diff --git a/cm7/core_cm7_regs.h b/cm7/core_cm7_regs.h
index bb02397..4108e5f 100644
--- a/cm7/core_cm7_regs.h
+++ b/cm7/core_cm7_regs.h
@@ -1840,7 +1840,7 @@ typedef struct
   #endif
   #include CMSIS_NVIC_VIRTUAL_HEADER_FILE
 #else
-  #define NVIC_SetPriorityGrouping    __NVIC_SetPriorityGrouping
+  #define NVIC_SetPriorityGrouping    IntMgr_SetGroupPriority//__NVIC_SetPriorityGrouping
   #define NVIC_GetPriorityGrouping    __NVIC_GetPriorityGrouping
   #define NVIC_EnableIRQ              IntMgr_EnableInterrupt//__NVIC_EnableIRQ
   #define NVIC_GetEnableIRQ           __NVIC_GetEnableIRQ
diff --git a/interrupt_manager.h b/interrupt_manager.h
index 3b69b59..112f323 100644
--- a/interrupt_manager.h
+++ b/interrupt_manager.h
@@ -19,6 +19,14 @@ extern "C" {
 
 #include "device_header.h"
 
+typedef enum
+{
+    NVIC_PRIORITY_GROUP_0                  = ((uint32_t)0x7), /*!< 0 bits for preemption priority, 4 bits for subpriority */
+    NVIC_PRIORITY_GROUP_1                  = ((uint32_t)0x6), /*!< 1 bits for preemption priority, 3 bits for subpriority */
+    NVIC_PRIORITY_GROUP_2                  = ((uint32_t)0x5), /*!< 2 bits for preemption priority, 2 bits for subpriority */
+    NVIC_PRIORITY_GROUP_3                  = ((uint32_t)0x4), /*!< 3 bits for preemption priority, 1 bits for subpriority */
+    NVIC_PRIORITY_GROUP_4                  = ((uint32_t)0x3)  /*!< 4 bits for preemption priority, 0 bits for subpriority */
+} nvic_priority_group_type;
 
 typedef enum
 {