february 2014 industrial berry · 2014-09-29 · i i “industrialberry_datasheet” — 2014/1/22...

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CanBarry PI V 1.1

INDUSTRIALBERRY

www.industrialberry.com

February 2014

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Contents

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

2 Introduction 3

3 Hardware implementation 5

4 Software implementation 94.1 Real Time Clock . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.1.1 RTC with shell . . . . . . . . . . . . . . . . . . . . . . . 104.2 LED Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5 Components list 13

Bibliography 15

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List of Figures

2.1 CanBerry V1.1 on Raspberry PI . . . . . . . . . . . . . . . . . 42.2 CanBerry V1.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

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

File:CAN-Bus_Elektrische_Zweidrahtleitung . . . . . . . . 83.5 CANH Bus monitoring . . . . . . . . . . . . . . . . . . . . . . . 8

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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 1.1 . . . . . . . . . . . . . . . . . . . . . . . . . 14

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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 1.1 is an extension board for RaspBerry Pi. It is an OpenHardware Design. It has two functionalities: a can bus module and an on-board Real Time clock powered by a 12 mm battery. In fig 2.1 is shown theBoard on Raspberry PI. The CanBus is based on MCP2515 [1] SPI controllerand the MCP2551 [2] tranceiver. All functionalities are full integrated in stan-dard linux kernel, so, they can be avaible on fly, or at last recompiling linuxkernel to add canbus functionalities. The real time clock is based on DS1307Z[3] I2C controller. It is full compatible with linux too. Using I2C Kernel mod-ule, and standard kernel functions, date and hour can be set/get by simplecommands. On the bottom side is located an on board battery to guarantee adata autonomy more than 20 years. In chapter hardware there are all informa-tions on principal components, schematics to rebuild and modify RaspBerryPI board. In chapter Software is reported how all hardware can be used: asrecompile kernel, build simple user space function to set and get I2C data, etc...In chapter application is reported a typical example of how to use the board.

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Chapter 2 Introduction

Figure 2.1: CanBerry V1.1 on Raspberry PI

Figure 2.2: CanBerry V1.1

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Chapter 3

Hardware implementation

CanBarry PI 1.1 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 3.4).

You can see in fig.3.5 the signal on pin CANH

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Chapter 3 Hardware implementation

14/0

4/20

13 1

6:50

:38

D:\R

aspb

erry

_har

dwar

e\C

AN&R

TC\C

AN&R

TC1v

0\C

AN&R

TC.s

ch (S

heet

: 1/1

)

Bat

tery

Hol

der C

R20

32

GN

DG

ND

10k

10k

100n

F

32.7

68kH

z

GN

D

V+

GN

D

GN

DV+

MC

P25

15-I/

SO

GR

B2

RS

C 6

28-3

548

120R

18k

10k 10

0nF

100n

F

22pF22pF

GN

D

GN

D

GN

DG

ND

V+

GN

D

GN

D

4k7

GN

D

4k7V+

GN

D

n.c.

n.c. GN

Dn.c.

