repo2/aeon_lite/nes_gamepad.vhd @ 1475
| 149 | markw | ---------------------------------------------------------------------------
|
|
-- NES-Controller Module
|
|||
---------------------------------------------------------------------------
|
|||
-- This file is a part of "Aeon Lite" project
|
|||
-- Dmitriy Schapotschkin aka ILoveSpeccy '2014
|
|||
-- ilovespeccy@speccyland.net
|
|||
-- Project homepage: www.speccyland.net
|
|||
---------------------------------------------------------------------------
|
|||
library IEEE;
|
|||
use IEEE.STD_LOGIC_1164.ALL;
|
|||
use IEEE.NUMERIC_STD.ALL;
|
|||
------------------
|
|||
-- Bit - Button --
|
|||
-- (1 = pressed)
|
|||
------------------
|
|||
-- 7 A
|
|||
-- 6 B
|
|||
-- 5 Select
|
|||
-- 4 Start
|
|||
-- 3 Up
|
|||
-- 2 Down
|
|||
-- 1 Left
|
|||
-- 0 Right
|
|||
------------------
|
|||
entity nes_gamepad is
|
|||
generic (
|
|||
CLK_FREQ : integer := 25000000;
|
|||
TICK_FREQ : integer := 20000 );
|
|||
port (
|
|||
CLK : in std_logic;
|
|||
RESET : in std_logic;
|
|||
JOY_CLK : out std_logic;
|
|||
JOY_LOAD : out std_logic;
|
|||
JOY_DATA0 : in std_logic;
|
|||
JOY_DATA1 : in std_logic;
|
|||
JOY0_BUTTONS : out std_logic_vector(7 downto 0);
|
|||
JOY1_BUTTONS : out std_logic_vector(7 downto 0);
|
|||
JOY0_CONNECTED : out std_logic; -- 1 when gamepad connected
|
|||
JOY1_CONNECTED : out std_logic );
|
|||
end nes_gamepad;
|
|||
architecture RTL of nes_gamepad is
|
|||
signal TICK : integer range 0 to (CLK_FREQ / TICK_FREQ);
|
|||
signal STATE : integer range 0 to 17;
|
|||
signal DATA0 : std_logic_vector(7 downto 0);
|
|||
signal DATA1 : std_logic_vector(7 downto 0);
|
|||
begin
|
|||
process (CLK)
|
|||
begin
|
|||
if rising_edge(CLK) then
|
|||
if RESET = '1' then
|
|||
STATE <= 0;
|
|||
JOY_CLK <= '0';
|
|||
JOY_LOAD <= '0';
|
|||
TICK <= 0;
|
|||
JOY0_BUTTONS <= "00000000";
|
|||
JOY0_BUTTONS <= "00000000";
|
|||
JOY0_CONNECTED <= '0';
|
|||
JOY1_CONNECTED <= '0';
|
|||
else
|
|||
TICK <= TICK + 1;
|
|||
if TICK = (CLK_FREQ / TICK_FREQ) then
|
|||
TICK <= 0;
|
|||
STATE <= STATE + 1;
|
|||
case STATE is
|
|||
when 0 =>
|
|||
JOY_LOAD <= '1';
|
|||
when 1 =>
|
|||
JOY_LOAD <= '0';
|
|||
DATA0(7) <= JOY_DATA0;
|
|||
DATA1(7) <= JOY_DATA1;
|
|||
when 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 =>
|
|||
JOY_CLK <= '1';
|
|||
when 3 =>
|
|||
JOY_CLK <= '0';
|
|||
DATA0(6) <= JOY_DATA0;
|
|||
DATA1(6) <= JOY_DATA1;
|
|||
when 5 =>
|
|||
JOY_CLK <= '0';
|
|||
DATA0(5) <= JOY_DATA0;
|
|||
DATA1(5) <= JOY_DATA1;
|
|||
when 7 =>
|
|||
JOY_CLK <= '0';
|
|||
DATA0(4) <= JOY_DATA0;
|
|||
DATA1(4) <= JOY_DATA1;
|
|||
when 9 =>
|
|||
JOY_CLK <= '0';
|
|||
DATA0(3) <= JOY_DATA0;
|
|||
DATA1(3) <= JOY_DATA1;
|
|||
when 11 =>
|
|||
JOY_CLK <= '0';
|
|||
DATA0(2) <= JOY_DATA0;
|
|||
DATA1(2) <= JOY_DATA1;
|
|||
when 13 =>
|
|||
JOY_CLK <= '0';
|
|||
DATA0(1) <= JOY_DATA0;
|
|||
DATA1(1) <= JOY_DATA1;
|
|||
when 15 =>
|
|||
JOY_CLK <= '0';
|
|||
DATA0(0) <= JOY_DATA0;
|
|||
DATA1(0) <= JOY_DATA1;
|
|||
when 17 =>
|
|||
JOY_CLK <= '0';
|
|||
JOY0_BUTTONS <= "00000000";
|
|||
JOY1_BUTTONS <= "00000000";
|
|||
JOY0_CONNECTED <= '0';
|
|||
JOY1_CONNECTED <= '0';
|
|||
STATE <= 0;
|
|||
if DATA0 /= "00000000" then -- gamepad connected
|
|||
JOY0_BUTTONS <= not DATA0;
|
|||
JOY0_CONNECTED <= '1';
|
|||
end if;
|
|||
if DATA1 /= "00000000" then -- gamepad connected
|
|||
JOY1_BUTTONS <= not DATA1;
|
|||
JOY1_CONNECTED <= '1';
|
|||
end if;
|
|||
when OTHERS =>
|
|||
NULL;
|
|||
end case;
|
|||
end if;
|
|||
end if;
|
|||
end if;
|
|||
end process;
|
|||
end RTL;
|