Hello Everyone
i wrote a code for a barrel shifter and it passes the compilation
but in the simulation it gives me nothing in the output
here is the code:

library ieee;
use ieee.std_logic_1164.all;

Entity barrel_shifter is
Generic(n: integer := 8);
port(inp: in std_logic_vector (7 downto 0);
shifter: in integer range 0 to 1;
output std_logic_vector (7 downto 0)
);
end barrel_shifter;
architecture behave of barrel_shifter is

signal tmp: std_logic_vector(7 downto 0);
begin
process(inp,shifter)
begin
if (shifter = 0) then
tmp <= inp;
else
tmp(0)<='0';
for i in 1 to inp'HIGH loop --for i in 1 to 7 loop;
tmp(i)<=inp(i-1);
end loop;
end if;
end process;
outp<=tmp;
end behave;

can someone explain me why it shows nothing in the simulation?

 

what input vector are you providing to the simulation?

 

It won't show you anything if you won't give it something (a.k.a test-bench which simulate input).