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GettingStartedwithMPLABIDEv8.56andanIntroductiontotheMicrochipMCC18CCompiler

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CoventryUniversityECAEE

GettingStartedwithMPLABIDEv8.56andanIntroduction

totheMicrochipMCC18CCompiler

TableofContents1 MPLAB IDEv8.56andMicrochipMCC18CCompiler..............................................................................................2

1.1 BuildingProjects...............................................................................................................................................2

1.2 Simulation.........................................................................................................................................................7

2 DownloadingtheProgramtotheBoardusingMPLABICD3...................................................................................8

3

DigitalIO

....................................................................................................................................................................

8

3.1 HardwareApparatus.........................................................................................................................................8

3.2 CCodeListing..................................................................................................................................................10

4 ADC..........................................................................................................................................................................10

4.1 HardwareApparatus.......................................................................................................................................10

4.2 CCodeListing..................................................................................................................................................12


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1 MPLABIDEv8.56andMicrochipMCC18CCompiler1.1 BuildingProjectsThissectionwillguideyoustepbystepthroughbuildingaprojectinMPLABIDE.

OpenMPLABIDEv8.56

byusingthedesktopshortcuticonorthroughStart>

Programs>Microchip>MPLABIDEv8.56>MPLAB

IDE.exe

Beginanewprojectbyusingthenewprojectwizard

Menu>Project>ProjectWizard

ClickNext

SelectPIC18F4520

ClickNext

SelectMicrochipC18toolsuitefromthedropdownlist

(sothisprojectisexpectingCcodeandnotassembly)

Ifredcrossesappearthetoolsuiteneedstobefound

manually.

ItshouldbelocatedontheApps(driveD:/MCC18/)

Browseforeachpartofthetoolsuiteandselectthe

correctlocationsbeforecontinuing

ClickNext


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Findadirectorytouseasaworkspace(alocationto

saveourprojectfiles)andgivetheprojectaname

ClickNext

Thisisforaddingexistingfileswhichwehavenoneso

leaveblank

ClickNext

ClickFinish

NowweshouldseeourprojectstructureintheProject

viewwindow

Menu>File>New

Thiswillbeourmain.cfilewhichwillcontainourmain

method.


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Menu>File>SaveAs

Nameitmain.candclicksave

Nowweneedtoaddthemain.cfileintoourproject

IntheProjectviewwindowRightClickSourceFiles>

AddFiles

Select

our

newly

created

main.c

file

ClickOpen

Ourmain.c

file

is

added

to

our

project

window

under

SourceFiles

Writeashortprogram

Afull

code

listing

can

be

found

in

Appendix

ADC

code

atthebackofthishandout


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Nextweneedtoaddthelinkerscript

IntheProjectviewwindowRightClickLinkerScript>

AddFiles

ItshouldbelocatedontheAppsdrive(D:/MCC18/)

Select18f4520.lkr

ClickOpen

Noticethelinkerfileshasbeenaddedtoourproject

Nextweneedtoviewthebuildoptions

Menu>Project>BuildOptions>Project

NowwearepresentedwiththeBuildoptionsscreen.

Thisiswherewecansetsearchpathsforourproject.

Checkeachofthefollowingdropdownsandmakesure

wehaveapathlistedsimilartotheexamplesbelow.

WecanaddnewpathsbyclickingNew>and

browsingforafolder

OutputDirectory:

F:\MPLABWorkspace\Output

IncludeSearchPath:

D:\MCC18\h

LibrarySearchPath:

D:\MCC18\lib

LinkerScriptSearchPath:

D:\MCC18\lkr

ClickOK


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Withallthesearchpathssetupcorrectlywecan

compileourfile

Menu>Project>BuildAll

TheOutputwindowshoulddisplayBUILDSUCCEEDED


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1.2 SimulationThissectionwillguideyoustepbystepthroughsimulatingaprojectinMPLABIDE.

Withabuiltprojectsimulationcanbeperformed

Menu>Debugger>SelectTool>MPLABSIM

Wecanwatchwhatishappeningtovariablesinour

programtocheckiftheyarechangingasexpected

Menu>View>Watch

SelectTRISA

from

the

drop

down

SelectAddSFR(SpecialFunctionRegister)toadditto

thewatchwindow

DothesameforTRISBandTRISD

Breakpointscanbeusedtopausetheprogramatkey

pointsandareusefulwhenusedinconjunctionwith

thewatchwindowtochecklinesofcodeareoperating

asweexpectthemto

Beforestarting

the

simulation

add

three

breakpoints

in

ourprogramwherewesetTRISA,TRISBandTRISDby

doubleclickinginthelefthandgreymargin

Thecommands

in

the

debugger

toolbar

come

in

useful

whensimulatinganddebugging

SelectRuntobeginrunningtheprogramindebug

mode

Whenthefirstbreakpointisreachedtheprogramwill

pause

Thenextlinetobeprocessedisshownbythegreen

arrowinthemargin

Byusingthedebugcommandsstepthroughthe

programandkeepandeyeonthewatchwindowto

checkifthevariablevaluesupdateasexpected


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2 DownloadingtheProgramtotheBoardusingMPLABICD3

Menu>Programmer>SelectProgrammer>MPLABICD

3

RemoveanyIOportconnectionstothePICboardbefore

programmingtheboard

PlugintheICDUSBtoPCandthecabletothe

developmentboard

TargetDetected

VoltageCautionWindow

SelectOK

Programmingcomplete

YoucanplugbackintheIOconnectionstothePIC

developmentboardandcheckfunctionality

Whenreprogrammingtheboardbesuretoremovethe

IOport

connections

beforehand.

