FeaturesThe following standard features are provided.• Choice of RTOS scheduling policy1. Pre-emptive:Always runs the highest available task. Tasks of identical priorityshare CPU time (fully pre-emptive with round robin time slicing).2. Cooperative:Context switches only occur if a task blocks, or explicitly callstaskYIELD().• Co-routines (light weight tasks that utilise very little RAM).• Message queues• Semaphores [via macros]• Trace visualisation ability (requires more RAM)• Majority of source code common to all supported development tools• Wide range of ports and examples
上传时间： 2013-10-13
上传用户：13162218709
单片机系统“PC”失控的软件措施Software Measure of GettingO uto fC ontrolfo r“PC"in S ingleC hipC omputerS ystem谧 加 春 王 晓 基 雷 小 华(江 西 理 工 大 学机 电 工 程 学 院 ，赣 州 34 10 00)摘要单片机系统在实际工业现场中可能遇到各种干扰和自身的随机性故障。现场恶劣的环境有可能使计算机系统发生异常，计算机程序指针“PC”失控就是常见的故障之一，如果发生“PC”失控，将导致CPI工作混乱，酿成严重的事故。研究了“PC”失控的原因，并指出软件抗干扰的几种方法，有效保证单片机系统的正常工作。关键词单片机“PC”失控抗干扰Abstract Inp racticalin dustrialfi elds,th ereis v ariousin terferencea fectingo perationo fsi nglec hipc omputersy stemsa ndt hec omputersy stems。fac吨random faults饰themselves. It is very common that the severe environment makes the computer systems abnormal. The program counter "PC"gettingo utof co ntorlis on eo fth ec ommonfa ults.If th isoc curs,C PUw ouldb eru nningo utof or deran din torducesse riousan cient.T hec ausesof " PC"geting out of control， studied in this paper and some countermeasures of anti-interference师software are given to ensure single chip computer systemworking properly.Keywords Single。饰computer Porgramc ounter"P C" Anti-interfeernc 在设 计 和 开发单片机系统时，一般难以周全地预计单片机系统在实际工业现场中可能遇到的各种干扰和自身的随机性故障。因此，除了采取防止和抑制干扰的各项措施外，还应该借助于软件措施克服某些干扰，系统还应具备迅速自行恢复的能力。本文介绍的应对单片机系统PC失控的软件措施，设计灵活，节省硬件资源，能保证测控系统长期可靠地运行。MC S- 5 1单片机以其优良的性能价格比大量应用于工业现场测试和控制领域。但是，现场恶劣的环境有可能使计算机系统发生异常，计算机程序指针PC失控就是常见的故障之一，一旦发生PC“走飞”，计算机系统就会出现工作混乱，酿成严重的事故。为 了 在 CP 失控时尽量减少由此带来的不利影响，并尽快使系统恢复正常，需要采取一定的软件措施和硬件措施。常见的硬件措施有“看门狗”电路。软件措施设置的前提条件是:①在干扰作用下，微机系统硬件部分不会受到任何损坏，或者损坏部分设置有监测状态可供查询;②程序区不会受到干扰侵害。单片机系统的程序和表格以及重要的参数均设置在ROM区，不会因干扰的侵人而改变;③ RAM区中的重要数据不会被破坏，或者虽然被破坏，但是可以重新建立。
上传时间： 2013-11-02
上传用户：bhqrd30
1 /**————————————————————2 〖说明〗I2C总线驱动程序(用两个普通IO模拟I2C总线)3 包括100Khz(T=10us)的标准模式(慢速模式)选择，4 和400Khz(T=2.5us)的快速模式选择，5 默认11.0592Mhz的晶振。6 〖文件〗PCF8563T.C ﹫2001/11/2 77 〖作者〗龙啸九天 c51@yeah.net http://www.c51bbs.co /8 〖修改〗修改建议请到论坛公布 http://www.c51bbs.co m9 〖版本〗V1.00A Build 080310 —————————————————————*/1112 #ifndef SDA13 #define SDA P0_014 #define SCL P0_115 #endif1617 extern uchar SystemError;1819 #define uchar unsigned char20 #define uint unsigned int21 #define Byte unsigned char22 #define Word unsigned int23 #define bool bit24 #define true 125 #define false 02627 #define SomeNOP(); _nop_();_nop_();_nop_();_nop_();2829 /**--------------------------------------------------------------------------------30 调用方式：void I2CStart(void) ﹫2001/07/0 431 函数说明：私有函数，I2C专用32 ---------------------------------------------------------------------------------*/33 void I2CStart(void)34 {35 EA=0;36 SDA=1; SCL=1; SomeNOP();//INI37 SDA=0; SomeNOP(); //START38 SCL=0;39 }4041 /**--------------------------------------------------------------------------------42 调用方式：void I2CStop(void) ﹫2001/07/0 443 函数说明：私有函数，I2C专用44 ---------------------------------------------------------------------------------*/45 void I2CStop(void)46 {47 SCL=0; SDA=0; SomeNOP(); //INI48 SCL=1; SomeNOP(); SDA=1; //STOP49 EA=1;50 }5152 /**--------------------------------------------------------------------------------53 调用方式：bit I2CAck(void) ﹫2001/07/0 454 函数说明：私有函数，I2C专用，等待从器件接收方的应答55 ---------------------------------------------------------------------------------*/56 bool WaitAck(void)57 {58 uchar errtime=255;//因故障接收方无ACK，超时值为255。59 SDA=1;SomeNOP();60 SCL=1;SomeNOP();61 while(SDA) {errtime--; if (!errtime) {I2CStop();SystemError=0x11;return false;}}62 SCL=0;63 return true;
