-------------------------------------------------------------------------------
--
-- Entity Name: ledbargraph
-- Entity Description: Entity has an 8-bit data input bus (inp),
--                     Entity also has 1 8-bit data output bus (leds)
-- Architecture Name: loop_arch
-- Description: Led bargraph
--                      Outputs number of 1s determined by input switch
--                     For each switch that is set to 1, another led on the led bargraph lights up
--                     If one switch is set to 1, the bottom led lights, if two switches are set to 1, the bottom two leds light and so on
--                      Implemented using dataflow style selectors
--
-- Lab 04
-- Section 1, Bench 8
-- Author: Brian Chen and Greg Parker
--
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;

entity ones_bar_graph is
    port(inp : in std_logic_vector(7 downto 0);
        leds : out std_logic_vector(7 downto 0));
end ones_bar_graph;

architecture loop_arch of ones_bar_graph is
begin
    process (inp)
    begin
        variable led_count : integer := 0;
        for i in 7 downto 0 loop
            if (inp(i)) = '1' then
                led_count <= led_count + 1;
            end if;
        end loop;
        for j in 0 to led_count loop
              leds(i) <= '1';
        end loop;
    end process;
end loop_arch;