1 | library IEEE;
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2 | use IEEE.std_logic_1164.all;
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3 |
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4 | entity vga_core is
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5 | port
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6 | (
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7 | clk_50: in std_logic;
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8 | red: out std_logic_vector(3 downto 0);
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9 | green: out std_logic_vector(3 downto 0);
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10 | blue: out std_logic_vector(3 downto 0);
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11 | hsync: out std_logic;
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12 | vsync: out std_logic
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13 | );
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14 | end vga_core;
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15 |
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16 | architecture vga_core_arch of vga_core is
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17 |
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18 | signal clk: std_logic;
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19 | signal lineCounter: integer:=0;
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20 | signal pixelCounter: integer:=0;
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21 | signal bitmap_lineCounter: integer:=0;
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22 | signal bitmap_pixelCounter: integer:=0;
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23 | signal ascii_a0: std_logic_vector(6 downto 0):= "0011100";
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24 | signal ascii_a1: std_logic_vector(6 downto 0):= "1100011";
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25 | signal ascii_a2: std_logic_vector(6 downto 0):= "1111111";
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26 | signal ascii_a3: std_logic_vector(6 downto 0):= "1000001";
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27 | signal ascii_a4: std_logic_vector(6 downto 0):= "1000001";
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28 |
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29 |
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30 | begin
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31 | vga_clk: process(clk_50)
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32 | begin
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33 | if rising_edge(clk_50) then
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34 | clk <= NOT clk;
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35 | end if;
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36 | end process vga_clk;
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37 | ------------------------------------------------
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38 | vga_testpic: process(clk)
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39 | begin
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40 | if clk = '1' then
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41 |
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42 | pixelCounter <= pixelCounter + 1;
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43 | bitmap_pixelCounter <= bitmap_pixelCounter + 1;
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44 |
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45 | if pixelCounter = 800 then
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46 | pixelCounter <= 0;
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47 | bitmap_pixelCounter <= 0;
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48 | lineCounter <= lineCounter + 1;
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49 | bitmap_lineCounter <= bitmap_lineCounter + 1;
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50 | end if;
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51 |
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52 | if lineCounter = 524 then
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53 | lineCounter <= 0;
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54 | bitmap_lineCounter <= 0;
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55 | end if;
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56 | ------------------------------------------------
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57 | if pixelCounter > 0 AND pixelCounter < 96 then
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58 | hsync <= '0';
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59 | else
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60 | hsync <= '1';
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61 | end if;
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62 |
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63 | if lineCounter > 0 AND lineCounter < 2 then
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64 | vsync <= '0';
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65 | else
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66 | vsync <= '1';
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67 | end if;
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68 | -------------------------------------------------
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69 | if pixelCounter > 112 AND pixelCounter < 752 AND lineCounter > 13 AND lineCounter < 493 then
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70 | red <= "0000";
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71 | green <= "0000";
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72 | blue <= "0000";
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73 |
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74 | if bitmap_lineCounter < 6 then
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75 | if bitmap_pixelCounter < 8 then
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76 | if bitmap_lineCounter = 0 then
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77 | if ascii_a0(bitmap_pixelCounter) = '1' then
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78 | green <= "1111";
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79 | else
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80 | green <= "0000";
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81 | end if;
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82 | end if;
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83 | if bitmap_lineCounter = 1 then
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84 | if ascii_a1(bitmap_pixelCounter) = '1' then
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85 | green <= "1111";
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86 | else
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87 | green <= "0000";
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88 | end if;
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89 | end if;
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90 | if bitmap_lineCounter = 2 then
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91 | if ascii_a2(bitmap_pixelCounter) = '1' then
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92 | green <= "1111";
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93 | else
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94 | green <= "0000";
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95 | end if;
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96 | end if;
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97 | if bitmap_lineCounter = 3 then
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98 | if ascii_a3(bitmap_pixelCounter) = '1' then
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99 | green <= "1111";
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100 | else
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101 | green <= "0000";
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102 | end if;
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103 | end if;
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104 | if bitmap_lineCounter = 4 then
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105 | if ascii_a4(bitmap_pixelCounter) = '1' then
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106 | green <= "1111";
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107 | else
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108 | green <= "0000";
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109 | end if;
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110 | end if;
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111 | end if;
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112 | else
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113 | green <= "0000";
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114 | end if;
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115 | else
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116 | red <= "0000";
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117 | green <= "0000";
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118 | blue <= "0000";
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119 | end if;
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120 | end if;
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121 | end process vga_testpic;
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122 | end architecture vga_core_arch;
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