Problem in creating a custom SOPC device driver

Hi.

I found this in system.h :

/*

* dcfifo_de_top_0 configuration

*

*/

# define DCFIFO_DE_TOP_0_NAME "/dev/dcfifo_de_top_0"

# define DCFIFO_DE_TOP_0_TYPE "dcfifo_de_top"

# define DCFIFO_DE_TOP_0_BASE 0x00400000

# define DCFIFO_DE_TOP_0_SPAN 4

# define DCFIFO_DE_TOP_0_TERMINATED_PORTS ""

# define ALT_MODULE_CLASS_dcfifo_de_top_0 dcfifo_de_top

This corresponds to my custom SOPC component. So, I tried this: I modified the DE2_NET project main function (from Altera DE2_NET development board) by adding this following code:

unsigned int i;

FILE* fp;

char buffer[10] = {0};

fp = fopen("/dev/dcfifo_de_top_0", "r");

if (fp == NULL)

{

printf ("\nCannot open file");

exit (1);

}

fread (buffer, 10, 1, fp);

fclose (fp);

for(i=0; i<sizeof(buffer); i++)

{

printf("\nbuffer[%d] = %d", i, buffer[i]);

}

I build the project, but when I run it, console show this:

Cannot open the file.

So, it seems that fp keeps on pointing to NULL (because cannot open the file).

The question is: Am I doing anything bad??

Thanks again!!!!