Add upstream uart decoder

Author: fornellas

libsigrokdecode4DSL/decoders/uart/__init__.py

@@ -0,0 +1,40 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## 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/>.
+##
+
+'''
+UART (Universal Asynchronous Receiver Transmitter) is a simple serial
+communication protocol which allows two devices to talk to each other.
+
+This decoder should work on all "UART-like" async protocols with one
+start bit (0), 5-9 databits, an (optional) parity bit, and one or more
+stop bits (1), in this order.
+
+It can be run on one signal line (RX or TX) only, or on two lines (RX + TX).
+
+There are various standards for the physical layer specification of the
+signals, including RS232, (TTL) UART, RS485, and others. However, the logic
+level of the respective pins is only relevant when acquiring the data via
+a logic analyzer (you have to select the correct logic analyzer and/or
+the correct place where to probe). Once the data is in digital form and
+matches the "UART" description above, this protocol decoder can work with
+it though, no matter whether the source was on TTL UART levels, or RS232,
+or others.
+'''
+
+from .pd import Decoder