n.c. GN

D

GN

DG

ND

500R

500R

V+

V+

V+

V+

V+

1uF

16Mhz

GN

D

1 2 3 4

JP1

R8

R11

C8

X11

X22

Q2

1 2

JP2

OSC

IO

SCO

VBAT

GN

DSD

ASC

L

INT

VDD

IC3

F

F1

F

F2

1-+3

V31

2-+5

V2

3-SD

A03

4-D

NC

4

5-SC

L05

6-G

ND

6

7-G

PIO

77

8-TX

8

9-D

NC

910

-RX

10

11-G

PIO

011

12-G

PIO

112

13-G

PIO

213

14-D

NC

14

15-G

PIO

315

16-G

PIO

416

17-D

NC

1718

-GPI

O5

18

19-S

PI-M

OSI

1920

-DN

C20

21-S

PI-M

ISO

2122

-GPI

O6

22

23-S

PI-S

CLK

2324

-SPI

-CE0

-N24

25-D

NC

2526

-SPI

-CE1

-N26

RES

ET17

CS

16

SO15

SI14

SCK

13

INT

12

RX0

BF11

RX1

BF10

TX0R

TS4

TX1R

TS5

TX2R

TS6

VDD

18

TXC

AN1

RXC

AN2

CLK

OU

T3

OSC

27

OSC

18

VSS

9

IC2

1JP32 R10

TXD

1

RXD

4

VSS

2

VDD

3C

ANH

7

CAN

L6

RS

8

VREF

5

IC1

R4

R3

C4

C2

C7C5

R7

R5

C6

R9C3

R6

LED2

R1

LED1

R2

BAT100

C1

Q1

22

11

33

SD

A

SD

A

SD

AS

CL

SC

L

SC

L

LED

1LE

D2

OU

T

OU

T

OS

CI

OSCI

OS

CO

OSCO

PI_

5V

PI_

5VP

I_S

PI_

CE

0

PI_

SP

I_C

E0

PI_

SP

I_S

CLK

PI_

SP

I_S

CLK

PI_

SP

I_M

ISO

PI_

SP

I_M

ISO

PI_

SP

I_M

OS

I

PI_

SP

I_M

OS

I

PI_

GP

IO_P

IN22

PI_

GP

IO_P

IN22

MCP2551

Dra

wn

By:

Title

:Ve

rsio

n:

JP4

Figure 3.1: Electric diagram of CanBus block

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Figure 3.2: Electric diagram of RTC block

14/04/2013 16:51:00 D:\Raspberry_hardware\CAN&RTC\CAN&RTC1v0\CAN&RTC.sch (Sheet: 1/1)

Battery Holder CR2032

GNDGND

10k

10k

100nF

32.768kHz

GND

V+

GND

GND

V+

MCP2515-I/SOGRB2 RSC 628-3548

120R

18k

10k

100nF

100nF

22pF

22pF

GND

GND

GNDGND

V+

GND

GND

4k7GND

4k7

V+

GND

n.c.

n.c.

GND

n.c.

n.c.

GND

GND GND

500R

500R

V+

V+V

+

V+

V+

1uF

16M

hz

GND

1234

JP1

R8

R11

C8

X1 1X22

Q2

12

JP2OSCIOSCO

VBATGND SDA

SCL

INTVDD

IC3

F

F1

F

F2

1-+3V31 2-+5V 2

3-SDA03 4-DNC 4

5-SCL05 6-GND 6

7-GPIO77 8-TX 8

9-DNC9 10-RX 10

11-GPIO011 12-GPIO1 12

13-GPIO213 14-DNC 14

15-GPIO315 16-GPIO4 16

17-DNC17 18-GPIO5 18

19-SPI-MOSI19 20-DNC 20

21-SPI-MISO21 22-GPIO6 22

23-SPI-SCLK23 24-SPI-CE0-N 24

25-DNC25 26-SPI-CE1-N 26

RESET17

CS16

SO15

SI14

SCK13

INT12

RX0BF11

RX1BF10

TX0RTS4

TX1RTS5

TX2RTS6

VDD 18

TXCAN 1

RXCAN 2

CLKOUT 3

OSC2 7

OSC1 8

VSS 9

IC2

1JP

32

R10

TXD1

RXD4

VSS2

VDD3 CANH 7

CANL 6

RS 8

VREF 5

IC1

R4

R3

C4

C2

C7

C5

R7

R5

C6

R9

C3

R6

LED

2

R1

LED

1

R2

BAT

100

C1

Q1

22

11

33

SDA

SDA

SDASCL

SCL

SCL

LED1 LED2

OUT

OUT

OSCI

OS

CI

OSCOOS

CO

PI_5V

PI_5VPI_SPI_CE0

PI_SPI_CE0PI_SPI_SCLK

PI_SPI_SCLK

PI_SPI_MISO

PI_SPI_MISO

PI_SPI_MOSI

PI_SPI_MOSI

PI_GPIO_PIN22

PI_GPIO_PIN22

MC

P25

51

Drawn By:

