cpu/atmega328p: Relocate default timer config

boards/common/atmega/include/periph_conf_atmega_common.h

@@ -53,11 +53,6 @@ extern "C" {
  *
  * @details Only the 16 bit timers are used by xtimer
  *
- * ATmega328p
- * ==========
- * The timer driver only supports the 16-bit timer (Timer1)
- * so this is the only one we can use here.
- *
  * ATmega1281
  * ==========
  * The ATmega1281 has 6 timers. Timer0 and Timer2 are 8 Bit Timers,
@@ -81,16 +76,7 @@ extern "C" {
  * @{
  */
 #ifndef TIMER_NUMOF
-#if defined(CPU_ATMEGA328P)
-    #define TIMER_NUMOF         (1U)
-    #define TIMER_CHANNELS      (2)
-
-    #define TIMER_0             MEGA_TIMER1
-    #define TIMER_0_MASK        &TIMSK1
-    #define TIMER_0_FLAG        &TIFR1
-    #define TIMER_0_ISRA        TIMER1_COMPA_vect
-    #define TIMER_0_ISRB        TIMER1_COMPB_vect
-#elif defined(CPU_ATMEGA1284P)
+#if defined(CPU_ATMEGA1284P)
     #define TIMER_NUMOF         (2U)
     #define TIMER_CHANNELS      (2)
 

cpu/atmega328p/include/default_timer_config.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2015 HAW Hamburg
+ *               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_atmega328p
+ * @{
+ *
+ * @file
+ * @brief           Default timer configuration
+ *
+ * @author          René Herthel <rene-herthel@outlook.de>
+ * @author          Hauke Petersen <hauke.petersen@fu-berlin.de>
+ */
+
+#ifndef DEFAULT_TIMER_CONFIG_H
+#define DEFAULT_TIMER_CONFIG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef TIMER_NUMOF
+#define TIMER_NUMOF         (1U)
+#define TIMER_CHANNELS      (2)
+
+#define TIMER_0             MEGA_TIMER1
+#define TIMER_0_MASK        &TIMSK1
+#define TIMER_0_FLAG        &TIFR1
+#define TIMER_0_ISRA        TIMER1_COMPA_vect
+#define TIMER_0_ISRB        TIMER1_COMPB_vect
+#endif /* TIMER_NUMOF */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* DEFAULT_TIMER_CONFIG_H */
+/** @} */

cpu/atmega328p/include/periph_cpu.h

@@ -68,5 +68,8 @@ enum {
 }
 #endif
 
+#include "periph_conf.h"
+#include "default_timer_config.h"
+
 #endif /* PERIPH_CPU_H */
 /** @} */