嵌入式系统架构软体设计-德霖技術學院資訊工程系

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1、嵌入式系统架构软体设计嵌入式系統架構軟體設計---usingARMDay#3,#4,#5ModulesOutline課程介紹Day#3SimpleRISCAssemblyLanguageARMAssemblyLanguageARMDevelopmentSuite使用練習Day#4ArmInstructionsetImportantASMProgrammingSkillsARM/THUMB/CInterworkingDay#5ARMExceptionHandlerBuildARMROMImageUseNET-Start!ucLinuxBSP嵌入式系統產品設計流程概觀SteveFu

2、rber,ARMsystem-on-chipArchitecture,2nded.Seal,ARMarchitecturereferencemanual,2nded.ARMDevelopmentSuite-GettingStartedARMDevelopmentSuite-DeveloperGuideARMDevelopmentSuite-AssemblerGuidehttp://www.uclinux.org/2002嵌入式系統開發經驗BuildingpowerfulplatformwithWindowsCESoftwareEngineering,Apractitioner’

3、sApproach3rded.ProfessionalSymbianProgramming嵌入式系統架構軟體設計---usingARMModule#3-1:SimpleRISCAssemblyConceptRISC精简指令集vs.CISC复杂指令集HardwareinstructiondecodelogicPipelineexecutionSingle-cycleexecutionLargemicrocodeROMstodecodeinstructionAllowlittlepipelineManycyclestocompleterasingleinstructionAsmal

4、lerdiesizeAshorterdevelopmenttimeAhigherperformancePoorcodedensityMUO一個簡單的處理器硬體單元功能PCProgramCounterACCAccumulatorALUArithmeticlogicunitIRInstructionregisterMUO指令集與資料路徑指令Opcode功能LDAS0000ACC=mem[S]STOS0001mem[S]=ACCADDS0010ACC=ACC+mem[S]SUBS0011ACC=ACC-mem[S]JMPS0100PC=SJGES0101IfACC>=PC=SJNES

5、0110IfACC!=0PC=SSTP0111stop指令規則指令執行範例ADD0x16AACC:=ACC+mem[0x16A]運算範例Cfunction:Main(){C=A+B;}MUO機器指令LDA0x100ADD0x104STO0x108指令Opcode功能LDAS0000ACC=mem[S]STOS0001mem[S]=ACCADDS0010ACC=ACC+mem[S]SUBS0011ACC=ACC-mem[S]JMPS0100PC=SJGES0101IfACC>=PC=SJNES0110IfACC!=0PC=SSTP0111stop練習：MUO微處理器的運算0x00

6、0LDA0x1000x002SUB0x1040x004STO0x1000x006JNE0x0000x008STP請描述此段程式的動作，暫存器值的變化、與資料流。請用C語言來寫出這段程式碼。指令Opcode功能LDAS0000ACC=mem[S]STOS0001mem[S]=ACCADDS0010ACC=ACC+mem[S]SUBS0011ACC=ACC-mem[S]JMPS0100PC=SJGES0101IfACC>=PC=SJNES0110IfACC!=0PC=SSTP0111stop嵌入式系統架構軟體設計---usingARMModule#3-2:ARMAssemblyLa

7、nguageARM7TDMI資料流e.g.r3:=r4+(r4,,2)ADDr3,r4,r4,LSL#2AbusBbusARM的暫存器30general-purpose,32bitsregisters1ProgramCounter(PC)1CurrentProgramStatusRegister(CPSR)5SavedProgramStatusRegisters(SPSR)UsermodeFIQmodeirqmodeSVCmodeabortmodeundefinedmoder0r1r2r3r