通用串行总线USB(Universal Serial Bus)是一种新型的微机总线接口规范。随着客户对系统数据采集速度要求的不断提高，USB以其使用方便、易于扩展、速度快等优点而越来越多的应用于数据采集系统中。本文介绍了一种基于USB总线的数据采集系统的设计方法，采用PHILIPS公司的USB接口芯片PDIUSBD12与单片机AT89C51进行通信，并和PC机通信而编制出友善的设备应用程序。该系统用传统的USB总线取代了RS232串行总线，通过对USB协议和设备构架的充分理解，对以单片机89C51和USB接口芯片PDIUSBD12为主的数据采集系统进行了硬件设计和软件编程，并在此设计的基础上给出相应的原理图。硬件设计主要解决的是PDIUSBD12和ADC0809与单片机之间的接口电路问题，软件编程大致分为三部分:一是为满足D12在USB上的最大传输速率而编写的固件程序;二是在PC机中的Windows 2000工作环境下编写USB设备驱动程序;三是充分了解D12的主要功能特点，并编写出应用程序。通过该数据采集系统，我们可以对USB协议有很深刻的理解，对D12接口芯片有很熟练的应用，能更好领悟USB接口的优势。

 

关键词：USB总线；单片机；数据采集；固件；Windows驱动程序模型；设备驱动程序；客户应用程序

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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—PDIUSBD12; communication appears between D12 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 software programme mainly includes: the fireware code in need of D12's maximum transmission rate; USB device driver and client application under the circustance of Win2000 operation system in computer. After this data collection system,we can understand the USB protocol profoundly and apply the interface chip-PDIUSBDI2 proficiently. In all, the advantages of this interface technique may helps to your design arrangement.