上传时间： 2014-04-11
上传用户：xg262122
摘 要: 针对三峡水轮机叶片坑内移动式修焊机器人的作业过程测控问题, 研制了一种基于双数字信号处理器的嵌入式视觉反馈控制系统。 采用功能单元模块化设计思想和叠层积木式装配结构, 该系统将基于TM S320DM 642 的图像采集与处理、 基于TM S320L F2812 的运动控制与参数调整、 数字视频输入、 模拟视频输入、 模拟视频输出、 数字视频输出、 电源变换等功能模块集成在170mm×57mm×40mm 的空间尺寸内。该系统可以安装在移动式修复机器人上、 脱离工控机独立工作, 适用于M IG、T IG、CO 2 等多种焊接工艺方法的过程监控、 焊缝跟踪和焊缝成形实时控制。 关键词: 移动式修焊机器人; 双数字信号处理器嵌入式系统; 视觉反馈控制
上传时间： 2013-10-08
上传用户：xinhaoshan2016
中文版详情浏览：http://www.elecfans.com/emb/fpga/20130715324029.html Xilinx UltraScale:The Next-Generation Architecture for Your Next-Generation Architecture The Xilinx® UltraScale™ architecture delivers unprecedented levels of integration and capability with ASIC-class system- level performance for the most demanding applications. The UltraScale architecture is the industr y's f irst application of leading-edge ASIC architectural enhancements in an All Programmable architecture that scales from 20 nm planar through 16 nm FinFET technologies and beyond, in addition to scaling from monolithic through 3D ICs. Through analytical co-optimization with the X ilinx V ivado® Design Suite, the UltraScale architecture provides massive routing capacity while intelligently resolving typical bottlenecks in ways never before possible. This design synergy achieves greater than 90% utilization with no performance degradation. Some of the UltraScale architecture breakthroughs include: • Strategic placement (virtually anywhere on the die) of ASIC-like system clocks, reducing clock skew by up to 50% • Latency-producing pipelining is virtually unnecessary in systems with massively parallel bus architecture, increasing system speed and capability • Potential timing-closure problems and interconnect bottlenecks are eliminated, even in systems requiring 90% or more resource utilization • 3D IC integration makes it possible to build larger devices one process generation ahead of the current industr y standard • Greatly increased system performance, including multi-gigabit serial transceivers, I/O, and memor y bandwidth is available within even smaller system power budgets • Greatly enhanced DSP and packet handling The Xilinx UltraScale architecture opens up whole new dimensions for designers of ultra-high-capacity solutions.
标签： UltraScale Xilinx 架构
上传时间： 2013-11-13
上传用户：瓦力瓦力hong
Prakash Rashinkar has over 15 years experience in system design and verificationof embedded systems for communication satellites, launch vehicles and spacecraftground systems, high-performance computing, switching, multimedia, and wirelessapplications. Prakash graduated with an MSEE from Regional Engineering College,Warangal, in India. He lead the team that was responsible for delivering themethodologies for SOC verification at Cadence Design Systems. Prakash is anactive member of the VSIA Functional Verification DWG. He is currently Architectin the Vertical Markets and Design Environments Group at Cadence.
