New macro, ordering.

inc/main.h

@@ -80,7 +80,9 @@ static volatile u08 saveRegister;
 #define ON    1
 #define OFF   0
 
-//#define NULL  0
+#ifndef NULL
+  #define NULL  0
+#endif // NULL
 
 /**
  * Maximum values of types
@@ -96,5 +98,13 @@ static volatile u08 saveRegister;
 #define MIN32S	-2147483648
 #define MAX32S	 2147483647
 
+/**
+ * GPIO defention
+ */
+#define HEATER_PORT   PORTB
+#define HEATER_PIN    PB1
+
+
+
 /*--------------------------------------------------------------------------*/
 #endif /* _MAIN_H_ */