cubic cyclonium-LED matrix interface

This is the code that was supplied with the Cubic Cyclonium (LED matrix driver) in a hardware tutorial class. Very simple, just copies the bit across the whole row. For example, if LEDS(0) is high, it turns on the entire top row of the LED matrix.

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

entity LED_DRIVER is

port (

clock : IN std_logic;

resetN : IN std_logic;

LEDS : IN std_logic_vector(7 downto 0);

LED_MATRIX : OUT std_logic_vector(28 downto 0)

);

END LED_DRIVER;

architecture rtl of LED_DRIVER is

SIGNAL COUNTER : unsigned(15 downto 0);

SIGNAL SCANNER : unsigned(20 downto 0);

BEGIN

LED_MATRIX(28 downto 8) <= std_logic_vector(SCANNER);

LED_MATRIX(7 downto 0) <= NOT LEDS;

process(clock,resetN)

begin

if resetN = '0' then

COUNTER <= (others => '0');

SCANNER <= to_unsigned(1,21);

elsif clock = '1' and clock'event then

COUNTER <= COUNTER + 1;

if COUNTER = to_unsigned(0,16) then

SCANNER(20 downto 1) <= SCANNER(19 downto 0);

SCANNER(0) <= SCANNER(20);

else

SCANNER <= SCANNER;

end if;

end if;

end process;

END rtl;