原创 电机控制的问题

还请各位大虾帮忙看看程序,控制3个电机转动的,但为什么，只有其中的一个能动呢,帮忙看看啊.

/************************************************************/
/*               x y s 轴转动
/*bu_x        bu_y        bu_s       xys_fp         dl
/*x最大步数   y最大步数   s最大步数  xys轴减速倍数  延时倍数
/*x_fp=2时，X转速=原速/1.5 , x_fp=3时，X转速=原速/2
/************************************************************/
void siba_xys(int bu_x,int bu_y,int bu_s,uchar x_fp,uchar y_fp,uchar s_fp,uint dl)
{
    uchar xfp,yfp,sfp;
    if(x_fp==0)x_fp=1;
    if(y_fp==0)y_fp=1;
    if(s_fp==0)s_fp=1;
    xfp="x"_fp;yfp=y_fp;sfp=s_fp;
    while(bu_x|bu_y|bu_s)
    {
     ///////////////////////////////////////////////  x  ( P0 低4位  )
      if(bu_x!=0)
      {
        xfp--;
        if(xfp==0)
        {
         if(bu_x>0)  ///正转
         {
          if(x_sd==0) siba_x01=siba_x01<<1;  else siba_x02=siba_x02<<1;
          if(siba_x01==0x10) siba_x01=0x01;
          if(siba_x02==0x10) siba_x02=0x01;
          x_sd=~x_sd;      //单双相选择标志
          bu_x--;
          }
         if(bu_x<0)   ///反转
         {
          if(x_sd==0)siba_x02=siba_x02>>1;  else siba_x01=siba_x01>>1;
          if(siba_x01==0x0) siba_x01=0x08;
          if(siba_x02==0x0) siba_x02=0x08;
          x_sd=~x_sd;      //单双相选择标志
          bu_x++;
          }
         xfp="x"_fp;
        }
       }
///////////////////////////////////////////////  y  ( P0 高四位  )
      if(bu_y!=0)
      {
        yfp--;
        if(yfp==0)
        {
          if(bu_y>0)  ///正转
          {
            if(y_sd==0)siba_y01=siba_y01<<1;  else siba_y02=siba_y02<<1;
            if(siba_y01==0x0) siba_y01=0x10;
            if(siba_y02==0x0) siba_y02=0x10;
            y_sd=~y_sd;      //单双相选择标志
            bu_y--;
           }
          if(bu_y<0)   ///反转
          {
           if(y_sd==0) siba_y01=siba_y01>>1;else siba_y02=siba_y02>>1;
           if(siba_y01==0x08) siba_y01=0x80;
           if(siba_y02==0x08)siba_y02=0x80;
           y_sd=~y_sd;      //单双相选择标志
           bu_y++;
           }
          yfp="y"_fp;
        }
       }
///////////////////////////////////////////////  s  ( P2 高四位  )
       if(bu_s!=0)
       {
         sfp--;
         if(sfp==0)
         {
          if(bu_s>0)  ///正转
          {
           if(s_sd==0)siba_s01=siba_s01<<1;  else siba_s02=siba_s02<<1;
           if(siba_s01==0x0) siba_s01=0x10;
           if(siba_s02==0x0) siba_s02=0x10;
           s_sd=~s_sd;      //单双相选择标志
           bu_s--;
           }
          if(bu_s<0)   ///反转
          {
            if(s_sd==0)siba_s02=siba_s02>>1;  else siba_s01=siba_s01>>1;
            if(siba_s01==0x08) siba_s01=0x80;
            if(siba_s02==0x08) siba_s02=0x80;
            s_sd=~s_sd;      //单双相选择标志
            bu_s++;
            }
          sfp="s"_fp;
          }
         }
 //////////////////////////////////////////////////
     mada_xy=siba_x01|siba_x02|siba_y01|siba_y02;        //P0
     mada_s=siba_s01|siba_s02;                           //P2
     delay01(dl);       //调用时，没有 "参数" 会出错~~~~
     }