sw: outline of serial device

Signed-off-by: Sean Cross <sean@xobs.io>

sw/src/main.c

@@ -41,6 +41,9 @@ int main(int argc, char **argv)
     while (1)
     {
         usb_poll();
+        if (cdc_connected()) {
+            tester_poll();
+        }
     }
     return 0;
 }