Subversion Repositories gamepads

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

--

-- SNESpad controller core

--

-- $Id: snespad_pad.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 snespad_pad is

  generic (

    reset_level_g   :     natural := 0;

    button_level_g  :     natural := 0

  );

  port (

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

    clk_i           : in  std_logic;

    reset_i         : in  std_logic;

    clk_en_i        : in  boolean;

    -- Control Interface ------------------------------------------------------

    shift_buttons_i : in  boolean;

    save_buttons_i  : in  boolean;

    -- Pad Interface ----------------------------------------------------------

    pad_data_i      : in  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_start_o     : out std_logic;

    but_sel_o       : out std_logic;

    but_tl_o        : out std_logic;

    but_tr_o        : out std_logic;

    but_up_o        : out std_logic;

    but_down_o      : out std_logic;

    but_left_o      : out std_logic;

    but_right_o     : out std_logic

  );

end snespad_pad;

use work.snespad_pack.all;

architecture rtl of snespad_pad is

  signal buttons_q,

         shift_buttons_q : buttons_t;

begin

  -- pragma translate_off

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

  -- Check generics

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

  assert (reset_level_g = 0) or (reset_level_g = 1)

    report "reset_level_g must be either 0 or 1!"

    severity failure;

  assert (button_level_g = 0) or (button_level_g = 1)

    report "button_level_g must be either 0 or 1!"

    severity failure;

  -- pragma translate_on

  seq: process (reset_i, clk_i)

  begin

    if reset_i = reset_level_g then

      for i in buttons_t'range loop

        buttons_q(i)       <= button_reset_f(button_level_g);

        shift_buttons_q(i) <= button_reset_f(button_level_g);

      end loop;

    elsif clk_i'event and clk_i = '1' then

      if save_buttons_i then

        buttons_q <= shift_buttons_q;

      end if;

      if clk_en_i and shift_buttons_i then

        shift_buttons_q(buttons_t'high downto 1) <= shift_buttons_q(buttons_t'high-1 downto 0);

        shift_buttons_q(0)                       <= button_active_f(pad_data_i, button_level_g);

      end if;

    end if;

  end process;

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

  -- Output Mapping

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

  but_a_o     <= buttons_q(but_pos_a_c);

  but_b_o     <= buttons_q(but_pos_b_c);

  but_x_o     <= buttons_q(but_pos_x_c);

  but_y_o     <= buttons_q(but_pos_y_c);

  but_start_o <= buttons_q(but_pos_start_c);

  but_sel_o   <= buttons_q(but_pos_sel_c);

  but_tl_o    <= buttons_q(but_pos_tl_c);

  but_tr_o    <= buttons_q(but_pos_tr_c);

  but_up_o    <= buttons_q(but_pos_up_c);

  but_down_o  <= buttons_q(but_pos_down_c);

  but_left_o  <= buttons_q(but_pos_left_c);

  but_right_o <= buttons_q(but_pos_right_c);

end rtl;