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

##
## 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 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 = 3
    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']
    annotations = (
        ('text', 'Human-readable text'),
    )

    def __init__(self):
        self.reset()

    def reset(self):
        self.ss_block = 0
        self.es_block = 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):
        self.out_python = self.register(srd.OUTPUT_PYTHON)
        self.out_ann = self.register(srd.OUTPUT_ANN)

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

    def puty(self, data):
        # Helper function for most protocol packets.
        self.put(self.ss_block, self.es_block, self.out_python, 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_python, ['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]])

    # Data collector.
    def onewire_collect(self, length, val, ss, es):
        # Storing the sample this sequence begins with.
        if self.bit_cnt == 0:
            self.ss_block = 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.es_block = 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.ss_block = 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.es_block = 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
	1	##
	2	## This file is part of the libsigrokdecode 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, see <http://www.gnu.org/licenses/>.
	18	##
	19
	20	import sigrokdecode as srd
	21
	22	# Dictionary of ROM commands and their names, next state.
	23	command = {
	24	0x33: ['Read ROM' , 'GET ROM' ],
	25	0x0f: ['Conditional read ROM' , 'GET ROM' ],
	26	0xcc: ['Skip ROM' , 'TRANSPORT' ],
	27	0x55: ['Match ROM' , 'GET ROM' ],
	28	0xf0: ['Search ROM' , 'SEARCH ROM'],
	29	0xec: ['Conditional search ROM', 'SEARCH ROM'],
	30	0x3c: ['Overdrive skip ROM' , 'TRANSPORT' ],
	31	0x69: ['Overdrive match ROM' , 'GET ROM' ],
	32	}
	33
	34	class Decoder(srd.Decoder):
	35	api_version = 3
	36	id = 'onewire_network'
	37	name = '1-Wire network layer'
	38	longname = '1-Wire serial communication bus (network layer)'
	39	desc = 'Bidirectional, half-duplex, asynchronous serial bus.'
	40	license = 'gplv2+'
	41	inputs = ['onewire_link']
	42	outputs = ['onewire_network']
	43	annotations = (
	44	('text', 'Human-readable text'),
	45	)
	46
	47	def __init__(self):
	48	self.reset()
	49
	50	def reset(self):
	51	self.ss_block = 0
	52	self.es_block = 0
	53	self.state = 'COMMAND'
	54	self.bit_cnt = 0
	55	self.search = 'P'
	56	self.data_p = 0x0
	57	self.data_n = 0x0
	58	self.data = 0x0
	59	self.rom = 0x0000000000000000
	60
	61	def start(self):
	62	self.out_python = self.register(srd.OUTPUT_PYTHON)
	63	self.out_ann = self.register(srd.OUTPUT_ANN)
	64
	65	def putx(self, data):
	66	# Helper function for most annotations.
	67	self.put(self.ss_block, self.es_block, self.out_ann, data)
	68
	69	def puty(self, data):
	70	# Helper function for most protocol packets.
	71	self.put(self.ss_block, self.es_block, self.out_python, data)
	72
	73	def decode(self, ss, es, data):
	74	code, val = data
	75
	76	# State machine.
	77	if code == 'RESET/PRESENCE':
	78	self.search = 'P'
	79	self.bit_cnt = 0
	80	self.put(ss, es, self.out_ann,
	81	[0, ['Reset/presence: %s' % ('true' if val else 'false')]])
	82	self.put(ss, es, self.out_python, ['RESET/PRESENCE', val])
	83	self.state = 'COMMAND'
	84	return
	85
	86	# For now we're only interested in 'RESET/PRESENCE' and 'BIT' packets.
