## ## This file is part of the libsigrokdecode project. ## ## Copyright (C) 2012 Iztok Jeras ## ## 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 . ## import sigrokdecode as srd # Dictionary of FUNCTION commands and their names. command = { # Scratchpad 0x4e: 'Write scratchpad', 0xbe: 'Read scratchpad', 0x48: 'Copy scratchpad', # Thermometer 0x44: 'Convert temperature', 0xb4: 'Read power mode', 0xb8: 'Recall EEPROM', 0xf5: 'PIO access read', 0xA5: 'PIO access write', 0x99: 'Chain', } class Decoder(srd.Decoder): api_version = 3 id = 'ds28ea00' name = 'DS28EA00' longname = 'Maxim DS28EA00 1-Wire digital thermometer' desc = '1-Wire digital thermometer with Sequence Detect and PIO.' license = 'gplv2+' inputs = ['onewire_network'] outputs = ['ds28ea00'] annotations = ( ('text', 'Human-readable text'), ) def __init__(self): self.trn_beg = 0 self.trn_end = 0 self.state = 'ROM' self.rom = 0x0000000000000000 def start(self): self.out_ann = self.register(srd.OUTPUT_ANN) def putx(self, data): self.put(self.ss, self.es, self.out_ann, data) def decode(self, ss, es, data): code, val = data self.ss, self.es = ss, es # State machine. if code == 'RESET/PRESENCE': self.putx([0, ['Reset/presence: %s' % ('true' if val else 'false')]]) self.state = 'ROM' elif code == 'ROM': self.rom = val self.putx([0, ['ROM: 0x%016x' % (val)]]) self.state = 'COMMAND' elif code == 'DATA': if self.state == 'COMMAND': if val not in command: self.putx([0, ['Unrecognized command: 0x%02x' % val]]) return self.putx([0, ['Function command: 0x%02x \'%s\'' % (val, command[val])]]) self.state = command[val].upper() elif self.state == 'READ SCRATCHPAD': self.putx([0, ['Scratchpad data: 0x%02x' % val]]) elif self.state == 'CONVERT TEMPERATURE': self.putx([0, ['Temperature conversion status: 0x%02x' % val]]) elif self.state in [s.upper() for s in command.values()]: self.putx([0, ['TODO \'%s\': 0x%02x' % (self.state, val)]])