LED Breahing DE0 nano

is this program make led dimming from 0 to 100 % brightness ?

PWM_width <= ('0' & PWM_width(5 downto 0)) + ('0' & PWM_adj); -- 0-100% --

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

PWM_adj <= counter(25 downto 20); -- 0-100% --

else

PWM_adj <= not counter(25 downto 20);

end if;

i try to change range in pwm_adj from 25 downto 20 i think that mean dimming from 0 -100% brightness

then i change it to 23 down to 20 then it's dimming about 0-50% brightness

if i want to want led dimming just only 50% (not from 0 to 50% )what should i do with the counter ??

PWM_width <= ('0' & PWM_width(5 downto 0)) + ('0' & PWM_adj); -- 0-50% --

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

PWM_adj <= counter(23 downto 20); -- 0-50% --

else

PWM_adj <= counter(23 downto 20);

end if;

LED(0) <= PWM_width(6);

LED(1) <= PWM_width(6);

LED(2) <= PWM_width(6);

LED(3) <= PWM_width(6);