SK Pang Electronics RSP-PICAN3 User manual

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SK&Pang&Electronics&Ltd&©&2019&
www.skpang.co.uk&
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Product&name&& PiCAN3&CAN-Bus&Board&for&Raspberry&Pi&4&with&3A&SMPS&+&RTC&
Model&number& RSP-PICAN3&
Manufacturer& & SK&Pang&Electronics&Ltd&
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PiCAN3 CAN-Bus with 3A SMPS + RTC
USER GUIDE V1.0

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SK&Pang&Electronics&Ltd&©&2019&
www.skpang.co.uk&
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Contents'
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Table'of'Contents'
1.!Introduction'............................................................................................................'3!
1.1.!Features!................................................................................................................................................................!3!
2.!Hardware'Installation'..............................................................................................'3!
1.2.!Configuring!DB9!Connector!.........................................................................................................................!4!
1.3.!OBDII!Cable!.........................................................................................................................................................!4!
1.4.!CAN!Cable!.............................................................................................................................................................!4!
1.5.!Screw!Terminal!..................................................................................................................................................!5!
1.6.!120Ω!Terminator!.............................................................................................................................................!5!
1.7.!LED!..........................................................................................................................................................................!5!
3.!Software'Installation'...............................................................................................'5!
1.8.!Installing!CAN!Utils!..........................................................................................................................................!6!
1.9.!Bring!Up!the!Interface!....................................................................................................................................!6!
4.!Real'Time'Clock'(RTC)'Software'Installation'.............................................................'7!
5.!Python'Installation'and'Use'.....................................................................................'9!
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SK&Pang&Electronics&Ltd&©&2019&
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1. Introduction'
his!PiCAN2!board!provide!CAN-Bus!capability!for!the!Raspberry!Pi!4.!It!uses!the!
Microchip!MCP2515!CAN!controller!with!MCP2551!CAN!transceiver.!Connection!are!
made!via!DB9!or!3!way!screw!terminal.!This!board!includes!a!3A!switch!mode!power!
suppler!that!powers!the!Pi!is!well.!
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!standard!9-way!sub-D!connector!or!screw!terminal!
•Compatible!with!OBDII!cable!
•Solder!bridge!to!set!different!configuration!for!DB9!connector!
•120Ω!terminator!ready!
•Serial!LCD!ready!
•LED!indicator!
•Foot!print!for!two!mini!push!buttons!
•Four!fixing!holes,!comply!with!Pi!Hat!standard!
•SocketCAN!driver,!appears!as!can0!to!application!
•Interrupt!RX!on!GPIO25!
•5v!3A!SMPS!to!power!Raspberry!Pi!and!accessories!from!DB9!or!screw!
terminal!
oReverse!polarity!protection!
oHigh!efficiency!switch!mode!design!
o6v!to!20v!input!range!
•RTC!with!battery!backup!(battery!not!included,!requires!CR1225!cell)!
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.!
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1.2. Configuring'DB9'Connector'
The!CAN!connection!can!be!made!via!the!DB9!connector.!The!connector!be!configured!
for!different!pinout.!Depend!if!you!are!using!an!OBDII!cable!or!a!CAN!cable.!
1.3. OBDII'Cable'
Close!the!solder!bridges!on!the!lefthand!side!on!SJ1,!SJ2!and!SJ3!as!shown!with!a!red!
line.!!
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1.4. CAN'Cable'
Close!the!solder!bridges!on!the!righthand!side!on!SJ1,!SJ2!and!SJ3!as!shown!with!a!
green!line.!
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DB9$Pin$
number$
Function$
2!
GND!
3!
CAN_H!
5!
CAN_L!
DB9$Pin$
number$
Function$
3!
GND!
7!
CAN_H!
2!
CAN_L!

