led.c

自己毕业设计的一部分

#include"LPC2294.h"
void DelayNS(unsigned int dly)
{
  unsigned int i;
  for(;dly>0;dly--)
   for(i=0;i<20000;i++);
}
void led(void)
{
	PINSEL2 &=0x00000000;
	IO2DIR |=0xF0000000;
	IO2CLR=0xF0000000;
	IO2SET=0xF0000000;
	while(1)
	{
		unsigned int i;
		unsigned int j=0x80000000;
		for(i=1; i<=2; i++){
			
			IO2CLR=j;
			DelayNS(50);
			IO2SET=j;		
			DelayNS(50);
			j=j>>1;
		}		
	}

}