嵌入式linux的底层I2C驱动开发

近年来,ARM linux应用范围越来越普遍,对Linux底层驱动的软硬件开发也成为硬件工程师们开发设备需要重点关注的问题。I2C总线的控制现阶段已经在嵌入式控制系统中应用越来越普及。尽管I2C的硬件体系结构不是特别复杂,然而I2C体系结构在Linux系统中的实现却特别复杂。在Linux下面编写I2C驱动最常使用的方法包括将I2C设备作为一个普通的字符设备来处理以及通过Linux I2C驱动体系结构来实现两种形式。     

Linux系统下基于I^2C接口的数据通信的实现

介绍在Linux系统下I2C总线结构、驱动编写以及I2C总线的软、硬件实现方式,并介绍了多线程技术在驱动调用过程中的应用。该方案已在以MPC850芯片为核心的监控平台上实现。     

MPC8xx的PCI总线扩展

随着微处理机、图形界面和网络设备的不断发展,人们对系统的I/O带宽不断提出了新的要求.PCI总线具有高数据传输率、支持32/64位数据传送,多总线主控和线性突发方式等特点,使得PCI总线成为目前最好的局部总线方式之一.文章介绍了如何在通信处理器MPC8xx上扩展PCI总线和PCI设备,并分析了Linux系统下的PCI设备驱动实现.     

嵌入式Linux系统中I2C总线设备的驱动设计

本文分析了Linux系统中I2C驱动程序的结构,并以AT91RM9200和X1227为例,介绍了如何在嵌入式Linux系统中实现I2C总线适配器及I2C设备驱动.     

彩电I2C总线与被控电路的连接及检修

I2C总线是由CPU引出的SDA(串行数据线)和SCL(串行时钟线)两根线组成,CPU利用SCL线向被控电路发送时钟信号,利用SDA线向被控电路发送数据信号或接收被控电路送来的应答信号,被控电路在CPU的控制下,完成各种操作.I2C总线系统控制能力强,可有效减少CPU的引出脚,在新型彩电中被普遍采用.目前,全球有3种总线,即飞利浦I2C总线,ITT(国际电话/电报公司)I2C总线及索尼I2C总线.家电产品中应用最多的是飞利浦I2C总线,ITT I2C总线应用的较少,索尼I2C总线在家电产品中几乎没有应用.     

51单片机I2C总线应用工作原理

1.I2C串行总线概述I2C总线是PHLIPS公司推出的一种串行总线,是具备多主机系统所需的包括总线裁决和高低速器件同步功能的高性能串行总线。I2C总线只有两根双向信号线:一根是数据线SDA;另一根是时钟线SCL。I2C总线通过上拉电阻接正电源。当总线空闲时,两根线均为高电平。连到总线上的任一器件输出的低电平,     

I2C总线在Linux系统中的驱动设计

介绍I2C总线的基本概念和工作原理,叙述I2C总线扩展器件ZLG 7290的功能特点.在以S3C2410为微控制器,ZLG7290为VC总线扩展器件的基础上,介绍通过I2C总线读取键盘的硬件、软件设计,该系统设计体现了I2C总线在嵌入式系统设计应用中的重要作用.     

用单片机控制I~2C器件

I2C总线的应用非常广泛,在很多器件上都配备有I2C总线接口,使用这些器件时一般都需要通过I2C总线进行控制。这里简要介绍I2C总线的工作原理、如何用51单片机进行控制以及相应的汇编语言控制程序的编写。1.I2C总线的特点与应用I2C总线是一种具有自动寻址、高低速设备同步和仲裁等功能的高性能串行总线,能够实现完善的全双工数据传输,它是各种总线中使用信号线数量最少的,只有两根线SCL和SDA,因此构成计算机系统十分方便、灵活。I2C总线具有标准的规范及众多带I2C接口的外围器件,如EPROM、RAM、日历时钟、A/D、D/A等器件,在各类…     

I2C总线驱动在嵌入式系统中的两种实现

I2C总线是一种用于IC器件之间连接的二线制总线,在嵌入式系统中有广泛的应用。嵌入式处理器本身携带I2C控制器时,可以直接通过配置特殊寄存器来实现I2C的功能;而当缺少I2C控制器时,则需要通过软件模拟的方法来实现。简要地叙述了I2C总线协议及其时序,并给出了I2C总线驱动在ARM S3C4510处理器下的两种实现方法,最后以模拟的实现方式给出一个应用实例。     

I~2C总线接口模块的有限状态机实现

I2C总线是一种二线制串口通信总线,首先简要介绍了I2C总线的工作原理,然后分析了接口模块的结构及其电路模型的搭建,并重点研究了用有限状态机对I2C总线接口的FPGA设计,最后进行了功能仿真.     

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.     

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.     

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.     

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.     

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     

JOURNAL OF ELECTRONICS(CHINA)

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NOTICE OF CHANGING JOURNAL OF ELECTRONICS （CHINA） TO MICROSYSTEMS ＆ NANOENGINEERING

正Journal of Electronics(China)(JE)was founded in 1984,sponsored by the Institute of Electronics,Chinese Academy of Sciences.JE is one of the first English academic journals in China in the field of Electronics and Information technology.The journal was published quarterly since it was launched in 1984 to 2003,then it is published bimonthly till now.During