cs21-4.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
#define uint unsigned int
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[cnt];break;
case 1:P0=SEG7[sec/10];P2=ACT[cnt];break;
case 2:P0=SEG7[min%10];P2=ACT[cnt];break;
case 3:P0=SEG7[min/10];P2=ACT[cnt];break;
case 4:P0=SEG7[hour%10];P2=ACT[cnt];break;
case 5:P0=SEG7[hour/10];P2=ACT[cnt];break;
case 6:P0=0x00;P2=0xff;break;	
case 7:P0=WEEK_SEG7[week];P2=ACT[cnt];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 delay(uint k)			
{					
uint data i,j;			
for(i=0;i<k;i++){		
for(j=0;j<121;j++)		
{;}}					
}					
/**********************************************/
uchar scan_key(void)	
{					
uchar temp;
P3=0xff;			
temp=P3;				
if(temp!=0xff)		
   {delay(20);		
    temp=P3;			
  	if(temp!=0xff)return temp;
    }					
return 0;
}
/********************************************/
void main(void)			
{uchar key_flag;		
	init();				
	while(1)			
	{					
	conv();	
	key_flag=scan_key();			
	switch(key_flag)		
	   {					
	   case 0xfb:if(++min>59)min=0;delay(300);break;
	   case 0xf7:if(++hour>23)hour=0;delay(300);break;
	   case 0xef:if(++week>7)week=1;delay(300);break;
	   default:break;	
	   }					
	}					
}