I want to design an own PCB with an Atmega32U4 and two serial connections (UART).
I already tried to implement two software serial interfaces but I didn't work at all.
Currently my project (still on Arduino Uno/Atmega328p) is working fine with my current configuration (1 HW UART and 1 SW UART).
But as soon as I want to upload a new sketch I have to disconnect the RX pin on the Ardunio Uno in order to get the code uploaded.
Now my question is:
Is this issue also present on the Atmega32U4 and if yes, how to avoid this problem on my new PCB where I cannot simply disconnect the RX pin on the Atmega32U4?