LCD控制器S1D13506在AT91RM9200嵌入式系统中的应用

介绍一款新颖的大规模液晶显示控制芯片S1D13506,结合该芯片在AT91RM9200嵌入式系统中的应用,侧重说明它与AT91RM9200、2MB的显示缓存、LCD、CRT、TV和电源时钟等接口电路的设计。     

基于AT91RM9200的S1D13506显示控制器的LCD驱动移植

主要分析了嵌入式系统中的显示模块,介绍了基于AT91RM9200的控制系统与S1D13506的接口,并研究了在AT91RM9200嵌入式系统中S1D13506显示驱动的移植,改进了以往在嵌入式系统中显示内核驱动的移植方法,最后,给出了完整的移植方法并且应用到疲劳试验机的数字控制系统中。     

AT91RM9200在电机控制系统中的应用

在电机控制与速度测量系统的网络化控制器设计中,使用Atmel公司的AT91RM9200处理器,可以满足实时性要求.本文介绍了AT91RM9200的特点、使用方法,给出了采用AT91RM9200的电机控制系统的硬件设计方案,着重讨论AT91RM9200在系统中的应用及其外设接口电路的设计.     

基于CC2420的无线传感节点平台研究

介绍了串行外设接口(SPI)在无线射频芯片CC2420和ARM处理器AT91RM9200接口中的应用方案,给出了二者详细的硬件连接图和嵌入式Linux下驱动的实现方法,该方法同样适合其他具有SPI接口的芯片和微处理器之间的接口与编程.CC2420和AT91RM9200基于SPI的串行通信为无线传感器网络提供了一个节点硬件平台的解决方案.     

基于AT91RM9200的CAN-Ethernet间的智能网关的设计

本文介绍了基于AT91RM9200的CAN总线与以太网之间的智能网关的设计与实现。给出了AT91RM9200与基于SPI总线的的CAN总线通信芯片MCP2510的硬件接口方法及CAN总线到以太网的双向通信软件实现方法。     

基于AT91RM9200的CAN-Ethernet间的智能网关设计

介绍了基于AT91RM9200的CAN总线与以太网之间的智能网关的设计与实现。给出了AT91RM9200与基于SPI总线的的CAN总线通信芯片MCP2510的硬件接口方法及CAN总线到以太网的双向通信软件实现方法。     

基于AT91RM9200的引导程序分析与设计

嵌入式系统的引导程序一般需要根据系统本身的硬件结构定制。与其他芯片不同,AT91RM9200的引导过程有着独特的机制,分为一级引导与二级引导两个过程。分析了AT91RM9200的整个引导过程以及bootloader的构成,讨论了基于μC/OS-II嵌入式操作系统的引导程序的设计过程,并阐述了bootloader运行的步骤及其实现方法。     

嵌入式系统在大射电望远镜5米模型上悬索控制中的应用

介绍了ARM9和嵌入式实时操作系统μC/OS-II在大射电望远镜5米模型上悬索控制中的应用。介绍了基于ARM9处理器(Atmel公司的AT91RM9200)的触摸屏、LCD等电路的设计。分析了用AT91RM9200产生6路独立的PWM信号的方法。给出了在嵌入式实时操作系统μC/OS-II下的多任务应用软件的设计实例,并成功实现了六轴联动。     

AT91RM9200与TLV2543的接口应用

本文依据SPI串口的设计原理,介绍了AT91RM9200与12位串行A/D转换器TLV2543通过SPI口实现实时通讯的接口电路与软件设计方法.运行结果表明,在嵌入式系统中用串行外设接口(SPI)来扩展外设,接口简单,控制方便.     

基于嵌入式技术的MultiBus-CPU模块设计

为扩展工业控制领域的核心功能并丰富其接口操作,本文提出一种基于AT91RM9200微控制器的智能化多总线测控模块的设计方法以及系统的构建架构,并给出显示接口的软、硬件解决方案。该模块利用嵌入式系统解决了显示接口实现困难的问题,具有较好的实际应用前景。     

Mechanical Control Systems and Kinematic Systems

The aim of this technical note is to analyze the equivalence between the second-order equations describing the dynamics of mechanical systems, and the associated kinematic system when dealing with nonholonomic systems with controls. If the system is fully actuated, both systems are equivalent. However, if it is underactuated an extra condition must be imposed to ensure that a weak equivalence holds. Furthermore, the notion of decoupling vector fields is generalized to a vector field distribution. This point of view may be used to obtain better solutions when a cost function is introduced to the controllability problem. The results are applied to some particular examples and to mechanical systems with symmetries.      

Computing Triangular Systems and Regular Systems

A previous algorithm of computing simple systems is modified and extended to compute triangular systems and regular systems from any given polynomial system. The resulting algorithms, based on the computation of subresultant regular subchains, have a simple structure and are efficient in practice. Preliminary experiments indicate that they perform at least as well as some of the known algorithms. Several properties about regular systems are also proved.     

Decomposing Polynomial Systems into Simple Systems

A simple system is a pair of multivariate polynomial sets (one set for equations and the other for inequations) ordered in triangular form, in which every polynomial is squarefree and has non-vanishing leading coefficient with respect to its leading variable. This paper presents a method that decomposes any pair of polynomial sets into finitely many simple systems with an associated zero decomposition. The method employs top-down elimination with splitting and the formation of subresultant regular subchains as basic operation.     

合成信息系统与子信息系统

本文给出了对象合成信息系统、属性合成信息系统、对象子信息系统及属性子信息系统的定义，分别讨论了它们的上下近似算子与原信息系统的上下近似算子之间的关系．并给出了它们的一些实际应用。     

Sampled Data Systems Passivity and Discrete Port-Hamiltonian Systems

In this paper, we present a novel way to approach the interconnection of a continuous and a discrete time physical system first presented in [1][2] [3]. This is done in a way which preserves passivity of the coupled system independently of the sampling time T. This strategy can be used both in the field of telemanipulation, for the implementation of a passive master/slave system on a digital transmission line with varying time delays and possible loss of packets (e.g., the Internet), and in the field of haptics, where the virtual environment should ‘feel’ like a physical equivalent system.     

Representational Systems

The concept of representation has been a key element in the scientific study of mental processes, ever since such studies commenced. However, usage of the term has been all but too liberal—if one were to adhere to common use it remains unclear if there are examples of physical systems which cannot be construed in terms of representation. The problem is considered afresh, taking as the starting point the notion of activity spaces—spaces of spatiotemporal events produced by dynamical systems. It is argued that representation can be analyzed in terms of the geometrical and topological properties of such spaces. Several attributes and processes associated with conceptual domains, such as logical structure, generalization and learning are considered, and given analogues in structural facets of activity spaces, as are misrepresentation and states of arousal. Based on this analysis, representational systems are defined, as is a key concept associated with such systems, the notion of representational capacity. According to the proposed theory, rather than being an all or none phenomenon, representation is in fact a matter of degree—that is can be associated with measurable quantities, as is behooving of a putative naturalistic construct.