Merge pull request #2955 from gebart/pr/doxygen-fixes

Doxygen fixes

doc/doxygen/Makefile

@@ -2,4 +2,4 @@ doc:
 	doxygen riot.doxyfile
 
 clean:
-	-@rm -rf latex man html
+	-@rm -rf latex man html doxygen_objdb_*.tmp

doc/doxygen/riot.doxyfile

@@ -1981,7 +1981,8 @@ INCLUDE_FILE_PATTERNS  =
 # recursively expanded use the := operator instead of the = operator.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-PREDEFINED             = __attribute__(x)= \
+PREDEFINED             = DOXYGEN \
+                         __attribute__(x)= \
                          ADC_NUMOF \
                          CPUID_ID_LEN \
                          DAC_NUMOF \

drivers/include/netdev/802154.h

@@ -7,7 +7,9 @@
  */
 
 /**
- * @addtogroup  netdev
+ * @defgroup netdev_802154 Network device interface for IEEE 802.15.4 transceivers
+ * @ingroup  netdev
+ * @brief    Network device driver API for IEEE 802.15.4 radio transceivers
  *
  * @{
  * @file

drivers/include/netdev/default.h

@@ -22,11 +22,13 @@
 
 #include "netdev/base.h"
 
+#ifdef DOXYGEN
 /**
- * @def     NETDEV_DEFAULT
- *
  * @brief   Default device as a pointer of netdev_t.
  */
+#define NETDEV_DEFAULT
+#endif
+
 #ifdef MODULE_AT86RF231
 #include "at86rf231.h"