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#include <lpc23xx.h> void FIQ_Handler(void) {} void Undefined_Handler(void) {} void SWI_Handler(void) {} void IRQ_Handler(void) { if((T0IR &1) ==1){ FIO1PIN2 ^= 0x04; T0IR=1; } } void Prefetch_Handler(void) {} void Abort_Handler(void) {}

#include <lpc23xx.h> #define I_Bit 0x80 #define TIMER0_INT 4 void enableIRQ() { volatile unsigned int _spsr; asm ("MRS %0, SPSR": "=r" (_spsr):); _spsr &= ~I_Bit; asm ("MSR SPSR, %0": :"r" (_spsr)); } int main(void) { SCS |= 1; FIO1DIR = 1 << 18; T0CTCR = 0; T0MR0 = 500000 - 1; T0MCR = 0x3; VICIntSelect &= ~(1<<TIMER0_INT); VICIntEnable |= (1<<TIMER0_INT); // enableIRQ(); T0TCR = 1; while(1); }