基于嵌入式系統的串口型液晶顯示屏開發(fā).pdf

1、西安科技大學碩士學位論文基于嵌入式系統的串口型液晶顯示屏開發(fā)姓名：李曉婷申請學位級別：碩士專業(yè)：電路與系統指導教師：李文峰2011Subject:TheDevelopmentofaSerialTypeLCDBasedonEmbeddedSystemSpecialty:CircuitsSystemsName:LiXiaoting(Signature)Instruct:LiWenfeng(Signature)ABSTRACTWithther

2、apiddevelopmentofthedisplaytechnologytheembeddedtechnologythedisplaytechnologybasedontheembeddedsystemhasbeenwidelyusedinmanyfields.Asonewayoftherealizationofthehumancomputercommunicationvisualizationthedisplaysystemispu

3、tfwardhigherrequirementsonimagequalitydisplaycontentotherfunctioninthefieldsofindustrialcontrol.Indertochangethedisadvantagesoflowimagequalityslowtransmissionspeedsingledisplaycontentsofthepresentserialtypeliquidcrystald

4、isplay(LCD)thepaperdesignedaserialtypeLCDbasedonembeddedsystemwhichhasthefollowingadvantages:candisplaythegraphicscurvesshowclearpicturessuppttheRS232USBhighspeedcommunicationprotocol.Itwillplayanimptantpartintheindustri

5、alcontrolfieldswhichneedtheserialtypecleardisplaydevices.TheserialtypeLCDsystemismainlyconsistsofthefollowingfiveparts:centralprocessingunitdisplayunitpowerunitcommunicationunitmiscellaneousfunctionunit.Thecentralprocess

6、ingunitusestheFREESCALECompanyi.mx233microcontrollerwhichisbasedonARM9architectures.MeanwhiletakeDDR1SDRAMNFlashwith64MBmemycapacityasexternalmemywhichisusedtosavethedataofstartupcodesysteminfmationsoon.Thedisplayunituse

7、stheTFTLCD(ThinFilmTransistLCD)whichhastheadvantagesofsmallsize(3.5inch)highresolution(320240).TheLCDunitisdirectlycontrolledbytheinternalLCDcontrollerofthei.mx233.Thepowerunitisdesignedbythelowvoltage(LiIonBattery4.2V)w

8、hichcanrealizethelowpowerconsumption(1.2W)ofthedevice.ThecommunicationunitisconfiguredtothesimpleRS232interfaceprotocoltheUSBvirtualserialpt.TheinfmationwhichtransmittedbytheserialptcanbeclearlydisplayedbytheLCD.Themisce