共查询到20条相似文献，搜索用时 62 毫秒
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详细介绍了一种利用USB转UART桥接芯片CP2102来完成气动打标机USB接口设计的方法.首先对各种USB接口芯片进行比较,完成USB接口芯片的选型.然后简单描述气动打标机的系统设计,重点介绍USB接口硬件电路设计和软件设计.在软件设计中利用Keil C51开发工具μVision2的集成开发环境和VC++实现了单片机与上位机的通信协议.经实际应用表明,本设计具有低成本、设计简单等优点,能够完成单片机与上位机之间准确、快速地数据传输. 相似文献
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介绍了通用串行总线标准(USB)接口芯片CH372的性能,描述了USB通信技术在热能信息采集系统中应用的总体结构设计,具体讨论了USB接口芯片的应用电路设计,并对应用系统的部分固件程序、设备驱动程序的编程方法及单片机通过USB接口与PC机进行通信的方法进行了阐述。 相似文献
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本文以WINDOWS作为主机操作平台,基于PHILIPS的D12SMART开发板,研究了D12开发板与PC主机之间USB数据通信的设计与实现。分析了USB1．1通信协议和PDIUSBD12芯片的工作性能与特点,探讨了对板载单片机fireware固件程序的设计和通信测试程序的设计,研究了单片机对USB控制芯片D12的控制和数据传输,以及与上机位的通信,实现了基于D12开发板和PC机的USB数据通信,表明USB技术有着广阔发展和应用前景。 相似文献
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USB接口实验平台的研制 总被引：1，自引：0，他引：1
介绍了以STC89LE58AD单片机为核心的基于CH372接口芯片的USB实验平台的硬件电路,分析了该平台与PC机的通信协议及程序设计。 相似文献
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基于USB接口与LabVIEW的数据采集系统设计 总被引：3，自引：2，他引：1
设计了基于USB接口与LabVIEW的数据采集系统.单片机将采集到的信号通过USB接口与串口间的桥接控制器——PL2303传输到PC机,通过LabVIEW进行分析处理.整个系统分为数据采集和数据处理2部分.实验证明,系统能实时精确地显示单片机采集的信号. 相似文献
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针对一种基于USB的无线触摸鼠标板的设计与实现方法,给出了较为详细的设计和实现过程。该设计结合了USB和无线设备的优点,将手持端的鼠标触摸板控制信息通过无线发送到接收端并通过USB接口与主机PC实现交互通信。整个系统主要由PIC16F877A单片机,PDIUSBD12芯片,CC2420无线模块,PS/2鼠标触摸板实现。 相似文献
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随着通用串行总线(USB)技术的发展，USB接口优越的传输特性和USB设备的易用性极大地促进了USB技术在各种外设中的应用，USB接口已经成为PC机的标准配置。在传输距离允许的情况下，实现仪器和仪表的USB接口不但已经成为一种现实的需求，而且在技术上也成为可能。本论文从实现带有USB接口的电压监测仪的角度出发，在借鉴了国内外相关USB理论和技术的基础上，采用USB控制芯片PDIUSBD12实现了一个电压监测仪的USB外围设备。使用Microsoft推荐的win32驱动程序模型设计了USB仪表的驱动程序以提供仪表设备的安装。此外，论文分析了WDM驱动程序模型，探讨了WDM驱动程序设计的方法，为建立实用的系统提供了参考。 相似文献
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基于USB通信的电机控制与数据采集实验系统设计 总被引：1，自引：1，他引：0
设计了一个开放灵活的USB通信实验系统,采用PDIUSBD12作为USB接口芯片,以单片机AT89C52和计算机主机进行数据通信。实现了基于USB通信的实时模拟数据采集,步进电机控制和数字接口扩展设计,为学生提供了便利的软硬件实验平台,可以自行组合或开发多种实验。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献