【正文】 linux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)換設備的開發(fā)。該設備支持服務器和客戶機模式， 為傳統(tǒng)串口設備通過標準TCP/IP協(xié)議接入Inter提供了一種低成本解決方案。 關(guān)鍵詞 ：串口 ；以太網(wǎng)；S3C44BOX；RTL8019AS；TCP／IP ；uclinux ；武漢工業(yè)學院 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。 uclinux武漢工業(yè)學院 2020 畢業(yè)論文第 3 頁 共 28 頁目 錄摘 要 .........................................................................................................................................................1ABSTRACT...............................................................................................................................................2前 言 ...........................................................................................................................................................4一 設計概述 ...............................................................................................................................................5 設計要求 .........................................................................................................................................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 晶振電路與復位電路 ...................................................................................................12 實時時鐘電路 ...............................................................................................................14 FLASH 存儲器接口電路 ................................................................................................................14 SDRAM 接口電路 ............................................................................................................................16 外圍接口電路設計 .......................................................................................................................17 JTAG 接口電路 ..............................................................................................................17 RS232 接口電路 ............................................................................................................18 通用 I/O 接口電路 .......................................................................................................19四. 硬件電路板的調(diào)試和測試 .........................................................................