	87	if code != 'BIT':
	88	return
	89
	90	if self.state == 'COMMAND':
	91	# Receiving and decoding a ROM command.
	92	if self.onewire_collect(8, val, ss, es) == 0:
	93	return
	94	if self.data in command:
	95	self.putx([0, ['ROM command: 0x%02x \'%s\''
	96	% (self.data, command[self.data][0])]])
	97	self.state = command[self.data][1]
	98	else:
	99	self.putx([0, ['ROM command: 0x%02x \'%s\''
	100	% (self.data, 'unrecognized')]])
	101	self.state = 'COMMAND ERROR'
	102	elif self.state == 'GET ROM':
	103	# A 64 bit device address is selected.
	104	# Family code (1 byte) + serial number (6 bytes) + CRC (1 byte)
	105	if self.onewire_collect(64, val, ss, es) == 0:
	106	return
	107	self.rom = self.data & 0xffffffffffffffff
	108	self.putx([0, ['ROM: 0x%016x' % self.rom]])
	109	self.puty(['ROM', self.rom])
	110	self.state = 'TRANSPORT'
	111	elif self.state == 'SEARCH ROM':
	112	# A 64 bit device address is searched for.
	113	# Family code (1 byte) + serial number (6 bytes) + CRC (1 byte)
	114	if self.onewire_search(64, val, ss, es) == 0:
	115	return
	116	self.rom = self.data & 0xffffffffffffffff
	117	self.putx([0, ['ROM: 0x%016x' % self.rom]])
	118	self.puty(['ROM', self.rom])
	119	self.state = 'TRANSPORT'
	120	elif self.state == 'TRANSPORT':
	121	# The transport layer is handled in byte sized units.
	122	if self.onewire_collect(8, val, ss, es) == 0:
	123	return
	124	self.putx([0, ['Data: 0x%02x' % self.data]])
	125	self.puty(['DATA', self.data])
	126	elif self.state == 'COMMAND ERROR':
	127	# Since the command is not recognized, print raw data.
	128	if self.onewire_collect(8, val, ss, es) == 0:
	129	return
	130	self.putx([0, ['ROM error data: 0x%02x' % self.data]])
	131
	132	# Data collector.
	133	def onewire_collect(self, length, val, ss, es):
	134	# Storing the sample this sequence begins with.
	135	if self.bit_cnt == 0:
	136	self.ss_block = ss
	137	self.data = self.data & ~(1 << self.bit_cnt) \| (val << self.bit_cnt)
	138	self.bit_cnt += 1
	139	# Storing the sample this sequence ends with.
	140	# In case the full length of the sequence is received, return 1.
	141	if self.bit_cnt == length:
	142	self.es_block = es
	143	self.data = self.data & ((1 << length) - 1)
	144	self.bit_cnt = 0
	145	return 1
	146	else:
	147	return 0
	148
	149	# Search collector.
	150	def onewire_search(self, length, val, ss, es):
	151	# Storing the sample this sequence begins with.
	152	if (self.bit_cnt == 0) and (self.search == 'P'):
	153	self.ss_block = ss
	154
	155	if self.search == 'P':
	156	# Master receives an original address bit.
	157	self.data_p = self.data_p & ~(1 << self.bit_cnt) \| \
	158	(val << self.bit_cnt)
	159	self.search = 'N'
	160	elif self.search == 'N':
	161	# Master receives a complemented address bit.
	162	self.data_n = self.data_n & ~(1 << self.bit_cnt) \| \
	163	(val << self.bit_cnt)
	164	self.search = 'D'
	165	elif self.search == 'D':
	166	# Master transmits an address bit.
	167	self.data = self.data & ~(1 << self.bit_cnt) \| (val << self.bit_cnt)
	168	self.search = 'P'
	169	self.bit_cnt += 1
	170
	171	# Storing the sample this sequence ends with.
	172	# In case the full length of the sequence is received, return 1.
	173	if self.bit_cnt == length:
	174	self.es_block = es
	175	self.data_p = self.data_p & ((1 << length) - 1)
	176	self.data_n = self.data_n & ((1 << length) - 1)
	177	self.data = self.data & ((1 << length) - 1)
	178	self.search = 'P'
	179	self.bit_cnt = 0
	180	return 1
	181	else:
	182	return 0