uart0 debug

Hello, I am debugging with uart0 now, but can only send and cannot receive.

Make sure flow control is off (no CTS/RTS).

Hello, I designed the baseboard myself.
I didn’t design the flow control signal, which is the NC signal. How do I turn it off.

Normally you just leave the CTS and RTS wires floating, but simply telling your serial console application to not use it should be enough. Is there any chance the CTS or RTS wires were left non-floating?