led.c

基于RAM的外设数据控制器pdc.rar

#include"AT91SAM7S64.H"

//	LED ON
void ledon(unsigned char no)
{
	if(no==1)
		*AT91C_PIOA_CODR|=0x00000001;
	if(no==2)
		*AT91C_PIOA_CODR|=0x00000002;
	if(no==3)
		*AT91C_PIOA_CODR|=0x00000004;

}

//	LED OFF
 void ledoff(unsigned char no)
  {
	if(no==1)
		*AT91C_PIOA_SODR|=0x00000001;
	if(no==2)
		*AT91C_PIOA_SODR|=0x00000002;
	if(no==3)
		*AT91C_PIOA_SODR|=0x00000004;

  }
/*-----------------------------------------------------------------------
延时函数
系统时钟：18.423M
-----------------------------------------------------------------------*/

void delay_nus(unsigned long int n)       //N us延时函数
  {
   unsigned int i;
   unsigned int j;
   for (j=0;j<n;j++)
   {
   for (i=0;i<3;i++);
   }
  }
  
void delay_1ms(unsigned int n)                 //nms延时函数
  {
   unsigned int i;
   unsigned int j;
   for (j=0;j<n;j++)
   {
   for (i=0;i<3000;i++);
   }
  }
//	LED All Off
void ledalloff(void)
{
	*AT91C_PIOA_SODR|=0x00000007;
}


//	LED All On
void ledallon(void)
{
	*AT91C_PIOA_CODR|=0x00000007;
}