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

* migrate from Travis to GHA

* rework examples

1 files changed, 18 insertions, 0 deletions

diff --git a/examples/icezum/pushbutton.vhdl b/examples/icezum/pushbutton.vhdl
new file mode 100644
index 0000000..55ede2f
--- /dev/null
+++ b/examples/icezum/pushbutton.vhdl
@@ -0,0 +1,18 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity pushbutton is
+  port (
+    sw1, sw2   : in std_logic;
+    led0, led7 : out std_logic
+  );
+end pushbutton;
+
+architecture synth of pushbutton is
+  signal a : std_logic;
+begin
+  a    <= sw1 and sw2;
+  led0 <= a;
+  led7 <= not a;
+end synth;