## ## This file is part of the libsigrokdecode project. ## ## Copyright (C) 2014 Gump Yang ## ## 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'], ['agc-pulse', 'AGC pulse'], ['longpause', 'Long pause'], ['shortpause', 'Short pause'], ['stop-bit', 'Stop bit'], ['leader-code', 'Leader code'], ['addr', 'Address'], ['addr-inv', 'Address#'], ['cmd', 'Command'], ['cmd-inv', 'Command#'], ['repeat-code', 'Repeat code'], ['warnings', 'Warnings'], ] annotation_rows = ( ('bits', 'Bits', (0, 1, 2, 3, 4)), ('fields', 'Fields', (5, 6, 7, 8, 9, 10)), ('warnings', 'Warnings', (11,)), ) 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 putd(self, data): name = self.state.title() d = {'ADDRESS': 6, 'ADDRESS#': 7, 'COMMAND': 8, 'COMMAND#': 9} s = {'ADDRESS': ['ADDR', 'A'], 'ADDRESS#': ['ADDR#', 'A#'], 'COMMAND': ['CMD', 'C'], 'COMMAND#': ['CMD#', 'C#']} self.putx([d[self.state], ['%s: 0x%02X' % (name, data), '%s: 0x%02X' % (s[self.state][0], data), '%s: 0x%02X' % (s[self.state][1], data), s[self.state][1]]]) def putstop(self, ss): self.put(ss, ss + self.stop, self.out_ann, [4, ['Stop bit', 'Stop', 'St', 'S']]) def putpause(self, p): self.put(self.ss_start, self.ss_other_edge, self.out_ann, [1, ['AGC pulse', 'AGC', 'A']]) idx = 2 if p == 'Long' else 3 self.put(self.ss_other_edge, self.samplenum, self.out_ann, [idx, [p + ' pause', '%s-pause' % p[0], '%sP' % p[0], 'P']]) def __init__(self, **kwargs): self.state = 'IDLE' self.ss_bit = self.ss_start = self.ss_other_edge = 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 self.stop = int(self.samplerate * 0.000652) - 1 # 0.652ms def handle_bit(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 def data_ok(self): ret, name = (self.data >> 8) & (self.data & 0xff), self.state.title() if self.count == 8: self.putd(self.data) self.ss_start = self.samplenum return True if ret == 0: self.putd(self.data & 0xff) else: self.putx([11, ['%s error: 0x%04X' % (name, self.data)]]) self.data = self.count = 0 self.ss_bit = self.ss_start = self.samplenum return ret == 0 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 "interesting" edge, but also record the other ones. if self.old_ir == self.ir: continue if self.ir != self.active: self.ss_other_edge = self.samplenum 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.putpause('Long') self.putx([5, ['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.putpause('Short') self.putstop(self.samplenum) self.samplenum += self.stop self.putx([10, ['Repeat code', 'Repeat', 'RC', 'R']]) self.data = self.count = 0 self.ss_bit = self.ss_start = self.samplenum elif self.state == 'ADDRESS': self.handle_bit(b) if self.count == 8: self.state = 'ADDRESS#' if self.data_ok() else 'IDLE' elif self.state == 'ADDRESS#': self.handle_bit(b) if self.count == 16: self.state = 'COMMAND' if self.data_ok() else 'IDLE' elif self.state == 'COMMAND': self.handle_bit(b) if self.count == 8: self.state = 'COMMAND#' if self.data_ok() else 'IDLE' elif self.state == 'COMMAND#': self.handle_bit(b) if self.count == 16: self.state = 'STOP' if self.data_ok() else 'IDLE' elif self.state == 'STOP': self.putstop(self.ss_bit) self.ss_bit = self.ss_start = self.samplenum self.state = 'IDLE' else: raise Exception('Invalid state: %s' % self.state) self.old_ir = self.ir