external interrupt setup

Hi all,
I am using STR912FAW44 core.
I am trying to get an external interrupt from GPIO6.2 pin. There is a problem with my configuration, but I do not know where I am wrong. Could you tell me where I am wrong. My external initialization function as follows.

void externalInt_init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  WIU_InitTypeDef WIU_InitStructure;


  SCU_AHBPeriphClockConfig(__VIC,ENABLE);
  VIC_DeInit();

  SCU_APBPeriphClockConfig(__WIU, ENABLE);
  WIU_DeInit();

  SCU_APBPeriphClockConfig(__GPIO6, ENABLE);
  GPIO_DeInit(GPIO6);

  /* GPIO6  pin configuration */
  GPIO_DeInit(GPIO6);
  GPIO_StructInit(&GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;//|GPIO_Pin_1|GPIO_Pin_0;
  //GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull;//GPIO_Type_OpenCollector ;
  GPIO_Init (GPIO6, &GPIO_InitStructure);

  // Enable the WIU & Clear the WIU line 18 pending bit
  WIU_Cmd(ENABLE );
  WIU_ClearITPendingBit(WIU_Line18);

  //WIU_DeInit();
  WIU_InitStructure.WIU_Line = WIU_Line18 ;
  WIU_InitStructure.WIU_TriggerEdge =  /*WIU_RisingEdge;*/WIU_FallingEdge ;
  WIU_Init(&WIU_InitStructure);

  // Select WIU line 18 as VIC1.12 interrupt source
  SCU_WakeUpLineConfig(18);

  //Configure and enable the interrupt controller
  // VIC_DeInit();

  //VIC_InitDefaultVectors();
  // Configure the External interrupt group 2 priority
  VIC_Config(EXTIT2_ITLine, VIC_IRQ, 1);
  // Enable the External interrupt group 2
  VIC_ITCmd(EXTIT2_ITLine, ENABLE);
}

ISR as follows

void EXTIT2_IRQHandler(void)
{




        WIU_ClearITPendingBit(WIU_Line18);
        printf("ext18\n");




}