All PDs: Name the files pd.py consistently.

The Python module name is determined by the directory name (e.g. dcf77),
the *.py file names in that directory don't matter and can be kept
consistent.

1 files changed, 99 insertions, 0 deletions

diff --git a/decoders/i2cfilter/pd.py b/decoders/i2cfilter/pd.py
new file mode 100644
index 0000000..9c9c43a
--- /dev/null
+++ b/decoders/i2cfilter/pd.py
@@ -0,0 +1,99 @@
+##
+## This file is part of the sigrok project.
+##
+## Copyright (C) 2012 Bert Vermeulen <bert@biot.com>
+## 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 3 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/>.
+##
+
+# Generic I2C filtering protocol decoder
+
+# TODO: Support for filtering out multiple slave/direction pairs?
+
+import sigrokdecode as srd
+
+class Decoder(srd.Decoder):
+    api_version = 1
+    id = 'i2cfilter'
+    name = 'I2C filter'
+    longname = 'I2C filter'
+    desc = 'Filter out addresses/directions in an I2C stream.'
+    license = 'gplv3+'
+    inputs = ['i2c']
+    outputs = ['i2c']
+    probes = []
+    optional_probes = []
+    options = {
+        'address': ['Address to filter out of the I2C stream', 0],
+        'direction': ['Direction to filter (read/write/both)', 'both']
+    }
+    annotations = []
+
+    def __init__(self, **kwargs):
+        self.state = None
+        self.curslave = -1
+        self.curdirection = None
+        self.packets = [] # Local cache of I2C packets
+
+    def start(self, metadata):
+        self.out_proto = self.add(srd.OUTPUT_PROTO, 'i2c')
+        if self.options['address'] not in range(0, 127 + 1):
+            raise Exception('Invalid slave (must be 0..127).')
+        if self.options['direction'] not in ('both', 'read', 'write'):
+            raise Exception('Invalid direction (valid: read/write/both).')
+
+    def report(self):
+        pass
+
+    # Grab I2C packets into a local cache, until an I2C STOP condition
+    # packet comes along. At some point before that STOP condition, there
+    # will have been an ADDRESS READ or ADDRESS WRITE which contains the
+    # I2C address of the slave that the master wants to talk to.
+    # If that slave shall be filtered, output the cache (all packets from
+    # START to STOP) as proto 'i2c', otherwise drop it.
+    def decode(self, ss, es, data):
+
+        cmd, databyte = data
+
+        # Add the I2C packet to our local cache.
+        self.packets.append([ss, es, data])
+
+        if cmd in ('ADDRESS READ', 'ADDRESS WRITE'):
+            self.curslave = databyte
+            self.curdirection = cmd[8:].lower()
+        elif cmd in ('STOP', 'START REPEAT'):
+            # If this chunk was not for the correct slave, drop it.
+            if self.options['address'] == 0:
+                pass
+            elif self.curslave != self.options['address']:
+                self.packets = []
+                return
+
+            # If this chunk was not in the right direction, drop it.
+            if self.options['direction'] == 'both':
+                pass
+            elif self.options['direction'] != self.curdirection:
+                self.packets = []
+                return
+
+            # TODO: START->STOP chunks with both read and write (Repeat START)
+            # Otherwise, send out the whole chunk of I2C packets.
+            for p in self.packets:
+                self.put(p[0], p[1], self.out_proto, p[2])
+
+            self.packets = []
+        else:
+            pass # Do nothing, only add the I2C packet to our cache.
+