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|
-------------------------------------------
-- decodeur 7 segments
-------------------------------------------
-- ESIEE
-- Creation : A. Exertier, novembre 2004
-- Modification : A. Exertier, decembre 2011
-------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
---------------------------------------------------
-- Parametre generique
---------------------------------------------------
-- active_low : true => segment allume par 0
-- false => segment allume par 1
---------------------------------------------------
-- Entrees/sorties
---------------------------------------------------
-- hexa : entree code hexadacimal (4 bits)
-- abcdefg : sortie 7 segments
-- a : segment horizontal superieur
-- a est le MSB de abcdefg
-- b : segment vertical superieur droit
-- c : segment vertical inferieur droit
-- d : segment horizontal inferieur
-- e : segment vertical indefieur gauche
-- f : segment vertical superieur gauche
-- g : segment horizontal milieu
---------------------------------------------------
entity seven_segment_decoder is
generic (active_low : boolean := true);
port (hexa : in std_logic_vector(3 downto 0);
hex : out std_logic_vector(6 downto 0));
end ;
architecture RTL of seven_segment_decoder is
signal segments : std_logic_vector(hex'range);
signal abcdefg : std_logic_vector(hex'range);
begin
abcdefg <= segments when active_low else not segments;
process(abcdefg) is
begin
for i in hex'range loop
hex(i) <= abcdefg(hex'length-1-i);
end loop;
end process;
process(hexa)
begin
case hexa is
when "0000" => segments <= "0000001"; -- 0
when "0001" => segments <= "1001111"; -- 1
when "0010" => segments <= "0010010"; -- 2
when "0011" => segments <= "0000110"; -- 3
when "0100" => segments <= "1001100"; -- 4
when "0101" => segments <= "0100100"; -- 5
when "0110" => segments <= "0100000"; -- 6
when "0111" => segments <= "0001111"; -- 7
when "1000" => segments <= "0000000"; -- 8
when "1001" => segments <= "0000100"; -- 9
when "1010" => segments <= "0001000"; -- A
when "1011" => segments <= "1100000"; -- B
when "1100" => segments <= "0110001"; -- C
when "1101" => segments <= "1000010"; -- D
when "1110" => segments <= "0110000"; -- E
when "1111" => segments <= "0111000"; -- F
when others => segments <= "1111111";
end case;
end process;
end ;
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