Because of the obvious disadvantages of traditional digital signal processor such as poor expandable capability and a much higher price , we have designed pc _ based digital signal processing instrument , according to the principle of digital signal processing and methods of computer 传统的数字信号处理仪存在着功能可扩充性差、性能价格比低的缺点。为此,本文根据数字信号处理理论以及计算方法的相关原理,开发出一套在通用计算机上实现数字信号处理功能的测试分析系统。
Embedded processors dorminate the keyboard , mouse , disk driver , hard disk , display , network card , modem , sound card , printer , scanner , digital camera and usb hub , etc . in the fields of control , communication , instrument , automobile , shipping , aeronautics , military , and consumable , embedded computer is a master 一台通用计算机的外部设备上就包含了5 - 10个嵌入式微处理器,键盘、鼠标、软驱、硬盘、显示器、显示卡、网卡、 modem 、声卡、打印机、扫描仪、数字相机、 usb集线器等均是由嵌入式处理器控制的。在工业流水线控制、通讯、仪器仪表、汽车、船舶、航空航天、军事装备、消费类产品等领域更是嵌入式计算机的天下。
This paper first begin with the connotation of virtual instrument technology , study and discuss the criterion and the working theory of usb deeply . on the principle of usb1 . 1criterion , using usb interface chip usbn9604 and low consumption mirochip c8051f231 , we designed the available interface of usb bus and its controlling software , turn the communicating function based usb bus between computer and testing device . second based on the developed interface of usb bus , using microchip pic16c62 and a mount of relays , we designed the multiswitching scanner and its controlling software to complete the funtion of accesses swithing in testing system . third calling the api function inside the windows using vb programming language , communicat with the impelling program of selected hid , achieve the function of testing instrument with usb interface , complete the development of upside software faced testing . at last , based on the deep studying of pcb testing method , used the developed multiswithing scanner and software faced testing , combinated with necessary testing instrument , we constructed the pcb testing system and analized the testing result simply 论文首先从虚拟仪器的技术内涵出发,深入研究和讨论了通用串行总线usb规范及工作原理,并依据usb1 . 1规范,采用usb接口芯片usbn9604和低功耗微处理器c8051f231设计开发了通用的usb总线接口及其控制固件,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;其次,在所开发的usb总线接口的基础上,使用微处理器pic16c62和多路继电器开关,设计开发出实现测试系统中测试通道切换功能的多路通道扫描器及其控制固件;再次,采用vb语言编程,调用windows内部api函数,与选定hid类驱动程序进行通信,实现usb总线接口测试仪器功能,完成面向测试的上层软件开发;最后,在深入研究印刷电路板测试方法的基础上,利用已开发的多路通道扫描器和面向测试软件,结合必要测试仪器组建印刷电路板测试系统,并对测试结果进行了简要的误差分析。
Currently the people use the general computer to link network each other . at the same time , various appliances > pda > apparatus and instrument > data collecting and control equipment in the industry manufacture are gradually linking with the network to share vast information resource in the internet 在使用通用计算机进行网络互联的同时,各种家电设备、 pda 、仪器仪表、工业生产中的数据的采集与控制设备正在逐渐走向网络化,以便共享互联网络中庞大的信息资源。