上传时间： 2014-01-24
上传用户：xinhaoshan2016
The LogiCORE™ GTP Wizard automates the task of creating HDL wrappers to configure the high-speed serial GTP transceivers in Virtex™-5 LXT and SXT devices. The menu-driven interface allows one or more GTP transceivers to be configured using pre-definedtemplates for popular industry standards, or from scratch, to support a wide variety of custom protocols.The Wizard produces a wrapper, an example design, and a testbench for rapid integration and verification of the serial interface with your custom function Features• Creates customized HDL wrappers to configureVirtex-5 RocketIO™ GTP transceivers• Users can configure Virtex-5 GTP transceivers toconform to industry standard protocols usingpredefined templates, or tailor the templates forcustom protocols• Included protocol templates provide support for thefollowing specifications: Aurora, CPRI, FibreChannel 1x, Gigabit Ethernet, HD-SDI, OBSAI,OC3, OC12, OC48, PCI Express® (PCIe®), SATA,SATA II, and XAUI• Automatically configures analog settings• Each custom wrapper includes example design, testbench; and both implementation and simulation scripts
标签： Transceiver Virtex Wizar GTP
上传时间： 2013-10-23
上传用户：leyesome
提出一种融合Ad hoc网络、GPRS/GSM和PSTN的远程分布式环境状况实时监测系统设计方案。由IEEE 802.15.4标准组建的Ad hoc无线传感器网络负责监测环境温湿度、光照度、煤气及CO浓度等；采用GPRS/GSM模块和嵌入式Modem构造无线网关，实现Ad hoc网络与GPRS/GSM和PSTN的无缝连接，将无线传感器网络采集的数据发送到手机或远端计算机。系统具有小、远和散的特点，可实现多点分布、中央管理、多层报警和远程监测。
上传时间： 2013-11-08
上传用户：semi1981
致力于提供高速信号处理解决方案的北京拓目科技有限公司（Beijing Topmoo Tech Co. Ltd）在2011年推出基于FLASH阵列存储的高端固态存储产品TMS-F231-160G之后，近日宣布推出其入门级固态存储产品TMS-S231-512G。 在容量选择上，TMS-F231-160G可以通过更换PIN2PIN的FLASH芯片而达到扩容目的,但是SLC FLASH成本高居不下，在目前高速发展的工业相机领域，难以推广普及。为了推动高速工业相机存储市场的发展，拓目科技发布了基于SATA接口的SSD盘存储系统TMS-S231-512G，随着消费电子的发展，SSD的单盘容量不断的扩大，价格不断的降低，必然能使TMS-S231-512G得到广泛的应用。 “TMS-S231-512G是一款专门针对航空拍摄、工业照相、汽车碰撞实验等需要高速图像采集、存储的场合而开发的固态存储设备”拓目科技产品经理Lemon Chan介绍道，“该产品的单盘存储容量最高可达512GB，单盘存储带宽则最高可达250MB/s，在该带宽支持条件下，TMS-S231-512G最高能支持1280x1024@200fps的连续拍照模式，几乎适用于所有需要高速图像采集的场合”。 “目前，Camera Link接口在航空相机、工业相机等领域得到广泛应用。与此同时，TMS-S231-512G板载两个SFP光纤接口，最高可支持5Gbps的有效数据吞吐率。”拓目科技研发总监Steven Wu介绍道，“除了硬件板卡以外，拓目科技还提供一整套完整的客户端解决方案，以方便客户能够轻易地对设备进行管控，同时方便客户对记录下来的数据进行预览、下载等操作”。 “与国外同类产品相比，TMS-S231-512G除了大容量、高带宽等优点以外，另一大优势在于其极强的可定制性。TMS-S231-512G从硬件设计到软件开发，所有的核心技术都由拓目科技研发团队自主开发，相比于国外同类产品，拓目科技无论在产品的可定制性还是售后技术支持方面，都具有较大的优势”Steven Wu补充道。 同时，该款产品所有器件均采用工业级宽温芯片，温度、振动等环境适应性试验均已顺利通过，能最大程度地保证产品在恶劣环境下的可靠性。 TMS-S231系列产品特点 1， 采用业界领先的掉电保护技术，令您的数据安全无忧 2， 性能卓越，拥有单盘高达250MB/s的写带宽 3， 单盘64GB~512GB大容量可选，存储容量大小也可以根据用户需求定制 4， 支持Camera Link视频输入接口 5， 支持DVI显示接口 6， 支持SFP光纤接口 7， 支持2个SSD盘 8， 支持1个千兆以太网口 9， 满足各种恶劣环境应用要求，能在高温度、多灰尘、高海拔、强振动等应用场合下正常使用 TMS-S231采用12V电源适配器供电，功耗小于10W，TMS-S231集成度非常高，产品体积仅为260mm x 180mm x 45mm，如上图所示。TMS-S231现已进入大批量生产阶段并随时接受客户试用申请与订货。
上传时间： 2013-11-12
上传用户：a155166
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
