March 2015 INDUSTRIAL BERRY · i i “industrialberry_datasheet” — 2015/3/21 — 10:25 — page...

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CanBerry PI V 2.0

INDUSTRIALBERRY

www.industrialberry.com

March 2015

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Contents

1 License 11.1 Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Introduction 3

3 Hardware implementation 5

4 Software implementation 114.1 Real Time Clock . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1.1 RTC with shell . . . . . . . . . . . . . . . . . . . . . . . 124.2 LED Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

5 Components list 15

Bibliography 17

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List of Figures

2.1 CanBerry V2.0 on Raspberry PI . . . . . . . . . . . . . . . . . 42.2 CanBerry V2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.1 Electric diagram of CanBus block . . . . . . . . . . . . . . . . . 63.2 Electric diagram of RTC block . . . . . . . . . . . . . . . . . . 73.3 CanBerry Connector . . . . . . . . . . . . . . . . . . . . . . . . 73.4 Raspberry HAT Eeprom . . . . . . . . . . . . . . . . . . . . . . 83.5 CAN Bus example, image from http://en.wikipedia.org/wiki/

File:CAN-Bus_Elektrische_Zweidrahtleitung . . . . . . . . 83.6 CANH Bus monitoring . . . . . . . . . . . . . . . . . . . . . . . 9

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http://en.wikipedia.org/wiki/File:CAN-Bus_Elektrische_Zweidrahtleitung


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List of Tables

5.1 CanBerry Pi V 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . 16

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Chapter 1

License

Open-source hardware shares much of the principles and approach of free andopen-source software. In particular, we believe that people should be ableto study our hardware to understand how it works, make changes to it, andshare those changes. To facilitate this, we release all of the original design files(Eagle CAD) for the IndustrialBerry hardware. These files are licensed undera Creative Commons Attribution Share-Alike license, which allows for bothpersonal and commercial derivative works, as long as they credit Industrial-Berry and release their designs under the same license. The IndustrialBerrysoftware/firmware is also open-source.

1.1 DisclaimerIn no event shall Industrialberry be liable to the buyer or to any third partyfor any indirect, incidental, special, consequential, punitive or exemplary dam-ages (including without limitation lost profits, lost savings, or loss of businessopportunity) arising out of or relating to any product or service provided or tobe provided by Industrialberry, or the use or inability to use the same, even ifIndustrialberry has been advised of the possibility of such damages.

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Chapter 2

Introduction

CanBerry Pi V 2.0 is an extension board for RaspBerry Pi. It is an OpenHardware Design. It has two functionalities: a can bus module and an onboardReal Time clock powered by a 12 mm battery. In fig 2.1 is shown the Board onRaspberry PI B+. The CanBus is based on MCP2515 [1] SPI controller andthe MCP2551 [2] tranceiver. All functionalities are full integrated in standardlinux kernel, so, they can be avaible on fly, or at last recompiling linux kernelto add canbus functionalities. The real time clock is based on DS3231 [3](withinternal oscillator ) or DS1307Z [4] I2C controller. It is full compatible withlinux too. Using I2C Kernel module, and standard kernel functions, date andhour can be set/get by simple commands. On the bottom side is located an onboard battery to guarantee a data autonomy more than 20 years. In chapterhardware there are all informations on principal components, schematics torebuild and modify RaspBerry PI board. In chapter Software is reported howall hardware can be used: as recompile kernel, build simple user space functionto set and get I2C data, etc... In chapter application is reported a typicalexample of how to use the board.

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Chapter 2 Introduction

Figure 2.1: CanBerry V2.0 on Raspberry PI

Figure 2.2: CanBerry V2.0

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Chapter 3

Hardware implementation

CanBerry PI 2.0 is composed by two blocks: a CanBus Module shown in Fig.3.1 and a Real Time Clock shown in 3.2 The SMD Jumper JP2 must be usedto connect the RTC Int pin to Raspberry GPIO7.MCP2515 is a stand alone SPI canbus controller full integrated in linux

kernel. At the start, the driver was implemented as a block device. Recently itis assumed to be a network module into the kernel. It is supplied by 3.3V fromraspberry connector (fig 3.3 ). MCP2551 is supplied by 5V from Raspberryconnector insted. So, to match voltage physical level between the two chips, avoltage matching made by R3 and R4 has been used. The SMD Jumper JP3must be used for the first and the last device of CAN Bus, this jumper providesthe 120 Ω termination (see fig 3.5).

The Raspberry Pi B+ has been designed specifically with add-on boards inmind and today we are introducing HATs (Hardware Attached on Top). Asignificant feature of HATs is the inclusion of a system that allows the B+ toidentify a connected HAT and automatically configure the GPIOs and driversfor the board, making life for the end user much easier! The automatic con-figuration is achieved using 2 dedicated pins (ID SD and ID SC) on the 40WB GPIO header that are reserved for an I2C EEPROM CAT24C32WI. TheEEPROM (see fig 3.4).You can see in fig.3.6 the signal on pin CANH

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Chapter 3 Hardware implementation

Figure 3.1: Electric diagram of CanBus block

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Figure 3.2: Electric diagram of RTC block

Figure 3.3: CanBerry Connector

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Chapter 3 Hardware implementation

Figure 3.4: Raspberry HAT Eeprom

Figure 3.5: CAN Bus example, image from http://en.wikipedia.org/wiki/File:CAN-Bus_Elektrische_Zweidrahtleitung

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Figure 3.6: CANH Bus monitoring

