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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2020 Tom Flanagan <knio@zkpq.ca>
##
## 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 ADDRESSES
class SamplerateError(Exception):
pass
class SIRCError(Exception):
pass
class SIRCErrorSilent(SIRCError):
pass
class Decoder(srd.Decoder):
api_version = 3
id = 'ir_sirc'
name = 'IR SIRC'
longname = 'IR SIRC'
desc = 'Sony SIRC infrared remote control protocol.'
license = 'gplv2+'
inputs = ['logic']
outputs = ['ir_sirc']
channels = (
dict(id='ir', name='IR', desc='Data line'),
)
options = (
dict(id='polarity', desc='Polarity', default='active-low',
values=('active-low', 'active-high')),
)
annotations = (
('bit', 'Bit'),
('agc', 'AGC'),
('pause', 'Pause'),
('start', 'Start'),
('command', 'Command'),
('address', 'Address'),
('extended', 'Extended'),
('remote', 'Remote'),
('warnings', 'Warnings'),
)
annotation_rows = (
('bits', 'Bits', (0, 1, 2)),
('fields', 'Fields', (3, 4, 5, 6)),
('remote', 'Remote', (7,)),
('warnings', 'Warnings', (8,)),
)
def __init__(self):
pass
def reset(self):
pass
def start(self):
self.out_ann = self.register(srd.OUTPUT_ANN)
self.active = self.options['polarity'] == 'active-high'
def metadata(self, key, value):
if key == srd.SRD_CONF_SAMPLERATE:
self.samplerate = value
def tolerance(self, start, end, expected):
microseconds = 1000000 * (end - start) / self.samplerate
tolerance = expected * 0.30
return (expected - tolerance) < microseconds < (expected + tolerance)
def wait(self, *conds, timeout=None):
conds = list(conds)
if timeout is not None:
to = int(self.samplerate * timeout / 1000000)
conds.append({'skip': to})
start = self.samplenum
signals = super(Decoder, self).wait(conds)
end = self.samplenum
return signals, start, end, self.matched
def read_pulse(self, high, time):
e = 'f' if high else 'r'
max_time = int(time * 1.30)
signals, start, end, (edge, timeout) = self.wait({0: e}, timeout=max_time)
if timeout or not self.tolerance(start, end, time):
raise SIRCError('Timeout')
return signals, start, end, (edge, timeout)
def read_bit(self):
e = 'f' if self.active else 'r'
signals, high_start, high_end, (edge, timeout) = self.wait({0:e}, timeout=2000)
if timeout:
raise SIRCError('Bit High Timeout')
if self.tolerance(high_start, high_end, 1200):
bit = 1
elif self.tolerance(high_start, high_end, 600):
bit = 0
else:
raise SIRCError('Bit Low Timeout')
try:
signals, low_start, low_end, matched = self.read_pulse(not self.active, 600)
good = True
except SIRCError:
low_end = high_end + int(600 * self.samplerate / 1000000)
good = False
self.put(high_start, low_end, self.out_ann, [0, [str(bit)]])
return bit, high_start, low_end, good
def read_signal(self):
# Start code
try:
signals, agc_start, agc_end, matched = self.read_pulse(self.active, 2400)
signals, pause_start, pause_end, matched = self.read_pulse(not self.active, 600)
except SIRCError:
raise SIRCErrorSilent('not an SIRC message')
self.put(agc_start, agc_end, self.out_ann, [1, ['AGC', 'A']])
self.put(pause_start, pause_end, self.out_ann, [2, ['Pause', 'P']])
self.put(agc_start, pause_end, self.out_ann, [3, ['Start', 'S']])
# Read bits
bits = []
while True:
bit, start, end, good = self.read_bit()
bits.append((bit, start, end))
if len(bits) > 20:
raise SIRCError('too many bits')
if not good:
if len(bits) == 12:
command = bits[0:7]
address = bits[7:12]
extended = []
elif len(bits) == 15:
command = bits[0:7]
address = bits[7:15]
extended = []
elif len(bits) == 20:
command = bits[0:7]
address = bits[7:12]
extended = bits[12:20]
else:
raise SIRCError('incorrect number of bits: {}'.format(len(bits)))
break
number = lambda bits:sum(b << i for i, (b, s, e) in enumerate(bits))
command_num = number(command)
address_num = number(address)
command_str = '0x{:02X}'.format(command_num)
address_str = '0x{:02X}'.format(address_num)
self.put(command[0][1], command[-1][2], self.out_ann, [4, ['Command: ' + command_str, 'C:' + command_str]])
self.put(address[0][1], address[-1][2], self.out_ann, [5, ['Address: ' + address_str, 'A:' + address_str]])
extended_num = None
if extended:
extended_num = number(extended)
extended_str = '0x{:02X}'.format(extended_num)
self.put(extended[0][1], extended[-1][2], self.out_ann, [6, ['Extended: ' + extended_str, 'E:' + extended_str]])
return address_num, command_num, extended_num, bits[0][1], bits[-1][2]
def decode(self):
if not self.samplerate:
raise SamplerateError('Cannot decode without samplerate.')
while True:
e = 'h' if self.active else 'l'
signal, start, end, matched = self.wait({0:e})
try:
address, command, extended, payload_start, payload_end = self.read_signal()
names, commands = ADDRESSES.get((address, extended), (['Unknown Device: ', 'UNK: '], {}))
text = commands.get(command, 'Unknown')
self.put(end, payload_end, self.out_ann, [7, [n + text for n in names]])
except SIRCErrorSilent as e:
continue
except SIRCError as e:
self.put(end, self.samplenum, self.out_ann, [8, ['Error: ' + str(e), 'Error', 'E']])
continue
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