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

* migrate from Travis to GHA

* rework examples

1 files changed, 35 insertions, 0 deletions

diff --git a/examples/icezum/counter.vhdl b/examples/icezum/counter.vhdl
new file mode 100644
index 0000000..9cc4d7e
--- /dev/null
+++ b/examples/icezum/counter.vhdl
@@ -0,0 +1,35 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity counter is
+  port (
+    clk : in std_logic;
+    led0, led1, led2, led3, led4, led5, led6, led7 : out std_logic
+  );
+end counter;
+
+architecture synth of counter is
+  signal clk_6hz : std_logic;
+begin
+  -- Presscaler
+  prescaler: process(clk)
+    variable timer : unsigned (20 downto 0) := (others=>'0');
+  begin
+    if rising_edge(clk) then
+      timer := timer + 1;
+      clk_6hz <= timer(20);
+    end if;
+  end process;
+
+  -- 8 bits counter
+  process (clk_6hz)
+    variable temp : unsigned (7 downto 0);
+  begin
+    if rising_edge(clk_6hz) then
+      temp:= temp + 1;
+      -- Show the counter on the icezum Alhambra leds
+      (led7, led6, led5, led4, led3, led2, led1, led0) <= temp;
+    end if;
+  end process;
+end synth;