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本文首先介绍了Windows 9.x下的驱动程序,并阐述了虚拟机、保护模式的概念,然后对VxD的原理进行了说明。最后,介绍了两种开发VxD的工具。 相似文献
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文章主要研究了基于DSP的测试系统,通过快速以太网接口,采用基于IEEE802.3u标准的MAC子层协议,接入主计算机所在局域网的技术.重点介绍了如何用软件实现主计算机在win98下,通过虚拟设备驱动程序操作网卡收发MAC帧格式数据的方法. 相似文献
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本文介绍了Windows下虚拟驱动程序的概念,并阐述了以DMA方式实现数据采集的方法。通过实例,说明了DMA方式在实时控制系统中的应用。 相似文献
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基于虚拟仪器技术的CAT系统研究 总被引:7,自引:0,他引:7
本文从虚拟仪器技术的发展出发,介绍了一种实用性强、通用性好的基于虚拟技术的计算机辅助测试系统的系统结构、驱动程序接口模型和系统软件结构模型。 相似文献
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通用串口通讯驱动程序设计 总被引:1,自引:0,他引:1
陈莲娜 《中国计量学院学报》2000,11(2):196-200
工业现场数据采集软件通常要面对来自不同厂家使用不同协议的现场仪表和控制器 .为了使数采软件能够适应各种不同的协议 ,同时要保持其他模块的稳定性 ,文章提出了一种通用串行通讯驱动程序设计方法 .数采软件只需通过该通用驱动程序打交道而不需要了解任何有关仪表使用的具体协议 .文章分析了目前常用的两种不同的协议模式 ;介绍了 MODBUS通讯协议 ,该协议是通用驱动程序的实现基础 ;分析了通用串口通讯驱动程序的结构 ,最后给出了实现该通用串口通讯驱动程序 C++类 相似文献
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超声相控阵系统的数据传输速率很大程度上决定着其检测速度,因而在PCI总线的超声相控阵系统中,PCI驱动执行效率至关重要。详细阐述了利用Win Driver、Driver Studio和WDK(Windows Driver Kit)三种工具开发PCI驱动程序的方法及实现。在驱动效率和兼容性等方面上比较这三种不同的驱动开发方案。分析及测试结果表明,使用Driver Studio开发的驱动能够高速稳定地工作,满足超声相控阵系统对于数据传输速率和稳定性的要求。由于不同的应用有着不同的开发需求,提出根据特定的开发需求选择不同的开发方案,从而得到需要的驱动及其应用程序。 相似文献
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基于 PCI 总线的接口设计通过 PCI 接口控制芯片 S5933, 双端口 RAM 和可编程逻辑器件实现主机同各外围设备间的数据交换。用户应用程序调用利用 WinDriver 编程的设备驱动程序提供的各函数接口来操作硬件。 相似文献
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用VxD编写Windows95中断处理程序的方法 总被引:4,自引:0,他引:4
Windows95操作系统下的实时控制程序,分得用其孤图形界面等许多特性,但由于系统统一管理资源,利用Windows系统作实时控制的很少见。探讨利用虚拟设备驱动程序(VxD)技术提高Windows中断响应速度的方法,并提供有关测试数据,用此方法可在一定程度上实现了Windows95下的实时控制。 相似文献
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G W Mercer 《Accident; analysis and prevention》1987,19(3):231-236
A correlational examination of 84 consecutive months of data on the frequency and severity of passenger vehicle casualty traffic accidents, unemployment rates, drinking driving, restraint device use and the driver demographics of driver age and driver gender suggested the following: Increases in unemployment levels remove young male drivers from the driving population, which in turn reduces the frequency of drinking driving and increases the proportion of restraint device use in this population. These changes combine to reduce both the frequency of casualty accidents per million driven kilometers and the severity of these accidents. However, the apparent relationship between changes in restraint device use and the frequency and severity of casualty accidents, and the apparent relationship between changes in drinking driving and the frequency of casualty accidents can be, to a great extent, a function of unemployment-driven changes in driver demographics. 相似文献
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The effectiveness and performance of traffic control devices in school zones have been impacted significantly by many factors, such as driver behavioral attributes, roadway geometric features, environmental characteristics, weather and visibility conditions, region-wide traffic regulations and policies, control modes, etc. When deploying traffic control devices in school zones, efforts are needed to clarify: (1) whether traffic control device installation is warranted; and (2) whether other device effectively complements this traffic control device and strengthens its effectiveness. In this study, a generic approach is developed to examine and evaluate the effectiveness of various traffic control devices deployed in school zones through driving simulator-based experiments. A Traffic Control Device Selection Model (TCDSM) is developed and two representative school zones are selected as the testbed in Beijing for driving simulation implementation to enhance its applicability. Statistical analyses are conducted to extract the knowledge from test data recorded by a driving simulator. Multiple measures of effectiveness (MOEs) are developed and adopted including average speed, relative speed difference, and standard deviation of acceleration for traffic control device performance quantification. The experimental tests and analysis results reveal that the appropriateness of the installation of certain traffic control devices can be statistically verified by TCDSM. The proposed approach provides a generic framework to assess traffic control device performance in school zones including experiment design, statistical formulation, data analysis, simulation model implementation, data interpretation, and recommendation development. 相似文献