--Angepasst von: https://github.com/Johnnyjax/vga-kbd-terminal

 

library ieee;
use ieee.std_logic_1164.all;

entity vga_txt_main is

port (sys_clk, output_mode : in std_logic;
reset : in std_ulogic;
rx_done_tick_in : in std_ulogic;
vga_dout : in std_ulogic_vector (7 downto 0);
vga_hs, vga_vs : out std_logic;
vga_r, vga_b, vga_g : out std_logic_vector(7 downto 0);
vga_clk : out std_logic;
vga_blank_n : out std_logic;
vga_sync_n : out std_logic);

end vga_txt_main;

architecture arch of vga_txt_main is

signal pixel_x, pixel_y : std_ulogic_vector(9 downto 0);
signal video_on, pixel_tick : std_ulogic;
signal rgb_reg, rgb_next : std_ulogic_vector(2 downto 0);

signal scan_data, w_data : std_ulogic_vector(7 downto 0);
signal kb_not_empty, kb_buf_empty : std_ulogic;
signal key_code, ascii_code : std_ulogic_vector(7 downto 0);
signal enter_tick : std_ulogic;
signal up_tick, down_tick, left_tick, right_tick : std_ulogic;
signal bck_spc_tick : std_ulogic;
signal clk_25MHz :std_ulogic;

begin

vga_blank_n <= '1';
vga_sync_n <= '0';
vga_clk <= clk_25mhz;

vga_sync: entity work.vga_sync

port map (clk => sys_clk, reset => reset, vsync => vga_vs, hsync => vga_hs, video_on => video_on, p_tick => pixel_tick, pixel_x => pixel_x, pixel_y => pixel_y);

text_gen: entity work.vga_text

port map (clk => sys_clk, key_code => key_code(6 downto 0), video_on => video_on, pixel_x => pixel_x, pixel_y => pixel_y,
we => kb_not_empty, enter_tick => enter_tick, text_rgb => rgb_next, up_tick => up_tick, down_tick => down_tick, left_tick => left_tick, right_tick => right_tick,
bck_spc_tick => bck_spc_tick, output_mode => output_mode);

kb_code: entity work.kb_code(arch)

port map(clk => sys_clk, reset => reset, rd_key_code => kb_not_empty, key_code => key_code, enter_tick => enter_tick, kb_buf_empty => kb_buf_empty, up_tick => up_tick,
down_tick => down_tick, left_tick => left_tick, right_tick => right_tick, bck_spc_tick => bck_spc_tick, rx_done_tick_in => rx_done_tick_in, vga_dout => vga_dout);

 

process(sys_clk)

begin

if(sys_clk'event and sys_clk = '1') then
   clk_25mhz <= not clk_25mhz;

   if(pixel_tick = '1') then
      rgb_reg <= rgb_next;
   end if;
end if;
end process;

kb_not_empty <= not kb_buf_empty;
vga_r <= (others => rgb_reg(2));
vga_g <= (others => rgb_reg(1));
vga_b <= (others => rgb_reg(0));

end arch;