get_key.c

单片机控制的步进电机 不是很完善 但是能实现基本功能

#define	uchar	unsigned char
#define	uint	unsigned int
#include	<reg52.h>
uchar GetKey(void)
 	{	uint 	i=0;	
		uchar 	keybuf=0;
		if(P1!=0xff)
     		{
				keybuf=P1;
				if(keybuf!=0xff)
     				{
						while((P1==keybuf)&&(i<0x6000))	i+=1;			
     					if(i>101)             
        					{ return keybuf;}  
      					else return 0;
					}
				else return	0; 					
      		}		
	else	return 0;	
	}