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library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.all;
entity leddriver is
Port ( clk,rst : in STD_LOGIC;
seg : out UNSIGNED(7 downto 0);
an : out UNSIGNED (3 downto 0);
value : in UNSIGNED (15 downto 0));
end leddriver;
architecture Behavioral of leddriver is
signal segments : UNSIGNED (6 downto 0);
signal counter_r : UNSIGNED(17 downto 0) := "000000000000000000";
signal v : UNSIGNED (3 downto 0);
signal dp : STD_LOGIC;
begin
-- decimal point not used
dp <= '1';
seg <= (dp & segments);
with counter_r(17 downto 16) select
v <= value(15 downto 12) when "00",
value(11 downto 8) when "01",
value(7 downto 4) when "10",
value(3 downto 0) when others;
process(clk) begin
if rising_edge(clk) then
counter_r <= counter_r + 1;
case v is
when "0000" => segments <= "0000001";
when "0001" => segments <= "1001111";
when "0010" => segments <= "0010010";
when "0011" => segments <= "0000110";
when "0100" => segments <= "1001100";
when "0101" => segments <= "0100100";
when "0110" => segments <= "0100000";
when "0111" => segments <= "0001111";
when "1000" => segments <= "0000000";
when "1001" => segments <= "0000100";
when "1010" => segments <= "0001000";
when "1011" => segments <= "1100000";
when "1100" => segments <= "0110001";
when "1101" => segments <= "1000010";
when "1110" => segments <= "0110000";
when others => segments <= "0111000";
end case;
case counter_r(17 downto 16) is
when "00" => an <= "0111";
when "01" => an <= "1011";
when "10" => an <= "1101";
when others => an <= "1110";
end case;
end if;
end process;
end Behavioral;
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