count_ones

------------ count_ones ---------
Library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

entity count_ones is
port(
    A       : in std_logic_vector(7 downto 0);
    ones    : out std_logic_vector(3 downto 0));
end count_ones;

architecture structural of count_ones is
begin
    count: process(A)                               -- Counter process initieres
        variable countA : integer;                  -- Counter variabel defineres
        begin
            countA := 0;                            -- Counter varibel resettes
            for index in 7 downto 0 loop            -- Loop som gentager sig 8 gange
                if (A(index) = '1') then            -- Tester om vores A-input er 1 eller ikke
                    countA := countA + 1;           -- Hvis A = 1, så stiger vores counter
                else
                end if;
            end loop;

            ones <= std_logic_vector(to_unsigned(countA, ones'length)); -- Counteren konverteres til en vector,
        end process;                                                    -- da input på bin2hex er en vector
end structural;