led.c

at91sam7s64 LED演示程序.

 /************************************************************/
/*	程序说明：LED1，LDE2，LDE3依次亮灭
/************************************************************/
#include "at91sam7s64.h"


void delay(unsigned long int i)
{
	for(;i>0;i--)
	;

}
  void led()
{
	    *AT91C_PIOA_CODR=0x00000001;  //PIOA0输出低电平
		delay(6000000);
			
		*AT91C_PIOA_SODR=0x00000001; //PIOA0输出高电平
		delay(6000000);
		*AT91C_PIOA_CODR=0x00000002;
		delay(6000000);
		*AT91C_PIOA_SODR=0x00000002;
		delay(6000000);
		
		 		
		 *AT91C_PIOA_CODR=0x00000004;
		delay(6000000);
		*AT91C_PIOA_SODR=0x00000004;
		delay(6000000);
		
		}


void port_init()
{
*AT91C_PIOA_PER=0x0000000F;	  	//PIOA0-2作为I/O使用
*AT91C_PIOA_OER=0x0000000F;	   	//PIOA0-2输出使能

}

void main(void)
{
	port_init();
	
	while(1)
	{
	led();
	}
	




}