cpu/atmega2560: added CMSIS style defs for timers

cpu/atmega2560/include/atmega2560_regs.h

+/*
+ * Copyright (C) 2016 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     cpu_atmega2560
+ * @{
+ *
+ * @file
+ * @brief       CMSIS style register definitions for the atmega2560
+ *
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ */
+
+#ifndef ATMEGA2560_REGS_H
+#define ATMEGA2560_REGS_H
+
+#include <avr/io.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   Register types
+ * @{
+ */
+#define REG8                    volatile uint8_t
+#define REG16                   volatile uint16_t
+/** @} */
+
+/**
+ * @brief   Timer register map
+ */
+typedef struct {
+    REG8    CRA;            /**< control A */
+    REG8    CRB;            /**< control B */
+    REG8    CRC;            /**< control C */
+    REG8    reserved;       /**< reserved */
+    REG16   CNT;            /**< counter */
+    REG16   ICR;            /**< input capture */
+    REG16   OCR[3];         /**< output compare */
+} mega_timer_t;
+
+/**
+ * @brief    Base register address definitions
+ * @{
+ */
+#define MEGA_TIMER1_BASE        (uint16_t *)(&TCCR1A)
+#define MEGA_TIMER3_BASE        (uint16_t *)(&TCCR3A)
+#define MEGA_TIMER4_BASE        (uint16_t *)(&TCCR4A)
+#define MEGA_TIMER5_BASE        (uint16_t *)(&TCCR5A)
+/** @} */
+
+/**
+ * @brief    Peripheral instances
+ * @{
+ */
+#define MEGA_TIMER1             ((mega_timer_t *)MEGA_TIMER1_BASE)
+#define MEGA_TIMER3             ((mega_timer_t *)MEGA_TIMER3_BASE)
+#define MEGA_TIMER4             ((mega_timer_t *)MEGA_TIMER4_BASE)
+#define MEGA_TIMER5             ((mega_timer_t *)MEGA_TIMER5_BASE)
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ATMEGA2560_REGS_H */
+/** @} */

cpu/atmega2560/include/cpu_conf.h

@@ -7,6 +7,7 @@
  */
 
 /**
+ * @ingroup         cpu_atmega2560
  * @{
  *
  * @file
@@ -19,6 +20,7 @@
 #ifndef __CPU_CONF_H
 #define __CPU_CONF_H
 
+#include "atmega2560_regs.h"
 
 #ifdef __cplusplus
 extern "C" {