INNO USB-CAN MODULE User Manual

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USB-CAN MODULE User Manual

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1. Compatible with Raspberry Pi Zero/Zero W/2B/3B/3B+.

2. Full support for CAN bus 2.0A and 2.0B specification.

3. Elimination the need for software drivers when you run Debian9 system of Raspberry Pi.

4. Comes with demos of Socket CAN, save your development time.

5. “plug and play” (hot-pluggable) USB device ,no external power required.

6. On board high-speed STM32 microcontroller, stronger data processing ability and lower power

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General Description:

USB-CAN module is a “plug and play ” and bi-directional port powered USB to CAN converter

which realizes long-distance communication between your Raspberry Pi and other devices stably

though CAN- Bus connection.

With small size and convenient operation, It’s a cost-effective solution that are safe and reliable

for all your data-conversion / device-protection applications for any experienced engineer

interfacing to expensive industrial equipment yet simple enough for home use by an amateur

hobbyist.

Features:

consumption.

6.Wider CAN baud rate, 20Kbps----1Mpbs can be programmed arbitrarily.

7. Power supply and signal isolation ,Built-in surge and static protection.

8. 120 Ohm selectable jumper feature.

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1. Pin Out Configuration

2. 120 Ohm resistor setting.

Hardware Description

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Disable 120 Ohm resistor. Enable120 Ohm resistor.

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1. CAN Communication Test Demo

(1) Prepare two USB-CAN module and two Raspberry Pi board. Connect the H and L port of

(2) Down the the demo image from INNO wiki page:

(3) Execute commands to visited the test demo.

(4) Execute following commands in serial terminal. You should see the “can 0” socket can device.

(5) Set one Pi as receiver, execute following commands in serial terminal. Now this Raspberry pi

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Software Description

Run demo for two Raspberry Pi：

USB-CAN module to other’s port, and then insert into the USB Host of Raspberry PI board.

http://www.inno-maker.com/wiki/doku.php?id=usb_can

Or http://www.inno-maker.com/wiki/

Note :You must use a TF card at least than 16Gb, Otherwise it will write failed.

ifconfig –a

is blocked.

./can0_receive

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(6) Set other Pi as sender, execute following commands.

(7) You should see that the receiver has received the packet.

./can0_send

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Run demo for only one Raspberry Pi：

In this case, you also can insert two USB-CAN module into a Raspberry PI board to test. You

should see two can socket “can 0” and “can 1” devices. So notice that you need to modify the

code to change “can 0” to “can 1” when you use “can 1” device.

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2. Linux C Programing

(1) Preparations:

(2) For Sender’s code:

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Now with previous demo’s code to show you how to program socket can in linux. The socket

can is an implementation of CAN protocols(Controller Area Network) for Linux. CAN is a

networking technology which has widespread use in automation, embedded devices, and

automotive fields. While there have been other CAN implementations for Linux based on

character devices, Socket CAN uses the Berkeley socket API, the Linux network stack and

implements the CAN device drivers as network interfaces. The CAN socket API has been designed

as similar as possible to the TCP/IP protocols to allow programmers, familiar with network

programming, to easily learn how to use CAN sockets.

Elimination the need for software drivers when you run Debian9 system of Raspberry

Pi.(2018-06-27-raspbian-stretch.img is validated already)or later.

If you meet problems in other system, You need to reconfigure the kernel drivers. Enable

gs_usb can and install gs_usb.ko into system. So notice that if you only compile this drivers, It

may fail to load in system. At this time, compile fully with new configure.

The compiled firmware with LINUX -4.14.50 version is available from our wiki link as below:

http://www.inno-maker.com/wiki/doku.php?id=usb_can

Or http://www.inno-maker.com/wiki/

Note :You must use a TF card at least than 16Gb, Otherwise it will write failed.

Step 1: Create the socket, If an error occurs then the return result is -1.

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Step 2: Locate the interface to “can0” or other name you wish to use. The name will show when

you execute “./ifconfig –a”.

Step 3: Bind the socket to “can0”.

Step 4: Disable sender’s filtering rules,this program only send message do not receive packets.

Step 5: Assembly data to send.

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(3) For Receiver’code:

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Step 6: Send message to the can bus.You can use the return value of write() to check whether all

data has been sent successfully .

Step 7: Close can0 device and disable socket.

step 1 and step 2 is same as Sender’s code.

step 3:It’s different from Sender’s.

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Version

Description

Author

Date

E-mail

V1.0.0.0

First edition

Calvin

2019.01.015

[e-mail]

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Step 4：Define receive filter rules,we can set more than one filters rule。

Step 5: Read data back from can bus.

For more Socket CAN detail please refer to below link:

https://www.kernel.org/doc/Documentation/networking/can.txt

Version Descriptions

If you have any suggestions,ideas, codes and tools please feel free to email to me. I will update

the user manual and record your name and E-mail in list. Look forward to your letter and kindly

share.

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