generate 1khz pwm using tms320f2812

7/2/2015 Generate1KhzPWMUsingTMS320F2812DSP

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Generate1KhzPWMUsingTMS320F2812DSPGenerate1KhzPWMusingTMS320F2812DSP

Tags:1KHZPWMGENERATIONUSINGTMS320F2812,PROGRAMTOGENERATEPWMUSINGTMS320F2812,TMS320F2812SOURCECODEFORPWM,,DownloadSourcecode

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GENERATE1KhzPWMUSINGTMS320F2812DSP

Aim

ToGeneratethe1KhzPWMinTMS320F2812KIT.

Requirements

CCSv3.3TMS320F2812KITUSBCable

5VAdapter

Theory

PulseWidthModulation(PWM),isacommonlyusedtechniqueforcontrollingpowertoinertialelectricaldevices,madepracticalbymodernelectronicpowerswitches.

InTMS320F2812kit,TheF2812processorcorehaveanEventManagertogeneratethePWMs.TheCorehasa2Eventmanager,EVA&EVB.UptoeightPWMwaveforms(outputs)canbegeneratedsimultaneouslybyeacheventmanager.So,totally16PWMsgetatF2812processorWhichismorethanenoughtocontrolafivephasedevicecontrol.EVhavecertainRegisterstoperform.

TherearetwoGPtimersineachEVmodule.TheGPtimerx(x=1or2forEVA,x=3or4forEVB)includes

A16bittimer,up/downcounter,TxCNT,forreadsorwritesA16bittimercompareregister,TxCMPR(doublebufferedwithshadowregister),forreadsorwritesA16bittimerperiodregister,TxPR(doublebufferedwithshadowregister),forreadsorwritesA16bittimercontrolregister,TxCON,forreadsorwrites

Thesefourregistersareveryimportantandneededtogeneratethepwm.,somemoreregister(GPTCONA,DBTCONA,COMCONA,ACTRA,CMPR1,CMPR2,CMPR3,CAPCONA)areavailabletoControlthePWM.

Calculatingtheperiodvaluefor1Khzpwm



Where,

SYSCLKOUT=125Mhz

HISPCP2

TPS1(LoadtheTPSValueinT1conregister).

TIPWM1000(1khZ).

T1PR=F424for1Khzperiodvalue.

T1CMPR=7A12.(50%DutyCycle)

Procedure

Note:OnceyouinstalltheCodeComposerStudiov3.3software,thetwoiconswilldisplayindesktop

SetupCodeComposerStudiov3.3CodeComposerStudio

1.OpenSetupCodeComposerStudiov3.3.

2.InSystemConfiguration,selecttheboardthenRemoveallyes.

Infamily,selectC28xx.Inplatform,selectxds100usbemulator.InEndianness,selectlittle.SelectF2812XDS100USBEmulatoraddsave&quitno.

Note:TheabovetwostepsonlyforfirsttimetosetuptheprocessorinCCS.

3.OpenCodeComposerStudiov3.3.

4.ProjectNew.

Projectname:typetheprojectname.



Location:Browse,selecttheprojectlocation.ProjectType:Executable(.out)Target:TMS320C28XX.Finish.

5.FileNewSourcefile.

Typetheprograminuntitledwindow.

6.FileSave.

Browseourprojectlocationthentypeourprojectname.c(.cextensionismust)save.

7.Pastethefollowingtwocmdfilesinourprojectfolder.

F2812_EzDSP_RAM_lnk.cmdDSP281x_Headers_nonBIOS.cmdDSP281x_GlobalVariableDefs.c

8.ProjectAddfilestoproject.

Infileoftype:AllfilesCtrl+Selectthefollowingfilesprojectname.cDSP281x_GlobalVariableDefs.cF2812_EzDSP_RAM_lnk.cmdDSP281x_Headers_nonBIOS.cmdopen.

9.ProjectBuildOption.

Incompilertab,selectPreprocessor

Includesearchpath(i):C:\tidcs\c28\DSP281x\v120\DSP281x_headers\include

Inlinkertab,selectlibraries

Searchpath(i):C:\CCStudio_v3.3\C2000\cgtools\libIncllibraries(l):rts2800_ml.lib.

