在研究传统家用燃气报警器的基础上，以ZigBee协议为平台，构建mesh网状网络实现网络化的智能语音报警系统。由于传感器本身的温度和实际环境温度的影响，传感器标定后采用软件补偿方法。为了减少系统费用，前端节点采用半功能节点设备，路由器和协调器采用全功能节点设备，构建mesh网络所形成的家庭内部报警系统，通过通用的电话接口连接到外部的公用电话网络，启动语音模块进行报警。实验结果表明，在2.4 GHz频率下传输，有墙等障碍物的情况下，节点的传输距离大约为35 m，能够满足家庭需要，且系统工作稳定，但在功耗方面仍需进一步改善。 Abstract: On the basis of studying traditional household gas alarm system, this paper proposed the platform for the ZigBee protocol，and constructed mesh network to achieve network-based intelligent voice alarm system. Because of the sensor temperature and the actual environment temperature, this system design used software compensation AFTER calibrating sensor. In order to reduce system cost, semi-functional node devices were used as front-end node, however, full-function devices were used as routers and coordinator，constructed alarm system within the family by building mesh network，connected to the external public telephone network through the common telephone interface, started the voice alarm module. The results indicate that nodes transmit about 35m in the distance in case of walls and other obstacles by 2.4GHz frequency transmission, this is able to meet family needs and work steadily, but still needs further improvement in power consumption.
上传时间： 2013-10-30
上传用户：swaylong
This example shows how to update at regulate period the WWDG counter using theEarly Wakeup interrupt (EWI). The WWDG timeout is set to 262ms, refresh window set to 41h and the EWI isenabled. When the WWDG counter reaches 40h the EWI is generated and in the WWDGISR the counter is refreshed to prevent a WWDG reset and led connected to PC.07is toggled.The EXTI line9 is connected to PB.09 pin and configured to generate an interrupton falling edge.In the NVIC, EXTI line9 to 5 interrupt vector is enabled with priority equal to 0and the WWDG interrupt vector is enabled with priority equal to 1 (EXTI IT > WWDG IT). The EXTI Line9 will be used to simulate a software failure: once the EXTI line9event occurs (by pressing Key push-button on EVAL board) the correspondent interruptis served, in the ISR the led connected to PC.07 is turned off and the EXTI line9pending bit is not cleared. So the CPU will execute indefinitely EXTI line9 ISR andthe WWDG ISR will never be entered(WWDG counter not updated). As result, when theWWDG counter falls to 3Fh the WWDG reset occurs.If the EXTI line9 event don抰 occurs the WWDG counter is indefinitely refreshed inthe WWDG ISR which prevent from WWDG reset. If the WWDG reset is generated, AFTER resuming from reset a led connected to PC.06is turned on. In this example the system is clocked by the HSE(8MHz).
上传时间： 2013-11-11
上传用户：gundamwzc
This application note describes how to retrieve user-defined data from Xilinx configurationPROMs (XC18V00 and Platform Flash devices) AFTER the same PROM has configured theFPGA. The method to add user-defined data to the configuration PROM file is also discussed.The reference design described in this application note can be used in any of the followingXilinx FPGA architectures: Spartan™-II, Spartan-IIE, Spartan-3, Virtex™, Virtex-E, Virtex-II,and Virtex-II Pro.
上传时间： 2013-10-09
上传用户：guojin_0704
The Virtex™-4 user access register (USR_ACCESS_VIRTEX4) is a 32-bit register thatprovides direct access to bitstream data by the FPGA fabric. It is useful for loadingPowerPC™ 405 (PPC405) processor caches and/or other data into the FPGA AFTER the FPGAhas been configured, thus achieving partial reconfiguration. The USR_ACCESS_VIRTEX4register is programmed through the bitstream with a command that writes a series of 32-bitwords.
标签： USR_ACCESS PowerPC XAPP 719
上传时间： 2013-12-23
上传用户：yuanwenjiao
针对嵌入式机器视觉系统向独立化、智能化发展的要求，介绍了一种嵌入式视觉系统--智能相机。基于对智能相机体系结构、组成模块和图像采集、传输和处理技术的分析，对国内外的几款智能相机进行比较。综合技术发展现状，提出基于FPGA+DSP模式的硬件平台，并提出智能相机的发展方向。分析结果表明，该系统设计可以实现脱离PC运行，完成图像获取与分析，并作出相应输出。 Abstract: This paper introduced an embedded vision system-intelligent camera ，which was for embedded machine vision systems to an independent and intelligent development requirements. Intelligent camera architecture， component modules and image acquisition， transmission and processing technology were analyzed. AFTER comparing integrated technology development of several intelligent cameras at home and abroad， the paper proposed the hardware platform based on FPGA+DSP models and made clear direction of development of intelligent cameras. On the analysis of the design， the results indicate that the system can run from the PC independently to complete the image acquisition and analysis and give a corresponding output.
上传时间： 2013-11-14
上传用户：无聊来刷下
Have you had the exasperating experience of a laptop orPDA defi antly not responding to your commands? Youfrantically press key AFTER key, but to no avail. As hopeturns to anger (but just before you throw the company’slaptop through the window) you slam your fi nger againstthe on/off power button. Ten seconds later, your laptopfi nally surrenders and the screen goes black in a highpitched whimper.
上传时间： 2013-12-10
上传用户：Vici
MemCheck Driver Memory Tool The MemCheck code is designed to provide Windows NT/2K/XP driver developers with a tool to help in the detection of the following memory handling issues: Buffer overrun Buffer corruption Buffer use AFTER buffer release Double buffer releases
标签： MemCheck designed Windows develop
上传时间： 2014-12-05
上传用户：weiwolkt
Conservator extends on the concept of a Flyweight Factory by allowing shared Flyweight objects to be mutated AFTER creation without undesired side effects.
标签： Flyweight Conservator allowing extends
上传时间： 2014-01-06
上传用户：cuibaigao
《代码大全》的英文版名称是 Code Complete: A Practical Handbook of Software Construction。 它获得1993年美国软件开发杂志Jolt大奖，被美国包括MIT在内的十多所大学作为计算机软件学科的教材。 作者Steve McConnell的另外三本著作是 Rapid Development，Software Project Survival Guide ，AFTER the Gold Rush 。 本软件设计实用手册内容覆盖了开发过程中最重要部分的艺术性和科学性。 其焦点在于成功的程序设计技术。
标签： Construction Practical Complete Handbook
上传时间： 2015-02-17
上传用户：songnanhua
dances Act now and you ll be given a free membership to a top Internet firm who is changing people s lives for the better.Mary L. White of LA. stays at home with her children and works just 3 1/2 hours a day... she now earns twice as much money as she did before. Frank Herns Jr. of NY takes 2 vacations a year to the Caribbean and enjoys more time and freedom than ever before. Jane Kennedy of FL fired her boss AFTER 5 months. She finally has the time and money she needs to complete her college education. Craig Garcia of CA tripled his income in just 90 days because took advantage of his free membership.
标签： membership Internet changing dances
上传时间： 2015-03-08
上传用户：xhz1993
