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2b0915c1 | 1 | ## |
50bd5d25 | 2 | ## This file is part of the libsigrokdecode project. |
2b0915c1 | 3 | ## |
09bca511 | 4 | ## Copyright (C) 2012-2013 Uwe Hermann <uwe@hermann-uwe.de> |
2b0915c1 UH |
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, write to the Free Software | |
18 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | ## | |
20 | ||
2b0915c1 | 21 | # DCF77 protocol decoder |
2b0915c1 UH |
22 | |
23 | import sigrokdecode as srd | |
24 | import calendar | |
25 | ||
2b0915c1 UH |
26 | # Return the specified BCD number (max. 8 bits) as integer. |
27 | def bcd2int(b): | |
28 | return (b & 0x0f) + ((b >> 4) * 10) | |
29 | ||
30 | class Decoder(srd.Decoder): | |
a2c2afd9 | 31 | api_version = 1 |
2b0915c1 UH |
32 | id = 'dcf77' |
33 | name = 'DCF77' | |
3d3da57d | 34 | longname = 'DCF77 time protocol' |
a465436e | 35 | desc = 'European longwave time signal (77.5kHz carrier signal).' |
2b0915c1 UH |
36 | license = 'gplv2+' |
37 | inputs = ['logic'] | |
38 | outputs = ['dcf77'] | |
39 | probes = [ | |
40 | {'id': 'data', 'name': 'DATA', 'desc': 'DATA line'}, | |
41 | ] | |
54f1b2b7 | 42 | optional_probes = [] |
2b0915c1 UH |
43 | options = {} |
44 | annotations = [ | |
8a18c4e7 UH |
45 | ['start_of_minute', 'Start of minute'], |
46 | ['special_bits', 'Special bits (civil warnings, weather forecast)'], | |
47 | ['call_bit', 'Call bit'], | |
48 | ['summer_time', 'Summer time announcement'], | |
49 | ['cest', 'CEST bit'], | |
50 | ['cet', 'CET bit'], | |
51 | ['leap_second', 'Leap second bit'], | |
52 | ['start_of_time', 'Start of encoded time'], | |
53 | ['minute', 'Minute'], | |
54 | ['minute_parity', 'Minute parity bit'], | |
55 | ['hour', 'Hour'], | |
56 | ['hour_parity', 'Hour parity bit'], | |
57 | ['day', 'Day of month'], | |
58 | ['day_of_week', 'Day of week'], | |
59 | ['month', 'Month'], | |
60 | ['year', 'Year'], | |
61 | ['date_parity', 'Date parity bit'], | |
62 | ['raw_bits', 'Raw bits'], | |
63 | ['unknown_bits', 'Unknown bits'], | |
64 | ['warnings', 'Human-readable warnings'], | |
2b0915c1 UH |
65 | ] |
66 | ||
67 | def __init__(self, **kwargs): | |
2b716038 | 68 | self.state = 'WAIT FOR RISING EDGE' |
2fcd7c22 | 69 | self.oldpins = None |
2b0915c1 UH |
70 | self.oldval = None |
71 | self.samplenum = 0 | |
3e9b87f7 | 72 | self.ss_bit = self.ss_bit_old = self.es_bit = self.ss_block = 0 |
2b0915c1 UH |
73 | self.bitcount = 0 # Counter for the DCF77 bits (0..58) |
74 | self.dcf77_bitnumber_is_known = 0 | |
75 | ||
76 | def start(self, metadata): | |
77 | self.samplerate = metadata['samplerate'] | |
78 | # self.out_proto = self.add(srd.OUTPUT_PROTO, 'dcf77') | |
79 | self.out_ann = self.add(srd.OUTPUT_ANN, 'dcf77') | |
80 | ||
81 | def report(self): | |
82 | pass | |
83 | ||
09bca511 | 84 | def putx(self, data): |
3e9b87f7 | 85 | # Annotation for a single DCF77 bit. |
aa4cf4c6 | 86 | self.put(self.ss_bit, self.es_bit, self.out_ann, data) |
09bca511 | 87 | |
3e9b87f7 UH |
88 | def putb(self, data): |
