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circuits_i2c

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circuits_i2c lib i2c i2c_nif.ex
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lib/i2c/i2c_nif.ex 

defmodule Circuits.I2C.Nif do

  @moduledoc false



  defp load_nif_and_apply(fun, args) do

    nif_binary = Application.app_dir(:circuits_i2c, "priv/i2c_nif")



    # Optimistically load the NIF. Handle the possible race.

    case :erlang.load_nif(to_charlist(nif_binary), 0) do

      :ok -> apply(__MODULE__, fun, args)

      {:error, {:reload, _}} -> apply(__MODULE__, fun, args)

      error -> error

    end

  end



  def open(device) do

    load_nif_and_apply(:open, [device])

  end



  def read(_ref, _address, _count, _retries), do: :erlang.nif_error(:nif_not_loaded)

  def write(_ref, _address, _data, _retries), do: :erlang.nif_error(:nif_not_loaded)



  def write_read(_ref, _address, _write_data, _read_count, _retries),

    do: :erlang.nif_error(:nif_not_loaded)



  def close(_ref), do: :erlang.nif_error(:nif_not_loaded)



  def info() do

    load_nif_and_apply(:info, [])

  end

end