cs18-3.c

《手把手教你学单片机的C程序设计》及实验程序

#include <REG51.H>		
#define uchar unsigned char	
uchar code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar code WEEK_SEG7[8]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x7f,};
uchar ACT[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; 
uchar  deda,sec,min,hour,week=1;	
uchar cnt;		
/*************************************************/
void init(void)				
{						
TMOD=0x11;				
TH0=-(50000/256);				
TL0=-(50000%256);			
ET0=1;						
TR0=1;	
TH1=-(1000/256);				
TL1=-(1000%256);			
ET1=1;						
TR1=1;						
EA=1;						
}							
/********************************************/
void time0(void) interrupt 1 		
{							
TH0=-(50000/256);				
TL0=-(50000%256);			
deda++;						
}		
/*******************************************/
void time1(void) interrupt 3 		
{							
TH1=-(1000/256);				
TL1=-(1000%256);			
if(++cnt>7)cnt=0;
switch (cnt)					
{
case 0:P0=SEG7[sec%10];P2=ACT[0];break;
case 1:P0=SEG7[sec/10];P2=ACT[1];break;
case 2:P0=SEG7[min%10];P2=ACT[2];break;
case 3:P0=SEG7[min/10];P2=ACT[3];break;
case 4:P0=SEG7[hour%10];P2=ACT[4];break;
case 5:P0=SEG7[hour/10];P2=ACT[5];break;
case 6:P0=0x00;P2=0xff;break;
case 7:P0=WEEK_SEG7[week];P2=ACT[7];break;
default:break;
}
}
/***************************************/
void conv(void)						
{
if(deda>=20){deda=0;sec++;}
if(sec>=60){sec=0;min++;}
if(min>=60){min=0;hour++;}
if(hour>=24){hour=0;week++;}
if(week>7){week=1;}
}
/********************************************/
void main(void)				
{							
	init();					
	while(1)					
	{						
	conv();				
	}						
}