| Infrared, simply called IR, is one type of wireless communication mode, wireless transmission can not only used in processing data , but also replaced the old mode of complex cable connections.Through its developing history past more than twenty years, IR that invented in 1974 now became the most stable transmission technology.At the same time, the introduction of USB on external interface technique, acts as a major change on the basic structure of the classical computers. The existence of the USB in the computer results on the following properties ,easy usage to the end-user ,broadly applicable ,predominant free-error capability ,best performance/price ratio, etc, convenience of adding external hardware, adoption of modern computer's multimedia development, as a consequently it became the popular interface of a computer.The main purpose of this thesis is to research and develop an USB-IrDA adapter system with the combination of USB technologies and IrDA interface technologies. This kind of adapter system could be applicable in the communications of devices with IrDA interface such as mobile phone, PDA, etc., and supports all the features of USB interface such as plug and play (PnP).The main research scope of this thesis, concerns of hardware circuit design, MCU assembly language, driver programming technologies, etc.Firstly the thesis introduced USB interface protocol and IrDA interface protocol which are the mainly theories and technologies needed in the implement of the system. Then, it brought forward the main frame of the circuit for the system and analyzed the implement of hardware circuit and designing method of driver program for the adaptor in details.
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