MSP430键盘程序

// 此示例程序没有显示，
// 键盘的按键按下引起P1口的中断服务程序,得到键盘的键值,保存到键值队列
// 在其他的中断服务程序中通过键值队列中的数据引导程序的流程
＃i nclude   
unsigned char keybuff[10];
unsigned char keypoint=0; 
void delay(int v)
    {
        while(v!=0)v--;
    }
 
unsigned char key(void)
  {
    unsigned char x=0xff;
    P1DIR=0X0F;
    P1OUT=0X01;                 //扫描第一行
    if((P1IN&0X70)==0X10)       
       x=0;
       else
          if((P1IN&0X70)==0X20)
            x=1;
                else
                  if((P1IN&0X70)==0x40)
                    x=2;
       else 
        {
          P1OUT=0X2;            //扫描第二行
          if((P1IN&0X70)==0X10)
             x=3;
             else
               if((P1IN&0X70)==0X20)
                  x=4;
                    else
                      if((P1IN&0X70)==0x40)
                        x=5;
           else
           {
            P1OUT=0X4;           //扫描第三行
            if((P1IN&0X70)==0X10)
            x=6;
              else
                if((P1IN&0X70)==0X20)
                x=7;
                  else
                  if((P1IN&0X70)==0x40)
                    x=8;
             else 
             {P1OUT=8;           //扫描第四行
             if((P1IN&0X70)==0X10)
       x=9;
       else
          if((P1IN&0X70)==0X20)
            x=10;
                else
                  if((P1IN&0X70)==0x40)
                    x=11;
                    }
             }      
         }    
  return(x);
  }
  
  
unsigned char keyj(void) 
    {unsigned char x;
    P1DIR=0x0f;
    P1OUT=0x0f;        //键盘硬件：P10--P13为行线，最上面一根为P10
    x=(P1IN&0X70);      //         P14--P16为列线，最左边一根为P14，列线下拉
    return(x);          // 无按键，返回 0?;  有按键返回 非0
    }  
     
       
interrupt[PORT1_VECTOR] void port1key(void)
        {
        if(keyj()!=0X00)
           {
           delay(300)  ;   //消抖动
               if(keyj()!=0X0)
                 {
                    keybuff[keypoint]=key();    //按键见键值保存到队列
                    keypoint++;                 //
                    if(keypoint==10)
                         keypoint=0;
                  }
            }
         P1OUT=0X0F;
         P1IFG=0X0;         //清除中断标志
        }

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;  /*   // Stop WDT */
  P1DIR=0XF;
  P1OUT=0XF;
  P1IES=0X0;
  P1IE=0X70;    //列线上升沿允许P1中断
   _EINT();                      /*/ Enable interrupts                 */
  
  while(1)
  { 
  
     LPM0;                   
    _NOP();   
}