void IRQ_Routine(void)
{
    int i;
    IOSET0 = 0x30600000;        //4 LEDs blink
    for(i=0;i<0x0000ffff;i++);
    IOCLR0 = 0x30600000;
    T0IR = 0x01;                //clear interrupt
    VICVectAddr = 0x0000;           //end of interrupt - dummy write
    T0TCR = 0x02;  
    T0TCR = 0x01;            //Added this
}

#include "LPC214x.h"
#define PLOCK 0x400
#define IRQ_MASK 0x00000080
void init(void);
void IRQ_Routine (void)   __attribute__ ((interrupt("IRQ")));
void FIQ_Routine (void)   __attribute__ ((interrupt("FIQ")));
void SWI_Routine (void)   __attribute__ ((interrupt("SWI")));
void UNDEF_Routine (void) __attribute__ ((interrupt("UNDEF")));
unsigned enableIRQ(void);
unsigned disableIRQ(void);
unsigned restoreIRQ(unsigned oldCPSR);

int main(void)
{
    int i;
    unsigned cp;
    IODIR0 = 0x30600000;
    IOCLR0 = 0x30600000;                    //LEDs off
    init();
    T0TCR = 0x02;                           //reset counter
    T0IR = 0xff;
    T0MCR = 0x0003;                         //interrupt and reset on MR0
    T0MR0 = 0x00ffffff;                     //compare-hit count
    VICVectCntl0 = 0x00000024;              //use it for Timer 0 Interrupt:
    VICVectAddr0 = (unsigned)IRQ_Routine;    //set interrupt vector in 0
    VICIntEnable = 0x00000010;              //enable TIMER0 interrupt
    T0TCR = 0x01;                           //enable Timer0
    cp = enableIRQ();
    
    while(1){
        i=0;
        i=1;
    }
}

void IRQ_Routine(void)
{
    int i;
    IOSET0 = 0x30600000;        //4 LEDs blink
    for(i=0;i<0x0000ffff;i++);
    IOCLR0 = 0x30600000;
    T0IR = 0x01;                //clear interrupt
    VICVectAddr = 0;            //end of interrupt - dummy write
}

void init(void)
{
    PLLCFG=0x24;                //set multiplier/divider values
    PLLFEED=0xaa;
    PLLFEED=0x55;
    PLLCON=0x01;                //enable PLL
    PLLFEED=0xaa;
    PLLFEED=0x55;
    while(!(PLLSTAT & PLOCK));  //wait for the PLL to lock to set frequency
    PLLCON=0x3;                 //connect the PLL as the clock source
    PLLFEED=0xaa;
    PLLFEED=0x55;
    MAMCR=0x02;                 //enable MAM
    MAMTIM=0x04;                //set number of clocks for flash memory fetch
    VPBDIV=0x01;                //set peripheral clock(pclk) to system clock(cclk)
}

void FIQ_Routine(void){
    while (1) ; 
}
void SWI_Routine(void){
    while (1) ; 
}
void UNDEF_Routine(void) {
	while (1) ;	
}
static inline unsigned asm_get_cpsr(void)
{
  unsigned long retval;
  asm volatile (" mrs  %0, cpsr" : "=r" (retval) : /* no inputs */  );
  return retval;
}

static inline void asm_set_cpsr(unsigned val)
{
  asm volatile (" msr  cpsr, %0" : /* no outputs */ : "r" (val)  );
}

unsigned enableIRQ(void)
{
  unsigned _cpsr;

  _cpsr = asm_get_cpsr();
  asm_set_cpsr(_cpsr & ~IRQ_MASK);
  return _cpsr;
}

unsigned disableIRQ(void)
{
  unsigned _cpsr;

  _cpsr = asm_get_cpsr();
  asm_set_cpsr(_cpsr | IRQ_MASK);
  return _cpsr;
}

unsigned restoreIRQ(unsigned oldCPSR)
{
  unsigned _cpsr;

  _cpsr = asm_get_cpsr();
  asm_set_cpsr((_cpsr & ~IRQ_MASK) | (oldCPSR & IRQ_MASK));
  return _cpsr;
}

VICVectAddr0 = (unsigned)IRQ_Routine;

VICVectAddr0 = (unsigned)&IRQ_Routine;