Usb Bus-based Data Acquisition System Design

Universal Serial Bus is a new specification for microcomputer bus interface. With the continuing advance of the clients' demand for the speed of a data collection system, USB is more and more widely used in data collection system for its advantages such as convenience, expanding port with ease and high speed etc.This article presents a particular description of the design and development of a data collection system based on USB.single chip programs the fireware to the USB interface chip—CH372; communication appears between CH372 and up-location computer and man-machine mutual interface comes into being; lots of data from the industry spot are printed, analyzed and disposed on time. On the base of wonderful understanding to USB protocol and device truss, I finish the hardware design and software programme of the data collection system. And draw the principle chart. The system has 16 single-ended analog input, 32-way switch (16 input and 16 output), 16-way DA, 8 pulse input, full-featured.The software programme mainly includes: the fireware code in need of CH372's maximum transmission rate; USB device driver and client application under the circustance of Windows XP operation system in computer. After this data collection system,we can understand the USB protocol profoundly and apply the interface chip-CH372 proficiently. In all, the advantages of this interface technique may helps to your design arrangement.The experiments show that the system fully inherited the convenience of USB bus installation, high-bandwidth, easy to expand, etc., and full-featured, easy to use.