完成：实验三 第一题

homework3/src/homework3.h

@@ -0,0 +1,29 @@
+// homework3.h
+// 这个文件是用来存放本实验中用到的宏定义和函数的
+#include <REG52.H>
+
+#define true  1
+#define false 0
+
+unsigned int i = 0;
+
+sbit D1 = P2 ^ 7;
+sbit D2 = P2 ^ 6;
+sbit D3 = P2 ^ 5;
+sbit D4 = P2 ^ 4;
+sbit D5 = P2 ^ 3;
+sbit D6 = P2 ^ 2;
+sbit D7 = P2 ^ 1;
+sbit D8 = P2 ^ 0;
+
+sbit ADDR0=P1^0;
+sbit ADDR1=P1^1;
+sbit ADDR2=P1^2;
+sbit ADDR3=P1^3;
+sbit ENLED=P1^4;
+
+
+void Delay(unsigned int t)
+{
+    while (t--);
+}