Add a trivial "counter" decoder

This decoder just counts the number of falling and/or rising edges. This
is especially useful for diagnosing protocols with a clock signal or a
fixed number of transitions per bit, e.g. pulse length coded.

It also provides a divider, which can be used to e.g. count the number
of words in I²C or SPI transfers.

1 files changed, 28 insertions, 0 deletions

diff --git a/decoders/counter/__init__.py b/decoders/counter/__init__.py
new file mode 100644
index 0000000..e731311
--- /dev/null
+++ b/decoders/counter/__init__.py
@@ -0,0 +1,28 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2018 Stefan Brüns <stefan.bruens@rwth-aachen.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/>.
+##
+
+'''
+This PD is a simple counter.
+
+It can count rising and/or falling edges, provides an optional reset
+signal. It can also divide the count to e.g. count the numger of
+fixed length words (where a word corresponds to e.g. 9 clock edges).
+'''
+
+from .pd import Decoder