3 DigitalIOThistutorialaimstoguideyouthroughtheDigitalIOdevelopmentforthePIC18toreaddigitalinputanddisplay

digitaloutput.

3.1

HardwareApparatus

PCwithMPLABandUSBport

ICD3,USBleadandconnectingcable

5voltfixedPSUandconnectingleads

PIC18F4520developmenttargetboard

PIC18IOprototypingboardandconnectingcableforPortDoutput

AdditionalportIOboardforPortBinputsandconnectingcableforPortBinput

8bitdigitaloutput(10LEDbargraphdisplay(weonlyusethefirst8bitsinthisexample))

8bitdigitalinput(8bitswitchnetwork)

Resistornetwork(toactaspullupresistors)


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3.2 CCodeListing

//DigitalIO.c

//8bitinputofPortDareoutputtoPortB

#pragmaconfigOSC=HS//setOSCmodetoHS

#pragmaconfigWDT=OFF//setwatchdogtimeroff

#pragmaconfigLVP=OFF//lowvoltageprogrammingoff

#pragmaconfigDEBUG=OFF//compilewithoutextradebugcompilecode

#include//deviceusedisthePIC18F4520

voidmain(void)

{

LATB=0x00;//initlatchportB

LATD=0x00;

//

init

latch

port

D

TRISB=0x00;//configportBasoutput

TRISD=0xFF;//configportDasinput

while(1)//loopforever

{

PORTB=PORTD;//passtheportDinputtoPortB

}//while

}//main

4 ADCThistutorialaimstoguideyouthroughtheADCinputdevelopmentforthePIC18toreadanalogueinputanddisplay

digitaloutput.

4.1 HardwareApparatusPCwithMPLABandUSBport

ICD

3,

USB

lead

and

connecting

cable

5voltfixedPSUandconnectingleads

PIC18F4520developmenttargetboard

PIC18IOprototypingboardandconnectingleadforPort

Doutput

ADCpotentiometersboardandconnectingcable

10LEDbargraphdisplay(weonlyusethefirst8bitsin

thisexample)

2x270Rresistors


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4.2 CCodeListing

//ADCInterface.c

//ADCInterfacingexamplefor10bitADC

//ThefollowingexampleshowstheprocedureofsettingupandusingthePICADC

//PICADCCh0isusedastheanalogueinput.All10bitsareshownonPortsD(08)andPortB(bits9and10)

#pragmaconfigOSC=HS//setoscmodetoHS

#pragmaconfigWDT=OFF//setwatchdogtimeroff

#pragmaconfigLVP=OFF//LowVoltageProgrammingOff

#pragmaconfigDEBUG=OFF//CompilewithoutextraDebugcompileCode

#include//DeviceusedisthePICF452

#include

#include

#include

voidmain(void)

{

//SetPORTBasDigitalOutputstodisplayonlythe8LSBADCvalues

TRISB=0x00;//ConfigurePortBasO/P

TRISA=0xFF;//ConfigurePortAasI/PsforADC

TRISD=0X00;//ConfigurePortDasallO/P

//ConfiguretheADC

//ThefollowingconfiguretheADCmoduleoperationalmode

//OpenADCconfigurestheoperationoftheADCwithanumberofarguments

//ADC_FOSCselectstheADCclocksourceandhasanumberofsetvalues

//ADC_RIGHT_JUST selectADCresultjustification

//ADC_0_TAD

sets

the

A/D

acquisition

time

select

//ADC_CH0selectChannel0

//ADC_INT_OFFInterruptsaredisabled

//ADC_VREFPLUS_VDD setADC+referencevoltageconfigurationtoVDD

//ADC_VREFMINUS_VSS setADC referencevoltageconfigurationtoVSS

//0b1011aretheA/DcontrolRegister1configbitssettingthereferenceandfunctionofportbits

OpenADC(ADC_FOSC_32&ADC_RIGHT_JUST &ADC_20_TAD,ADC_CH0 &ADC_INT_OFF&ADC_VREFPLUS_VDD &

ADC_VREFMINUS_VSS, 0b1011);

SetChanADC(ADC_CH0);//Selectsthepinusedasi/ptothe

while(1)

{

ConvertADC();//startA/Dconversion

while(BusyADC( ));//waitforcompletion

//GetresultsandstoreatPortsD&B

LATD=ADRESL;//ResultsRegisterLowdisplayed,leastsignonPortD

LATB=ADRESH;//ResultsRegisterHighdisplayedonPortB

CloseADC();

}//while

}//

main

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