Inlinkertab,selectBasic



StackSize(stack):0x400ok.

10.ProjectBuild(or)Rebuildall.

11.ConnectionsforTMS320F2812KIT

Connect5vadptertoTMS320F2812kit.ConnectusbcabletoTMS320F2812kitfrompc.PowerontheTMS320F2812kit.

12.Debugconnect.

13.FileLoadProgramBrowseandselecttheprojectname.outfileopen

14.DebugGomain.

15.DebugRun.

16.SeetheoutputatCRObyconnectingprobepositiveterminalto(PortA)PWMpins&probenegativeterminaltoGround.

17.DebugHalt.

Program

#include"DSP281x_Device.h"//DSP281xHeaderfileIncludeFile#include"DSP281x_Examples.h"//DSP281xExamplesIncludeFile//Prototypestatementsforfunctionsfoundwithinthisfile.voidInitSystem(void)voidmain(void){InitSystem()EALLOWGpioMuxRegs.GPAMUX.all=0x01FF//EVAPWM16pinsGpioMuxRegs.GPBMUX.all=0x00FF//EVBPWM712pinsEDISDINTEvaRegs.T1PR=0xF424//Timer1periodEvaRegs.T1CMPR=0x7A12//Timer1compareEvaRegs.T1CNT=0x0000//Timer1counterEvaRegs.T1CON.all=0x1042//TMODE=continuousup&Timer



enableEvaRegs.T2PR=0xF424//Timer2periodEvaRegs.T2CMPR=0x7A12//Timer2compareEvaRegs.T2CNT=0x0000//Timer2counterEvaRegs.T2CON.all=0x1042EvaRegs.GPTCONA.bit.TCMPOE=1//DriveT1/T2PWMbycomparelogicEvaRegs.GPTCONA.bit.T1PIN=1//PolarityofGPTimer1Compare=ActivelowEvaRegs.GPTCONA.bit.T2PIN=2//PolarityofGPTimer2Compare=ActivehighEvaRegs.CMPR1=0x7A12//EnablecompareforPWM1PWM6EvaRegs.CMPR2=0x7A12EvaRegs.CMPR3=0x7A12EvaRegs.ACTRA.all=0x0666EvaRegs.DBTCONA.all=0x0530//DisabledeadbandEvaRegs.COMCONA.all=0xA600EvaRegs.CAPCONA.bit.CAPRES=0//resetallcaptureregstozeroEvaRegs.CAPCONA.all=0x2240//enableCAP1,selctinggptimer1&detectingrisingedgeEvaRegs.CAPFIFOA.all=0x0100for()}voidInitSystem(void){EALLOWSysCtrlRegs.WDCR=0x0068//Setupthewatchdog//0x00E8todisabletheWatchdog,Prescaler=1//0x00AFtoNOTdisabletheWatchdog,Prescaler=64SysCtrlRegs.SCSR=0//WatchdoggeneratesaRESETSysCtrlRegs.PLLCR.bit.DIV=10//SetuptheClockPLLtomultiplyby5SysCtrlRegs.HISPCP.all=0x1//SetupHighspeedClockPrescalertodivideby2SysCtrlRegs.LOSPCP.all=0x2//SetupLowspeedCLockPrescalertodivideby4//Peripheralclockenablessetfortheselectedperipherals.SysCtrlRegs.PCLKCR.bit.EVAENCLK=1SysCtrlRegs.PCLKCR.bit.EVBENCLK=0SysCtrlRegs.PCLKCR.bit.SCIAENCLK=0SysCtrlRegs.PCLKCR.bit.SCIBENCLK=0SysCtrlRegs.PCLKCR.bit.MCBSPENCLK=0SysCtrlRegs.PCLKCR.bit.SPIENCLK=0SysCtrlRegs.PCLKCR.bit.ECANENCLK=0SysCtrlRegs.PCLKCR.bit.ADCENCLK=0EDIS}



Result

Thus,the1KhzPWMwasgeneratedusingTMS320F2812Kit.

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generate 1khz pwm using tms320f2812

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