migrate from Travis to GHA and rework examples (#78)

* migrate from Travis to GHA

* rework examples

1 files changed, 83 insertions, 0 deletions

diff --git a/examples/icestick/multi1.vhdl b/examples/icestick/multi1.vhdl
new file mode 100644
index 0000000..a304765
--- /dev/null
+++ b/examples/icestick/multi1.vhdl
@@ -0,0 +1,83 @@
+architecture multi1 of leds is
+  signal clk_4hz: std_logic;
+  signal clk_5sec : std_logic;
+  signal leds : std_ulogic_vector (1 to 5);
+begin
+  (led1, led2, led3, led4, led5) <= leds;
+
+  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 <= '1';
+      else
+        counter := counter + 1;
+        clk_4hz <= '0';
+      end if;
+    end if;
+  end process;
+
+  process (clk)
+    variable counter5 : unsigned (4 downto 0);
+  begin
+    if rising_edge (clk) then
+      clk_5sec <= '0';
+      if clk_4hz = '1' then
+        if counter5 = 19 then
+          clk_5sec <= '1';
+          counter5 := "00000";
+        else
+          counter5 := counter5 + 1;
+        end if;
+      end if;
+    end if;
+  end process;
+  
+  process (clk)
+    variable count : unsigned (1 downto 0);
+    variable pat_count : unsigned (0 downto 0);
+  begin
+    if rising_edge(clk) then
+      if clk_4hz = '1' then
+         case pat_count is
+           when "0" =>
+              case count is
+                when "00" =>
+                  leds <= "10001";
+                when "01" =>
+                  leds <= "01000";
+                when "10" =>
+                  leds <= "00101";
+                when "11" =>
+                  leds <= "00010";
+                when others =>
+                  null;
+              end case;
+           when "1" =>
+              case count is
+                when "00" =>
+                  leds <= "10000";
+                when "01" =>
+                  leds <= "01011";
+                when "10" =>
+                  leds <= "00100";
+                when "11" =>
+                  leds <= "01011";
+                when others =>
+                  null;
+              end case;
+           when others =>
+             null;
+         end case;
+         count := count + 1;
+      end if;
+      if clk_5sec = '1' then
+        pat_count := pat_count + 1;
+        count := "00";
+      end if;
+    end if;
+  end process;
+end multi1;