MSP430单片机按键程序_MSP430单片机

MSP430单片机按键程序

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MSP430单片机按键程序

#include <msp430x14x.h>
#include "key.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 > 0;i--) ;//延时一点时间
}
int KeyProcess(void)
{
    int nP10;
    int nP11;
    int nP12;
    int nP13;
    int nRes = 0;
    //P1.4输出低电平
    P1OUT &= ~(BIT4);
    nP10 = P1IN & BIT0;
    if (nP10 == 0) nRes = 13;
    nP11 = (P1IN & BIT1) >> 1;
    if (nP11 == 0) nRes = 14;
    nP12 = (P1IN & BIT2) >> 2;
    if (nP12 == 0) nRes = 15;
    nP13 = (P1IN & BIT3) >> 3;
    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) >> 1;
    if (nP11 == 0) nRes = 10;
    nP12 = (P1IN & BIT2) >> 2;
    if (nP12 == 0) nRes = 11;
    nP13 = (P1IN & BIT3) >> 3;
    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) >> 1;
    if (nP11 == 0) nRes = 6;
    nP12 = (P1IN & BIT2) >> 2;
    if (nP12 == 0) nRes = 7;
    nP13 = (P1IN & BIT3) >> 3;
    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) >> 1;
    if (nP11 == 0) nRes = 2;
    nP12 = (P1IN & BIT2) >> 2;
    if (nP12 == 0) nRes = 3;
    nP13 = (P1IN & BIT3) >> 3;
    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) >> 1;
    nP12 = (P1IN & BIT2) >> 2;
    nP13 = (P1IN & BIT3) >> 3;
    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
#if __VER__ < 200
    interrupt [PORT1_VECTOR] void PORT_ISR(void)
#else
    #pragma vector=PORT1_VECTOR
    __interrupt void PORT_ISR(void)
#endif
{
    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;