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idiolatrie |
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-- PS2 Keyboard Controller - German Keyboard Layout --
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--------------------------------------------------------------------------------
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-- Copyright (C)2011 Mathias Hörtnagl <mathias.hoertnagl@gmail.comt> --
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-- --
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-- This program is free software: you can redistribute it and/or modify --
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-- it under the terms of the GNU General Public License as published by --
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-- the Free Software Foundation, either version 3 of the License, or --
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-- (at your option) any later version. --
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-- --
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-- This program is distributed in the hope that it will be useful, --
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of --
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the --
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-- GNU General Public License for more details. --
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-- --
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-- You should have received a copy of the GNU General Public License --
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-- along with this program. If not, see <http://www.gnu.org/licenses/>. --
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--------------------------------------------------------------------------------
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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entity ascii is
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port(
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clk : in std_logic;
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shft : in std_logic;
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altgr : in std_logic;
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code : in std_logic_vector(7 downto 0);
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char : out std_logic_vector(7 downto 0)
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);
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end ascii;
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architecture rtl of ascii is
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begin
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conv : process(clk)
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begin
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if rising_edge(clk) then
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case code is
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--------------------------------------------------------------------
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-- Keys that are independend of the state of SHFT and ALTGR. --
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--------------------------------------------------------------------
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when X"66" => char <= X"08"; -- BS (BACKSPACE)
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when X"0d" => char <= X"09"; -- HT (TAB)
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when X"5a" => char <= X"0d"; -- CR (ENTER)
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when X"76" => char <= X"1b"; -- ESC (ESCAPE)
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when X"29" => char <= X"20"; -- SP (SPACE)
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when X"71" => char <= X"7f"; -- DEL (DELETE)
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when X"7e" => char <= X"80"; -- SCROLL
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when X"75" => char <= X"f0"; -- UP ARROW
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when X"6b" => char <= X"f1"; -- LEFT ARROW
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when X"72" => char <= X"f2"; -- DOWN ARROW
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when X"74" => char <= X"f3"; -- RIGHT ARROW
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--when X"" => char <= X""
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when others =>
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case (altgr & shft & code) is
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--------------------------------------------------------------
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-- SHFT and ALTGR not pressed. --
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--------------------------------------------------------------
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when "00" & X"0e" => char <= X"5e"; -- ^
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when "00" & X"15" => char <= X"71"; -- q
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when "00" & X"16" => char <= X"31"; -- 1
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when "00" & X"1a" => char <= X"79"; -- y
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when "00" & X"1b" => char <= X"73"; -- s
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when "00" & X"1c" => char <= X"61"; -- a
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when "00" & X"1d" => char <= X"77"; -- w
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when "00" & X"1e" => char <= X"32"; -- 2
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when "00" & X"21" => char <= X"63"; -- c
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when "00" & X"22" => char <= X"78"; -- x
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when "00" & X"23" => char <= X"64"; -- d
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when "00" & X"24" => char <= X"65"; -- e
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when "00" & X"25" => char <= X"34"; -- 4
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when "00" & X"26" => char <= X"33"; -- 3
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when "00" & X"2a" => char <= X"76"; -- v
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when "00" & X"2b" => char <= X"66"; -- f
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when "00" & X"2c" => char <= X"74"; -- t
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when "00" & X"2d" => char <= X"72"; -- r
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when "00" & X"2e" => char <= X"35"; -- 5
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when "00" & X"31" => char <= X"6e"; -- n
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when "00" & X"32" => char <= X"62"; -- b
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when "00" & X"33" => char <= X"68"; -- h
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when "00" & X"34" => char <= X"67"; -- g
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when "00" & X"35" => char <= X"7a"; -- z
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when "00" & X"36" => char <= X"36"; -- 6
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when "00" & X"3a" => char <= X"6d"; -- m
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when "00" & X"3b" => char <= X"6a"; -- j
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when "00" & X"3c" => char <= X"75"; -- u
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when "00" & X"3d" => char <= X"37"; -- 7
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when "00" & X"3e" => char <= X"38"; -- 8
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when "00" & X"41" => char <= X"2c"; -- ,
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when "00" & X"42" => char <= X"6b"; -- k
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when "00" & X"43" => char <= X"69"; -- i
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when "00" & X"44" => char <= X"6f"; -- o
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when "00" & X"45" => char <= X"30"; -- 0
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when "00" & X"46" => char <= X"39"; -- 9
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when "00" & X"49" => char <= X"2e"; -- .
