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msadie, thanks for the idea, I'm looking at that. Turns out my Peak USB/CAN device can't do self ack unless I upgrade the firmware in it, so I'm looking at that and/or putting another teensy 4.1 on the can bus. Will report results so the group can benefit.

FlexCAN_T4 users and tonton81: I'm having some difficult with FlexCAN_T4 being able to reliably see CAN messages on the bus when it starts up. When there is traffic on the bus already as the Teensy 4.1 boots up, it sometimes can't receive it, as though the FlexCAN_T4 library didn't start up...

Mark you are spot on my friend, thank you. When I right click on an .ino file and choose Open With, there are two choices for Arduino. One of them opens a round icon Arduino which is the one installed at c:\program files (x86)\Arduino. The other one opens a square icon Arduino which is...

So replying to my own thread here, as it may help somebody else. In the situation I describe above, I double-clicked on my new project's .ino file to open it. I hit the Checkmark icon to build it, and it failed as described above. Then I realized that the Arduinio IDE appeared to have lost...

I've got a dumb question about using teensy libraries. I'm a fairly experienced embedded developer, but new to Arduinio and Teensy. My project is to use a Teensy 4.1 to receive some low bandwidth incoming UDP/IP data packets and convert to some other types of I/O. I've got Arduino 1.8.19 and...