共查询到19条相似文献,搜索用时 187 毫秒
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本文介绍了基于GPRS技术的大口径水表的数据采集系统的设计与实现。系统利用GPRS的Internet接入功能,通过移动公司的网络来实现远程数据采集与数据服务器之间的无线通信。文章介绍了GPRS无线通信原理、水表数据采集系统的硬件构成、TCP/UDP/IP协议的实现以及水表数据短消息编码协议的设计 相似文献
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本文介绍了一种TCP/IP协议族传输处理以太网数据报文过程的ASIC设计——TCP/IP协议栈处理单元的硬件实现。简单介绍了TCP/IP协议栈,着重介绍了TCP/IP协议栈处理单元系统结构和各个模块的设计。硬件实现的TCP/IP协议栈不仅仅提高了系统接入以太网的速度,还大大解放了CPU本身,使其可以更专著于处理其他功能。为各种嵌入式系统脱离PC环境快速接入以太网提供了可能性方案。 相似文献
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基于TCP/Modbus协议的面向多连接信号采集器设计 总被引:1,自引:0,他引:1
进行了基于Modbus协议和TCP/IP协议相结合的远程网络通信协议的研究。在详细分析TCP/IP协议和Modbus协议的基础上,提出对TCP/IP协议进行精简的设计方法,设计了基于TCP/Modbus协议的面向多连接信号采集器,重点分析了信号采集器和多台计算机通过Internet传输数据的方法。该设计方法能实现及时可靠的TCP/Modbus通信,此协议对系统的硬件和软件要求较低,并成功应用于工程实际,对基于TCP/Modbus协议的工业以太网络的具体应用具有一定的现实意义。 相似文献
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使用Altera公司的FPGA来实现TCP/IP卸载引擎(TOE),将TCP/IP协议栈处理工作从主机CPU中移出,提高了主机的处理能力 TCP/IP是一组全世界广泛应用的协议,不仅仅用于Internet,许多私有网络也使用TCP/IP作为其协议组,许多硬件设计都是基于TCP/IP或者相关的协议来开发的.传统的TCP/IP处理网络数据传输过程中,要占用大量的主机CPU资源,为了减轻CPU的压力,一种叫TOE(TCP/IP offload engine,TCP/IP卸载引擎)的技术应运而生.TOE技术对TCP/IP协议栈进行扩展,使部分TCP/IP协议从CPU转移到TOE硬件,减轻CPU的负担. 相似文献
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W3100A在家用监护仪网络接口中的应用 总被引:1,自引:0,他引:1
文章讨论了网络化接口中TCP/IP协议栈的实现方式,着重探讨了基于TCP/IP协议栈芯片W3100A的家用监护仪网络化接口的实现,最后介绍了如何通过Internet获得仪器各种数据的方法。 相似文献
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《电子技术与软件工程》2016,(9)
嵌入式导航计算机系统在当下得到了较为广泛地应用,本文主要探讨了嵌入式导航计算机系统设计的相关内容,通过对其结构以及硬件特点进行分析,利用TCP/IP协议,设计了基于DOS的导航计算机系统,并就系统如何实现进行了相关阐述。 相似文献
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嵌入式Internet中的协议选择 总被引:16,自引:0,他引:16
如何实现TCP/IP协议是嵌入式Internet的关键技术之一,但TCP/IP协议族中的协议数量庞大,系统很难完全实现,合理地选择TCP/IP协议的子集进行实现对于嵌入式系统更具意义,基于这种思想,本文详细论述了协议子集的选择过程,并给出了一个实际的应用实例。 相似文献
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A scheme of transmission control protocol/Internet protocol(TCP/IP) network system based on system-on-programmable chip(SOPC) is proposed for the embedded network communication. In this system, Nios processor, Ethernet controller and other peripheral logic circuits are all integrated on a Stratix Ⅱ field programmable gate array (FPGA) chip by using SOPC builder design software. And the network communication is realized by transplanting MicroC/OS Ⅱ (uC/OS Ⅱ ) operation system and light weight Internet protocol(LwIP). The design idea, key points and the structures of both software and hardware of the system are presented and ran with a telecommunication example. The experiment shows that the embedded TCP/IP network system has high reliability and real-time performance. 相似文献
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实现了一个运行在数字信号处理器TMS320DM642上的嵌入式TCP/IP协议栈。对TCP/IP协议中的IP协议、ARP协议、UDP协议进行分析,完成基于TCP/IP协议的嵌入式网络系统。 相似文献
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The throughput degradation of Transport Control Protocol (TCP)/Internet Protocol (IP) networks over lossy links due to the
coexistence of congestion losses and link corruption losses is very similar to the degradation of processor performance (i.e.,
cycle per instruction) due to control hazards in computer design. First, two types of loss events in networks with lossy links
