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Author: Mohamad (Guest)
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HI its my first time here. Iam somehow new to vhdl, using a BASYS2.
here is my top module and my counter + decoder.
The thing i need help with, is that i want to show on the display:

A digit between 0-9 on the first anod.
b on the second anod.
i on the third anod.
t on the fourth anod.

and they have to show at the same time, thats why iam using a counter.
but cant seem to get it working.
please help.

########################################################################
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;


entity Top is
  port(  clk : in std_logic;
       reset : in std_logic;
       enable : in std_logic;
       input1 : in STD_LOGIC_VECTOR (3 downto 0);
        segment : out  STD_LOGIC_VECTOR (7 downto 0);
          anoder : out  STD_LOGIC_VECTOR (3 downto 0));
end Top;

architecture Behavioral of Top is
------------------------------------------------------
component counter is
  port(  clk : in std_logic;
       reset : in std_logic;
       enable : in std_logic;
       count : out std_logic_vector(1 downto 0));
end component;
------------------------------------------------------
component Decoder is
    Port ( input : in  STD_LOGIC_VECTOR (1 downto 0);
        input1 : in  STD_LOGIC_VECTOR (3 downto 0);
           segment : out  STD_LOGIC_VECTOR (7 downto 0);
           anoder : out  STD_LOGIC_VECTOR (3 downto 0));
end component;
------------------------------------------------------
signal s : STD_LOGIC_VECTOR (1 downto 0);

begin
Count : counter port map (clk => clk, reset => reset, enable => enable, 
count => s);
Display : Decoder port map (segment => segment, anoder => anoder, input 
=> s, input1 => input1);

end Behavioral;
########################################################################

library ieee ;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;

entity counter is
port(  clk:  in std_logic;
  reset:  in std_logic;
  enable:  in std_logic;
  count:  out std_logic_vector(1 downto 0)
);
end counter;

architecture Behavioral of counter is

  signal pre_count: std_logic_vector(1 downto 0);

  begin
    process(clk, enable, reset)
    begin
      if reset = '1' then
        pre_count <= "00";
      elsif (clk='1' and clk'event) then
        if enable = '1' then
          pre_count <= pre_count + "1";
        end if;
      end if;
    end process;
    count <= pre_count;
end Behavioral;
########################################################################


library IEEE;
use IEEE.STD_LOGIC_1164.ALL;


entity Decoder is
    Port ( input : in  STD_LOGIC_VECTOR (1 downto 0);
        input1 : in  STD_LOGIC_VECTOR (3 downto 0);
           segment : out  STD_LOGIC_VECTOR (7 downto 0);
           anoder : out  STD_LOGIC_VECTOR (3 downto 0));
end Decoder;

architecture Behavioral of Decoder is

begin

segment      <= "00000011" when input1 = "0000" else -- 0
        "10011111" when input1 = "0001" else -- 1
        "00100101" when input1 = "0010" else -- 2
        "00001101" when input1 = "0011" else -- 3
        "10011001" when input1 = "0100" else -- 4
        "01001001" when input1 = "0101" else -- 5
        "01000001" when input1 = "0110" else -- 6
        "00011111" when input1 = "0111" else -- 7
        "00000001" when input1 = "1000" else -- 8
        "00011001" when input1 = "1001" else -- 9
        "11000001" when input = "10" else -- b
        "11110011" when input = "01" else -- i
        "11100001" when input = "00";     -- t


anoder <= "0111" when input = "11" else
       "1011" when input = "10" else
       "1101" when input = "01" else
       "1110" when input = "00";

end Behavioral;

########################################################################

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