C Programming with Audio IP Cores

I am trying to take an inputted Audio file and trying to save it to the SDRAM (ie recording a word said into a microphone to the memory).

My system uses a DE2 board with a Nios II Processor and Quartus 7.2 software.

The Nios II system uses the University program's audio codec IP cores.

I have created a C program using the functions provided by the audio core (found on the Altera website), but am having trouble saving an audio stream to the memory and then playing it back.

Below is my code and any help you could provide would be greatly appreciated.

Thanks,

Mel

# include <Z:\try3\app_software\include\alt_up_audio.h>

# define Switch (volatile char *) 0x01001020

# define MAX_DATA 4096

int main()

{

unsigned len[2000];

alt_u32 audiobuf[128]; //audio buffer

alt_u32 audiostream[MAX_DATA]; //for audio storage

unsigned index= 0;

int ii,jj,NUM=0;

// Switch 0 should be off for playback

alt_up_audio_reset_audio_core(); //initiating the Audio Core

while(1){

if ((*Switch) & 0x01){ // if Switch 0 is on, read data in through

microphone

len[NUM] = alt_up_audio_read_left_channel(audiobuf,128); //array of

lengths stored for playback

if((index + len[NUM]) < MAX_DATA){ // check for data overflow

for(ii = 0; ii < len[NUM]; ii++){

audiostream[ii+index] = audiobuf[ii]; //saving all the data to an

array for playback

}

index = index+len[NUM++];

}

}

else if((*Switch) & 0x02){ // if Switch 2 is on, playback data to

line-out

index = 0;

for (jj = 0; jj < NUM; jj++){

alt_up_audio_write_left_channel(audiostream+index,len[jj]);

alt_up_audio_write_right_channel(audiostream+index,len[jj]);

index=index+len[jj];

}

NUM = 0;

}

}

}