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rrred |
library IEEE;
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use IEEE.std_logic_1164.all;
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entity ps2kbd is
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PORT (
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keyboard_clk : inout std_logic;
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keyboard_data : inout std_logic;
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clock : in std_logic;
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clkdelay : in std_logic;
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reset : in std_logic;
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read : in std_logic;
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scan_ready : out std_logic;
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ps2_ascii_code : out std_logic_vector(7 downto 0));
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end ps2kbd;
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architecture rtl of ps2kbd is
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--signal keyboard_clk : std_logic;
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--signal keyboard_data : std_logic;
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--signal clock : std_logic;
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--signal reset : std_logic;
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--signal read : std_logic;
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--signal scan_ready : std_logic;
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--signal ps2_ascii_code : std_logic_vector(7 downto 0);
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signal scan_code_sig : std_logic_vector(7 downto 0);
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signal scan_code : std_logic_vector(11 downto 0);
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signal shift : std_logic_vector(1 downto 0);
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signal caps : std_logic_vector(1 downto 0);
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signal ctrlkey : std_logic_vector(3 downto 0);
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begin
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process (clkdelay)
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begin
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if clkdelay'event and clkdelay='1' then
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if scan_code_sig = x"58" then
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if caps = "00" then
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caps <= "01";
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elsif caps = "01" then
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caps <= "11";
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elsif caps = "11" then
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caps <= "10";
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else
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caps <= "00";
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end if;
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end if;
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end if;
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scan_code <= "000" & caps(0) & scan_code_sig;
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end process;
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ps2_ascii_decode : process(scan_code)
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begin
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case scan_code is
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when x"066" => ps2_ascii_code <= x"08"; -- Backspace ("backspace" key)
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when x"00d" => ps2_ascii_code <= x"09"; -- Horizontal Tab
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when x"05a" => ps2_ascii_code <= x"0d"; -- Carriage return ("enter" key)
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when x"076" => ps2_ascii_code <= x"1b"; -- Escape ("esc" key)
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when x"029" => ps2_ascii_code <= x"20"; -- Space
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when x"116" => ps2_ascii_code <= x"21"; -- !
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when x"152" => ps2_ascii_code <= x"22"; -- "
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when x"126" => ps2_ascii_code <= x"23"; -- #
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when x"125" => ps2_ascii_code <= x"24"; -- $
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when x"12e" => ps2_ascii_code <= x"25"; --
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when x"13d" => ps2_ascii_code <= x"26"; --
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when x"052" => ps2_ascii_code <= x"27"; --
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when x"146" => ps2_ascii_code <= x"28"; --
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when x"145" => ps2_ascii_code <= x"29"; --
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when x"13e" => ps2_ascii_code <= x"2a"; -- *
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when x"155" => ps2_ascii_code <= x"2b"; -- +
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when x"041" => ps2_ascii_code <= x"2c"; -- ,
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when x"04e" => ps2_ascii_code <= x"2d"; -- -
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when x"049" => ps2_ascii_code <= x"2e"; -- .
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when x"04a" => ps2_ascii_code <= x"2f"; -- /
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when x"045" => ps2_ascii_code <= x"30"; -- 0
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when x"016" => ps2_ascii_code <= x"31"; -- 1
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when x"01e" => ps2_ascii_code <= x"32"; -- 2
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when x"026" => ps2_ascii_code <= x"33"; -- 3
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when x"025" => ps2_ascii_code <= x"34"; -- 4
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when x"02e" => ps2_ascii_code <= x"35"; -- 5
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when x"036" => ps2_ascii_code <= x"36"; -- 6
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when x"03d" => ps2_ascii_code <= x"37"; -- 7
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when x"03e" => ps2_ascii_code <= x"38"; -- 8
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when x"046" => ps2_ascii_code <= x"39"; -- 9
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when x"14c" => ps2_ascii_code <= x"3a"; -- :
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when x"04c" => ps2_ascii_code <= x"3b"; -- ;
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when x"141" => ps2_ascii_code <= x"3c"; -- <
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when x"055" => ps2_ascii_code <= x"3d"; -- =
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when x"149" => ps2_ascii_code <= x"3e"; -- >
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when x"14a" => ps2_ascii_code <= x"3f"; -- ?
