【正文】 武 漢 工 業(yè) 學(xué) 院畢業(yè)設(shè)計(論文)設(shè)計題目：TCP/IP 與 RS232 協(xié)議轉(zhuǎn)換器的設(shè)計（硬件）姓 名： 學(xué) 號： 院 （系）： 專 業(yè)： 指導(dǎo)教師： 2020 年 6 月 13 日武漢工業(yè)學(xué)院 2020 畢業(yè)論文第 1 頁 共 28 頁摘 要本次畢業(yè)設(shè)計的課題是“TCP/IP與RS232協(xié)議轉(zhuǎn)換器的設(shè)計” ，主要以ARM7系列的S3C44BOX微處理器和RTL8019AS網(wǎng)絡(luò)接口芯片等構(gòu)建嵌入式系統(tǒng)，移植uClinux，并在RH Linux 90和uclinux為ARM 處理器提供的交叉開發(fā)工具下，完成基于TCP／IP協(xié)議的串口／以太網(wǎng)數(shù)據(jù)轉(zhuǎn)換設(shè)備的開發(fā)。該設(shè)備支持服務(wù)器和客戶機模式， 為傳統(tǒng)串口設(shè)備通過標準TCP/IP協(xié)議接入Inter提供了一種低成本解決方案。本文主要描述了單串口以太網(wǎng)協(xié)議轉(zhuǎn)換，實現(xiàn) RS232 串口數(shù)據(jù)流的收／發(fā)控制，封裝／拆封串口幀，并通過 TCP／IP 協(xié)議轉(zhuǎn)換模塊將以太網(wǎng)發(fā)送緩沖區(qū)的串口幀封裝在 UDP 包中，并傳給 IP 層；同時，接收以太網(wǎng)數(shù)據(jù)幀并向上層層解包，分離應(yīng)用層數(shù)據(jù)，然后數(shù)據(jù)的解析處理交由串口發(fā)送模塊完成，實現(xiàn) RS232 串口流與以太網(wǎng)端口流的透明轉(zhuǎn)換。 關(guān)鍵詞 ：串口 ；以太網(wǎng)；S3C44BOX；RTL8019AS；TCP／IP ；uclinux ；武漢工業(yè)學(xué)院 2020 畢業(yè)論文第 2 頁 共 28 頁AbstractThis graduation project topic is “Serial port／Ether data transfer based on uClinux operation system ”, Embedded system based on ARM7 MCU S3C44BOX and work interface chip RTL80 1 9AS is developed，On which uClinux operation system is ported．Serial port／Ether data transfer device through TCP／IP protocol is developed under RH Linux 9．0 and uClinux cross envelopment tools for ARM．Server and client mode are supported．It provides a low—cost solution for traditional serial—interfaced equipment to connect with the Inter．This article describes the single serial port / Ether data transfer by TCP／IP protocol . It realizes RS232 serial data stream receive /transfer , Packaging / unsealed serial frame. Under the TCP protocol conversion module, these data could be sent serial UDP packet encapsulation in Ether frame buffer , and transmit IP layer。 or could be received through receiving Ether data frames to layer on the package, separating the application layer data. Implementation RS232 serial port / Ether port data flow transparent transfer.Key words Serial port；Ether；S3C44BOX；RTL8019AS；TCP／IP 。 uclinux武漢工業(yè)學(xué)院 2020 畢業(yè)論文第 3 頁 共 28 頁目 錄摘 要 .........................................................................................................................................................1ABSTRACT...............................................................................................................................................2前 言 ...........................................................................................................................................................4一 設(shè)計概述 ...............................................................................................................................................5 設(shè)計要求 .........................................................................................................................................5 系統(tǒng)結(jié)構(gòu)框圖 .................................................................................................................................5二 模塊電路的介紹 ...................................................................................................................................7 主控制器 S3C44BOX ......................................................................................................................7 TCP／IP 協(xié)議轉(zhuǎn)換模塊 ..................................................................................................................8 串口收發(fā)控制模塊 ...........................................................................................................................8 MAX232 接口電路 ............................................................................................................................8 以太網(wǎng)接口控制芯片 RTL8019AS..................................................................................................8三. 系統(tǒng)硬件選型 .....................................................................................................................................9 協(xié)議轉(zhuǎn)換處理 CPU 選擇 .................................................................................................................9 S3C44B0X 的引腳分析及系統(tǒng)配置電路 ........................................................................9 串口引腳描述及其與 S3C44B0X 的接口引腳描述 ......................................................10 電源電路 .......................................................................................................................11 晶振電路與復(fù)位電路 ...................................................................................................12 實時時鐘電路 ...............................................................................................................14 FLASH 存儲器接口電路 .....................................................................................................