Add antenna diagnostics and selection (#22)

* Implement antenna detection

* Add get_rx_tx_ports function

* Add get_antenna_return_loss function

* Search on single antenna using current antenna config

* Bump to 0.5.0.

lib/tm_mercury/message.ex

@@ -65,6 +65,18 @@ defmodule TM.Mercury.Message do
     Map.put(msg, :data, TM.Mercury.Tag.Protocol.decode!(tag_protocol))
   end
 
+  def decode(%Message{opcode: :get_antenna_port, data: <<0x05, tail :: binary>>} = msg) do
+    # Antenna detection
+    ant_list = for <<ant, status <- tail>>, do: {ant, status}
+    Map.put(msg, :data, ant_list)
+  end
+
+  def decode(%Message{opcode: :get_antenna_port, data: <<0x06, tail :: binary>>} = msg) do
+    # Antenna return loss
+    ant_list = for <<ant, loss <- tail>>, do: {ant, loss}
+    Map.put(msg, :data, ant_list)
+  end
+
   def decode(%Message{opcode: :get_antenna_port} = msg) do
     <<tx :: uint8, rx :: uint8 >> = msg.data
     Map.put(msg, :data, {tx, rx})

lib/tm_mercury/protocol/command.ex

@@ -108,6 +108,10 @@ defmodule TM.Mercury.Protocol.Command do
     {:ok, Message.encode(code, <<2, ant :: binary>>)}
   end
 
+  defp build_command(_rdr, {:get_antenna_port, code}, [sub|[]]) do
+    {:ok, Message.encode(code, <<sub>>)}
+  end
+
   defp build_command(_rdr, {:get_reader_stats, code}, [option, flags]) do
     with {:ok, encoded_option} <- Stats.Option.encode(option),
          {:ok, encoded_flags}        <- Stats.Flag.encode(flags),

lib/tm_mercury/reader.ex

@@ -207,6 +207,28 @@ defmodule TM.Mercury.Reader do
     GenServer.call(pid, [:set_antenna_port, ports])
   end
 
+  @doc """
+  Enumerate the logical antenna ports and report the antenna
+  detection status of each one.
+  """
+  def detect_antennas(pid) do
+    GenServer.call(pid, [:get_antenna_port, 0x05])
+  end
+
+  @doc """
+  Return the current TX and RX antenna port.
+  """
+  def get_tx_rx_ports(pid) do
+    GenServer.call(pid, [:get_antenna_port, 0x00])
+  end
+
+  @doc """
+  Return the antenna return loss of logical antenna ports.
+  """
+  def get_antenna_return_loss(pid) do
+    GenServer.call(pid, [:get_antenna_port, 0x06])
+  end
+
   @doc """
   TODO
   """
@@ -601,7 +623,7 @@ defmodule TM.Mercury.Reader do
   end
 
   defp execute_read_sync(ts, rdr, timeout, rp) do
-    flags = [:configured_list, :large_tag_population_support]
+    flags = [:configured_antenna, :large_tag_population_support]
             |> add_flag(:fast_search, rp)
 
     try do

mix.exs

@@ -3,7 +3,7 @@ defmodule TM.Mercury.Mixfile do
 
   def project do
     [app: :tm_mercury,
-     version: "0.5.0-dev",
+     version: "0.5.0",
      elixir: "~> 1.4",
      build_embedded: Mix.env == :prod,
      start_permanent: Mix.env == :prod,