![[CAN-FD] Vehicle Diagnostic Communication Part 95 [ISO-TP 3]](https://www.simulationroom999.com/blog/wp-content/uploads/2023/01/01_eyecatch-19.png)
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https://www.simulationroom999.com/blog/diagnostic-communication-en-back-issue/
Introduction.
Check the CAN-FD simulation results in can-isotp.
This article will focus on SingleFrame and FirstFrame.
The explanation will be given while looking at the logs on the actual CAN-FD line.
Simulation results
The log on the CAN line after the simulation looks like this.
Long messages are omitted.
Begin Triggerblock
0.000000 Start of measurement
0.000000 1 18DA10F1x Rx d 8 07 01 02 03 04 05 06 07
0.014868 1 18DAF110x Rx d 8 07 01 02 03 04 05 06 07
0.203358 1 18DA10F1x Rx d 64 00 3C 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 55 55
0.222282 1 18DAF110x Rx d 8 07 01 02 03 04 05 06 07
0.404857 1 18DA10F1x Rx d 64 10 78 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02
0.421732 1 18DAF110x Rx d 8 30 00 00 CC CC CC CC CC
0.422724 1 18DA10F1x Rx d 64 21 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 55 55 55 55 55
0.448758 1 18DAF110x Rx d 8 07 01 02 03 04 05 06 07
0.609231 1 18DA10F1x Rx d 64 10 00 00 00 13 88 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08
0.611156 1 18DAF110x Rx d 8 30 00 00 CC CC CC CC CC
0.612213 1 18DA10F1x Rx d 64 21 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01
/*omission*/
03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09
0.618979 1 18DA10F1x Rx d 64 2E 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02
0.619053 1 18DA10F1x Rx d 32 2F 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 55 55 55
0.651149 1 18DAF110x Rx d 8 07 01 02 03 04 05 06 07
End TriggerBlockSingleFrame Explanation
SingleFrame of 7 bytes or less is the same as before.
0.000000 1 18DA10F1x Rx d 8 07 01 02 03 04 05 06 07And for SingleFrames of 8 bytes or more, the specification is that the first line is 0x00 and the next 0x3C = 60 [bytes] is Length, which is exactly what it is.
0.203358 1 18DA10F1x Rx d 64 00 3C 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 55 55
FirstFrame Explanation
The conventional FirstFrame of 4095 bytes or less is the following nibble of the first byte and the second byte is Length.
0.404857 1 18DA10F1x Rx d 64 10 78 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02
For FirstFrame exceeding 4096 bytes, the following nibble of the first byte and the second byte are 0x000, and the 4 bytes after that are Length.
In this case, 0x1388=5000[byte] corresponds to this.
0.609231 1 18DA10F1x Rx d 64 10 00 00 00 13 88 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08 09 10 01 02 03 04 05 06 07 08
Now that we have confirmed that can-isotp is capable of CAN-FD diagnostic communication, the next step is to consider how to deal with AUTOSAR-DCM.
Conclusion
- CAN line logged.
- Checked SingleFrame.
- SingleFrame of 7 bytes or less.
- SingleFrame with more than 8 bytes.
- FirstFrame check.
- FirstFrame of 4095 bytes or less.
- FirstFrame with 4096 bytes or more.
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