单片机其他外围设备的使用

蜂鸣器的使用:

蜂鸣器粗略设定频率,以20ms即50hz发声

#include<reg52.h>

#define uint unsigned int

#define uchar unsigned char

sbit fen = P2^6;

void delay(uint z);

main()

{

    while(1)

    {

        delay(1);//延时10毫秒注意这里输出的是20毫秒的方波

                //因为方波要有正负的跳变才能算一个周期,这里?

                //每隔10毫秒跳变一次,因此周期是200ms,频率是50Hz  

        fen = ~fen;

    }

}



void delay(uint z)

{

    uint x,y;

    for(x=z;x>0;x--)

        for(y=110;y>0;y--);

    

}
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蜂鸣器精确控制发声:使用定时器

#include<reg52.h>

#define  uint unsigned int

#define uchar unsigned char

sbit  fen = P2^6;

uchar num,ben;

void init();

void main()

{

    init();

    while(1);



}



void init()

{

    TMOD = 0x11;

    TH1 = (65536-50000)/256;

    TL1 = (65536-50000)%256;

    ET1 = 1;

    EA = 1;

    TR1 =1;

    

}

void time1()interrupt 3

{

    TH1 = (65536-5000)/256;//定时一次是50毫秒

    TL1 = (65536-5000)%256;

    num++;

    if(num==2)

    {

        num = 0;

        fen = ~fen;

    }



}
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 蜂鸣器精确发声(控制其发出100ms,200ms,300ms,400ms,500ms 的频率

错误代码:

//这个程序调试了一上午吧,感觉有点不对劲,问题是出在  

//定时器的打断上,即两个定时器都在工作的时候,会不会打断原来的定时器

//这个程序实习实现的功能本来是使喇叭发声,发出

//以100ms,200,300,400,500

//本来应该听到5个频率,但是实际只是听到3个,说明中断发生了错位,中断之间产生了相互的影响     

#include<reg52.h>

#define  uint unsigned int

#define uchar unsigned char

sbit  fen = P2^6;

uchar num,flag,tt;

void init();

void main()

{

    init();

    while(1);



}



void init()

{

    TMOD = 0x11;

    TH1 = (65536-50000)/256;

    TL1 = (65536-50000)%256;

    TH0 = (65536-50000)/256;

    TL0 = (65536-50000)%256;

    ET1 = 1;

    ET0 =1;

    EA = 1;

    TR0 =1;

    TR1 =1;



    

}

void time0()interrupt 1

{

    TH0 = (65536-50000)/256;

    TL0 = (65536-50000)%256;

    tt++;

    switch(tt/20)

    {

        case 0:

            flag = 1;

            break;

        case 1:

            flag = 2;

            break;

        case 2:

            flag = 3;

            break;

        case 3:

            flag = 4;

            break;

        case 4:

            tt=0;

            flag = 5;

            break;

    }

}



void time1()interrupt 3

{

    TH1 = (65536-5000)/256;//定时一次是50毫秒

    TL1 = (65536-5000)%256;

    num++;

    if(num==flag)

    {

        num = 0;

        fen = ~fen;

    }



}
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 正确代码

/*                                                          

同时用两个定时器控制蜂鸣器发声,  

定时器0控制频率,定时器1控制同个   

频率持续的时间,间隔2s依次输出  

1,10,50,100,200,400,800,

1k(hz)的方波?

设晶振频率为12MHz。

*/



#include<reg52.h>

#include<intrins.h>

#define uint unsigned int

#define uchar unsigned char

sbit beep = P2^3;

uchar tt;

uint fre,flag;



void main()

{

    fre = 50000;

    beep = 0;

    TMOD = 0x11;

    TH0 = (65536-fre)/256;

    TL0 = (65536-fre)%256;

    TH1 = (65536- 50000)/256;

    TL1 = (65536-50000)%256;

    EA = 1;

    ET0 = 1;

    ET1 =1;

    TR0 =1;

    TR1 = 1;

    while(1);

}



void timer0()interrupt 1

{

    TR0 = 0;//进入中断函数后关闭定时器0,以防止内部程序中断丢失

    TH0 = (65536-50000)/256;

    TL0 = (65536-50000)%256;

    tt ++;

    if(flag<40)

        if(tt==10)

            {

                tt = 0;

                fre = 50000;//分别用fre来选取频率定时50ms,所以中断产生的频率为10hz

                beep = ~beep;

            }

    if(flag>=40&&flag<80)

        {

            tt = 0;

            fre = 50000;//分别用fre来选取频率定时50ms,所以中断产生的频率为10hz

            beep =~beep;

        }

    if(flag>=80&&flag<120)

        {

            tt = 0;

            fre = 10000;//定时10ms,周期为20ms,频率为50hz 

            beep =~beep;

        }

     if(flag>=120&&flag<160)

        {

            tt = 0;

            fre = 5000;//定时5毫秒,周期为10ms,频率为100zh 

            beep =~beep;

        }

     if(flag>=160&&flag<200)

        {

            tt = 0;

            fre = 2500;//定时2.5,周期5ms,频率为200  

            beep =~beep;

        }

          if(flag>=200&&flag<240)

        {

            tt = 0;

            fre = 1250;//定时1.25,周期2.5ms,频率400 

            beep =~beep;

        }

        if(flag>=240&&flag<280)

        {

            tt = 0;

            fre = 625;//定时2.5,周期5ms,频率为800  

            beep =~beep;

        }

        if(flag>=280&&flag<320)

        {

            tt = 0;

            fre = 312;//频率为1600

            beep =~beep;

        }

        if(flag>=320&&flag<360)

        {

            tt = 0;

            fre = 156;//频率为3200

            beep =~beep;

        }

        TR0 = 1;

        

}



void timer1()interrupt 3

{

        TH1 = (65536 - 50000)/256;

        TL1 = (65536 - 50000)%256;

        flag++;

        if(flag == 360)

        {

            flag = 0;

            fre = 50000;

        }

}
View Code

 

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