External Interrupt in LPC1114

Code C - [expand]
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void PIOINT0_IRQHandler(void)
{
  uint32_t regVal;
    unsigned int i,j;
 
    gpioSetValue(0,2,0);
    for(i = 0 ;i < 500; i++)
        for(j = 0; j < 10000; j++);
  gpio0_counter++;
  regVal = gpioIntStatus(0, 1);
  if (regVal)
  {
    p0_1_counter++;
    gpioIntClear(0, 1);
  }     
  return;
}
 
int main(void)
{
    SystemCoreClockUpdate();
 
    gpioInit();                    //initialize gpio clock 
    gpioSetDir(0,1,0);        //set pin 0.1 as input
    gpioSetDir(0,2,1);       //set pin 0.2 as output
    GPIOSetInterrupt(0,1,0,0,1);  //set interrupt on pin 0.1
    gpioIntEnable(0,1);     //enable interrupt
    
    while(1);
}
void gpioInit(void)
{
  /* Enable AHB clock to the GPIO domain. */
    LPC_SYSCON->SYSAHBCLKCTRL |= SYSAHBCLKCTRL_GPIO;
  /* Set up NVIC when I/O pins are configured as external interrupts. */
  NVIC_EnableIRQ(EINT0_IRQn);
  return;
}
void gpioIntEnable(unsigned char portNum,unsigned char bitPos)
{
  switch (portNum)
  {
    case PORT0:
                LPC_GPIO0->IE |= (0x1<<bitPos); 
      break;
    case PORT1:
                LPC_GPIO1->IE |= (0x1<<bitPos); 
      break;
    case PORT2:
                LPC_GPIO2->IE |= (0x1<<bitPos);
      break;
    case PORT3:
                LPC_GPIO3->IE |= (0x1<<bitPos);
      break;
    default:
      break;
  }
  return;
}