generate_obstacles.txt

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity Linear_Feedback_shift_reg is
   port ( game_clock : in std_logic;
	             dead : in std_logic;
	            reset : in std_logic;
			   obst_out : out std_logic);
end Linear_Feedback_shift_reg;

architecture Behavioral of Linear_Feedback_shift_reg is
   signal linear_feedback_shift_register : std_logic_vector (31 downto 0) := "00000000000000000000000000100000";
	signal linear_feedback_shift_register_next : std_logic_vector (31 downto 0) := "00000000000000000000000000100000";
begin

   process(game_clock, reset)
	begin
	   if (dead = '1') then
		   linear_feedback_shift_register <= "00000000000000000000000000000000";
	   elsif (reset = '1') then
		   linear_feedback_shift_register <= "00000000000000000000000000100000";
	   else   
			if (rising_edge(game_clock)) then
			   linear_feedback_shift_register <= linear_feedback_shift_register_next;
		   end if;
		end if;
	end process;
	
	process(linear_feedback_shift_register)
	begin
	   linear_feedback_shift_register_next (31 downto 1) <= linear_feedback_shift_register (30 downto 0);
		linear_feedback_shift_register_next (0) <= linear_feedback_shift_register(31) xor linear_feedback_shift_register(5);
	end process;
	
	obst_out <= linear_feedback_shift_register(0);


end Behavioral;