Stepper motor forward and reverse adjustable speed

//=================================
//P3^0; forward and reverse
//P3^1; speed increase
//P3^2;
deceleration //P3^3; stop

#include
#define uint unsigned int 
#define uchar unsigned char
sbit rl=P3^0;//forward and reverse
sbit add=P3^1;//speed increase
sbit sub=P3^2;//deceleration
sbit stop=P3^3;//stop
uchar num1,num2,flag1,flag2,flag3,n;
uchar code table1[]={0x08,0x0c,0x04,0x06,0x02,0x03,0x01,0x09};//forward table
uchar code table2[]={0x09,0x01,0x03,0x02,0x06,0x04,0x0c,0x08};//reversal table
  //motor rotation table
void delay(uint z);
void keyscan();
void main()
{ uchar i;
     n=50;
    TMOD=0x01;
      TH0=(65536-10000)/256;
     TL0=(65536-10000)%256;
     ET0=1;
     EA=1;
     TR0=1;
 while(1)
     {
       keyscan();
      if(!flag3)
      { if(flag1==1)
  {flag1=0;
          if(flag2==0)
         P1=table1[i];
           else
           {P1=0;
           P1=table2[i];}
     i++;
         if(i>8)
           i=0;
        }
    }
 }
   

}
//========================
void delay(uint z)
{
   uint x;
   uchar y;
 for(x=0;x  for(y=0;y<100;y++);
}
//====================
void timer0() interrupt 1
{   
  TH0=(65536- 10000)/256;
     TL0=(65536-10000)%256;
        num1++;
       if(num1==n)
       {num1=0;flag1=1;}
     
}

//================
void keyscan()
{
 if(rl==0)
     delay(10);
 if(rl==0)
      {
  while(!rl);
       flag2++ ;
        flag3=0;
        if(flag2>1)
   flag2=0;
   }
   if(add==0)
      delay(10);
    if(add==0)
      {
  while(!add);
        n=n++;
  if(n> 80)
  n=80;
   }
 if(sub==0)
      delay(10);
    if(sub==0)
      {
  while(!sub);
        n=n--;
  if(n<10)
  n=10;
   }
 if(stop==0)
      delay(10);
    if(stop==0)
      {
  while(!stop);
        P1=0;
        flag3=1;
   }
}