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Add pattern generator for demoing the scrolling behaviour

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This commit is contained in:
Klemens Schölhorn 2018-04-25 23:57:01 +02:00
parent 1c22e73128
commit e960fae673
1 changed files with 41 additions and 4 deletions
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45
main.vhd
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@ -35,6 +35,9 @@ architecture syn of main is
signal clk_vga: std_logic;
signal reset: std_logic;
signal write_enable: std_logic;
signal write_data: std_logic_vector(7 downto 0);
begin
reset <= switch_center;
@ -48,10 +51,8 @@ begin
terminal: entity work.terminal port map (
clk => clk_vga,
reset => reset,
write_enable => '0',
write_data => x"00",
write_enable => write_enable,
write_data => write_data,
dvi_d => dvi_d,
dvi_clk_p => dvi_clk_p,
dvi_clk_n => dvi_clk_n,
@ -63,6 +64,42 @@ begin
i2c_sda => i2c_sda
);
-- write an example text pattern to test the terminal
process(clk_vga, reset)
variable delay: integer range 0 to 300_000;
variable line: integer range 0 to 90;
variable max: integer range 0 to 90;
begin
if reset = '1' then
delay := 0;
line := 0;
max := 0;
elsif rising_edge(clk_vga) then
write_enable <= '0';
if delay = 300_000 then
write_enable <= '1';
write_data <= "0" & std_logic_vector(to_unsigned(33 + line, 7));
if line = max then
write_data <= x"0a";
line := 0;
if max = 90 then
max := 0;
else
max := max + 1;
end if;
else
line := line + 1;
end if;
delay := 0;
else
delay := delay + 1;
end if;
end if;
end process;
keyboard_i: entity work.keyboard generic map (
input_clk => clk_vga_f
) port map (