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diff --git a/decoders/maxim_ds28ea00/pd.py b/decoders/maxim_ds28ea00/pd.py
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+##
+## This file is part of the sigrok 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
+##
+
+# Maxim DS28EA00 protocol decoder
+
+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 = 1
+    id = 'maxim_ds28ea00'
+    name = 'Maxim 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']
+    probes = []
+    optional_probes = [
+        {'id': 'pioa', 'name': 'PIOA/DONE#',
+         'desc': 'PIOA channel and chain output'},
+        {'id': 'piob', 'name': 'PIOB/EN#',
+         'desc': 'PIOB channel and chain output'},
+    ]
+    options = {}
+    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, metadata):
+        self.out_ann = self.add(srd.OUTPUT_ANN, 'maxim_ds28ea00')
+
+    def report(self):
+        pass
+
+    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)]])
+            else:
+                raise Exception('Invalid state: %s' % self.state)
+