Using ttyAMA0 as serial interface on raspberry3

device
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This is from some time ago now, but FWIW the approach that worked for me is as follows:

  • Add dtoverlay=pi3-miniuart-bt to config.txt to set Bluetooth to use ttyS0 rather than ttyAMA0.
  • Remove the console=serial0,115200 bit from cmdline.txt. This frees up the port to be used as an RS232 port rather than used for the console.

Mostly derived from https://spellfoundry.com/2016/05/29/configuring-gpio-serial-port-raspbian-jessie-including-pi-3-4/ (and targeted at Raspbian, but should be more or less equivalent for Ubuntu Core).

Hope that helps!