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bridge

  • 基于AVR单片机的闭环控制系统

      针对科研实验中对拉压千斤顶加载过程控制的需要,采用ATmega128单片机控制步进电机进而实现对执行系统的电动泵站实行自动控制。对力和位移的数据采集与处理及用步进电机控制电动泵站手柄的技术细节作了重点描述。通过单片机的A/D变换器对AMP放大模块采集的电桥信号作量化处理,千斤顶的操控手柄位置依电动油泵阀门开启的方向和大小作若干定位,单片机根据力或位移传感器信号,实时控制步进电机驱动手柄旋转到相应操控位置。   Abstract:   This article describes the use of ATmega128 AVR microcontroller series of DBS electric pumping stations and QF100/200 separate twoway hydraulic jack to automate the process of manipulating the work of the technical content. Articles on force and displacement data acquisition and processing, and stepper motor control electric pump with the handle of the key technical details were described. Through the MCU’s A / D converter module is collected on the AMP amplification quantify the signal bridge, jack handle position control valve opening according to the direction of electric pumps for a number of positioning and size of the microcontroller based on force or displacement sensor signals, real-time control stepper motor drive control handle rotate to the appropriate location.  

    标签: AVR 单片机 闭环控制

    上传时间: 2014-01-16

    上传用户:hasan2015

  • 基于C8051F930的管道温度压力远程监测系统

       为解决输油管道温度压力参数实时监测的问题,设计了以C8051F930单片机作为控制核心的超低功耗输油管道温度压力远程监测系统。现场仪表使用高精度电桥采集数据,通过433 MHz短距离无线通信网络与远程终端RTU进行通信,RTU通过GPRS网络与PC上位机进行远程数据传输,在上位机中实现数据存储和图形化界面显示,从而实现输油管道温度压力参数的实时监测和异常报警。经实验证明,该系统的12位数据采集精度满足设计要求,漏码率小于1%,正常工作时间超过5个月,能实时有效地监测输油管道的温度压力参数,节省大量人工成本,有效预防管道参数异常造成的经济损失和环境污染。 Abstract:  In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters, the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field instruments for data collection, the 433MHz short-range wireless communication network was used to make communication between field instrument and RTU, the GPRS was used by the RTU to transmit data to the PC host computer, and the data was stored and displayed in the PC host computer, so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time, it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.

    标签: C8051F930 温度 压力 远程监测系统

    上传时间: 2013-11-07

    上传用户:cuibaigao

  • 基于OMAP1510的mp3播放器设计

      第一章 序論……………………………………………………………6   1- 1 研究動機…………………………………………………………..7   1- 2 專題目標…………………………………………………………..8   1- 3 工作流程…………………………………………………………..9   1- 4 開發環境與設備…………………………………………………10   第二章 德州儀器OMAP 開發套件…………………………………10   2- 1 OMAP介紹………………………………………………………10   2-1.1 OMAP是什麼?…….………………………………….…10   2-1.2 DSP的優點……………………………………………....11   2- 2 OMAP Architecture介紹………………………………………...12   2-2-1 OMAP1510 硬體架構………………………………….…12   2-2.2 OMAP1510軟體架構……………………………………...12   2-2.3 DSP / BIOS bridge簡述…………………………………...13   2- 3 TI Innovator套件 -- OMAP1510 ……………………………..14   2-2.1 General Purpose processor -- ARM925T………………...14   2-2.2 DSP processor -- TMS320C55x …………………………15   2-2.3 IDE Tool – CCS …………………………………………15   2-2.4 Peripheral ………………………………………………..16   第三章 在OMAP1510上建構Embedded Linux System…………….17   3- 1 嵌入式工具………………………………………………………17   3-1.1 嵌入式程式開發與一般程式開發之不同………….….17   3-1.2 Cross Compiling的GNU工具程式……………………18   3-1.3 建立ARM-Linux Cross-Compiling 工具程式………...19   3-1.4 Serial Communication Program………………………...20   3- 2 Porting kernel………………………………………………….…21   3-2.1 Setup CCS ………………………………………….…..21   3-2.2 編譯及上傳Loader…………………………………..…23   3-2.3 編譯及上傳Kernel…………………………………..…24   3- 3 建構Root File System………………………………………..…..26   3-3.1 Flash ROM……………………………………………...26   3-3.2 NFS mounting…………………………………………..27   3-3.3 支援NFS Mounting 的kernel…………………………..27   3-3.4 提供NFS Mounting Service……………………………29   3-3.5 DHCP Server……………………………………………31   3-3.6 Linux root 檔案系統……………………………….…..32   3- 4 啟動及測試Innovator音效裝置…………………………..…….33   3- 5 建構支援DSP processor的環境…………………………...……34   3-5.1 Solution -- DSP Gateway簡介……………………..…34   3-5.2 DSP Gateway運作架構…………………………..…..35   3- 6 架設DSP Gateway………………………………………….…36   3-6.1 重編kernel……………………………………………...36   3-6.2 DEVFS driver…………………………………….……..36   3-6.3 編譯DSP tool和API……………………………..…….37   3-6.4 測試……………………………………………….…….37   第四章 MP3 Player……………………………………………….…..38   4- 1 MP3 介紹………………………………………………….…….38   4- 2 MP3 壓縮原理……………………………………………….….39   4- 3 Linux MP3 player – splay………………………………….…….41   4.3-1 splay介紹…………………………………………….…..41   4.3-2 splay 編譯………………………………………….…….41   4.3-3 splay 的使用說明………………………………….……41   第五章 程式改寫………………………………………………...…...42   5-1 程式評估與改寫………………………………………………...…42   5-1.1 Inter-Processor Communication Scheme…………….....42   5-1.2 ARM part programming……………………………..…42   5-1.3 DSP part programming………………………………....42   5-2 程式碼………………………………………………………..……43   5-3 雙處理器程式開發注意事項…………………………………...…47   第六章 效能評估與討論……………………………………………48   6-1 速度……………………………………………………………...48   6-2 CPU負載………………………………………………………..49   6-3 討論……………………………………………………………...49   6-3.1分工處理的經濟效益………………………………...49   6-3.2音質v.s 浮點與定點運算………………………..…..49   6-3.3 DSP Gateway架構的限制………………………….…50   6-3.4減少IO溝通……………….………………………….50   6-3.5網路掛載File System的Delay…………………..……51   第七章 結論心得…

