/*****************************************************************
 * sinewave.c - main for sinewave example
 * Illustrate a simple use of the real time interrupt mechanism
 ****************************************************************/
#include "includes.h"
#define COUNTT 2
volatile int count = COUNTT;
int list[]={1,4,6,7,7,6,4,1,-1,-4,-6,-7,-7,-6,-4,-1};
int phase = 0;
							
void main(void)  {
  int done = 0, lub;

  RTICTL  = 0x81; // setup the RTI timer to minimum delay
  PORTDLC = 0x00; // initialize port register
  DDRDLC  = 0x04; // set pin to output
  CLI();          // enable I-class interrupts

  while (!done){
  
    // determine current output
    lub = (phase >> 12)&0x0F;
    PORTDLC = list[lub];
    
    // update the phase
    phase = (phase + 1)&0xFF;
  
    DelayGate();
  }
}

/********************************************************
 * DelayGate
 * Wait for some time
 *******************************************************/
void DelayGate(void)
{
  while (count > 0);
  count = COUNTT;
}


/********************************************************
 * An ISR for the real time clock
 *******************************************************/
#pragma TRAP_PROC
void RtiIsr(void)
{
  RTIFLG = 0x80; 
  --count;
}