基于USB接口的数据采集器设计.doc

基于Abstract As the demand to data acquisition is more and more high in modern industry field, the traditional method which mainly makes use of data acquisition card has not adapted to the high requirement of modern data acquisition because of the low transmission speed、incovenient installation、weak ability of anti-jamming and other problems. USB(Universal Serial Bus) has many advantages, such as high transmission speed、sustaining hot plug and few transmission lines. So the application of USB in data acquisition can be the solution of the deficiency of traditional data acquisition, and it will has widely application value. Aiming to the need of high speed data acquisition, we design a data acquisition based on USB in this paper. The design work of this system consists of hardware design and software design.In hardware design, the AT89C5131 MCU of ATMEL company is apllied as microcontrollers to receive digital datas converted from A/D. Meanwhile,the USB controller in the MCU can realize the USB data communication between MCU and PC. The main difficulty in the design work is the software design. The design of firmware program、USB drive program and user program are included in the software design. The firmware program is developed through the software of Keil C, and the USB diver program is generated automatically by DriverWorks and modified appropriately; Through the designof firmware program and USB drive program, the MCU can be identified as USB slave device by the host PC, and the datas collected can be transmitted to PC by USB data wire. The user program of PC is developed by VC++, and the USB data acquisition interface is designed by MFC to display the wave form of the datas collected. In the end of this paper, we test the system, and the wave forms of the inputting random signals can be displayed on the data acquisition interface designed. The practice workndicates that the design work has received initial success, and the USB dataacquisition function can be reali