Lpc2000

Hi,

I'm trying to play with interrupts with Crossworks but I can't get it
working , even with the samples code (timer0 interrupt) .
I debug with Olimex JTAG .
I put a breakpoint on my interrupt ISR but it never breaks on it 
but in the startup code :

"/*****************************************************
 *                                                                   
        *
 * Default exception handlers                                        
        *
 * These are declared weak symbols so they can be redefined in user
code.     * 
 *                                                                   
        *
 *****************************************************/

undef_handler:
  b undef_handler
  
swi_handler:
  b swi_handler
  
pabort_handler:
  b pabort_handler
  
dabort_handler:
  b dabort_handler
  
irq_handler:
  b irq_handler      <-----------------------  BREAKS HERE 
  
fiq_handler:
  b fiq_handler

  .weak undef_handler, swi_handler, pabort_handler, dabort_handler,
irq_handler, fiq_handler



Could someone help me ? 

thx

Yann


PS: I'm a newbie in ARM world ;-) So excuse me if it seems a trivial
question :-P