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1 | ## | |
2 | ## This file is part of the libsigrokdecode 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, see <http://www.gnu.org/licenses/>. | |
18 | ## | |
19 | ||
20 | ''' | |
21 | UART (Universal Asynchronous Receiver Transmitter) is a simple serial | |
22 | communication protocol which allows two devices to talk to each other. | |
23 | ||
24 | This decoder should work on all "UART-like" async protocols with one | |
25 | start bit (0), 5-9 databits, an (optional) parity bit, and one or more | |
26 | stop bits (1), in this order. | |
27 | ||
28 | It can be run on one signal line (RX or TX) only, or on two lines (RX + TX). | |
29 | ||
30 | There are various standards for the physical layer specification of the | |
31 | signals, including RS232, (TTL) UART, RS485, and others. However, the logic | |
32 | level of the respective pins is only relevant when acquiring the data via | |
33 | a logic analyzer (you have to select the correct logic analyzer and/or | |
34 | the correct place where to probe). Once the data is in digital form and | |
35 | matches the "UART" description above, this protocol decoder can work with | |
36 | it though, no matter whether the source was on TTL UART levels, or RS232, | |
37 | or others. | |
38 | ''' | |
39 | ||
40 | from .pd import Decoder |