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+/*
+    ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @defgroup HAL HAL
+ * @brief   Hardware Abstraction Layer.
+ * @details Under ChibiOS the set of the various device driver interfaces
+ * is called the HAL subsystem: Hardware Abstraction Layer. The HAL is the
+ * abstract interface between ChibiOS applications and hardware.
+ *
+ * @section hal_peripheral interfaces HAL Peripheral Interfaces
+ * These are a particular case of HAL Interfaces since they are an abstraction
+ * of a hardware.
+ */
+
+/**
+ * @defgroup HAL_PERIPHERAL_INTERFACES Peripheral Interfaces
+ * @brief   HAL Peripheral Interfaces.
+ *
+ * @ingroup HAL
+ */