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Diffstat (limited to 'decoders/ir_nec/pd.py')
| -rw-r--r-- | decoders/ir_nec/pd.py | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/decoders/ir_nec/pd.py b/decoders/ir_nec/pd.py new file mode 100644 index 0000000..542139d --- /dev/null +++ b/decoders/ir_nec/pd.py @@ -0,0 +1,160 @@ +## +## 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 = { + 'cnt_lc': ['Leader code time (µs)', 13500], + 'cnt_rc': ['Repeat code time (µs)', 11250], + 'cnt_rc_end': ['Repeat code end time (µs)', 562], + 'cnt_accuracy': ['Accuracy range (µs)', 100], + 'cnt_dazero': ['Data 0 time (µs)', 1125], + 'cnt_daone': ['Data 1 time (µs)', 2250], + '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.ss_bit = 0 + self.state = 'IDLE' + self.data = 0 + self.count = 0 + self.ss_start = 0 + self.act_polar = 0 + + def start(self): + # self.out_python = self.register(srd.OUTPUT_PYTHON) + self.out_ann = self.register(srd.OUTPUT_ANN) + self.act_polar = 1 if self.options['polarity'] == 'active-low' else 0 + self.old_ir = self.act_polar + + def metadata(self, key, value): + if key == srd.SRD_CONF_SAMPLERATE: + self.samplerate = value + samplerate = float(self.samplerate) + + x = float(self.options['cnt_accuracy']) / 1000000.0 + self.margin = int(samplerate * x) - 1 + x = float(self.options['cnt_lc']) / 1000000.0 + self.lc = int(samplerate * x) - 1 + x = float(self.options['cnt_rc']) / 1000000.0 + self.rc = int(samplerate * x) - 1 + x = float(self.options['cnt_rc_end']) / 1000000.0 + self.rc_end = int(samplerate * x) - 1 + x = float(self.options['cnt_dazero']) / 1000000.0 + self.dazero = int(samplerate * x) - 1 + x = float(self.options['cnt_daone']) / 1000000.0 + self.daone = int(samplerate * x) - 1 + x = float(10000) / 1000000.0 + self.end = int(samplerate * x) - 1 + + 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, name): + buf = int((self.data & 0xff00) / 0x100) + nbuf = int(self.data & 0xff) + ret = buf & nbuf + if ret == 0: + self.putx([2, ['%s: 0x%02x' % (name, buf)]]) + 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 any edge (rising or falling). + if self.old_ir == self.ir: + continue + + if self.old_ir == self.act_polar: + 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: + if self.data_judge(self.state) == 0: + self.state = 'COMMAND' + else: + self.state = 'IDLE' + elif self.state == 'COMMAND': + self.handle_bits(b) + if self.count > 15: + self.data_judge(self.state) + self.state = 'IDLE' + + self.old_ir = self.ir + |