Write data from Micron Nand flash to pen drive via USB interface.

Hello everyone!

I am trying to execute a C code in Nios IDE to create a file in pen drive connected to Micron Nand flash via USB.

After running the program, file system is succesfuly initialized, USB host stack is also created and initialized.

Then I connect the pen drive and the message :

"Device connected. Device speed is full speed (12 Mb/s)" will be displayed.

Later an error : "USBH_DevDescRd: 3119, err = -4" appears.

I think this means that the device description is not being read successfully. Why is this happening? how to eliminate this error?

please help, any advice is welcome...