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57 lines
2.1 KiB
Python
Executable File
57 lines
2.1 KiB
Python
Executable File
##
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## This file is part of the libsigrokdecode project.
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##
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## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
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## Copyright (C) 2017 Kevin Redon <kingkevin@cuvoodoo.info>
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##
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 2 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program; if not, see <http://www.gnu.org/licenses/>.
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##
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'''
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This protocol decoder handles the 1-Wire link layer.
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The 1-Wire protocol enables bidirectional communication over a single wire
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(and ground) between a single master and one or multiple slaves. The protocol
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is layered:
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- Link layer (reset, presence detection, reading/writing bits)
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- Network layer (skip/search/match device ROM addresses)
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- Transport layer (transport data between 1-Wire master and device)
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Sample rate:
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A sufficiently high samplerate is required to properly detect all the elements
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of the protocol. A lower samplerate can be used if the master does not use
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overdrive communication speed. The following minimal values should be used:
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- overdrive available: 2MHz minimum, 5MHz suggested
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- overdrive not available: 400kHz minimum, 1MHz suggested
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Channels:
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1-Wire requires a single signal, but some master implementations might have a
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separate signal used to deliver power to the bus during temperature conversion
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as an example.
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- owr (1-Wire signal line)
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Options:
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1-Wire is an asynchronous protocol with fixed timing values, so the decoder
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must know the samplerate.
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Two speeds are available: normal and overdrive. The decoder detects when
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switching speed, but the user can set which to start decoding with:
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- overdrive (to decode starting with overdrive speed)
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'''
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from .pd import Decoder
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