diff --git a/arch/avr/src/at32uc3/at32uc3_timerisr.c b/arch/avr/src/at32uc3/at32uc3_timerisr.c
index 7630f03d0b5..f8738d39e70 100644
--- a/arch/avr/src/at32uc3/at32uc3_timerisr.c
+++ b/arch/avr/src/at32uc3/at32uc3_timerisr.c
@@ -119,7 +119,7 @@
 
 static void rtc_waitnotbusy(void)
 {
-  while ((getreg32(AVR32_RTC_CTRL) & RTC_CTRL_BUSY) == 0);
+  while ((getreg32(AVR32_RTC_CTRL) & RTC_CTRL_BUSY) != 0);
 }
 
 /****************************************************************************
diff --git a/arch/avr/src/common/up_allocateheap.c b/arch/avr/src/common/up_allocateheap.c
index 62be64338e8..675352d5e75 100644
--- a/arch/avr/src/common/up_allocateheap.c
+++ b/arch/avr/src/common/up_allocateheap.c
@@ -68,10 +68,9 @@
  * Name: up_allocate_heap
  *
  * Description:
- *   The heap may be statically allocated by
- *   defining CONFIG_HEAP_BASE and CONFIG_HEAP_SIZE.  If these
- *   are not defined, then this function will be called to
- *   dynamically set aside the heap region.
+ *   The heap may be statically allocated by defining CONFIG_HEAP_BASE and 
+ *   CONFIG_HEAP_SIZE.  If these are not defined, then this function will be
+ *   called to dynamically set aside the heap region.
  *
  ****************************************************************************/