[CAN-FD] Vehicle Diagnostic Communication Part 87 [python-can 1]

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https://www.simulationroom999.com/blog/diagnostic-communication-en-back-issue/

Introduction.
Simulation configuration
Difference between CAN and CAN-FD usage in python-can
Asc format for CAN-FD
Conclusion.

Introduction.

Explanation toward simulation of CAN-FD in python-can.

Simulation configuration

Let’s try to control CAN-FD with python-can.
First, let’s check the simulation configuration.

BusMaster is not used in this case.
Or rather, it cannot be used.
The reason is that it does not support CAN-FD.
It is said that it is possible to support CAN-FD with add-ons, but it will probably incur some costs.

Difference between CAN and CAN-FD usage in python-can

Let me explain the difference between CAN and CAN-FD usage in python-can.

Basically, there is no big difference.
There is only an option for CAN-FD.
The format of asc played by can.player is different between CAN and CAN-FD, so some adjustment may be necessary.
However, I have not tried it yet, so I am aware that this is probably the extent of the difference.

Asc format for CAN-FD

The asc format of CAN-FD is as follows.

// CAN
0.010000 1  111    Rx         d 8 11 22 33 44 55 66 77 88

// CAN-FD
0.000000 CANFD   1 Rx 111 1 1 d 8 11 22 33 44 55 66 77 88

It is similar, but with slightly more parameters.
The breakdown of the parameters is as follows.

0.000000(timestamp) CANFD 1(line) Rx 111(CANID) 1(FDF) 1(BSR) d 8 11 22 33 44 55 66 77 88

The two “1″s along the way indicate the FDF and BSR bits.

Well, let’s actually run it next time.
If I’m wrong, I’ll investigate again then.

Conclusion.

BusMaster does not support CAN-FD.
The asc format of CAN-FD is different from CAN.
- FDF bit and BSR bit parameters are added.

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