Design a stopwatch with digital tube display using timer interrupt

//This stopwatch has time, minutes, seconds and milliseconds, and can record up to hours. It has pause and resume timing functions. Key1 on the independent keyboard is the pause and resume key, and key3 is the reset and start timing key.

//Since the ms interrupt time is very short, if the interrupt and display delay are not handled properly, the stopwatch will not run accurately.

 

 

#include

#define uchar unsigned char

#define uint unsigned int

uchar code table[]={0x 3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

uchar code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};        // Display the hours, minutes, and seconds with a decimal point

uchar ms,s,m,h,count,count1;

sbit k1=P3^0;

sbit k3=P3^2;

 

void delay(uint z)

{

     uint x,y;

     for(x=z;x>0;x--)

       for(y=110;y>0;y--);

}

 

 

 

void displays(uchar temp)       // Function to dynamically display seconds on digital tube

{

     uchar shi,ge,i;

     i=0;

     shi=temp/10;

     ge=temp;

 

    

        

         P0=0xef;

         P1=table[shi];

         delay(1);               // There must be a delay, dynamic scanning, in order not to affect the entire stopwatch eight-digit scanning rate to improve the display effect, the delay should not be too high, ms is more appropriate       

    

         P0=0xdf;

         P1=table1[ge];

         i=0;

         delay(1);

    

}

 

void displayms(uchar temp)       //Function for dynamically displaying milliseconds on digital tube

{

     uchar shi,ge,i;

     i=0;

     shi=temp/10;

     ge=temp;

 

    

        

         P0=0xbf;

         P1=table[shi];

         delay(1);

    

         P0=0x7f;

         P1=table[ge];

         i=0;

         delay(1);

    

}

 

void displaym(uchar temp)       //digital tube dynamic display function

{

     uchar shi,ge,i;

     i=0;

     shi=temp/10;

     ge=temp;

 

    

        

         P0=0xfb;

         P1=table[shi];

         delay(1);

    

         P0=0xf7;

         P1=table1[ge];

         i=0;

         delay(1);

    

}

 

void displayh(uchar temp)       // Function for dynamically displaying the hour position of the digital tube

{

     uchar shi,ge,i;

     i=0;

     shi=temp/10;

     ge=temp;

 

    

        

         P0=0xfe;

         P1=table[shi];

         delay(1);

    

         P0=0xfd;

         P1=table1[ge];

         i=0;

         delay(1);

    

}

 

 

 

void keyscan()            //Keyboard scanning function

{

     if(k1==0)

     {

     delay(5);

     if(k1==0)            //Check if k1 is pressed to prevent jitter

     {

         count++;

         while(!k1);         //Detect release

         delay(1);            // Check if the hand is released

         while(!k1);

 

         if(count==1)

         TR0=0;                //Pause timer

         if(count==2)

         {

              TR0=1;            //Timer continues timing

              count=0;

         }

     }

     }

     if(k3==0)

     {

     delay(5);

     if(k3==0)

     {

         count1++;

         while(!k3);

         delay(1);

         while(!k3);

         if(count1==1)     // reset the stopwatch

         {

         TR0=0;              

         ms=0;

         s=0;

         m=0;

         h=0;

         }

         if(count1==2)      //Restart timing        

         {

              TR0=1;          

              count1=0;

         }

     }

     }

}

 

void main()

{

 

     TMOD=0x01;

     EA=1;

     ET0=1;

     TR0=1;

     TH0=(65536-10000)/256;          //Set the initial value of the timer

     TL0=(65536-10000)%6;          //12M crystal oscillator: ms

     while(1)

     {

     keyscan();

     displays(s);                 //Dynamic scanning of digital tubes to display seconds

     displayms(ms);                  //digital tube dynamic scanning milliseconds display

     displaym(m);                 //digital tube dynamic scanning seconds and minutes display

     displayh(h);                  //digital tube dynamic scanning second hour display

     }

}

 

void timer0() interrupt 1            //interrupt service routine

{

     TH0=(65536-10000)/256;

     TL0=(65536-10000)%6;

     ms++;

     if(ms==100)                      //Timer interrupt times is s

     {                              //Putting this part in the interrupt can reduce the impact of program execution time on interrupt time

         ms=0;

         s++;

         if(s==60)

         {

         s=0;

          m++;

         }

         if(m==60)

         {

              m=0;

              h++;

         }

         if(h==24)

         {

              h=0;

         }

     }   

}