【51单片机普中板子74LS138+245+573可调时钟整点蜂鸣中级应用】2022-12-7

缘由用51单片机普中开发板实现数字时钟-嵌入式-CSDN问答

#include "reg52.h"
//定义按键
sbit key0=P3^0;
sbit key1=P3^1;
sbit key2=P3^2;
sbit key3=P3^3;
//定义数码管位驱运位
sbit L1=P2^2;
sbit L2=P2^3;
sbit L3=P2^4;
sbit beep=P2^5;
unsigned char code ShuMaGuan[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F
,0x6F,0x00,0X80,64};//0~9隐.小数点-号
unsigned char Js=0, Miao=0, Fen=0, Shi=12;//中断计时 秒 分 时
void ShuMaXianShi(unsigned char s,unsigned char w,unsigned char d)
{
	unsigned char YanShi=0;
	if(w==2){L1=0;L2=L3=1;}//011
	else if(w==3){L2=0;L1=L3=1;}//101
	else if(w==4){L1=L2=0;L3=1;}//001
	else if(w==5){L1=L2=1;L3=0;}//110
	else if(w==6){L1=L3=0;L2=1;}//010
	else if(w==7){L1=1;L2=L3=0;}//100
	else if(w==8){L1=L2=L3=0;}//000
	else if(w==1){L1=L2=L3=1;}//111
	else {L1=L2=L3=0;}
	P0=ShuMaGuan[s]|ShuMaGuan[d];//d显示小数点11,10关闭
	while(++YanShi);
	P0=ShuMaGuan[10];
	L1=L2=L3=0;
}
void JiShi(/*时间计算*/)
{
	if(Js>=20)
	{
		Js=0;
		if(++Miao>=60){Miao=0;++Fen;}
		if(Fen>=60){Fen=0;++Shi;}
		if(Shi>=24)Shi=0;
	}
}
void XianShi()
{
		ShuMaXianShi(Shi/10,1,10);
		ShuMaXianShi(Shi%10,2,10);
		ShuMaXianShi(12,3,10);
		ShuMaXianShi(Fen/10,4,10);
		ShuMaXianShi(Fen%10,5,10);
		ShuMaXianShi(12,6,10);
		ShuMaXianShi(Miao/10,7,10);
		ShuMaXianShi(Miao%10,8,10);	
}
void ZhongDuanSheZhi()
{
	TH0+=0X4c;/*定时器赋初值，定时50ms触发中断，自动补偿方式*/
	TL0+=0X00; 
	TMOD=0X01;
	TR0=1; 
	ET0=1; //开启定时器
	EA=1; //全局中断开关
}
void ZhongDuan() interrupt 1
{
	++Js;
	TH0+=0X4c;
	TL0+=0X00;        
}
void main()
{
	unsigned char H=0,L=0,Ys=0;
	ZhongDuanSheZhi();
	while(1)
	{
		if(key0==0&&++Ys==0){Shi=(Shi?--Shi:23);}
		if(key1==0&&++Ys==0){Shi=(Shi>23?1:++Shi);}
		if(key2==0&&++Ys==0){Fen=(Fen?--Fen:59);}
		if(key3==0&&++Ys==0){Fen=(Fen>59?1:++Fen);}
		if(Fen==0&&Miao<9||Fen==30&&Miao<5)beep=~beep;
		XianShi();
		JiShi();
	}
}

#include "reg52.h"
//定义按键
sbit key0=P3^0;
sbit key1=P3^1;
sbit key2=P3^2;
sbit key3=P3^3;
//定义数码管位驱运位
sbit L1=P2^2;
sbit L2=P2^3;
sbit L3=P2^4;
sbit beep=P2^5;
unsigned char code ShuMaGuan[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x00,0X80,64};//0~9隐.小数点-号
unsigned char Js=0, Miao=0, Fen=0, Shi=12;//中断计时 秒 分 时
bit smk=0,bek=0;
void ShuMaXianShi(unsigned char s,unsigned char w,unsigned char d)
{
	unsigned char YanShi=0;
	if(smk)
	{
		P0=L1=L2=L3=0;
		if(w==2){L1=0;L2=L3=1;}//011
		else if(w==3){L2=0;L1=L3=1;}//101
		else if(w==4){L1=L2=0;L3=1;}//001
		else if(w==5){L1=L2=1;L3=0;}//110
		else if(w==6){L1=L3=0;L2=1;}//010
		else if(w==7){L1=1;L2=L3=0;}//100
		else if(w==8){L1=L2=L3=0;}//000
		else if(w==1){L1=L2=L3=1;}//111
		else {L1=L2=L3=0;}
		P0=ShuMaGuan[s]|ShuMaGuan[d];//d显示小数点11,10关闭
		if(++YanShi>7)YanShi=smk=0;
	}
}
void XianShi()
{
		ShuMaXianShi(Shi/10,1,10);
		ShuMaXianShi(Shi%10,2,10);
		ShuMaXianShi(12,3,10);
		ShuMaXianShi(Fen/10,4,10);
		ShuMaXianShi(Fen%10,5,10);
		ShuMaXianShi(12,6,10);
		ShuMaXianShi(Miao/10,7,10);
		ShuMaXianShi(Miao%10,8,10);	
}
void JiShi(/*时间计算*/)
{//if(Js%20==0)smk=1;
	if(Js==20)
	{
		Js=0;
		if(++Miao==60){Miao=0;++Fen;}
		if(Fen==60){Fen=0;++Shi;}
		if(Shi==24)Shi=0;
		smk=1;bek=!bek;
	}
	XianShi();
}
void ZhongDuanSheZhi()
{
	TH0+=0X4c;/*定时器赋初值，定时50ms触发中断，自动补偿方式*/
	TL0+=0X00; 
	TMOD=0X01;
	TR0=1; 
	ET0=1; //开启定时器
	EA=1; //全局中断开关
}
void ZhongDuan() interrupt 1
{
	++Js;
	TH0+=0X4c;
	TL0+=0X00;        
}
void main()
{
	unsigned char Ys=0;
	ZhongDuanSheZhi();
	while(1)
	{
		if(key0==0&&++Ys==0){Shi=(Shi?--Shi:23);while(key0==0)JiShi();}
		if(key1==0&&++Ys==0){Shi=(Shi>23?0:++Shi);while(key1==0)JiShi();}
		if(key2==0&&++Ys==0){Fen=(Fen?--Fen:59);while(key2==0)JiShi();}
		if(key3==0&&++Ys==0){Fen=(Fen>59?0:++Fen);while(key3==0)JiShi();}
		if(bek&&(Fen==0&&Miao<9||Fen==30&&Miao<5))beep=~beep;else beep=0;
		JiShi();
	}
}

之上代码蜂鸣器周期约20MS之下蜂鸣器周期约0.5MS。