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-------------------------------------------------------------------------------

--

-- GCpad controller core

--

-- $Id: gcpad_basic.vhd 41 2009-04-01 19:58:04Z arniml $

--

-- Copyright (c) 2004, Arnim Laeuger (arniml@opencores.org)

--

-- All rights reserved

--

-- Redistribution and use in source and synthezised forms, with or without

-- modification, are permitted provided that the following conditions are met:

--

-- Redistributions of source code must retain the above copyright notice,

-- this list of conditions and the following disclaimer.

--

-- Redistributions in synthesized form must reproduce the above copyright

-- notice, this list of conditions and the following disclaimer in the

-- documentation and/or other materials provided with the distribution.

--

-- Neither the name of the author nor the names of other contributors may

-- be used to endorse or promote products derived from this software without

-- specific prior written permission.

--

-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE

-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

-- POSSIBILITY OF SUCH DAMAGE.

--

-- Please report bugs to the author, but before you do so, please

-- make sure that this is not a derivative work and that

-- you have the latest version of this file.

--

-- The latest version of this file can be found at:

--      http://www.opencores.org/cvsweb.shtml/gamepads/

--

-- The project homepage is located at:

--      http://www.opencores.org/projects.cgi/web/gamepads/overview

--

-------------------------------------------------------------------------------

library ieee;

use ieee.std_logic_1164.all;

entity gcpad_basic is

  generic (

    -- active level of reset_i

    reset_level_g    :       integer := 0;

    -- number of clk_i periods during 1us

    clocks_per_1us_g :       integer := 2

  );

  port (

    -- System Interface -------------------------------------------------------

    clk_i            : in    std_logic;

    reset_i          : in    std_logic;

    pad_request_i    : in    std_logic;

    pad_avail_o      : out   std_logic;

    -- Gamepad Interface ------------------------------------------------------

    pad_data_io      : inout std_logic;

    -- Buttons Interface ------------------------------------------------------

    but_a_o          : out   std_logic;

    but_b_o          : out   std_logic;

    but_x_o          : out   std_logic;

    but_y_o          : out   std_logic;

    but_z_o          : out   std_logic;

    but_start_o      : out   std_logic;

    but_tl_o         : out   std_logic;

    but_tr_o         : out   std_logic;

    but_left_o       : out   std_logic;

    but_right_o      : out   std_logic;

    but_up_o         : out   std_logic;

    but_down_o       : out   std_logic;

    ana_joy_x_o      : out   std_logic_vector(7 downto 0);

    ana_joy_y_o      : out   std_logic_vector(7 downto 0);

    ana_c_x_o        : out   std_logic_vector(7 downto 0);

    ana_c_y_o        : out   std_logic_vector(7 downto 0);

    ana_l_o          : out   std_logic_vector(7 downto 0);

    ana_r_o          : out   std_logic_vector(7 downto 0)

  );

end gcpad_basic;

use work.gcpad_pack.all;

architecture struct of gcpad_basic is

  component gcpad_ctrl

    generic (

      reset_level_g :     integer := 0

    );

    port (

      clk_i         : in  std_logic;

      reset_i       : in  std_logic;

      pad_request_i : in  std_logic;

      pad_avail_o   : out std_logic;

      rx_timeout_o  : out std_logic;

      tx_start_o    : out boolean;

      tx_finished_i : in  boolean;

      rx_en_o       : out boolean;

      rx_done_i     : in  boolean;

      rx_data_ok_i  : in  boolean

    );

  end component;

  component gcpad_tx

    generic (

      reset_level_g    :     natural := 0;

      clocks_per_1us_g :     natural := 2

    );

    port (

      clk_i            : in  std_logic;

      reset_i          : in  std_logic;

      pad_data_o       : out std_logic;

      tx_start_i       : in  boolean;

      tx_finished_o    : out boolean;

      tx_size_i        : in  std_logic_vector( 1 downto 0);

      tx_command_i     : in  std_logic_vector(23 downto 0)

    );

  end component;

  component gcpad_rx

    generic (

      reset_level_g    :     integer := 0;

      clocks_per_1us_g :     integer := 2

    );

    port (

      clk_i            : in  std_logic;

      reset_i          : in  std_logic;

      rx_en_i          : in  boolean;

      rx_done_o        : out boolean;

      rx_data_ok_o     : out boolean;

      rx_size_i        : in  std_logic_vector(3 downto 0);

      pad_data_i       : in  std_logic;

      rx_data_o        : out buttons_t

    );

  end component;

