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keyboard.vhd
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-------------------------------------------------------------------------------
--
-- PS/2 Keyboard interface for the Apple //e
-- Szombathelyi György
--
-- Based on
-- PS/2 Keyboard interface for the Apple ][
--
-- Stephen A. Edwards, sedwards@cs.columbia.edu
-- After an original by Alex Freed
--
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity keyboard is
port (
PS2_Clk : in std_logic; -- From PS/2 port
PS2_Data : in std_logic; -- From PS/2 port
CLK_14M : in std_logic;
reads : in std_logic; -- Read strobe
reset : in std_logic;
akd : buffer std_logic; -- Any key down
K : out unsigned(7 downto 0);-- Latched, decoded keyboard data
open_apple : out std_logic;
closed_apple : out std_logic
);
end keyboard;
architecture rtl of keyboard is
signal rom_addr : std_logic_vector(10 downto 0);
signal rom_out : unsigned(7 downto 0);
signal junction_code : std_logic_vector(7 downto 0);
signal code, latched_code : unsigned(7 downto 0);
signal ext, latched_ext : std_logic;
signal code_available : std_logic;
signal key_pressed : std_logic; -- Key pressed & not read
signal ctrl,shift,caplock : std_logic;
signal rep_timer : unsigned(22 downto 0);
-- Special PS/2 keyboard codes
constant KEY_UP_CODE : unsigned(7 downto 0) := X"F0";
constant EXTENDED_CODE : unsigned(7 downto 0) := X"E0";
constant LEFT_SHIFT : unsigned(7 downto 0) := X"12";
constant RIGHT_SHIFT : unsigned(7 downto 0) := X"59";
constant LEFT_CTRL : unsigned(7 downto 0) := X"14";
constant CAPS_LOCK : unsigned(7 downto 0) := X"58";
constant ALT : unsigned(7 downto 0) := X"11";
type states is (IDLE,
HAVE_CODE,
DECODE,
EXTENDED_KEY,
GOT_KEY_UP_CODE,
GOT_KEY_UP2,
GOT_KEY_UP3,
KEY_UP,
NORMAL_KEY,
KEY_READY1,
KEY_READY
);
signal state, next_state : states;
component spram
generic (
addrbits : integer;
databits : integer;
init_file : string
);
port (
address : in STD_LOGIC_VECTOR (addrbits-1 downto 0);
clock : in STD_LOGIC;
data : in STD_LOGIC_VECTOR (databits-1 downto 0);
wren : in STD_LOGIC;
q : out STD_LOGIC_VECTOR (databits-1 downto 0)
);
end component;
begin
keyboard_rom : spram
generic map (11,8,"../roms/keyboard.mif")
port map (
address => std_logic_vector(rom_addr),
clock => CLK_14M,
data => (others=>'0'),
wren => '0',
unsigned(q) => rom_out);
ps2_controller : entity work.PS2_Ctrl port map (
Clk => CLK_14M,
Reset => reset,
PS2_Clk => PS2_Clk,
PS2_Data => PS2_Data,
DoRead => code_available,
Scan_DAV => code_available,
Scan_Code => code);
K <= key_pressed & rom_out(6 downto 0);
caplock_ctrl : process (CLK_14M, reset)
begin
if reset = '1' then
caplock <= '0';
elsif rising_edge(CLK_14M) then
if state = KEY_UP and code = CAPS_LOCK then
caplock <= not caplock;
end if;
end if;
end process;
shift_ctrl : process (CLK_14M, reset)
begin
if reset = '1' then
shift <= '0';
ctrl <= '0';
elsif rising_edge(CLK_14M) then
if state = HAVE_CODE then
if code = LEFT_SHIFT or code = RIGHT_SHIFT then
shift <= '1';
elsif code = LEFT_CTRL then
ctrl <= '1';
elsif code = ALT then
if ext = '1' then closed_apple <= '1'; else open_apple <= '1'; end if;
end if;
elsif state = KEY_UP then
if code = LEFT_SHIFT or code = RIGHT_SHIFT then
shift <= '0';
elsif code = LEFT_CTRL then
ctrl <= '0';
elsif code = ALT then
if ext = '1' then closed_apple <= '0'; else open_apple <= '0'; end if;
end if;
end if;
end if;
end process shift_ctrl;
fsm : process (CLK_14M, reset)
begin
if reset = '1' then
state <= IDLE;
latched_code <= (others => '0');
ext <= '0';
latched_ext <= '0';
key_pressed <= '0';
elsif rising_edge(CLK_14M) then
state <= next_state;
if reads = '1' then key_pressed <= '0'; end if;
if state = KEY_UP or state = KEY_READY then
ext <= '0';
end if;
if state = GOT_KEY_UP_CODE then
akd <= '0';
end if;
if state = EXTENDED_KEY then
ext <= '1';
end if;
if state = NORMAL_KEY then
-- set up keyboard ROM read address
