[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 = 2
    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.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 == 1:
            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 = 2
	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.ss_block = 0
	49	self.es_block = 0
	50	self.state = 'COMMAND'
	51	self.bit_cnt = 0
	52	self.search = 'P'
	53	self.data_p = 0x0
	54	self.data_n = 0x0
	55	self.data = 0x0
	56	self.rom = 0x0000000000000000
	57
	58	def start(self):
	59	self.out_python = self.register(srd.OUTPUT_PYTHON)
	60	self.out_ann = self.register(srd.OUTPUT_ANN)
	61
	62	def putx(self, data):
	63	# Helper function for most annotations.
	64	self.put(self.ss_block, self.es_block, self.out_ann, data)
	65
	66	def puty(self, data):
	67	# Helper function for most protocol packets.
	68	self.put(self.ss_block, self.es_block, self.out_python, data)
	69
	70	def decode(self, ss, es, data):
	71	code, val = data
	72
	73	# State machine.
	74	if code == 'RESET/PRESENCE':
	75	self.search = 'P'
	76	self.bit_cnt = 0
	77	self.put(ss, es, self.out_ann,
	78	[0, ['Reset/presence: %s' % ('true' if val else 'false')]])
	79	self.put(ss, es, self.out_python, ['RESET/PRESENCE', val])
	80	self.state = 'COMMAND'
	81	return
	82
	83	# For now we're only interested in 'RESET/PRESENCE' and 'BIT' packets.
	84	if code != 'BIT':
	85	return
	86
	87	if self.state == 'COMMAND':
	88	# Receiving and decoding a ROM command.
	89	if self.onewire_collect(8, val, ss, es) == 0:
	90	return
	91	if self.data in command:
	92	self.putx([0, ['ROM command: 0x%02x \'%s\''
	93	% (self.data, command[self.data][0])]])
	94	self.state = command[self.data][1]
	95	else:
	96	self.putx([0, ['ROM command: 0x%02x \'%s\''
	97	% (self.data, 'unrecognized')]])
	98	self.state = 'COMMAND ERROR'
	99	elif self.state == 'GET ROM':
	100	# A 64 bit device address is selected.
	101	# Family code (1 byte) + serial number (6 bytes) + CRC (1 byte)
	102	if self.onewire_collect(64, val, ss, es) == 0:
	103	return
	104	self.rom = self.data & 0xffffffffffffffff
	105	self.putx([0, ['ROM: 0x%016x' % self.rom]])
	106	self.puty(['ROM', self.rom])
	107	self.state = 'TRANSPORT'
	108	elif self.state == 'SEARCH ROM':
	109	# A 64 bit device address is searched for.
	110	# Family code (1 byte) + serial number (6 bytes) + CRC (1 byte)
	111	if self.onewire_search(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 == 'TRANSPORT':
	118	# The transport layer is handled in byte sized units.
	119	if self.onewire_collect(8, val, ss, es) == 0:
	120	return
	121	self.putx([0, ['Data: 0x%02x' % self.data]])
	122	self.puty(['DATA', self.data])
	123	elif self.state == 'COMMAND ERROR':
	124	# Since the command is not recognized, print raw data.
	125	if self.onewire_collect(8, val, ss, es) == 0:
	126	return
	127	self.putx([0, ['ROM error data: 0x%02x' % self.data]])
	128
	129	# Data collector.
	130	def onewire_collect(self, length, val, ss, es):
	131	# Storing the sample this sequence begins with.
	132	if self.bit_cnt == 1:
	133	self.ss_block = ss
	134	self.data = self.data & ~(1 << self.bit_cnt) \| (val << self.bit_cnt)
	135	self.bit_cnt += 1
	136	# Storing the sample this sequence ends with.
	137	# In case the full length of the sequence is received, return 1.
	138	if self.bit_cnt == length:
	139	self.es_block = es
	140	self.data = self.data & ((1 << length) - 1)
	141	self.bit_cnt = 0
	142	return 1
	143	else:
	144	return 0
	145
	146	# Search collector.
	147	def onewire_search(self, length, val, ss, es):
	148	# Storing the sample this sequence begins with.
	149	if (self.bit_cnt == 0) and (self.search == 'P'):
	150	self.ss_block = ss
	151
	152	if self.search == 'P':
	153	# Master receives an original address bit.
	154	self.data_p = self.data_p & ~(1 << self.bit_cnt) \| \
	155	(val << self.bit_cnt)
	156	self.search = 'N'
	157	elif self.search == 'N':
	158	# Master receives a complemented address bit.
	159	self.data_n = self.data_n & ~(1 << self.bit_cnt) \| \
	160	(val << self.bit_cnt)
	161	self.search = 'D'
	162	elif self.search == 'D':
	163	# Master transmits an address bit.
	164	self.data = self.data & ~(1 << self.bit_cnt) \| (val << self.bit_cnt)
	165	self.search = 'P'
	166	self.bit_cnt += 1
	167
	168	# Storing the sample this sequence ends with.
	169	# In case the full length of the sequence is received, return 1.
	170	if self.bit_cnt == length:
	171	self.es_block = es
	172	self.data_p = self.data_p & ((1 << length) - 1)
	173	self.data_n = self.data_n & ((1 << length) - 1)
	174	self.data = self.data & ((1 << length) - 1)
	175	self.search = 'P'
	176	self.bit_cnt = 0
	177	return 1
	178	else:
	179	return 0