基于DM6446和Qt的嵌入式圖形界面的研究與應(yīng)用.pdf

1、摘要由于片上系統(tǒng)、無線通信、視覺應(yīng)用、汽車電子等多種技術(shù)的快速發(fā)展和大力推動(dòng)，嵌入式Linux系統(tǒng)在視頻領(lǐng)域的應(yīng)用越加廣泛。與此同時(shí)，嵌入式圖形用戶界面GUI，作為嵌入式操作系統(tǒng)重要組成部分，已經(jīng)成為制約嵌入式終端產(chǎn)品能否成功上市的關(guān)鍵性因素。本文以TI高性能的雙核芯片DM6446為硬件基礎(chǔ)，以嵌入式圖形界面開發(fā)為核心，對(duì)達(dá)芬奇技術(shù)和DM6446芯片的軟硬件架構(gòu)作了簡要概述，并在此基礎(chǔ)上詳細(xì)闡述了DM6446軟件開發(fā)平臺(tái)的搭建過程，包括

2、交叉編譯環(huán)境的建立、系統(tǒng)引導(dǎo)程序的更新及內(nèi)核配置和移植。通過對(duì)當(dāng)前主流嵌入式GUI全面的分析、對(duì)比，從其主要應(yīng)用的領(lǐng)域、可移植性和應(yīng)用程序開發(fā)周期等角度出發(fā)，確定使用Qt為DM6446平臺(tái)構(gòu)建嵌入式GUI。文中對(duì)Qt4的開發(fā)流程和主要機(jī)制作了簡要闡述，實(shí)現(xiàn)了Qt4在DM6446目標(biāo)平臺(tái)上的移植。同時(shí)基于Qt4開發(fā)設(shè)計(jì)了能實(shí)現(xiàn)視頻采集和顯示功能的嵌入式圖形用戶界面應(yīng)用程序，主要包括視頻采集與顯示的多窗口圖形界面設(shè)計(jì)和ARM端視頻采集、處理

3、和顯示的多線程實(shí)現(xiàn)。交叉編譯嵌入式視頻圖形用戶界面應(yīng)用程序，并將生成的可執(zhí)行文件通過NFS網(wǎng)絡(luò)文件系統(tǒng)掛載至目標(biāo)平臺(tái)運(yùn)行，測試表明該視頻程序?qū)崿F(xiàn)了多窗口圖形界面與多線程視頻應(yīng)用程序之間的通信，并且實(shí)現(xiàn)了視頻圖像的實(shí)時(shí)采集和實(shí)時(shí)顯示。關(guān)鍵詞：DM6446；Qt4；內(nèi)核移植嵌入式圖形用戶界面AbstractIIIllIIIllIIlllIllIIIlY2088472Duetotherapiddevelopmentandvigorouspro

4、motionofvarioustechnologies，such雒SOC，wirelesscommunicationvisualapplicationandautomotiveelectronicstechnologytheEmbeddedLinuxsystemiswidelyappliedinthevideoprocessingfieldMeanwhile，theembeddedgraphicaluserinterface，嬲anim

5、portantcomponentofembeddedoperatingsystem，haSalreadybecomethekeyfactoroftheembeddedterminalproductsSUCCESSonthemarketBaSedonDM6446whichisTIhi曲一performancedualcorechip，andtakenembeddedgraphicsinterfacedevelopment邪thecore，

6、DaVmciTechnologyandthearchitectureofDM6446，includinghardwareandsoftware，werebrieflyintroducedinthispaperOnthisbasis，thebuildingprocessofDM6446softwaredevelopmentplatformweredetailed，includinghowtobuildingthecrosscompilee

7、nvironmentupdatingsystembootprogramandtransplantingkernelThroughthecomprehensiveanalyzingandcomparingthecurrentmainstreamembeddedGUI，theQtWaSselectedtoconstructembeddedGUIonDM6446platformInthispaperthedevelopmentprocessa

8、ndthemainmechanismofQt4werebrieflydescribed，andtheQt4WaStransplantedsuccessfullyonthetargetplatformAtthesametime，basedontheQt4，theembeddedvideoGUIprojectaboutvideocaptureanddisplayweredevelopedanddesignedconsistingofdesi

9、gnofmultiwindowinterface，developmentofmultithreadvideoapplicationonARMCross—compilingembeddedvideographicaluserinterfaceapplicationsinordertogenerateexecutablefilesAfterthattheexecutablefilesWasrunonthetargetplatformthro

10、ughtheNFSnetworkfilesystemTheresultshowedthatthecommunicationbetweenvideoapplicationsandmultiwindowGUlwasimplemented，andtherealtimedisplayofvideoimagesWaSachievedKeyword：DM6446；Qt4；Kerneltransplant；graphicaluserinterface