Subversion Repositories gamepads

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--

-- Testbench for the

-- GCpad controller core

--

-- $Id: tb.vhd,v 1.1 2004-10-07 21:24:06 arniml Exp $

--

-- 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 tb is

end tb;

use work.gcpad_pack.all;

architecture behav of tb is

  constant period_c         : time    := 100 ns;

  constant reset_level_c    : natural := 0;

  constant clocks_per_1us_c : natural := 10;

  component gcpad_basic

    generic (

      reset_level_g    :       integer := 0;

      clocks_per_1us_g :       integer := 2

    );

    port (

      clk_i            : in    std_logic;

      reset_i          : in    std_logic;

      pad_request_i    : in    std_logic;

      pad_avail_o      : out   std_logic;

      pad_data_io      : inout std_logic;

      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 component;

  signal clk_s   : std_logic;

  signal reset_s : std_logic;

  signal pad_data_s : std_logic;

  signal buttons_s : std_logic_vector(64 downto 0);

  signal pad_request_s : std_logic;

  signal pad_avail_s   : std_logic;

begin

  basic_b : gcpad_basic

    generic map (

      reset_level_g    => reset_level_c,

      clocks_per_1us_g => clocks_per_1us_c

    )

    port map (

      clk_i          => clk_s,

      reset_i        => reset_s,

      pad_request_i  => pad_request_s,

      pad_avail_o    => pad_avail_s,

      pad_data_io    => pad_data_s,

      but_a_o        => buttons_s(56),

      but_b_o        => buttons_s(57),

      but_x_o        => buttons_s(58),

      but_y_o        => buttons_s(59),

      but_z_o        => buttons_s(52),

      but_start_o    => buttons_s(60),

      but_tl_o       => buttons_s(54),

      but_tr_o       => buttons_s(53),

      but_left_o     => buttons_s(48),

      but_right_o    => buttons_s(49),

      but_up_o       => buttons_s(51),

      but_down_o     => buttons_s(50),

      ana_joy_x_o    => buttons_s(47 downto 40),

      ana_joy_y_o    => buttons_s(39 downto 32),

      ana_c_x_o      => buttons_s(31 downto 24),

      ana_c_y_o      => buttons_s(23 downto 16),

      ana_l_o        => buttons_s(15 downto  8),

      ana_r_o        => buttons_s( 7 downto  0)

    );

  buttons_s(64)           <= '0';

  buttons_s(63 downto 61) <= (others => '0');

  buttons_s(55)           <= '1';

  -- pullup on pad_data

--  pad_data_s <= 'H';

  stimuli: process

    procedure check_request is

      constant request_c : std_logic_vector(24 downto 0) := "H0H000000HH000000000000H0";

    begin

      -- read 25 bits from pad_data_s

      for i in 0 to 24 loop

        wait until pad_data_s = '0';

        wait for 2 * clocks_per_1us_c * period_c;

        if pad_data_s /= request_c(i) then

          assert false

            report "Found wrong level on pad_data_s while checking request packet!"

            severity error;

        end if;

        wait for 2 * clocks_per_1us_c * period_c;

      end loop;

    end check_request;

    procedure send_packet(packet : in std_logic_vector(64 downto 0)) is

      variable time_low_v, time_high_v : time;

    begin

      -- send request;

      pad_request_s <= '1';

      wait for 1 * period_c;

      pad_request_s <= '0';

      check_request;

      wait for 10 * 40 * period_c;

      for i in packet'high downto 0 loop

        if packet(i) = '0' then

          time_low_v  := 3 us;

          time_high_v := 1 us;

        else

          time_low_v  := 1 us;

          time_high_v := 3 us;

        end if;

        pad_data_s <= '0';

        wait for time_low_v;

        pad_data_s <= 'H';

        wait for time_high_v;

      end loop;

      wait until pad_avail_s = '1';

      wait for 10 * period_c;

      -- check result

      for i in 1 to packet'high loop

        assert packet(i) = buttons_s(i-1)

          report "Button mismatch!"

          severity error;

      end loop;

    end send_packet;

    procedure timeout_gcpad is

    begin

      -- send request;

      pad_request_s <= '1';

      wait for 1 * period_c;

      pad_request_s <= '0';

      check_request;

      wait until pad_avail_s = '1';

      wait for 10 * period_c;

    end timeout_gcpad;

  begin

    pad_data_s    <= 'H';

    pad_request_s <= '0';

    wait until reset_s = '1';

    wait for period_c * 4;

    timeout_gcpad;

    send_packet(packet => "00000000100000000000000000000000000000000000000000000000000000001");

    wait for clocks_per_1us_c * 100 * period_c;

    send_packet(packet => "00011111111111111111111111111111111111111111111111111111111111111");

    send_packet(packet => "00010000100000000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00001000100000000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000100100000000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000010100000000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000001100000000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00001010101010101010101010101010101010101010101010101010101010101");

    send_packet(packet => "00010101110101010101010101010101010101010101010101010101010101011");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000110000000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000101000000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100100000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100010000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100001000000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000100000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000010000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000001000000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000100000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000010000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000001000000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000100000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000010000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000001000000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000100000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000010000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000001000000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000100000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000010000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000001000000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000100000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000010000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000001000000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000100000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000010000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000001000000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000100000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000010000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000001000000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000100000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000010000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000001000000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000100000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000010000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000001000000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000100000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000010000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000001000000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000100000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000010000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000001000000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000100000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000010000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000001000000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000100000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000010000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000001000000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000000100000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000000010000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000000001000001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000000000100001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000000000010001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000000000001001");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000000000000101");

    send_packet(packet => "00000000100000000000000000000000000000000000000000000000000000011");

    wait for period_c * 2*40;

    assert false

      report "End of simulation reached."

      severity failure;

  end process stimuli;

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

  -- Clock Generator

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

  clk: process

  begin

    clk_s <= '0';

    wait for period_c / 2;

    clk_s <= '1';

    wait for period_c / 2;

  end process clk;

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

  -- Reset Generator

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

  reset: process

  begin

    if reset_level_c = 0 then

      reset_s <= '0';

    else

      reset_s <= '1';

    end if;

    wait for period_c * 4 + 10 ns;

    reset_s <= not reset_s;

    wait;

  end process reset;

end behav;

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