LED Breahing DE0 nano

thank you mr cris72

it's working well

this the vhdl code

library ieee;

USE ieee.std_logic_1164.all;

use ieee.std_logic_arith.all;

use ieee.std_logic_unsigned.all;

ENTITY DE0_NANO IS

PORT( LED : out std_logic_vector(7 downto 0);

KEY : in std_logic_vector(1 downto 0);

CLOCK_50 : in std_logic

);

END DE0_NANO;

ARCHITECTURE behavioral OF DE0_NANO IS

signal reset_n: std_logic;

signal counter: std_logic_vector(26 downto 0);

signal PWM_adj: std_logic_vector(5 downto 0);

Signal PWM_width : std_logic_vector (6 downto 0);

begin

reset_n <= KEY(0);

process(CLOCK_50)is

begin

if(CLOCK_50'event and CLOCK_50 ='1') then

if (reset_n='0') then

counter <= "000000000000000000000000000";

LED(0) <= '0';

else

counter <= counter+'1';

PWM_width <= ('0' & PWM_width(5 downto 0)) + ('0' & PWM_adj);

if(counter(26)='1')then

PWM_adj <= counter(25 downto 20);

else

PWM_adj <= not counter(25 downto 20);

end if;

LED(0) <= not PWM_width(6);

LED(1) <= not PWM_width(6);

LED(2) <= not PWM_width(6);

LED(3) <= not PWM_width(6);

LED(4) <= PWM_width(6);

LED(5) <= PWM_width(6);

LED(6) <= PWM_width(6);

LED(7) <= PWM_width(6);

end if;

end if;

end process;

END behavioral;