Hi
Using a AtMega2560 (Robotdyn Pro Mini)
USART Ports 0&1 are swapped around in FC7, 'Channel 2' is TX1,RX1 (pins D18 &D19) and Channel 1 is the inbuilt USB port ( usually port 0)
I have not tried the other ports.
I can confirm it works as expected in Atmel Studio 7 and Arduino IDE
BUG - USART Ports Swapped (Channel 1 & 2)
Moderator: Benj