library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;

entity debouncer is
	port (clk              : in std_logic;
	      reset            : in std_logic;
		  enable 	       : in std_logic;
		  enable_debounced : out std_logic
		  );
end entity debouncer;


architecture Behavioral of debouncer is

signal count1000000   : integer range 0 to 999999;
signal clk_1MHz 	  : std_logic;
signal enable_sampled : std_logic:='0';                 --ENABLE push button pressed

begin

	div_1MHz : process (clk, reset) is           --Counts 1M clock ticks
	begin
		if reset = '1' then
			clk_1MHz <= '0';
			count1000000 <= 0;
		elsif rising_edge(clk) then
			if count1000000 = 999999 then
				count1000000 <= 0;
				clk_1MHz 	<= '1';
			else
				count1000000 <= count1000000 + 1;
				clk_1MHz <= '0';
			end if;
		end if;
	end process div_1MHz;

	debounce_pb : process (clk) is
	begin
		if rising_edge(clk) then
			if clk_1MHz = '1' then
				if enable = enable_sampled then
					enable_debounced <= enable;
				end if;
				enable_sampled <= enable;
			end if;
		end if;
	end process debounce_pb;

end Behavioral;