C Programming with Audio IP Cores

[Altera_Forum]

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; } } }

[Altera_Forum]

Anyone Can Help Me To Find Tutorial For C/c++ Nios Language. 

I Can't Interface My Accelerator To Avalon Bus; Because I Dont Know The Instructions To Access In Different Bus . I Wait Your Help .