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linux-can / can-utils

Linux-CAN / SocketCAN user space applications
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slcand arbitrary serial-can controller #18

Closed reinzor closed 8 years ago

reinzor commented 8 years ago

Hi all,

Up until now, I've been working with SocketCAN via CANUSB adapters from Lawycel (http://www.can232.com/?page_id=16). However, now we received a new platform with another serial-can controller from axiomtek (http://www.axiomtek.com/Default.aspx?MenuId=Products&FunctionId=ProductView&ItemId=8270).

I am able to communicate with the CAN controller via serial and receive CAN frames. However, using slcand to create a socketcan interface does not work. As I see here https://github.com/linux-can/can-utils/blob/master/slcand.c , the slcand program sends specific commands to the serial bus and then creates a bridge between the socket and serial. However, the commands are different for my CAN controller.

Can somebody give me some pointers how to get SocketCAN to work with an arbitrary serial-can controller?

I'm am very new to these low level Linux things so I really would appreciate your help / corrections. Thanks in advance,

-Rein

reinzor commented 8 years ago

Answered via mailing list

Mike351c commented 8 years ago

To connect via can bus. The proper serial kick code must be obtained either data acquisition or serial data recorder. Industry has made the can bus propriety for code reading, but each manufacturer uses a different kick to get deeper into the bus.

Mike On Apr 22, 2016 7:31 AM, "Rein Appeldoorn" notifications@github.com wrote:

Hi all,

Up until now, I've been working with SocketCAN via CANUSB adapters from Lawycel (http://www.can232.com/?page_id=16). However, now we received a new platform with another serial-can controller from axiomtek ( http://www.axiomtek.com/Default.aspx?MenuId=Products&FunctionId=ProductView&ItemId=8270 ).

I am able to communicate with the CAN controller via serial and receive CAN frames. However, using slcand to create a socketcan interface does not work. As I see here https://github.com/linux-can/can-utils/blob/master/slcand.c , the slcand program sends specific commands to the serial bus and then creates a bridge between the socket and serial. However, the commands are different for my CAN controller.

Can somebody give me some pointers how to get SocketCAN to work with an arbitrary serial-can controller?

I'm am very new to these low level Linux things so I really would appreciate your help / corrections. Thanks in advance,

-Rein

— You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub https://github.com/linux-can/can-utils/issues/18

arasbm commented 8 years ago

@reinzor could you share the response you got on the mailing list? I am running into a very similar issue. I am working with a PC with built-in ODB-II port and it shows up as tty03. However, I can not find any way to map this serial port using socketcan and canutils. Can you share some details about how you solved your problem?

reinzor commented 8 years ago

@arasbm ; this is the mail response:

Hello Rein,

Up until now, I've been working with SocketCAN via CANUSB adapters from Lawycel (http://www.can232.com/?page_id=16). However, now we received a new platform with another serial-can controller from axiomtek (http://www.axiomtek.com/Default.aspx?MenuId=Products&FunctionId=ProductView&ItemId=8270).

I am able to communicate with the CAN controller via serial and receive CAN frames. However, using slcand to create a socketcan interface does not work. As I see here https://github.com/linux-can/can-utils/blob/master/slcand.c , the slcand program sends specific commands to the serial bus and then creates a bridge between the socket and serial. However, the commands are different for my CAN controller.

Yes. That's pretty bad to reinvent the wheel by creating 'just another' CAN ASCII protocol :-(

Can somebody give me some pointers how to get SocketCAN to work with an arbitrary serial-can controller?

The slcan driver supports the standard SLCAN protocols as you know from Lawicel:

https://github.com/linux-can/can-misc/blob/master/docs/SLCAN-API.pdf

I'm am very new to these low level Linux things so I really would appreciate your help / corrections. Thanks in advance,

You would need to extend the slcan.c driver and the slcan tools from the can-utils to cope with the Axiomtek protocol.

Alternatively you can write a user space application that talks to the Axiomtek device and send the CAN frames to a virtual CAN (e.g. vcan0) so that you can use the can-utils on top of that virtual CAN.

Just a different idea: As you obviously have a full-size mini PCI-Express module - why don't you use a proper CAN PCIe interface with a PCI-connected SJA1000 controller which is already supported by Linux?

All this serial line encapsulation stuff does not support the really good (configuration) things and error handling from SocketCAN.

Regards, Oliver

ps. Maybe Axiomtek can also provide a SLCAN compatible firmware ...

At the end, we did not continue with this specific controller since it was not compatible with the SLCAN protocol specified here https://github.com/linux-can/can-misc/blob/master/docs/SLCAN-API.pdf