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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2014 Torsten Duwe <duwe@suse.de> | |
5 | ## Copyright (C) 2014 Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com> | |
6 | ## | |
7 | ## This program is free software; you can redistribute it and/or modify | |
8 | ## it under the terms of the GNU General Public License as published by | |
9 | ## the Free Software Foundation; either version 2 of the License, or | |
10 | ## (at your option) any later version. | |
11 | ## | |
12 | ## This program is distributed in the hope that it will be useful, | |
13 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ## GNU General Public License for more details. | |
16 | ## | |
17 | ## You should have received a copy of the GNU General Public License | |
18 | ## along with this program; if not, see <http://www.gnu.org/licenses/>. | |
19 | ## | |
20 | ||
21 | import sigrokdecode as srd | |
22 | from collections import deque | |
23 | ||
24 | class SamplerateError(Exception): | |
25 | pass | |
26 | ||
27 | def normalize_time(t): | |
28 | if abs(t) >= 1.0: | |
29 | return '%.3f s (%.3f Hz)' % (t, (1/t)) | |
30 | elif abs(t) >= 0.001: | |
31 | if 1/t/1000 < 1: | |
32 | return '%.3f ms (%.3f Hz)' % (t * 1000.0, (1/t)) | |
33 | else: | |
34 | return '%.3f ms (%.3f kHz)' % (t * 1000.0, (1/t)/1000) | |
35 | elif abs(t) >= 0.000001: | |
36 | if 1/t/1000/1000 < 1: | |
37 | return '%.3f μs (%.3f kHz)' % (t * 1000.0 * 1000.0, (1/t)/1000) | |
38 | else: | |
39 | return '%.3f μs (%.3f MHz)' % (t * 1000.0 * 1000.0, (1/t)/1000/1000) | |
40 | elif abs(t) >= 0.000000001: | |
41 | if 1/t/1000/1000/1000: | |
42 | return '%.3f ns (%.3f MHz)' % (t * 1000.0 * 1000.0 * 1000.0, (1/t)/1000/1000) | |
43 | else: | |
44 | return '%.3f ns (%.3f GHz)' % (t * 1000.0 * 1000.0 * 1000.0, (1/t)/1000/1000/1000) | |
45 | else: | |
46 | return '%f' % t | |
47 | ||
48 | def terse_times(t, fmt): | |
49 | # Strictly speaking these variants are not used in the current | |
50 | # implementation, but can reduce diffs during future maintenance. | |
51 | if fmt == 'full': | |
52 | return [normalize_time(t)] | |
53 | # End of "forward compatibility". | |
54 | ||
55 | if fmt == 'samples': | |
56 | # See below. No unit text, on purpose. | |
57 | return ['{:d}'.format(t)] | |
58 | ||
59 | # Use caller specified scale, or automatically find one. | |
60 | scale, unit = None, None | |
61 | if fmt == 'terse-auto': | |
62 | if abs(t) >= 1e0: | |
63 | scale, unit = 1e0, 's' | |
64 | elif abs(t) >= 1e-3: | |
65 | scale, unit = 1e3, 'ms' | |
66 | elif abs(t) >= 1e-6: | |
67 | scale, unit = 1e6, 'us' | |
68 | elif abs(t) >= 1e-9: | |
69 | scale, unit = 1e9, 'ns' | |
70 | elif abs(t) >= 1e-12: | |
71 | scale, unit = 1e12, 'ps' | |
72 | # Beware! Uses unit-less text when the user picked the scale. For | |
73 | # more consistent output with less clutter, thus faster navigation | |
74 | # by humans. Can also un-hide text at higher distance zoom levels. | |
75 | elif fmt == 'terse-s': | |
76 | scale, unit = 1e0, '' | |
77 | elif fmt == 'terse-ms': | |
78 | scale, unit = 1e3, '' | |
79 | elif fmt == 'terse-us': | |
80 | scale, unit = 1e6, '' | |
81 | elif fmt == 'terse-ns': | |
82 | scale, unit = 1e9, '' | |
83 | elif fmt == 'terse-ps': | |
84 | scale, unit = 1e12, '' | |
85 | if scale: | |
86 | t *= scale | |
87 | return ['{:.0f}{}'.format(t, unit), '{:.0f}'.format(t)] | |
88 | ||
89 | # Unspecified format, and nothing auto-detected. | |
