小白跟做江科大51单片机之蜂鸣器播放音乐

龙磐子

已于 2024-05-17 11:27:26 修改

阅读量1.4k

点赞数 16

文章标签： 51单片机嵌入式硬件单片机

于 2024-03-01 14:40:37 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_58051657/article/details/136395743

版权

原理部分

最初频率对应图

通过上面这个频率对应表计算每个音中断时长

运算得到中断时长

代码部分

1.引入Delay及Timer0相关文件

2.编写main.c代码

#include <REGX52.H>
#include "Delay.h"
#include "Timer0.h"

//定义蜂鸣器接口

sbit Buzzer=P2^5;

//音符与索引对应表，P：休止符，L：低音，M：中音，H：高音，下划线：升半音符号#

后面那个数字就代表其在freq中对应的值，最终用来控制中断器时长
#define P   0
#define L1   1
#define L1_   2
#define L2   3
#define L2_   4
#define L3   5
#define L4   6
#define L4_   7
#define L5   8
#define L5_   9
#define L6   10
#define L6_   11
#define L7   12
#define M1   13
#define M1_   14
#define M2   15
#define M2_   16
#define M3   17
#define M4   18
#define M4_   19
#define M5   20
#define M5_   21
#define M6   22
#define M6_   23
#define M7   24
#define H1   25
#define H1_   26
#define H2   27
#define H2_   28
#define H3   29
#define H4   30
#define H4_   31
#define H5   32
#define H5_   33
#define H6   34
#define H6_   35
#define H7   36

//此数组是取到全部的音
unsigned int FreqTable[]={
   0,
   63628,63731,63835,63928,64021,64103,64185,64260,64331,64400,64463,64528,
   64580,64633,64684,64732,64777,64820,64860,64898,64934,64968,65000,65030,
   65058,65085,65110,65134,65157,65178,65198,65217,65235,65252,65268,65283,
};

//乐谱，必须使用code，RAM最大128字节
unsigned char code Music[]={
   //音符,时值,

   //1
   P,   4,
   P,   4,
   P,   4,
   M6,   2,
   M7,   2,

   H1,   4+2,
   M7,   2,
   H1,   4,
   H3,   4,

   M7,   4+4+4,
   M3,   2,
   M3,   2,

   //2
   M6,   4+2,
   M5,   2,
   M6, 4,
   H1,   4,

   M5,   4+4+4,
   M3,   4,

   M4,   4+2,
   M3,   2,
   M4,   4,
   H1,   4,

   //3
   M3,   4+4,
   P,   2,
   H1,   2,
   H1,   2,
   H1,   2,

   M7,   4+2,
   M4_,2,
   M4_,4,
   M7,   4,

   M7,   8,
   P,   4,
   M6,   2,
   M7,   2,

   //4
   H1,   4+2,
   M7,   2,
   H1,   4,
   H3,   4,

   M7,   4+4+4,
   M3,   2,
   M3,   2,

   M6,   4+2,
   M5,   2,
   M6, 4,
   H1,   4,

   //5
   M5,   4+4+4,
   M2,   2,
   M3,   2,

   M4,   4,
   H1,   2,
   M7,   2+2,
   H1,   2+4,

   H2,   2,
   H2,   2,
   H3,   2,
   H1,   2+4+4,

   //6
   H1,   2,
   M7,   2,
   M6,   2,
   M6,   2,
   M7,   4,
   M5_,4,


   M6,   4+4+4,
   H1,   2,
   H2,   2,

   H3,   4+2,
   H2,   2,
   H3,   4,
   H5,   4,

   //7
   H2,   4+4+4,
   M5,   2,
   M5,   2,

   H1,   4+2,
   M7,   2,
   H1,   4,
   H3,   4,

   H3,   4+4+4+4,

   //8
   M6,   2,
   M7,   2,
   H1,   4,
   M7,   4,
   H2,   2,
   H2,   2,

   H1,   4+2,
   M5,   2+4+4,

   H4,   4,
   H3,   4,
   H3,   4,
   H1,   4,

   //9
   H3,   4+4+4,
   H3,   4,

   H6,   4+4,
   H5,   4,
   H5,   4,

   H3,   2,
   H2,   2,
   H1,   4+4,
   P,   2,
   H1,   2,

   //10
   H2,   4,
   H1,   2,
   H2,   2,
   H2,   4,
   H5,   4,

   H3,   4+4+4,
   H3,   4,

   H6,   4+4,
   H5,   4+4,

   //11
   H3,   2,
   H2,   2,
   H1,   4+4,
   P,   2,
   H1,   2,

   H2,   4,
   H1,   2,
   H2,   2+4,
   M7,   4,

   M6,   4+4+4,
   P,   4,

   0xFF   //终止标志
};

unsigned char freselect,Musicselect;
void main()
{

   Timer0Init();
   while(1)
   {
       if(Music[Musicselect]!=0xFF)
       {

//选择第几个音
freselect=Music[Musicselect];
Musicselect++;

//选择时长并延时实现
Delay(500/4*Music[Musicselect]);
Musicselect++;

//下面这三行是为了体现抬手的功能，否则声音太密集
           TR0=0; //关闭定时器
           Delay(5);   //音符间短暂停顿
           TR0=1; //打开定时器
       }
       else
       {
           TR0=0;
           while(1);
       }
   }
}

//刚开始1ms会有一次中断
//产生500HZ的频率
void Timer0_Routine() interrupt 1
{
   if(FreqTable[freselect])
   {
       TL0 = FreqTable[freselect]%256;       //设置定时初值
   TH0 = FreqTable[freselect]/256;       //设置定时初值
   Buzzer=!Buzzer;
   }
}

3.结果

蜂鸣器之天空之城