----------------------------------------------------------------------------------
-- Company:  INSA-Toulouse
-- Engineer: Paul Faure
-- 
-- Create Date: 01.07.2021 09:09:30
-- Module Name: Keyboard - Behavioral
-- Project Name: Processeur sécurisé
-- Target Devices: Basys 3 ARTIX7
-- Tool Versions: Vivado 2016.4
--
-- Description: Composant clavier, intègre le controleur du clavier pour en faire un composant bufferisé
-- 
-- Dependencies: 
--   - KeyboardControler
--   - KeyboardToASCII
--
-- Comments : Transforme aussi la keycode en code ASCII
----------------------------------------------------------------------------------

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity Keyboard is
    Port (CLK : in STD_LOGIC;
  
          PS2Clk : in STD_LOGIC;
          PS2Data : in STD_LOGIC;
        
          Data_read : in STD_LOGIC;
          Data_av : out STD_LOGIC;
          Data : out STD_LOGIC_VECTOR (0 to 6);
        
          alert : out STD_LOGIC);
end Keyboard;

architecture Behavioral of Keyboard is

    component KeyboardControler 
    Port (CLK : in STD_LOGIC;
  
          PS2Clk : in STD_LOGIC;
          PS2Data : in STD_LOGIC;
        
          Data_av : out STD_LOGIC;
          Data : out STD_LOGIC_VECTOR (0 to 7);
          
          alert : out STD_LOGIC);
    end component;
    
    component KeyboardToASCII
        Port ( KeyCode : in STD_LOGIC_VECTOR (0 to 7);
               CodeASCII : out STD_LOGIC_VECTOR (0 to 6));
    end component;
    
    signal buffer_Data : STD_LOGIC_VECTOR (0 to 7);
    signal kbCtrl_Data_av : STD_LOGIC;
    
    signal intern_Data_av : STD_LOGIC := '0';
    signal intern_Data : STD_LOGIC_VECTOR (0 to 6) := (others => '0');

begin
    
    instance_KeyboardControler : KeyboardControler
    port map (CLK => CLK,
      
              PS2Clk => PS2Clk,
              PS2Data => PS2Data,
            
              Data_av => kbCtrl_Data_av,
              Data => buffer_Data,
              
              alert => alert);
              
    instance_KeyboardToASCII : KeyboardToASCII 
    port map ( KeyCode => buffer_Data,
               CodeASCII => intern_Data);
              
    process
    begin
        wait until CLK'event and CLK = '1';
        if (intern_Data_av = '0') then
            if (kbCtrl_Data_av = '1') then
                Data <= intern_Data;
                intern_Data_av <= '1';
            end if;
        elsif (Data_read = '1') then
            intern_Data_av <= '0';
        end if;
    end process;

    Data_av <= intern_Data_av;

end Behavioral;