Implement basic ascii framebuffer (read only for now)
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0e298a6380
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@ -44,10 +44,6 @@
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<file xil_pn:name="main.ucf" xil_pn:type="FILE_UCF">
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<association xil_pn:name="Implementation" xil_pn:seqID="0"/>
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</file>
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<file xil_pn:name="image_generator.vhd" xil_pn:type="FILE_VHDL">
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<association xil_pn:name="BehavioralSimulation" xil_pn:seqID="154"/>
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<association xil_pn:name="Implementation" xil_pn:seqID="7"/>
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</file>
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<file xil_pn:name="keyboard.vhd" xil_pn:type="FILE_VHDL">
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<association xil_pn:name="BehavioralSimulation" xil_pn:seqID="153"/>
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<association xil_pn:name="Implementation" xil_pn:seqID="4"/>
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@ -56,6 +52,10 @@
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<association xil_pn:name="BehavioralSimulation" xil_pn:seqID="154"/>
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<association xil_pn:name="Implementation" xil_pn:seqID="1"/>
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</file>
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<file xil_pn:name="font_rom.vhd" xil_pn:type="FILE_VHDL">
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<association xil_pn:name="BehavioralSimulation" xil_pn:seqID="155"/>
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<association xil_pn:name="Implementation" xil_pn:seqID="7"/>
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</file>
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</files>
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<properties>
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129
font.hex
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129
font.hex
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@ -0,0 +1,129 @@
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# IBM, Marcel Sondaar, Daniel Hepper bitmap font (public domain, https://github.com/dhepper/font8x8)
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0000000000000000
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0000000000000000
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0000000000000000
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0000000000000000
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0000000000000000
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0000000000000000
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0000000000000000
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0000000000000000
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0000000000000000
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00180018183C3C18
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0000000000003636
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0036367F367F3636
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000C1F301E033E0C
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0063660C18336300
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006E333B6E1C361C
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0000000000030606
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00180C0606060C18
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00060C1818180C06
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0000663CFF3C6600
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00000C0C3F0C0C00
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060C0C0000000000
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000000003F000000
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000C0C0000000000
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000103060C183060
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003E676F7B73633E
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003F0C0C0C0C0E0C
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003F33061C30331E
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001E33301C30331E
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0078307F33363C38
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001E3330301F033F
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001E33331F03061C
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000C0C0C1830333F
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001E33331E33331E
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000E18303E33331E
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000C0C00000C0C00
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060C0C00000C0C00
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00180C0603060C18
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00003F00003F0000
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00060C1830180C06
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000C000C1830331E
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001E037B7B7B633E
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0033333F33331E0C
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003F66663E66663F
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003C66030303663C
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001F36666666361F
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007F46161E16467F
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000F06161E16467F
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007C66730303663C
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003333333F333333
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001E0C0C0C0C0C1E
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001E333330303078
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006766361E366667
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007F66460606060F
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0063636B7F7F7763
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006363737B6F6763
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001C36636363361C
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000F06063E66663F
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00381E3B3333331E
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006766363E66663F
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001E33380E07331E
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001E0C0C0C0C2D3F
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003F333333333333
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000C1E3333333333
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0063777F6B636363
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0063361C1C366363
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001E0C0C1E333333
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007F664C1831637F
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001E06060606061E
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00406030180C0603
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001E18181818181E
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0000000063361C08
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FF00000000000000
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0000000000180C0C
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006E333E301E0000
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003B66663E060607
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001E3303331E0000
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006E33333e303038
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001E033f331E0000
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000F06060f06361C
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1F303E33336E0000
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006766666E360607
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001E0C0C0C0E000C
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1E33333030300030
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0067361E36660607
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001E0C0C0C0C0C0E
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00636B7F7F330000
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00333333331F0000
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001E3333331E0000
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0F063E66663B0000
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78303E33336E0000
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000F06666E3B0000
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001F301E033E0000
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00182C0C0C3E0C08
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006E333333330000
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000C1E3333330000
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00367F7F6B630000
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0063361C36630000
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1F303E3333330000
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003F260C193F0000
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00380C0C070C0C38
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0018181800181818
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00070C0C380C0C07
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0000000000003B6E
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0000000000000000
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87
font_rom.vhd
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87
font_rom.vhd
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@ -0,0 +1,87 @@
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_unsigned.all;
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use ieee.numeric_std.all;
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use std.textio.all;
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use ieee.std_logic_textio.all;
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entity font_rom is
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generic (
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input_clk: integer
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);
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port (
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clk: in std_logic;
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x, y: in std_logic_vector(9 downto 0);
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rgb: out std_logic_vector(23 downto 0)
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);
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end font_rom;
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architecture logic of font_rom is
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type rom_type is array(0 to 127) of std_logic_vector(63 downto 0);
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type framebuffer_type is array(0 to 59, 0 to 79) of std_logic_vector(7 downto 0);
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impure function read_font(filename: in string) return rom_type is
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file rom_file: text is in filename;
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variable rom_line: line;
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variable rom: rom_type;
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begin
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-- skip comment in first line
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readline(rom_file, rom_line);
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for i in rom_type'range loop
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readline(rom_file, rom_line);
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hread(rom_line, rom(i));
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end loop;
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return rom;
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end function;
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constant font: rom_type := read_font("font.hex");
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constant framebuffer: framebuffer_type := (
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0 => (x"48", x"61", x"6C", x"6c", x"6f", others => x"00"),
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1 to 59 => (others => x"00")
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);
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signal char_x: integer range 0 to 79;
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signal char_y: integer range 0 to 59;
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signal current_char: std_logic_vector(7 downto 0);
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signal current_glyph: std_logic_vector(63 downto 0);
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signal current_glyph_pos: integer range 0 to 127;
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signal glyph_pos_raw: std_logic_vector(5 downto 0);
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signal glyph_pos: integer range 0 to 63;
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begin
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char_x <= to_integer(unsigned(x(9 downto 3)));
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char_y <= to_integer(unsigned(y(9 downto 3)));
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process(clk) is
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begin
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if rising_edge(clk) then
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current_char <= framebuffer(char_y, char_x);
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end if;
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end process;
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current_glyph_pos <= to_integer(unsigned(current_char));
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process(clk) is
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begin
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if rising_edge(clk) then
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current_glyph <= font(current_glyph_pos);
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end if;
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end process;
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glyph_pos_raw <= y(2 downto 0) & x(2 downto 0);
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glyph_pos <= to_integer(unsigned(glyph_pos_raw));
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-- actually currently BRG
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rgb <=
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"111111111111111111111111" when current_glyph(glyph_pos) = '1' else
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"000000000000000000000000";
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end logic;
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4
main.vhd
4
main.vhd
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dvi_de => de
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);
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image_generator_i: entity work.image_generator generic map (
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framebuffer: entity work.font_rom generic map (
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input_clk => 48_000_000
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) port map (
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clk => clk_vga,
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x => image_x,
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y => image_y,
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ctrl_up => rotary_up,
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ctrl_down => rotary_down,
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rgb => pixel_rgb
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);
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