How to use FileSystemAPI.c

Hello DSPC
I want to read data from a FlashROM using FFS on BSP.
Is there any sample code for executing the functions in FileSystemAPI.c?
When I tried to execute aweOpenFile() with the following arguments, the function registered in "cbFlashRead" of the FFS instance was repeatedly executed and I could not proceed.

Instance initialization
-> "AWE Core 8 Integration Guide" for reference.

FFS Container
-> Register one "test.wav" in WaveLibraryGenerator.exe and write it to FlsahROM.

Argument of aweOpenFile()
-> 
    UINT32 nFileAttribute = 0; /* Read Mode */
    UINT32 fileName[14] = { /* test.wav */
            0x74736574,
            0x7661772E,
            0x00000000,
            0x00000000,
            0x00000000,
            0x00000000,
            0x00000000,
            0x00000000,
            0x00000000,
            0x00000000,
            0x00000000,
            0x00000000,
            0x00000000,
            0x00000000,
    };
    UINT32 fileLen;

    ret = aweOpenFile(nFileAttribute, fileName, &fileLen);

Best regards.
naomichi