ARM Development Board - LPC2148 - Blinking an LED

#include<LPC21xx.h>
void delay1(int); //define delay function
int main()
{
PINSEL0=0x00000000; //select pins for blinking led
IODIR0=0x00ffffff; //select I/O pins as output
while(1)
{
IOSET0=0x00ffffff; //sets pins high
delay1(1000); //gives 1 SEC delay
IOCLR0=0x00ffffff; //clears pins
delay1(1000); //gives 1 SEC delay
}
}
/* Delay routine; gives an approximate delay in milliseconds */
void delay1(int d) // delay routine
{
int i;
while(d)
{
for(i=0;i<7000;i++){;}
d--;
}
}