单片机 & 4×4矩阵键盘 & 4位串行595数码管显示

 1 #include ? <reg52.h>
 2 #define uchar unsigned char
 3 #define uint unsigned int
 4 //Led数码管数
 5 sbit DIO = P2^0;//串行数据输入
 6 sbit LRCLK = P2^1;//时钟脉冲信号——上升沿有效
 7 sbit LSCLK = P2^2;//打入信号————上升沿有效
 8 unsigned char code LED_0F[] =
 9 {// 0 1 2 34 5 6 78 9 A bC d E F -
10 0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x8C,0xBF,0xC6,0xA1,0x86,0xFF,0xbf
11 };
12 uchar scan_keyboard(void); // 扫描键盘
13 void delay_ms(int n); //毫秒级延时函数
14 void get_LED(uchar key); //获得LED对应的数组值
15 void LED_ON(uchar x); //点亮led数码管
16 void main()
17 {
18 while(1){
19 uchar key = scan_keyboard();
20 get_LED(key);
21 }
22 }
23 void delay_ms(int n)
24 {
25 int i = 0, j = 0;
26 for(i = 0; i < n; i++)
27 for(j = 0; j < 100; j++);
28 }
29 void LED_ON(uchar lcode)
30 {
31 uint i;
32 for(i = 8;i >= 1; i--)
33 {
34 if (lcode & 0x80)
35 DIO = 1;
36 else
37 DIO = 0;
38 lcode <<= 1;
39 LSCLK = 0;
40 LSCLK = 1;
41 }
42 }
43 void LED_code(uchar value)
44 {
45 uchar code *led_table; // 查表指针
46 uchar lcode; //要得到的显示码
47 //显示第1位
48 led_table = LED_0F + value;
49 lcode = *led_table;
50 LED_ON(lcode);
51 LED_ON(0x01);
52 LRCLK = 0;
53 LRCLK = 1;
54 //显示第2位
55 }
56 void get_LED(uchar key)
57 {
58 if(key == 0x00)
59 return; //如果为0x00，说明没有扫描到值，返回
60 switch(key)
61 {
62 case 0xee: LED_code(0);break;//0按下相应的键显示相对应的码值
63 case 0xde: LED_code(1);break;//1 按下相应的键显示相对应的码值
64 case 0xbe: LED_code(2);break;//2
65 case 0x7e: LED_code(3);break;//3
66 case 0xed: LED_code(4);break;//4
67 case 0xdd: LED_code(5);break;//5
68 case 0xbd: LED_code(6);break;//6
69 case 0x7d: LED_code(7);break;//7
70 case 0xeb: LED_code(8);break;//8
71 case 0xdb: LED_code(9);break;//9
72 case 0xbb: LED_code(10);break;//a
73 case 0x7b: LED_code(11);break;//b
74 case 0xe7: LED_code(12);break;//c
75 case 0xd7: LED_code(13);break;//d
76 case 0xb7: LED_code(14);break;//e
77 case 0x77: LED_code(15);break;//f
78 }
79 }
80 uchar scan_keyboard()
81 {
82 uchar row_wire, col_wire; //定义行线和列线，行线0-3，列线4-7
83 P1 = 0xf0; //行线输出全为0,列线输出全为1
84 col_wire = P1 & 0xf0; //读入列线值
85 if(col_wire != 0xf0)
86 {
87 delay_ms(1); //去抖延时
88 if(col_wire != 0xf0)
89 {
90 col_wire = P1 & 0xf0; //读入列线值
91 P1 = col_wire | 0x0f; //输出当前列线值
92 row_wire = P1 & 0x0f; //读入行线值
93 return(col_wire + row_wire);//键盘最后组合码值
94 }
95 }
96 return 0x00;
97 }