lpc1768_LedBlink1.c

#include <lpc17xx.h>   

void delay(unsigned int count)
{
  unsigned int i,j;
  for(i=0;i<count;i++)
  {
    for(j=0;j<5000;j++);
  }
}

/* start the main program */
void main() 
{
    SystemInit();                    //Clock and PLL configuration 
    LPC_PINCON->PINSEL4 = 0x000000; //Configure the Pins for GPIO;
    LPC_GPIO2->FIODIR = 0xffffffff;  //Configure the PORT pins as OUTPUT;

  while(1)
    {

     /* Turn ON all the leds and wait for one second */ 
       LPC_GPIO2->FIOPIN = 0xffffffff;     // Make all the Port pins as high  
       delay(1000);

     /* Turn OFF all the LEDs and wait for one second */ 
       LPC_GPIO2->FIOPIN = 0x00;     // Make all the Port pins as low  
       delay(1000);
    }
}