Hello,
today my Rock Pi 4B+ arrived and played around with it. I enabled the two UART interfaces via the rsetup/overlays method. At both ports in can receive data but can not send data. This was tested by connecting the UART port to a USB-Serial converter. Also a simple loopback (connecting RX-TX) does not work.
When using the serial console on UART2 both directions worked. But I want to connect sensors to both UARTs, so I disabled the console on UART2 by removing the /dev/ttyS2 from /boot/extlinux/extlinux.conf .
My two questions are now:
Why can I not send data from the UARTs?
How can I completely disable the console output on UART2 (u-boot console)?
Thanks