113 lines
1.6 KiB
C
113 lines
1.6 KiB
C
#include<reg52.h>
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typedef unsigned int u16;
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typedef unsigned char u8;
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//定义数码管的端口
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sbit D1 = P2^0;
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sbit D2 = P2^1;
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sbit D3 = P2^2;
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sbit D4 = P2^3;
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//定义按键的端口
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sbit K3 = P3^2;
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sbit K2 = P3^3;
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//0~9的段码
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u8 code table[]={0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90};
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u8 second;
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u8 key=0;
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// 1ms*1000=1s
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void delay1ms(u16 t)
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{
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u16 i,j;
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for(i=0;i<t;i++)
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{
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for(j=0;j<120;j++);
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}
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}
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void ExitInit() //定时器初始化
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{
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TMOD =0X01; //定时器0，工作方式1，16位定时器
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ET0=1;
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EA=1;
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second=0;
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TH0=0xFC;
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TL0=0x18;
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P3=0xff;
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P0=0x00;
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}
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void Display(u8 s) //数码管显示
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{
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D1=0;D2=1;
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P0=table[s/10];
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delay1ms(5);
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D1=1;D2=0;
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P0=table[s%10];
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delay1ms(5);
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}
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void Keyscan()
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{
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if (TR0 == 0) //定时器0关闭
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{
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if(K3==0)
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{
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delay1ms(10);
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if(K3==0)
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{
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TR0=1;
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}
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}
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if (K2==0)
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{
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second = 0;
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}
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}
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delay1ms(100);
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if (TR0 == 1)
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{
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if(K3==0)
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{
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delay1ms(10);
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if(K3==0)
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{
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TR0=0;
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}
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}
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}
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}
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void main()
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{
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ExitInit(); //定时器初始化
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while(1)
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{
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Display(second); //显示秒数
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Keyscan(); //按键扫描
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}
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}
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void Timer0() interrupt 1 //定时器0中断函数
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{
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static u16 timer;
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TH0=0XFC;
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TL0=0X18;
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timer++;
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//1ms*1000=1s
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if(timer==1000)
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{
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timer=0;
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second++;
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// 当second=100时，second=0，即从0开始计数
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if(second==100)
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second=0;
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}
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}
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// Path: C\按键计时.c
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