lab6-ECEn320

lab6.vhd

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

-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;

-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;

entity TopLevelVGA is
	port(
	
		--mapped to component.
		clk 	: in std_logic;
		
		--hardware inputs
		sw 	: in std_logic_vector(7 downto 0);
		btn 	: in std_logic_vector(3 downto 0);
		
		--outputs
		vgaRed			: out std_logic_vector(2 downto 0);
		vgaGreen			: out std_logic_vector(2 downto 0);
		vgaBlue			: out std_logic_vector(1 downto 0);
		Hsync 			: out std_logic;
		Vsync 			: out std_logic;
		
		-- For 7 Seg
		an					: out std_logic_vector(3 downto 0);
		dp					: out std_logic;
		seg				: out std_logic_vector(6 downto 0)
	);
end TopLevelVGA;

architecture Behavioral of TopLevelVGA is
--top level I/O
--		signal red_wire	:  std_logic_vector(2 downto 0);
--		signal green_wire	:  std_logic_vector(2 downto 0);
--		signal blue_wire	:  std_logic_vector(1 downto 0);
		signal color		:	std_logic_vector(7 downto 0);
		
		signal red_display	:  std_logic_vector(2 downto 0);
		signal green_display	:  std_logic_vector(2 downto 0);
		signal blue_display	:  std_logic_vector(1 downto 0);

		signal horiz_color 	: std_logic_vector(7 downto 0); --top three bits are red, next three are green, bottom 2 are blue.
		signal vert_color 	: std_logic_vector(7 downto 0); --top three bits are red, next three are green, bottom 2 are blue.
		
--		signal q_next,q_reg	: unsigned(16 downto 0); -- registers for display frames / sec on 7 seg
--		signal seg_counter	: std_logic_vector(16 downto 0); -- goes on 7 seg display
		
--vga I/O
		--inputs
		signal 	x_pixel			:  std_logic_vector(9 downto 0);
		signal 	y_pixel			:  std_logic_vector(9 downto 0);
		signal 	top_last_column	:  std_logic;
		signal 	top_last_row		:  std_logic;
		signal 	top_blank			:  std_logic; 
		signal 	top_rst				:	std_logic;

		signal	top_HS			: std_logic;
		signal	top_VS			: std_logic;

--const's:
		constant BLACK		:	std_logic_vector(7 downto 0) := "00000000";
		constant BLUE		:	std_logic_vector(7 downto 0) := "00000011";
		constant GREEN		:	std_logic_vector(7 downto 0) := "00011100";
		constant CYAN		:	std_logic_vector(7 downto 0) := "00011111";
		constant RED		:	std_logic_vector(7 downto 0) := "11100000";
		constant MAGENTA	:	std_logic_vector(7 downto 0) := "11100011";
		constant YELLOW	:	std_logic_vector(7 downto 0) := "11111100";
		constant WHITE		:	std_logic_vector(7 downto 0) := "11111111";
		
		constant BALL_SPEED		:	unsigned(2 downto 0) := to_unsigned(1,3);
		constant BALL_WIDTH		:	unsigned(2 downto 0) := to_unsigned(10,4);

	component vga_timing
			port(
			clk 			: in 	std_logic;
			rst 			: in 	std_logic;
			HS				: out std_logic;
			VS				: out std_logic;
			pixel_x		: out std_logic_vector(9 downto 0);
			pixel_y		: out std_logic_vector(9 downto 0);
			last_column	: out std_logic;
			last_row		: out std_logic;
			blank			: out std_logic
		);
	end component;
	
	component seven_segment_display
			port(
			clk		: in std_logic;
			data_in 	: in std_logic_vector (15 downto 0);
			dp_in 	: in std_logic_vector (3 downto 0);
			blank 	: in std_logic_vector (3 downto 0);
			seg		: out std_logic_vector (6 downto 0);
			dp			: out std_logic;
			an			: out std_logic_vector (3 downto 0)
		);
	end component;

signal animation_reg_next, animation_reg : unsigned(19 downto 0);
signal move_en 		: std_logic;--pulses
signal l_rect 			: unsigned(9 downto 0) := to_unsigned(220,10);
signal l_rect_next 	: unsigned(9 downto 0) := to_unsigned(220,10);
signal r_rect 			: unsigned(9 downto 0) := to_unsigned(210,10);
signal r_rect_next 	: unsigned(9 downto 0) := to_unsigned(210,10);

signal ball_x			: unsigned(9 downto 0) := to_unsigned(320,10);
signal ball_x_next	: unsigned(9 downto 0) := to_unsigned(320,10);
signal ball_y			: unsigned(9 downto 0) := to_unsigned(225,10);
signal ball_y_next	: unsigned(9 downto 0) := to_unsigned(225,10);

signal move_left,move_left_next		: std_logic	:= '1';
signal move_up,move_up_next		: std_logic := '1';
signal toggle_x_direction : std_logic := '0';

