#include <LPC21xx.H>


void SPI_ISR (void) __irq;

void main (void)
{
unsigned int result;

PINSEL0 		= 	0x00005500;			//enable SPI0 pins

S0SPCCR			=	0x000000C8;			//Set bit timing
S0SPCR   		=	0x000000A0;			//Master interrupts enabled


VICVectCntl0 		= 	0x0000002A;  			//select a priority slot for a given interrupt
VICVectAddr0 		= 	(unsigned)SPI_ISR;		//pass the address of the IRQ into the VIC slot
VICIntEnable 		= 	0x00000400;			//enable interrupt


result			=	S0SPSR;				//clear the status register prior to transmission
S0SPDR			=	0x00000055;			//write some data


while (1)
{
;
}

}


void SPI_ISR (void) __irq
{
unsigned int result;

result = S0SPSR;			//read and clear the status flags

}