[beagleboard] CAN bus and RS-485 Expansion Boards

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1

Greetings All,

is there any interest in having a CAN Bus and RS-485 expansion boards
for the beagle?

thanks
Dave

2

Hi Dave,

Both sound very interesting to me! RS-485 is my preference because of
its better speed and greater flexibility. Are you planning to isolate
the bus?

Good luck,
siñ

3

Seppo,

i am open to suggestions, feel free to post them here:

http://www.elinux.org/BeagleBoard_Barker

thanks
Dave

4

I think it’s a great idea…and really looking forward for this development.

5

CAN bus would be great

Mathieu

6

Hi guys,
I myself prefer RS-485.

Cheers

7

Greetings All,

the plan is to have CAN bus and RS-485, along with a few gpios, on the same board which will retail for $59.00. in addition we would have some CAN bus gpio expander modules available based on the MCP25020 from Microchip.

http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010400

thoughts?

Dave

8

I would never go with a 485 bus today.

I would go with a slow ethernet, with a hub.

I have seen 485 busses get out of hand, ask to do more than they were ever designed to do

IMHO, and few bucks will buy you a cup of coffee at mcDonalds.

Chip

Renaux Christian wrote:

9

the plan is to have CAN bus and RS-485, along with a few gpios, on the same board which will retail for $59.00.

Do you have have a particular CAN controller in mind?

– Damien

10

Damien,

my intention was to use the MCP2515 from microchip. it is supported under SocketCAN and can run at 3.3V which makes the level shifting a lot easier.


thanks
Dave


— On Wed, 4/28/10, Damien Dusha d.dusha@gmail.com wrote:


> From: Damien Dusha d.dusha@gmail.com
> Subject: Re: [beagleboard] Re: CAN bus and RS-485 Expansion Boards
> To: beagleboard@googlegroups.com
> Date: Wednesday, April 28, 2010, 11:50 AM
>
> > the plan is to have CAN bus and RS-485, along with a few gpios, on the same board which will retail for $59.00.
>
> Do you have have a particular CAN controller in mind?
>
> – Damien
>
> –
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11

my intention was to use the MCP2515 from microchip. it is supported under SocketCAN and can run at 3.3V which makes the level shifting a lot easier.

And they’re about half the price of the SJA1000 too :slight_smile: (keeps BMC down, even before considering level translators…)

How mature is the SPI support for Linux on the OMAP (I’m new to the OMAP platform, but I’m interested because we may be moving to an OMAP platform in the future)?

– Damien

12

Damien,

spi support is very robust, i already have the MCP2515 working with the beagle using the OpenCAN drivers. very easy to use.

Dave

13

Excellent. No objections here then.

– Damien