1 files changed, 35 insertions, 0 deletions
diff --git a/icezum/blink/blink.vhdl b/icezum/blink/blink.vhdl
new file mode 100644
index 0000000..9279622
--- /dev/null
+++ b/icezum/blink/blink.vhdl
@@ -0,0 +1,35 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity blink is
+  port (clk : in std_logic;
+        led0, led1, led2, led3, led4, led5, led6, led7 : out std_logic);
+end blink;
+
+architecture synth of blink is
+  signal clk_4hz: std_logic;
+begin
+  process (clk)
+    --  3_000_000 is 0x2dc6c0
+    variable counter : unsigned (23 downto 0);
+  begin
+    if rising_edge(clk) then
+      if counter = 2_999_999 then
+        counter := x"000000";
+        clk_4hz <= not clk_4hz;
+      else
+        counter := counter + 1;
+      end if;
+    end if;
+  end process;
+
+  led0 <= clk_4hz;
+  led1 <= clk_4hz;
+  led2 <= clk_4hz;
+  led3 <= clk_4hz;
+  led4 <= clk_4hz;
+  led5 <= clk_4hz;
+  led6 <= clk_4hz;
+  led7 <= clk_4hz;
+end synth;