CAN adapter - Arduino Shield

This one will work perfectly 

https://www.sparkfun.com/products/13262

note uses MCP2515 => Implements CAN V2.0B at 1 Mb/s

and MCP2551 for interface => ISO 11898-2 compliance

for ISO 11898-3 ( Low speed/Fault tolerant CAN ) a different driver IC is required

New.User

This one will work perfectly 

https://www.sparkfun.com/products/13262

note uses MCP2515 => Implements CAN V2.0B at 1 Mb/s

and MCP2551 for interface => ISO 11898-2 compliance

for ISO 11898-3 ( Low speed/Fault tolerant CAN ) a different driver IC is required

 Hi New.User, thanks for your response.

I have CAN-BUS Shield V2.0 from Seeed http://wiki.seeedstudio.com/CAN-BUS_Shield_V2.0/ 

With MCP2515. Do you know how to make the IoT aware of the CAN interface in the shield?

In order to use that shield as a regular Linux CAN interface, you need to hook up its controller with the CAN stack of Linux (AF_CAN, socket-based interface).

There is linux/drivers/net/can/spi/mcp251x.c which seems to be able to drive the CAN controller on the card. However, it is so far designed only for ARM systems which use device trees to describe their hardware wiring. We are on a x86 device that uses ACPI for that, but I'm not even sure if that PC-originating ACPI is already able to describe such a scenario.

Either patching of the driver will be needed in order to tell it to look for ACPI matches - and then also patch ACPI tables. Or some glue driver code needs to be written to register a platform device that describes how the MCP2515 is attached to SPI, at which speed, with which chip select line and maybe more. There is unfortunately no direct reference case for that in the kernel.

IOW: Doable, but will require quite some research and trial-and-error with the hardware in hands.

And alternative path would be looking at some Arduino library for the shield and open-coding the CAN controller access via mraa and its SPI abstraction, i.e. writing an own CAN driver in application context. That may work for slower use cases / lower bandwidth but could run into limitations when you want to / need to exploit faster CAN connections.

Laura_Martin

I have CAN-BUS Shield V2.0 from Seeed http://wiki.seeedstudio.com/CAN-BUS_Shield_V2.0/ 

With MCP2515. Do you know how to make the IoT aware of the CAN interface in the shield?

 You’ll need to use the Arduino IDE to program the IOT to see the shield. Suggest to get yourself an Arduino UNO (ebay), plug your CAN module, install the free Arduino IDE and download and install one of the many CAN libraries for Arduino ( e.ghttps://github.com/autowp/arduino-mcp2515). Get that working first! Libraries usually come with examples on how to use its calls. Once OK and the Arduino does most of the things you expect the IOT to do, transfer the module to the IOT and recompile your program for Galileo 2 … (google instructions on how to use the Arduino IDE with the IOT).