本文選題：嵌入式系統(tǒng)　切入點：數據采樣　出處：《太原理工大學》2012年碩士論文　論文類型：學位論文

【摘要】：隨著計算機技術與嵌入式技術的不斷進步,網絡已成為日常交流中最重要的通信工具,而小型的嵌入式設備與Internet通信也逐步成為發(fā)展的趨勢。本文介紹了嵌入式系統(tǒng)具有的優(yōu)勢和以太網技術發(fā)展的方向,分析了把嵌入式技術與網絡技術結合在一起的可能性。通過進一步了解嵌入式以太網技術產生的背景和目前發(fā)展的狀況,指出了本文研究的重要意義。 嵌入式終端系統(tǒng)實現網絡功能主要有三種解決方案,采用專門的網絡處理芯片,嵌入式操作系統(tǒng)植入微處理器和小型單片機嵌入網絡協(xié)議棧。分析比較三種方案各自的優(yōu)缺點,本文的設計方案選擇單片機嵌入TCP/IP協(xié)議棧的方法來實現。 系統(tǒng)的主控制器選用TI公司的高性能、低功耗單片機MSP430F5438,從控制器選用微芯科技公司生產的網卡控制器ENC28J60來實現嵌入式的網絡終端的設計和開發(fā)。本文的設計包括軟件和硬件兩大部分,硬件部分主要包括電源電路的設計、看門狗電路的設計、串口電路的設計以及單片機與網卡控制器接口電路的設計；軟件部分主要包括看門狗程序的設計、以太網控制器驅動程序的編寫和TCP/IP協(xié)議的裁剪,在此基礎上實現了應用層的Modbus協(xié)議。 在本文設計的終端系統(tǒng)中主控制器實現程序寫入并與從控制器進行數據通信,同時從控制器通過網絡變壓器擴展出一個網絡接口RJ45來實現與本地的局域網的通信,然后將裁剪的、適合單片機使用的TCP/IP協(xié)議通過仿真器寫到單片機的Flash中,在這個過程中主要是對網絡協(xié)議進行分析并把適合嵌入式系統(tǒng)的UIP協(xié)議棧移植到微控制器中。 通過分析應用層的協(xié)議,在主控制器的內部存儲器中實現了基于UDP傳輸協(xié)議的Modbus協(xié)議。系統(tǒng)通過采樣電路可以把現場的數據進行采集,并通過串口發(fā)送到系統(tǒng)的內部存儲器中。與此同時,在遠端的主機可以直接向網絡終端發(fā)送命令實現對嵌入式網絡終端的控制。系統(tǒng)真正實現了對數據的遠端測試和對現場設備的遠程控制,操作起來方便,應用也比較廣泛。隨著嵌入式技術和網絡的不斷發(fā)展融合,本文實現的將嵌入式網絡技術應用在工業(yè)控制和遠程監(jiān)控領域具有重要的意義。
[Abstract]:With the development of computer technology and embedded technology, the network has become the most important communication tool in daily communication. The communication between small embedded devices and Internet has gradually become a trend of development. This paper introduces the advantages of embedded systems and the development direction of Ethernet technology. This paper analyzes the possibility of combining embedded technology with network technology, and points out the significance of this study by further understanding the background of embedded Ethernet technology and the current development situation. There are three kinds of solutions to realize network function in embedded terminal system, which adopt special network processing chip. The embedded operating system is embedded in the microprocessor and the small microcontroller is embedded in the network protocol stack. The advantages and disadvantages of the three schemes are analyzed and compared. The method of embedding the TCP/IP protocol stack into the single chip microcomputer is selected for the design of this paper. The main controller of the system is the high performance of TI Company. MSP430F5438, a low-power single-chip microcomputer, is designed and developed by ENC28J60, a network card controller produced by Microcore Technology Company. The design of this paper includes two parts: software and hardware. The hardware part mainly includes the design of power supply circuit, watchdog circuit, serial port circuit and interface circuit between MCU and network card controller, and the software part mainly includes the design of watchdog program. The driver of Ethernet controller and the clipping of TCP/IP protocol are written, and the Modbus protocol of application layer is implemented. In the terminal system designed in this paper, the master controller realizes the program writing and data communication with the slave controller. At the same time, the controller extends a network interface RJ45 through the network transformer to realize the communication with the local local area network. Then the TCP/IP protocol which is cut and suitable for MCU is written into the Flash of MCU by simulator. In this process, the network protocol is analyzed and the UIP protocol stack suitable for embedded system is transplanted to the microcontroller. By analyzing the protocol of the application layer, the Modbus protocol based on UDP transmission protocol is implemented in the internal memory of the main controller. And send it to the internal memory of the system through serial port. At the same time, The remote host can send commands directly to the network terminal to realize the control of the embedded network terminal. With the development of embedded technology and network, the application of embedded network technology in industrial control and remote monitoring is of great significance.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TP393.0;TP368.1

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