TMS320C54XX系列DSP与PC机间串行通信的实现

目前大多数数字信号处理器(DSP)芯片上未提供通用异步串行收发器(UART),只提供2～3个同步串行接口,其与微机及其它设备进行串行通信时,必须在DSP上扩展异步串行接口。以美国TI公司TMS320C54XX系列DSP为例,采用MAXIM公司的MAX3111异步串行收发器,研究了理想的接口扩展方案。论述了这种方案的软、硬件实现。该方案硬件连接简单,软件编程方便,可实现DSP与PC机间的串行通信,具有很高的工程应用价值。     

同步串行数据适配器(SSDA)

MC6852同步串行数据接口适配器为同步数据信息交换提供了一个双向串行接口。它包括用于在构成系统(如 M6800微处理系统)的总线上同时发送和接收标准同步通讯字符的接器逻辑。MC6852的总线接口有选择,许可,读/写、中断和总线接口逻辑,以使数据在一个8位双向数据总线上传送成为可能。总线系统的并行数据被具有同步、满字符插入/删除和错误校验的同步数据接口所串行发送和接收。在系统被予置时,SSDA 的功能组合通过数据总线被编成程序。可编程序控制寄     

TMS320C54XX系列DSP异步串行数据传输的研究与实现

美国TI公司TMS320C54XX系列DSP芯片，其片上未提供通用异步串行收发器(UART)，而只有2—3个多通道缓冲同步串行接口(McBSP)，对于与微机及其它设备进行异步数据传输的应用，必须在DSP上扩展异步串口。采用MAXIM公司的MAX3111异步串行收发器，以SPI方式与DSP直接接口，在硬件连接简单，软件编程方便的情况下，实现了同步到异步RS-232数据传输的转换，其数据通信正确、可靠，已经在工程实践中得到了很好的应用。本文详细论述了这种方法的软硬件实现。     

基于FPGA的智能串口模块设计

基于FPGA的智能串口模块用于扩展3U Comapct PCI工业控制计算机的RS232串行接口。智能串口模块在硬件设计采用FPGA,在FPGA内部实现NiosⅡ软核,作为处理器实现串行通讯的智能控制功能,通过设计通用异步串行控制器（UART）IP核,实现串行接口的通讯协议,使模块具集成度高、有可灵活配置性、易功能扩展等优点,模块采用处理器管理串行接口的数据收发,从而提高了串行接口数据传输的稳定性,降低了在传输过程中出现数据丢失现象的几率。     

基于DSP的多通道数据采集系统的设计与实现

本文介绍了一种基于DSP的多路数据采集卡的设计和实现方案，从系统的硬件和软件设计两个方面详细阐述了总体方案及其原理．并针对DSP的同步串行接口，研究了其串口扩展方案，实现了DSP与PC机间的串行通信。该方案具有很高的工程应用价值。     

PLC与单片机之间的串行通信及技术应用分析

本研究提出了PLC与单片机之间串行通信实现的技术方法,对串行通信的硬件组成、接口电路、串行接口、串行口参数、串行通信协议、串行口通信过程进行了设计与阐述,进而实现了单片机与PLC的串行通信,进一步阐述了这一技术在多个领域中的有效应用。     

给AVR单片机构造移位寄存器方式的输出函数

Atmel公司出品的AVR系列高速嵌入式单片机的卓越性能正逐步引起人们的注意.当系统MCU大部分的I/O口用作控制口,不能提供足够的并行通信口时,必须用串行方式解决通信问题.AVR高速嵌入式单片机有2种形式的串行接口:主要用于程序下载的高速同步串行接口SPI及通用异步串行接口UART.当系统设置SPI口特殊用途的情况下,对外串行接口通信通过UART口实现.使用过MCS-51系统的人都知道,MCS-51的UART接口有4种方式,其中方式0是外接移位寄存器工作方式,通过指令:     

串行通信中的波特率设置

<正> MCS-51单片机具有串行通信能力。它的串行接口(VART)是一个全双工的通信接口,能方便的与其他单片机实现双机或多机串行通信。随着IBM-PC 机的普及和单片机应用的迅速发展,把这两种微型机结合起来的应用日益广泛,从而使之既具有较强的实时     

串行外围接口SPI功能模块的设计

串行外设接口SPI是现在很流行的一种同步串行接口,可用于与其他外设或者单片机进行通信.根据SPI总线性能特点,给出了SPI总线的数据传输规范,设计了一种SPI的IP功能模块,并成功应用到监控系统SOC芯片中.     

给AVR单片机构造移位寄存器方式的输出函数

Atmel公司出品的AVR系列高速嵌入式单片机的卓越性能正逐步引起人们的注意。当系统MCU大部分的I/O口用作控制口,不能提供足够的并行通信口时,必须用串行方式解决通信问题。AVR高速嵌入式单片机有2种形式的串行接口:主要用于程序下载的高速同步串行接口SPI及通用异步串行接口UART。当系统设置SPI口特殊用途的情况下,对外串行接口通信通过UART口实现。使用过MCS-51系统的人都知道,MCS-51的UART接     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。