/************************************************************************/
/*	TALKTHRU.C         Written by: Jerry Lenaz,  12/21/92           */
/*                         Revised by: Matt Begg,    1/5/93             */
/************************************************************************/
/*      This is a talkthru program written entirely in C to be used     */
/*      with the ADSP-21020 EZ-LAB board.                               */
/*                                                                      */
/*	This talkthru program defines the port addressses for the	*/
/*	particular input and output channel being used, sets up the	*/
/*	IRQ3 interrrupt to call the talkthru routine, and sets up	*/
/*	an idle wait loop to conserve power while waiting for the	*/
/*	interrupt.							*/
/************************************************************************/
#include <21020.h>    /* For the idle() command */
#include <signal.h>   /* For the interrupt command */
#include <macros.h>   /* For the segment function */

volatile int in_port1 segment(hip_reg0);  /* Microphone Left  */
volatile int in_port2 segment(hip_reg1);  /* Microphone Right */ 
volatile int out_port1 segment(hip_reg2); /* Speaker Left  */
volatile int out_port2 segment(hip_reg3); /* Speaker Right */
volatile int control_0 segment(hip_reg4); /* Control 0 */

void timer_isr (int interrupt_number);
void process_input(int);
void irq2_interrupt(int);

void main(void)
{ 
  timer_set(6250000, 6250000);
  interrupt(SIG_TMZ0, timer_isr);
  interrupt(SIG_IRQ3, process_input);
  interrupt(SIG_IRQ2, irq2_interrupt);

  timer_on();

  while (1)
  {  
    idle();
  }
}

void process_input(int sig_number)
{
  float i1 = in_port1;
  float i2 = in_port2;
  out_port1 = 2 * i1;
  out_port2 = 2 * i2;
}

void irq2_interrupt(int sig_number)
{
control_0 = 0x3F00;
}

void timer_isr(int interrupt_number)
{
    set_flag(SET_FLAG1, TGL_FLAG);
}