secondtimer.c

通过C语言控制数码管动态扫描显示

#include <reg52.h>
#define uchar unsigned char
#define uint  unsigned int


uchar code dutable[]={    //段选表
						0xc0,0xf9,0xa4,0xb0,0x99,
						0x92,0x82,0xf8,0x80,0x90,
						0x88,0x83,0xc6,0xa1,0x86,0xbf}; 
/*
uchar code dutable[]={    //共阴极段选表
						0x3f,0x06,0x5b,0x4f,
						0x66,0x6d,0x7d,0x07,
						0x7f,0x6f,0x77,0x7c,
						0x39,0x5e,0x79,0x71};*/

uchar code wetable[]={0xfe,0xfd,0xfb,0xf7};    //位选表

uchar Time_num;
uint fen,miao;
uint Set_key_num;	 //设置按钮的按下次数
sbit Set_key=P1^5;   //设置按钮
sbit Inc_key=P1^6;   //增1按钮
sbit Dec_key=P1^7;   //减1按钮

sbit D0 = P3^1;


void delay(uchar z)
{
	uchar x,y;
	for(x=110;x>0;x--)
		for(y=z;y>0;y--);
}

////////////////////
//  数码管显示函数
void display(uint ifen,uint imiao)
{
	uint shi_fen,ge_fen,shi_miao,ge_miao;

	shi_fen = ifen/10;
	ge_fen = ifen%10;
	shi_miao = imiao/10;
	ge_miao = imiao%10;

	P2=wetable[0];
	P0=dutable[shi_fen];
	delay(1);
	
	P2=wetable[1];
	P0=dutable[ge_fen];
	delay(1);
	
	P2=wetable[2];
	P0=dutable[shi_miao];
	delay(1);

	P2=wetable[3];
	P0=dutable[ge_miao];
	delay(1);	
}


void init()
{
	P2 = 0xff;
	Time_num=0;

	fen = 0;
	miao = 5;

	Set_key_num = 0;

	TMOD=0X01;
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	EA=1;
	ET0=0;
	TR0=0;	

	
}


void main()
{
	init();
	while(1)
	{
		////////////////////
		//倒计时处理
		if(Time_num == 20)
		{
			Time_num = 0;
			if(fen==0)
			{
				if(miao==1)     //倒计时完毕
				{
					D0=!D0;
					TR0=0;		//关闭定时器
				}
					
			}
			
			if(miao==-1)
			{
				miao=59;
				if(fen != 0)
					fen--;
			}
			miao--;	
						if(miao==-1)
			{
				miao=59;
				if(fen != 0)
					fen--;
			}
				
		}
			

		////////////////////
		//  "设置"键按下	
		if(Set_key!= 1)             
		{   
			delay(10);        
			if(Set_key!= 1)
			{   
				while(Set_key!= 1); 
				ET0=0;
				TR1=0; 					//停止走动

				Set_key_num++; 	        //次数加1
				if(Set_key_num == 3)    //按了3次
				{
					Set_key_num = 0;
					ET0=1;
					TR0=1;				//开始倒计时	
				}
			}
		}   
		////////////////////
		//  "增加"键按下
		if(Inc_key!= 1)              
		{   
			delay(10);       
			if(Inc_key!= 1)            
			{   
				while(Inc_key!= 1); 
				if(Set_key_num==1)	//按了1次，调分钟
				{
					if(fen==60)
						fen=0;
					else
						fen++;
				}
				if(Set_key_num==2)
				{
					if(miao==60)
						miao=0;
					else
						miao++;
					if(miao==60)
						miao=0;
				}
			}
		}   
		////////////////////
		//  "降低"键按下
		if(Dec_key!= 1)               
		{   
			delay(10);      
			if(Dec_key!= 1)         
			{   
				while(Dec_key!= 1); 
				if(Set_key_num==1)	//按了1次，调秒钟
				{ 
					if(fen==-1)
						fen=60;
					else 
						fen--;								
					if(fen == -1)
						fen=60;
				}
				if(Set_key_num==2)
				{
					if(miao==-1)
						miao=0;
					else
						miao--;	
					if(miao == -1)
						miao=59;
				}
			}
		}
	display(fen,miao);	
	}	

}


void timer0() interrupt 1	//时钟中断
{
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	Time_num++;	
}