SK Pang Electronics PiCAN2 DUO SMPS User manual

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!PiCAN2 DUO SMPS Rev D V1.4
!
SK Pang Electronics Ltd Ó 2021
www.skpang.co.uk
1
!
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

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!PiCAN2 DUO SMPS Rev D V1.4
!
SK Pang Electronics Ltd Ó 2021
www.skpang.co.uk
2
!
Contents
Table of Contents
1.!Introduction ........................................................................................................... 3!
1.1.!Features*.............................................................................................................................................................*3!
1.2.!Hardware*Installation*.................................................................................................................................*3!
1.3.!Screw*Terminal*..............................................................................................................................................*4!
1.4.!120W*Terminator*..........................................................................................................................................*4!
1.5.!LED*.......................................................................................................................................................................*4!
1.6.!Not*Fitted*Items*.............................................................................................................................................*4!
2.!Software Installation .............................................................................................. 4!
1.7.!Bring*Up*the*Interface*.................................................................................................................................*6!
1.8.!Installing*CAN*Utils*.......................................................................................................................................*6!
3.!Writing Your Own Software .................................................................................... 7!
1.9.!Application*in*Python*..................................................................................................................................*7!
1.10.!Application*in*C*..............................................................................................................................................*8!
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!PiCAN2 DUO SMPS Rev D V1.4
!
SK Pang Electronics Ltd Ó 2021
www.skpang.co.uk
3
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1. Introduction
This!PiCAN2DUO!board!provide!two!independent!CAN-Bus!channels!for!the!
Raspberry!Pi!4.!It!uses!the!Microchip!MCP2515!CAN!controller!with!MCP2551!CAN!
transceiver.!Connections!are!made!via!plug!in!4!way!screw!terminal.!This!board!has!a!
5v!3A!SMPS!that!can!power!the!Pi!is!well!via!the!screw!terminal.!
Easy!to!install!SocketCAN!driver.!Programming!can!be!done!in!C!or!Python.!
1.1. Features
•! CAN!v2.0B!at!1!Mb/s!
•! High!speed!SPI!Interface!(10!MHz)!
•! Standard!and!extended!data!and!remote!frames!
•! CAN!connection!via!screw!terminal!
•! 120Ω!terminator!ready!
•! Serial!LCD!ready!
•! LED!indicator!
•! Four!fixing!holes,!comply!with!Pi!Hat!standard!
•! SocketCAN!driver,!appears!as!can0!and!can1!to!application!
•! Interrupt!RX!on!GPIO25!and!GPIO24!
• 5v!3A!SMPS!to!power!Raspberry!Pi!and!accessories!from!screw!terminal!
o Reverse!polarity!protection!
o High!efficiency!switch!mode!design!!
o 7v!to!24v!input!range!
!
1.2. Hardware Installation
Before!installing!the!board!make!sure!the!Raspberry!is!switched!off.!Carefully!align!
the!40way!connector!on!top!of!the!Pi.!Use!spacer!and!screw!(optional!items)!to!secure!
the!board.!
!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!PiCAN2 DUO SMPS Rev D V1.4
!
SK Pang Electronics Ltd Ó 2021
www.skpang.co.uk
4
!
1.3. Screw Terminal
The!CAN!connection!can!also!be!made!via!the!4!way!screw!terminal.!
!
!
!
!
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!
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Connector!J3!pin!4!is!the!input!for!the!SMPS,!it!has!an!input!voltage!range!of!6v!to!20v!
that!is!used!to!power!the!Raspberry!Pi.
1.4. 120
W
Terminator
There!is!a!120W!fitted!to!the!board.!To!use!the!terminator!solder!a!2way!header!pin!to!
JP1!and!JP2!then!insert!a!jumper.!
!
1.5. LED
There!are!two!red!LEDs!fitted!to!the!board.!This!is!connected!to!GPIO04!and!GPIO26.!
1.6. Not Fitted Items
JP5!can!be!use!to!power!a!serial!LCD!with!data!on!TXD!line!from!the!Pi.!There!is!also!
5v!supply!on!JP5.!
!
!
2. Software Installation
It!is!best!to!start!with!a!brand!new!Raspbian!image.!Download!the!latest!from:!
https://www.raspberrypi.org/downloads/raspbian/!
CAN$A$(J3)$
Pin$number$
Function$
1!
CAN_L!
2!
CAN_H!
3!
GND!
4!
+12v!In!
CAN$B$(J4)$
Pin$number$
Function$
1!
CAN_L!
2!
CAN_H!
3!
GND!
4!
n/c!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!PiCAN2 DUO SMPS Rev D V1.4
!
SK Pang Electronics Ltd Ó 2021
www.skpang.co.uk
5
!
After!first!time!boot!up,!do!an!update!and!upgrade!first.!
sudo apt-get update
sudo apt-get upgrade
sudo reboot
Add!the!overlays!by:!
sudo nano /boot/config.txt
Add!these!4!lines!to!the!end!of!file:!
dtparam=spi=on
dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25
dtoverlay=mcp2515-can1,oscillator=16000000,interrupt=24
dtoverlay=spi-bcm2835-overlay
!
Reboot!Pi:!
sudo reboot

