The μPSD32xx family, from ST, consists of Flash programmable system devices with a 8032 Microcontroller Core. Of these, the μPSD3234A and μPSD3254A are notable for having a complete implementation of the USB hardware directly on the chip, complying with the Universal Serial Bus Specification, Revision 1.1.This application note describes a demonstration program that has been written for the DK3200 hardware demonstration kit (incorporating a μPSD3234A device). It gives the user an idea of how simple it is to work with the device, using the HID class as a Ready-made device driver for the USB connection.
上传时间： 2014-04-03
上传用户：lizhizheng88
ZigBee技术是一种应用于短距离范围内，低传输数据速率下的各种电子设备之间的无线通信技术。ZigBee名字来源于蜂群使用的赖以生存和发展的通信方式，蜜蜂通过跳ZigZag形状的舞蹈来通知发现的新食物源的位置、距离和方向等信息，以此作为新一代无线通讯技术的名称。ZigBee过去又称为“HomeRF Lite”、“RF-EasyLink”或“FireFly”无线电技术，目前统一称为ZigBee技术。 2、ZigBee技术的特点 自从马可尼发明无线电以来，无线通信技术一直向着不断提高数据速率和传输距离的方向发展。例如：广域网范围内的第三代移动通信网络（3G）目的在于提供多媒体无线服务，局域网范围内的标准从IEEE802.11的1Mbit/s到IEEE802.11g的54Mbit/s的数据速率。而当前得到广泛研究的ZigBee技术则致力于提供一种廉价的固定、便携或者移动设备使用的极低复杂度、成本和功耗的低速率无线通信技术。这种无线通信技术具有如下特点： 功耗低：工作模式情况下，ZigBee技术传输速率低，传输数据量很小，因此信号的收发时间很短，其次在非工作模式时，ZigBee节点处于休眠模式。设备搜索时延一般为30ms，休眠激活时延为15ms，活动设备信道接入时延为15ms。由于工作时间较短、收发信息功耗较低且采用了休眠模式，使得ZigBee节点非常省电，ZigBee节点的电池工作时间可以长达6个月到2年左右。同时，由于电池时间取决于很多因素，例如：电池种类、容量和应用场合，ZigBee技术在协议上对电池使用也作了优化。对于典型应用，碱性电池可以使用数年，对于某些工作时间和总时间（工作时间+休眠时间）之比小于1%的情况，电池的寿命甚至可以超过10年。 数据传输可靠：ZigBee的媒体接入控制层（MAC层）采用talk-when-Ready的碰撞避免机制。在这种完全确认的数据传输机制下，当有数据传送需求时则立刻传送，发送的每个数据包都必须等待接收方的确认信息，并进行确认信息回复，若没有得到确认信息的回复就表示发生了碰撞，将再传一次，采用这种方法可以提高系统信息传输的可靠性。同时为需要固定带宽的通信业务预留了专用时隙，避免了发送数据时的竞争和冲突。同时ZigBee针对时延敏感的应用做了优化，通信时延和休眠状态激活的时延都非常短。 网络容量大：ZigBee低速率、低功耗和短距离传输的特点使它非常适宜支持简单器件。ZigBee定义了两种器件：全功能器件（FFD）和简化功能器件（RFD）。对全功能器件，要求它支持所有的49个基本参数。而对简化功能器件，在最小配置时只要求它支持38个基本参数。一个全功能器件可以与简化功能器件和其他全功能器件通话，可以按3种方式工作，分别为：个域网协调器、协调器或器件。而简化功能器件只能与全功能器件通话，仅用于非常简单的应用。一个ZigBee的网络最多包括有255个ZigBee网路节点，其中一个是主控（Master）设备，其余则是从属（Slave）设备。若是通过网络协调器（Network Coordinator），整个网络最多可以支持超过64000个ZigBee网路节点，再加上各个Network Coordinator可互相连接，整个ZigBee网络节点的数目将十分可观。 兼容性：ZigBee技术与现有的控制网络标准无缝集成。通过网络协调器（Coordinator）自动建立网络，采用载波侦听/冲突检测（CSMA-CA）方式进行信道接入。为了可靠传递，还提供全握手协议。
标签： zigbee
上传时间： 2013-11-24
上传用户：siguazgb
TheTool is highy customizable map editor(based on QT) which can be extended via LUA scripts. A first implentation is Ready and can be published to the public. The editor is the perfect tool who wants to design some 3d games but don t have time to write
标签： customizable extended TheTool scripts
上传时间： 2013-12-12
上传用户：lanwei
Setting up an ADOCE project using Visual C++ 6.0 is rather simple. Assuming that you have downloaded and installed the ADOCE SDK from Microsoft, you are Ready to use it in your Windows CE Database applications. The sample that I have provided is a *very* simple one illustrating how to instantiate the proper COM objects, and the basics of how to interface with them (in a very simple example)
标签： downloaded Assuming Setting project
上传时间： 2015-01-16
上传用户：阳光少年2016
数字密码引爆器的输入描述：1、 在开始输入密码以前的等待状态，首先要按Ready键，表示目前准备就绪，可以输入数字密码；2、 当引爆事件发生后，应该回到等待状态，设置WAIT_T键；3、 如果输入密码不正确，此时要操作Ready和WAIT_T是不起作用的，必须由设计人员重新设置到等待状态，设置SETUP键，SETUP为内部按键，操作人员应该不能接触；4、 确定密码输入后，要设计一个点火按键FIRE；
上传时间： 2015-03-17
上传用户：chenlong
