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##
## This file is part of the libsigrokdecode project.
##
## Copyright (C) 2014 Gump Yang <gump.yang@gmail.com>
##
## 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, write to the Free Software
## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
##
import sigrokdecode as srd
class Decoder(srd.Decoder):
api_version = 1
id = 'ir_nec'
name = 'IR NEC'
longname = 'IR NEC'
desc = 'NEC infrared remote control protocol.'
license = 'gplv2+'
inputs = ['logic']
outputs = ['ir_nec']
probes = [
{'id': 'ir', 'name': 'IR', 'desc': 'Data line'},
]
optional_probes = []
options = {
'polarity': ['Polarity', 'active-low'],
}
annotations = [
['bit', 'Bit'],
['lc', 'Leader code'],
['info', 'Info'],
['error', 'Error'],
]
annotation_rows = (
('bits', 'Bits', (0,)),
('fields', 'Fields', (1, 2, 3)),
)
def putx(self, data):
self.put(self.ss_start, self.samplenum, self.out_ann, data)
def putb(self, data):
self.put(self.ss_bit, self.samplenum, self.out_ann, data)
def __init__(self, **kwargs):
self.state = 'IDLE'
self.ss_bit = self.ss_start = 0
self.data = self.count = self.active = self.old_ir = None
def start(self):
# self.out_python = self.register(srd.OUTPUT_PYTHON)
self.out_ann = self.register(srd.OUTPUT_ANN)
self.active = 0 if self.options['polarity'] == 'active-low' else 1
self.old_ir = 1 if self.active == 0 else 0
def metadata(self, key, value):
if key == srd.SRD_CONF_SAMPLERATE:
self.samplerate = value
self.margin = int(self.samplerate * 0.0001) - 1 # 0.1ms
self.lc = int(self.samplerate * 0.0135) - 1 # 13.5ms
self.rc = int(self.samplerate * 0.01125) - 1 # 11.25ms
self.dazero = int(self.samplerate * 0.001125) - 1 # 1.125ms
self.daone = int(self.samplerate * 0.00225) - 1 # 2.25ms
def handle_bits(self, tick):
ret = 0xff
if tick in range(self.dazero - self.margin, self.dazero + self.margin):
ret = 0
elif tick in range(self.daone - self.margin, self.daone + self.margin):
ret = 1
if ret < 2:
self.putb([0, ['%d' % ret]])
self.data = self.data * 2 + ret
self.count = self.count + 1
self.ss_bit = self.samplenum
return ret
def data_judge(self):
ret, name = (self.data >> 8) & (self.data & 0xff), self.state.title()
if ret == 0:
self.putx([2, ['%s: 0x%02x' % (name, self.data >> 8)]])
else:
self.putx([3, ['%s error: 0x%04x' % (name, self.data)]])
self.data = self.count = 0
self.ss_bit = self.ss_start = self.samplenum
return ret
def decode(self, ss, es, data):
if self.samplerate is None:
raise Exception("Cannot decode without samplerate.")
for (self.samplenum, pins) in data:
self.ir = pins[0]
# Wait for an "active" edge (default: falling edge).
if self.old_ir == self.ir or self.ir != self.active:
self.old_ir = self.ir
continue
b = self.samplenum - self.ss_bit
# State machine.
if self.state == 'IDLE':
if b in range(self.lc - self.margin, self.lc + self.margin):
self.putx([1, ['Leader code', 'Leader', 'LC', 'L']])
self.data = self.count = 0
self.state = 'ADDRESS'
elif b in range(self.rc - self.margin, self.rc + self.margin):
self.putx([1, ['Repeat code', 'Repeat', 'RC', 'R']])
self.data = self.count = 0
self.ss_bit = self.ss_start = self.samplenum
elif self.state == 'ADDRESS':
self.handle_bits(b)
if self.count > 15:
self.state = 'COMMAND' if self.data_judge() == 0 else 'IDLE'
elif self.state == 'COMMAND':
self.handle_bits(b)
if self.count > 15:
self.data_judge()
self.state = 'IDLE'
self.old_ir = self.ir
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