DSP28335嵌入式系统的SCI在线编程方法实现

为了解决嵌入式系统主流控制器DSP28335程序升级维护不便、成本高的问题,提出了一种通过异步串行通信接口SCI向片内FLASH在线编程的方法。将特定的GPIO引脚状态配置为SCI引导模式,DSP芯片上电自检后调用BootLoader中的SCI_Boot函数,将烧写控制程序通过SCI口下载到片上SARAM,然后调用API功能函数将用户程序固化到FLASH。实验结果表明,该方法有效可行,简单方便,可脱离JTAG仿真器进行操作,提高了传输距离,降低了成本。     

C240X系列DSP定点数学函数库的应用

定点DSP在做浮点运算时效率不高,影响了定点DSP的应用.TI公司推出针对C24X系列DSP的qmath数学函数库,用定点算法优化实现了常用的一些数学函数.本文介绍了该数学函数库的使用方法和要注意的问题,并在相同硬件条件下进行了执行定点函数和浮点函数的对比实验,结果表明合理使用定点数学函数可以显著提升C语言DSP程序的执行效率,对定点DSP应用系统的高级语言开发有很大帮助.     

关于用C语言检查内存驻留问题的研究

本文叙述了使用C语言系统提供的调用外部程序的函数来解决检查内存驻留程序是否驻留的问题.     

基于DSP的实时跟踪系统的软件优化策略

由于TMS320C6000系列DSP具有独特的超长指令字(VLIW)结构,芯片硬件功能能否充分发挥很大程度上依赖于软件的执行效率.因此,在用DSP进行实时跟踪系统的设计时,软件的执行效率将直接影响系统的实时性.笔者深入研究了基于DSP的视频跟踪系统中软件优化的方法,包括编译器选项的设定、DSP关键字和内联函数的使用、数据打包处理以及软件流水技术.利用这些方法对系统的软件进行优化,解决了系统在处理过程中实时性差的问题,从而提高了整个系统的稳定性.     

MATLAB环境中基于微机并口的多通道数据采集系统设计与实现

介绍在MATLAB环境中基于IBM PC微机并口的可编程8位8通道数据采集系统，该系统具有易于制作、使用方便等特点，可应用于各种低频信号的数据采集工作中．用C语言编写用于端口访问的程序，在MATLAB中编译为动态链接库函数，通过调用该动态链接库，可实现对硬件端口的操作．利用该方法测绘了铅和蜡的散热曲线．     

DSP多路同步数据采集板设计

介绍基于DSP的同步采集与处理系统。分析并给出设计思想及原理框图．该分析内容包括DSP板卡中DSP存储空间的具体配置,CPLD在DSP数据采集与处理系统中的逻辑控制方法,DSP片上串口与PC机RS232串行通讯的方法,以及DSP与虚拟仪器相结合,采用虚拟仪器进行DSP辅助信息处理的方法．     

基于Matlab的彩色图形界面点阵生成技术

为了解决嵌入式系统彩色界面开发遇到的彩色图形点阵生成的问题,利用Matlab的图像处理函数和强大的矩阵运算功能设计一个可行的算法.并针对传统方法操作复杂,转换失真、数据溢出、图片混合和与C语言匹配等问题,对该算法进行优化.使用以DSP30F6010A为核心处理器和LMT057DNAFWU为彩色显示器的实验系统,验证该方法.结果显示,该方法转换后的图片失真小,而且兼容性好,可用于大部分的图片格式转换,图形点阵适用于嵌入式系统的彩色界面开发.     

基于VC++与PMAC的机器人控制软件的开发

以IPC+DSP作为六自由度工业机器人的控制器,设计了一种基于可编程多轴控制器PMAC(ProgrammableMulti-Axis Controller)的开放式机器人控制系统.采用Visual C++编制控制程序,将机器人系统中管理、控制功能的实现分为若干个模块,负责底层伺服驱动的函数利用PMAC运动语言编写,可直接调用.整个控制软件能完成数据及运动状态显示、伺服驱动、机器人路径规划及定位等任务.实践证明该机器人控制系统运行平稳.     

车用催化剂评价系统开发

为了开发车用催化剂评价系统,减轻对国外成套测试系统的依赖,基于DSP56F807数字信号处理器,构建了集USGR和HORIBA于一体的系统硬件平台.采用C语言和LabVIEW语言编写了数据采集程序和LabVIEW与DSP接口程序,采用TCP/IP协议实现了HORIBA浓度数据的上位机采集.该系统具有对USGR温度数据与HORIBA浓度数据进行联合采集、保存和图形显示的功能.实验结果证明,该系统运行可靠,已投入实际应用.     

单片机C与汇编混合编程在DS18B20温度采集中的应用

在嵌入式程序设计中,C语言和汇编语言是两种应用最广泛的编程语言,它们各有突出的优点。本文中详细介绍了这两种编程语言混合调用的方法,并以DS18B20温度采集系统为例,在程序设计中灵活运用这两种编程语言,使程序简洁而高效,对学生学习、运用单片机C语言与汇编语言的混合调用,解决实际问题具有一定的参考价值。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has