2 ## This file is part of the libsigrokdecode project.
4 ## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
5 ## Copyright (C) 2017 Kevin Redon <kingkevin@cuvoodoo.info>
7 ## This program is free software; you can redistribute it and/or modify
8 ## it under the terms of the GNU General Public License as published by
9 ## the Free Software Foundation; either version 2 of the License, or
10 ## (at your option) any later version.
12 ## This program is distributed in the hope that it will be useful,
13 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 ## GNU General Public License for more details.
17 ## You should have received a copy of the GNU General Public License
18 ## along with this program; if not, see <http://www.gnu.org/licenses/>.
22 This protocol decoder handles the 1-Wire link layer.
24 The 1-Wire protocol enables bidirectional communication over a single wire
25 (and ground) between a single master and one or multiple slaves. The protocol
28 - Link layer (reset, presence detection, reading/writing bits)
29 - Network layer (skip/search/match device ROM addresses)
30 - Transport layer (transport data between 1-Wire master and device)
33 A sufficiently high samplerate is required to properly detect all the elements
34 of the protocol. A lower samplerate can be used if the master does not use
35 overdrive communication speed. The following minimal values should be used:
37 - overdrive available: 2MHz minimum, 5MHz suggested
38 - overdrive not available: 400kHz minimum, 1MHz suggested
41 1-Wire requires a single signal, but some master implementations might have a
42 separate signal used to deliver power to the bus during temperature conversion
45 - owr (1-Wire signal line)
48 1-Wire is an asynchronous protocol with fixed timing values, so the decoder
49 must know the samplerate.
50 Two speeds are available: normal and overdrive. The decoder detects when
51 switching speed, but the user can set which to start decoding with:
53 - overdrive (to decode starting with overdrive speed)
56 from .pd import Decoder