C代码在TMS320C54X上的手工汇编优化

随着DSP技术的不断发展和完善,数字信号处理的应用范围越来越广泛。工控、计算机、通信和消费电子产品中,都会找到它的影子。近年来,随着多媒体通信的蓬勃发展,DSP也越来越多的应用在多媒体通信。在多媒体通信中,DSP多用于语音压缩和图像处理等方面,而这些都需要巨大的计算量。     

ANSI C代码在TMS320C55X上的移植和优化

引言 随着DSP技术的不断发展和完善,数字信号处理的应用范围越来越广泛。工控、计算机、通信和消费电子产品中,都会找到它的影子。到了20世纪80年代后期,各个DSP的生产商都推出了自己的高级语言编译器。这使得利用高级语言开发DSP软件成为可能。     

ANSI C代码在TMS320C55X上的移植和优化

引言 随着DSP技术的不断发展和完善,数字信号处理的应用范围越来越广泛.工控、计算机、通信和消费电子产品中,都会找到它的影子.到了20世纪80年代后期,各个DSP的生产商都推出了自己的高级语言编译器.这使得利用高级语言开发DSP软件成为可能.     

嵌入式语音系统中多路通信接口的实现

随着语音业务越来越趋于多样化，传统的DSP技术只能简单地对语音进行处理，不能完全胜任业务的多样性。该文介绍了一种利用通信处理芯片MPC860和DSP芯片TMS320VC5509实现多路实时语音通信的方案，并主要讨论了其关键模块QMC驱动。该方案已经得到了应用，能够较好地满足多通道、多路共听的实时语音业务需求。     

面向并行图像处理的实时分布式操作系统的设计与实现

针对多片TMS320C64 DSP构成的多计算机体系结构的实时图像识别系统，设计并实现了面向并行图像处理的实时分布式操作系统PIPORTDOS（Parallel image processing-oriented real-time distributed operating system）．PIPORTDOS基于微内核体系结构，包括硬件抽象层、系统核心层、分布式消息通信机制和系统服务层四个层次．其多任务内核实现了基于优先级的抢先式调度、任务闻的同步和通信原语、实时的中断处理以及面向应用的缓存管理机制．为了实现对分布式并行图像处理的支持，PIPORTDOS采用了基于消息传递（Message Passing）的方式，并在实现中充分考虑了上层图像处理算法的应用需求以及DSP的硬件功能．相关性能指标表明，本文设计实现的PIPORTDOS完全可以满足系统的强实时性要求．在功能上也能适应算法对不同并行结构的需求．     

基于DSP EMIF口及FPGA设计并实现多DSP嵌入式系统

在实时图像处理、雷达信号处理、软件无线电、电子对抗、3G数值仿真计算中,单DSP无法满足实时性和高速运算量要求,往往需要多DSP进行协同处理。本文针对DSP的EMIF接口和FPGA的特点,设计8个DSP通信的嵌入式系统。试验结果表明,所设计的多DSP通信的嵌入式系统,工作性能稳定,数据处理能力强,适用于高端的雷达信号处理、电子对抗、超声图像处理等场合。     

TMS320C6678中的高速串行接口RapidIO研究

本文从嵌入式多核处理器之间高速数据通信的应用出发,结合对TI的TMS320C6678多核DSP的认识,开展了对RapidIO(SRIO)接口协议和TMS320C6678 SRIO模块结构的研究.并在此基础上,工程实现了TMS320C6678片间SRIO通信的详细配置过程,并对其通信性能进行了评测分析,为多核DSP系统级通信的设计提供了一定的参考.     

多核高速并行数字信号处理板设计及应用

随着DSP芯片生产制造技术的日益发展,基于多核的高性能DSP在通信与信息系统、信号与信息处理、自动控制、雷达、军事、航空航天、医疗、家用电器等许多领域获得越来越多的应用。文章将介绍基于4片ADSP-TS201的高速并行数字信号处理板的软硬件设计及在某雷达相参处理设备中的应用。     

基于TMS320C6000系列DSP的C代码优化方法研究

随着 DSP任务系统的复杂度增大 ,如何使 DSP任务系统充分利用资源成为了软件开发的关键环节之一 ,而程序优化是解决这一问题的有效途径。优化的过程大致分为三个阶段。首先 ,利用 C编译器对程序整体优化 ;其次 ,对重要循环体进行结构调整 ;最后 ,我们再针对一些特殊问题 ,采用线性汇编直接改写。本文基于 TMS32 0 C60 0 0系列 DSP,着重于具体应用 ,对这三个阶段进行详细论述。     

一种基于TMS320C6678多核处理器的JPEG实时解码优化算法

针对电子信息系统应用中数字视频的实时处理要求,在解析JPEG解码原理的基础上,针对多核DSP的系统架构,提出了多核DSP任务并行设计方法,设计了基于TMS320C6678的JPEG解码系统,实现了解码任务并行流水和核间高效通信。实验结果表明,基于TMS320C6678的JPEG解码系统的实时处理能力有很大提升,在电子信息系统数字视频传输与处理领域有广泛应用前景。     

