【作者】 吴东艳；

【导师】 张礼勇；

【作者基本信息】 哈尔滨理工大学 ， 测试计量技术及仪器， 2005， 硕士

【摘要】 随着计算机技术和信号处理技术的飞速发展,使已经提出多年的虚拟仪器逐步走向现实。本文以基于USB 总线的数据采集/信号发生器的研制过程为主要内容,阐述了以其实现虚拟仪器的具体方案。本文首先介绍了USB 总线技术的相关内容,并在此基础上采用USB1.1 协议和美国国家半导体公司的USBN9604 接口芯片完成了全速USB 设备接口的开发,实现了通用计算机与测试设备之间基于USB 总线的通信功能,同时,又深入的研究了USB2.0 规范,并将其要点与USB1.1 协议进行了比较分析,采用Cypress 公司的CY7C68013 接口芯片设计了USB2.0 设备接口,完成了硬件设计及控制程序的固件设计。其次,选用了美国Cygnal 公司的新型单片机C8051F007 作为核心控制器,利用其内部的12 位A/D 和D/A 转换器,开发了基于USB 总线的数据采集/信号发生器。该设备具有体积小、功耗低、USB 总线供电的优点,对激励信号的运算和采集信号的处理都由通用计算机来完成;充分体现了虚拟仪器的通用性和灵活性。最后,主机应用程序通过调用API 函数,使用操作系统内置的HID 驱动程序和HID 类设备进行通信,测试软件在此基础上完成了面向用户接口的USB 设备接口测试仪、虚拟数字示波器和信号发生器。所设计的数据采集/信号发生器是构建虚拟仪器时不可缺少的硬件组成部分,实践表明,以其实现的虚拟仪器性能优良,使用灵活、价格低廉。更多还原

【Abstract】 The virtual instrument gradually turns into reality since it’s first been taken into consideration with the rapid development of the technologies of the computer and data processing. This article is mainly about the design of the data acquisition and signal generator base on USB bus. It is about a specific case of realizing the virtual instrument. This article first tells of the contents of the technologies of the USB bus, and use USB1.1 protocol and the USA’s National Semiconductor’s USBN9604 interface chip to complete the production of high-speed USB interface device. It makes the communication between PC and testing devices based on USB bus available. In the mean time, study the USB 2.0 criterion, and compare it with the USB 1.1 criterion thoroughly. And used the Cypress company’s CY7C680133 interface chip to made a device interface on USB 2.0 criterion, including the hardware and the controlling program. Secondly, I use the internal 12 bits A/D and D/A convertor in the Cygnal company’s new microchip C8051F007 as a core to develop the data acquisition/signal generator based on USB bus. It has the characteristics of small in size, low in power, and powered by the USB bus. The computing of the excitation and the processing of the collected data are all completed by the PC. And it makes full use of the universality and flexibility of the virtual instrument. Finally, the computer uses the embedded HID driver programs to communicate with the HID class devices by using the API functions. The software completes the design of the user-oriented USB interface testing instrument, virtual digital oscilloscope and the signal generator. The designed data acquisition/signal generator can hardly be missed in setting up a virtual instrument. The facts have proved that the virtual instrument base on that has the advantages of good performance, wide application and cheaper prices.更多还原