uint8 HAL_KEY_SW_7_PRESS_COUNT = 0;	//global  variable to count the number of key press
#define KEY_PRESS_COUNT_WAIT_TIME  10000
#define KEY_PRESS_COUNT_EVENT     0x0100
#define RESET_TO_FACTORY_EVENT    0x0200

HAL_ISR_FUNCTION( halKeyPort0Isr, P0INT_VECTOR )
{
  HAL_ENTER_ISR();
  if (HAL_KEY_SW_7_PXIFG & HAL_KEY_SW_7_BIT)	//sw7 connected to P0.0
  {
    if(HAL_KEY_SW_7_PRESS_COUNT == 0)   
    {
	//start event to calculate and process the key press count
      osal_start_timerEx (zclSampleDoorLock_TaskID, KEY_PRESS_COUNT_EVENT, KEY_PRESS_COUNT_WAIT_TIME);
    }
    HAL_KEY_SW_7_PRESS_COUNT++;	//increment count on key press
  } 
  HAL_KEY_SW_7_PXIFG = 0;
  HAL_KEY_CPU_PORT_0_IF = 0;
  .
  .
}


//defined in zcl_sampledoorlock.c file 
void zb_HandleOsalEvent( uint16 event )
{
  if( event & KEY_PRESS_COUNT_EVENT)
  {
    osal_stop_timerEx (zclSampleDoorLock_TaskID, KEY_PRESS_COUNT_EVENT);
    Process_Key_Press_Event();
    event &= (~KEY_PRESS_COUNT_EVENT); 
  }
  if( event & RESET_TO_FACTORY_EVENT)	//factory reset microcontroller
  {
    event &= (~RESET_TO_FACTORY_EVENT);  
    zgWriteStartupOptions(ZG_STARTUP_SET, (ZCD_STARTOPT_DEFAULT_NETWORK_STATE | ZCD_STARTOPT_DEFAULT_CONFIG_STATE));
    ZDApp_ResetTimerStart(3000);
  }
}

void Process_Key_Press_Event( void )
{
  if(HAL_KEY_SW_7_PRESS_COUNT == 3)     //set event to factory reset microcontroller when key is pressed 3 times
  {
    osal_set_event ( zclSampleDoorLock_TaskID, RESET_TO_FACTORY_EVENT); //set event to factory reset microcontroller
    HAL_KEY_SW_7_PRESS_COUNT=0;		//reset key press count
  }
  if(HAL_KEY_SW_7_PRESS_COUNT == 5)    
  {
    //do some process
  }
}