【作者】 李广辉；

【导师】 朱六妹；

【作者基本信息】 华中科技大学 ， 材料加工工程， 2007， 硕士

【摘要】 随工业环境越来越复杂,现场工程师对工业现场设备监控仪器的便携性、数据传输的速度和可靠性要求越来越高。针对这种情况,本文充分利用USB总线的即插即用、数据传输可靠性和高速等特点,配合DSP强大的控制与数字信号处理功能,设计了一种新型的便携式数据采集系统解决方案,并将其应用于焊接过程。本文主要完成了数据采集与传输单元、USB固件程序、USB驱动程序、PC机信号显示与处理四大部分任务。在数据采集与传输方面,采用DSP自带高速ADC模块,实现了分辨率10位,采样速率可达2MHz的高速采样。通过扩展USB控制芯片,实现了与PC机53MByte/s的高速数据传输,从而使数据采集系统变得更加便携易用。在USB固件程序方面,采用完全中断驱动的方式完成了设备枚举和数据采集。CPU处理前台任务时,USB的传输可在后台进行。确保了最佳的传输速率和更好的软件结构,同时简化了编程和调试。在USB驱动程序方面,利用DriverWorks开发环境,它以面向对象的思想完全封装了DDK(Device Driver Model)的所有库函数,通过Driver Works提供的类,轻松地编写出USB驱动程序,与采用传统的DDK相比,大大缩短了驱动程序开发周期。在PC机应用程序方面,动态显示模块采用多线程技术和高速数据转储的形式实现了高速大量数据实时显示和保存,较好地解决了在Windows平台上实现高速、大量数据实时显示时所出现的丢失数据、屏幕刷新等问题。静态分析模块结合Matlab提供的编程接口实现了算法复杂的小波分析。依据“计算机软件”即是仪器的思想,使本系统完全具备了虚拟仪器的特点。本课题研究和设计了USB技术在数据采集与PC通讯系统的应用,并给出了一套可行的整体开发解决方案。更多还原

【Abstract】 The conditions around the machines in the industry field become more and more complicated. The requirement is increasing to make those monitoring and controlling instruments simple and ease of use from the field engineers. To satisfy the demands, with the benefits of USB, such as ease of use, true plug and play, high speed transmission and dependability, this paper provides a new resolution of portable virtual instrument system with USB and DSP(Digital Signal Processor)which has powerful control system and high speed data processing ablity.The main tasks of the paper go as follows: data acquisition and transmission, USB firmware design, USB driver design and application software design on PC.In data acquisition and transmission unit, the paper adopts AD module of DSP, making the system has 10 bit resolution and 2MHz sampling speed. It also realizes 53MByte/s data transmission to PC by expanding USB control chip. Thus the data acquisition system becomes more convenient and easier to be used.In USB firmware design unit, the paper adopts complete interrupt mode to accomplish the enumeration of USB device and A/D conversion. USB transmission is processed in backstage of CPU,while CPU is processing the missions of proscenium. Thus the optimal transmission speed and excellent structure of software are guaranteed.In USB dirver design unit, the paper uitilizes the developing environment of DriverWorks which encapsulates the library of DDK(Device Driver Kit) by the idea of OOP.(Oriented Object Programme) . USB device driver can be easily developed with the classes which are provided by DriverWorks. Compared to DDK, the period of development of driver is greatly shortened.In the application software unit, to realize high speed and mass of data real time display and store, dynamic display module introduces the programming technology of multi-thread and high speed data transforming. The problems of data loss, screen update is resolved preferably. By combining the extern interface of Matlab, static analyzing module accomplishs complicated arithmetic data analysis, such as denoising and characteristic pick-up by wavelet. According to the theory of“software is just virtual instrument”, the whole system absolutely has the characters of virtual instrument.This M.S. degree project’s main task is to research & develop the use of USB tech in data acquisition and PC communication system, and provide a whole doable solution.更多还原