led._c

AtMega169芯片连接RTC的测试程序

#include<iom169v.h>
const unsigned char seg_table[16]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,
0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
unsigned char led_buff[4]={0,0,0,0};
/*				微秒级延时程序	  		*/
void delay_us(int time)
	 {     
  	  do
	  	{
		 time--;
		}	
  	  while (time>1);
	 }	  
/*	  		    毫秒级延时程序			*/	 
void delay_ms(unsigned int time)
	 {
	  while(time!=0)
	  	  {		
		   delay_us(1000);
		   time--;
		  }
	 }					
void display(void)
	 {
	  unsigned char n;
	  DDRE=0xff;
	  PORTE=0xff;
	  DDRB|=0xf0;
	  PORTB|=0xf0;
	  for(n=0;n<3;n++)
	  	 {	
		  
		  PORTE=led_buff[n];
		  PORTB&=~(1<<(n+4));
		  delay_ms(1);
		  PORTB|=0xf0;
		  delay_ms(1);
		  
		 }
	 }