/* My C program run by C-52 EVB */ 

#include <reg51.h>                /* special function register declarations   */
                                  /* for the intended 8051 derivative         */

#include <stdio.h>                /* prototype declarations for I/O functions */
#include <math.h>

unsigned char tick;


/**********************************/
/* Your Interrupt Service Routine */
/**********************************/

void timer0int (void)  interrupt 1  using 1  {
	TH0 = 0xdc;
	TL0 = 0x00;
	tick++;
           
}

   
/*********************/
/* Your main program */
/*********************/
void main (void)  {
  /* the setting of the STACK area is performed in the file STARTUP.A51,
     so you need not to worry about this here */

        float n;
	int i;
	i=0;
        n=1.0;
       	EA = 1;
	ET0 = 1;  // or IE |= 0x82;   /* set bit EA and Timer0 enable */ 
	TMOD |= 0x01; /* timer 0 run 16 bit counter */
        TR0 = 1; //or TCON |= 0x10; /* run timer 0 */
  while (1) {
	while (tick <50)
	;
	tick = 0;
        P1 ^= 0x80; // XRL P1,#0x80, i.e., toggle P1.7
        printf("\n Hello World %d sin(%f) = %f",i++,n,sin(n));
        n += 0.001;
     
  	}
}