add volatile to nReceivedValue and some other member vars.

See issue #119

RCSwitch.cpp

@@ -86,10 +86,10 @@ enum {
 };
 
 #if not defined( RCSwitchDisableReceiving )
-unsigned long RCSwitch::nReceivedValue = 0;
-unsigned int RCSwitch::nReceivedBitlength = 0;
-unsigned int RCSwitch::nReceivedDelay = 0;
-unsigned int RCSwitch::nReceivedProtocol = 0;
+volatile unsigned long RCSwitch::nReceivedValue = 0;
+volatile unsigned int RCSwitch::nReceivedBitlength = 0;
+volatile unsigned int RCSwitch::nReceivedDelay = 0;
+volatile unsigned int RCSwitch::nReceivedProtocol = 0;
 int RCSwitch::nReceiveTolerance = 60;
 const unsigned int RCSwitch::nSeparationLimit = 4300;
 // separationLimit: minimum microseconds between received codes, closer codes are ignored.

RCSwitch.h

@@ -167,10 +167,10 @@ class RCSwitch {
 
     #if not defined( RCSwitchDisableReceiving )
     static int nReceiveTolerance;
-    static unsigned long nReceivedValue;
-    static unsigned int nReceivedBitlength;
-    static unsigned int nReceivedDelay;
-    static unsigned int nReceivedProtocol;
+    volatile static unsigned long nReceivedValue;
+    volatile static unsigned int nReceivedBitlength;
+    volatile static unsigned int nReceivedDelay;
+    volatile static unsigned int nReceivedProtocol;
     const static unsigned int nSeparationLimit;
     /* 
      * timings[0] contains sync timing, followed by a number of bits