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1 | ## | |
2 | ## This file is part of the sigrok project. | |
3 | ## | |
4 | ## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de> | |
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 | ||
21 | ''' | |
22 | 1-Wire protocol decoder. | |
23 | ||
24 | The 1-Wire protocol enables bidirectional communication over a single wire (and | |
25 | ground) between a single master and one or multiple slaves. The protocol is | |
26 | layered. | |
27 | - Link layer (reset, presence detection, reading/writing bits) | |
28 | - Network layer (skip/search/match device ROM addresses) | |
29 | - Transport layer (transfer data between 1-Wire master and device) | |
30 | ||
31 | Transport layer | |
32 | ||
33 | The transport layer is the largest and most complex part of the protocol, since | |
34 | it is very device specific. The decoder is parsing only a small part of the | |
35 | protocol. | |
36 | ||
37 | Annotations: | |
38 | The next link layer annotations are shown: | |
39 | - RESET/PRESENCE True/False | |
40 | The event is marked from the signal negative edge to the end of the reset | |
41 | high period. It is also reported if there are any devices attached to the | |
42 | bus. | |
43 | The next network layer annotations are shown: | |
44 | - ROM val | |
45 | The 64bit value of the addressed device is displayed: | |
46 | family code (1B) + serial number (6B) + CRC (1B) | |
47 | - FUNCTION COMMAND val name | |
48 | The requested FUNCTION command is displayed as an 8bit HEX value and by name. | |
49 | - DATA val | |
50 | Data intended for the transport layer is displayed as an 8bit HEX value. | |
51 | ||
52 | TODO: | |
53 | - add CRC checks for transport layer | |
54 | ''' | |
55 | ||
56 | from .onewire_transport import * |