FIX: Fixed an assert error.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@271 bbd45198-f89e-11dd-88c7-29a3b14d5316

bsp/sam7x/serial.c

@@ -137,8 +137,8 @@ static rt_err_t rt_serial_init (rt_device_t dev)
 
 	RT_ASSERT(serial != RT_NULL);
 	/* must be US0 or US1 */
-	RT_ASSERT((serial->peripheral_id != AT91C_ID_US0) &&
-			  (serial->peripheral_id != AT91C_ID_US1));
+	RT_ASSERT((serial->peripheral_id == AT91C_ID_US0) ||
+			  (serial->peripheral_id == AT91C_ID_US1));
 
 	/* Enable Clock for USART */
 	AT91C_PMC_PCER = 1 << serial->peripheral_id;