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        EEPW首頁 > 嵌入式系統(tǒng) > 設(shè)計應(yīng)用 > 基于51單片機的模擬交通燈

        基于51單片機的模擬交通燈

        作者: 時間:2016-12-02 來源:網(wǎng)絡(luò) 收藏
        /*-----------------------------------------------
        注:P1口連接至LED用于顯示紅綠燈,P0口接數(shù)碼管段碼,用于顯示時間;
        兩個74HC573控制段碼和位碼。段碼接P20,位碼接P21
        ------------------------------------------------*/
        #include
        #define uchar unsigned char
        #define uint unsigned int
        sbit DUAN=P2^0;
        sbit WEI=P2^1;
        /*------------------------------------------------
        全局變量
        ------------------------------------------------*/
        bit red,green,yellow,turnred;//定義紅綠黃燈標(biāo)志位

        code unsigned char tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,
        0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00} ;
        //共陰數(shù)碼管0-9
        uchar shi,ge;
        /*------------------------------------------------

        ------------------------------------------------*/
        void delay(uint t)
        {
        while(t--);
        }
        /*------------------------------------------------
        主程序
        ------------------------------------------------*/
        main()
        {
        TMOD |=0x01;
        TH0=(65535-50000)/256;
        TL0=(65535-50000)%256;
        EA=1;//開中斷
        ET0=1;
        TR0=1;//開定時器
        P1=0xfc;//紅燈亮
        red =1;
        while(1)
        {
        WEI=1;
        P0=0xfe;
        WEI=0;
        DUAN=1;
        P0=shi;//顯示十位
        DUAN=0;
        delay(300);

        WEI=1;
        P0=0xfd;
        WEI=0;
        DUAN=1;
        P0=ge;//顯示十位
        DUAN=0;
        delay(300);
        }
        }
        /*------------------------------------------------
        定時器0中斷函數(shù)
        ------------------------------------------------*/
        void tim(void) interrupt 1
        {
        static uchar second=60,count;
        TH0=(65535-50000)/256;
        TL0=(65535-50000)%256;
        count++;
        if (count==20)
        {
        count=0;
        second--;//秒減1
        if(second==0)
        {
        if(red)
        {
        red=0;yellow=1;
        second=5;
        P1=0xF3;//黃燈亮5秒
        }
        else if(yellow && !turnred)
        {
        yellow=0;green=1;
        second=50;
        P1=0xCF;//綠燈亮50秒
        }
        else if(green)
        {
        yellow=1;green=0;
        second=5;
        P1=0xF3;//黃燈亮5秒
        turnred=1;
        }
        else if(yellow && turnred)
        {
        red=1;yellow=0;
        P1=0xFC;//紅燈亮60秒
        second=60;
        turnred=0;
        }
        }
        shi=tab[second/10];
        ge=tab[second%10];

        }
        }


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