code cleanup and font fix

keyboard.sv

@@ -0,0 +1,15 @@
+module keyboard (
+    input wire clk_in,
+    output bit keyboard [15:0]
+    );
+
+    import "DPI-C" function bit [7:0] get_key();
+
+    always_ff @(posedge clk_in) begin
+        bit[7:0] keyval = get_key();
+        if (&keyval != 1) begin
+           keyboard[keyval[3:0]] = keyval[7]; 
+        end
+    end
+
+endmodule