Lpc2000

I am putting togther simple SPI routines using an interrupt.  What I 
am see is that, if I put a breakpoint in the SPI ISR, I see the byte 
get spit out and the program breaks where it ought to.  
Pressing "go" repeatadly sends out more bytes.  If I remove the 
breakpoint I expect to see repeated bytes sent out but, alas, I do 
not, I see one byte transmitted and the PC is in the delay loop went 
I stop execution.

Keil uVision 3 (Using the KEIL ARM compiler)
Ulink
IAR Kickstart board

Thanks for the help

Richard


Code:

void VIC_setup (void)  {

  /* The SPI Interrupt is an IRQ   */
  VICIntSelect   &= ~0x400;
  /* Use slot 0 for SPI Interrupt  */
  VICVectCntl0 = 0x2A;
  /* Set address for of ISR in slot 0  */
  VICVectAddr0 = (unsigned long)SPI_IRQ;
  /* Enable SPI Interrupt  */			
  VICIntEnable   = 0x400;			
}

void SPI_IRQ (void) __irq {

  SPI_data = SPDR;		//read data register		
			
  SPINT        = 1;                         // Clear interrupt flag
  VICVectAddr = 0;                         // Acknowledge Interrupt

}

void SPI_setup (void)	
	{
		SPCCR = 200; 	//  spi rate
		SPCR = 0xA0;	// master mode, interrupt enabled
		dummy = SPSR;
	}
void IO_setup (void)//
	{
		IODIR = 0xff; // P0.0..7 defined as Outputs
	    PINSEL0 = 0x5500; // enable spi i/o	
	}

 unsigned char SPI_tfr(unsigned char SPI_data)
 	{
		unsigned char val;

		SPDR = SPI_data;
	
	}


int main (void) {

unsigned char pin;
unsigned long i;

	SPI_setup();
	IO_setup();
	VIC_setup();
 
	pin = 0;

	while (1) {
 
//	if (pin) IOSET = 0x20; else IOCLR = 0x20;

//	pin ^= 1;
	SPI_tfr(0xAA);
	for(i=0; i<3000; i++);	  //kill some time to allow SPI 
interrupt
	
	

	}
}