lec-into_to_prog_embedded_systems

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1、IntroductiontoProgrammingEmbeddedSystemsSebastianFischmeistersfischme@seas.upenn.eduDepartmentofComputerandInformationScienceUniversityofPennsylvania1GoalsRoughunderstandingoftheunderlyinghardware.Understandhowtodevelopsoftwareforthelabplatform.CSE480/CIS700S.Fischmeister21WhatisAnEmbeddedSy

2、stem?Ageneral-purposedefinitionofembeddedsystemsisthattheyaredevicesusedtocontrol,monitororassisttheoperationofequipment,machineryorplant.“Embedded”reflectsthefactthattheyareanintegralpartofthesystem.Inmanycases,their“embeddedness”maybesuchthattheirpresenceisfarfromobvioustothecasualobserver.I

3、nstituteofElectricalEngineers(IEE)CSE480/CIS700S.Fischmeister3ForUsPIC18F2680o3,328BRAMo64kBROMo1.024BEEPROMo5MIPS@20MHzoA/Dconverterso1xUARTo1x8bitTimero3x16bitTimerCSE480/CIS700S.Fischmeister42WilluseinthePICDEM2boardtoBlinkLEDsControlanLCDdisplayCommunicateviatheseriallinewithaPCCommun

4、icateviatheCANprotocolwithothermicrochipsDriveasteppermotorCSE480/CIS700S.Fischmeister5UseitfurthertoControlamodularrobot:CSE480/CIS700S.Fischmeister63TheHardware7AMicroprocessorIntroducedasaprogrammablereplacementforlogic-basedcircuitsinthe1970s.Advantagescomparedtologic-basedcircuits:oPr

5、ovidefunctionalupgrades(e.g.,addnewfeaturetomachinetoolafterdeployment)oProvideeasymaintenanceupgrades(e.g.,fixabuginthecellphoneviaanSMSfirmwareupgrade)oLessfragile(e.g.,insteadofhundredsdiscretelogicchipsandwiringonlyonemicroprocessor)oProtectionofintellectualproperty(itismoredifficulttocopy

6、softwareburntintheon-chipmemorythantocheckthepartnumbersandthewiring)CSE480/CIS700S.Fischmeister84WhatmakesaMicroprocessor?ProcessoroAnarithmeticlogicunit(ALU)forprocessing.MemoryoPermanentmemoryforkeepingtheprogram(=ROM)oVolatilememoryforcomputation(=RAM)oRewritablepermanentmemoryforlogging

7、,tuning,storingintermediatedata(=EEPROM)ConnectivitytoperipheralsoBinaryoutputsviasinglechippinsoIntegratedasynchronousandsynchronousserialinterfacessuchasUART,I2C,RS232,CANCSE480/CIS700S.Fischmeister9WhatmakesaMicroprocessor?TimersoE