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I am writing a program to use EXT_INT5 interrupt.  However, it seems not work.  Here is my code:

; Vectors_intr.asm Vector file for interrupt INT11
   .global _vectors    ;global symbols
   .global _c_int00
   .global _vector1
   .global _vector2
   .global _vector3
   .global _vector4
   .global _vector5  ; for INT 5
   .global _vector6
   .global _vector7
   .global _vector8
   .global _vector9  
   .global _vector10
   .global _isrDetection     
   .global _vector12 
   .global _vector13  
   .global _vector14
   .global _vector15

   .ref _c_int00    ;entry address
  

VEC_ENTRY .macro addr   ;macro for ISR
    STW   B0,*--B15
    MVKL  addr,B0
    MVKH  addr,B0
    B     B0
    LDW   *B15++,B0
    NOP   2
    NOP  
    NOP  
   .endm

_vec_dummy:
  B    B3
  NOP  5

 .sect ".vectors"    ;aligned IST section
 .align 1024
_vectors:
_vector0:   VEC_ENTRY _c_int00    ;RESET
_vector1:   VEC_ENTRY _vec_dummy   ;NMI
_vector2:   VEC_ENTRY _vec_dummy   ;RSVD
_vector3:   VEC_ENTRY _vec_dummy
_vector4:   VEC_ENTRY _vec_dummy
_vector5:   VEC_ENTRY _vec_dummy          ;ISR address
_vector6:   VEC_ENTRY _vec_dummy
_vector7:   VEC_ENTRY _vec_dummy
_vector8:   VEC_ENTRY _vec_dummy
_vector9:   VEC_ENTRY _vec_dummy
_vector10:  VEC_ENTRY _vec_dummy
_vector11:  VEC_ENTRY _isrDetection      
_vector12:  VEC_ENTRY _vec_dummy
_vector13:  VEC_ENTRY _vec_dummy
_vector14:  VEC_ENTRY _vec_dummy
_vector15:  VEC_ENTRY _vec_dummy

In the main() program,  the codes looks like:

 GPIO_Config  GPIOcfg={
  GPIO_FMKS(GPGC,  GP0M,   GPIOMODE)     |
  GPIO_FMKS(GPGC,  GPINT0M, PASSMODE)    |
  GPIO_FMKS(GPGC,  GPINTPOL, LOGICTRUE)  |
  GPIO_FMKS(GPGC,  LOGIC,   ORMODE)      |
  GPIO_FMKS(GPGC,  GPINTDV, DELTAMODE),
  
  GPIO_FMKS(GPEN,  GPXEN,  OF(0)),     
  GPIO_FMKS(GPDIR, GPXDIR, OF(0)),    
  GPIO_FMKS(GPVAL, GPXVAL, OF(0)),
  GPIO_FMKS(GPDH,  GPXDH,  OF(0x00)),
  GPIO_FMKS(GPHM,  GPXHM,  OF(0x00)),
  GPIO_FMKS(GPLM,  GPXLM,  OF(0x0)),
  GPIO_FMKS(GPPOL, GPINTXPOL, OF(0))
 };

  hGpio = GPIO_open(GPIO_DEV0, GPIO_OPEN_RESET);
 GPIO_config(hGpio, &GPIOcfg);

 IRQ_setVecs(vectors);
 IRQ_globalDisable();
 IRQ_globalEnable();       /* Globally enable interrupts       */
 for(i=0;i<32;i++)
 {
     IRQ_disable(i);   /* Disable and clear all IRQ events    */
     IRQ_clear(i);     /* except reset and NMI interrupts     */
 }
    IRQ_map(IRQ_EVT_EXTINT4, 11);
    IRQ_reset(IRQ_EVT_EXTINT4);
    IRQ_enable(IRQ_EVT_EXTINT4);

 I've enabled the interrupt individually, also set up the interrupt in the vectors_intr.asm file. The program gets compiled with no errors.   Did I configured the GPIO incorrectly? 

I am very grateful for your any advice or help?