[sim] add dummy gpio function/macros in sim

sw/airborne/arch/sim/mcu_periph/gpio_arch.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2013 Felix Ruess <felix.ruess@gmail.com>
+ *
+ * This file is part of paparazzi.
+ *
+ * paparazzi is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * paparazzi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with paparazzi; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * @file arch/sim/mcu_periph/gpio_arch.h
+ *
+ * GPIO dummy function/macros to compile in simulation
+ *
+ */
+
+#ifndef GPIO_ARCH_H
+#define GPIO_ARCH_H
+
+#define gpio_setup_pin_af(port, pin, af, is_output) {}
+#define gpio_setup_pin_analog(port, pin) {}
+#define gpio_enable_clock(port) {}
+#define gpio_set(port, pin) {}
+#define gpio_clear(port, pin) {}
+
+#endif /* GPIO_ARCH_H */