[libsigrokdecode.git] / decoders / onewire_network / onewire_network.py

##
## 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 (network layer)

import sigrokdecode as srd

# Dictionary of ROM commands and their names, next state.
command = {
    0x33: ['Read ROM'              , 'GET ROM'   ],
    0x0f: ['Conditional read ROM'  , 'GET ROM'   ],
    0xcc: ['Skip ROM'              , 'TRANSPORT' ],
    0x55: ['Match ROM'             , 'GET ROM'   ],
    0xf0: ['Search ROM'            , 'SEARCH ROM'],
    0xec: ['Conditional search ROM', 'SEARCH ROM'],
    0x3c: ['Overdrive skip ROM'    , 'TRANSPORT' ],
    0x69: ['Overdrive match ROM'   , 'GET ROM'   ],
}

class Decoder(srd.Decoder):
    api_version = 1
    id = 'onewire_network'
    name = '1-Wire network layer'
    longname = '1-Wire serial communication bus (network layer)'
    desc = 'Bidirectional, half-duplex, asynchronous serial bus.'
    license = 'gplv2+'
    inputs = ['onewire_link']
    outputs = ['onewire_network']
    probes = []
    optional_probes = []
    options = {}
    annotations = [
        ['Text', 'Human-readable text'],
    ]

    def __init__(self, **kwargs):
        self.beg = 0
        self.end = 0
        self.state = 'COMMAND'
        self.bit_cnt = 0
        self.search = 'P'
        self.data_p = 0x0
        self.data_n = 0x0
        self.data = 0x0
        self.rom = 0x0000000000000000

    def start(self, metadata):
        self.out_proto = self.add(srd.OUTPUT_PROTO, 'onewire_network')
        self.out_ann = self.add(srd.OUTPUT_ANN, 'onewire_network')

    def report(self):
        pass

    def putx(self, data):
        # Helper function for most annotations.
        self.put(self.beg, self.end, self.out_ann, data)

    def puty(self, data):
        # Helper function for most protocol packets.
        self.put(self.beg, self.end, self.out_proto, data)

    def decode(self, ss, es, data):
        code, val = data

        # State machine.
        if code == 'RESET/PRESENCE':
            self.search = 'P'
            self.bit_cnt = 0
            self.put(ss, es, self.out_ann,
                     [0, ['Reset/presence: %s' % ('true' if val else 'false')]])
            self.put(ss, es, self.out_proto, ['RESET/PRESENCE', val])
            self.state = 'COMMAND'
            return

        # For now we're only interested in 'RESET/PRESENCE' and 'BIT' packets.
        if code != 'BIT':
            return

        if self.state == 'COMMAND':
            # Receiving and decoding a ROM command.
            if self.onewire_collect(8, val, ss, es) == 0:
                return
            if self.data in command:
                self.putx([0, ['ROM command: 0x%02x \'%s\''
                          % (self.data, command[self.data][0])]])
                self.state = command[self.data][1]
            else:
                self.putx([0, ['ROM command: 0x%02x \'%s\''
                          % (self.data, 'unrecognized')]])
                self.state = 'COMMAND ERROR'
        elif self.state == 'GET ROM':
            # A 64 bit device address is selected.
            # Family code (1 byte) + serial number (6 bytes) + CRC (1 byte)
            if self.onewire_collect(64, val, ss, es) == 0:
                return
            self.rom = self.data & 0xffffffffffffffff
            self.putx([0, ['ROM: 0x%016x' % self.rom]])
            self.puty(['ROM', self.rom])
            self.state = 'TRANSPORT'
        elif self.state == 'SEARCH ROM':
            # A 64 bit device address is searched for.
            # Family code (1 byte) + serial number (6 bytes) + CRC (1 byte)
            if self.onewire_search(64, val, ss, es) == 0:
                return
            self.rom = self.data & 0xffffffffffffffff
            self.putx([0, ['ROM: 0x%016x' % self.rom]])
            self.puty(['ROM', self.rom])
            self.state = 'TRANSPORT'
        elif self.state == 'TRANSPORT':
            # The transport layer is handled in byte sized units.
            if self.onewire_collect(8, val, ss, es) == 0:
                return
            self.putx([0, ['Data: 0x%02x' % self.data]])
            self.puty(['DATA', self.data])
        elif self.state == 'COMMAND ERROR':
            # Since the command is not recognized, print raw data.
            if self.onewire_collect(8, val, ss, es) == 0:
                return
            self.putx([0, ['ROM error data: 0x%02x' % self.data]])
        else:
            raise Exception('Invalid state: %s' % self.state)

