Usb Real-time Data Acquisition System Design And Realization

As an important branch of information technology, data acquisition studies on data acquiring, storing, processing, controlling and so on. It can be widely used in the field of virtual instrument, intelligent instrument, signal processing and so on. This thesis is based on a project that a company carry on to meliorate its products. To realise the easy and fast connection with the peripheral, so that to achieve the goal of providing convenience to users, reducing cost and expanding the extension of peripheral connected to PC, we design and exploit the real time data acquisition system based on USB.According to the designing requirement of the project, we discuss and confirm the whole design scheme of the system on the basis of study on USB protocol, as well as the key issues of the selection of control chip and transfer type and real-time data acquisition system software design. We put the emphasis on the detailed design of the firmware program, the USB driver program and the Windows application program.To evaluate the performance of the system, we do some practical measure and test. The result indicates that the system can realize real time data acquisition of the set instantaneous signal with accuracy of 12 bit, and it works steadily and reliably. So this thesis achieves the goal of developing an instantaneous data acquisition system, which has new characters of high function-price-ratio, powerful function, low power supply and easy use. The work of the thesis plays a promotive role in the product improvement project of the company.