MSP430之點燈入門

/***************************************************
程式功能：控制8個LED閃爍，控制燈的流向以及流速
---------------------------------------------------
***************************************************/
#include<msp430x14x.h>

  /*下麵關閉所有的IO口*/
#define close_IO P1DIR = 0XFF;P1OUT = 0XFF; P2DIR = 0XFF;P2OUT = 0XFF;P3DIR = 0XFF;P3OUT = 0XFF;P4DIR = 0XFF;P4OUT = 0XFF; P5DIR = 0XFF;P5OUT = 0XFF;    P6DIR = 0XFF;P6OUT = 0XFF;

typedef unsigned int  uint;

uint i = 0,j = 0,dir = 0;
uint flag = 0,speed = 0;  //flag--燈光流動方式，speed--燈光流動速度

/****************主函數****************/
void main(void)
{
    void P_setting();
    close_IO;
    P_setting();
    _EINT();                        //使能全局中斷
    LPM0;                           //CPU進入LPM0模式
}
/*將設置進行封裝*/
void P_setting(void){
 
    WDTCTL = WDTPW + WDTHOLD;       //關閉看門狗
    P6DIR |= BIT2;P6OUT |= BIT2;    //關閉電平轉換
    P5OUT &= ~BIT7;
    CCTL0 = CCIE;                   //使能CCR0中斷
    CCR0 = 50000;
    
    TACTL = TASSEL_2 + ID_3 + MC_1; //定時器A的時鐘源選擇SMCLK，增計數模式
    P2DIR = 0xff;                   //設置P2口方向為輸出
    P2OUT = 0xff;
    
    }

/*******************************************
函數名稱：Timer_A
功    能：定時器A的中斷服務函數，在這裡通過標誌
          控制流水燈的流動方向和流動速度
********************************************/

#pragma vector = TIMERA0_VECTOR
__interrupt void Timer_A (void)
{
    if(flag == 0)
    {
        P2OUT = ~(0x80>>(i++));    //燈的點亮順序D8 -> D1
    }
    else if(flag == 1)
    {
        P2OUT = ~(0x01<<(i++));    //燈的點亮順序D1 -> D8
    }
    else
    {
        if(dir)                   //燈的點亮順序  D8 -> D1,D1 -> D8,迴圈繞圈                        
        {
            P2OUT = ~(0x80>>(i++));
        }
        else
        {
            P2OUT = ~(0x01<<(i++));
        }
    }
 
    if(i == 8)
    {
        i = 0;
        dir = ~dir;
    }
 
    j++;
    if(j == 40)
    {
        i = 0;
        j = 0;
        flag++;
        if(flag == 4) flag = 0;
        switch(speed)
        {
        case 0:
            TACTL &=~ (ID0 + ID1);    //增計數模式
            TACTL |= ID_3;            //8分頻
            break;
        case 1:
            TACTL &=~ (ID0 + ID1);
            TACTL |= ID_2;              //4分頻
            break;
        case 2:
            TACTL &=~ (ID0 + ID1);
            TACTL |= ID_1;               //2分頻
            break;
        case 3:
            TACTL &=~ (ID0 + ID1);
            TACTL |= ID_0;              //1分頻
            break;
        default:
            break;
        }
        if(flag != 3)   speed++;
        if(speed == 4) speed = 0;
    }
}

《經過測試適用於f149系列》