led.c

ARM实例程序

#include <stdio.h>
#include <LPC23xx.H>                    /* LPC23xx definitions                */

int main (void) 
{
	int i;

	FIO4DIR  = 0x00000003<<28;
	FIO4MASK = 0x00000000;

	while(1)
	{
		FIO4SET |= (0x00000003<<28);
		for (i=0; i<2000000; i++);

		FIO4CLR |= (0x00000003<<28);
		for (i=0; i<2000000; i++);
	}
}