經典單片機兩定時器控制呼吸燈程序與Proteus仿真

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電梯直達

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ID:882829 發表于 2021-2-4 16:09 | 只看該作者 |只看大圖回帖獎勵

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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

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;       //  要產生頻率為fy，定時器0所要計的數值

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

low = cnt - high;             //  計算出低電平所要計的數值

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預備重裝初值

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

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

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

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)  //  準備產生高電平

{

      TH0 = TH0_H;       //  高電平產生  初值重裝

      TL0 = TL0_H;

      out = 1;

}

else

{

      TH0 = TH0_L;       //  低電平產生  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;

      }

}

}

}

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