Advanced_C,Freescale S12 Family 高级C编程技巧.pdf

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1、AdvancedCprogrammingfortheS12FamilyShanghaiAutoLab10April,2008TMFreescale™andtheFreescalelogoaretrademarksofFreescaleSemiconductor,Inc.Allotherproductorservicenamesarethepropertyoftheirrespectiveowners.©FreescaleSemiconductor,Inc.2006.1IntroductionWhatisthistrainingabout?TMA

2、gendaLinkerParameterFileRemapingmemoryresourcesUnderstandingmemoryarchitectureMapFileMemorymodelsOptimizingcallingconventionsbyhandRunningroutinesinRAMRunningroutinesfromtheStackMixingCandAssemblycodeCodeexamplesMoreStackfunLinkinglibraries.Freescale™andtheFreescalelogoaretr

3、ademarksofFreescaleSemiconductor,Inc.AllotherproductorservicenamesareTMthepropertyoftheirrespectiveowners.©FreescaleSemiconductor,Inc.2006.3LinkerParameterFile(PRM)BasicnotionsandbeyondTMLinkerParameterFileBasicsInthischapterwewillsee:HowthememorymapisreflectedinthePRMfilesy

4、ntaxSEGMENTSblockPLACEMENTblockHowtoputcodeordatainaparticularmemorylocation(reminder)Useof#pragmastatementsWhatareandHowtouseLinkerdefinedobjectsinyourcode__SEG_END__SEG_START__SEG_SIZEHowtoForcethelinkingofunusedvariablesUseofENTRIESblockFreescale™andtheFreescalelogoaretra

5、demarksofFreescaleSemiconductor,Inc.AllotherproductorservicenamesareTMthepropertyoftheirrespectiveowners.©FreescaleSemiconductor,Inc.2006.5DefaultMemorymapreflectedindefaultPRMfilesyntaxFreescale™andtheFreescalelogoaretrademarksofFreescaleSemiconductor,Inc.Allotherproductors

6、ervicenamesareTMthepropertyoftheirrespectiveowners.©FreescaleSemiconductor,Inc.2006.6Wherewillmycodego?Placementofcodeinmemory(reminder)PlacementblocksareallocatedintoSegmentblocksintheordertheyarelisted.•Inthisexample,Startupcode,StartupdataandConstantsgointoROM_C000•Applic

7、ationcodegoesintoPAGE_20andbeyond.•Auser-definedsectioncalledMyCodeisputatPage_30•ThestackisallocatedatthebeginningofRAMandmeasuresSTACKSIZEbytes•AllotherRAMstartswherestackendsFreescale™andtheFreescalelogoaretrademarksofFreescaleSemiconductor,Inc.Allotherproductorservicenam

8、esareTMthepropertyoftheirrespectiveowners.©FreescaleSemiconductor,Inc.2006.