基于ARM和VxWorks嵌入式系统软件设计技术

基于S3C44B0X ARM7处理器和VxWorks操作系统,对无线数传装置进行了设计.该系统由核心处理器板、LCD、键盘、数字信号处理器件、声码器等组成.软件设计的结构和主要内容包括编制BSP程序启动并加载VxWorks、主控程序等.在设计过程中采用片上资源丰富的ARM处理器和具有高效的实时任务调度和中断管理的强实时操作系统VxWorks.本文主要从几个关键主题描述S3C44B0X VxWorks BSP定制工作.     

μClinux下S3C44B0X的中断实现

在嵌入式系统中,中断的处理是必须的.本文阐述了μClinux下S3C44B0X的中断实现过程,并实现了S3C44B0X开发板的按键中断驱动程序.将μClinux移植到开发板后,中断得到正常响应,中断服务程序正确运行.     

基于S3C44B0X微处理器的VxWorks BSP开发与设计

SAMSUNG公司的S3C44B0X微处理器是众多嵌入式手持设备和高性能微控制器的首选。该微处理器配合主流的实时多任务操作系统VxWorks,可以满足大多数嵌入式手持设备和高性能的低功耗和高可靠性的要求。文中阐述了基于ARM7TDMI核S3C44B0X微处理器,介绍基于该处理器的实时操作系统VxWorks BSP(Board Support Package)的开发与设计过程,并给出了实现的部分具体源代码。     

嵌入式非矢量中断研究

以S3C44B0X处理器为例,详细介绍嵌入式非矢量中断的原理,调用过程以及使用C语言具体实现嵌入式非矢量中断调用,对于理解嵌入式中断机制有较大的参考价值.     

基于S3C44B0X的Bootloader的设计与实现

介绍一种利用GNU工具链开发基于S3C44B0X硬件平台的Bootloader的方法,详细分析了Bootloader的构架、内存分布、异常/中断处理以及编译链接过程,说明了Bootloader需要完成的主要任务和实现方法。     

S3C44B0X嵌入式系统

本文主要讲述了三个方面内容:第一,由于S3C44B0X没有地址重映射功能,本文讨论并设计了一个程序以实现这种伪"重映射";第二,μC/OS-Ⅱ在移植到S3C44B0X嵌入式系统时,实现了时钟中断函数OSTickISR的C语言编写;第三,基于S3C44B0X的嵌入式系统设计过程中一些要点的总结.     

基于S3C44B0X微处理器的VxWorks BSP开发与设计

SAMSUNG公司的S3C44B0X微处理器是众多嵌入式手持设备和高性能微控制器的首选。该微处理器配合主流的实时多任务操作系统VxWorks，可以满足大多数嵌入式手持设备和高性能的低功耗和高可靠性的要求。文中阐述了基于ARM7TDMI核S3C44B0X微处理器，介绍基于该处理器的实时操作系统VxWorksBSP（Board Support Package）的开发与设计过程，并给出了实现的部分具体源代码。     

S3C44B0X系统实用功能的拓展与提升

S3C44B0X没有地址重映射功能,程序在Flash中运行较慢,且运行时不能实现Flash程序的更新,限制了其在业界的广泛应用.针对S3C44B0X的不足,提出一种将位于NOR Flash中的程序复制到SDRAM中并正确跳转执行的方法;通过对中断过程的分析,采用C语言编写μC/OS-II时钟中断函数OSTickISR,克服以往该中断函数因由汇编语言实现而给其他中断函数的编写所带来的不便,并设计一个中断函数书写的通用方式,为应用程序的开发提供方便.     

基于S3C44B0X的I2C总线设计

文章介绍了S3C44B0X的I2C总线接口,与EEPROM的连接方法.重点分析了I2C总线的配置方法,主器件模式下发送数据和接收数据的软件设计,提供了I2C中断处理的源程序.     

S3C44B0X平台上μC/OS-II的中断系统设计

中断是嵌入式系统的重要组成部分.通过对三星ARM7处理器S3C44B0X中断控制系统和嵌入式实时操作系统μC/OS-II中断管理机制的分析,进行嵌入式中断系统设计.此系统包含IRQ中断和FIQ中断.经过实验验证,该方法同样适用于其他嵌入式中断系统的设计.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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