2 ## This file is part of the libsigrokdecode project.
4 ## Copyright (C) 2014 Gump Yang <gump.yang@gmail.com>
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.
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.
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/>.
20 from common.srdhelper import bitpack
22 import sigrokdecode as srd
24 class SamplerateError(Exception):
31 BIT, AGC, LONG_PAUSE, SHORT_PAUSE, STOP_BIT, \
32 LEADER_CODE, ADDR, ADDR_INV, CMD, CMD_INV, REPEAT_CODE, \
33 REMOTE, WARN = range(13)
35 class Decoder(srd.Decoder):
40 desc = 'NEC infrared remote control protocol.'
46 {'id': 'ir', 'name': 'IR', 'desc': 'Data line'},
49 {'id': 'polarity', 'desc': 'Polarity', 'default': 'active-low',
50 'values': ('active-low', 'active-high')},
51 {'id': 'cd_freq', 'desc': 'Carrier Frequency', 'default': 0},
55 ('agc-pulse', 'AGC pulse'),
56 ('longpause', 'Long pause'),
57 ('shortpause', 'Short pause'),
58 ('stop-bit', 'Stop bit'),
59 ('leader-code', 'Leader code'),
61 ('addr-inv', 'Address#'),
63 ('cmd-inv', 'Command#'),
64 ('repeat-code', 'Repeat code'),
66 ('warning', 'Warning'),
69 ('bits', 'Bits', (Ann.BIT, Ann.AGC, Ann.LONG_PAUSE, Ann.SHORT_PAUSE, Ann.STOP_BIT)),
70 ('fields', 'Fields', (Ann.LEADER_CODE, Ann.ADDR, Ann.ADDR_INV, Ann.CMD, Ann.CMD_INV, Ann.REPEAT_CODE)),
71 ('remote-vals', 'Remote', (Ann.REMOTE,)),
72 ('warnings', 'Warnings', (Ann.WARN,)),
76 self.put(self.ss_start, self.samplenum, self.out_ann, data)
79 self.put(self.ss_bit, self.samplenum, self.out_ann, data)
82 name = self.state.title()
83 d = {'ADDRESS': Ann.ADDR, 'ADDRESS#': Ann.ADDR_INV,
84 'COMMAND': Ann.CMD, 'COMMAND#': Ann.CMD_INV}
85 s = {'ADDRESS': ['ADDR', 'A'], 'ADDRESS#': ['ADDR#', 'A#'],
86 'COMMAND': ['CMD', 'C'], 'COMMAND#': ['CMD#', 'C#']}
87 self.putx([d[self.state], [
88 '{}: 0x{:02X}'.format(name, data),
89 '{}: 0x{:02X}'.format(s[self.state][0], data),
90 '{}: 0x{:02X}'.format(s[self.state][1], data),
94 def putstop(self, ss):
95 self.put(ss, ss + self.stop, self.out_ann,
96 [Ann.STOP_BIT, ['Stop bit', 'Stop', 'St', 'S']])
98 def putpause(self, p):
99 self.put(self.ss_start, self.ss_other_edge, self.out_ann,
100 [Ann.AGC, ['AGC pulse', 'AGC', 'A']])
101 idx = Ann.LONG_PAUSE if p == 'Long' else Ann.SHORT_PAUSE
102 self.put(self.ss_other_edge, self.samplenum, self.out_ann, [idx, [
103 '{} pause'.format(p),
104 '{}-pause'.format(p[0]),
110 dev = address.get(self.addr, 'Unknown device')
111 buttons = command.get(self.addr, {})
112 btn = buttons.get(self.cmd, ['Unknown', 'Unk'])
113 self.put(self.ss_remote, self.ss_bit + self.stop, self.out_ann, [Ann.REMOTE, [
114 '{}: {}'.format(dev, btn[0]),
115 '{}: {}'.format(dev, btn[1]),
124 self.ss_bit = self.ss_start = self.ss_other_edge = self.ss_remote = 0
126 self.addr = self.cmd = None
129 self.out_ann = self.register(srd.OUTPUT_ANN)
131 def metadata(self, key, value):
132 if key == srd.SRD_CONF_SAMPLERATE:
133 self.samplerate = value
136 self.tolerance = 0.05 # +/-5%
137 self.lc = int(self.samplerate * 0.0135) - 1 # 13.5ms
138 self.rc = int(self.samplerate * 0.01125) - 1 # 11.25ms
139 self.dazero = int(self.samplerate * 0.001125) - 1 # 1.125ms
140 self.daone = int(self.samplerate * 0.00225) - 1 # 2.25ms
141 self.stop = int(self.samplerate * 0.000652) - 1 # 0.652ms
143 def compare_with_tolerance(self, measured, base):
