@callback enumerate() :: [Circuits.GPIO.Line.t()]

Return a list of GPIOs

See the Line struct for the information that is returned.

@callback info() :: map()

Return information about this backend

@callback open(
  gpio_spec :: Circuits.GPIO.gpio_spec(),
  direction :: Circuits.GPIO.direction(),
  options :: Circuits.GPIO.open_options()
) :: {:ok, Circuits.GPIO.Handle.t()} | {:error, atom()}

Open one or more GPIOs

gpio_spec should be a valid GPIO pin specification on the system and direction should be :input or :output. If opening as an output, then be sure to set the :initial_value option if you need the set to be glitch free.

Options:

• :initial_value - Set to 0 or 1 if this is an output. 0 is the default.
• :pull_mode - Set to :not_set, :pullup, :pulldown, or :none for an input pin. :not_set is the default.