这是个显示程序．清高手近来看看！
#include <reg51.h>
unsigned char code BCD_code[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
unsigned char code Bit_code[8] ={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
unsigned char buffer[8]={0xc0,0xc0,0xc0,0xc0,0xc0,0xa4,0xc0,0xc0}; //显示缓存数组;
//unsigned char phase1[4]={0x1,0x4,0x2,0x8};
//unsigned char phase1[4]={0xf1,0xf8,0xf2,0x0f4};       //clockwise phase;
//unsigned char phase2[4]={0xf1,0xf4,0xf2,0xf8};       //anticlockwise phase;
unsigned char phase1[4]={0xf3,0xf6,0xfc,0xf9};
unsigned char phase2[4]={0xf3,0xf9,0xfc,0xf6};
unsigned int  count1,count2;
unsigned char speed1,disp_bit,n_phase;
unsigned int speed2;
unsigned int totalcycle;                             //累计直流电机转的圈数；
unsigned char keyflag;
unsigned char speed1_bit,speed2_bit;
bit action,direction;

sbit P14=P1^4;
sbit P32=P3^2;
sbit P33=P3^3;
sbit P34=P3^4;
void scankey();
void display();
void keyfunc(void);
void update_buffer();

void initial_EA(void)
{
  TMOD=0x51;                          //T0定时，方式1，T1计数，方式1;
  TH0=0xF6;TL0=0x3C;

  TH1=0x0;TL1=0x0;
  EA=1;ET0=1;
  TR1=1;TR0=1;                        //启动T0，T1;
}

main()
{
  //unsigned int m;
  P1=0x0;                             //驱动电机
  P2=0x0;                             //位码
  P0=0x80;                            //段码
  action=1;                           //启动停止控制变量
  direction=1;                        //方向控制变量
  speed2=20;
  disp_bit=0;
  speed1_bit=0;
  speed2_bit=5;
  n_phase=0;
  count1=0;
  count2=0;
  totalcycle=0;
  initial_EA();
  ////////////

  while(1)
  {
    scankey();
    keyfunc();
  }
}

void scankey()                       //键盘扫描
{
   if(P32==0)                        //启动停止
   {
      while(P32==0);
          keyflag=0x1;               //action
   }
   else if(P33==0)
   {
      while(P33==0);
          keyflag=0x2;               //speed2加档
   }
   else if(P34==0)
   {
      while(P34==0);
          keyflag=0x4;               //speed2减档
   }
   else if(P14==0)
   {
      while(P14==0);
          keyflag=0x8;
   }
   else
          keyflag=0xff;
}

void keyfunc(void)                   //键盘处理程序
{
  unsigned char temp;
  switch(keyflag)
  {
      case 0x1:                      //启动跟停止
           if(action)
             {
              action=0;
              }
           else
             {
              action=1;
              }
                count2=0;
           break;
      case 0x2:                      //加速
          {
           switch(speed2)
           {
                case 1:
                     speed2=10;
                     break;
                case 10:
                     speed2=20;
                     break;
                case 20:
                     speed2=30;
                     break;
                case 30:
                     speed2=40;
                     break;
                case 40:
                     speed2=60;
                     break;
                default:
                     break;
           }
           /*temp=speed2;               //更新之前对temp和speed2_bit重新 赋值
           speed2_bit=4;
           while(temp/10!=0)          //更新速度缓冲区的值（speed2）
           {
                buffer[speed2_bit++]=BCD_code[temp%10];
                temp=temp/10;
           }
           buffer[speed2_bit]=BCD_code[temp];
           count2=0; */
           update_buffer();
           break;
         }
      case 0x4:
          {
           switch(speed2)
           {
                case 10:
                     speed2=1;
                     break;
                case 20:
                     speed2=10;
                     break;
                case 30:
                     speed2=20;
                     break;
                case 40:
                     speed2=30;
                     break;
                case 60:
                     speed2=40;
                     break;
                default:
                     break;
           }
           /*temp=speed2;
           speed2_bit=4;
           while(temp/10!=0)
           {
               buffer[speed2_bit++]=BCD_code[temp%10];
               temp=temp/10;
           }
           buffer[speed2_bit]=BCD_code[temp];
           count2=0; */
           update_buffer();
           break;
          }
      case 0x8:
           if(direction)
             {
              direction=0;
              }
           else
             {
              direction=1;
              }
              count2=0;
           break;
      default:
           break;
   }        //switch();
}

void test_speed()
{
  unsigned char temp1;
  speed1_bit=0;
  speed1=TH1*256+TL1;
  totalcycle+=speed1;                  //累加圈数；
  TH1=0x0;TL1=0x0;
  temp1=speed1;
  if(temp1==0)temp1=totalcycle;        //直流电机停止转动后就显示总的圈数；
  while(temp1/10!=0)
  {
       buffer[speed1_bit++]=BCD_code[temp1%10];
       temp1=temp1/10;
  }
   buffer[speed1_bit]=BCD_code[temp1];
   count1=0x0;
}

void drive_step()                    //驱动电机
{
    if(action==0)
       P1=0xf0;
    else
    {
      if(direction==1)
        P1=phase1[n_phase++];
      else
         P1=phase2[n_phase++];
      if(n_phase>3)
         n_phase=0;
      count2=0;
    }
}

void display()                        //显示速度
{
  if(speed1_bit+1==disp_bit)
     disp_bit=4;
  if(speed2_bit+1==disp_bit)
     disp_bit=0;
  P2=Bit_code[disp_bit];
  P0=buffer[disp_bit];
  disp_bit++;
  if(disp_bit>7)disp_bit=0;

}


void update_buffer()
{
  unsigned int temp;
  temp=speed2;
  speed2_bit=4;
  while(temp/10!=0)
  {
     buffer[speed2_bit++]=BCD_code[temp%10];
     temp=temp/10;
  }
     buffer[speed2_bit]=BCD_code[temp];
     count2=0;
}


timer0() interrupt 1 using 0           //定时2.5ms中断
{
 unsigned int drv_speed;
 TH0=0xF6;TL0=0x3C;
 count1++;
 count2++;
 display();

 if(400==count1)
 test_speed();

 drv_speed=120/speed2;                 //60000/(speed*48*2.5);
 if(count2==drv_speed)
     drive_step();
}

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