/*----------------------------------------------------------------------

	File:        inout.c

	Description: Samples signal from line-input and redirect to 

		     line-out. Uses on-board codec and mcbsp0.

	 -----------------------------------------------------------------------*/



#include <stdio.h>

#include <string.h>

#include <common.h>

#include <board.h>

#include <stdlib.h>

#include <mcbspdrv.h>

#include <intr.h>

#include <regs.h>



#define SAMPLING_RATE 44100



extern int inicodec (int sampling_rate);



interrupt void isr_rint0 (void)

{

	int sample;



	sample = MCBSP0_DRR;

	MCBSP0_DXR = sample;

	

	return;

}



void Init_Interrupts ()

{

	intr_reset();                     // Reset the interrupt system,

					  // disable all interrupts.

	INTR_CLR_FLAG (CPU_INT15);        // Clear previous interrupt request

	INTR_ENABLE (CPU_INT15);          // Enable cpu interrupt line 15

	intr_map(CPU_INT15,ISN_RINT0);    // Link receive interrupt of serial

					  // port 0 to interrupt line 15.

	intr_hook (isr_rint0,CPU_INT15);  // Assign the interrupt service routine

}



void main(void)

{

	evm_init();                        // Initialise EVM board.     

	inicodec (SAMPLING_RATE);         // Initialise codec, adjust sampling rate. 

	Init_Interrupts ();               // Initialise interrupts and hook isr.

	INTR_GLOBAL_ENABLE();             // Enable global interrupt.



	for (;;);                         // Main loop, does nothing.

}