liushuideng.c

来自「LPC2103的第一个实验：流水灯」· C语言 代码 · 共 33 行

#include <LPC21XX.H>
/*----------------------------
ebedded system test1:流水灯
Author:Late Lee
Date:09-4-4
-----------------------------*/
void delay(int i)
{
	for (i=500000;i>=0;i--);
}
int main(void)
{
	unsigned int i;
	IO0DIR|=0x3ff; 	// output
	IO0SET|=0x3ff;	// high
	while (1)
	{
		for (i=1;i<0x200;i<<=1)
		{
			IO0CLR|=i;  	//low 
			delay(10000);
			IO0SET|=i;	// high
		}
		for (i=0x200;i>1;i>>=1)
		{
			IO0CLR|=i;	// low
			delay(10000);
			IO0SET+=i;	// high
		}	
	}
//	return 0;	// why can't put here??????
}