are analogous to two possibilities of a branching result in computers (taken vs. not taken). Secondly, both problems result
in performance degradations in their applications, i.e., penalties (in clock cycles) in a processor, and throughput degradation
(in bits per second) in a TCP/IP network. This has motivated us to apply speculative techniques (i.e., speculating on the
outcome of branch predictions), used to overcome control dependencies in a processor, for throughput improvements when lossy
links are involved in TCP/IP connections. The objective of this paper is to propose a cross-layer network architecture to improve the network throughput over lossy links. The system
consists of protocol-level speculation based algorithms at transport layer, and protocol enhancements at middleware and network
layers that provide control and performance parameters to transport layer functions. Simulation results show that, compared
with prior research, our proposed system is effective in improving network throughput over lossy links, capable of handling
incorrect speculations, fair for other competing flows, backward compatible with legacy networks, and relatively easy to implement. 相似文献
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嵌入式TCP/IP协议栈在单片机上的实现 总被引:1,自引:0,他引:1
给出单片机上网的可行方案,采用SST89E564RD单片机,既提供了网关服务,也实现了在线仿真和下载的功能。由于51单片机资源有限,精简了TCP/IP协议族,在8位单片机上实现了UDP、TCP、ICMPI、P、ARP协议,为嵌入式系统通过以太网接入Internet打下了基础。经过几个月的软硬件测试表明:系统设计合理、稳定可靠。 相似文献
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网络开发套件(NDK)是TI公司推出的数字信号处理器(DSP)网络应用程序开发平台。先对传输控制协议/因特网协议(TCP/IP)协议栈以及网络开发工具包进行了详细的研究,然后讨论了套接字socket的编程方法,最后给出一种双DSP网络通信方法。 相似文献
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为了实现智能家居系统中的远程及近程控制,从物联网的概念出发,设计实现了一个嵌入式的WEB网关服务器,将基于Zigbee协议的无线传感器网络与基于TCP/IP协议的Internet相联。该设计采用STM32F107VC为主控制器,通过串口实现与WSN协调器的通信,外接一个网卡芯片实现与Internet的连接。在软件设计上重点实现智能家居通信控制系统,并引入嵌入式操作系统uCOS-II对系统资源进行管理,移植LwIP协议栈实现TCP/IP的基本功能。 相似文献
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WiMedia, Wi-Fi, WiMax, Wi-Mobile, WiRAN, the Wi-family is getting bigger; so does the network architecture. It is encouraging
to see the fast development of the new IEEE wireless technologies promising the ultimate Internet service deployment on wireless
and mobile infrastructures since they would offer larger bandwidth at cheaper price compared to the telecommunication wireless
radio resource. However it is disquieting to see that the TCP/IP protocol stack which is supposed to be the heart of the Internet
services deployment is not evolving as fast as the wireless technologies do. Here we come up with the hard question which
is the network performance of the TCP/IP architecture over wireless networks. It is probably too early to decide to replace
TCP/IP by another protocol stack for wireless network support, but it is important to not ignore the problem and analyse the
main drawbacks of TCP/IP in wireless networks and think about a new architecture of network communication over the wireless
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This paper provides a brief survey of what we name here the Wi-family wireless technologies, and emphasizes on new network
architecture to optimize the TCP/IP behaviour worsen by the wireless characteristics. 相似文献