X-Git-Url: http://sigrok.org/gitweb/?a=blobdiff_plain;f=decoders%2Fi2c%2Fpd.py;h=c2eb5246fccb332f6bd81c6f71effc0cd8dc07a4;hb=efa641735217e5425f93e69cbaddf70d75c7e9e4;hp=53321eb02c401525e78fc3bd59774117a1078589;hpb=24c74fd30fb161837c5f8b01baf3c0fe2dfa4ed5;p=libsigrokdecode.git

diff --git a/decoders/i2c/pd.py b/decoders/i2c/pd.py
index 53321eb..c2eb524 100644
--- a/decoders/i2c/pd.py
+++ b/decoders/i2c/pd.py
@@ -1,5 +1,5 @@
 ##
-## This file is part of the sigrok project.
+## This file is part of the libsigrokdecode project.
 ##
 ## Copyright (C) 2010-2011 Uwe Hermann <uwe@hermann-uwe.de>
 ##
@@ -86,9 +86,9 @@ class Decoder(srd.Decoder):
         self.wr = -1
         self.is_repeat_start = 0
         self.state = 'FIND START'
-        self.oldscl = None
-        self.oldsda = None
-        self.oldpins = None
+        self.oldscl = 1
+        self.oldsda = 1
+        self.oldpins = (1, 1)
 
     def start(self, metadata):
         self.out_proto = self.add(srd.OUTPUT_PROTO, 'i2c')
@@ -206,12 +206,6 @@ class Decoder(srd.Decoder):
                 continue
             self.oldpins, (scl, sda) = pins, pins
 
-            # First sample: Save SCL/SDA value.
-            if self.oldscl == None:
-                self.oldscl = scl
-                self.oldsda = sda
-                continue
-
             # TODO: Wait until the bus is idle (SDA = SCL = 1) first?
 
             # State machine.
@@ -232,7 +226,7 @@ class Decoder(srd.Decoder):
                 if self.is_data_bit(scl, sda):
                     self.get_ack(scl, sda)
             else:
-                raise Exception('Invalid state %d' % self.STATE)
+                raise Exception('Invalid state: %s' % self.state)
 
             # Save current SDA/SCL values for the next round.
             self.oldscl = scl