Net2272 on a usb chip loopback procedure, slightly modified, can be transplanted to your mcu or dsp on

Packet : 5956498usb_loopback.rar filelist
USB_Loopback
USB_Loopback\comm_command.h
USB_Loopback\loopback.c
USB_Loopback\loopback_533.dpg
USB_Loopback\loopback_533.dpj
USB_Loopback\loopback_537.dpg
USB_Loopback\loopback_537.dpj
USB_Loopback\loopback_537.mak
USB_Loopback\loopback_537.pcf
USB_Loopback\loopback_561.dpg
USB_Loopback\loopback_561_corea.dpj
USB_Loopback\loopback_561_coreb.dpj
USB_Loopback\main.c

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