89 | # Annotation for a multi-bit DCF77 field. | |
90 | self.put(self.ss_block, self.samplenum, self.out_ann, data) | |
91 | ||
2b0915c1 UH |
92 | # TODO: Which range to use? Only the 100ms/200ms or full second? |
93 | def handle_dcf77_bit(self, bit): | |
94 | c = self.bitcount | |
2b0915c1 UH |
95 | |
96 | # Create one annotation for each DCF77 bit (containing the 0/1 value). | |
97 | # Use 'Unknown DCF77 bit x: val' if we're not sure yet which of the | |
98 | # 0..58 bits it is (because we haven't seen a 'new minute' marker yet). | |
99 | # Otherwise, use 'DCF77 bit x: val'. | |
100 | s = '' if self.dcf77_bitnumber_is_known else 'Unknown ' | |
8a18c4e7 | 101 | self.putx([18, ['%sDCF77 bit %d: %d' % (s, c, bit)]]) |
2b0915c1 UH |
102 | |
103 | # If we're not sure yet which of the 0..58 DCF77 bits we have, return. | |
104 | # We don't want to decode bogus data. | |
105 | if not self.dcf77_bitnumber_is_known: | |
106 | return | |
107 | ||
108 | # Output specific "decoded" annotations for the respective DCF77 bits. | |
109 | if c == 0: | |
110 | # Start of minute: DCF bit 0. | |
111 | if bit == 0: | |
09bca511 | 112 | self.putx([0, ['Start of minute (always 0)']]) |
2b0915c1 | 113 | else: |
8a18c4e7 | 114 | self.putx([19, ['Start of minute != 0']]) |
2b0915c1 UH |
115 | elif c in range(1, 14 + 1): |
116 | # Special bits (civil warnings, weather forecast): DCF77 bits 1-14. | |
117 | if c == 1: | |
118 | self.tmp = bit | |
3e9b87f7 | 119 | self.ss_block = self.ss_bit |
2b0915c1 UH |
120 | else: |
121 | self.tmp |= (bit << (c - 1)) | |
122 | if c == 14: | |
3e9b87f7 | 123 | self.putb([1, ['Special bits: %s' % bin(self.tmp)]]) |
2b0915c1 UH |
124 | elif c == 15: |
125 | s = '' if (bit == 1) else 'not ' | |
8a18c4e7 | 126 | self.putx([2, ['Call bit is %sset' % s]]) |
2b0915c1 UH |
127 | # TODO: Previously this bit indicated use of the backup antenna. |
128 | elif c == 16: | |
129 | s = '' if (bit == 1) else 'not ' | |
8a18c4e7 | 130 | self.putx([3, ['Summer time announcement %sactive' % s]]) |
2b0915c1 UH |
131 | elif c == 17: |
132 | s = '' if (bit == 1) else 'not ' | |
8a18c4e7 | 133 | self.putx([4, ['CEST is %sin effect' % s]]) |
2b0915c1 UH |
134 | elif c == 18: |
135 | s = '' if (bit == 1) else 'not ' | |
8a18c4e7 | 136 | self.putx([5, ['CET is %sin effect' % s]]) |
2b0915c1 UH |
137 | elif c == 19: |
138 | s = '' if (bit == 1) else 'not ' | |
8a18c4e7 | 139 | self.putx([6, ['Leap second announcement %sactive' % s]]) |
2b0915c1 UH |
140 | elif c == 20: |
141 | # Start of encoded time: DCF bit 20. | |
142 | if bit == 1: | |
8a18c4e7 | 143 | self.putx([7, ['Start of encoded time (always 1)']]) |
2b0915c1 | 144 | else: |
8a18c4e7 | 145 | self.putx([19, ['ERROR: Start of encoded time != 1']]) |
2b0915c1 UH |
146 | elif c in range(21, 27 + 1): |
147 | # Minutes (0-59): DCF77 bits 21-27 (BCD format). | |
148 | if c == 21: | |
149 | self.tmp = bit | |
3e9b87f7 | 150 | self.ss_block = self.ss_bit |
2b0915c1 UH |
151 | else: |
152 | self.tmp |= (bit << (c - 21)) | |
153 | if c == 27: | |
