Raspbian Jessie – Enable ttyAMA0

I spent a bit of time trying to find out how to enable the gpio port /dev/ttyAMA0.

1. In terminal

   sudo raspi-config
   

2. Select 9 Advanced Options
3. Select A7 Serial
4. Select No for: Would you like a login shell to be accessible over serial?
5. reboot
6. Enable uart in /boot/config.txt
7. reboot
8. Done

to check tty:

dmesg | grep tty

Use command-line gpio util to check state of all pins

gpio readall