Auxiliary GPIO Control

[Poofjunior]

From Harp (via Registers) we will need to be able to control 8 exposed GPIO pins:

We will need to be able to set their:

• direction
  • input or output
• state
  • write to this register to control the state of all GPIOs (on or off) at once.
• set
  • 1s written to this register will turn ON the corresponding GPIO
• clear
  • 1s written to this register will turn OFF the corresponding GPIO

[Poofjunior]

Drafted in #4