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-rw-r--r--decoders/ds28ea00/__init__.py25
-rw-r--r--decoders/ds28ea00/pd.py89
2 files changed, 114 insertions, 0 deletions
diff --git a/decoders/ds28ea00/__init__.py b/decoders/ds28ea00/__init__.py
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+++ b/decoders/ds28ea00/__init__.py
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+##
+## 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
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+++ b/decoders/ds28ea00/pd.py
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+##
+## 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)]])