This VHDL code measures the distance with HCSR$04.$ I want to add some values to the amount in specified distances and shows it on seven segment display. The code that I sent always increases $15$ whether sensor dedect in specified distances or not but want to increase $5$ when sensor detect between $3-6$ and $10$ between $9-12.$

can you fix it according to this arrangements.

library IEEE;

use IEEE.STD$\_$LOGIC$\_1164.$ALL;

use IEEE.std$\_$logic$\_$unsigned.all;

use ieee.NUMERIC$\_$STD$.$all;

entity decimal is

Port $($

sw : in std$\_$logic$\_$vector$(15$ downto $0)$;

reset : in std$\_$logic;

clk : in std$\_$logic;

an : out std$\_$logic$\_$vector$(3$ downto $0)$;

led : out std$\_$logic$\_$vector$(6$ downto $0)$

$)$;

end decimal;

architecture Behavioral of decimal is

signal LED$\_$BCD : integer;

signal refresh$\_$counter : std$\_$logic$\_$vector$(19$ downto $0)$;

signal LED$\_$activating$\_$counter : std$\_$logic$\_$vector$(1$ downto $0)$;

signal w$0,$ w$1,$ w$2,$ w$3$ : integer :$=0$;

signal number : integer :$=0$;

signal amount : integer :$=0$;

signal prev$\_$number : integer :$=0$; $--$ To store previous number for comparison

begin

process $($clk$,$ reset$)$

begin

if reset $=\text{'}1\text{'}$ then

refresh$\_$counter $<=($others $=>\text{'}0\text{'})$;

number $<=0$;

amount $<=0$;

prev$\_$number $<=0$;

elsif rising$\_$edge$($clk$)$ then

refresh$\_$counter $<=$ refresh$\_$counter $+1$;

number $<=$ TO$\_$INTEGER$($unsigned$($sw$))$;

$--$ Conditional increment logic

if $($number $>=3$ and number $<=6)$ and not $($prev$\_$number $>=3$ and prev$\_$number $<=6)$ then

amount $<=$ amount $+5$;

elsif $($number $>=9$ and number $<=12)$ and not $($prev$\_$number $>=9$ and prev$\_$number $<=12)$ then

amount $<=$ amount $+10$;

end if;

prev$\_$number $<=$ number; $--$ Update previous number

end if;

end process;

w$3<=$ amount $/1000$;

w$2<=($amount mod $1000)/100$;

w$1<=($amount mod $100)/10$;

w$0<=($amount mod $10)$;

process$($clk$)$

begin

if rising$\_$edge$($clk$)$ then

case refresh$\_$counter$(19$ downto $18)$ is

when $"00"=>$

an $<="0111"$;

LED$\_$BCD $<=$ w$3$;

when $"01"=>$

an $<="1011"$;

LED$\_$BCD $<=$ w$2$;

when $"10"=>$

an $<="1101"$;

LED$\_$BCD $<=$ w$1$;

when $"11"=>$

an $<="1110"$;

LED$\_$BCD $<=$ w$0$;

when others $=>$

null; $--$ Do nothing

end case;

end if;

end process;

$--$ Seven$-$segment display decoder

process$($LED$\_$BCD$)$

begin

case LED$\_$BCD is

when $0=>$ led $<="0000001"$; $--"0"$

when $1=>$ led $<="1001111"$; $--"1"$

when $2=>$ led $<="0010010"$; $--"2"$

when $3=>$ led $<="0000110"$; $--"3"$

when $4=>$ led $<="1001100"$; $--"4"$

when $5=>$ led $<="0100100"$; $--"5"$

when $6=>$ led $<="0100000"$; $--"6"$

when $7=>$ led $<="0001111"$; $--"7"$

when $8=>$ led $<="0000000"$; $--"8"$

when $9=>$ led $<="0000100"$; $--"9"$

when others $=>$ led $<="0000001"$; $--$ Default or error case

end case;

end process;

end Behavioral;