+#define DIRSS P4DIR|=BIT2
+
+
+//Flash CS is P4.4, redefine only for the SPI app.
+#ifdef SPIAPPLICATION
+#undef SETSS
+#undef CLRSS
+#undef DIRSS
+#define SETSS P4OUT|=BIT4
+#define CLRSS P4OUT&=~BIT4
+#define DIRSS P4DIR|=BIT4
+#endif
+
+//CC2420 Chip Enable
+#define SETCE P4OUT|=BIT6
+#define CLRCE P4OUT&=~BIT6
+#define DIRCE P4DIR|=BIT6
+
+//CC2420 signals
+#define SFD (P4IN&BIT1)
+#define FIFOP (P1IN&BIT0)
+#define FIFO (P1IN&BIT3)
+
+// network byte order converters
+#define htons(x) ((((uint16_t)(x) & 0xFF00) >> 8) | \
+ (((uint16_t)(x) & 0x00FF) << 8))
+#define htonl(x) ((((uint32_t)(x) & 0xFF000000) >> 24) | \
+ (((uint32_t)(x) & 0x00FF0000) >> 8) | \
+ (((uint32_t)(x) & 0x0000FF00) << 8) | \
+ (((uint32_t)(x) & 0x000000FF) << 24))
+
+#define ntohs htons
+#define ntohl htonl