Research On Keyboard Quickly Input Information Technology Based On USB Protocol

With the development of PC science and USB hardware technology,the demand of human interface device such as keyboard,mouse and input handle is increasing day by day.However,as the most common peripheral input device,the single function USB human interface device has been unable to meet the demand.Therefore,in order to meet the needs of multi-functional information fast input,the research of USB composite device is becoming more and more important.The USB composite device can complete the enumeration and cooperation of USB human interface device only by one USB bus physical interface,and it greatly improving the efficiency and convenience of the information input.Therefore,it is very important to study the related technology of USB composite device.This paper describes the basic principles of USB HID communication protocols and basic principles,and analyzes the USB HID device enumeration interaction process and USB data packet structure and transmission process.On this basis,the PS/2 interface protocol and its communication timing logic are analyzed,and the master chip microprocessor and the overall scheme design are introduced in detail.Combined with USB HID communication principle,the hardware circuit is designed,and the design and implementation of USB HID composite device are described in detail,including enumeration process of the composite device and related program design.Then the fast input technology of information is described.The USB data packet is captured and simulated by Bus Hound simulation software.After that,the storage and update of quick input technology configuration information are explained,and the custom USB HID device is added on the basis of the composite device,which is the channel for the transmission and download of configuration information.Finally this paper introduces the interface design of computer terminal configuration information transmission software,through the library functions of the operation system,identification and communication on the specified USB device,data sending and receiving,sending and receiving and the results output to the screen of a computer software interface terminal,realizes the bidirectional communication USB HID composite device.