Design Of A Control System Based On USB Interface

The Universal Serial Bus (USB) is a new kind of interface technology which is widelyapplied in the field of microcomputer. Since the windows98operation system supportedthe USB interface in computer, USB has gradually entered the practical stage and becomesone of the most important developments in PC peripheral interconnecting technology. Andit is more and more used in data transmission because of its convenience, expansibilitiesand fast speed.In this dissertation, a control system for communication is designed based on USB bus.We choose Philips’ chip-PDIUSBD12to control the interface and correspond withsinglechip STC89C52RC. In addition, the thesis also gives the specific realization scheme.Firstly, the protocol of USB bus is introduced briefly, and then the hardware design andsoftware programming of the whole system are discussed. In hardware section, theperformance of PDIUSBD12is described, and the interface circuit of PD12and singlechipMCU is given out. The software programming includes three sections，firmware, devicedriver and application program. The firmware (including several modules) programming isintroduced and some codes are given out. In device driver section, the IDE (integrateddevelopment environment) for programming and the developing steps of WDM drivermodel are introduced. The application program is designed to access the driver. It mainlyprovides a friendly user interface to communicate between PC and peripherals.In the end，a conclusion is drawn to highlight the advantages of USB, and a prospect ismade on the extension of USB functions.