  -----------------------------------------------------------------------------

  -- constants for standard status polling

  constant rx_size_c    : std_logic_vector( 3 downto 0) := "1000";

  signal   rx_size_s    : std_logic_vector( 3 downto 0);

  --

  constant tx_size_c    : std_logic_vector( 1 downto 0) := "11";

  signal   tx_size_s    : std_logic_vector( 1 downto 0);

  --

  constant tx_command_c : std_logic_vector(23 downto 0) := "010000000000001100000010";

  signal   tx_command_s : std_logic_vector(23 downto 0);

  --

  -----------------------------------------------------------------------------

  signal pad_data_tx_s : std_logic;

  signal tx_start_s    : boolean;

  signal tx_finished_s : boolean;

  signal rx_en_s,

         rx_done_s,

         rx_data_ok_s : boolean;

  signal rx_data_s : buttons_t;

begin

  rx_size_s    <= rx_size_c;

  tx_size_s    <= tx_size_c;

  tx_command_s <= tx_command_c;

  ctrl_b : gcpad_ctrl

    generic map (

      reset_level_g => reset_level_g

    )

    port map (

      clk_i         => clk_i,

      reset_i       => reset_i,

      pad_request_i => pad_request_i,

      pad_avail_o   => pad_avail_o,

      rx_timeout_o  => open,

      tx_start_o    => tx_start_s,

      tx_finished_i => tx_finished_s,

      rx_en_o       => rx_en_s,

      rx_done_i     => rx_done_s,

      rx_data_ok_i  => rx_data_ok_s

    );

  tx_b : gcpad_tx

    generic map (

      reset_level_g    => reset_level_g,

      clocks_per_1us_g => clocks_per_1us_g

    )

    port map (

      clk_i            => clk_i,

      reset_i          => reset_i,

      pad_data_o       => pad_data_tx_s,

      tx_start_i       => tx_start_s,

      tx_finished_o    => tx_finished_s,

      tx_size_i        => tx_size_s,

      tx_command_i     => tx_command_s

    );

  rx_b : gcpad_rx

    generic map (

      reset_level_g    => reset_level_g,

      clocks_per_1us_g => clocks_per_1us_g

    )

    port map (

      clk_i            => clk_i,

      reset_i          => reset_i,

      rx_en_i          => rx_en_s,

      rx_done_o        => rx_done_s,

      rx_data_ok_o     => rx_data_ok_s,

      rx_size_i        => rx_size_s,

      pad_data_i       => pad_data_io,

      rx_data_o        => rx_data_s

  );

  -----------------------------------------------------------------------------

  -- Open collector driver to pad data

  -----------------------------------------------------------------------------

  pad_data_io <=   '0'

                 when pad_data_tx_s = '0' else

                   'Z';

  -----------------------------------------------------------------------------

  -- Output mapping

  -----------------------------------------------------------------------------

  but_a_o     <= rx_data_s(pos_a_c);

  but_b_o     <= rx_data_s(pos_b_c);

  but_x_o     <= rx_data_s(pos_x_c);

  but_y_o     <= rx_data_s(pos_y_c);

  but_z_o     <= rx_data_s(pos_z_c);

  but_start_o <= rx_data_s(pos_start_c);

  but_tl_o    <= rx_data_s(pos_tl_c);

  but_tr_o    <= rx_data_s(pos_tr_c);

  but_left_o  <= rx_data_s(pos_left_c);

  but_right_o <= rx_data_s(pos_right_c);

  but_up_o    <= rx_data_s(pos_up_c);

  but_down_o  <= rx_data_s(pos_down_c);

  ana_joy_x_o <= rx_data_s(joy_x_high_c downto joy_x_low_c);

  ana_joy_y_o <= rx_data_s(joy_y_high_c downto joy_y_low_c);

  ana_c_x_o   <= rx_data_s(c_x_high_c   downto c_x_low_c);

  ana_c_y_o   <= rx_data_s(c_y_high_c   downto c_y_low_c);

  ana_l_o     <= rx_data_s(l_high_c     downto l_low_c);

  ana_r_o     <= rx_data_s(r_high_c     downto r_low_c);

end struct;