cs10-2.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	
sbit KEY_S1=P3^2;			
//====================
void delay(uint k)			
{					
uint i,j;				
for(i=0;i<k;i++){		
for(j=0;j<121;j++)		
{;}}					
}					
//====================	
void main(void)			
{					
	delay(50);			
	while(1)			
	{				
	if(!KEY_S1){P1=0x00;}		
	else {P1=0xff;}		
	delay(5);			
	}				
}