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when x"11e" => ps2_ascii_code <= x"40"; -- @
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when x"11c" => ps2_ascii_code <= x"41"; -- A
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when x"132" => ps2_ascii_code <= x"42"; -- B
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when x"121" => ps2_ascii_code <= x"43"; -- C
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when x"123" => ps2_ascii_code <= x"44"; -- D
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when x"124" => ps2_ascii_code <= x"45"; -- E
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when x"12b" => ps2_ascii_code <= x"46"; -- F
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when x"134" => ps2_ascii_code <= x"47"; -- G
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when x"133" => ps2_ascii_code <= x"48"; -- H
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when x"143" => ps2_ascii_code <= x"49"; -- I
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when x"13b" => ps2_ascii_code <= x"4a"; -- J
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when x"142" => ps2_ascii_code <= x"4b"; -- K
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when x"14b" => ps2_ascii_code <= x"4c"; -- L
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when x"13a" => ps2_ascii_code <= x"4d"; -- M
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when x"131" => ps2_ascii_code <= x"4e"; -- N
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when x"144" => ps2_ascii_code <= x"4f"; -- O
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when x"14d" => ps2_ascii_code <= x"50"; -- P
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when x"115" => ps2_ascii_code <= x"51"; -- Q
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when x"12d" => ps2_ascii_code <= x"52"; -- R
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when x"11b" => ps2_ascii_code <= x"53"; -- S
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when x"12c" => ps2_ascii_code <= x"54"; -- T
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when x"13c" => ps2_ascii_code <= x"55"; -- U
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when x"12a" => ps2_ascii_code <= x"56"; -- V
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when x"11d" => ps2_ascii_code <= x"57"; -- W
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when x"122" => ps2_ascii_code <= x"58"; -- X
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when x"135" => ps2_ascii_code <= x"59"; -- Y
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when x"11a" => ps2_ascii_code <= x"5a"; -- Z
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when x"054" => ps2_ascii_code <= x"5b"; -- [
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when x"05d" => ps2_ascii_code <= x"5c"; -- \
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when x"05b" => ps2_ascii_code <= x"5d"; -- ]
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when x"136" => ps2_ascii_code <= x"5e"; -- ^
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when x"14e" => ps2_ascii_code <= x"5f"; -- _
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when x"00e" => ps2_ascii_code <= x"60"; -- `
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when x"01c" => ps2_ascii_code <= x"61"; -- a
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when x"032" => ps2_ascii_code <= x"62"; -- b
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when x"021" => ps2_ascii_code <= x"63"; -- c
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when x"023" => ps2_ascii_code <= x"64"; -- d
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when x"024" => ps2_ascii_code <= x"65"; -- e
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when x"02b" => ps2_ascii_code <= x"66"; -- f
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when x"034" => ps2_ascii_code <= x"67"; -- g
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when x"033" => ps2_ascii_code <= x"68"; -- h
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when x"043" => ps2_ascii_code <= x"69"; -- i
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when x"03b" => ps2_ascii_code <= x"6a"; -- j
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when x"042" => ps2_ascii_code <= x"6b"; -- k
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when x"04b" => ps2_ascii_code <= x"6c"; -- l
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when x"03a" => ps2_ascii_code <= x"6d"; -- m
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when x"031" => ps2_ascii_code <= x"6e"; -- n
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when x"044" => ps2_ascii_code <= x"6f"; -- o
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when x"04d" => ps2_ascii_code <= x"70"; -- p
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when x"015" => ps2_ascii_code <= x"71"; -- q
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when x"02d" => ps2_ascii_code <= x"72"; -- r
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when x"01b" => ps2_ascii_code <= x"73"; -- s
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when x"02c" => ps2_ascii_code <= x"74"; -- t
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when x"03c" => ps2_ascii_code <= x"75"; -- u
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when x"02a" => ps2_ascii_code <= x"76"; -- v
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when x"01d" => ps2_ascii_code <= x"77"; -- w
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when x"022" => ps2_ascii_code <= x"78"; -- x
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when x"035" => ps2_ascii_code <= x"79"; -- y
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when x"01a" => ps2_ascii_code <= x"7a"; -- z
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when x"154" => ps2_ascii_code <= x"7b"; -- {
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when x"15d" => ps2_ascii_code <= x"7c"; -- |
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when x"15b" => ps2_ascii_code <= x"7d"; -- }
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when x"10e" => ps2_ascii_code <= x"7e"; -- ~
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when x"071" => ps2_ascii_code <= x"7f"; -- (Delete OR DEL on numeric keypad)
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when x"171" => ps2_ascii_code <= x"7f"; -- (Delete OR DEL on numeric keypad)
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when others => ps2_ascii_code <= x"FF"; -- keys not mapped
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end case;
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end process;
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kbd_inst: work.keyboard port map (
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keyboard_clk => keyboard_clk,
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keyboard_data => keyboard_data,
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clock => clock,
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reset => reset,
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read => read,
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scan_ready => scan_ready,
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scan_code => scan_code_sig
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);
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end;
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