Hello world

interface2/tests/Makefile

@@ -3,9 +3,10 @@ VVP ?= vvp
 
 RTL = ../rtl
 
-all: coax_tx_tb.vcd
+all: coax_tx_tb.vcd hello_world_tb.vcd
 
 coax_tx_tb: coax_tx_tb.v $(RTL)/coax_tx.v
+hello_world_tb: hello_world_tb.v $(RTL)/hello_world.v $(RTL)/coax_tx.v
 
 clean:
 	rm -f *_tb *.vcd

interface2/tests/hello_world_tb.v

@@ -0,0 +1,32 @@
+`default_nettype none
+
+module hello_world_tb();
+    reg clk = 0;
+
+    initial
+    begin
+        forever
+        begin
+            #1 clk <= ~clk;
+        end
+    end
+
+    wire tx;
+    wire tx_active;
+
+    hello_world dut (
+        .clk(clk),
+        .tx(tx),
+        .tx_active(tx_active)
+    );
+
+    initial
+    begin
+        $dumpfile("hello_world_tb.vcd");
+        $dumpvars(0, hello_world_tb);
+
+        repeat(2000) @(posedge clk);
+
+        $finish;
+    end
+endmodule