Arduino MKR 1010 WiFi UART interface issues

Official Hardware MKR Family MKR WiFi 1010
1

Hello Folks,
I am building a device to monitor and control the charging process of a battery via CAN Bus.
The hardware involved is:

  • Arduino MKR 1010 WiFi
  • Arduino MKR CAN Shield
  • 4D Systems uLCD-43PT (Picaso)

Given that the CAN shield communicates with Arduino via the SPI interface, I need to control the LCD via UART (TX/RX pins).
My problem is that whenever I plug the display into those pins, the Arduino freezes.
Even with external power and no USB connection to PC the Arduino just stops working when I connect the display.

What could that be?
Do you have any suggestion? Maybe using another communication protocol with the LCD?
Thanks a lot in advance!

Have a marvellous day!

2

NINA module is on Serial1, so you can't use the RX/TX pins (a very strange flaw in 1010 design in my opinion)
create additional Serial on some other pins