#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);
unsigned int cp;
int main(void)
{
int i;
IODIR0 = 0x30600000;
IOCLR0 = 0x30600000; //LEDs off
init();
T0TCR = 0x02; //reset counter
T0IR = 0xff;
T0MCR = 0x0003; //interrupt and reset on MR0
T0MR0 = 0x0000ffff; //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
VICVectAddr0 = 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;
}
But that didn't fix it. Still doesn't work. Now, for no apparent reason, the debugger has decided it doesn't want to run the program anymore. 
