A Data Acquisition System Based On USB Bus

Data acquisition is an important branch of information technology. It studies data acquisition, data storing, data processing and so on. It can be widely used in the field of virtual instrument, intelligent instrument and so forth.At the same time as the Windows2000 operation system supports the USB specification comprehensively, the application of USB is going ahead by leaps and bounds. This paper just focus on how to development a simple data acquisition system based on USB.Firstly, this paper introduces the USB 1.1 specification, especially focusing on the transfer type and bus protocol of USB. Then it introduces the way to build up a data acquisition system (both hardware and software), and this system use PDIUSB12 as the USB interface chip, AT89C52 as the Microprocessor, and ADC0809 as the A/D convert chip.Secondly, it introduces the overall structure, every module's function and its character of the WDM driver. At last, combined with the practice of the author in developing a USB device, this paper presents how to develop a USB device by using a USB interface chip, how to build a WDM driver based on USBDI, and how to work out the communication between them.At last, it introduces the problem of GUID and multi-threaded when programming the data acquisition system's application software.Connecting data acquisition device to USB, sufficiently taking the advantage of USB, it must be a new direction of data acquisition system.