Files
HDLfilter/FiltroHDL/array_functions.vhd
2017-03-07 01:18:29 -03:00

55 lines
1.3 KiB
VHDL

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;
package array_functions is
constant MAX_RANGE : integer := 255;
type array_of_integers is array(integer range <>) of integer range -MAX_RANGE to MAX_RANGE;
function array_sum ( K : in array_of_integers )
return integer;
function reorder_array ( K : in array_of_integers ; simetric : in boolean )
return array_of_integers;
end package;
package body array_functions is
function array_sum ( K : in array_of_integers ) return integer is
variable sum : integer := 0;
begin
for i in 0 to K'length-1 loop
sum := sum + K(K'left + i);
end loop;
return sum;
end array_sum;
function reorder_array ( K : in array_of_integers ; simetric : in boolean )
return array_of_integers is
constant M : integer := 1 + 2*((K'length)-1);
constant N : integer := K'length;
variable arr_s : array_of_integers( 0 to M-1 );
variable arr_a : array_of_integers( 0 to N-1 );
begin
if ( simetric ) then
for i in 0 to N-1 loop
arr_s( i ) := K( K'left + i );
end loop;
for i in 1 to N-1 loop
arr_s( n + i - 1 ) := K( K'right - i );
end loop;
return arr_s;
else
for i in 0 to N-1 loop
arr_a( i ) := K( K'left + i );
end loop;
return arr_a;
end if;
end reorder_array;
end array_functions;