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92adde51 BE |
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 | |
4539e9ca | 18 | ## along with this program; if not, see <http://www.gnu.org/licenses/>. |
92adde51 BE |
19 | ## |
20 | ||
21 | import sigrokdecode as srd | |
2cd9b197 | 22 | from collections import deque |
92adde51 BE |
23 | |
24 | class SamplerateError(Exception): | |
25 | pass | |
26 | ||
27 | def normalize_time(t): | |
a9360134 | 28 | if abs(t) >= 1.0: |
2cd9b197 | 29 | return '%.3f s (%.3f Hz)' % (t, (1/t)) |
a9360134 | 30 | elif abs(t) >= 0.001: |
2cd9b197 UH |
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) | |
a9360134 | 35 | elif abs(t) >= 0.000001: |
2cd9b197 UH |
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) | |
a9360134 | 40 | elif abs(t) >= 0.000000001: |
2cd9b197 UH |
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) | |
92adde51 BE |
45 | else: |
46 | return '%f' % t | |
47 | ||
48 | class Decoder(srd.Decoder): | |
831e976a | 49 | api_version = 3 |
92adde51 BE |
50 | id = 'timing' |
51 | name = 'Timing' | |
2cd9b197 | 52 | longname = 'Timing calculation with frequency and averaging' |
92adde51 BE |
53 | desc = 'Calculate time between edges.' |
54 | license = 'gplv2+' | |
55 | inputs = ['logic'] | |
6cbba91f | 56 | outputs = [] |
d6d8a8a4 | 57 | tags = ['Clock/timing', 'Util'] |
92adde51 BE |
58 | channels = ( |
59 | {'id': 'data', 'name': 'Data', 'desc': 'Data line'}, | |
60 | ) | |
61 | annotations = ( | |
62 | ('time', 'Time'), | |
2cd9b197 | 63 | ('average', 'Average'), |
b8c44f69 | 64 | ('delta', 'Delta'), |
92adde51 BE |
65 | ) |
66 | annotation_rows = ( | |
67 | ('time', 'Time', (0,)), | |
2cd9b197 | 68 | ('average', 'Average', (1,)), |
b8c44f69 | 69 | ('delta', 'Delta', (2,)), |
2cd9b197 UH |
70 | ) |
71 | options = ( | |
72 | { 'id': 'avg_period', 'desc': 'Averaging period', 'default': 100 }, | |
b8c44f69 KP |
73 | { 'id': 'edge', 'desc': 'Edges to check', 'default': 'any', 'values': ('any', 'rising', 'falling') }, |
74 | { 'id': 'delta', 'desc': 'Show delta from last', 'default': 'no', 'values': ('yes', 'no') }, | |
92adde51 BE |
75 | ) |
76 | ||
92b7b49f | 77 | def __init__(self): |
10aeb8ea GS |
78 | self.reset() |
79 | ||
80 | def reset(self): | |
92adde51 | 81 | self.samplerate = None |
92adde51 | 82 | self.last_samplenum = None |
2cd9b197 UH |
83 | self.last_n = deque() |
84 | self.chunks = 0 | |
b8c44f69 KP |
85 | self.level_changed = False |
86 | self.last_t = None | |
92adde51 BE |
87 | |
88 | def metadata(self, key, value): | |
89 | if key == srd.SRD_CONF_SAMPLERATE: | |
90 | self.samplerate = value | |
91 | ||
92 | def start(self): | |
93 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
b8c44f69 | 94 | self.edge = self.options['edge'] |
92adde51 | 95 | |
831e976a | 96 | def decode(self): |
92adde51 BE |
97 | if not self.samplerate: |
98 | raise SamplerateError('Cannot decode without samplerate.') | |
831e976a | 99 | while True: |
b8c44f69 KP |
100 | if self.edge == 'rising': |
101 | pin = self.wait({0: 'r'}) | |
102 | elif self.edge == 'falling': | |
103 | pin = self.wait({0: 'f'}) | |
104 | else: | |
105 | pin = self.wait({0: 'e'}) | |
92adde51 | 106 | |
b8c44f69 | 107 | if not self.last_samplenum: |
963d71d5 | 108 | self.last_samplenum = self.samplenum |
92adde51 | 109 | continue |
b8c44f69 KP |
110 | samples = self.samplenum - self.last_samplenum |
111 | t = samples / self.samplerate | |
92adde51 | 112 | |
b8c44f69 KP |
113 | if t > 0: |
114 | self.last_n.append(t) | |
115 | if len(self.last_n) > self.options['avg_period']: | |
116 | self.last_n.popleft() | |
2cd9b197 | 117 | |
b8c44f69 KP |
118 | self.put(self.last_samplenum, self.samplenum, self.out_ann, |
119 | [0, [normalize_time(t)]]) | |
120 | if self.options['avg_period'] > 0: | |
121 | self.put(self.last_samplenum, self.samplenum, self.out_ann, | |
122 | [1, [normalize_time(sum(self.last_n) / len(self.last_n))]]) | |
123 | if self.last_t and self.options['delta'] == 'yes': | |
124 | self.put(self.last_samplenum, self.samplenum, self.out_ann, | |
125 | [2, [normalize_time(t - self.last_t)]]) | |
2cd9b197 | 126 | |
b8c44f69 KP |
127 | self.last_t = t |
128 | self.last_samplenum = self.samplenum |