OKI C5200／C3100

激光打印和LED打印是当今数码打印领域的两大核心技术．二者的不同之处在于光扫描成像过程。目前．普通激光打印技术的光扫描成像过程是将全部数据信号串行传送给一个光发射装置,然后发射出的光线经旋转的多棱镜反射后再成像于感光鼓上。类似于激光打印技术,LED技术的光扫描成像方式则是采用了密集LED阵列为光发射器,数据电信号经LED转化为光信号．并照射到感     

Exceptional C or C with exceptions

C does not have exception handling facilities. Errors are handled by examining the value returned by each function and signals (conditions reported to the program) are handled by using library functions. These approaches lead to ad hoc error-handling techniques and can make programs hard to understand. Exceptional C, a superset of C, provides exception handling facilities. Exceptional C integrates the two techniques used by C programmers (i.e., status values and signals) to handle errors into one unified exception handling mechanism. In this paper, I review exception handling models, specify the criteria used for designing the exception handling facilities in Exceptional C, and then describe these facilities. I also illustrate the use of the exception handling facilities with examples.     

High-fidelity C/C++ code transformation

As software systems become increasingly massive, the advantages of automated transformation tools are clearly evident. These tools allow the machine to both reason about and manipulate high-level source code. They enable off-loading of mundane and laborious programming tasks from human developer to machine, thereby reducing cost and development time frames.Although there has been much work in software transformation, there still exist many hurdles in realizing this technology in a commercial domain. From our own experience, there are two significant problems that must be addressed before transformation technology can be usefully applied in a commercial setting. These are: (1) Avoiding disruption of the style (i.e., layout and commenting) of source code and the introduction of any undesired modifications that can occur as a side effect of the transformation process. (2) Correct automated handling of C preprocessing and the presentation of a semantically correct view of the program during transformation. Many existing automated transformation tools require source to be manually modified so that preprocessing constructs can be parsed. The real semantic of the program remains obscured resulting in the need for complicated analysis during transformation. Many systems also resort to pretty printing to generate transformed programs, which inherently disrupts coding style. In this paper we describe our own C/C++ transformation system, Proteus, that addresses both these issues. It has been tested on millions of lines of commercial C/C++ code and has been shown to meet the stringent criteria laid out by Lucent’s own software developers.     

High-Fidelity C/C++ Code Transformation

As software systems become increasingly massive, the advantages of automated transformation tools are clearly evident. These tools allow the machine to both reason about and manipulate high-level source code. They enable off-loading of mundane and laborious programming tasks from human developer to machine, thereby reducing cost and development timeframes.Although there has been much academic work in software transformation, there still exists many hurdles in realising this technology in a commercial domain. From our own experience, there are two significant problems that must be addressed before transformation technology can be usefully applied in a commercial setting. These are: 1.) avoiding disruption of style (i.e. layout and commenting) and the introduction of any undesired modifications which occur as a side effect of the transformation process. 2.) correct handling of C preprocessing and the presentation of a semantically correct view of the program during transformation. Many existing automated transformation tools inherently disrupt style through the use of pretty printing and the need to perform preprocessing before any transformation. Some also require source to be modified so that it conforms to a subset of the grammar. In this paper we describe our own C/C++ transformation system, Proteus, that is able to meet the stringent criteria laid out by Lucent's own software developers.     

改进C/C++的预处理功能

预处理在C/C 中发挥着重要作用,然而这些预处理功能存在着一些缺陷,例如在头文件包含进来时,无法改变头文件中的内容;代码的重用性不高;大量重复代码等等。本文提出用一种高级配置语言XVCL(XML-basedVariantConfigura-tionLanguage)代替原来的预处理机制,来克服以上提出的问题。文件被组织为树形结构,并定义了利于提高重用性的变量作用域机制。文章通过一个实例来验证本文提出的方法的有效性。     

C2C电子商务企业竞争力研究

伴随着互联网的发展,电子商务逐渐进入我们的经济生活中。作为网络经济的产物,电子商务企业与传统企业在竞争优势上存在巨大差异。面对着日益激烈的竞争,电子商务企业如何保持核心竞争力优势对企业的生存尤为重要。本文聚焦于C2C领域,并以淘宝网为例,尝试从企业核心竞争力的角度诠释电子商务企业与传统企业竞争优势的差异和竞争力培养的着力点。     

C/C++预处理分析与改进

通常的C/C 预处理器是一个宏处理器,在编译前自动地把源文件转换为编译器可识别的形式。传统的预处理方法基于文本行替换,没有考虑到具体的上下文环境。这种预处理机制在文件包含、宏作用域、头文件关系上存在着一些缺陷,会影响工程项目代码重用,降低程序的可维护性、可扩展性等。通过从分析c预处理器缺陷出发,并利用FOG[1]及其语言可以得到一种基于元变量和元函数的语法替换机制的解决方案。