標題: 經(jīng)典單片機兩定時器控制呼吸燈程序與Proteus仿真 [打印本頁]

作者: 天意如是    時間: 2021-2-4 16:09
標題: 經(jīng)典單片機兩定時器控制呼吸燈程序與Proteus仿真



單片機源程序如下:
#include <reg52.h>

#define        uchar  unsigned char  
#define        uint   unsigned int
#define        ulong  unsigned long

ulong cnt;
uint  cnt_T1,   high,  low;
uchar TH0_H, TL0_H,  TH0_L,  TL0_L,  T1H1,    T1L1,  flag = 0;
uchar duty[19] = {5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95};
sbit out = P3^7;

uchar shuying = 0;


void delay_fy(uchar fy, uchar dy);

void time_1(uchar ms);

void sm_du(uchar dy);


void main()

{

    TMOD = 0X11;    //  定時器0/1都工作在方式1,是2^16計數(shù)

    EA=1;

    delay_fy(100, 5);

    time_1(50);

    while(1);

}



void delay_fy(uchar fy, uchar dy)   // 輸入頻率fy,占空比dy

{

    cnt =  (11059200/fy)/12;        //  要產(chǎn)生頻率為fy,定時器0所要計的數(shù)值

    high = (cnt*dy)/100;            //  計算出高電平所要計的數(shù)值

    low = cnt - high;               //  計算出低電平所要計的數(shù)值

    high = 65536 - high;            //  確定定時器0,從哪個初值開始計時,記錄的是高電平

    low = 65536 - low;              //  確定定時器0,從哪個初值開始計時,記錄的是低電平

    TH0_H = (uchar)(high>>8);    //  高電平,給TH0預(yù)備重裝初值

    TL0_H = (uchar)high;         //  高電平,給TL0預(yù)備重裝初值

    TH0_L = (uchar)(low>>8);      //  低電平,給TH0預(yù)備重裝初值

    TL0_L = (uchar)low;           //  低電平,給TL0預(yù)備重裝初值

    TH0 = TH0_H;

    TL0 = TL0_H;

    out = 1;               

    ET0 = 1;

    TR0 = 1;

}



void time_1(uchar ms)

{

    ulong temp;

    temp =  11059200/1000;

    temp = (temp*ms)/12;

    cnt_T1 = 65536 - temp;

    T1H1 = (uchar)(cnt_T1>>8);

    T1L1 = (uchar)cnt_T1;

    TH1 = T1H1;

    TL1 = T1L1;

    ET1=1;

    TR1=1;

}



void sm_du(uchar dy)

{

    high = (cnt*dy)/100;

    low = cnt - high;

    high = 65536 - high;

    low  = 65536 - low;
}

void time_0() interrupt 1

{

    if(out==0)  //  準備產(chǎn)生高電平

    {

        TH0 = TH0_H;         //  高電平產(chǎn)生  初值重裝

        TL0 = TL0_H;

        out = 1;

    }

    else

    {

        TH0 = TH0_L;         //  低電平產(chǎn)生  初值重裝

        TL0 = TL0_L;

        out = 0;

    }

}



void T1_Timer1() interrupt 3

{

    TH1 = T1H1;

    TL1 = T1L1;

    sm_du(duty[shuying]);

    if(0 == flag)   //  flag=0時,表示呼吸燈由暗變亮

    {

        shuying++;

        if(shuying >=18)

        {

            flag = 1;

        }

    }


    }

}

詳見附件
經(jīng)典兩定時器控制呼吸燈001.rar (16.56 KB, 下載次數(shù): 20)







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