signal seg_val, seg_val_next : std_logic_vector(15 downto 0);

begin

--left is component, right is top level.
my_vga : vga_timing port map(
					clk=>clk,
					rst=>top_rst,
					HS=>top_HS,
					VS=>top_VS, 
					pixel_x=>x_pixel, 
					pixel_y=>y_pixel,
					last_column=>top_last_column, 
					last_row=>top_last_row,
					blank=>top_blank
				);
my_seg : seven_segment_display port map(
					clk		=> clk,
					data_in 	=> seg_val,
					dp_in 	=> "0000",
					blank 	=> "0000",
					seg		=> seg,
					dp			=> dp,
					an			=> an
				);			


process(clk,toggle_x_direction)
 begin
		if(clk'event and clk='1') then
			animation_reg <= animation_reg_next;
			l_rect <= l_rect_next;
			r_rect <= r_rect_next;
			ball_x <= ball_x_next;
			ball_y <= ball_y_next;
			move_up	 <= move_up_next;
			move_left <= move_left_next;
			seg_val <= seg_val_next;
		end if;
end process;

----------------------------------------
--				next state logic
----------------------------------------
--------------------
--		Paddles
--------------------
--left paddle
l_rect_next <= 	l_rect + 2 		when 		move_en = '1' and btn(3) = '1'   and l_rect < (470-1-50)		else
						l_rect - 2 		when		move_en = '1' and btn(2) = '1'	and l_rect > (10+1) 		else
						l_rect;
--right paddle
r_rect_next <= 	r_rect + 2 		when 		move_en = '1' and btn(1) = '1'   and r_rect < (470-1-50)		else
						r_rect - 2 		when		move_en = '1' and btn(0) = '1'	and r_rect > (10+1) 		else
						r_rect;
--------------------
--		ball
--------------------
move_left_next  <= '1' 	when ball_x = 620 else
						 '0'	when ball_x = 10 else 
						 move_left;
						 
move_up_next  <= 	 '1' 	when ball_y = 460 else
						 '0'	when ball_y = 10 else 
						 move_up;
						 
ball_x_next <= 	ball_x						when 		move_en = '0' 						else
						ball_x + BALL_SPEED		when 		move_left='0' and move_en='1'	else
						ball_x - BALL_SPEED		when 		move_left='1' and move_en='1'	else
						ball_x;	
						
ball_y_next <= 	ball_y						when 		move_en = '0' 	else
						ball_y + BALL_SPEED		when 		move_up='0' and move_en='1'	else
						ball_y - BALL_SPEED		when		move_up='1' and move_en='1'	else
						ball_y;

--pulses high for one clk cycle when move is enabled.					
move_en <= '1' when animation_reg = X"3FFFE" else '0'; 
--counts up to 3FFFE, then resets to 0.
animation_reg_next <= (others=>'0') when animation_reg=X"3FFFE" else animation_reg + 1; 

--------------------
--		RGB paint.
--------------------		
color <= RED 		when 	unsigned(x_pixel) < 10 					or 
								unsigned(y_pixel) < 10 					or 
								unsigned(x_pixel) > (630-1)  			or 
								unsigned(y_pixel) > (470-1) 
								else 
			WHITE		when	unsigned(y_pixel)+BALL_WIDTH > ball_y and 
								unsigned(y_pixel)-BALL_WIDTH < ball_y and
								unsigned(x_pixel)+BALL_WIDTH > ball_x and
								unsigned(x_pixel)-BALL_WIDTH < ball_x
								else
			YELLOW	when 	unsigned(y_pixel)	>	(l_rect)			and --left pong paddle
								unsigned(y_pixel) <	(l_rect + 50)	and
								unsigned(x_pixel) >	(20-1)			and 
								unsigned(x_pixel) <	 27			
								else
			WHITE when 		unsigned(x_pixel) = 320
								else
			BLUE	when 		unsigned(y_pixel)	>	(r_rect)			and --right pong paddle
								unsigned(y_pixel) <	(r_rect + 50)	and 
								unsigned(x_pixel) >(640-20-10-1)			and 
								unsigned(x_pixel) < (640-20-10-1+7)			
								else																							  
			BLACK;
			
--------------------
--		seven seg
--------------------
seg_val_next <= std_logic_vector(unsigned(seg_val) + 1) when top_last_column='1' and top_last_row='1' and animation_reg(0)='1' else
					 seg_val;
--------------------					 
--	blank on blank.
--------------------
red_display 	<= color(7 downto 5) 	when top_blank='0' else "000";
green_display 	<= color(4 downto 2) 	when top_blank='0' else "000";
blue_display 	<= color(1 downto 0) 	when top_blank='0' else "00";
--------------------
--		OFL	
--------------------	
vgaRed 	<= red_display;
vgaGreen <= green_display;
vgaBlue 	<= blue_display;
Hsync 	<= top_HS;
Vsync 	<= top_VS;

end Behavioral;