cmds[cmd]]]) | |
277 | self.print_row_parity(1, 3) | |
278 | ||
279 | # Get address. | |
280 | addr = self.get_4_bits(5) | |
281 | self.put(self.bits_pos[5][1], self.bits_pos[8][2], self.out_ann, | |
282 | [9, ['Addr' + ': %d' % addr, '%d' % addr]]) | |
283 | self.put(self.bits_pos[9][1], self.bits_pos[10][2], self.out_ann, | |
284 | [5, ['Zero bits', 'ZB']]) | |
285 | self.print_row_parity(5, 6) | |
286 | # Print data. | |
287 | self.print_8bit_data(12) | |
288 | self.print_row_parity(12, 8) | |
289 | self.print_8bit_data(21) | |
290 | self.print_row_parity(21, 8) | |
291 | self.print_8bit_data(30) | |
292 | self.print_row_parity(30, 8) | |
293 | self.print_8bit_data(39) | |
294 | self.print_row_parity(39, 8) | |
295 | self.print_col_parity(12) | |
296 | if self.bits_pos[56][0] == 0: | |
297 | self.put(self.bits_pos[56][1], self.bits_pos[56][2], self.out_ann, | |
298 | [5, ['Stop bit', 'Stop', 'SB']]) | |
299 | else: | |
300 | self.put(self.bits_pos[56][1], self.bits_pos[56][2], self.out_ann, | |
301 | [5, ['Stop bit error', 'Error']]) | |
302 | ||
303 | if addr == 4: | |
304 | self.decode_config(12) | |
305 | ||
306 | if addr == 2: | |
307 | password = self.get_32_bits(12) | |
308 | self.put(self.bits_pos[12][1], self.bits_pos[46][2], self.out_ann, | |
309 | [10, ['Write password: %X' % password]]) | |
310 | ||
311 | # If we are programming EM4100 data we can decode it halfway. | |
312 | if addr == 5 and self.options['em4100_decode'] == 'on': | |
313 | self.em4100_decode1(12) | |
314 | if addr == 6 and self.options['em4100_decode'] == 'on': | |
315 | self.em4100_decode2(12) | |
316 | ||
317 | self.bit_nr = 0 | |
318 | ||
319 | def add_bits_pos(self, bit, ss_bit, es_bit): | |
320 | if self.bit_nr < 70: | |
321 | self.bits_pos[self.bit_nr][0] = bit | |
322 | self.bits_pos[self.bit_nr][1] = ss_bit | |
323 | self.bits_pos[self.bit_nr][2] = es_bit | |
324 | self.bit_nr += 1 | |
325 | ||
326 | def decode(self): | |
327 | if not self.samplerate: | |
328 | raise SamplerateError('Cannot decode without samplerate.') | |
329 | ||
330 | # Initialize internal state. | |
331 | self.last_samplenum = self.samplenum | |
332 | self.oldsamplenum = 0 | |
333 | self.old_gap_end = 0 | |
334 | self.gap_detected = 0 | |
335 | self.bit_nr = 0 | |
336 | ||
337 | while True: | |
338 | # Ignore identical samples, only process edges. | |
339 | (pin,) = self.wait({0: 'e'}) | |
340 | ||
341 | pl = self.samplenum - self.oldsamplenum | |
342 | pp = pin | |
343 | samples = self.samplenum - self.last_samplenum | |
344 | ||
345 | if self.state == 'FFS_DETECTED': | |
346 | if pl > self.writegap: | |
347 | self.gap_detected = 1 | |
348 | if (self.last_samplenum - self.old_gap_end) > self.nogap: | |
349 | self.gap_detected = 0 | |
350 | self.state = 'FFS_SEARCH' | |
351 | self.put(self.old_gap_end, self.last_samplenum, | |
352 | self.out_ann, [3, ['Write mode exit']]) | |
353 | self.put_fields() | |
354 | ||
355 | if self.state == 'FFS_SEARCH': | |
356 | if pl > self.ffs: | |
357 | self.gap_detected = 1 | |
358 | self.put(self.last_samplenum, self.samplenum, | |
359 | self.out_ann, [1, ['First field stop', 'Field stop', 'FFS']]) | |
360 | self.state = 'FFS_DETECTED' | |
361 | ||
362 | if self.gap_detected == 1: | |
363 | self.gap_detected = 0 | |
364 | if (self.last_samplenum - self.old_gap_end) > self.wzmin \ | |
365 | and (self.last_samplenum - self.old_gap_end) < self.wzmax: | |
366 | self.put(self.old_gap_end, self.samplenum, | |
367 | self.out_ann, [0, ['0']]) | |
368 | self.add_bits_pos(0, self.old_gap_end, self.samplenum) | |
369 | if (self.last_samplenum - self.old_gap_end) > self.womax \ | |
370 | and (self.last_samplenum-self.old_gap_end) < self.nogap: | |
371 | # One or more 1 bits | |
372 | one_bits = (int)((self.last_samplenum - self.old_gap_end) / self.womax) | |
373 | for ox in range(0, one_bits): | |
374 | bs = (int)(self.old_gap_end+ox*self.womax) | |
375 | be = (int)(self.old_gap_end+ox*self.womax + self.womax) | |
376 | self.put(bs, be, self.out_ann, [0, ['1']]) | |
377 | self.add_bits_pos(1, bs, be) | |
378 | if (self.samplenum - self.last_samplenum) > self.wzmin \ | |
379 | and (self.samplenum - self.last_samplenum) < self.wzmax: | |
380 | bs = (int)(self.old_gap_end+one_bits*self.womax) | |
381 | self.put(bs, self.samplenum, self.out_ann, [0, ['0']]) | |
382 | self.add_bits_pos(0, bs, self.samplenum) | |
383 | ||
384 | self.old_gap_end = self.samplenum | |
385 | ||
386 | if self.state == 'SKIP': | |
387 | self.state = 'FFS_SEARCH' | |
388 | ||
389 | self.oldsamplenum = self.samplenum | |
390 | self.last_samplenum = self.samplenum |