    标签: OMAP 1510 mp3 播放器

    上传时间: 2013-10-14

    上传用户:a471778

  • MPC106 PCI bridge/Memory Contr

    In this document, the term Ô60xÕ is used to denote a 32-bit microprocessor from the PowerPC architecture family that conforms to the bus interface of the PowerPC 601ª, PowerPC 603ª, or PowerPC 604 microprocessors. Note that this does not include the PowerPC 602ª microprocessor which has a multiplexed address/data bus. 60x processors implement the PowerPC architecture as it is speciÞed for 32-bit addressing, which provides 32-bit effective (logical) addresses, integer data types of 8, 16, and 32 bits,and ßoating-point data types of 32 and 64 bits (single-precision and double-precision).1.1 Overview The MPC106 provides an integrated high-bandwidth, high-performance, TTL-compatible interface between a 60x processor, a secondary (L2) cache or additional (up to four total) 60x processors, the PCI bus,and main memory. This section provides a block diagram showing the major functional units of the 106 and describes brießy how those units interact.Figure 1 shows the major functional units within the 106. Note that this is a conceptual block diagram intended to show the basic features rather than an attempt to show how these features are physically implemented on the device.

    标签: bridge Memory Contr MPC

    上传时间: 2013-10-08

    上传用户:18711024007

  • MPC106 PCI桥/存储器控制器硬件规范说明

    The Motorola MPC106 PCI bridge/memory controller provides a PowerPCªmicroprocessor common hardware reference platform (CHRPª) compliant bridgebetween the PowerPC microprocessor family and the Peripheral Component Interconnect(PCI) bus. In this document, the term Ô106Õ is used as an abbreviation for the phraseÔMPC106 PCI bridge/memory controllerÕ. This document contains pertinent physicalcharacteristics of the 106. For functional characteristics refer to theMPC106 PCI bridge/Memory Controller UserÕs Manual.This document contains the following topics:Topic PageSection 1.1, ÒOverviewÓ 2Section 1.2, ÒFeaturesÓ 3Section 1.3, ÒGeneral ParametersÓ 5Section 1.4, ÒElectrical and Thermal CharacteristicsÓ 5Section 1.5, ÒPin AssignmentsÓ 17Section 1.6, ÒPinout Listings 18Section 1.7, ÒPackage DescriptionÓ 22Section 1.8, ÒSystem Design InformationÓ 24Section 1.9, ÒDocument Revision HistoryÓ 29Section 1.10, ÒOrdering InformationÓ 29

