Angelo

Could be interesting to know which application requires more than 3 canbus.

Check this thread and this post. I had the same problem and added the FLASHMEM attribute to all LVGL code. Definitely not a good way to do it. What looks strange to me, LVGL is succesfully used on ESP-32 which has less RAM. Is the code executed...

I read : we operate in a noise environment Are signals comming from outside filtered, protected, limited,... ? or are they directly connected to teensy pins ??? How is your electronics connected to earth ground ??? And the PC used to connect to...

Just my 2 cents, the learning curve of CANopen is long, slow and painfull. I tried to learn, in order to help a collegue on the SW part. I switched back to the pcb design. Unless you should implement slave nodes to an existing master, you could...

Is the Adafruit library able to handle 2 separate displays ??? May be it has some global variables. Try to connect only one display and make it work.

Using the debug library, debugging is also possible on Platformio. See https://forum.pjrc.com/index.php?threads/using-gdb-with-teensy-without-hardware-debugger-first-beta.61373/

Try PlatformIO.

No idea. As I said, try 1MHz. You have tracks too close to the big round holes. Machining these holes could touch these tracks depending on tolerances on everything: dimensions, positioning on the machine, tools used, and so on. And imagine you...

SPI works on short connections. On your picture above, it seems the display is connected on the right to the red pcb. And, if I am correct, the Teensy is connected on the left of the red pcb. It makes a "long" line. Try 1MHz or even lower.

Try much lower than 12MHz, just to confirm it is not related to speed. And also measure SPI signals with a scope, both on the teensy and on the display.

In the thread you mentioned, last post, KurtE suggested to lower the SPI frequency.

Ethernet ?

The newer, faster chips have in general worse performing analog sections. External DAC and ADC are becoming more necessary. I don't see those being fitted on a Teensy form factor (for space reasons, and to avoid tying up SPI buses, and to give...

I realise my question was not clear, and I corrected it in the first post and title. The right question is : are the Double handled by M7 core hardware by default ?

I use Float64 in a Teensy 4 GPS application to compute things like line crossing detection, distance measurements, and probably RTK in the future. I know the 600MHz is waaayyyy enough to compute the GPS 25Hz outputs, even unsing ieee library...

I also use 24 to 5V DC-DC to power Teensy and a GPS module. On the Teensy, don't forget to cut the trace on bottom face and put a small diode on the pads. Don't hesitate to put ferrites, 1nF, 10nF and/or 100nf capacitors (any combination) on...