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c program for rotating stepper motor to particular angle in 8051 microcontroller

Sir, i am using stepper motor of 2 degree step angle. I m using following c program:

 #include<reg51.h>
   void main()
  {
        while(1)
        {       void delay (int);
                P1=0xCC;
                delay(1);
                P1=0x66;
                delay(1);
                P1=0x33;
                delay(1);
                P1=0x99;
                delay(1);
        }
        }
        void delay(int a)
                {
                unsigned int x,y;
                 for(x=0;x<10;x++)
                 for(y=0;y<a;a++);
                                  }

But i want to rotate it to 80 degree only. I want to stop motor at 80 degree.
Please give me the c program for this....??

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