基于 LCC的嵌入式处理器 C语言编译器研究

介绍了一种为T RIC快速开发高级语言编译工具的方法．LCC是一个小型的可变目标C语言编译器,通过扩展LCC后端使其支持硬件中断等嵌入式C语言语法特性,进而实现 T RIC的C语言编译器．经测试验证,此方法可大大降低移植LCC的难度和出错的概率,且能快速开发出目标处理器的编译工具．     

MATLAB中M-文件的编译和优化

MATLAB 是美国MathWorks 公司推出的一个非常优秀的数学软件，它具有很强的数值计算能力和卓越的数据可视化能力。但在MATLAB5 及以前的版本中，并没有提供对其M -文件进行编译和创建外部应用程序的工具，从而大大限制了它与其他应用程序的结合和应用。在MATLAB 最新的5 .2 版本中，增加了MATLAB 编译器以及C/C++Math 库，它们与C/C++编译器一起对M-文件进行编译，生成相应的C或C++源代码及二进制的MEX-文件。通过MATLAB编译器和C 或C++的编译器来完成链接，可以得到独立于M A T L AB 之外的应用程序。1 、编译M-文件…     

HI-TECH推出盛群单片机C语言编译器

盛群单片机除了自行开发完整的HT-IDE3000开发系统,现在亦有知名C语言编译器厂商HI-TECH,正式推出支持盛群全系列单片机的C语言编译器。偕同现有的盛群H T-IDE3000(V6.5版本)开发系统,提供客户更多的产品开发工具选择。HI-TECH提供的C语言与ISO/ANSI C兼容,支持所有数据类型,包括8、16、32位整数与24、32位浮点数,产生高效能最佳化程序代码,自动化管理程序页与数据区块。对于原本使用盛群C Compiler编译的源程序,仅需少许语法修改后,即可使用HI-TECH C编译器重新编译。www.htsoft.comHI-TECH推出盛群单片机C语言编译器…     

与编译器开发商密切合作优化微控制器开发

微控制器开发团队与编译器开发人员的合作成果是生成的代码效率更高，性能更好。本文介绍的是为了使ATMELAVR微控制器系列更适合C编译器，开发者在编译器开发阶段对微控制器架构和指令集所进行的调整。     

Java与C/C++的编译器优劣探讨

Java与C/C++的编译器是目前非常流行的编译器,JAVA是即时编译器,C/C++是静态编译器。无论是什么代码,最终编译的目的码都是二进制机器码,所以编译器好坏的比较最后就是"拼编译器"的好坏。文章就两个编译器的运行,通过多种多样的参数比较来看看这两种语言的编译器各有哪些优缺点,从而引起大家的兴趣来进一步探讨和研究JAVA和C/C++。     

BWDSP100集成开发环境设计与实现

本文实现了DSP集成开发环境的设计和开发,完成了面向BWDSP100应用系统的开发,包括源代码的编辑、编译、链接、调试等一系列功能。原理是用交叉编译器编译链接源代码,形成目标代码,通过ICE实现下载功能,并通过远程调试器实现源代码级调试。     

编译系统中间代码的一种抽象表示

中间表示是提高编译器的可移植性和代码生成的有效性的关键技术.为提高编译成份的可复用性,简化编译器的构造,本文提出了一种描述程序语言抽象语法及编译器内部数据结构的抽象中间表示AIR(Abstract Inter-mediate Representation).AIR以代数数据类型为主体,并用面向对象特征对其进行扩展,从而使之具有简洁的语法,较强的表达能力、灵活性和可扩展性.AIR将抽象描述与其具体实现相分离,可方便地用不同的高级程序语言实现,从而有助于提高编译成份间的互操作性.     

基于OpenCL框架的并行编译系统设计

针对自主设计的面向图形图像应用的16核阵列并行处理器PAAG(polymorphic array architecture for graphics and image processing),讨论在PAAG机器上的并行编译问题。提出使用OpenCL框架解决目前在PAAG平台上开发并行软件困难的问题。选择LLVM作为OpenCL框架中的OpenCL编译器,为LLVM移植PAAG后端。设计了PAAG任务加载器进行任务映射,指令修正,处理PAAG独特的通信指令。对内置OpenCL函数进行了优化,减少了函数调用开销。经实验证明本编译系统可正常工作。     

电子设计工程师认证实操实训基础系列讲座(4) 第二讲 EDP电子工程实训的软件开发(中)

<正> 三、Keil C51开发流程与方法1.Keil C51软件的开发流程简介与其它单片机与嵌入式系统开发工具一样,基于Keil平台的软件开发过程一般包括以下几个步骤:(1)新建工程,配置工程选项,包括目标器件、编译器环境等;(2)编辑源程序文件,通常采用C语言或者汇编语言;(3)编译或者汇编源程序;(4)链接并生成编     

GCC编译器生成代码中的C++对象模型分析

本文对GCC编译器编译C++程序时使用的对象模型进行了讨论,重点分析了GCC实现C++对象模型过程中采用的相关数据结构和算法。本文的分析可以帮助程序开发者及C++编译器的设计者理解GCC编译器中C++对象模型的实现机制,或在C++程序安全分析领域帮助开发者设计C++程序安全模型。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first