Re: Reading messages that use BAM, or have a DLC larger than 8

[Marc Kleine-Budde <mkl@pengutronix.de>]

[-- Attachment #1: Type: text/plain, Size: 975 bytes --]

On 08/21/2013 08:43 PM, Brent Sink wrote:
> How do I read J1939 messages that use the BAM format?  Some of the
> diagnostic messages that are on the DM01 message have a DLC that is
> often larger than 8 bytes when the message contains more than one
> error.  Is there something special that I need to do to enable reading
> these messages?  Thanks!

With mainline linux you just receive raw CAN frames. I'm not a j1939
expert, as far as I can see, BAM is a transport protocol for CAN.

There are two options:
1) You have to implement the BAM protocol yourself either,
   a) inside the kernel or
   b) inside userspace.
2) Talk to Kurt (Cc'ed) if his j1939 patches support BAM.

Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 259 bytes --]