EDK project

[raggedstone] / heartbeat / source / heartbeat.vhd

diff --git a/heartbeat/source/heartbeat.vhd b/heartbeat/source/heartbeat.vhd
index 6938e3fd728284888fb00e38c55cd28da4370c28..03180ef0af5ee631ab1a9842584b1c3047f1e386 100644 (file)
--- a/heartbeat/source/heartbeat.vhd
+++ b/heartbeat/source/heartbeat.vhd
@@ -5,13 +5,20 @@ use ieee.std_logic_unsigned.all;
 
 entity heartbeat is
 generic (
-       divider : std_logic_vector(31 downto 0) := X"01F78A40"
+       divider : std_logic_vector(31 downto 0) := "00000000001111101111000101001000"
 );
 
 port (
        clk_i : in std_logic;
        nrst_i : in std_logic;
-       led_o : out std_logic
+       led2_o : out std_logic;
+       led3_o : out std_logic;
+       led4_o : out std_logic;
+       led5_o : out std_logic;
+       led6_o : out std_logic;
+       led7_o : out std_logic;
+       led8_o : out std_logic;
+       led9_o : out std_logic
 );   
 
 end heartbeat;
@@ -20,21 +27,43 @@ architecture rtl of heartbeat is
 begin
 
 process(clk_i, nrst_i)
-variable counter : std_logic_vector(31 downto 0);
-variable state : std_logic := '0';
+variable counter : std_logic_vector(31 downto 0) := "00000000000000000000000000000000";
+variable state : std_logic_vector(7 downto 0) := "00000001";
+variable direction : std_logic := '0';
 begin
 
-if (clk_i'event AND clk_i = '1') then
-       if nrst_i = '0' then
-               counter := (others => '0');
-        else
-               led_o <= state;
+if (rising_edge(clk_i)) then
+--     if nrst_i = '0' then
+--             counter := (others => '0');
+--        else
+               led2_o <= state(0);
+               led3_o <= state(1);
+               led4_o <= state(2);
+               led5_o <= state(3);
+               led6_o <= state(4);
+               led7_o <= state(5);
+               led8_o <= state(6);
+               led9_o <= state(7);
                counter := counter + 1;
                if counter = divider then
-                       state := not state;
+                       if state(3) = '1' then
+                               direction := '1';
+                       end if;
+
+                       if state(0) = '1' then
+                               direction := '0';
+                       end if;
+
+                       if direction = '0' then
+                               state(7 downto 1) := state(6 downto 0);
+                               state(0) := '0';
+                       else
+                               state(6 downto 0) := state(7 downto 1);
+                               state(7) := '0';
+                       end if;
                        counter := (others => '0');
                end if;
-       end if;
+--     end if;
 end if;
 end process;
 end architecture;