/*EISINE.C - SINE WITH 4 POINTS USING EXTERNAL INTERRUPT  */
#include "aiccomc.c"             /*AIC comm routines      */     
int AICSEC[4] = {0x162C,0x1,0x4892,0x67}; /*AIC data      */
int data_out, loop = 0;   /*declare global variables      */
int sin_table[4] = {0,1000,0,-1000}; /*values for sinewave*/
int ampt_ctrl = 10;
int delay_cnt = 0;

void c_int10()
{
  if (delay_cnt < 500)
      delay_cnt++;
  else if (delay_cnt == 500)
  {
      asm("    AND     0FFFFFFF7h,IF");    /*set INT3 = 0 */
      asm("    OR       00000008h,IE");    /*set EINT3 = 1*/   
  }
  else asm("    OR       00000008h,IE"); 
}

void c_int04()
{
   asm("    AND    0FFFFFFF7h,IE");        /*set EINT3 = 0*/
   delay_cnt = 0;
   if (ampt_ctrl < 10)
      ampt_ctrl++;
   else ampt_ctrl = 0; 
}

void c_int05()                            
{
 int out;
 out = sin_table[loop] * ampt_ctrl * 0.1;
 PBASE[0x48] = out  << 2;   /*output value from sine table*/
 if (loop < 3) ++loop;      /*increment loop counter < 3  */
 else loop = 0;             /*reset loop counter          */
}                                                                       

main()
{
 PBASE[0x38] = 0x000030D4;  /*set timer 1 period          */ 
 PBASE[0x30] = 0x000003C1;  /*set timer 1 control register*/
 asm("    OR       00000208h,IE"); /*enable EINT3 & ETINT1*/
 AICSET_I();                       /*configure AIC        */ 
 for (;;);                         /*wait for interrupt   */
}