基于Linux内核的嵌入式串口通讯程序设计

文档编号:TX248  文档字数:13461,页数:28

摘   要
 本设计讨论了简易嵌入式Linux环境下的串口联网问题。
 在如今的工业控制领域，嵌入式设备通讯能力的优劣已经成为了一个尤为重要的评判标准，是否能够进行网络通信将是十分重要的。对于由于特殊要求而不能订制一些网络硬件的嵌入式设备来说，我们希望通过最为简单且经济的方式来解决网络问题，由此我们自然希望在尽力不改变设备原有资源的情况下给设备添加网络功能，并且将设备原先的功能所产生的冲突减到最小，选择具有普遍广泛应用的串口来实现串口联网将是十分具有现实意义的。
 本设计通过使用虚拟一些联网必备的网络硬件，通过串口来通信的方法来完成联网的实现，具体涉及到伪网络驱动程序和串口通信程序的开发。在不保证可靠通信和吞吐量的前提下，该设计能够实现简单的网络通信，包括Telnet等。
 
关键字：Linux环境，串口通讯，网络通讯，嵌入式

Design Of Embedded Serial Communication Based On Linux
Abstract
 This design researches serial networking which runs under the simple kernel of Linux.
 Now in the field of industrial control, the capacity of communications has become a particularly important evaluation criterion in the embedded equipment. For some embedded equipments as a special request which can not be made in some of the embedded network hardware equipments, we hope that through the most simple and economical way to solve network problems. By the time we naturally hope to make every effort not to change the original equipment resources that we can add to the network function under the equipment, and the original equipment functions arising from the conflict could be minimized. It is very realistic significance to select the widespread application serial to achieve serial network link.
 The design takes the use of virtual networking to pretend some essential network hardware. Through serial communications to approach to the realization of network link, it will be specifically related to the pseudo-network driver and serial communication program development. Without guaranteed throughput and reliable communications on the premise the design can be achieved by simple network communications, including Telnet and so on.

Keywords：Linux,serial communication,network,embedded

目  录
1绪论 1
 1.1网络通信 1
 1.1.1网络通信原理 1
 1.1.2网络通信现状及前景 2
 1.2串口通讯 4
 1.2.1串口通信原理 4
 1.2.2串口通信现状及前景 5
 1.3测试架构 6
2 设计平台及环境简介 7
 2.1硬件平台 7
 2.1.1设计平台 7
 2.1.2通信平台 7
 2.2软件平台 7
 2.2.1嵌入式Linux 7
 2.3虚拟机简介 8
3 串口网络通讯原理设计 10
 3.1简单串口上网的实现原理 10
 3.2串口上网设备加载和注销形式 11
4 串口网络通讯具体开发与实现 13
 4.1字符设备驱动程序 13
 4.2伪网络驱动设备程序 16
 4.3用户空间串口通信程序 19
总结 22
致谢 23
参考文献 24

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