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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2019 Benedikt Otto <benedikt_o@web.de> | |
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 ChannelError(Exception): | |
23 | pass | |
24 | ||
25 | digits = { | |
26 | (0, 0, 0, 0, 0, 0, 0): ' ', | |
27 | (1, 1, 1, 1, 1, 1, 0): '0', | |
28 | (0, 1, 1, 0, 0, 0, 0): '1', | |
29 | (1, 1, 0, 1, 1, 0, 1): '2', | |
30 | (1, 1, 1, 1, 0, 0, 1): '3', | |
31 | (0, 1, 1, 0, 0, 1, 1): '4', | |
32 | (1, 0, 1, 1, 0, 1, 1): '5', | |
33 | (1, 0, 1, 1, 1, 1, 1): '6', | |
34 | (1, 1, 1, 0, 0, 0, 0): '7', | |
35 | (1, 1, 1, 1, 1, 1, 1): '8', | |
36 | (1, 1, 1, 1, 0, 1, 1): '9', | |
37 | (1, 1, 1, 0, 1, 1, 1): 'A', | |
38 | (0, 0, 1, 1, 1, 1, 1): 'B', | |
39 | (1, 0, 0, 1, 1, 1, 0): 'C', | |
40 | (0, 1, 1, 1, 1, 0, 1): 'D', | |
41 | (1, 0, 0, 1, 1, 1, 1): 'E', | |
42 | (1, 0, 0, 0, 1, 1, 1): 'F', | |
43 | } | |
44 | ||
45 | class Decoder(srd.Decoder): | |
46 | api_version = 3 | |
47 | id = 'seven_segment' | |
48 | name = '7-segment' | |
49 | longname = '7-segment display' | |
50 | desc = '7-segment display protocol.' | |
51 | license = 'gplv2+' | |
52 | inputs = ['logic'] | |
53 | outputs = [] | |
54 | tags = ['Display'] | |
55 | channels = ( | |
56 | {'id': 'a', 'name': 'A', 'desc': 'Segment A'}, | |
57 | {'id': 'b', 'name': 'B', 'desc': 'Segment B'}, | |
58 | {'id': 'c', 'name': 'C', 'desc': 'Segment C'}, | |
59 | {'id': 'd', 'name': 'D', 'desc': 'Segment D'}, | |
60 | {'id': 'e', 'name': 'E', 'desc': 'Segment E'}, | |
61 | {'id': 'f', 'name': 'F', 'desc': 'Segment F'}, | |
62 | {'id': 'g', 'name': 'G', 'desc': 'Segment G'}, | |
63 | ) | |
64 | optional_channels = ( | |
65 | {'id': 'dp', 'name': 'DP', 'desc': 'Decimal point'}, | |
66 | ) | |
67 | options = ( | |
68 | {'id': 'polarity', 'desc': 'Expected polarity', | |
69 | 'default': 'common-cathode', 'values': ('common-cathode', 'common-anode')}, | |
70 | ) | |
71 | annotations = ( | |
72 | ('decoded-digit', 'Decoded digit'), | |
73 | ) | |
74 | annotation_rows = ( | |
75 | ('decoded-digits', 'Decoded digits', (0,)), | |
76 | ) | |
77 | ||
78 | def __init__(self): | |
79 | self.reset() | |
80 | ||
81 | def reset(self): | |
82 | pass | |
83 | ||
84 | def start(self): | |
85 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
86 | ||
87 | def putb(self, ss_block, es_block, data): | |
88 | self.put(ss_block, es_block, self.out_ann, data) | |
89 | ||
90 | def pins_to_hex(self, pins): | |
91 | return digits.get(pins, None) | |
92 | ||
93 | def decode(self): | |
94 | oldpins = self.wait() | |
95 | ||
96 | # Check if at least the 7 signals are present. | |
97 | if False in [p in (0, 1) for p in oldpins[:7]]: | |
98 | raise ChannelError('7 or 8 pins have to be present.') | |
99 | ||
100 | lastpos = self.samplenum | |
101 | ||
102 | self.have_dp = self.has_channel(7) | |
103 | ||
104 | conditions = [{0: 'e'}, {1: 'e'}, {2: 'e'}, {3: 'e'}, {4: 'e'}, {5: 'e'}, {6: 'e'}] | |
105 | ||
106 | if self.have_dp: | |
107 | conditions.append({7: 'e'}) | |
108 | ||
109 | while True: | |
110 | # Wait for any change. | |
111 | pins = self.wait(conditions) | |
112 | ||
113 | if self.options['polarity'] == 'common-anode': | |
114 | # Invert all data lines if a common anode display is used. | |
115 | if self.have_dp: | |
116 | oldpins = tuple((1 - state for state in oldpins)) | |
117 | else: | |
118 | oldpins = tuple((1 - state for state in oldpins[:7])) | |
119 | ||
120 | # Convert to character string. | |
121 | digit = self.pins_to_hex(oldpins[:7]) | |
122 | ||
123 | if digit is not None: | |
124 | dp = oldpins[7] | |
125 | ||
126 | # Check if decimal point is present and active. | |
127 | if self.have_dp and dp == 1: | |
128 | digit += '.' | |
129 | ||
130 | self.putb(lastpos, self.samplenum, [0, [digit]]) | |
131 | ||
132 | lastpos = self.samplenum | |
133 | ||
134 | oldpins = pins |