gpio_led.c

ARM嵌入式常用模块与综合系统设计实例精讲

#define IOPMOD (*(volatile unsigned *)0x03FF5000)     //IO 口模式注册
#define IOPDATA (*(volatile unsigned *)0x03FF5008)   //IO口数据注册
void Delay(unsigned int);
int Main()
{
	unsigned long LED;
	IOPMOD=0xFFFFFFFF;                                     //将IO口置为输出模式
	IOPDATA=0x01;
	for(;;)
	{
		LED=IOPDATA;
		LED=(LED<<1);
		IOPDATA=LED;
		Delay(10);
		if(!(IOPDATA&0x0F))
			IOPDATA=0x01;
	}
	return(0);
}

void Delay(unsigned int x)                                //时延
{
	unsigned int i,j,k;
	for(i=0;i<=x;i++)
	for(j=0;j<0xff;j++)
	for(k=0;k<0xff;k++);
}