diff options
Diffstat (limited to 'decoders/ds28ea00')
-rw-r--r-- | decoders/ds28ea00/__init__.py | 25 | ||||
-rw-r--r-- | decoders/ds28ea00/pd.py | 89 |
2 files changed, 114 insertions, 0 deletions
diff --git a/decoders/ds28ea00/__init__.py b/decoders/ds28ea00/__init__.py new file mode 100644 index 0000000..3155070 --- /dev/null +++ b/decoders/ds28ea00/__init__.py @@ -0,0 +1,25 @@ +## +## This file is part of the libsigrokdecode project. +## +## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> +## +## 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 <http://www.gnu.org/licenses/>. +## + +''' +This decoder stacks on top of the 'onewire_network' PD and decodes the +Maxim DS28EA00 1-Wire digital thermometer protocol. +''' + +from .pd import Decoder diff --git a/decoders/ds28ea00/pd.py b/decoders/ds28ea00/pd.py new file mode 100644 index 0000000..255f7c8 --- /dev/null +++ b/decoders/ds28ea00/pd.py @@ -0,0 +1,89 @@ +## +## 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, see <http://www.gnu.org/licenses/>. +## + +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 = '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)]]) |