latched_code <= code ;
latched_ext <= ext;
end if;
if state = KEY_READY and junction_code /= x"FF" then
-- key code ready from ROM
akd <= '1';
key_pressed <= '1';
rep_timer <= to_unsigned(7000000, 23); -- 0.5s
end if;
if akd = '1' then
rep_timer <= rep_timer - 1;
if rep_timer = 0 then
rep_timer <= to_unsigned(933333, 23); -- 1/15s
key_pressed <= '1';
end if;
end if;
end if;
end process fsm;
fsm_next_state : process (code, code_available, state)
begin
next_state <= state;
case state is
when IDLE =>
if code_available = '1' then next_state <= HAVE_CODE; end if;
when HAVE_CODE =>
next_state <= DECODE;
when DECODE =>
if code = KEY_UP_CODE then
next_state <= GOT_KEY_UP_CODE;
elsif code = EXTENDED_CODE then
next_state <= EXTENDED_KEY;
elsif code = LEFT_SHIFT or code = RIGHT_SHIFT or code = LEFT_CTRL or code = CAPS_LOCK then
next_state <= IDLE;
else
next_state <= NORMAL_KEY;
end if;
when EXTENDED_KEY =>
next_state <= IDLE;
when GOT_KEY_UP_CODE =>
next_state <= GOT_KEY_UP2;
when GOT_KEY_UP2 =>
next_state <= GOT_KEY_UP3;
when GOT_KEY_UP3 =>
if code_available = '1' then
next_state <= KEY_UP;
end if;
when KEY_UP =>
next_state <= IDLE;
when NORMAL_KEY =>
next_state <= KEY_READY1;
when KEY_READY1 =>
next_state <= KEY_READY;
when KEY_READY =>
next_state <= IDLE;
end case;
end process fsm_next_state;
-- PS/2 scancode to Keyboard ROM address translation
rom_addr <= '0' & caplock & junction_code(6 downto 0) & not ctrl & not shift;
with latched_ext & latched_code select
junction_code <=
X"00" when '0'&X"76", -- Escape ("esc" key)
X"01" when '0'&X"16", -- 1
X"02" when '0'&X"1e", -- 2
X"03" when '0'&X"26", -- 3
X"04" when '0'&X"25", -- 4
X"05" when '0'&X"36", -- 6
X"06" when '0'&X"2e", -- 5
X"07" when '0'&X"3d", -- 7
X"08" when '0'&X"3e", -- 8
X"09" when '0'&X"46", -- 9
X"0A" when '0'&X"0d", -- Horizontal Tab
X"0B" when '0'&X"15", -- Q
X"0C" when '0'&X"1d", -- W
X"0D" when '0'&X"24", -- E
X"0E" when '0'&X"2d", -- R
X"0F" when '0'&X"35", -- Y
X"10" when '0'&X"2c", -- T
X"11" when '0'&X"3c", -- U
X"12" when '0'&X"43", -- I
X"13" when '0'&X"44", -- O
X"14" when '0'&X"1c", -- A
X"15" when '0'&X"23", -- D
X"16" when '0'&X"1b", -- S
X"17" when '0'&X"33", -- H
X"18" when '0'&X"2b", -- F
X"19" when '0'&X"34", -- G
X"1A" when '0'&X"3b", -- J
X"1B" when '0'&X"42", -- K
X"1C" when '0'&X"4c", -- ;
X"1D" when '0'&X"4b", -- L
X"1E" when '0'&X"1a", -- Z
X"1F" when '0'&X"22", -- X
X"20" when '0'&X"21", -- C
X"21" when '0'&X"2a", -- V
X"22" when '0'&X"32", -- B
X"23" when '0'&X"31", -- N
X"24" when '0'&X"3a", -- M
X"25" when '0'&X"41", -- ,
X"26" when '0'&X"49", -- .
X"27" when '0'&X"4a", -- /
x"28" when '1'&x"4a", -- KP /
-- X"29" when '1'&x"6b", -- KP Left
X"2A" when '0'&x"70", -- KP 0
X"2B" when '0'&x"69", -- KP 1
X"2C" when '0'&x"72", -- KP 2
X"2D" when '0'&x"7a", -- KP 3
X"2E" when '0'&X"5d", -- \
X"2F" when '0'&X"55", -- =
X"30" when '0'&X"45", -- 0
X"31" when '0'&X"4e", -- -
-- x"32" when x"", -- KP )
-- X"33" when X"76", -- KP Escape ("esc" key)
X"34" when '0'&x"6B", -- KP 4
X"35" when '0'&x"73", -- KP 5
X"36" when '0'&x"74", -- KP 6
X"37" when '0'&x"6C", -- KP 7
X"38" when '0'&X"0e", -- `
X"39" when '0'&X"4d", -- P
X"3A" when '0'&X"54", -- [
X"3B" when '0'&X"5b", -- ]
X"3C" when '0'&X"7c", -- KP *
-- X"3D" when '1'&X"74", -- KP Right
X"3E" when '0'&X"75", -- KP 8
X"3F" when '0'&X"7D", -- KP 9
X"40" when '0'&X"71", -- KP .
X"41" when '0'&X"79", -- KP +
X"42" when '0'&X"5a", -- Carriage return ("enter" key)
X"43" when '1'&X"75", -- (up arrow)
X"44" when '0'&X"29", -- Space
X"45" when '0'&X"52", -- '
-- X"46" when X"4a", -- ?
-- X"47" when X"29", -- KP Space
-- X"48" when x"", -- KP (
X"49" when '0'&X"7b", -- KP -
X"4A" when '1'&X"5a", -- KP return
-- X"4B" when X"", -- KP ,
X"4E" when '0'&X"66", -- KP del (backspace - mapped to left)
X"4D" when '1'&X"72", -- down arrow
X"4E" when '1'&X"6b", -- left arrow
X"4F" when '1'&X"74", -- right arrow
X"FF" when others;
end rtl;