This paper presents a new software and hardware design for USB interface extending in the image transmission system.Data transmission of physical layer and data link layer is managed by the USB2.0 interface chip CY7C68001,which is controlled by TMS320VC5502 DSP chip.The software is designed to implement USB device enumeration,data read-write and interrupt processing.The bulk transfer mode is adopted,which makes the system communicate with PC at a high speed.A friendly graphical interface is provided for the users of the Windows system during image transmission.It is of good value to be referenced for other system interface extending to some extent.
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