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1 | ## |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2014 Gump Yang <gump.yang@gmail.com> | |
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 | ||
21 | import sigrokdecode as srd | |
22 | ||
23 | class Decoder(srd.Decoder): | |
24 | api_version = 1 | |
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25 | id = 'ir_nec' |
26 | name = 'IR NEC' | |
27 | longname = 'IR NEC' | |
28 | desc = 'NEC infrared remote control protocol.' | |
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29 | license = 'gplv2+' |
30 | inputs = ['logic'] | |
00962e76 | 31 | outputs = ['ir_nec'] |
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32 | probes = [ |
33 | {'id': 'ir', 'name': 'IR', 'desc': 'Data line'}, | |
34 | ] | |
35 | optional_probes = [] | |
36 | options = { | |
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37 | 'cnt_lc': ['Leader code time (µs)', 13500], |
38 | 'cnt_rc': ['Repeat code time (µs)', 11250], | |
39 | 'cnt_rc_end': ['Repeat code end time (µs)', 562], | |
40 | 'cnt_accuracy': ['Accuracy range (µs)', 100], | |
41 | 'cnt_dazero': ['Data 0 time (µs)', 1125], | |
42 | 'cnt_daone': ['Data 1 time (µs)', 2250], | |
5e6fa9cc | 43 | 'polarity': ['Polarity', 'active-low'], |
00962e76 | 44 | } |
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45 | annotations = [ |
46 | ['bit', 'Bit'], | |
00962e76 | 47 | ['lc', 'Leader code'], |
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48 | ['info', 'Info'], |
49 | ['error', 'Error'], | |
50 | ] | |
51 | annotation_rows = ( | |
5e6fa9cc | 52 | ('bits', 'Bits', (0,)), |
00962e76 | 53 | ('fields', 'Fields', (1, 2, 3)), |
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54 | ) |
55 | ||
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56 | def putx(self, data): |
57 | self.put(self.ss_start, self.samplenum, self.out_ann, data) | |
58 | ||
59 | def putb(self, data): | |
60 | self.put(self.ss_bit, self.samplenum, self.out_ann, data) | |
61 | ||
62 | def __init__(self, **kwargs): | |
5e6fa9cc | 63 | self.ss_bit = 0 |
5e6fa9cc | 64 | self.state = 'IDLE' |
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65 | self.data = 0 |
66 | self.count = 0 | |
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67 | self.ss_start = 0 |
68 | self.act_polar = 0 | |
69 | ||
70 | def start(self): | |
71 | # self.out_python = self.register(srd.OUTPUT_PYTHON) | |
72 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
73 | self.act_polar = 1 if self.options['polarity'] == 'active-low' else 0 | |
74 | self.old_ir = self.act_polar | |
75 | ||
76 | def metadata(self, key, value): | |
77 | if key == srd.SRD_CONF_SAMPLERATE: | |
78 | self.samplerate = value | |
79 | samplerate = float(self.samplerate) | |
80 | ||
81 | x = float(self.options['cnt_accuracy']) / 1000000.0 | |
82 | self.margin = int(samplerate * x) - 1 | |
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83 | x = float(self.options['cnt_lc']) / 1000000.0 |
84 | self.lc = int(samplerate * x) - 1 | |
85 | x = float(self.options['cnt_rc']) / 1000000.0 | |
86 | self.rc = int(samplerate * x) - 1 | |
87 | x = float(self.options['cnt_rc_end']) / 1000000.0 | |
88 | self.rc_end = int(samplerate * x) - 1 | |
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89 | x = float(self.options['cnt_dazero']) / 1000000.0 |
90 | self.dazero = int(samplerate * x) - 1 | |
91 | x = float(self.options['cnt_daone']) / 1000000.0 | |
92 | self.daone = int(samplerate * x) - 1 | |
93 | x = float(10000) / 1000000.0 | |
94 | self.end = int(samplerate * x) - 1 | |
95 | ||
96 | def handle_bits(self, tick): | |
97 | ret = 0xff | |
00962e76 | 98 | if tick in range(self.dazero - self.margin, self.dazero + self.margin): |
5e6fa9cc | 99 | ret = 0 |
00962e76 | 100 | elif tick in range(self.daone - self.margin, self.daone + self.margin): |
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101 | ret = 1 |
102 | ||
103 | if ret < 2: | |
104 | self.putb([0, ['%d' % ret]]) | |
105 | self.data = self.data * 2 + ret | |
106 | self.count = self.count + 1 | |
107 | ||
108 | self.ss_bit = self.samplenum | |
00962e76 | 109 | return ret |
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110 | |
111 | def data_judge(self, name): | |
112 | buf = int((self.data & 0xff00) / 0x100) | |
113 | nbuf = int(self.data & 0xff) | |
114 | ret = buf & nbuf | |
115 | if ret == 0: | |
116 | self.putx([2, ['%s: 0x%02x' % (name, buf)]]) | |
117 | else: | |
118 | self.putx([3, ['%s Error: 0x%04x' % (name, self.data)]]) | |
00962e76 | 119 | |
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120 | self.data = self.count = 0 |
121 | self.ss_bit = self.ss_start = self.samplenum | |
122 | return ret | |
123 | ||
124 | def decode(self, ss, es, data): | |
125 | if self.samplerate is None: | |
126 | raise Exception("Cannot decode without samplerate.") | |
127 | for (self.samplenum, pins) in data: | |
128 | self.ir = pins[0] | |
00962e76 | 129 | |
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130 | # Wait for any edge (rising or falling). |
131 | if self.old_ir == self.ir: | |
132 | continue | |
133 | ||
134 | if self.old_ir == self.act_polar: | |
135 | b = self.samplenum - self.ss_bit | |
136 | # State machine. | |
137 | if self.state == 'IDLE': | |
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138 | if b in range(self.lc - self.margin, self.lc + self.margin): |
139 | self.putx([1, ['Leader code', 'Leader', 'LC', 'L']]) | |
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140 | self.data = self.count = 0 |
141 | self.state = 'ADDRESS' | |
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142 | elif b in range(self.rc - self.margin, self.rc + self.margin): |
143 | self.putx([1, ['Repeat code', 'Repeat', 'RC', 'R']]) | |
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144 | self.data = self.count = 0 |
145 | self.ss_bit = self.ss_start = self.samplenum | |
146 | elif self.state == 'ADDRESS': | |
147 | self.handle_bits(b) | |
148 | if self.count > 15: | |
149 | if self.data_judge(self.state) == 0: | |
00962e76 | 150 | self.state = 'COMMAND' |
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151 | else: |
152 | self.state = 'IDLE' | |
00962e76 | 153 | elif self.state == 'COMMAND': |
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154 | self.handle_bits(b) |
155 | if self.count > 15: | |
156 | self.data_judge(self.state) | |
157 | self.state = 'IDLE' | |
158 | ||
159 | self.old_ir = self.ir | |
160 |