一种智能手机电源管理方案的设计与实现

叙述了一种以嵌入式Linux为操作系统的智能手机电源管理方案的设计原则、设计框架和实现要点.该方案在嵌入式Linux的基础上,针对智能手机软件环境复杂、对电源持续工作要求高的特点,设计和实现了从内核支持到应用程序的完整的电源管理软件框架.该方案与嵌入式图形运行环境的结合,使得电源管理的状态更容易监测、行为更容易控制;对硬件设计的讨论则体现了软硬件协同设计的思想.     

Implementation of the blit debugger

joff is an asynchronous, source-level, break-and-examine debugger for C programs running on the Blit, a programmable bitmap terminal, joff is implemented as two processes: a small process running in the terminal and a larger process running in a time-sharing host. The constraints on its design and a menu-driven user interface combine to present an unusual set of implementation difficulties. The way the problems were tackled and the degree to which they were solved may be interesting to those designing other debuggers. Operating system designers should assess the merits of a debugger that runs asynchronously with its subject and consider providing the necessary support.     

Computer Graphics and Man-Machine Interactions

During the past 10 years, there has been a considerable growth of interest in the problems of applying computer graphics techniques to practical use. This interest has created an increasing need for the applications of theoretical computer graphics methods to software and hardware systems that are cost-effective as well as user-oriented. A number of books have been published on the subject of computer graphics, and some rather cost-effective graphics devices have been designed and built for practical use. The latter has mainly been the result of microminiaturization technology of the last five years. Microprocessors, microcomputers, and microprogrammability have helped considerably in making cost-effective display devices a reality, the intelligence of such devices being limited only by the capability of the microprocessors. Applications of computer graphics have steadily increased in such areas as engineering, design, education, medicine/biomedicine, chemistry, business, analysis, computer-aided design, management, structural design, simulation, and communication.     

某型飞机液压能源系统原理验证试验系统设计

针对飞机液压能源系统设计的可靠性和合理性及获得更优质的液压能源系统设计方案的要求,需设计飞机液压能源系统原理验证系统,通过半物理仿真对设计原理进行了验证。描述了试验系统的设计思想和总体结构,叙述了液压试验台架的设计思想,阐述了各个子系统结构与原理,重点分析了飞机流量压力负载模拟模块的设计思想和控制策略,同时对飞机高温环境进行了模拟,给出了试验系统的软件硬件设计思想和方案以及调试结果。工程调试结果表明,该系统设计达到了设计要求,对飞机液压能源系统设计具有重大意义。     

基于Qt的移动机器人上位机软件设计与实现

为了实现移动机器人运行过程状态数据的可视化,以面向对象的C++编程语言,设计了一款基于跨平台的Qt图形库框架的上位机监测软件。该软件对接收到的状态数据进行解码、分离并绘制移动机器人实时运行轨迹和状态信息波形曲线等功能。首先概述了自行设计搭建的移动机器人硬件平台的结构和原理以及软件的实现流程;然后简要介绍了上位机软件的开发环境,并阐述了软件的各项功能以及其设计与实现过程;最后以移动机器人路径跟踪运动控制作为实验对象,验证了所设计上位机软件的有效性。     

Atmega16单片机在智能水表系统上的研究

为了实现对居民用水预付费的需求,提出了一种基于Atmega16智能IC卡水表设计方案,并完成系统的软硬件设计.该系统的硬件部分主要用来控制智能水表阀的开闭,随后介绍了系统软件设计原则以及控制流程.实际应用表明,该系统具有可靠性强、功耗低、精度高等特点,达到了设计要求.     

龙芯2号同时多线程处理器的软硬件接口设计

随着生产工艺的提高,芯片上能集成越来越多的晶体管,多线程技术也逐步成为一种主流的处理器体系结构技术,而多线程处理器的软硬件接口也就成为急需解决的问题.在分析同时多线程的软件需求的基础上,提出龙芯2号同时多线程处理器的软硬件接口协同设计解决方案,给出相应的操作系统实现方案.同时,在Linux 2.4.20的基础上实现了龙芯2号同时多线程处理器相应的操作系统.通过运行SPEC CPU2000等测试程序进行性能评测,充分说明实现软硬件接口的龙芯2号同时多线程处理器极大地提高了多进程负载的性能.分析和设计方案不仅适用于同时多线程处理器,而且对于片内多核处理器的设计也有借鉴作用.     

Computer graphics and computer aided design in mechanical engineering at the University of Minnesota

Engineering design in industry is changing as a result of the application of the new tools provided by the digital computer and interactive computer graphics. This shift is placing new demands on engineering curricula. The engineering graduate today must be trained in the use of the computer and computer graphics as a design tool—in much the same way that engineers in the past used the slide rule and today use the hand-held calculator.This paper summarizes the efforts to integrate computer graphics and computer aided design into the design curriculum in the Mechanical Engineering Department at the University of Minnesota. Specific software packages have been developed for use in teaching engineering graphics and mechanism synthesis and analysis. These packages are discussed in detail, including the hardware used.     

