/*
8位數(shù)碼管顯示  時間格式     05—50—00   標示05點50分00秒
S1 用于小時加1操作
S2 用于小時減1操作
S3 用于分鐘加1操作
S4 用于分鐘減1操作
*/

#include<reg52.h>
sbit KEY1=P3^0;        //定義端口參數(shù)
sbit KEY2=P3^1;
sbit KEY3=P3^2;
sbit KEY4=P3^3;
sbit LED=P1^2;        //定義指示燈參數(shù)

code unsigned char tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};        //共陰極數(shù)碼管0—9
unsigned char StrTab[8];        //定義緩沖區(qū)
unsigned char minute=19,hour=23,second;        //定義并初始化為 12:30:00

void delay(unsigned int cnt)
{
        while(--cnt);
}

/******************************************************************/
/*                                顯示處理函數(shù)                                      */
/******************************************************************/
void Displaypro(void)
{

        StrTab[0]=tab[hour/10];        //顯示小時
        StrTab[1]=tab[hour%10];
        StrTab[2]=0x40;        //顯示"-"
        StrTab[3]=tab[minute/10];        //顯示分鐘

        StrTab[4]=tab[minute%10];
        StrTab[5]=0x40;        //顯示"-"
        StrTab[6]=tab[second/10];        //顯示秒

        StrTab[7]=tab[second%10];
}

main()
{
        TMOD |=0x01;        //定時器0  10ms  inM  crystal  用于計時
        TH0=0xd8;           //初值
        TL0=0xf0;
        ET0=1;
        TR0=1;

        TMOD |=0x10;        //定時器1用于動態(tài)掃描
        TH1=0xF8;        //初值
        TL1=0xf0;
        ET1=1;
        TR1=1;
        EA =1;
        Displaypro();        //調(diào)用顯示處理函數(shù)

        while(1)
        {
                if(!KEY1)        //按鍵1去抖以及動作
                {
                        delay(10000);
                        if(!KEY1)
                        {         
                                hour++;

                                if(hour==24)

                                        hour=0;        //正常時間 小時 加1
                                Displaypro();
                        }
                }

                if(!KEY2)        //按鍵2去抖以及動作
                {
                        delay(10000);
                        if(!KEY2)
                        {
                                hour--;

                                if(hour==255)

                                        hour=23;        //正常時間 小時減1
                                Displaypro();
                        }
                }
                if(!KEY3)        //按鍵去抖以及動作
                {
                        delay(10000);
                        if(!KEY3)
                        {
                                minute++;

                                if(minute==60)

                                        minute=0;        //分加1
                                Displaypro();
                        }
                }      
                if(!KEY4)        //按鍵去抖以及動作
                {
                        delay(10000);
                        if(!KEY4)
                        {
                                minute--;

                                if(minute==255)

                                        minute=59;        //分減1
                                Displaypro();
                        }
                }
        }
}

/******************************************************************/
/*                           定時器1中斷                                   */
/******************************************************************/
void time1_isr(void) interrupt 3 using 0        //定時器1用來動態(tài)掃描
{
        static unsigned char num;
        TH1=0xF8;        //重入初值
        TL1=0xf0;

        switch (num)

        {
                case 0:P2=0;P0=StrTab[num];break;  //分別調(diào)用緩沖區(qū)的值進行掃描
                case 1:P2=1;P0=StrTab[num];break;
                case 2:P2=2;P0=StrTab[num];break;
                case 3:P2=3;P0=StrTab[num];break;
                case 4:P2=4;P0=StrTab[num];break;
                case 5:P2=5;P0=StrTab[num];break;
                case 6:P2=6;P0=StrTab[num];break;
                case 7:P2=7;P0=StrTab[num];break;
                default:break;
        }
        num++;        //掃描8次，使用8個數(shù)碼管
        if(num==8)
                num=0;
}

/******************************************************************/
/*                              定時器0中斷                                 */
/******************************************************************/
void tim(void) interrupt 1 using 1
{
        static unsigned char count;        //定義內(nèi)部局部變量

        TH0=0xd8;        //重新賦值
        TL0=0xf0;
        count++;
        switch (count)
        {
                case 0:
                case 20:
                case 40:
                case 60:
                case 80:Displaypro();break;        //隔一定時間調(diào)用顯示處理
                case 50:P1=~P1;break;        //半秒 LED 閃爍
                default:break;
        }

        if (count==100)
        {
                count=0;
                second++;        //秒加1
                if(second==60)
                {
                        second=0;
                        minute++;        //分加1
                        if(minute==60)
                        {
                                minute=0;
                                hour++;        //時加1
                                if(hour==24)
                                        hour=0;
                        } 
                }
        }
}