Find CAN Baudrate.

[jbonninFH]

Hello,
I have a project in C# which use CANApi2 with two PCAN module.
I want to know if it's possible to get the baudrate of the CAN bus which is connect to the PCAN.
I mean that I configure the Can connection (ID, net , ...) and open it. And on this connection, I want to get with a function all baudrate of the current CAN connected.
Is it possible?
Have you an idea for do that?
Thank.

[PEAK-Support]

Yes, that is possible. In the CANAPI2 you use Client & Net Handles. The Baudrate is a Property of the Net Handle.
Simply use the GetParam(...) function with the PARAM_BAUDRATE parameter, and you get back the Baudrate as BTR0BTR1-Code (which is simply to compare with the defined Baudrates)

[jbonninFH]

Hello,
Thanks for your reply but it's not exactly what I want.
I want to detect the baudrate of the CAN bus on which I'm connected.
I don't want to get the baudrate of the with GetParam() function because it's the baudrate that I set it.
Do you understand what I want?

[PEAK-Support]

HowTo find the BUS Baudrate without influence the CAN Bus:

• Be sure that minimum 2 other CAN nodes are communicate on the CAN Network (they must be "active")
• Set you CAN Interface from PEAK-System to listen only mode
• Set the Baud rate and listen on the Bus (there must be traffic on the bus)
• Check CANRead Value and see if you receive a valid CAN Frame - if yes - you got it - if not change to next baud rate and read again.
• Run until end of available Baud rate list or until you found the Baud rate.

[jbonninFH]

Thank you.
But how you cans check if the receive frame is valid or not? Have you a function to do that? Because I check the MsgType of the CANApi2.TCANMsg and if it's not 0 or 2 it's not a valid CAN frame.
And another question. How can I put my CAN interface in listen only mode with CANapi2 function?

[PEAK-Support]

If you read a real CAN Frame - the Baudrate/BTR0/BTR1 Values are valid ! If the Baudrate is wrong you will never see a valid CAN Frame on the bus - very easy...

Code: Select all

And another question. How can I put my CAN interface in listen only mode with CANapi2 function?

The CANAPI2 is a non free Development Tool. Please send serial number and company information to our support[at]peak-system.com email and we could send you a sample.