    标签: MPC 106 PCI 存储器

    上传时间: 2013-11-04

    上传用户:as275944189

  • PL2303 USB to Serial Adapter

    The PL2303 USB to Serial adapter is your smart and convenient accessory forconnecting RS-232 serial devices to your USB-equipped Windows host computer. Itprovides a bridge connection with a standard DB 9-pin male serial port connector inone end and a standard Type-A USB plug connector on the other end. You simplyattach the serial device onto the serial port of the cable and plug the USB connectorinto your PC USB port. It allows a simple and easy way of adding serial connectionsto your PC without having to go thru inserting a serial card and traditional portconfiguration.This USB to Serial adapter is ideal for connecting modems, cellular phones, PDAs,digital cameras, card readers and other serial devices to your computer. It providesserial connections up to 1Mbps of data transfer rate. And since USB does not requireany IRQ resource, more devices can be attached to the system without the previoushassles of device and resource conflicts.Finally, the PL-2303 USB to Serial adapter is a fully USB Specification compliantdevice and therefore supports advanced power management such as suspend andresume operations as well as remote wakeup. The PL-2303 USB Serial cable adapteris designed to work on all Windows operating systems.

    标签: Adapter Serial 2303 USB

    上传时间: 2013-11-01

    上传用户:ghostparker

  • 嵌入式LINUX 电子教程全集

    嵌入式LINUX  电子教程全集 嵌入式系统出现于60年代晚期,它最初被用于控制机电电话交换机,如今已被广泛的应用于工业制造、过程控制、通讯、仪器、仪表、汽车、船舶、航空、航天、军事装备、消费类产品等众多领域。计算机系统核心CPU,每年在全球范围内的产量大概在二十亿颗左右,其中超过80%应用于各类专用性很强的嵌入式系统。一般的说,凡是带有微处理器的专用软硬件系统都可以称为嵌入式系统。   1. 嵌入式Linux系统就是利用Linux其自身的许多特点,把它应用到嵌入式系统里。   Linux做嵌入式的优势,首先,Linux是开放源代码的,不存在黑箱技术,遍布全球的众多Linux爱好者又是Linux开发者的强大技术支持;其次,Linux的内核小、效率高,内核的更新速度很快,linux是可以定制的,其系统内核最小只有约134KB。第三,Linux是免费的OS,在价格上极具竞争力。 Linux还有着嵌入式操作系统所需要的很多特色,突出的就是Linux适应于多种CPU和多种硬件平台,是一个跨平台的系统。到目前为止,它可以支持二三十种CPU。而且性能稳定,裁剪性很好,开发和使用都很容易。很多CPU包括家电业芯片,都开始做Linux的平台移植工作。移植的速度远远超过Java的开发环境。也就是说,如果今天用Linux环境开发产品,那么将来换CPU就不会遇到困扰。同时,Linux内核的结构在网络方面是非常完整的,Linux对网络中最常用的TCP/IP协议有最完备的支持。提供了包括十兆、百兆、千兆的以太网络,以及无线网络,Toker ring(令牌环网)、光纤甚至卫星的支持。所以Linux很适于做信息家电的开发。   还有使用Linux为的是来开发无线连接产品的开发者越来越多。Linux在快速增长的无线连接应用主场中有一个非常重要的优势,就是有足够快的开发速度。这是因为LInux有很多工具,并且Linux为众多程序员所熟悉。因此,我们要在嵌入式系统中使用Linux操作系统。   Linux的大小适合嵌入式操作系统——Linux固有的模块性,适应性和可配置性,使得这很容易做到。另外,Linux源码的实用性和成千上万的程序员热切其望它用于无数的嵌入式应用软件中,导致很多嵌入式Linux的出现,包括:Embedix,ETLinux,LEM,Linux Router Project,LOAF,uCLinux,muLinux,ThinLinux,FirePlug,Linux和PizzaBox Linux   相对,Linux的图形界面还相对较弱,但近年Linux的图形界面发展也很快,这也就不是问题。   2. 什么是嵌入式Linux   嵌入式linux 是将日益流行的Linux操作系统进行裁剪修改,使之能在嵌入式计算机系统上运行的一种操作系统。嵌入式linux既继承了Interlnet上无限的开放源代码资源,又具有嵌入式操作系统的特性。嵌入式Linux的特点是版权费免费;购买费用媒介成本技术支持全世界的自由软件开发者提供支持网络特性免费,而且性能优异,软件移植容易,代码开放,有许多应用软件支持,应用产品开发周期短,新产品上市迅速,因为有许多公开的代码可以参考和移植,实时性能RT_Linux Hardhat Linux 等嵌入式Linux支持,实时性能稳定性好安全性好。   3. 嵌入式Linux有巨大的市场前景和商业机会,出现了大量的专业公司和产品,如Montavista Lineo Emi等,有行业协会如Embedded Linux Consortum等,得到世界著名计算机公司和OEM板级厂商的支持,例如IBM Motorola Intel等。传统的嵌入式系统厂商也采用了Linux策略,如Lynxworks Windriver QNX等,还有Internet上的大量嵌入式Linux爱好者的支持。嵌入式Linux支持几乎所有的嵌入式CPU和被移植到几乎所有的嵌入式OEM板。   4.嵌入式Linux的应用领域非常广泛,主要的应用领域有信息家电、PDA 、机顶盒、Digital Telephone、Answering Machine、Screen Phone 、数据网络、Ethernet Switches、Router、bridge、Hub、Remote access servers、ATM、Frame relay 、远程通信、医疗电子、交通运输计算机外设、工业控制、航空航天领域等。   5.如果分别让10位工程师给出嵌入式系统的定义,将得到10个不同的答案。一般来说,大部分的嵌入式系统执行特定的任务。我们假定最简单的嵌入式系统包括输入/输出功能,以及一些控制逻辑,该系统基于它的配置执行某些类型的功能。按照这个标准,可以认为一个包含实现控制逻辑74123计数器以及一个状态是一个嵌入式系统。也许可以补充说,该系统必须可通过存储在固件中的软件进行编程。这个新的嵌入式系统定义包括输入/输出(I/O),以及存储在系统固件中的控制逻辑。一个带有鼠标、键盘、网络连接并运行图形用户界面(GUI,graphical user interface)多任务操作系统的桌面计算机显然满足这些要求,但我们能认为它是一个嵌入式系统吗?   如果桌面计算机不是一个嵌入式系统,那么手持设备呢?它们有I/O功能,可以运行存储在固件中的控制逻辑。有人说,桌面计算机和手持设备都有通用计算机设备,可以运行软件来执行许多不同的任务,与之不同的是,嵌入式系统(例如,洗碗机控制器或飞行导航系统)主要是为特定任务而设计的。这种特定的功能限定使嵌入式设备有功能上的唯一性。如果是这样,为什么一些嵌入式系统设计成具有附加的功能,如存储在非易失性存储器中的程序,并且具有运行可以完成原始设计范围之外的任务的多任务操作系统的能力呢?   在过去,区分嵌入式系统和通用计算机比现在简单的多。例如,可以很容易地区分出一个基于8051的T1分幅卡嵌入式系统和一台Sun UNIX工作站。而现在,从功能方面很难区分一台Sun工作站和一个包含PowerPC以及32MB内存和16MB闪存的机顶盒。这样的机顶盒可以运行带GUI的多任务操作系统,可现场升级,可以同时运行多个程序(如视频控制器、数字录像和Java虚拟机),还可以进行安全的因特网在线交易。很难判断这种机顶盒是否是一个嵌入式系统。显然,硬件性能的提升和价格的下降使通用计算机和嵌入式系统之间的界限变得很模糊,技术的进步使得我们很难定义什么是嵌入式。