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1.5. Screw'Terminal'''
The!CAN!connection!can!also!be!made!via!the!4!way!screw!terminal.!
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1.6. '120Ω'Terminator'
There!is!a!120Ω!fitted!to!the!board.!To!use!the!terminator!solder!a!2way!header!pin!to!
JP1!then!insert!a!jumper.!
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1.7. LED'
There!is!a!red!LED!fitted!to!the!board.!This!is!connected!to!GPIO22.!
3. Software'Installation'
It!is!best!to!start!with!a!brand!new!Raspbian!image.!Download!the!latest!from:!
https://www.raspberrypi.org/downloads/raspbian/!
After!first!time!boot!up,!do!an!update!and!upgrade!first.!
sudo apt-get update
sudo apt-get upgrade
sudo reboot
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Pin$number$
Function$
1!
CAN_H!
2!
CAN_L!
3!
GND!
4!
+12v!In!

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Add!the!overlays!by:!
sudo nano /boot/config.txt
Add!these!3!lines!to!the!end!of!file:!
dtparam=spi=on
dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25
dtoverlay=spi-bcm2835-overlay
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Reboot!Pi:!
sudo reboot
1.8. 'Installing'CAN'Utils'
Install!the!CAN!utils!by:!
sudo apt-get install can-utils
1.9. Bring'Up'the'Interface'
You!can!now!bring!the!CAN!interface!up!at!500kbps:!
sudo /sbin/ip link set can0 up type can bitrate 500000
To!send!a!CAN!2.0!message!use!:!
cansend can0 7DF#0201050000000000

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Connect!the!PiCAN!to!a!CAN-bus!network!and!monitor!traffic!by!using!command:!
candump can0
You!should!see!something!like!this:
4. Real'Time'Clock'(RTC)'Software'Installation'
Insert!a!CR1220!battery!(not!supplied)!into!battery!holder.!Ensure!the!“+”!is!facing!
upward.!
Install!the!i2c-tools!by:!
sudo apt-get install i2c-tools
Then!check!the!RTC:!
sudo i2cdetect -y 1
You!should!see!68!or!UU!on!address!0x68:!
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Add!the!overlays!by:!
sudo nano /boot/config.txt
Add!these!lines!to!the!end!of!file:!
dtparam=i2c_arm=on
dtoverlay=i2c-rtc,pcf8523
Reboot!Pi:!
sudo reboot
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Now!you!need!to!disable!the!"fake!hwclock"!which!interferes!with!the!'real'!hwclock!
sudo apt-get -y remove fake-hwclock
sudo update-rc.d -f fake-hwclock remove
sudo systemctl disable fake-hwclock
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Start!the!original!hw!clock!script!by:!
sudo nano /lib/udev/hwclock-set
and!comment!out!these!three!lines:!
#if [ -e /run/systemd/system ] ; then
# exit 0
#fi
and!comment!out!these!two!lines:!
#/sbin/hwclock --rtc=$dev --systz --badyear
#/sbin/hwclock --rtc=$dev --systz
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!PiCAN&3&Rev&C&1.0&
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SK&Pang&Electronics&Ltd&©&2019&
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Reboot!the!Pi.!
Ensure!the!Ethernet!cable!or!Wifi!is!on.!This!will!get!the!time!from!the!network.!!
Set!the!clock!by:!
sudo hwclock -w
To!read!the!clock:!
sudo hwclock -r
5. Python'Installation'and'Use'
Ensure!the!driver!for!PiCAN!3!board!is!installed!and!working!correctly!first.!
Clone!the!pythonCan!repository!by:!
git clone https://github.com/hardbyte/python-can
cd python-can
sudo python3 setup.py install
Check!there!is!no!error!been!displayed.!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!PiCAN&3&Rev&C&1.0&
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SK&Pang&Electronics&Ltd&©&2019&
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Bring!up!the!can0!interface:!
sudo /sbin/ip link set can0 up type can bitrate 500000
Now!start!python3!and!try!the!transmit!with!CAN!frame.!
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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To!received!messages!and!display!on!screen!type!in:!
notifier = can.Notifier(bus, [can.Printer()])