功能

//1.在oled屏上面显示出年月日，小时，分钟，秒，可以通过按键来调整时间

//

//2.一个闹钟功能，通过按键设置闹钟的时间，到点了需要蜂鸣器响和LED闪烁

//

//3.一个倒计时，跟闹钟差不多，也是通过按键设置时间，到时间了LED闪烁

接线

//OLED----MSP430

//VCC-----3.3V

//GND-----GND

//D0------P3.2

//D1------P3.0

//RES-----P2.0

//DC------P2.2

//CS------P8.1

部分代码

cpp
    memset(buf, 0, sizeof(buf));
    sprintf(buf, "m%d ", mode);
    OLED_ShowString(100, 16, buf, 16);
    memset(buf, 0, sizeof(buf));
    sprintf(buf, "%02d:%02d:%02d", alarm_h, alarm_m, alarm_s);
    OLED_ShowString(0, 32, buf, 16);
    memset(buf, 0, sizeof(buf));
    sprintf(buf, "%02d:%02d:%02d", DJS_h, DJS_m, DJS_s);
    OLED_ShowString(0, 48, buf, 16);
    OLED_Refresh_Gram();         //Update display to OLED
    while (1)
    {
        if ((P2IN & BIT1) == 0)
        {
            if ((P2IN & BIT1) == 0)
            {
                mode++;
                if (mode == 14)
                    mode = 0;
                memset(buf, 0, sizeof(buf));
                sprintf(buf, "m%d ", mode);
                OLED_ShowString(100, 16, buf, 16);
//                while ((P2IN & BIT1) == 0)
//                    ;
            }
        }
        else if ((P1IN & BIT1) == 0)
        {
            if ((P1IN & BIT1) == 0)
            {
                if (mode == 1)
                {
                    RTCCTL01 = RTCHOLD + RTCMODE + RTCTEV_0; //关闭RTC
                    RTCYEAR++;
                    if (RTCYEAR == 2030)
                        RTCYEAR = 2010;
                    RTCCTL0 |= RTCRDYIE; /* RTCRDY中断使能 */
                    RTCCTL01 &= ~RTCHOLD; //打开RTC
                }
                else if (mode == 2)
                {
                    RTCCTL01 = RTCHOLD + RTCMODE + RTCTEV_0; //关闭RTC
                    RTCMON++;
                    if (RTCMON == 13)
                        RTCMON = 1;
                    RTCCTL0 |= RTCRDYIE; /* RTCRDY中断使能 */
                    RTCCTL01 &= ~RTCHOLD; //打开RTC
                }
                else if (mode == 3)
                {
                    RTCCTL01 = RTCHOLD + RTCMODE + RTCTEV_0; //关闭RTC
                    RTCDAY++;
                    if (RTCDAY == 31)
                        RTCDAY = 1;
                    RTCCTL0 |= RTCRDYIE; /* RTCRDY中断使能 */
                    RTCCTL01 &= ~RTCHOLD; //打开RTC
                }
                else if (mode == 4)
                {
                    RTCCTL01 = RTCHOLD + RTCMODE + RTCTEV_0; //关闭RTC
                    RTCHOUR++;
                    if (RTCHOUR == 24)
                        RTCHOUR = 0;
                    RTCCTL0 |= RTCRDYIE; /* RTCRDY中断使能 */
                    RTCCTL01 &= ~RTCHOLD; //打开RTC
                }
                else if (mode == 5)
                {
                    RTCCTL01 = RTCHOLD + RTCMODE + RTCTEV_0; //关闭RTC
                    RTCMIN++;
                    if (RTCMIN == 60)
                        RTCMIN = 0;
                    RTCCTL0 |= RTCRDYIE; /* RTCRDY中断使能 */
                    RTCCTL01 &= ~RTCHOLD; //打开RTC
                }
                else if (mode == 6)
                {
                    RTCCTL01 = RTCHOLD + RTCMODE + RTCTEV_0; //关闭RTC
                    RTCSEC++;
                    if (RTCSEC == 60)
                        RTCSEC = 0;
                    RTCCTL0 |= RTCRDYIE; /* RTCRDY中断使能 */
                    RTCCTL01 &= ~RTCHOLD; //打开RTC