3e9b87f7 | 154 | self.putb([8, ['Minutes: %d' % bcd2int(self.tmp)]]) |
2b0915c1 UH |
155 | elif c == 28: |
156 | # Even parity over minute bits (21-28): DCF77 bit 28. | |
157 | self.tmp |= (bit << (c - 21)) | |
158 | parity = bin(self.tmp).count('1') | |
159 | s = 'OK' if ((parity % 2) == 0) else 'INVALID!' | |
8a18c4e7 | 160 | self.putx([9, ['Minute parity: %s' % s]]) |
2b0915c1 UH |
161 | elif c in range(29, 34 + 1): |
162 | # Hours (0-23): DCF77 bits 29-34 (BCD format). | |
163 | if c == 29: | |
164 | self.tmp = bit | |
3e9b87f7 | 165 | self.ss_block = self.ss_bit |
2b0915c1 UH |
166 | else: |
167 | self.tmp |= (bit << (c - 29)) | |
168 | if c == 34: | |
3e9b87f7 | 169 | self.putb([10, ['Hours: %d' % bcd2int(self.tmp)]]) |
2b0915c1 UH |
170 | elif c == 35: |
171 | # Even parity over hour bits (29-35): DCF77 bit 35. | |
172 | self.tmp |= (bit << (c - 29)) | |
173 | parity = bin(self.tmp).count('1') | |
174 | s = 'OK' if ((parity % 2) == 0) else 'INVALID!' | |
8a18c4e7 | 175 | self.putx([11, ['Hour parity: %s' % s]]) |
2b0915c1 UH |
176 | elif c in range(36, 41 + 1): |
177 | # Day of month (1-31): DCF77 bits 36-41 (BCD format). | |
178 | if c == 36: | |
179 | self.tmp = bit | |
3e9b87f7 | 180 | self.ss_block = self.ss_bit |
2b0915c1 UH |
181 | else: |
182 | self.tmp |= (bit << (c - 36)) | |
183 | if c == 41: | |
3e9b87f7 | 184 | self.putb([12, ['Day: %d' % bcd2int(self.tmp)]]) |
2b0915c1 UH |
185 | elif c in range(42, 44 + 1): |
186 | # Day of week (1-7): DCF77 bits 42-44 (BCD format). | |
187 | # A value of 1 means Monday, 7 means Sunday. | |
188 | if c == 42: | |
189 | self.tmp = bit | |
3e9b87f7 | 190 | self.ss_block = self.ss_bit |
2b0915c1 UH |
191 | else: |
192 | self.tmp |= (bit << (c - 42)) | |
193 | if c == 44: | |
194 | d = bcd2int(self.tmp) | |
195 | dn = calendar.day_name[d - 1] # day_name[0] == Monday | |
3e9b87f7 | 196 | self.putb([13, ['Day of week: %d (%s)' % (d, dn)]]) |
2b0915c1 UH |
197 | elif c in range(45, 49 + 1): |
198 | # Month (1-12): DCF77 bits 45-49 (BCD format). | |
199 | if c == 45: | |
200 | self.tmp = bit | |
3e9b87f7 | 201 | self.ss_block = self.ss_bit |
2b0915c1 UH |
202 | else: |
203 | self.tmp |= (bit << (c - 45)) | |
204 | if c == 49: | |
205 | m = bcd2int(self.tmp) | |
206 | mn = calendar.month_name[m] # month_name[1] == January | |
8a18c4e7 | 207 | self.putx([14, ['Month: %d (%s)' % (m, mn)]]) |
2b0915c1 UH |
208 | elif c in range(50, 57 + 1): |
209 | # Year (0-99): DCF77 bits 50-57 (BCD format). | |
210 | if c == 50: | |
211 | self.tmp = bit | |
3e9b87f7 | 212 | self.ss_block = self.ss_bit |
2b0915c1 UH |
213 | else: |
214 | self.tmp |= (bit << (c - 50)) | |
215 | if c == 57: | |
3e9b87f7 | 216 | self.putb([15, ['Year: %d' % bcd2int(self.tmp)]]) |
2b0915c1 UH |
217 | elif c == 58: |
218 | # Even parity over date bits (36-58): DCF77 bit 58. | |
219 | self.tmp |= (bit << (c - 50)) | |
220 | parity = bin(self.tmp).count('1') | |
221 | s = 'OK' if ((parity % 2) == 0) else 'INVALID!' | |
8a18c4e7 | 222 | self.putx([16, ['Date parity: %s' % s]]) |
2b0915c1 UH |
