再来个键盘扫描程序

ID:1 · 发表于 2013-5-29 01:36

#include<iom16v.h>
#include<macros.h>
#define uchar unsigned char
#define uint unsigned int

uchar num;

const uchar  table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};

void fm();
void delay(uint z);
void init();
void key();
void display();
void fm();

void main()
{
   init();
   while(1)
   {
            key();
         display();
   }
}

void delay(uint z)//延时函数
{
   uint x,y;
   for(x=z;x>0;x--)
      for(y=110;y>0;y--);
}

void init()//初始化函数
{
   DDRA=0X5C;
   DDRB=0XFF;

   PORTA&=0XFB;
   PORTB=0XFF;
   PORTA|=0X04;
   PORTA&=0XFB;

   PORTA&=0XEF;
// PORTB=0XFF;
   PORTB=0XFE;
   PORTA|=0X10;
   PORTA&=0XEF;
}

void key()
{
   uchar temp;
   DDRD=0XFF;
   PORTD=0XFF;
   PORTD&=0XFE;
   DDRD&=0X0F;
// PORTD&=0XFE;
   temp=PIND;//读数据，判断是否有键按下
   temp=temp&0XF0;

   if(temp!=0XF0)
   {
         delay(10);
         PORTD&=0XFE;
         temp=PIND;
         temp=temp&0XF0;
      if(temp!=0XF0)
      {
               temp=PIND;

            switch(temp)
            {
                  case 0xeE:
                  num=0;
                  break;

                  case 0xdE:
                  num=1;
                  break;

                  case 0xbE:
                  num=2;
                  break;

                  case 0x7E:
                  num=3;
                  break;
            }
      }

      while(temp!=0XF0)
      {
            PORTD&=0XFE;
               temp=PIND;
            temp=temp&0XF0;
            fm();//蜂鸣器函数，由于是有缘蜂鸣器，所以需要一定的频率来驱动才能发声
      }
   }


   DDRD=0XFF;
   PORTD=0XFF;
   PORTD&=0XFD;
   DDRD&=0X0F;
   temp=PIND;
   temp=temp&0XF0;

   if(temp!=0XF0)
   {
         delay(10);
         PORTD&=0XFD;
         temp=PIND;
         temp=temp&0XF0;
      if(temp!=0XF0)
      {
               temp=PIND;

            switch(temp)
            {
                  case 0xeD:
                  num=4;
                  break;

                  case 0xdD:
                  num=5;
                  break;

                  case 0xbD:
                  num=6;
                  break;

                  case 0x7D:
                  num=7;
                  break;
            }
      }

      while(temp!=0XF0)
      {
            PORTD&=0XFD;
               temp=PIND;
            temp=temp&0XF0;
            fm();
      }
   }

   DDRD=0XFF;
   PORTD=0XFF;
   PORTD&=0XFB;
   DDRD&=0X0F;
   temp=PIND;
   temp=temp&0XF0;

   if(temp!=0XF0)
   {
         delay(10);
         PORTD&=0XFB;
         temp=PIND;
         temp=temp&0XF0;
      if(temp!=0XF0)
      {
               temp=PIND;

            switch(temp)
            {
                  case 0xeB:
                  num=8;
                  break;

                  case 0xdB:
                  num=9;
                  break;

                  case 0xbB:
                  num=10;
                  break;

                  case 0x7B:
                  num=11;
                  break;
            }
      }

      while(temp!=0XF0)
      {
            PORTD&=0XFB;
               temp=PIND;
            temp=temp&0XF0;
            fm();
      }
   }

   DDRD=0XFF;
   PORTD=0XFF;
   PORTD&=0XF7;
   DDRD&=0X0F;
   temp=PIND;
   temp=temp&0XF0;

   if(temp!=0XF0)
   {
         delay(10);
         PORTD&=0XF7;
         temp=PIND;
         temp=temp&0XF0;
      if(temp!=0XF0)
      {
               temp=PIND;

            switch(temp)
            {
                  case 0xe7:
                  num=12;
                  break;

                  case 0xd7:
                  num=13;
                  break;

                  case 0xb7:
                  num=14;
                  break;

                  case 0x77:
                  num=15;
                  break;
            }
      }

      while(temp!=0XF0)
      {
            PORTD&=0XF7;
               temp=PIND;
            temp=temp&0XF0;
            fm();
      }
   }

}
void display()//显示函数
{
   PORTA&=0XF7;
PORTB=table[num];
PORTA|=0X08;
PORTA&=0XF7;
}

void fm()
{
   PORTA&=0XBF;
   delay(3);

   PORTA|=0X40;
   delay(1);
}

帐号		自动登录	找回密码
密码			立即注册

再来个键盘扫描程序

相关帖子