diff options
Diffstat (limited to 'decoders/maxim_ds28ea00')
| -rw-r--r-- | decoders/maxim_ds28ea00/Makefile.am | 26 | ||||
| -rw-r--r-- | decoders/maxim_ds28ea00/__init__.py | 56 | ||||
| -rw-r--r-- | decoders/maxim_ds28ea00/maxim_ds28ea00.py | 105 |
3 files changed, 187 insertions, 0 deletions
diff --git a/decoders/maxim_ds28ea00/Makefile.am b/decoders/maxim_ds28ea00/Makefile.am new file mode 100644 index 0000000..ee53993 --- /dev/null +++ b/decoders/maxim_ds28ea00/Makefile.am @@ -0,0 +1,26 @@ +## +## This file is part of the sigrok 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, write to the Free Software +## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +## + +pkgdatadir = $(DECODERS_DIR)/maxim_ds28ea00 + +dist_pkgdata_DATA = __init__.py maxim_ds28ea00.py + +CLEANFILES = *.pyc + diff --git a/decoders/maxim_ds28ea00/__init__.py b/decoders/maxim_ds28ea00/__init__.py new file mode 100644 index 0000000..c6f063d --- /dev/null +++ b/decoders/maxim_ds28ea00/__init__.py @@ -0,0 +1,56 @@ +## +## This file is part of the sigrok 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, write to the Free Software +## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +## + +''' +1-Wire protocol decoder. + +The 1-Wire protocol enables bidirectional communication over a single wire (and +ground) between a single master and one or multiple slaves. The protocol is +layered. +- Link layer (reset, presence detection, reading/writing bits) +- Network layer (skip/search/match device ROM addresses) +- Transport layer (transport data between 1-Wire master and device) + +Transport layer + +The transport layer is the largest and most complex part of the protocol, since +it is very device specific. The decoder is parsing only a small part of the +protocol. + +Annotations: +The next link layer annotations are shown: +- RESET/PRESENCE True/False + The event is marked from the signal negative edge to the end of the reset + high period. It is also reported if there are any devices attached to the + bus. +The next network layer annotations are shown: +- ROM val + The 64bit value of the addressed device is displayed: + family code (1B) + serial number (6B) + CRC (1B) +- FUNCTION COMMAND val name + The requested FUNCTION command is displayed as an 8bit HEX value and by name. +- DATA val + Data intended for the transport layer is displayed as an 8bit HEX value. + +TODO: +- add CRC checks for transport layer +''' + +from .maxim_ds28ea00 import * 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) |