【正文】 of all,we describes the embedded print terminal design concept (including the working principle,design and choise),then we summarized the devising of hardware and software also introduction SAMSUNG’s S3C2410 SoC,the ARM9 core 32bit RISC processor,and focused on the circuit connecting design,the printer deriver and the main application development in Linux baded on this platform. The core codes were also analyzed at each step. At the end of this paper,we summed up our work and suggested some improvement. Key words： S3C2410； embedded system； Linux； Printer driver； Application 南華大學電氣工程學院課程設(shè)計 目 錄 1 緒論 ............................................................................................................................ 1 課題來源及其意義 .......................................................................................... 1 嵌入式系統(tǒng)的定義及特點 .............................................................................. 1 嵌入式系統(tǒng)的定義 ................................................................................ 2 嵌入式系統(tǒng)的特點 ................................................................................ 2 嵌入式系統(tǒng)的現(xiàn)狀和發(fā)展趨勢 ...................................................................... 3 嵌入式系統(tǒng)的現(xiàn)狀 ................................................................................ 3 嵌入式系統(tǒng)的發(fā)展趨勢 ........................................................................ 3 嵌入式打印技術(shù)簡介 ...................................................................................... 4 本設(shè)計的主要內(nèi)容 .......................................................................................... 4 2 嵌入式打印終端系統(tǒng)的設(shè)計概念 ............................................................................ 5 嵌入式打印終端系統(tǒng)的組成及原理 .............................................................. 5 嵌入式打印終端系統(tǒng)設(shè)計方案 ...................................................................... 5 嵌入式處理器平臺的選擇 .................................................................... 5 嵌入式操作系統(tǒng)的選擇 ........................................................................ 6 嵌入式打印終端系統(tǒng)設(shè)計方案 ............................................................ 6 嵌入式系統(tǒng)設(shè)計流程 .................................................................................... 7 3 系統(tǒng)硬件設(shè)計 .......................................................................................................... 7 硬件開發(fā)平臺 S3C2410 介紹以及結(jié)構(gòu) ......................................................... 8 存儲器 ............................................................................................................ 11 串行接口 ........................................................................................................ 11 打印機與開發(fā)板接口電路的設(shè)計（ I/O PORTS） ..................................... 12 4 嵌入式 Linux 平臺構(gòu)建 .......................................................................................... 14 建立交叉編譯環(huán)境 ........................................................................................ 14 配置 BootLoader............................................................................................ 15 BootLoader 概述 ................................................................................... 15 Uboot ................................................................................................... 15 南華大學電氣工程學院課程設(shè)計 嵌入式 Linux 內(nèi)核移植 ................................................................................ 16 安裝根文件系統(tǒng) ............................................................................................ 16 創(chuàng)建根文件系統(tǒng)的基本目錄結(jié)構(gòu) ...................................................... 16 構(gòu)建 BusyBox ...................................................................................... 17 5 嵌入式打印終端系統(tǒng)的軟件設(shè)計 .......................................................................... 19 微型打印機驅(qū)動的設(shè)計 ................................................................................ 19 Linux 設(shè)備驅(qū)動 .................................................................................... 19 打印驅(qū)動的實現(xiàn) .................................................................................. 19 串口的設(shè)置與讀寫 ........................................................................................ 20 串口的設(shè)置 .......................................................................................... 20 編寫讀取掃描儀數(shù)據(jù)函數(shù) .................................................................. 21 客戶端和服務(wù)器的 socket 編寫 ......................................................... 21 主應(yīng)用程序的設(shè)計 ........................................................................................ 21 6 總結(jié) 與體會 .............................................................................................................. 23 總結(jié) ................................................................................................................ 23 體會 ................................................................................................................ 23 參考文獻 ...................................................................................................................... 25 南華大學電氣工程學院課程設(shè)計 第 1 頁 共 30 頁 1 緒論 課題來源及其意義 隨著計算機技術(shù)的發(fā)展，嵌入式系統(tǒng)已經(jīng)成為計算機領(lǐng)域的一個重要部分，是繼 PC 和 Inter 以后又一個新的 IT 熱點。它主要由嵌入式微處理器、外圍硬件設(shè)備、嵌入式操作系統(tǒng)以及用戶應(yīng)用軟件等部分組成。這種系統(tǒng)的結(jié)構(gòu)和功能相對單一，價格低，因此以前在國內(nèi)工業(yè)領(lǐng)域應(yīng)用較為普遍，但是現(xiàn)在已經(jīng)遠遠不能適應(yīng)高效的、需要大容量存儲的現(xiàn)代工業(yè)控制和新興信息家電等領(lǐng)域的需求?；?ARM9和 Linux的嵌入式系統(tǒng)既具有以 ARM為內(nèi)核的 32 位微處理器的優(yōu)良特性，也盡可能地發(fā)揮了 Linux 操作系