The VHDL code I sent measures the distance using HCSR$04$ and displays it on the BASYS$3$ screen. I want this code to add certain numbers between certain distances and display them on the seven segment display. For example, between $3$ and $6$ cm$,$ add $5$ to the amount, and between $9$ and $12$ cm$,$ add $10.$ so when it detects between $3$ and $6$ cm for $3$ times total amount should be $15.$ In the following code, sw represents the distance which attendet to number.

library IEEE;

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

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

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

$--$ Uncomment the following library declaration if using

$--$ arithmetic functions with Signed or Unsigned values

$--$use IEEE.NUMERIC$\_$STD$.$ALL;

$--$ Uncomment the following library declaration if instantiating

$--$ any Xilinx leaf cells in this code.

$--$library UNISIM;

$--$use UNISIM.VComponents.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;

signal number : integer;

signal amount : integer;

begin

process $($number$)$

begin

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

amount $<=0$;

if number $>=3$ and number $<=5$ then

amount $<=$ amount $+20$;

$--$

elsif number $>=8$ and number $<=10$ then

amount $<=$ amount $+50$;

else

amount $<=$ amount;

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$($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 $<="0000001"$;

end case;

end process;

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

begin

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

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

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

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

end if;

end process;

LED$\_$activating$\_$counter $<=$ refresh$\_$counter$(19$ downto $18)$;

process$($LED$\_$activating$\_$counter$)$

begin

case LED$\_$activating$\_$counter 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$0$;

end case;

end process;

end Behavioral;

The code is not working properly, can you fix it$.$