CHIPKIT PI - CHIPKIT - Datasheet.Directory

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Overview:chipKITPi

Introduction

chipKIT™Pi(DesignedforRaspberryPi)isthelatestArduino™compatiblechipKIT™platformfrom

Microchipandelement14.Itfeaturesa32‐bitPIC32microcontrollerinaprototyping‐friendly,low

pincountSPDIPpackage.ThePIC32'sperformance,memoryandintegratedperipheralsallowusers

tocreateapplicationsincludingtouchsensing,audioprocessingandadvancedcontrol.Theboardis

supportedbythefreechipKIT™Multi‐PlatformIDE(MPIDE)thatcanbehostedontheRaspberryPi.

GettingfamiliarwithchipKIT™Pi

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1BootloaderEnableButton

2RESETButton

3JA4:PowerHeader

4JA3:Analog/DigitalHeader

5JTAGConnector

6LEDs

7JA2:Digital/SerialHeader

8JA1:Digital/SerialHeader

9RaspberryPiBreakoutHeader

10RaspberryPiConnectionHeader(undersideofboard)

11USBConnection

12ICSPConnection(notpopulated)

13PowerConnector

14PIC32MX250F128BMicrocontroller

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chipKITPiJumperSettings

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JumperFunctionDescription

 Jumperacrosspins1and2Jumperacrosspins2and3

JP2InputVoltageSelection

(Ifyouareunclearastothe

functionofthisjumper

leaveinthedefaultright‐

mostposition.Potentialfor

Microcontroller(MCU)

damageifconfigured

incorrectly)

Twoleft‐mostpinsbypasses

voltageregulator

Right‐mostpinsconnectsinput

voltageto5Vregulator

JP1FunctionSelectUART2Receive(RX2)

(positionrequiredtoprogram

chipKITPiviaMPIDEoverserial)

ICSPFunctionPGEC

JP4FunctionSelectUART2Transmit(TX2)

(positionrequiredtoprogram

chipKITPiviaMPIDEoverserial)

ICSPFunctionPGED

JP8FunctionSelectSPIconnectorMISOonJA1 JTAGFunctionTCK

JP14FunctionSelectSPIconnectorSSonJA1 JTAGFunctionTDI

JP6FunctionSelectBootloadButtonEnableJTAGFunctionTDO

JP11FunctionSelectBoardLED2 A1onJA3

JP15FunctionSelectBoardLED1 A0onJA3

JP12FunctionSelectUSBfunctionD‐

JP13FunctionSelectUSBfunctionD+

JP7FunctionSelectUART1Transmit(TX1) ConnecttoSOSCIforX2

Oscillator

JP9FunctionSelectUART1Receive(RX1) ConnecttoSOSCOforX2

Oscillator

JP10FunctionSelectJTAGfunctionTMS

JP55VConnectionConnectto5VsupplyoffofPi PowerchipKITPifromexternal

supply

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chipKITPiPinOutMap

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PIC32MX250F128BPin

(Pinsare3.3VTolerant

onlyunlessotherwise

noted)

chipKITPiPinFunctionNotes

1(5VTolerant)RESETConnectedtoRESETPushbutton

214/A0ConnectedtoLED1

311

45/TX2ConnectedtoUARTonRaspberryPi

54/RX2ConnectedtoUARTonRaspberryPi

616/A4/SDA2ConnectedtoSDAonJA3header

717/A5/SCL2ConnectedtoSCLonJA3header

8VSS Notavailable

99Usedfor8MHzOscillator

1010Usedfor8MHzOscillator

1111/TX1ConnectedtoTX1LEDandcanbeused

with32.768kHzoscillator

1212/RX1ConnectedtoRX1LEDandcanbeused

with32.768kHzoscillator

13VDDNotavailable

14(5VTolerant)2

15(5VTolerant)VBUSNotavailable

16(5VTolerant)10

17(5VTolerant)12/SCL1

18(5VTolerant)18/SDA1/INTConnectedtoBOOTLOAD‐ENbutton

19VSSNotavailable

20VCAPNotavailable

218ConnectedtoD‐

229ConnectedtoD+

23VUSB3V3Notavailable

243

2513

2615/A1ConnectedtoLED1

27AVSSNotavailable

28AVDDNotavailable

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GettingupandrunningwithchipKIT™Pi

chipKIT™PireliesontheopensourceMPIDEintegrateddevelopmentenvironment,aversionof

whichhasbeenportedtoanoperatingsystemthatrunsonRaspberryPi.

