练习闪烁._c

基于AVR实验平台下ATMega128芯片实习作业

#include <iom128v.h>
unsigned char porta_temp=0x01;
void delay_1ms(void)         
 {
   unsigned int i;
   for (i=0;i<556;i++);
  }
void delay_nms(unsigned int n)  
{unsigned int i=0;
   for (i=0;i<n;i++)
   delay_1ms();
  }
  void LED_On(int i)
{
	PORTB=~(1<<i);	
	delay_nms(50);}

void main()  
{unsigned int i;
DDRA = 0x00; DDRB = 0xFF; /*定义输入输出*/
PORTA= 0xFF;PORTB= 0xFF;
while(1)
 {PORTB=0XFF;
 while((PINA & 0x01) == 0)
  { 
    for(i=0;(PINA & 0X01) == 0;i++)
    {PORTB=~PORTB;
    delay_nms(50);}
  }
while((PINA & 0x02) == 0)  //判断PA0口的状态  
   {                       
    PORTB = ~porta_temp;    
    delay_nms(50);           
    porta_temp=porta_temp>>1; 
    if(porta_temp == 0)  //右移到为0时重新赋值     
    {porta_temp=0x80;}
   }
while((PINA & 0x04) ==0)
   {  PORTB = ~porta_temp;     
       delay_nms(50);
	   porta_temp=porta_temp<<1;       
	   if(porta_temp == 0)      
      {  porta_temp=0x01;}
	} 
while((PINA & 0x08)==0)
   {  PORTB=~porta_temp;
   delay_nms(50);
   porta_temp=porta_temp<<1; 
   if(porta_temp==0xF0)
   {porta_temp=0x01;}
   
   }
}
}