From 00962e763e610d8535dd9df1ac97377b3fb727a7 Mon Sep 17 00:00:00 2001
From: Uwe Hermann <uwe@hermann-uwe.de>
Date: Fri, 7 Mar 2014 14:55:54 +0100
Subject: Rename 'ir_nec6122' PD to 'ir_nec', minor fixes and simplifications.
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This IR protocol is commonly referred to as "the NEC protocol", and can be
generated by various means (not only via the NEC µPD6121/µPD6122 ICs).
Drop some unneeded variables and fix/simplify the code a bit.
---
decoders/ir_nec/pd.py | 160 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 160 insertions(+)
create mode 100644 decoders/ir_nec/pd.py
(limited to 'decoders/ir_nec/pd.py')
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
+
--
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