    # Data collector.
    def onewire_collect(self, length, val, ss, es):
        # Storing the sample this sequence begins with.
        if self.bit_cnt == 1:
            self.beg = ss
        self.data = self.data & ~(1 << self.bit_cnt) | (val << self.bit_cnt)
        self.bit_cnt += 1
        # Storing the sample this sequence ends with.
        # In case the full length of the sequence is received, return 1.
        if self.bit_cnt == length:
            self.end = es
            self.data = self.data & ((1 << length) - 1)
            self.bit_cnt = 0
            return 1
        else:
            return 0

    # Search collector.
    def onewire_search(self, length, val, ss, es):
        # Storing the sample this sequence begins with.
        if (self.bit_cnt == 0) and (self.search == 'P'):
            self.beg = ss

        if self.search == 'P':
            # Master receives an original address bit.
            self.data_p = self.data_p & ~(1 << self.bit_cnt) | \
                          (val << self.bit_cnt)
            self.search = 'N'
        elif self.search == 'N':
            # Master receives a complemented address bit.
            self.data_n = self.data_n & ~(1 << self.bit_cnt) | \
                          (val << self.bit_cnt)
            self.search = 'D'
        elif self.search == 'D':
            # Master transmits an address bit.
            self.data = self.data & ~(1 << self.bit_cnt) | (val << self.bit_cnt)
            self.search = 'P'
            self.bit_cnt += 1

