usb_dev_bulk example make the program to be pend in while()

Hi, Everyone.

I'm using usb_dev_bulk example of OMAPL138_StarterWare_1_10_04_01 on my omap-L138 EVM Board.

It does work well in sending and receiving bulk data, but the problem is pended in while().

For example, i want to check a global variable in while() but as soon as i call USBDBulkInit() function, It is pended and It doesn't check this global variable anymore and i2c0 interrupt also doesn't work.

Is there anyone who can tell me how to solve this problem?

Thank You.