准备用C51做个学生管理系统（1）

  1 #include <reg52.h>
  2 
  3 #define uint unsigned int
  4 #define uchar unsigned char
  5 
  6 uchar code digitalSeg[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x67};
  7 uchar num = 0,cnt = 0;
  8 uchar pre_num = 16, now_num = 16;
  9 
 10 /*定时器的初始函数*/
 11 void init()
 12 {
 13     TMOD = 0x10;
 14     TH1 = (65535 - 46080) / 256;
 15     TL1 = (65535 - 46080) % 256;
 16     EA = 1;
 17     ET1 = 1;
 18 }
 19 /*延时*/
 20 void delay(uint i)
 21 {
 22     uint j;
 23     for(i; i > 0; i--)
 24         for(j = 0; j < 120; j++);
 25 }
 26 /*动态数码增加*/
 27 void display_seg(uint i)
 28 {
 29     uint shi = i/10;
 30     uint ge = i%10;
 31     delay(1);
 32     P2 = 0X01;
 33     P0 = ~digitalSeg[shi];
 34     delay(1);
 35     P2 = 0X02;
 36     P0 = ~digitalSeg[ge];
 37     delay(1);
 38     P0 = 0xff;    
 39 }
 40 /*键盘扫描*/
 41 void keyscan()
 42 {
 43     uchar tmp;
 44     P1 = 0x0f;
 45     delay(1);
 46     tmp = P1^0x0f;
 47 
 48     switch(tmp){
 49     case 1:
 50         now_num = 0;
 51         break;
 52     case 2:
 53         now_num = 1;
 54         break;
 55     case 4:
 56         now_num = 2;
 57         break;
 58     case 8:
 59         now_num = 3;
 60         break;
 61     default:
 62         now_num = 16;
 63     }
 64 
 65     P1 = 0xf0;
 66     delay(1);
 67     tmp = P1>>4^0x0f;
 68     switch(tmp){
 69     case 1:
 70         now_num += 0;
 71         break;
 72     case 2:
 73         now_num += 4;
 74         break;
 75     case 4:
 76         now_num += 8;
 77         break;
 78     case 8:
 79         now_num += 12;
 80     }
 81 }
 82 /*数码管数字变换*/
 83 void show()
 84 {
 85     if(pre_num != now_num)    
 86     {
 87         display_seg(now_num);
 88         pre_num = now_num;
 89     }
 90     display_seg(now_num);
 91     //delay(100);
 92 }
 93 
 94 //主函数
 95 void main()
 96 {
 97     int i = 0;
 98     int j = 0;
 99 
100     P0 = 0xff;
101     P2 = 0;
102     init();
103     TR1 = 1;
104 
105     cnt = 00;
106     while(1)
107     {
108            //display_seg(cnt);
109         P1 = 0xf0;
110         if(P1 != 0xf0)keyscan();
111         show();
112     }    
113 }
114 /*定时中断*/
115 void T1_time() interrupt 3
116 {
117     TH1 = (65535 - 46080) / 256;
118     TL1 = (65535 - 46080) / 256;
119     num++;
120     if(num == 20)
121     {
122         num = 0;
123         cnt++;
124     }
125 }