msp430键盘中断扫描程序07.4.3.txt

msp430F149的键盘中断扫描程序

#include <msp430x14x.h>
void Init_Port(void)
{
    //将P1口所有的管脚在初始化的时候设置为输入方式
    P1DIR = 0;
 
    //将P1口所有的管脚设置为一般I/O口
    P1SEL = 0;
    
    // 将P1.4 P1.5 P1.6 P1.7设置为输出方向
    P1DIR |= BIT4;
    P1DIR |= BIT5;
    P1DIR |= BIT6;
    P1DIR |= BIT7;

   //先输出低电平
    P1OUT = 0x00;
   // 将中断寄存器清零
    P1IE = 0;
    P1IES = 0;
    P1IFG = 0;
    //打开管脚的中断功能
    //对应的管脚由高到低电平跳变使相应的标志置位
    P1IE |= BIT0;	
    P1IES|= BIT0;	
    P1IE |= BIT1;	
    P1IES|= BIT1;
    P1IE |= BIT2;	
    P1IES|= BIT2;	
    P1IE |= BIT3;	
    P1IES |= BIT3;
	_EINT();//打开中断
    return;
 }
void Delay(unsigned int k)
{
  while(k--)
  {}
        
}
int KeyProcess(void)
{
       //P5OUT&=0x00;  
       P5OUT=0x00;
       Delay(20);
  unsigned char  nP10,nP11,nP12,nP13;
        nP10=0;
        nP11=0;
        nP12=0;
        nP13=0;
	int nRes = 0;
        
        //P1.7输出低电平
	P1OUT = ~(BIT7);
        Delay(50);
	
        nP10 = P1IN & BIT0;
	if (nP10 == 0) 
        {
          nRes = 13;
          P5OUT|=BIT4;
        }
        
        nP11 = P1IN & BIT1;
	if (nP11 == 0)
        {
          nRes = 14;
          P5OUT|=BIT4;
        }
        
        nP12 = P1IN & BIT2;
	if (nP12 == 0) 
        {
          nRes = 15;
          P5OUT|=BIT4;
        }
	
        nP13 = P1IN & BIT3;
	if (nP13 == 0) 
        {
          nRes = 16;
          //P5OUT=0x00;
          P5OUT|=BIT4;
        }
	
        //P1.6输出低电平  
	P1OUT = ~(BIT6);
        Delay(50);
	
        nP10 = P1IN & BIT0;
	if (nP10 == 0) 
        {
          nRes = 9;
          P5OUT|=BIT5;
        }
	nP11 = P1IN & BIT1;
	if (nP11 == 0) 
        {
          nRes = 10;
          P5OUT|=BIT5;
        }
	
        nP12 = P1IN & BIT2;
	if (nP12 == 0) 
        {  
          nRes = 11;
	  P5OUT|=BIT5;
        }
        
        nP13 = P1IN & BIT3;
	if (nP13 == 0) 
        {
         nRes = 12;
         //P5OUT=0x00;
         P5OUT|=BIT5;
        }
        
        //P1.5输出低电平
	P1OUT = ~(BIT5);
        Delay(50);
	nP10 = P1IN & BIT0;
	if (nP10 == 0) 
        {
          nRes = 5;
          P5OUT|=BIT6;
        }
       
        nP11 = P1IN & BIT1;
	if (nP11 == 0) 
        {
          nRes = 6;
          P5OUT|=BIT6;
        }
	
        nP12 = P1IN & BIT2;
        if (nP12 == 0) 
        {
         nRes = 7;
         P5OUT|=BIT6;
        }
	
        nP13 = P1IN & BIT3;
	if (nP13 == 0) 
        {
          nRes = 8;
          //P5OUT=0x00;
          P5OUT|=BIT6;
        }
	//P1.4输出低电平
        P1OUT = ~(BIT4);
	
        nP10 = P1IN & BIT0;
	if (nP10 == 0) 
        {
         nRes = 1;
	 P5OUT|=BIT7;
        }
       
        nP11 = P1IN & BIT1;
	if (nP11 == 0) 
        {
          nRes = 2;
	  P5OUT|=BIT7;
        }
        
        nP12 = P1IN & BIT2;
	if (nP12 == 0)
        {
          nRes = 3;
          P5OUT|=BIT7;
        }
       
        nP13 = P1IN & BIT3;
	if (nP13 == 0)
        {
          nRes = 4;
          P5OUT|=BIT7;
        }
        

	P1OUT = 0x00;//恢复以前值。

	//读取各个管脚的状态

	for(;;)
	{
          if((P1IN&0x0F)==0x0F )
		{
			
			break;//等待松开按键
		}
	}
   
	return nRes;
}
// 处理来自端口 1 的中断
#pragma vector=PORT1_VECTOR
__interrupt void PORT1_ISR(void) 
{
	Delay(30000);
	KeyProcess();
   if(P1IFG & BIT0)
    {    	
    	P1IFG &= ~(BIT0);// 清除中断标志位
    }
    if(P1IFG & BIT1)
    {
    	P1IFG &= ~(BIT1);// 清除中断标志位
    }
    if(P1IFG & BIT2)
    {
    	P1IFG &= ~(BIT2);// 清除中断标志位
    }
	if(P1IFG & BIT3)
    {
    	P1IFG &= ~(BIT3);// 清除中断标志位
    }
       
}




void Init_CLK(void)
{
    unsigned int i;
    BCSCTL1 = 0X00;			//将寄存器的内容清零
					//XT2震荡器开启
					//LFTX1工作在低频模式
					//ACLK的分频因子为1
					
    do 
    {
	IFG1 &= ~OFIFG;                       // 清除OSCFault标志
	for (i = 0x20; i > 0; i--);                
    }
    while ((IFG1 & OFIFG) == OFIFG);      // 如果OSCFault =1   
					
    BCSCTL2 = 0X00;			//将寄存器的内容清零
    BCSCTL2 += SELM1;		//MCLK的时钟源为TX2CLK，分频因子为1
    BCSCTL2 += SELS;		//SMCLK的时钟源为TX2CLK，分频因子为1
}

void main()
{
 WDTCTL=WDTPW+WDTHOLD;
 Init_CLK();
 P5DIR=0XFF;
 P5SEL=0x00;
 Delay(1000);
 P5OUT&=0x00;
 Init_Port( );
 while(1);
}