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各位大侠，帮我看个程序，我用的是IAR5.2编译器，不知道怎么写外部中断，不知道这样写行不，还有IAR里面启动文件时怎么加进来的。

#include <NXP/iolpc2103.h>
#include <intrinsics.h>

__irq __arm void f_in(void); 

#define IRQV 0x18
#pragma vector=IRQV

__irq __arm void irq_handler (void)
{
  void (*interrupt_)();
  unsigned int vector;
 
  vector = VICVectAddr;     // Get interrupt vector.
  interrupt_ = (void(*)())vector;
  if(interrupt_ != 0)
  {
    interrupt_();  // Call vectored interrupt .
  }
  else
  {
    VICVectAddr = 0;      // Clear interrupt in VIC.
  }
}

int main()
{
  __disable_interrupt();
  PINSEL0=  0x00000000;
  PINSEL1 |=0x0000002;
  IODIR |=  0x1<<17;
  IOCLR |=  0x1<<17;
 
  EXTMODE |=0x00;
  EXTPOLAR|=0x00;
 
  VICIntSelect |= 0x00000000;
  VICIntEnClear|= 0xFFFFFFFF;
  VICProtection = 0;
  VICVectAddr   = 0x00000000;
 
  VICIntEnable |=   0x1<<14;
  VICVectCntl0 = 0x20 | 14;
  VICVectAddr0 = (unsigned int)&f_in;
  __enable_interrupt();
  while(1);
 
}

__irq __arm void f_in()
{
/*if((IOPIN&0x00000001)==1)
    IOCLR |= 0x00000001;
  else
    IOSET |= 0x00000001; */
  IOSET |=0x1<<17;
  while((IOPIN&0x00010000)==0);//等待按键放开
  EXTINT |= 0x01;
  VICVectAddr=0x00;
}