add rest of lab3

1 files changed, 60 insertions, 0 deletions

diff --git a/lab3/leddriver.vhd b/lab3/leddriver.vhd
new file mode 100755
index 0000000..f45a15c
--- /dev/null
+++ b/lab3/leddriver.vhd
@@ -0,0 +1,60 @@
+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;
+