Study And Design Of Data Acquisition System Based On USB

Data acquisition technology is a synthetical application technology based on technologies of sensor, signal measure and disposal and computer, and it studies on data acquisition,memory, disposal and control, etc., it includes analog signals modulation, analog signals digitalization, digital signal processing and so on, so it is greatly useful. USB (Universal Serial Bus) technology is widely used because of the attributes of hot-plug-in, plus-and-play, engrossing less system resource. The USB2.0 has been paid much attention depending on the theory transfer rate of 480Mbps.Based on the research, the solution to the data acquisition system was put forward with the USB2.0 technology in the paper. With the analysis on the subject, the architecture of the USB was deeply analyzed firstly, and according to the scheme of the data acquisition system, the detailed hardware and software design was introduced. In the hardware section, the interface between the CY7C68013'GPIF (General Programmable Interface) and the A/D converter was introduced, and the various DC-DC circuit were embodied. In the software section, the"wave descriptor"and the whole communication process of CY7C68013 in the GPIF master mode were expounded; and the testing result of the firmware was listed at the end of the firmware part; Function driver is the bridge between hardware and host software, and the design process of the WDM (Windows Driver Mode) driver for the USB was introduced here; Finally the application software used to exhibit the curves and save data was designed, and the functions of the software were also explained.The data acquisition system based on the USB 2.0 technology has 14-bits resolution, single channel sample rate is 250KHZ, and the transform rate is 30Mbps. The system not only achieves the data acquisition, transforming and memory, but also has the attributes of hot-plug-in, plus-and-play, and man-pack. The expect result is achieved.