de2_115 audio core

hi dear members,

i make a simple project on DE2_115 board.It record sound and play it.But sound is very dirty.my c code is :

#include

<stdio.h>

int

i=0;

#include

"altera_up_avalon_audio.h"

int

main(void)

{

alt_up_audio_dev * audio_dev;

/* used for audio record/playback */

unsigned

int l_buf;

unsigned

int r_buf;

// open the Audio port

audio_dev = alt_up_audio_open_dev (

"/dev/audio");

if

( audio_dev == null)

printf(

"Error: could not open audio device \n");

else

printf (

"Opened audio device \n");

/* read and echo audio data */

{

// read audio buffer

alt_up_audio_read_fifo (audio_dev, &(r_buf), 1, ALT_UP_AUDIO_RIGHT);

alt_up_audio_read_fifo (audio_dev, &(l_buf), 1, ALT_UP_AUDIO_LEFT);

// write audio buffer

alt_up_audio_write_fifo (audio_dev, &(r_buf), 1, ALT_UP_AUDIO_RIGHT);

alt_up_audio_write_fifo (audio_dev, &(l_buf), 1, ALT_UP_AUDIO_LEFT);

&#12288;

}

}