* Re: Acknowledging messages with SocketCAN
[not found] <CALr1zciumzF8ijW-o4YabN3oi=wf+Ph9N9XSH+b=b1UPQhgzww@mail.gmail.com>
@ 2013-06-04 16:33 ` Marc Kleine-Budde
0 siblings, 0 replies; only message in thread
From: Marc Kleine-Budde @ 2013-06-04 16:33 UTC (permalink / raw)
To: Mike Mogenson; +Cc: linux-can@vger.kernel.org
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Hello Mike,
please use the linux-can mailinglist (Cc'ed)
On 06/04/2013 06:21 PM, Mike Mogenson wrote:
> First, thank you for your project.
I'm just one of the developers working on this project, you're welcome.
> Second, I'm using your can-utils on a BeagleBone running Ubuntu with the
> 3.2 kernel. Everything is working well with my can0 device in loopback
> mode. However, when I connect a CAN enabled motor controller to the
> CANbus, the BeagleBone doesn't appear to acknowledge the motor
> controller's heartbeat message and the motor controller retries its
> message over and over.
It's normal behaviour that a CAN node repeats the message if it is not
acked on the bus.
> I don't see anything with candump or in
> /proc/net/can/stats, but I can see the message repeating over and over
> with an oscilloscope on the CANbus.
Ensure that your CAN network is properly terminated on both ends (120 Ohms).
Configure the bitrate of your d-can correctly, it must be the same as
the bitrate of your motor. With canutils:
canconfig can0 bitrate 1250000
or iproute2's ip (the "ip" from busybox doesn't work):
ip link set can0 type can bitrate 125000
Then activate your CAN:
ifconfig can0 up
> Do I have to configure SocketCAN on the BeagleBone
> to acknowledge messages? How can I set the BeagleBone to have a
> specific Node ID? To my knowledge, the heartbeat message is not
> directed at a specific Node ID, but I will eventually need to direct
> messages from CAN devices to the BeagleBone.
regards,
Marc
--
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