Software Testing, Second Edition provides practical insight into the world of software testing and quality assurance. Learn how to find problems in any computer program, how to plan an effective test approach and how to tell when software is Ready for release. Updated from the previous edition in 2000 to include a chapter that specifically deals with testing software for security bugs, the processes and techniques used throughout the book are timeless. This book is an excellent investment if you want to better understand what your Software Test team does or you want to write better software.
标签： practical Software provides software
上传时间： 2015-04-30
上传用户：bjgaofei
This a JavaBean application, which contains 4 beans. In this package, there are 4 files: cexchange.jar(Ready to load into BeanBuilder), readme.txt, currencyData.txt(data file), screenshot.jpg(linking beans)
标签： application cexchange JavaBean contains
上传时间： 2015-07-05
上传用户：二驱蚊器
With a worldwide community of users and more than a million dedicated programmers, Perl has proven to be the most effective language for the latest trends in computing and business. Every programmer must keep up with the latest tools and techniques. This updated version of Advanced Perl Programming from O Reilly gives you the essential knowledge of the modern Perl programmer. Whatever your current level of Perl expertise, this book will help you push your skills to the next level and become a more accomplished programmer. O Reilly s most high-level Perl tutorial to date, Advanced Perl Programming, Second Edition teaches you all the complex techniques for production-Ready Perl programs. This completely updated guide clearly explains concepts such as introspection, overriding built-ins, extending Perl s object-oriented model, and testing your code for greater stability. Other topics include: Complex data structures
标签： programmers worldwide community dedicated
上传时间： 2014-10-27
上传用户：zhoujunzhen
From the Publisher Focus on 2D in Direct3D? teaches you all of the tools and tips you ll need to dive right in and begin creating your own games. If you have some knowledge of C or C++ and have been searching for a guide that will take your 2D programming into the third dimension, then search no more! In this book you ll learn the skills you ll need to move from the 2D API to Direct3D. Written from the point of view of a 2D programmer, Focus on 2D in Direct3D presents the fundamentals of the Direct3D API in an easy-to-use-and-understand format. Get Ready to jump into the world of Direct3D!
上传时间： 2015-09-01
上传用户：ve3344
bject Inspector is a component suite that contains inspectors allowing you to change anything in your application at runtime. Object Inspector suite includes: TPropertyInterface component for easy access to any property or event of any component at runtime TComponentInspector customizable full-functional runtime object inspector control TComponentComboBox control for easy selecting component TCommonInspector abstract inspector control for inspect anything in your application TDBInspector Ready-to-use database inspector control TIniInspector Ready-to-use ini-file inspector control TApplicationInspector Ready-to-use inspector control for changing Application properties at runtime TSystemColorsInspector Ready-to-use inspector control for changing Windows colors Examples small and clean projects illustrating features of inspectors and TPropertyInterface components Source codes full source code of all components and useful internal classes
标签： inspectors Inspector component allowing
上传时间： 2015-10-02
上传用户：无聊来刷下
