diff --git a/Core/Inc/sys_app.h b/Core/Inc/sys_app.h
index 8580786..81334a9 100644
--- a/Core/Inc/sys_app.h
+++ b/Core/Inc/sys_app.h
@@ -98,9 +98,9 @@ void GetUniqueId(uint8_t *id);
 
 /**
   * @brief  callback to get the board 32 bits unique ID (LSB)
-  * @retval devAddr Device Address
+  * @param  devAddr Device Address
   */
-uint32_t GetDevAddr(void);
+void GetDevAddr(uint32_t *devAddr);
 
 /* USER CODE BEGIN EFP */
 
diff --git a/Core/Src/sys_app.c b/Core/Src/sys_app.c
index b730f0e..af30454 100644
--- a/Core/Src/sys_app.c
+++ b/Core/Src/sys_app.c
@@ -235,24 +235,21 @@ void GetUniqueId(uint8_t *id)
   /* USER CODE END GetUniqueId_2 */
 }
 
-uint32_t GetDevAddr(void)
+void GetDevAddr(uint32_t *devAddr)
 {
-  uint32_t val = 0;
   /* USER CODE BEGIN GetDevAddr_1 */
 
   /* USER CODE END GetDevAddr_1 */
 
-  val = LL_FLASH_GetUDN();
-  if (val == 0xFFFFFFFF)
+  *devAddr = LL_FLASH_GetUDN();
+  if (*devAddr == 0xFFFFFFFF)
   {
-    val = ((HAL_GetUIDw0()) ^ (HAL_GetUIDw1()) ^ (HAL_GetUIDw2()));
+    *devAddr = ((HAL_GetUIDw0()) ^ (HAL_GetUIDw1()) ^ (HAL_GetUIDw2()));
   }
 
   /* USER CODE BEGIN GetDevAddr_2 */
 
   /* USER CODE END GetDevAddr_2 */
-  return val;
-
 }
 
 /* USER CODE BEGIN EF */