SD Card read fails on NIOS2 DE2 Board

Hi,

I am having a similar problem when trying the example software provided in the University program PDF i.e.

printf("Insert the SD Card \n");

device_reference = alt_up_sd_card_open_dev(SDCARD_INTERFACE_NAME);

if (device_reference != NULL)

{

while(1)

{

if((connected ==0) && (alt_up_sd_card_is_Present()))

{

printf("SD Card Connected. \n");

if(alt_up_sd_card_is_FAT16())

{

printf("FAT16 file system detected!!! \n");

....

Each time I debug the program, the function alt_up_sd_card_is_Present() always return 0. In Altera_UP_SD_Card_Avalon_Interface.c the pointer *aux_status_register value is 0x01 which leads to 0 in the operation *aux_status_register & 0x02.

What I don't understand is why this pointer has that particular value?

I know the SD Card is well formatted because I can run the DE1_SD_Card_Audio example.