Improve usb transfer and othre minor issues

libsigrokdecode4DSL/decoders/parallel/__init__.py

@@ -0,0 +1,35 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2013 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, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+##
+
+'''
+This protocol decoder can decode synchronous parallel buses with various
+number of data bits/channels and one (optional) clock line.
+
+If no clock line is supplied, the decoder works slightly differently in
+that it interprets every transition on any of the supplied data channels
+like there had been a clock transition.
+
+It is required to use the lowest data channels, and use consecutive ones.
+For example, for a 4-bit sync parallel bus, channels D0/D1/D2/D3 (and CLK)
+should be used. Using combinations like D7/D12/D3/D15 is not supported.
+For an 8-bit bus you should use D0-D7, for a 16-bit bus use D0-D15 and so on.
+'''
+
+from .pd import Decoder