anjian.c

avr的按键程序

#include <avr/io.h>
#define  uchar unsigned char
#define  uint  unsigned int

void delay(uint ms)
{
        uint i,j;
	for(i=0;i<ms;i++)
	   {
	   for(j=0;j<2280;j++);
       }
	   return;
}                        

uchar key_press()
{
    uchar j;
     
     DDRD|=0X3C;
	 PORTD|=0X3C;
	 DDRD&=0XC3;
	 delay(10);
	j=PIND;
	j=j&0X3C;
	if(j==0X3C)
	{
	  return 0;
	}
	else
	{
	 return 1;
	}
	
}

uchar key_scan()
{
    uchar key;
  	
	key=PIND;
	key&=0X3C;

 
	switch(key)
	{
	   case 0X38: 
	       key=1;
		   break;
	   case 0X34:
	       key=2;
		   break;
	   	 case 0X2C: 
	       key=3;
		   break;
	   case 0X1C:
	       key=4;
		   break; 
	   default:	
	       key=0;     	   
	}
	 while(key_press());
	
	
	return key;
}

void paomadeng1()
{
  unsigned char a;
	DDRA=0xFF;
	while(key_press()==0)
	{
		for(a=0;a<8;a++)			//循环八次，完成一路跑马灯的亮
		{
			PORTA=~(1<<a);		//简单的移位操作，让PORTA的值左移
			delay(10);			//延时时间与系统的主频有关
		}
	}
	return;	
}


void paomadeng2()
{
   unsigned char a;
	DDRA=0xFF;
	while(key_press()==0)
	{
		for(a=0;a<8;a++)			//循环八次，完成一路跑马灯的亮
		{
			PORTA=~(0X80>>a);		//简单的移位操作，让PORTA的值左移
			delay(10);			//延时时间与系统的主频有关
		}
	}
	return;	
}

void laihui()
{
     unsigned char k,m,n;
    DDRA=0XFF;
   while(key_press()==0)
   {
   
   for(k=1;k<4;k++)
    {
	PORTA=0XFF;
	m=~(0x01<<k);
	n=~(0x80>>k);
	PORTA&=m&n;
	delay(10);
	}
    for(k=3;k>=1;k--)
    {
	PORTA=0XFF;
	m=~(0x01<<(k-1));
	n=~(0x80>>(k-1));
	PORTA&=m&n;
	delay(10);
	} 
   }
   return;
}

int main()
{
    uchar i,l;
    DDRA|=0XFF;
	PORTA=0XFF;	

	while(1)
	{
	  i=key_press();
	    if(i)
	    {
	     l=key_scan();
		 switch(l)
		   {
         	case 1:
		        paomadeng1();
		    	break;
		    case 2:
		    	paomadeng2();
		    	break;
	    	case 3:
			    laihui();
		    	break;
			case 4:
		    	PORTA=0X00;
		    	break;
			}
	    }
	}
}