        # Storing the sample this sequence ends with.
        # In case the full length of the sequence is received, return 1.
        if self.bit_cnt == length:
            self.end = es
            self.data_p = self.data_p & ((1 << length) - 1)
            self.data_n = self.data_n & ((1 << length) - 1)
            self.data = self.data & ((1 << length) - 1)
            self.search = 'P'
            self.bit_cnt = 0
            return 1
        else:
            return 0
Commit	Line	Data
9cfb16e8 IJ	1	##
	2	## This file is part of the sigrok project.
	3	##
	4	## Copyright (C) 2012 Iztok Jeras <iztok.jeras@gmail.com>
	5	##
	6	## This program is free software; you can redistribute it and/or modify
	7	## it under the terms of the GNU General Public License as published by
	8	## the Free Software Foundation; either version 2 of the License, or
	9	## (at your option) any later version.
	10	##
	11	## This program is distributed in the hope that it will be useful,
	12	## but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	## GNU General Public License for more details.
	15	##
	16	## You should have received a copy of the GNU General Public License
	17	## along with this program; if not, write to the Free Software
	18	## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	##
	20
6188e4e4	21	# 1-Wire protocol decoder (network layer)
9cfb16e8 IJ	22
	23	import sigrokdecode as srd
	24
6188e4e4	25	# Dictionary of ROM commands and their names, next state.
758d2ea9	26	command = {
1fe967f2 UH	27	0x33: ['Read ROM' , 'GET ROM' ],
	28	0x0f: ['Conditional read ROM' , 'GET ROM' ],
	29	0xcc: ['Skip ROM' , 'TRANSPORT' ],
	30	0x55: ['Match ROM' , 'GET ROM' ],
	31	0xf0: ['Search ROM' , 'SEARCH ROM'],
	32	0xec: ['Conditional search ROM', 'SEARCH ROM'],
	33	0x3c: ['Overdrive skip ROM' , 'TRANSPORT' ],
	34	0x69: ['Overdrive match ROM' , 'GET ROM' ],
758d2ea9	35	}
9cfb16e8 IJ	36
	37	class Decoder(srd.Decoder):
	38	api_version = 1
	39	id = 'onewire_network'
	40	name = '1-Wire network layer'
6188e4e4	41	longname = '1-Wire serial communication bus (network layer)'
9cfb16e8 IJ	42	desc = 'Bidirectional, half-duplex, asynchronous serial bus.'
	43	license = 'gplv2+'
	44	inputs = ['onewire_link']
	45	outputs = ['onewire_network']
	46	probes = []
	47	optional_probes = []
	48	options = {}
	49	annotations = [
3f302d51	50	['Text', 'Human-readable text'],
9cfb16e8 IJ	51	]
	52
	53	def __init__(self, **kwargs):
48b59746 UH	54	self.beg = 0
48b59746 UH	55	self.end = 0
6188e4e4	56	self.state = 'COMMAND'
9cfb16e8	57	self.bit_cnt = 0
6188e4e4 UH	58	self.search = 'P'
	59	self.data_p = 0x0
	60	self.data_n = 0x0
	61	self.data = 0x0
48b59746	62	self.rom = 0x0000000000000000
9cfb16e8 IJ	63
	64	def start(self, metadata):
	65	self.out_proto = self.add(srd.OUTPUT_PROTO, 'onewire_network')
6188e4e4	66	self.out_ann = self.add(srd.OUTPUT_ANN, 'onewire_network')
9cfb16e8 IJ	67
	68	def report(self):
	69	pass
	70
6188e4e4 UH	71	def putx(self, data):
6188e4e4 UH	72	# Helper function for most annotations.
48b59746	73	self.put(self.beg, self.end, self.out_ann, data)
6188e4e4 UH	74
	75	def puty(self, data):
	76	# Helper function for most protocol packets.
48b59746	77	self.put(self.beg, self.end, self.out_proto, data)
6188e4e4	78
9cfb16e8	79	def decode(self, ss, es, data):
6188e4e4	80	code, val = data
9cfb16e8 IJ	81
9cfb16e8 IJ	82	# State machine.
6188e4e4 UH	83	if code == 'RESET/PRESENCE':
6188e4e4 UH	84	self.search = 'P'
9cfb16e8	85	self.bit_cnt = 0
6188e4e4	86	self.put(ss, es, self.out_ann,
3f302d51	87	[0, ['Reset/presence: %s' % ('true' if val else 'false')]])
a81787f6	88	self.put(ss, es, self.out_proto, ['RESET/PRESENCE', val])
6188e4e4	89	self.state = 'COMMAND'
48b59746 UH	90	return
	91
	92	# For now we're only interested in 'RESET/PRESENCE' and 'BIT' packets.
	93	if code != 'BIT':
	94	return
