PiCAN2 DUO SMPS USER GUIDE - copperhilltech.com

PiCAN2 DUO SMPS Rev D V1.4

SK Pang Electronics Ltd Ó 2021 www.skpang.co.uk

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Product name PiCAN2 DUO 3A SMPS CAN-Bus Board for Raspberry Pi

Model number RSP-PICAN2DUOSMPS

Manufacturer SK Pang Electronics Ltd

PiCAN2 DUO SMPS USER GUIDE

V1.4



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Contents

Table of Contents

1. Introduction ........................................................................................................... 31.1. Features.............................................................................................................................................................31.2. HardwareInstallation.................................................................................................................................31.3. ScrewTerminal..............................................................................................................................................41.4. 120WTerminator..........................................................................................................................................41.5. LED.......................................................................................................................................................................41.6. NotFittedItems.............................................................................................................................................42. Software Installation .............................................................................................. 41.7. BringUptheInterface.................................................................................................................................61.8. InstallingCANUtils.......................................................................................................................................63. Writing Your Own Software .................................................................................... 71.9. ApplicationinPython..................................................................................................................................71.10. ApplicationinC..............................................................................................................................................8



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1. Introduction ThisPiCAN2DUOboardprovidetwoindependentCAN-BuschannelsfortheRaspberryPi4.ItusestheMicrochipMCP2515CANcontrollerwithMCP2551CANtransceiver.Connectionsaremadeviaplugin4wayscrewterminal.Thisboardhasa5v3ASMPSthatcanpowerthePiiswellviathescrewterminal.

EasytoinstallSocketCANdriver.ProgrammingcanbedoneinCorPython.

1.1. Features • CANv2.0Bat1Mb/s• HighspeedSPIInterface(10MHz)• Standardandextendeddataandremoteframes• CANconnectionviascrewterminal• 120Ωterminatorready• SerialLCDready• LEDindicator• Fourfixingholes,complywithPiHatstandard• SocketCANdriver,appearsascan0andcan1toapplication• InterruptRXonGPIO25andGPIO24• 5v3ASMPStopowerRaspberryPiandaccessoriesfromscrewterminal

o Reversepolarityprotectiono Highefficiencyswitchmodedesigno 7vto24vinputrange

1.2. Hardware Installation BeforeinstallingtheboardmakesuretheRaspberryisswitchedoff.Carefullyalignthe40wayconnectorontopofthePi.Usespacerandscrew(optionalitems)tosecuretheboard.



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1.3. Screw Terminal TheCANconnectioncanalsobemadeviathe4wayscrewterminal.

ConnectorJ3pin4istheinputfortheSMPS,ithasaninputvoltagerangeof6vto20vthatisusedtopowertheRaspberryPi.

1.4. 120W Terminator Thereisa120Wfittedtotheboard.Tousetheterminatorsoldera2wayheaderpintoJP1andJP2theninsertajumper.

1.5. LED TherearetworedLEDsfittedtotheboard.ThisisconnectedtoGPIO04andGPIO26.

1.6. Not Fitted Items JP5canbeusetopoweraserialLCDwithdataonTXDlinefromthePi.Thereisalso5vsupplyonJP5.

2. Software Installation ItisbesttostartwithabrandnewRaspbianimage.Downloadthelatestfrom:

https://www.raspberrypi.org/downloads/raspbian/

CANA(J3)Pinnumber Function1 CAN_L2 CAN_H3 GND4 +12vIn

CANB(J4)Pinnumber Function1 CAN_L2 CAN_H3 GND4 n/c



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Afterfirsttimebootup,doanupdateandupgradefirst.

sudo apt-get update

sudo apt-get upgrade

sudo reboot

Addtheoverlaysby:

sudo nano /boot/config.txt

Addthese4linestotheendoffile:

dtparam=spi=on

dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25

dtoverlay=mcp2515-can1,oscillator=16000000,interrupt=24

dtoverlay=spi-bcm2835-overlay

RebootPi:

sudo reboot



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1.7. Bring Up the Interface YoucannowbringtheCANinterfacesup:

sudo /sbin/ip link set can0 up type can bitrate 500000


1.8. Installing CAN Utils InstalltheCANutilsby:

sudo apt-get install can-utils

ConnectthePiCAN2DuotoyourCANnetworkviascrewterminal.

TosendaCANmessageoncan0(CANBJ4)use:

cansend can0 7DF#0201050000000000

ThiswillsendaCANIDof7DF.Data020105–coolanttemperaturerequest.

TosendaCANmessageoncan1(CANAJ3)use:

cansend can1 7DF#0201050000000000

ConnectthePiCANDuotoaCAN-busnetworkandmonitortrafficbyusingcommand:

candump can0

Youshouldseesomethinglikethis:



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3. Writing Your Own Software YoucanwriteyourownapplicationsoftwareineitherCorPython.

1.9. Application in Python DownloadthePython-CANfilesfrom:

https://github.com/hardbyte/python-can/releases/tag/3.2.0

UnzipandcopyovertothePi.

sudo python3 setup.py install

BringtheCANinterfaceupifitisnotalreadydone:


Nowstartpython3

python3

Tosentamessageouttypethefollowinglines:

import can

bus = can.interface.Bus(channel='can0', bustype='socketcan_native')

msg = can.Message(arbitration_id=0x7de,

data=[0, 25, 0, 1, 3, 1, 4, 1],

extended_id=False)

bus.send(msg)



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Toreceivedmessagesanddisplayonscreentype:

notifier = can.Notifier(bus, [can.Printer()])

1.10. Application in C BringtheCANinterfaceupifitisnotalreadydone:


Downloadthesourcecodeandexamplefilesbytypingthefollowinginthecommandprompt:

wget http://skpang.co.uk/dl/cantest.tar

Unpackthetarfileandchangeintodirectoryby:

tar xf cantest.tar cd linux-can-utils

Theexamplefileiscalledcantest.ctoeditthisfile,typethefollowinginthecommandprompt:

nano cantest.c

Line77istheCANmessagetobesentout.

unsigned char buff[] = "7DF#0201050000000000";

7DFisthemessageIDand0201050000000000isthedata.Changethedatatosuit.PressCTRL-Xtoexit.Tocompiletheprogramtype:

make

Checktherearenoerrors.Toruntheprogramtype:

./cantest

PiCAN2 DUO SMPS USER GUIDE - copperhilltech.com

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