cs15-4.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 uint unsigned int		
#define uchar unsigned char	
uchar code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar code ACT[4]={0xfe,0xfd,0xfb,0xf7};
void delay(uint k);				
//***********************************
enum week_day{mon=1,tue,wed,thu,fri,sat,sun};
enum week_day day;			
//************************************
void key_scan(void)			
{	uchar temp;				
	P3=0xff;					
	temp=P3;				
	if(temp!=0xff)				
	{						
		switch(temp)			
		{					
		case 0xfb:day=mon;break;
		case 0xf7:day=tue;break;
		case 0xf3:day=wed;break;
		case 0xef:day=thu;break;
		case 0xeb:day=fri;break;
		case 0xe7:day=sat;break;
		case 0xe3:day=sun;break;
		default:break;		
		}					
	}						
}							
//************************************
void main(void)				
{							
	for(;;)					
	{						
	key_scan();				
	P0=SEG7[day];			
	P2=ACT[0];				
	delay(300);				
	}						
}							
//***********************************
void delay(uint k)				
{							
uint data i,j;					
for(i=0;i<k;i++){				
for(j=0;j<121;j++)				
{;}}							
}