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1、定时器PWM输出实验1.实验目的1）熟悉Linux开发环境。2）掌握S5PV210内部相关寄存器的操作方法，最终实现对外部设备的控制。3）熟悉在Linux裸机环境下的C语言编程。4）熟悉S5PV210的定时器编程。2实验内容学习并编程实现ARM的定时器PWM输出。3实验设备1）硬件：S5PV210教学实验箱、PC机；2）软件：PC机操作系统Windows98（2000、XP）+VMwareworkstation+Ubuntul2开发环境。4基础知识S5PV210共有5个32bit的PWM定时器，其中定时器0、1、2、3有PWM功能，定时器4没有输出引脚。PWM定时器使用PCLK_
2、PSYS作为时钟源。PCLK1/11/21/41/81/16—>*SCLKPWM时钟初始化相关寄存器APLLCONOENABLEReservedLOCKEDReservedMDIVReservedPDIVReservedSDIVrv.”ControlLogicO{tcmpboIItcntbqJ―►十6:1—►MUX6:1WUXXpwmTQUTODoadzonoTTControlLoglclh2I—TCMPBli
3、tCNTBi1XpWlTOUTI1-2PWMTIMERClockTreeDiagramr—1/11/21/4W1/16―>麯—>8BTJPRESC/U.EFBitpij[
4、30]08:26]05:16][15:14][13:8][7：3][2:0]ControlLogic2PLLlockingindication0=Unlocked1=LockedReadOnlyReservedPLLMdividevalueReservedReservedPLLSdividetheinputclockfrequencyis24MHz.DescriptionPLLenablecontrol(0:disable,1:enable)ReservedPLLPdividevaluTheresetvalueofAPLL—CONOgenerates800MHzEquationt
5、ocalculatetheoutputfrequency:FOUT=MDIVXFIN/(PDIVx2s，1vely,iftheinputclockfrequencyis24TheresetvalueofMPLL_CONgenerates667MHzMHz.Equationtocalculatetheoutputfrequency:FOUT=MDIVXFIN/(PDIVX2SDIV)3.7.3.1ClockSourceControlRegisters(CLK_SRC0,R/W,Address=0xE010一0200}CLK一SRCOBitDescriptionInitialStat
6、eReserved[31:29]Reserved0x0ONENANDSEL[28]ControlMUXFLASH(0:HCLKPSYS,1:HCLKDSYS)r0Reserved07:25】Reserved0x0MUXPSYS一SEL[24】ControlMUXPSYS(0:SCLKMPLL,1:SCLKA2M)0Reserved[23:21]Reserved0x0MUXJ3SYS一SEL[20]ControlMUX_DSYS(0:SCLKMPLL,1:SCLKA2M)0Reserved[19:17]Reserved0x0MUX一MSYS一SEL[16]ControlMUX_MS
7、YS(0:SCLKAPLL,1:SCLKMPLL)0Reserved[15:13]Reserved0x0VPLL^SEL[12]ControlMUXVPLL(0:FINVPLL,1:FOUTVPLL)0Reserved[11：9]Reserved0x0EPLL一SEL[8]ControlMUXEPLL(0:FINPLL,1:FOUTEPLL)0Reserved[7：5]Reserved0x0MPLL^SEL[4]ControlMUXMPLL(0:FINPLL,1:FOUTMPLL)0Reserved[3：1]Reserved0x0APLL一SEL[0]ControlMUXAPLL
8、(0:FINPLL,1:FOUTAPLL)0定时器初始化相关定时器TimerI叩utClockFrequency=PCLK/({prescalervalue♦1})/{dividervalue}{prescalervalue}=1*255{dividervalue}=1,2,4,8,16.TCLKDeadzonelength=0*254TCFGOBitDescriptionInitialStateReserved[31:24]ReservedBits0x00Deadzonelen