                }
                else if (mode == 7)
                {
                    alarm_h++;
                    if (alarm_h == 24)
                        alarm_h = 0;
                }
                else if (mode == 8)
                {
                    alarm_m++;
                    if (alarm_m == 60)
                        alarm_m = 0;
                }
                else if (mode == 9)
                {
                    alarm_s++;
                    if (alarm_s == 60)
                        alarm_s = 0;
                }
                else if (mode == 10)
                {
                    DJS_h++;
                    if (DJS_h == 24)
                        DJS_h = 0;
                }
                else if (mode == 11)
                {
                    DJS_m++;
                    if (DJS_m == 60)
                        DJS_m = 0;
                }
                else if (mode == 12)
                {
                    DJS_s++;
                    if (DJS_s == 60)
                        DJS_s = 0;
                }
                else if (mode == 13)
                {
                    //开始倒计时
                    DJS_IFG = 0;
                    DJS_start = 1;
                }
//                while ((P1IN & BIT1) == 0)
//                    ;
            }
        }
        memset(buf, 0, sizeof(buf));
        sprintf(buf, "%02d:%02d:%02d", alarm_h, alarm_m, alarm_s);
        OLED_ShowString(0, 32, buf, 16);
        memset(buf, 0, sizeof(buf));
        sprintf(buf, "%d-%02d-%02d", nian, yue, ri);
        OLED_ShowString(0, 0, buf, 16);
        memset(buf, 0, sizeof(buf));
        sprintf(buf, "%02d:%02d:%02d", shi, fen, miao);
        OLED_ShowString(0, 16, buf, 16);
        memset(buf, 0, sizeof(buf));
        sprintf(buf, "%02d:%02d:%02d", DJS_h, DJS_m, DJS_s);
        OLED_ShowString(0, 48, buf, 16);
        OLED_Refresh_Gram(); //Update display to OLED
        //闹钟闪烁灯
        if (alarm_ifg == 1)
        {
            P1OUT ^= BIT0;
            delay_ms(50);
        }
        //倒计时
        if (DJS_IFG == 1)
        {
            P4OUT ^= BIT7;
            delay_ms(50);
        }
    }
}
// Timer0 A0 interrupt service routine
#pragma vector=TIMER0_A0_VECTOR
__interrupt void TIMER0_A0_ISR(void)
{
    int DJS = 0;
    if (DJS_start == 1)
    {
        DJS = DJS_h * 3600 + DJS_m * 60 + DJS_s; //倒计时多少秒
        if (DJS > 0)
        {
            DJS--;
            DJS_h = DJS / 3600;
            DJS_m = DJS % 3600 / 60;
            DJS_s = DJS % 3600 % 60;
        }
        else
        {
            DJS_start = 0; //不开始了
            DJS_IFG = 1; //倒计时结束标志
            DJS_time = 10; //闹腾10s
            BEEPOPEN; //打开PWM
        }
    }
    if (DJS_IFG == 1)
    {
        if (DJS_time > 0)
        {
            DJS_time--; //闹钟时间10s
        }
        else if (DJS_time == 0)
        {
            DJS_IFG = 0; //关闭定时器结束标志
            BEEPCLOSE; //关PWM
            P4OUT &= ~(BIT7); //关灯0
        }
    }
    if (alarm_ifg == 1)
    {
        if (alarm_time > 0)
        {
            alarm_time--; //闹钟时间10s
        }
        else if (alarm_time == 0)
        {
            alarm_ifg = 0; //关闭闹钟
            BEEPCLOSE; //关PWM
            P1OUT &= ~(BIT0); //关灯0
        }
    }
}

全部代码

cpp
https://docs.qq.com/sheet/DUEdqZ2lmbmR6UVdU?tab=BB08J2