将整数值转换为 ASCII 字符 - VHDL

Question

我需要在 2x16 显示器上显示一些整数值，但显示器只能识别 ASCII 字符。因此，在我向显示器发送一些值之前，我需要将其转换为字符串...有什么想法吗？

非常感谢！

Answer 1

也许 table 查找会有用。将 ASCII 字符存储在某处，并使用一种方法将 ASCII 映射到您的 "Integer." 我想您使用的是标准 INTEGER 类型？无论哪种方式，它当前使用的格式应该能够以某种方式映射到 ASCII（如果尚未映射）。

Answer 2

有办法做到这一点。所以一开始你需要将整数转换为 std_logic_vector 然后将该值转换为 BCD 系统，这样你就有了整数值的每个数字的二进制值。然后只需将每个数字的 ASCII 值保存到 std_logic_vector-s 的数组中，这样就可以显示它们...

type     x_digits is array ( 3 downto 1) of natural;
signal   x_digit_tb : x_digits;
constant d0 : std_logic_vector (7 downto 0) := "00110000"; -- \
constant d1 : std_logic_vector (7 downto 0) := "00110001"; -- ||
constant d2 : std_logic_vector (7 downto 0) := "00110010"; -- ||
constant d3 : std_logic_vector (7 downto 0) := "00110011"; -- ||
constant d4 : std_logic_vector (7 downto 0) := "00110100"; -- \
constant d5 : std_logic_vector (7 downto 0) := "00110101"; --  >> Constant ASCII-binary value of digits 0 to 9
constant d6 : std_logic_vector (7 downto 0) := "00110110"; -- //
constant d7 : std_logic_vector (7 downto 0) := "00110111"; -- ||
constant d8 : std_logic_vector (7 downto 0) := "00111000"; -- ||
constant d9 : std_logic_vector (7 downto 0) := "00111001"; -- //
.
.
  process(CLK)
          ----- Convert X to BCD -----
          if CLK'event and clk = '1' and dX0 = 1 then
                x_shift(7 downto 0) := x_ein_local;
                for l in 0 to 7 loop
                    x_shift := x_shift sll 1;
                    if  l < 7 and x_shift(11 downto 8) > "0100" then
                        x_shift(11 downto  8) := x_shift(11 downto  8) + "0011";
                    end if;
                    if  l < 7 and x_shift(15 downto 12) > "0100" then
                        x_shift(15 downto 12) := x_shift(15 downto 12) + "0011";
                    end if;
                    if  l < 7 and x_shift(19 downto 16) > "0100" then
                        x_shift(19 downto 16) := x_shift(19 downto 16) + "0011";
                    end if;
                end loop;
                x_BCD <= x_shift(19 downto  8);
                x_shift := (others => '0');
                dX0 <= 2;
            ---- Convert X to ASCII --------    
            if CLK'event and clk = '1' and dX0 = 2 then
                for k in 1 to 3 loop
                    case k is
                        when 1 => WW := x_BCD( 3 downto  0);
                        when 2 => WW := x_BCD( 7 downto  4);
                        when 3 => WW := x_BCD(11 downto  8);
                    end case;
                    case WW is
                        when "0000" => x_digit(k) <= d0;
                        when "0001" => x_digit(k) <= d1;
                        when "0010" => x_digit(k) <= d2;
                        when "0011" => x_digit(k) <= d3;
                        when "0100" => x_digit(k) <= d4;
                        when "0101" => x_digit(k) <= d5;
                        when "0110" => x_digit(k) <= d6;
                        when "0111" => x_digit(k) <= d7;
                        when "1000" => x_digit(k) <= d8;
                        when "1001" => x_digit(k) <= d9;
                        when others => null;
                    end case;   
                end loop;
                dX0 <= 3;
            end if;
        end if;
 end process;

x_digits中保存的值是可以显示的ASCII值...

将整数值转换为 ASCII 字符 - VHDL

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