Add GPIO pull setting

lib/pigpiox/command.ex

@@ -4,6 +4,7 @@ defmodule Pigpiox.Command do
   @commands %{
     set_mode:               0,
     get_mode:               1,
+    set_pull:               2,
     gpio_read:              3,
     gpio_write:             4,
     set_servo_pulsewidth:   8,

lib/pigpiox/gpio.ex

@@ -12,6 +12,13 @@ defmodule Pigpiox.GPIO do
 	@gpio_modes Map.keys(@gpio_modes_map)
 	@inverted_gpio_modes_map for {key, val} <- @gpio_modes_map, into: %{}, do: {val, key}
 
+  @gpio_pull_map %{
+    off: 0,
+    down: 1,
+    up: 2
+  }
+  @gpio_pull Map.keys(@gpio_pull_map)
+
   @moduledoc """
   This module exposes pigpiod's basic GPIO functionality.
   """
@@ -21,6 +28,11 @@ defmodule Pigpiox.GPIO do
   """
   @type mode :: :input | :output | :alt0 | :alt1 | :alt2 | :alt3 | :alt4 | :alt5
 
+  @typedoc """
+  GPIO pull settings, for `set_pull/2`
+  """
+  @type pull :: :up | :down | :off
+
   @typedoc """
   The state of a GPIO pin - 0 for low, 1 for high.
   """
@@ -51,6 +63,20 @@ defmodule Pigpiox.GPIO do
     end
 	end
 
+  @doc """
+  Sets a pull for a specific GPIO `pin`. `pin` must be a valid GPIO pin number for the device, with some exceptions.
+  See pigpio's [documentation](http://abyz.co.uk/rpi/pigpio/index.html) for more details.
+
+  `pull` can be any of `t:pull/0`.
+  """
+  @spec set_pull(pin :: integer, pull) :: :ok | {:error, atom}
+  def set_pull(pin, pull) when pull in @gpio_pull do
+    case Pigpiox.Socket.command(:set_pull, pin, @gpio_pull_map[pull]) do
+      {:ok, _} -> :ok
+      error -> error
+    end
+  end
+
   @doc """
   Returns the current level for a specific GPIO `pin`
   """

mix.exs

@@ -4,7 +4,7 @@ defmodule Pigpiox.Mixfile do
   def project do
     [
       app: :pigpiox,
-      version: "0.1.2",
+      version: "0.1.3",
       elixir: "~> 1.5",
       build_embedded: Mix.env == :prod,
       start_permanent: Mix.env == :prod,