Research On The Data Acquicition And Processing Based On USB

Universal Serial Bus (USB) nowadays has been used widely for the peripheral equipment, digital device and the scientific instrument field due to such advantages as Plug and Play, flexible expandability and the high speed on transmitting. And Digital Signal Processor (DSP) has been applied in industrial control and instrument filed because of its powerful ability of data control and processing. Thus, combining USB and DSP is an effective solution to data collection with high speed as well as processing and transmitting.On the basis of comprehensive research about USB Specification, a system possessing the characteristics of data collection with high speed, processing and transmitting is designed. This system depends on the main control of DSP to fulfill data collection with preprocessing, high rate transmission by USB and the final data processing in computers. The specific content of studying is listed as follows:The theory and the specification of USB are well understood. Also, its electrical quality and bus topology are mastered as well as the differences among the four data flow types that consist of data pattern, transmitting direction, the capacity limitation of data pocket, and the bus interview confinement The design and test of hardware circuit with USB interface are finished.Designed with DSP chip TMS320F240 as a main controller and USB chip ISP1581, the circuit thoroughly embodies the advantages of DSP, especially its powerful capability in controlling, fast data computing and addressing with vast volume. In addition, it also embodies the high date-transmission speed of USBSoftware design consists of writing the firmware program of USB controller and developing drive program based on Windows Operating System. The firmware code is used for the device initialization, configuring and servings for interrupt in transmitting. The purpose of the drive program based on Windows is to provide an automatic examination and recognition for USB equipment and to guarantee normal functions.Complete the design of application program and study the data processing algorithm on the ground of accurate diameter measure applying to small...