步进电机八拍demo 

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#include<reg51.h>          //包含51单片机寄存器定义的头文件
sbit P17=P1^7;             //电源上电控制

unsigned char RUN[8] = {0xf1, 0xf3, 0xf2, 0xf6, 0xf4, 0xfc, 0xf8, 0xf9}
unsigned char FFZ[8] = {0xf9, 0xf8, 0xfc, 0xf4, 0xf6, 0xf2, 0xf3, 0xf1}//反转
unsigned char P2_REG=0; 

void delay(void)            //延时程序
{
unsigned int i;
for(i=0;i<2000;i++);
}

void run(unsigned char *p)  // 电机运行
{
unsigned char i;
for(i=0;i<4;i++)
   { P1=p[i]; delay(); }
}

void stop(void)             //步进电机停转
{
P1=0xFF ;                       //步进电机停转
}

void main(void)
{
P2=P2_REG=0x70;                 //键盘状态单元
P17=0;
while(1)
   {
   if(P2!=0x70)             
      {
	  delay(); 
      if(P2!=0x70)
	     {
         if((P2&0x70)==0x60)     //K0
            {		 
		    while((P2&0xF0)!=0x70); 
		    if ((P2_REG&0x10)==0) P2_REG = 0x70; else P2_REG = P2_REG&0x60;
            P17=~P17;
			}
         if((P2&0x70)==0x50)     //K1
		    {
		    while((P2&0x70)!=0x70); 
		    if ((P2_REG&0x20)==0) P2_REG = P2_REG|0x20; else P2_REG = P2_REG&0x50;
		    }
         if((P2&0x70)==0x30)     //K2
		    {
		    while((P2&0x70)!=0x70); 
		    if ((P2_REG&0x40)==0) P2_REG = P2_REG|0x40; else P2_REG = P2_REG&0x30;
			}
		 }
	  }
   switch(P2_REG)
      {
      case 0x00:  run(RUN); break;
      case 0x20:  run(FFZ); break;
      case 0x60:
      case 0x40:  stop();   break;
      }
   }
}