Question about main UART

[halindrome]

In the RPi 3 you can switch the bt to the minuart with the pi3-miniuart-bt kernel dtoverlay. When you do this, the main uart is exposed on pins 8 and 10... and it maps to /dev/serial0. I guess my question is do we need to do anything to use this code to enable CTS / RTS on serial0 in this mode? Or does the remapping at the kernel level magically deal with this?

[jcwren]

You have to manage hardware flow control via an ioctl() call. You should never count on it being in a given state, as another program may have changed the mode and not restored the previous mode on exit.

See Serial Programming Guide for POSIX Operating Systems for a guide.

You can also use stty to manage the port's configuration.