key.c

仪器源码->基MSP430 OPEN/SHORT C代码,已成功用于工业自动控制 本仪器适应于各种邦定IC电路测试

#include <msp430x13x.h>
//p37      Ok
//p30      Return
//p36      Left
//p31      Right
//p33      Up
//p32      Down

void init_key(void)
{
    //P3DIR &=~0xcf; 
    
    P3DIR &= ~0x03;
    P2DIR &= ~0xf0;    
    
   // P3DIR = 0x10;
    
}

/*******************************************************/
//p37=01111111=7fh  ok       1
//p30=11111110=feh  Return   2
//p36=10111111=bfh  Left     3
//p31=11111101=fdh  Right    4
//p33=11110111=f7h  up       5
//p32=11111011=fbh  down     6
/*******************************************************/
unsigned char read_key_val()
{
    unsigned char key_buff,key_buff1;
    key_buff=P3IN;    
    key_buff1=P2IN;
    key_buff=key_buff|0Xfc;
    key_buff1=key_buff1|0X0f;
        
    if(key_buff==0xff && key_buff1==0xff)    
    {
       key_buff=0xff;
    }
    else if(key_buff1==0xff)
    {
      switch(key_buff)
       {
        case 0xfd :
           key_buff=1;  //ok
           break;    
        case 0xfe :
           key_buff=3;  //left      
           break;                 
        default: break;
        }  
      
    }
    else if(key_buff==0xff)
    {
      switch(key_buff1)
       {
        case 0xef :
           key_buff=2;   //return     
           break;             
        case 0xdf :
           key_buff=4;  //right      
           break;         
        case 0x7f :
           key_buff=5;   //up     
           break;         
        case 0xbf :
           key_buff=6;   //down     
           break;         
        default: break;
        }  
    }
     return key_buff;
}

unsigned char read_key()
{
   unsigned char val,val1,val2;
   unsigned int i;
   val1=read_key_val();
   for(i=0;i<100;i++);
   val2=read_key_val();
   if(val1==val2 && val1!=0xff)
   {
      val=val1;
      while(1)
      {
        if(read_key_val()==0xff) break;      
      }
   }
   else
   {
      val=0xff;
   }
   return val;
}