#include <reg51.h>       //51芯片管脚定义头文件
#include <intrins.h>     //内部包含延时函数 _nop_();
#define uchar unsigned char
#define uint  unsigned int
sbit  K1=P1^4;
uchar code FFW[8]={0xf1,0xf3,0xf2,0xf6,0xf4,0xfc,0xf8,0xf9};
//uchar code REV[8]={0xf9,0xf8,0xfc,0xf4,0xf6,0xf2,0xf3,0xf1};
uchar rate ;        
/********************************************************/
/*                                                  
/* 延时
/* 11.0592MHz时钟，                                    
/*                                                      
/********************************************************/
void delay()
 {                           
   uchar k;
   uint s;
   k = rate;
   do
   {
    for(s = 0 ; s <1000 ; s++) ;        
   }while(--k);
 }
/********************************************************/
/*
/*步进电机正转
/*
/********************************************************/
void  motor_ffw()
 { 
   uchar i;
 
    for (i=0; i<8; i++)     //一个周期转30度
    {
      P1 = FFW[i];        //取数据
      delay();            //调节转速
    }
 }
/********************************************************
*                                                       
*步进电机运行                                               
*                                                      
*********************************************************/
void  motor_turn()
{ 
   uchar x;
   rate=0x0a;
   x=0x80;
   do
     {
      motor_ffw();          //加速
      rate--;
     }while(rate!=0x01);
   do
     {        
       motor_ffw();        //匀速
       x--;
     }while(x!=0x01);
     
   do
     {
      motor_ffw();         //减速
      rate++;
     }while(rate!=0x0a);    
}
/********************************************************
*                                                       
*  主程序                                               
*                                                      
*********************************************************/
main()
{       
   P1=0xf0; 
   while(1)
  {
    P1=0xf0;
    if(K1==0)
    {
      motor_turn();
    }
  } 
}