    标签: LINUX 嵌入式 电子教程

    上传时间: 2014-12-30

    上传用户:ljt101007

  • Rf And Microwave Power Amplifier Design(2005)

    The main objective of this book is to present all the relevant informationrequired for RF and micro-wave power amplifier design includingwell-known and novel theoretical approaches and practical design techniquesas well as to suggest optimum design approaches effectively combininganalytical calculations and computer-aided design. This bookcan also be very useful for lecturing to promote the analytical way ofthinking with practical verification by making a bridge between theoryand practice of RF and microwave engineering. As it often happens, anew result is the well-forgotten old one. Therefore, the demonstrationof not only new results based on new technologies or circuit schematicsis given, but some sufficiently old ideas or approaches are also introduced,that could be very useful in modern practice or could contributeto appearance of new ideas or schematic techniques.

    标签: Amplifier Microwave Design Power

    上传时间: 2013-12-22

    上传用户:vodssv

  • 设计模式

    设计模式,adapter,bridge,chain

    标签: 设计模式

    上传时间: 2014-01-19

    上传用户:qunquan

  • YilingChangjiangRiverbridgeisa3 pylonc retecable stayedbridgewith PPWScablesystemandsingleplanesta

    YilingChangjiangRiverbridgeisa3 pylonc retecable stayedbridgewith PPWScablesystemandsingleplanestaycables.Quiteafewnewproblemswereencounteredintheerectionof themaingirderofthebridgeowingtoutilizationofthenewstructures,workmanshipsandmaterialsonthe bridge.Inthispaper,thetimesofcabletensioning,theinfluenceofdeadweightofstaycablesuponcable force,andmeasurementofcableforceintheconstructionmonitoringandcontrolareanalyzedinconsiderable details.

    标签: PPWScablesystemandsingleplanesta YilingChangjiangRiverbridgeisa3 stayedbridgewit

    上传时间: 2014-01-17

    上传用户:lmeeworm