MSP430_X14X按键程序范例

＃i nclude <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(void)
{
int i;
for(i = 100;i–;i > 0) ;//延时一点时间
}
int KeyProcess(void)
{
    int nP10,nP11,nP12,nP13;
int nRes = 0;
//P1.4输出低电平
P1OUT &= ~(BIT4);
nP10 = P1IN & BIT0;
if (nP10 == 0) nRes = 13;
nP11 = P1IN & BIT1;
if (nP11 == 0) nRes = 14;
nP12 = P1IN & BIT2;
if (nP12 == 0) nRes = 15;
nP13 = P1IN & BIT3;
if (nP13 == 0) nRes = 16;
//P1.5输出低电平
P1OUT &= ~(BIT4);
nP10 = P1IN & BIT0;
if (nP10 == 0) nRes = 9;
nP11 = P1IN & BIT1;
if (nP11 == 0) nRes = 10;
nP12 = P1IN & BIT2;
if (nP12 == 0) nRes = 11;
nP13 = P1IN & BIT3;
if (nP13 == 0) nRes = 12;
//P1.6输出低电平
P1OUT &= ~(BIT4);
nP10 = P1IN & BIT0;
if (nP10 == 0) nRes = 5;
nP11 = P1IN & BIT1;
if (nP11 == 0) nRes = 6;
nP12 = P1IN & BIT2;
if (nP12 == 0) nRes = 7;
nP13 = P1IN & BIT3;
if (nP13 == 0) nRes = 8;
//P1.7输出低电平
P1OUT &= ~(BIT4);
nP10 = P1IN & BIT0;
if (nP10 == 0) nRes = 1;
nP11 = P1IN & BIT1;
if (nP11 == 0) nRes = 2;
nP12 = P1IN & BIT2;
if (nP12 == 0) nRes = 3;
nP13 = P1IN & BIT3;
if (nP13 == 0) nRes = 4;

P1OUT = 0x00;//恢复以前值。

//读取各个管脚的状态
nP10 = P1IN & BIT0;
nP11 = P1IN & BIT1;
nP12 = P1IN & BIT2;
nP13 = P1IN & BIT3;
for(;;)
{
   if(nP10 == 1 && nP11 == 1 && nP12 == 1 && nP13 == 1)
   {
    //等待松开按键
    break;
   }
}
return nRes;
}
// 处理来自端口 1 的中断
interrupt [PORT1_VECTOR] void PORT_ISR(void)
{
Delay();
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
}