-------------------------------------------------------------------------------
--
-- EE 552 Project: Driver's Ed
--
-- led.vhd     
--
-- Description: Top Level Architecture to instantiate a keypad decoder state machine
--              and output the detected key to an LED and an output port that
--              will be connected to the VGA display entity.  The other LED
--              will have a value of 0
--
-- Author: Raymond Sung
--
-- Compiled and Simulated with No Known Errors
--
-------------------------------------------------------------------------------

LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
USE ieee.std_logic_unsigned.all;
library work;
use work.keytest_pkg.all;

ENTITY keytest IS
  PORT(
    clk			: IN	STD_LOGIC;
    resetn		: IN	STD_LOGIC;
    row			: IN	STD_LOGIC_VECTOR(3 downto 0);
    col			: OUT   STD_LOGIC_VECTOR(3 downto 0);					
    keyvalid	: OUT 	STD_LOGIC;
    led_output	: OUT 	STD_LOGIC_VECTOR(6 downto 0);
    unused_led	: OUT	STD_LOGIC_VECTOR(6 downto 0);
    keyvalue_output : OUT STD_LOGIC_VECTOR(3 downto 0)
    );
END keytest;

architecture structural of keytest is

  signal internal_keyvalue: std_logic_vector(3 downto 0);
  signal zero: std_logic_vector(3 downto 0);	

begin

  zero <= "0000";
  keyvalue_output <= internal_keyvalue;

  -- instantiate the keypad scanning state machin
  keydecode_part:
    component keydecode 
      PORT MAP
      (
        clk			=> clk,
        resetn		=> resetn,
        row			=> row,
        col			=> col,
        keyvalue_registered	=> internal_keyvalue,			
        keyvalid	=> keyvalid		
        );

  -- instantiate the hexadecimal to seven segment decoder
  led_part:
    component led 
      port map 
      (
        input => internal_keyvalue,			
        led_output => led_output     	
        );

  -- instantiate the hexadecimal to seven segment decoder which is unsed
  -- and driven to "0000"
  unused_led_part:
    component led 
      port map 
      (
        input => zero,			
        led_output => unused_led     	
        );

end;