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!PiCAN2 DUO SMPS Rev D V1.4
!
SK Pang Electronics Ltd Ó 2021
www.skpang.co.uk
6
!
1.7. Bring Up the Interface
You!can!now!bring!the!CAN!interfaces!up:!
sudo /sbin/ip link set can0 up type can bitrate 500000
sudo /sbin/ip link set can1 up type can bitrate 500000
1.8. Installing CAN Utils
Install!the!CAN!utils!by:!
sudo apt-get install can-utils
Connect!the!PiCAN2!!Duo!to!your!CAN!network!via!screw!terminal!.!
To!send!a!CAN!message!on!can0!(CAN!B!J4)!use!:!
cansend can0 7DF#0201050000000000
This!will!send!a!CAN!ID!of!7DF.!Data!02!01!05!–!coolant!temperature!request.!
To!send!a!CAN!message!on!can1!(CAN!A!J3)!use!:!
cansend can1 7DF#0201050000000000
Connect!the!PiCAN!Duo!to!a!CAN-bus!network!and!monitor!traffic!by!using!command:!
candump can0
You!should!see!something!like!this:!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!PiCAN2 DUO SMPS Rev D V1.4
!
SK Pang Electronics Ltd Ó 2021
www.skpang.co.uk
7
!
3. Writing Your Own Software
You!can!write!your!own!application!software!in!either!C!or!Python.!
1.9. Application in Python
Download!the!Python-CAN!files!from:!
https://github.com/hardbyte/python-can/releases/tag/3.2.0
Unzip!and!copy!over!to!the!Pi.!
sudo python3 setup.py install
Bring!the!CAN!interface!up!if!it!is!not!already!done:!
sudo /sbin/ip link set can0 up type can bitrate 500000
Now!start!python3!
python3
To!sent!a!message!out!type!the!following!lines:!
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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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!PiCAN2 DUO SMPS Rev D V1.4
!
SK Pang Electronics Ltd Ó 2021
www.skpang.co.uk
8
!
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To!received!messages!and!display!on!screen!type:!
notifier = can.Notifier(bus, [can.Printer()])
1.10. Application in C
Bring!the!CAN!interface!up!if!it!is!not!already!done:!
sudo /sbin/ip link set can0 up type can bitrate 500000
Download!the!source!code!and!example!files!by!typing!the!following!in!the!command!
prompt:!
wget http://skpang.co.uk/dl/cantest.tar
Unpack!the!tar!file!and!change!into!directory!by:!
tar xf cantest.tar
cd linux-can-utils
The!example!file!is!called!cantest.c!to!edit!this!file,!type!the!following!in!the!command!
prompt:!
nano cantest.c
Line!77!is!the!CAN!message!to!be!sent!out.!
unsigned char buff[] = "7DF#0201050000000000";
7DF!is!the!message!ID!and!0201050000000000!is!the!data.!Change!the!data!to!suit.!
Press!CTRL-X!to!exit.!
To!compile!the!program!type:!
make
Check!there!are!no!errors.!To!run!the!program!type:!
./cantest