Title:Version:

JP4

Figure 3.3: CanBerry Connector

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Chapter 3 Hardware implementation

Figure 3.4: CAN Bus example, image from http://en.wikipedia.org/wiki/File:CAN-Bus_Elektrische_Zweidrahtleitung

Figure 3.5: CANH Bus monitoring

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Chapter 4

Software implementation

How to prepare a SD Card with CAN kernel modulesDownload Wheezy raspbian -2013-12-24After 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/3.10.24+/kernel/drivers/spi/spi-bcm2708.koinsmod /lib/modules/3.10.24+/kernel/net/can/can.koinsmod /lib/modules/3.10.24+/kernel/drivers/net/can/can-dev.koinsmod /lib/modules/3.10.24+/kernel/net/can/can-raw.koinsmod /lib/modules/3.10.24+/kernel/net/can/can-bcm.koinsmod /lib/modules/3.10.24+/extra/spi-config.kodevices= \bus=0:cs=0:modalias=mcp2515:speed=10000000:gpioirq=25:pd=20:pds32-0=16000000:pdu32-4=0x2002:force_releaseinsmod /lib/modules/3.10.24+/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, 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

# GPIO On numbers should be from this list# 0, 1, 4, 7, 8, 9, 10, 11, 14, 15, 17, 18, 21, 22, 23, 24, 25

# Set up GPIO 17 and set to outputecho "17" > /sys/class/gpio/exportecho "out" > /sys/class/gpio/gpio17/direction


# Write output#Led1 Onecho "1" > /sys/class/gpio/gpio17/value#Led2 Onecho "1" > /sys/class/gpio/gpio21/value

# Clean upecho "17" > /sys/class/gpio/unexportecho "21" > /sys/class/gpio/unexport

nano gpio_off.sh


#!/bin/sh

# GPIO Off numbers should be from this list# 0, 1, 4, 7, 8, 9, 10, 11, 14, 15, 17, 18, 21, 22, 23, 24, 25


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Chapter 4 Software implementation


# Write output#Led1 Offecho "0" > /sys/class/gpio/gpio17/value#Led2 Offecho "0" > /sys/class/gpio/gpio21/value

# Clean upecho "17" > /sys/class/gpio/unexportecho "21" > /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

0603R1,R

2RMCF0603FT

499RCT-N

D0,04

0,082

4.7kΩ

0603R5,R

7RMCF0603JT

4K70C

T-N

D0,02

0,044

10kΩ

0603R3,R

8,R11

P10KGCT-N

D0,10

0,401

18kΩ

0603R4

P18KGCT-N

D0,10

0,102

22pf0603

C5,C

7445-1273-1-N

D0,10

0,203

100nf0603

C2,C

4,C8

445-1316-1-ND

0,100,30

11uf

0603C1

445-1322-1-ND

0,100,10

132.768kH

zQ2

X801-N

D0,49

0,491

16MHz

Q1

535-10226-1-ND

0,410,41

1DS1307Z

SOIC

8IC

3DS1307Z+

T3,11

3,111

MCP2515

SOIC

18IC

2MCP2515-I/SO

-ND

1,981,98

1MCP2551

SOIC

8IC

1MCP2551-I/SN

-ND

1,121,12

1RETA

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

26pos

2X

13SA

M1086-13-N

D2,97

2,971

PCB

2,502,50

Total14,88

Table5.1:C

anBerry

PiV1.1

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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. DS1307Z Datasheet. http://datasheets.maximintegrated.com/en/ds/DS1307.pdf.

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february 2014 industrial berry · 2014-09-29 · i i “industrialberry_datasheet” — 2014/1/22...

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