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collin80 / SavvyCAN

QT based cross platform canbus tool
MIT License
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CAN-FD with differing speeds #687

Open walnut-engineering opened 8 months ago

walnut-engineering commented 8 months ago

Discussed in https://github.com/collin80/SavvyCAN/discussions/684

Originally posted by **tyalie** October 18, 2023 Is it possible to use SavvyCAN CAN-FD with different speeds for CAN and CAN-FD?

There is only a single setting for speed when choosing CAN-FD, but 500k/2M is a common standard now.. in Ubuntu you can set this outside the application but on Windows this is not possible. Even a config file with the speed configuration would be acceptable.

danjhunter commented 7 months ago

@walnut-engineering I need to view CAN-FD at 2Mbit/s. Right now on MacOS the max I can set it to is 1Mbit/s. Are you saying you are able to get speeds of 2Mbit/s on Ubuntu? If so how is this possible? @collin80 any idea how difficult it would be to expand beyond 1Mbit/s to higher speeds especially 2Mbit/s?

prajwaltr93 commented 7 months ago

@danjhunter i think you can set it on Linux using IP command, like so sudo ip link set dev can0 up type can bitrate 500000.

danjhunter commented 7 months ago

@prajwaltr93 would I not want to do sudo ip link set dev can1 up type can bitrate 2000000 ? If using Linux can I just do this change to a board I have already set firmware on via macOS? I guess using the ip link function?

danjhunter commented 7 months ago

I have been able to get this working using CoolTerm @ 1M Baud rate. I am able to set the rate on the board by pressing "h" help and confirming based on the supplied instructions. This displays a settings screen where you can change the parameters. One thing I have noticed is that CANFD frames are only able to display when they are 8 bytes in length. If they are longer I get an error, a bunch of repeating "" & "!" For message presumably at the 2M speed. I have disabled CAN0 and have CAN 1 set to CANFD at to 500000 and 2000000. I am able to see messages at 500000 but not at 2000000. I have tested this by changing the rate from 2 million down to 500,000. I get the same message stream. I think this probably tied to ESP32RET firmware build 618 not SavvyCAN but figured I would post here as well. If I try to connect to savvyCAN it will connect but due to all of the repeating ! & "errors" it will disconnect. @collin80 any idea why this might not be working at 2MBit/sec? Is this a firmware issue? Also can you point me to some documentation on the logging functions for the board? Is anyone else using the EVTVcandueV2 for CANFD?

gedass2000 commented 6 months ago

Do you use the PCAN hardware clone with PEAK libraries ?