Itisrecommended,foreaseandforfirsttimeuse,thatusersdownloadthecompleteoperating

systemandMPIDEasacompletepackage.Thiscanbedownloadedat

http://downloads.element14.com/downloads/chipkit_pi.zip,andshouldbesavedtoyourcomputer.

Thefilewillbequitelarge(2GB),andwillrequireunzippingonceithasbeendownloaded.Once

unzipped,youwillbeleftwitha.ISOimagefile,readyforflashingtoyouremptySDCard.

ChooseanSDCardofatleast4GBcapacity.UseaflashingutilitylikeWin32DiskImager(available

forfree,fromhttp://sourceforge.net/projects/win32diskimager/)toflashthe.ISOimagetoyourSD

Card.Whencomplete,insertthefullyflashedSDCardtoyourRaspberryPi.

PlugyournewchipKIT™PiboardintoRaspberryPi,andpowerup.AsMPIDEisalreadyinstalled,you

shouldbeabletostartMPIDEfromthedesktop.Forreliableoperation,donotplugchipKIT™Piinto

aRaspberryPithatisalreadypoweredup.Alwayspowerupbothdevicestogether.

PoweringthechipKIT™Pi

ThechipKITPicanbepoweredinthefollowingways:

‐ OvertheUSB

‐ ViatheICSPConnection

‐ ThroughtheVininput

‐ FromtheRaspberryPi

‐ Throughthepowerjack

ProgrammingthechipKITPifromMPIDE

InordertoprogramthechipKITPifromMPIDEwithyoursketch,theboardmustbesetto

bootloadermode.Toenterbootloadermode:

1. EnsurethatbothJumpersJP1andJP4areconnectedtoupper‐mostpinsoftheirheader

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2. PressandholdtheBOOTLOAD‐ENbutton.

3. WhiletheBOOTLOAD‐ENbuttonisstillpressed,pressandreleasetheRESETbutton.

4. ReleasetheBOOTLOAD‐ENbutton.

5. BootloadermodewillbeconfirmedwhentheTX1LEDisonandtheRX1flashes.

6. Afterthesketchisuploaded,theTX1andRX1LEDswillturnoff.

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ExampleSketches

SketchesareArduino™styleprogrammesthatallowyoutosimplycontrolvariousaspectsofthe

chipKITPi’sprocessor,peripheralsandGPIO.SomeexamplesarebuiltintotheMPIDEsoftware.The

bestwaytolearnistoselectone,loaditanduploaditintothechipKIT™Pi.

Schematic

Fortheschematicinformation,pleasevisittheelement14community

http://www.element14.com/chipkit_pi

MoreInformation

Formoreinformation,pleasevisit

1. Theelement14communityhttp://www.element14.com/chipkit_pi

2. Theknode,element14

http://www.element14.com/community/community/knode/dev_platforms_kits/element14

_dev_kits/microchip‐chipkit/chipkit_pi

3. chipKITwebsitehttp://chipkit.net/

4. chipKITforumhttp://www.chipkit.org/forum/index.php

5. PIC32MX250F128BHomepage

http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en557425

6. TCHIP‐USB‐MX250F128B(PIC32MX250F128Bpre‐programmedwithUSBbootloader)

http://www.microchipdirect.com/productsearch.aspx?keywords=TCHIP‐USB‐MX250F128B

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ThechipKITPicanalsobeusedasastandalonechipKITboard.AversionofthePIC32MX250F128B

microcontrollerisavailablepreprogrammedwithaUSBbootloaderthatcanbeusedtoreplacethe

PIC32withUARTbootloaderthatcomeswiththechipKITPi.Inthisway,theuserwouldsimply

connectthechipKITPiviatheUSBconnectiontotheirpersonalcomputer’sUSBportandusethe

MPIDEversionfortheiroperatingsystem.ForinstructiononhowtodownloadtheMPIDE,see