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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2014 Uwe Hermann <uwe@hermann-uwe.de>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, see <http://www.gnu.org/licenses/>.
##
import sigrokdecode as srd
from .lists import *
class SamplerateError(Exception):
pass
class Decoder(srd.Decoder):
api_version = 3
id = 'ir_rc5'
name = 'IR RC-5'
longname = 'IR RC-5'
desc = 'RC-5 infrared remote control protocol.'
license = 'gplv2+'
inputs = ['logic']
outputs = ['ir_rc5']
channels = (
{'id': 'ir', 'name': 'IR', 'desc': 'IR data line'},
)
options = (
{'id': 'polarity', 'desc': 'Polarity', 'default': 'active-low',
'values': ('active-low', 'active-high')},
{'id': 'protocol', 'desc': 'Protocol type', 'default': 'standard',
'values': ('standard', 'extended')},
)
annotations = (
('bit', 'Bit'),
('startbit1', 'Startbit 1'),
('startbit2', 'Startbit 2'),
('togglebit-0', 'Toggle bit 0'),
('togglebit-1', 'Toggle bit 1'),
('address', 'Address'),
('command', 'Command'),
)
annotation_rows = (
('bits', 'Bits', (0,)),
('fields', 'Fields', (1, 2, 3, 4, 5, 6)),
)
def __init__(self):
self.samplerate = None
self.samplenum = None
self.edges, self.bits, self.ss_es_bits = [], [], []
self.state = 'IDLE'
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
self.old_ir = 1 if self.options['polarity'] == 'active-low' else 0
def metadata(self, key, value):
if key == srd.SRD_CONF_SAMPLERATE:
self.samplerate = value
# One bit: 1.78ms (one half low, one half high).
self.halfbit = int((self.samplerate * 0.00178) / 2.0)
def putb(self, bit1, bit2, data):
ss, es = self.ss_es_bits[bit1][0], self.ss_es_bits[bit2][1]
self.put(ss, es, self.out_ann, data)
def handle_bits(self):
a, c, b = 0, 0, self.bits
# Individual raw bits.
for i in range(14):
if i == 0:
ss = max(0, self.bits[0][0] - self.halfbit)
else:
ss = self.ss_es_bits[i - 1][1]
es = self.bits[i][0] + self.halfbit
self.ss_es_bits.append([ss, es])
self.putb(i, i, [0, ['%d' % self.bits[i][1]]])
# Bits[0:0]: Startbit 1
s = ['Startbit1: %d' % b[0][1], 'SB1: %d' % b[0][1], 'SB1', 'S1', 'S']
self.putb(0, 0, [1, s])
# Bits[1:1]: Startbit 2
ann_idx = 2
s = ['Startbit2: %d' % b[1][1], 'SB2: %d' % b[1][1], 'SB2', 'S2', 'S']
if self.options['protocol'] == 'extended':
s = ['CMD[6]#: %d' % b[1][1], 'C6#: %d' % b[1][1], 'C6#', 'C#', 'C']
ann_idx = 6
self.putb(1, 1, [ann_idx, s])
# Bits[2:2]: Toggle bit
s = ['Togglebit: %d' % b[2][1], 'Toggle: %d' % b[2][1],
'TB: %d' % b[2][1], 'TB', 'T']
self.putb(2, 2, [3 if b[2][1] == 0 else 4, s])
# Bits[3:7]: Address (MSB-first)
for i in range(5):
a |= (b[3 + i][1] << (4 - i))
x = system.get(a, ['Unknown', 'Unk'])
s = ['Address: %d (%s)' % (a, x[0]), 'Addr: %d (%s)' % (a, x[1]),
'Addr: %d' % a, 'A: %d' % a, 'A']
self.putb(3, 7, [5, s])
# Bits[8:13]: Command (MSB-first)
for i in range(6):
c |= (b[8 + i][1] << (5 - i))
if self.options['protocol'] == 'extended':
inverted_bit6 = 1 if b[1][1] == 0 else 0
c |= (inverted_bit6 << 6)
cmd_type = 'VCR' if x[1] in ('VCR1', 'VCR2') else 'TV'
x = command[cmd_type].get(c, ['Unknown', 'Unk'])
s = ['Command: %d (%s)' % (c, x[0]), 'Cmd: %d (%s)' % (c, x[1]),
'Cmd: %d' % c, 'C: %d' % c, 'C']
self.putb(8, 13, [6, s])
def edge_type(self):
# Categorize according to distance from last edge (short/long).
distance = self.samplenum - self.edges[-1]
s, l, margin = self.halfbit, self.halfbit * 2, int(self.halfbit / 2)
if distance in range(l - margin, l + margin + 1):
return 'l'
elif distance in range(s - margin, s + margin + 1):
return 's'
else:
return 'e' # Error, invalid edge distance.
def reset_decoder_state(self):
self.edges, self.bits, self.ss_es_bits = [], [], []
self.state = 'IDLE'
def decode(self):
if not self.samplerate:
raise SamplerateError('Cannot decode without samplerate.')
while True:
(self.ir,) = self.wait({'skip': 1})
# Wait for any edge (rising or falling).
if self.old_ir == self.ir:
continue
# State machine.
if self.state == 'IDLE':
self.edges.append(self.samplenum)
self.bits.append([self.samplenum, 1])
self.state = 'MID1'
self.old_ir = self.ir
continue
edge = self.edge_type()
if edge == 'e':
self.reset_decoder_state() # Reset state machine upon errors.
continue
if self.state == 'MID1':
self.state = 'START1' if edge == 's' else 'MID0'
bit = None if edge == 's' else 0
elif self.state == 'MID0':
self.state = 'START0' if edge == 's' else 'MID1'
bit = None if edge == 's' else 1
elif self.state == 'START1':
if edge == 's':
self.state = 'MID1'
bit = 1 if edge == 's' else None
elif self.state == 'START0':
if edge == 's':
self.state = 'MID0'
bit = 0 if edge == 's' else None
self.edges.append(self.samplenum)
if bit is not None:
self.bits.append([self.samplenum, bit])
if len(self.bits) == 14:
self.handle_bits()
self.reset_decoder_state()
self.old_ir = self.ir
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