初始化：实验二 第四题

homework2/src/test4.c

@@ -0,0 +1,11 @@
+//test4.c
+//让2个LED灯交替闪烁
+#include <reg52.h>
+#include "homework2.h"
+void main(){
+	ENLED = 0;
+	ADDR3 = 1;
+	ADDR2 = 1;
+	ADDR1 = 1;
+	ADDR0 = 0;
+}