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when "00" & X"4a" => char <= X"2d"; -- -
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when "00" & X"4b" => char <= X"6c"; -- l
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when "00" & X"4d" => char <= X"70"; -- p
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when "00" & X"5b" => char <= X"2b"; -- +
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when "00" & X"5d" => char <= X"23"; -- #
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when "00" & X"61" => char <= X"3c"; -- <
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--------------------------------------------------------------
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-- SHFT pressed. --
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--------------------------------------------------------------
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when "01" & X"15" => char <= X"51"; -- Q
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when "01" & X"16" => char <= X"21"; -- !
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when "01" & X"1a" => char <= X"59"; -- Y
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when "01" & X"1b" => char <= X"53"; -- S
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when "01" & X"1c" => char <= X"41"; -- A
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when "01" & X"1d" => char <= X"57"; -- W
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when "01" & X"1e" => char <= X"22"; -- "
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when "01" & X"21" => char <= X"43"; -- C
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when "01" & X"22" => char <= X"58"; -- X
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when "01" & X"23" => char <= X"44"; -- D
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when "01" & X"24" => char <= X"45"; -- E
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when "01" & X"25" => char <= X"24"; -- $
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when "01" & X"2a" => char <= X"56"; -- V
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when "01" & X"2b" => char <= X"46"; -- F
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when "01" & X"2c" => char <= X"54"; -- T
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when "01" & X"2d" => char <= X"52"; -- R
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when "01" & X"2e" => char <= X"25"; -- %
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when "01" & X"31" => char <= X"4e"; -- N
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when "01" & X"32" => char <= X"42"; -- B
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when "01" & X"33" => char <= X"48"; -- H
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when "01" & X"34" => char <= X"47"; -- G
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when "01" & X"35" => char <= X"5a"; -- Z
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when "01" & X"36" => char <= X"26"; -- &
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when "01" & X"3a" => char <= X"4d"; -- M
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when "01" & X"3b" => char <= X"4a"; -- J
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when "01" & X"3c" => char <= X"55"; -- U
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when "01" & X"3d" => char <= X"2f"; -- /
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when "01" & X"3e" => char <= X"28"; -- (
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when "01" & X"41" => char <= X"3b"; -- ;
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when "01" & X"42" => char <= X"4b"; -- K
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when "01" & X"43" => char <= X"49"; -- I
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when "01" & X"44" => char <= X"4f"; -- O
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when "01" & X"45" => char <= X"3d"; -- =
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when "01" & X"46" => char <= X"29"; -- )
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when "01" & X"49" => char <= X"3a"; -- :
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when "01" & X"4a" => char <= X"5f"; -- _
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when "01" & X"4b" => char <= X"4c"; -- L
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when "01" & X"4d" => char <= X"50"; -- P
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when "01" & X"4e" => char <= X"3f"; -- ?
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when "01" & X"55" => char <= X"60"; -- `
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when "01" & X"5b" => char <= X"2a"; -- *
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when "01" & X"5d" => char <= X"27"; -- '
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when "01" & X"61" => char <= X"3e"; -- >
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--------------------------------------------------------------
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-- ALTGR pressed. --
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--------------------------------------------------------------
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when "10" & X"15" => char <= X"40"; -- @
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when "10" & X"3d" => char <= X"7b"; -- {
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when "10" & X"3e" => char <= X"5b"; -- [
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when "10" & X"45" => char <= X"7d"; -- }
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when "10" & X"46" => char <= X"5d"; -- ]
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when "10" & X"4e" => char <= X"5c"; -- \
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when "10" & X"5b" => char <= X"7e"; -- ~
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when "10" & X"61" => char <= X"7c"; -- |
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--------------------------------------------------------------
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-- SHFT and ALTGR pressed. --
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--------------------------------------------------------------
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--------------------------------------------------------------
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-- Everything else returns the empty key X"00". --
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--------------------------------------------------------------
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when others => char <= X"00";
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end case;
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end case;
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end if;
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end process;
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end rtl;
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