cs12-1.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};
sbit P3_2=P3^2;			
uchar number1,number2;		
//=======================
void swap(uchar x,uchar y);
//=======================
void delay(uint k)		
{					
uint i,j;				
for(i=0;i<k;i++){		
for(j=0;j<121;j++)			
{;}}						
}				
//=======================
void main(void)			
{							
uchar a=3,b=8;				
	while(1)					
	{
		if(!P3_2)
		{				
		swap(a,b);	
		P0=SEG7[number1];
		P2=0xfd;				
 		delay(1);			
		P0=SEG7[number2];	
		P2=0xfe;
		delay(1);
		}
		else			
		{number1=a;number2=b;	
		P0=SEG7[number1];
		P2=0xfd;				
 		delay(1);			
		P0=SEG7[number2];	
		P2=0xfe;
		delay(1);
		}
		
	}				
}						
//=======================
void swap(uchar x,uchar y)	
{						
number1=y;				
number2=x;				
}