Research And Design Of Data Acquisition System Based On USB

With the development of information technology and electronic technology , computers and other electronic devices also develop fast and be applied widely.Data acquisition technology is used in the science research field and lots of manufacture occasion which require every parameter of data acquisition higher and higher.Traditional communications style is strongly restricted the development of data acquisition devices because of slow transmitting rate,weak anti-jamming ability,inconvenient installation and so on .New generation Universal Serial Bus has the advantages of small transmission line,quick transmitting rate,sustaining hot-plug and pull, easy extensibility and so on which solved the problems of traditional communications style well.So Universal Serial Bus technology gains wide applications in the computer system and communications devices.This thesis analyzes system configuration and characteristics of Universal Serial Bus .Aiming at the shortages of traditional bus, it puts forward the system of data acquisition based on USB.This system has the advantages of quick transmitting rate, plug and play, convenient taking and so on.The whole system contains two parts that are hardware design and software design.It realizes functions of data acquisition , data transition, data saving, data display and data printing.The hardware of the system realizes data acquisition founction, which sends data to the USB controller, and then USB controller sends data to PC by USB interface. The hardware design mainly includes the periphery circuit design of the USB2.0 controller(CY7C68013 ),the connection between the CY7C68013 and the high speed A/D TLC5540 and the power supply design. Each chip is choosed based on the technology index in the hardware design, and the ports communicate acorrcording to the mode of the chips and the system function. The paper descrip the reasons to choose the chips and the principle chart of the hardware connection.The software of system includes USB firmware programme, device driver programme and the user programme. The USB firmware programme is accomplished in keilC, realizing the initialization of CY7C68013; The device dirver programme provides the channel to the software and the hardware platform for the user programme, which is developed by WindowsXP DDK and DriverStudio; The user programme finishes with VB Language, operating the hardware device through calling the handle of drive function in VB, and realizes the data receiving, saving, diaplaying and printing functions.Lastly, it tests the system using the function generator as the object.The system performs well from the testing results, reaching the expect effects.