LED blink with LPC1114 in C

blink-lpc1114.c

#define REGISTER_32(ADDRESS) (*((volatile unsigned int *)(ADDRESS)))
#define SYSAHBCLKCTRL	REGISTER_32(0x40048080)
#define GPIO0DATA	REGISTER_32(0x50003ffc)
#define GPIO0DIR REGISTER_32(0x50008000)

int main()
{
    // Turn on clock for GPIO and IOCON
    SYSAHBCLKCTRL |= (1 << 6) + (1 << 16);
    GPIO0DIR = (1 << 7); // Make PIO0_7 an output
    GPIO0DATA = 0;   // Turn off PIO0 outputs
     
    int n;
    while(1)
    {
        GPIO0DATA = (1 << 7); // Turn on PIO0_7
        n=1000000; while(--n);
        GPIO0DATA = 0;    // Turn off PIO0_7
        n=1000000; while(--n);
        GPIO0DATA = (1 << 7); // Turn on PIO0_7
        n=3000000; while(--n);
        GPIO0DATA = 0;    // Turn off PIO0_7
        n=3000000; while(--n);
    }    
}