cs9-4.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};
//========================
void delay(uint k)		
{					
uint i,j;				
for(i=0;i<k;i++){			
for(j=0;j<121;j++)		
{;}}					
}					
//==================================
void main(void)			
{					
uchar a=0,b=0,i,dis_a,dis_b;		
while(1)				
	{	dis_a=SEG7[a++];
		dis_b=SEG7[++b];
		for(i=0;i<250;i++)
		{		
		P0=dis_a;	
		P2=0xfe;			
		delay(2);			
		P0=dis_b; 	
		P2=0xfd;			
		delay(2);
		}	
	if((a==9)||(b==9))while(1);
	}				
}