单片机：四位数码管显示时分，开关1 2 3 4分别增加时，减少时，增加分，减少分

#include<reg51.h>

 

#define uchar unsigned char;

#define uint unsigned int;

                                              

 

uchar position;           

uchar tt;             

uchar second;       

uchar minute;

uchar hour;       

 

 

uchar code table[]=

                            {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//0--9

 

                  

sbit smg_q = P2^0;  //???????

sbit smg_b = P2^1; 

sbit smg_s = P2^2;

sbit smg_g = P2^3;

 

sbit key1=P3^2;                 //????

sbit key2=P3^3;

sbit key3=P3^4;

sbit key4=P3^5u;

 

 

void keyscan();                   //????

void display(unsigned char hour,unsigned char minute);

void delay(unsigned int timer);

void init();                                              


/***********************************************************

                                     ???

***********************************************************/

void main()

{

         init();                                    

         while(1)

         {

                   if(tt==20)

                   {                          

                            tt=0;

                            second++;

                            if(second==60)

                            {

                                     second=0;

                                     minute++;

                                     if(minute==60)

                                     {       

                                               minute=0;

                                               hour++;

                                               if(hour==24)

                                                        hour=0;

                                     }

                            }

                   }

 

                   keyscan();

                   display(hour,minute);      

                   delay(1);

         }

}

/***********************************************************

                                     ??

***********************************************************/

void keyscan()

{

         if(key1==0)        //???1

         {

                   TR0=0;

                   hour++;

                            if(hour==24)

                                     hour=0;

                   delay(200)        ;

                   TR0=1;

         }

         if(key2==0)                 // ???

         {

                   TR0=0;

                   hour--;

                            if(hour<0)

                                     hour=23;

                   delay(200)        ;

                   TR0=1;

         }

 

         if(key3==0)                   // ???

         {

                   TR0=0;

                   minute++;

                            if(minute==60)

                                     minute=0;

                   delay(200)        ;

                   TR0=1;

         }

 

                   if(key4==0)                    //        ???

         {

                   TR0=0;

                   minute--;

                            if(minute<0)

                                     minute=59;

                   delay(200)        ;

                   TR0=1;

         }

}

 

/***********************************************************

                                                ???

***********************************************************/

void init()

{

         tt=0;

         position=0;               

         second=0; 

         minute=0;        

         hour=0;   

         smg_q=1;

         smg_b=1;

         smg_s=1;

         smg_g=1;

         key1=1;

         key2=1;

 

         TMOD=0X01;  

         TH0=(65536-50000)/256;        

         TL0=(65536-50000)%256;

         EA=1;                

         ET0=1;              

         TR0=1;              

}

 

/***********************************************************

                                                  ???TO??

***********************************************************/

void t0() interrupt 1

{

         TH0=(65536-50000)/256;        

         TL0=(65536-50000)%256;

         tt++;                                              

}

 

/***********************************************************

                                          ??

***********************************************************/

void display(unsigned char hour,unsigned char minute)

{

         P0=0XFF;                             

         switch(position)

         {

         case 0:              

                   smg_g=1;

                   smg_q=0;

                   P0=table[hour/10]; 

                   break;

 

         case 1:

                   smg_q=1;        

                   smg_b=0;        

                   P0=table[hour%10];

 

                   if(tt>=10)

                            P0&=0x7f;                  //???????????

                   break;

 

         case 2:    

                   smg_b=1;                  

                   smg_s=0;                  

                   P0=table[minute/10];

                   break;

         case 3:                       

                   smg_s=1;

                   smg_g=0;

                   P0=table[minute%10];

                   break;

         }

         position++;               

         if(position>3)

                   position=0;      

}

 

/***********************************************************

                                                 ??

***********************************************************/

void delay(unsigned int time)

{                

         unsigned int x,y;

         for(x=time;x>0;x--)

                   for(y=110;y>0;y--);

}