	95
	96	if self.state == 'COMMAND':
	97	# Receiving and decoding a ROM command.
	98	if self.onewire_collect(8, val, ss, es) == 0:
	99	return
	100	if self.data in command:
3f302d51	101	self.putx([0, ['ROM command: 0x%02x \'%s\''
48b59746 UH	102	% (self.data, command[self.data][0])]])
48b59746 UH	103	self.state = command[self.data][1]
9cfb16e8	104	else:
3f302d51 UH	105	self.putx([0, ['ROM command: 0x%02x \'%s\''
3f302d51 UH	106	% (self.data, 'unrecognized')]])
48b59746 UH	107	self.state = 'COMMAND ERROR'
	108	elif self.state == 'GET ROM':
	109	# A 64 bit device address is selected.
3f302d51	110	# Family code (1 byte) + serial number (6 bytes) + CRC (1 byte)
48b59746 UH	111	if self.onewire_collect(64, val, ss, es) == 0:
	112	return
	113	self.rom = self.data & 0xffffffffffffffff
	114	self.putx([0, ['ROM: 0x%016x' % self.rom]])
	115	self.puty(['ROM', self.rom])
	116	self.state = 'TRANSPORT'
	117	elif self.state == 'SEARCH ROM':
	118	# A 64 bit device address is searched for.
3f302d51	119	# Family code (1 byte) + serial number (6 bytes) + CRC (1 byte)
48b59746 UH	120	if self.onewire_search(64, val, ss, es) == 0:
	121	return
	122	self.rom = self.data & 0xffffffffffffffff
	123	self.putx([0, ['ROM: 0x%016x' % self.rom]])
	124	self.puty(['ROM', self.rom])
	125	self.state = 'TRANSPORT'
	126	elif self.state == 'TRANSPORT':
	127	# The transport layer is handled in byte sized units.
	128	if self.onewire_collect(8, val, ss, es) == 0:
	129	return
3f302d51	130	self.putx([0, ['Data: 0x%02x' % self.data]])
48b59746 UH	131	self.puty(['DATA', self.data])
	132	elif self.state == 'COMMAND ERROR':
	133	# Since the command is not recognized, print raw data.
	134	if self.onewire_collect(8, val, ss, es) == 0:
	135	return
3f302d51	136	self.putx([0, ['ROM error data: 0x%02x' % self.data]])
48b59746 UH	137	else:
48b59746 UH	138	raise Exception('Invalid state: %s' % self.state)
9cfb16e8	139
48b59746	140	# Data collector.
6188e4e4 UH	141	def onewire_collect(self, length, val, ss, es):
	142	# Storing the sample this sequence begins with.
	143	if self.bit_cnt == 1:
48b59746	144	self.beg = ss
9cfb16e8	145	self.data = self.data & ~(1 << self.bit_cnt) \| (val << self.bit_cnt)
6188e4e4 UH	146	self.bit_cnt += 1
	147	# Storing the sample this sequence ends with.
	148	# In case the full length of the sequence is received, return 1.
	149	if self.bit_cnt == length:
48b59746	150	self.end = es
6188e4e4 UH	151	self.data = self.data & ((1 << length) - 1)
	152	self.bit_cnt = 0
	153	return 1
9cfb16e8	154	else:
6188e4e4	155	return 0
9cfb16e8	156
48b59746	157	# Search collector.
6188e4e4 UH	158	def onewire_search(self, length, val, ss, es):
	159	# Storing the sample this sequence begins with.
	160	if (self.bit_cnt == 0) and (self.search == 'P'):
48b59746	161	self.beg = ss
6188e4e4 UH	162
	163	if self.search == 'P':
	164	# Master receives an original address bit.
	165	self.data_p = self.data_p & ~(1 << self.bit_cnt) \| \
	166	(val << self.bit_cnt)
	167	self.search = 'N'
	168	elif self.search == 'N':
	169	# Master receives a complemented address bit.
	170	self.data_n = self.data_n & ~(1 << self.bit_cnt) \| \
	171	(val << self.bit_cnt)
	172	self.search = 'D'
	173	elif self.search == 'D':
	174	# Master transmits an address bit.
	175	self.data = self.data & ~(1 << self.bit_cnt) \| (val << self.bit_cnt)
	176	self.search = 'P'
	177	self.bit_cnt += 1
	178
	179	# Storing the sample this sequence ends with.
	180	# In case the full length of the sequence is received, return 1.
	181	if self.bit_cnt == length:
48b59746	182	self.end = es
6188e4e4 UH	183	self.data_p = self.data_p & ((1 << length) - 1)
	184	self.data_n = self.data_n & ((1 << length) - 1)
	185	self.data = self.data & ((1 << length) - 1)
	186	self.search = 'P'
	187	self.bit_cnt = 0
	188	return 1
9cfb16e8	189	else:
6188e4e4	190	return 0