paobiao2.c

000-999跑表 STC89C52单片机 + 数码管显示

/*在上题的基础上，用另外三个独立键盘实现按下第一个S2时计时停止，
按下第二个S3时计时开始，按下第三个S4是计数值清零从头开始*/
#include<reg52.h>
sbit dula=P2^6;
sbit wela=P2^7;
sbit key=P3^4;
sbit key1=P3^5;
sbit key2=P3^6;
uint shu;
uchar t,bai,shi,ge,flag;
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delay(uint z)
{
    uint x,y;
    for(x=z;x>0;x--)
        for(y=110;y>0;y--);
}

void display(uchar aa,uchar bb,uchar cc)  //显示子程序
{
    dula=1;
    P0=table[aa];
    dula=0;
    P0=0xff;
    wela=1;
    P0=0xfe;
    wela=0;
    delay(1);

    dula=1;
    P0=table[bb];
    dula=0;
    P0=0xff;
    wela=1;
    P0=0xfd;
    wela=0;
    delay(1);

    dula=1;
    P0=table[cc];
    dula=0;
    P0=0xff;
    wela=1;
    P0=0xfb;
    wela=0;
    delay(1);
}

void init()
{
    shu=0;
    TMOD=0x01;
    TH0=(65536-50000)/256;
    TL0=(65536-50000)%256;
    EA=1;
    ET0=1;
    TR0=1;
}

void timer0() interrupt 1
{
    TH0=(65536-10000)/256;
    TL0=(65536-10000)%256;
    t++;
    if(t==1)
    {
        t=0;
        shu++;
        bai=shu/100;
        shi=shu%100/10;
        ge=shu%10;
        if(shu==999)
            shu=0;
    }
}

void main()
{
    init();
    while(1)
    {
          if(key==0)
            {
                delay(10);
                if(key==0)
                    TR0=0;
                 
            }
        else
            display(bai,shi,ge);
        if(key1==0)
        {
            delay(10);
            if(key1==0)
                TR0=1;
                display(bai,shi,ge);
        }
        if(key2==0)
        {
            delay(10);
            if(key2==0)
                shu=0;
                TR0=1;
                display(bai,shi,ge);    
        }
    }
}