用一块Arduino给另一块Arduino烧写bootloader.docx

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1、UsinganArduinoasanAVRISP(In-SystemProgrammer)ThistutorialexplainshowtouseanArduinoboardasanAVRISP(in-systemprogrammer).ThisallowsyoutousetheboardtoburnthebootloaderontoanAVR(e.g.theATmega168orATmega328usedinArduino).Thecodeinthisexampleisbasedonthemega-ispfirmwarebyRan

2、dallBohn.InstructionsTouseyourArduinoboardtoburnabootloaderontoanAVR,youneedtofollowafewsimplesteps.1.OpentheArduinoISPfirmware(inExamples)toyourArduinoboard.2.NoteforArduino1.0:youneedtomakeonesmallchangetotheArduinoISPcode.Findthelineintheheartbeat()functionthatsays"

3、delay(40);"andchangeitto"delay(20);".3.SelecttheitemsintheTools>BoardandSerialPortmenusthatcorrespondtotheboardyouareusingastheprogrammer(nottheboardbeingprogrammed).4.UploadtheArduinoISPsketch.5.WireyourArduinoboardtothetargetasshowninthediagrambelow.(NotefortheArduin

4、oUno:you'llneedtoadda10uFcapacitorbetweenresetandground.)6.SelecttheitemintheTools>Boardmenuthatcorrespondstotheboardonwhichyouwanttoburnthebootloader(nottheboardthatyou'reusingastheprogrammer).Seetheboarddescriptionsontheenvironmentpagefordetails.7.SelecttheArduinoasI

5、SPintheTools>Programmermenu.8.UsetheBurnBootloadercommand.NoteThisprocedureworkswiththeboardsthathavetheSPIsignalsontheindicatedpins.Forboardsforwhichthisisn'tvalid(32u4boardslikeLeonardo)theSPIsignalshavetobeconnectedtotheISPconnectorwhosepinoutisreportedbelow.Circuit

6、(targetingArduinoUno,Duemilanove,orDiecimila)AnArduinoboardservingasanISPtoprogramtheATmegaonanotherArduinoboard.OntheArduinoUno,you'llneedtoconnecta10uFcapacitorbetweenresetandground(afteruploadingtheArduinoISPsketch).Notethatyouneedaccesstotheresetpinonthetargetboard

7、,whichisn'tavailableonNGorolderboards.Circuit(targetingArduinoNGorolder)OnNGorolderboards,connecttheresetwiretopin1oftheAtmegachipontheboard,asshownabove.Circuit(targetinganAVRonabreadboard)SeetheArduinotoBreadboardtutorialfordetails.UsinganArduinoboardtoprogramanATmeg

8、a.Becausenoexternalclocksourceisconnected,theATmegamustbeconfiguredtouseitsinternalclock.UsinganArduinoboardtoprogram