[stm32l0] Initial support for STM32L0 architecture, Add GPIO peripheral

lib/stm32/l0/gpio.c

@@ -0,0 +1,31 @@
+/** @defgroup gpio_file GPIO
+ *
+ * @ingroup STM32L0xx
+ *
+ * @brief <b>libopencm3 STM32L0xx General Purpose I/O</b>
+ *
+ * @version 1.0.0
+ *
+ * @date 8 September 2014
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/gpio.h>