90 | return ['{:f}'.format(t)] | |
91 | ||
92 | class Pin: | |
93 | (DATA,) = range(1) | |
94 | ||
95 | class Ann: | |
96 | (TIME, TERSE, AVG, DELTA,) = range(4) | |
97 | ||
98 | class Decoder(srd.Decoder): | |
99 | api_version = 3 | |
100 | id = 'timing' | |
101 | name = 'Timing' | |
102 | longname = 'Timing calculation with frequency and averaging' | |
103 | desc = 'Calculate time between edges.' | |
104 | license = 'gplv2+' | |
105 | inputs = ['logic'] | |
106 | outputs = [] | |
107 | tags = ['Clock/timing', 'Util'] | |
108 | channels = ( | |
109 | {'id': 'data', 'name': 'Data', 'desc': 'Data line'}, | |
110 | ) | |
111 | annotations = ( | |
112 | ('time', 'Time'), | |
113 | ('terse', 'Terse'), | |
114 | ('average', 'Average'), | |
115 | ('delta', 'Delta'), | |
116 | ) | |
117 | annotation_rows = ( | |
118 | ('times', 'Times', (Ann.TIME, Ann.TERSE,)), | |
119 | ('averages', 'Averages', (Ann.AVG,)), | |
120 | ('deltas', 'Deltas', (Ann.DELTA,)), | |
121 | ) | |
122 | options = ( | |
123 | { 'id': 'avg_period', 'desc': 'Averaging period', 'default': 100 }, | |
124 | { 'id': 'edge', 'desc': 'Edges to check', | |
125 | 'default': 'any', 'values': ('any', 'rising', 'falling') }, | |
126 | { 'id': 'delta', 'desc': 'Show delta from last', | |
127 | 'default': 'no', 'values': ('yes', 'no') }, | |
128 | { 'id': 'format', 'desc': 'Format of \'time\' annotation', | |
129 | 'default': 'full', 'values': ('full', 'terse-auto', | |
130 | 'terse-s', 'terse-ms', 'terse-us', 'terse-ns', 'terse-ps', | |
131 | 'samples') }, | |
132 | ) | |
133 | ||
134 | def __init__(self): | |
135 | self.reset() | |
136 | ||
137 | def reset(self): | |
138 | self.samplerate = None | |
139 | ||
140 | def metadata(self, key, value): | |
141 | if key == srd.SRD_CONF_SAMPLERATE: | |
142 | self.samplerate = value | |
143 | ||
144 | def start(self): | |
145 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
146 | ||
147 | def decode(self): | |
148 | if not self.samplerate: | |
149 | raise SamplerateError('Cannot decode without samplerate.') | |
150 | edge = self.options['edge'] | |
151 | avg_period = self.options['avg_period'] | |
152 | delta = self.options['delta'] == 'yes' | |
153 | fmt = self.options['format'] | |
154 | ss = None | |
155 | last_n = deque() | |
156 | last_t = None | |
157 | while True: | |
158 | if edge == 'rising': | |
159 | pin = self.wait({Pin.DATA: 'r'}) | |
160 | elif edge == 'falling': | |
161 | pin = self.wait({Pin.DATA: 'f'}) | |
162 | else: | |
163 | pin = self.wait({Pin.DATA: 'e'}) | |
164 | ||
165 | if not ss: | |
166 | ss = self.samplenum | |
167 | continue | |
168 | es = self.samplenum | |
169 | sa = es - ss | |
170 | t = sa / self.samplerate | |
171 | ||
172 | if fmt == 'full': | |
173 | cls, txt = Ann.TIME, [normalize_time(t)] | |
174 | elif fmt == 'samples': | |
175 | cls, txt = Ann.TERSE, terse_times(sa, fmt) | |
176 | else: | |
177 | cls, txt = Ann.TERSE, terse_times(t, fmt) | |
178 | if txt: | |
179 | self.put(ss, es, self.out_ann, [cls, txt]) | |
180 | ||
181 | if avg_period > 0: | |
182 | if t > 0: | |
183 | last_n.append(t) | |
184 | if len(last_n) > avg_period: | |
185 | last_n.popleft() | |
186 | average = sum(last_n) / len(last_n) | |
187 | cls, txt = Ann.AVG, normalize_time(average) | |
188 | self.put(ss, es, self.out_ann, [cls, [txt]]) | |
189 | if last_t and delta: | |
190 | cls, txt = Ann.DELTA, normalize_time(t - last_t) | |
191 | self.put(ss, es, self.out_ann, [cls, [txt]]) | |
192 | ||
193 | last_t = t | |
194 | ss = es |