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Chapter 4

Software implementation

How to prepare a SD Card with CAN kernel modules

Download Wheezy raspbian 2014-09-09

After your raspberry has been booted, go to home directory:

cd /home/pi/nano can-start.sh

add these lines to the script

#!/bin/sh#Caninsmod /lib/modules/3.12.28+/kernel/drivers/spi/spi-bcm2708.koinsmod /lib/modules/3.12.28+/kernel/net/can/can.koinsmod /lib/modules/3.12.28+/kernel/drivers/net/can/can-dev.koinsmod /lib/modules/3.12.28+/kernel/net/can/can-raw.koinsmod /lib/modules/3.12.28+/kernel/net/can/can-bcm.koinsmod /lib/modules/3.12.28+/extra/spi-config.ko

devices=\bus=0:cs=0:modalias=mcp2515:speed=10000000:gpioirq=25:pd=20:pds32-0=16000000:pdu32-4=0X2002:force_releaseinsmod /lib/modules/3.12.28+/kernel/drivers/net/can/mcp251x.koip link set can0 up type can bitrate 1000000

Run the script:

sudo sh can-start.sh

So the system is ready, then you can use standard canbus command to usethe peripheral:

candump can0 -> to monitoring can bus trafficcansend can0 7DF#0201050000000000 -> to send canbus commands

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Chapter 4 Software implementation

4.1 Real Time Clock

It is possible use the RTC IC with the terminal or with a compiled program.The DS1307Z is a device I2C, and then we must install i2c-tool

sudo aptitude install i2c-tool

and libi2c-dev before use it.

sudo aptitude install libi2c-dev

4.1.1 RTC with shell

The following code allow the management of the RTC with the i2c-tool directlyfrom the shell. Verify the DS1307Z address 0x68 with

sudo i2cdetect -y 0

for Raspberry Rev 1 or

sudo i2cdetect -y 1

for Rev 2 and B+, because the I2C bus address changed from 0 to 1.Run the scripts as root:

modpro be rtc-ds1307

Then, run

echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-0/new_device (if you havea Rev 1 Pi)

echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device (if you havea Rev 2 Pi)

Set RTC with

hwclock -w

Read RTC with

hwclock -r

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4.2 LED Control

4.2 LED Control

Go to home directory:

cd /home/pi/nano gpio_on.sh


#!/bin/sh

# Set up GPIO 27 and set to outputecho "27" > /sys/class/gpio/exportecho "out" > /sys/class/gpio/gpio27/direction


# Write output#Led1 Onecho "1" > /sys/class/gpio/gpio27/value#Led2 Onecho "1" > /sys/class/gpio/gpio4/value

# Clean upecho "27" > /sys/class/gpio/unexportecho "4" > /sys/class/gpio/unexport

nano gpio_off.sh


#!/bin/sh



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Chapter 4 Software implementation

# Write output#Led1 Offecho "0" > /sys/class/gpio/gpio27/value#Led2 Offecho "0" > /sys/class/gpio/gpio4/value

# Clean upecho "27" > /sys/class/gpio/unexportecho "4" > /sys/class/gpio/unexport

Run the scripts as root:

sh gpio_on.shsh gpio_off.sh

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Chapter 5

Components list

In the table 5.1 we can see the Bill of Material for the board, all the componentsare available on-line. For simplicity, every component has a DigiKey order code(www.digikey.com).

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Chapter 5 Components list

Quantity

ValuePackage

PartsDigikey-cod

Unit

Price$

2Yellow

1206LED

1,LED2

754-1144-1-ND

0,210,42

1120

Ω0603

R10

RMCF0603JT

120RCT-N

D0,02

0,022

499Ω

0603R13,R

14RMCF0603FT

499RCT-N

D0,04

0,085

4.7kΩ

0603R1,R

2,R3,R

6,R7

RMCF0603JT

4K70C

T-N

D0,02

0,104

10kΩ

0603R5,R

8,R11,R

15P10K

GCT-N

D0,10

0,401

18kΩ

0603R4

P18KGCT-N

D0,10

0,102

22pf0603

C5,C

7445-1273-1-N

D0,10

0,204

100nf0603

C1,C

2,C4,C

8445-1316-1-N

D0,10

0,401

1uf0603

C9

445-1322-1-ND

0,100,10

116M

Hz

HC49/U

SQ1

535-10226-1-ND

0,410,41

1MCP2551

SOIC

8IC

1MCP2551-I/SN

-ND

1,121,12

1MCP2515

SOIC

18IC

2MCP2515-I/SO

-ND

1,981,98

1DS3231

SOIC

16IC

4DS3231S-N

D8.35

8.351

CAT

24C32W

I-GT3

SOIC

8IC

5CAT

24C32W

I-GT3C

T-N

D0.57

0.571

RETA

INER

COIN

12MM

BAT

100BAT

-HLD

-012-SMT-N

D0,27

0,271

TER

MIN

AL-3-PC

B3X

3.5mm

X1

277-8807-ND

0,370,37

1Header

40pos

2X

20SA

M1086-20-N

D3.30

3.301

PCB

3.203.20

Total21.39

Table5.1:C

anBerry

PiV2.0

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Bibliography

[1] Microchip. MCP2515 Datasheet. http://ww1.microchip.com/downloads/en/devicedoc/21801e.pdf.

[2] Microchip. MCP2551 Datasheet. http://ww1.microchip.com/downloads/en/devicedoc/21667d.pdf.

[3] Maxim. DS3231 Datasheet. http://datasheets.maximintegrated.com/en/ds/DS3231-DS3231S.pdf.

[4] Maxim. DS1307Z Datasheet. http://datasheets.maximintegrated.com/en/ds/DS1307.pdf.

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