key.c

isp1161驱动代码是我下载并该动后而成,还有点缺点,但对你可能有点帮助

void delay(int time)
{ 
        int i;
        for(i=0;i<time;i++);
}

char scanNkey(int n)
{
   int io_temp;
  *(unsigned int*)0x01802000&=0x0ffffffc0;//将此端口设为输出口
   *(unsigned int*)0x01802004|=0x0000003f;
   *(unsigned int*)0x01802004&=~(1<<n);
   
   
   setpio(10,0);
   setpio(10,1);
   setpio(10,0);
  *(unsigned int*)0x01802000|=(1<<9);

  io_temp=readpio(9);     //readpio返回值为0，1
   if(io_temp==0)
      {
         return 1;        //该键按下
      }
    else
      {
         return 0;       //该键没有按下
      }
   
}

char scanAllkey(void)
{
   char t,i;
   char keyval=0x0f;

   for(i=0;i<6;i++)
      {
         t=scanNkey(i);
         if(t==1)
          {
            keyval=i;
            return i; 
          }
               
      }
   
      return keyval;
     
}

char scankey()
{
  char io_temp,t1,t2;
  
  *(unsigned int*)0x01802000&=0x0ffffffc0;//将此端口设为输出口
  *(unsigned int*)0x01802004&=0x0ffffffc0;
  setpio(10,0);
  setpio(10,1);
  setpio(10,0);
  io_temp=readpio(9);
  if(io_temp==1)
     {
        return 0x0f;
     }
  else
    {
      t1=scanAllkey();
      delay(0x4a68);  //延时20ms
      delay(0x4a68);  //延时20ms
      delay(0x4a68);  //延时20ms
      t2=scanAllkey();
      if((t1==t2)&&(t1!=0x0f))
        {
          return t2;
        }
      else
        {
          return 0x0f;
        }
       
    }
  
}