srd: Rename onewire_transport to maxim_ds28ea00.

It doesn't make sense to have one "generic" onewire_transport PD, as
this layer is very much device-specific and such a generic PD would
have to contain an accumulation of all possible features and commands
and handling code of all existing (now and in the future) 1-Wire
devices, which is neither possible nor useful nor elegant.

There are (for example) 1-Wire thermometers, RTCs, EEPROMs,
special-purpose security chips with passwords/keys, battery monitoring
chips, and many many others. They all have a different set of features,
commands and command codes, RAM areas/sizes/partitioning/contents,
protocols, and so on.

Thus, the layering for 1-Wire PD stacks should look like this:

 onewire_link -> onewire_network -> <specificdevice>

Examples:

 onewire_link -> onewire_network -> maxim_ds28ea00 (special thermometer)
 onewire_link -> onewire_network -> maxim_ds2431 (1kbit EEPROM)
 onewire_link -> onewire_network -> maxim_ds2417 (RTC)
 onewire_link -> onewire_network -> maxim_ds2762 (battery monitor)
 onewire_link -> onewire_network -> maxim_ds1961s (SHA-1 eCash iButton)
 and so on...

So, renaming onewire_transport to maxim_ds28ea00. The non-DS28EA00
specific code will be dropped and/or moved to other PDs on top of
onewire_network later.

1 files changed, 105 insertions, 0 deletions

diff --git a/decoders/maxim_ds28ea00/maxim_ds28ea00.py b/decoders/maxim_ds28ea00/maxim_ds28ea00.py
new file mode 100644
index 0000000..96a5aab
--- /dev/null
+++ b/decoders/maxim_ds28ea00/maxim_ds28ea00.py
@@ -0,0 +1,105 @@
+##
+## 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
+##
+
+# 1-Wire protocol decoder
+
+import sigrokdecode as srd
+
+# a 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",
+    # memory
+    0xf0: "READ MEMORY",
+    0xa5: "EXTENDED READ MEMORY",
+    0x0f: "WRITE MEMORY",
+    0x55: "WRITE STATUS",
+    0xaa: "READ STATUS",
+    0xf5: "CHANNEL ACCESS"
+}
+
+class Decoder(srd.Decoder):
+    api_version = 1
+    id = 'maxim_ds28ea00'
+    name = '1-Wire transport layer'
+    longname = '1-Wire serial communication bus'
+    desc = 'Bidirectional, half-duplex, asynchronous serial bus.'
+    license = 'gplv2+'
+    inputs = ['onewire_network']
+    outputs = []
+    probes = []
+    optional_probes = []
+    options = {}
+    annotations = [
+        ['Transport', 'Transport layer events'],
+    ]
+
+    def __init__(self, **kwargs):
+        # Event timing variables
+        self.trn_beg = 0
+        self.trn_end = 0
+        # Transport layer variables
+        self.state   = 'ROM'
+        self.rom     = 0x0000000000000000
+
+    def start(self, metadata):
+        self.out_ann   = self.add(srd.OUTPUT_ANN  , 'onewire_transport')
+
+    def report(self):
+        pass
+
+    def decode(self, ss, es, data):
+        [code, val] = data
+
+        # State machine.
+        if (code == "RESET/PRESENCE"):
+            self.put(ss, es, self.out_ann, [0, ['RESET/PRESENCE: %s' % ('True' if val else 'False')]])
+            self.state = "ROM"
+        elif (code == "ROM"):
+            self.rom = val
+            self.put(ss, es, self.out_ann, [0, ['ROM: 0x%016x' % (val)]])
+            self.state = "COMMAND"
+        elif (code == "DATA"):
+            if (self.state == "COMMAND"):
+                    if (val in command):
+                        self.put(ss, es, self.out_ann, [0, ['FUNCTION COMMAND: 0x%02x \'%s\'' % (val, command[val])]])
+                        self.state = command[val]
+                    else:
+                        self.put(ss, es, self.out_ann, [0, ['FUNCTION COMMAND: 0x%02x \'%s\'' % (val, 'UNRECOGNIZED')]])
+                        self.state = "UNRECOGNIZED"
+            elif (self.state == "READ SCRATCHPAD"):
+                self.put(ss, es, self.out_ann, [0, ['SCRATCHPAD DATA: 0x%02x' % (val)]])
+            elif (self.state == "CONVERT TEMPERATURE"):
+                self.put(ss, es, self.out_ann, [0, ['TEMPERATURE CONVERSION STATUS: 0x%02x' % (val)]])
+            elif (self.state in command.values()):
+                self.put(ss, es, self.out_ann, [0, ['TODO "%s": 0x%02x' % (self.state, val)]])
+            elif (self.state == "UNRECOGNIZED"):
+                self.put(ss, es, self.out_ann, [0, ['UNRECOGNIZED COMMAND: 0x%02x' % (val)]])
+            else:
+                raise Exception('Invalid state: %s' % self.state)