| ## |
| ## This file is part of the libsigrokdecode project. |
| ## |
| ## Copyright (C) 2012 Iztok Jeras <iztok.jeras@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 |
| |
| # 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 = 2 |
| id = 'maxim_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 = ['maxim_ds28ea00'] |
| annotations = ( |
| ('text', 'Human-readable text'), |
| ) |
| |
| def __init__(self, **kwargs): |
| 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)]]) |