Window clipping methods in graphics accelerators

How some recently introduced graphics accelerators address window clipping is discussed. Some graphics accelerators can download the window-clip rectangle data structures used to represent the visible areas of a window to specialized RAM or hardware registers. These accelerators have special hardware and/or software to hold the clipping information and to properly clip graphics primitives. Others use window clip planes, which allow easy hardware representation of windows with arbitrary shape and complexity. They are ideal for clipping graphics output to nonrectangular windows because graphics output performance does not degrade as the number of rectangles needed to represent the window increases. CPU-based window clipping is examined. Devices in each of these classes are described     

基于核电管道评估系统的硬件与故障诊断设计

以核电管道评估系统为对象,对其核心部分硬件系统的故障诊断与控制设计进行了研究。利用程控放大、幻象供电、故障诊断等电路设计了硬件调理模块。通过Keil软件对STM32芯片嵌入式软件编程的方式实现了硬件系统的控制与故障诊断功能,并由设计的串口通信协议经RS232与软件系统通讯。通过Labview软件开发了硬件自动化测试平台和故障诊断监测程序,保证硬件系统可靠性的同时提升了测试效率并减少了人力成本。设计的硬件控制与故障诊断模块满足要求,已成功应用在出口国外某核电厂的管道评估系统中,为核电厂安全经济可靠地运行提供了保障。     

ARINC429总线采集器的设计和开发

设计了一种新型ARINC429总线采集器,描述了硬件的基本原理和结构以及驱动软件的开发思路,阐述了ARINC429总线接口、智能控制以及PCI接口的电路设计.     

三维造型设计与工程图学的有效融合

随着计算机软硬件技术的普及和飞速发展以及制造业对二维计算机绘图以及三维设计造型技术日益增长的需求,在工程图学教学中有效地融入二维计算机绘图以及三维设计造型技术已显得尤为重要。论文介绍了北京理工大学在工程图学和三维造型创新设计方面“外挂式、分段式和融合式”三种模式的教学改革实践,并着重对如何将三维造型设计与工程图学有效地融合进行了论述。     

基于SOPC及图形加速引擎的座舱显示系统

提出一种基于可编程片上系统和图形加速引擎的飞机座舱综合显示系统设计方案。为避免图形加速引擎直接对帧存储器进行零碎操作导致的存储器操作瓶颈,引入图形缓存机制。根据图形像素的存储特点提出“远区域优先”图形缓存页面淘汰算法。对汉字及自定义位图等操作采取软硬件结合的方式达到系统性能和资源利用的平衡,利用硬件锁保证帧存储器一致性。通过对模块进行波形仿真实现系统级仿真结果的可视化验证。     

3D technology, ready for the PC?

3D graphics software is computationally intensive, but the hardware is getting cheaper. Suitable motherboard-bus and graphics card developments are discussed, as are ways of overcoming network-bandwidth limitations. The article then considers applications-games and entertainment, design, presentations, and virtual shopping; one can even make a virtual representation of oneself to try on virtual clothes before ordering them. Finally, the development of standards in formats and in players for distribution is discussed     

低成本的STC单片机的导航授时系统设计

针对国内导航系统与授时系统的发展现状,将两个系统合理地结合在一起并以STC12C5A单片机作为整个系统控制单元,设计出的导航授时服务系统成本低、功耗低。给出了系统的硬件设计和软件流程,同时介绍了上位机软件的模块化设计思想。经过测试,该系统可以在户外或室内对运动的载体实行导航定位,当系统结合计算机运行时能对计算机进行授时...     

XGA高分辨率彩色图形卡的设计

ＸＧＡ高分辨率彩色图形卡是一种智能型图形适配器。本文对ＸＧＡ图形卡的功能和设计方法作了详细介绍。我们设计的基本图形卡有多种配件作图功能，彩色种类为１６Ｍ，实现的ＸＧＡ适配器接口则以汇编和Ｃ两种方式供用户调用ＸＧＡ的绘图功能使用。     

继电保护硬件平台测试软件一体化设计

根据不同的应用需求,继电保护硬件平台外围功能设备上会存在一定的差异.为解决硬件平台测试软件通用性差、重复设计问题,设计了一种基于配置文件的测试软件架构,采用层次化、模块化的设计思想.此方法提高了测试软件的通用性、可扩展性,实现了测试软件结构的一体化.本文对软件架构的各组成部分,包括配置文件、嵌入式测试软件及上位机软件等进行了详细介绍,并对软件的使用方法举例说明.目前该测试软件在MPC8309硬件平台测试中取得了良好的效果,并且方便移植和应用到其他硬件平台测试中.     

ARD3T智能电动机保护器PROFIBUS-DP通讯模块设计原理

本文介绍ARD3T智能电动机保护器的PROFIBUS-DP通讯设计原理,文中介绍了常用PROFIBUS芯片,本设计所选芯片的类型,PROFIBUS模块的硬件原理框图、电源电路、软件流程图、GSD文件等相关设计原理,本文通过力控组态软件与ARD3T进行PROFIBUS连接完成数据读写,通讯成功说明设计的可行性。     

基于32位微处理器的液晶显示系统设计与实现

提出了一种基于摩托罗拉32位微处理器MC683332的液晶显示系统设计方法。首先介绍了图形液晶显示控制嚣SED1353及其接口原理，设计了MC68332、SED1353和LM64P83L之间的接口电路，对系统的I／O地址空间、硬件环境进行了有效配置。最后以该系统控制犬规模点阵液晶显示屏LM64P83L为例，阐述了系统的初始化及汉字显示的程序设计思想，给出了程序清单。该方案对解决32位嵌入式微处理器应用中显示带宽不足的问题提供了一种有效方法，具有良好的应用前景。