223 | else: |
224 | raise Exception('Invalid DCF77 bit: %d' % c) | |
225 | ||
226 | def decode(self, ss, es, data): | |
2fcd7c22 UH |
227 | for (self.samplenum, pins) in data: |
228 | ||
229 | # Ignore identical samples early on (for performance reasons). | |
230 | if self.oldpins == pins: | |
231 | continue | |
54f1b2b7 | 232 | self.oldpins, (val,) = pins, pins |
2b0915c1 | 233 | |
2b716038 | 234 | if self.state == 'WAIT FOR RISING EDGE': |
2b0915c1 UH |
235 | # Wait until the next rising edge occurs. |
236 | if not (self.oldval == 0 and val == 1): | |
237 | self.oldval = val | |
238 | continue | |
239 | ||
240 | # Save the sample number where the DCF77 bit begins. | |
aa4cf4c6 | 241 | self.ss_bit = self.samplenum |
2b0915c1 UH |
242 | |
243 | # Calculate the length (in ms) between two rising edges. | |
aa4cf4c6 | 244 | len_edges = self.ss_bit - self.ss_bit_old |
2b0915c1 UH |
245 | len_edges_ms = int((len_edges / self.samplerate) * 1000) |
246 | ||
247 | # The time between two rising edges is usually around 1000ms. | |
248 | # For DCF77 bit 59, there is no rising edge at all, i.e. the | |
249 | # time between DCF77 bit 59 and DCF77 bit 0 (of the next | |
250 | # minute) is around 2000ms. Thus, if we see an edge with a | |
251 | # 2000ms distance to the last one, this edge marks the | |
252 | # beginning of a new minute (and DCF77 bit 0 of that minute). | |
253 | if len_edges_ms in range(1600, 2400 + 1): | |
2b0915c1 | 254 | self.bitcount = 0 |
aa4cf4c6 | 255 | self.ss_bit_old = self.ss_bit |
2b0915c1 | 256 | self.dcf77_bitnumber_is_known = 1 |
2b0915c1 | 257 | |
aa4cf4c6 | 258 | self.ss_bit_old = self.ss_bit |
abbc1285 | 259 | self.state = 'GET BIT' |
2b0915c1 | 260 | |
abbc1285 | 261 | elif self.state == 'GET BIT': |
2b0915c1 UH |
262 | # Wait until the next falling edge occurs. |
263 | if not (self.oldval == 1 and val == 0): | |
264 | self.oldval = val | |
265 | continue | |
266 | ||
09bca511 | 267 | # Save the sample number where the DCF77 bit ends. |
aa4cf4c6 | 268 | self.es_bit = self.samplenum |
09bca511 | 269 | |
2b0915c1 | 270 | # Calculate the length (in ms) of the current high period. |
aa4cf4c6 | 271 | len_high = self.samplenum - self.ss_bit |
2b0915c1 UH |
272 | len_high_ms = int((len_high / self.samplerate) * 1000) |
273 | ||
274 | # If the high signal was 100ms long, that encodes a 0 bit. | |
275 | # If it was 200ms long, that encodes a 1 bit. | |
276 | if len_high_ms in range(40, 160 + 1): | |
277 | bit = 0 | |
278 | elif len_high_ms in range(161, 260 + 1): | |
279 | bit = 1 | |
280 | else: | |
281 | bit = -1 # TODO: Error? | |
282 | ||
abbc1285 | 283 | # There's no bit 59, make sure none is decoded. |
2b0915c1 UH |
284 | if bit in (0, 1) and self.bitcount in range(0, 58 + 1): |
285 | self.handle_dcf77_bit(bit) | |
286 | self.bitcount += 1 | |
287 | ||
2b716038 | 288 | self.state = 'WAIT FOR RISING EDGE' |
2b0915c1 UH |
289 | |
290 | else: | |
0eeeb544 | 291 | raise Exception('Invalid state: %s' % self.state) |
2b0915c1 UH |
292 | |
293 | self.oldval = val | |
294 |