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List:       linux-can
Subject:    Re: [Socketcan-users] AM335x CAN/D_CAN
From:       bruce bushby <bruce.bushby () gmail ! com>
Date:       2012-06-19 7:58:13
Message-ID: CAHvj1qb0anDv8W3Jhgn5u-s+6=Kz283RJsFDonctP5qdn9fk1A () mail ! gmail ! com
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Hi Wolfgang/Oliver

Thank you for your response, much appreciated!! Clearly I've got some
reading to do :)

Regards
Bruce Bushby





On Tue, May 22, 2012 at 8:01 PM, Wolfgang Grandegger <wg@grandegger.com> wrote:
> Hello,
>
> I switched the discussion to the new Linux-CAN mailing list.
>
> On 05/22/2012 05:50 PM, bruce bushby wrote:
>> Greetings
>>
>> I'm hoping a list member would be so kind as to offer some basic
>> explanations of how one would use the CAN bus provided by AM335x. I
>> understand Linux, but struggle with electronics.
>>
>> I have read this discussion: http://comments.gmane.org/gmane.linux.can/1142
>> What is the difference between C_CAN and D_CAN?
>
> As I see it, the D_CAN is a more advanced variant of the C_CAN
> controller. See also:
>
> http://www.semiconductors.bosch.de/en/ipmodules/can/canipmodules/c_can/c_can.asp
> http://www.semiconductors.bosch.de/en/ipmodules/can/canipmodules/d_can/d_can.asp
>
> Patches to add D_CAN support to the Linux-CAN C_CAN driver have been
> posted recently for mainline inclusion and are currently reviewed.
>
>> http://www.spinics.net/lists/linux-omap/msg67538.html
>> Does D_CAN have anything to do with mcp2515?
>
> No, nothing apart from the fact that both are CAN controllers. The
> mcp2515 is connected via SPI bus and from another company.
>
>> In order to connect the am335x CAN line to a CAN bus, would I need to
>> add a CAN transceiver?
>
> Hardware-wise, yes.
>
>> Is the am335x an "in memory CAN" ... ie I wouldn't need to worry about
>> SPI bus performance?
>
> Right. On the AM335x, the D_CAN controller is integrated into the SOC.
> There is no SPI involved.
>
>> Any explanations and help much appreciated!
>
> Hope it's useful.
>
> Wolfgang.
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