144 return (measured >= base * (1 - self.tolerance)
145 and measured <= base * (1 + self.tolerance))
147 def handle_bit(self, tick):
149 if self.compare_with_tolerance(tick, self.dazero):
151 elif self.compare_with_tolerance(tick, self.daone):
154 self.putb([Ann.BIT, ['{:d}'.format(ret)]])
155 self.data.append(ret)
156 self.ss_bit = self.samplenum
158 def data_ok(self, check):
159 name = self.state.title()
160 normal, inverted = bitpack(self.data[:8]), bitpack(self.data[8:])
161 valid = (normal ^ inverted) == 0xff
162 show = inverted if self.state.endswith('#') else normal
163 if len(self.data) == 8:
164 if self.state == 'ADDRESS':
166 if self.state == 'COMMAND':
169 self.ss_start = self.samplenum
171 if check and not valid:
172 warn_show = bitpack(self.data)
173 self.putx([Ann.WARN, ['{} error: 0x{:04X}'.format(name, warn_show)]])
177 self.ss_bit = self.ss_start = self.samplenum
181 if not self.samplerate:
182 raise SamplerateError('Cannot decode without samplerate.')
186 if self.options['cd_freq']:
187 cd_count = int(self.samplerate / self.options['cd_freq']) + 1
190 active = 0 if self.options['polarity'] == 'active-low' else 1
193 # Detect changes in the presence of an active input signal.
194 # The decoder can either be fed an already filtered RX signal
195 # or optionally can detect the presence of a carrier. Periods
196 # of inactivity (signal changes slower than the carrier freq,
197 # if specified) pass on the most recently sampled level. This
198 # approach works for filtered and unfiltered input alike, and
199 # only slightly extends the active phase of input signals with
200 # carriers included by one period of the carrier frequency.
201 # IR based communication protocols can cope with this slight
202 # inaccuracy just fine by design. Enabling carrier detection
203 # on already filtered signals will keep the length of their
204 # active period, but will shift their signal changes by one
205 # carrier period before they get passed to decoding logic.
207 (cur_ir,) = self.wait([{Pin.IR: 'e'}, {'skip': cd_count}])
210 if cur_ir == prev_ir:
215 (self.ir,) = self.wait({Pin.IR: 'e'})
217 if self.ir != active:
218 # Save the non-active edge, then wait for the next edge.
219 self.ss_other_edge = self.samplenum
222 b = self.samplenum - self.ss_bit
225 if self.state == 'IDLE':
226 if self.compare_with_tolerance(b, self.lc):
227 self.putpause('Long')
228 self.putx([Ann.LEADER_CODE, ['Leader code', 'Leader', 'LC', 'L']])
229 self.ss_remote = self.ss_start
231 self.state = 'ADDRESS'
232 elif self.compare_with_tolerance(b, self.rc):
233 self.putpause('Short')
234 self.putstop(self.samplenum)
235 self.samplenum += self.stop
236 self.putx([Ann.REPEAT_CODE, ['Repeat code', 'Repeat', 'RC', 'R']])
238 self.ss_bit = self.ss_start = self.samplenum
239 elif self.state == 'ADDRESS':
241 if len(self.data) == 8:
243 self.state = 'ADDRESS#'
244 elif self.state == 'ADDRESS#':
246 if len(self.data) == 16:
247 self.state = 'COMMAND' if self.data_ok(True) else 'IDLE'
248 elif self.state == 'COMMAND':
250 if len(self.data) == 8:
252 self.state = 'COMMAND#'
253 elif self.state == 'COMMAND#':
255 if len(self.data) == 16:
256 self.state = 'STOP' if self.data_ok(True) else 'IDLE'
257 elif self.state == 'STOP':
258 self.putstop(self.ss_bit)
260 self.ss_bit = self.ss_start = self.samplenum