无源蜂鸣器播放小星星

#define    L1    63628
#define    L1_S    63731
#define    L2    63835
#define    L2_S    63928
#define    L3    64021
#define    L4    64103
#define    L4_S    64185
#define    L5    64260
#define    L5_S    64331
#define    L6    64400
#define    L6_S    64463
#define    L7    64528
#define    M1    64580
#define    M1_S    64633
#define    M2    64684
#define    M2_S    64732
#define    M3    64777
#define    M4    64820
#define    M4_S    64860
#define    M5    64898
#define    M5_S    64934
#define    M6    64968
#define    M6_S    65000
#define    M7    65030
#define    H1    65058
#define    H1_S    65085
#define    H2    65110
#define    H2_S    65134
#define    H3    65157
#define    H4    65178
#define    H4_S    65198
#define    H5    65217
#define    H5_S    65235
#define    H6    65252
#define    H6_S    65268
#define    H7    65283
#define SPEED 500
#include <REGX52.H>
#include "Timer0.h"
#include "SKey.h"
#include "Nixie.h"
#include "Delay.h"


void sing(unsigned int t , unsigned int  speed);

sbit BEEP = P2^5;

unsigned char KeyN = 0;
unsigned int MIndex = 0;
unsigned int YYF;
unsigned int SPE;

unsigned char  RELOAD[]  = {0x00,0x00};


unsigned int code MUSIC[] = {
    M1,4,
      M1,4,
      M5,4,
      M5,4,  
      M6,4,
      M6,4,
      M5,4+4,   
      M4,4,
      M4,4,
      M3,4,
      M3,4,
      M2,4,
      M2,4,
      M1,4+4,
     
      M5,4,
        M5,4,
        M4,4,
        M4,4,
        M3,4,
        M3,4,
        M2,4+4,
        
      M5,4,
        M5,4,
        M4,4,
        M4,4,
        M3,4,
        M3,4,
        M2,4+4,

    M1,4,
      M1,4,
      M5,4,
      M5,4,  
      M6,4,
      M6,4,
      M5,4+4,   

      M4,4,
      M4,4,
      M3,4,
      M3,4,
      M2,4,
      M2,4,
      M1,4+4,

        
    
      0xFF};







 


void main(){
    
         Timer0Init();
       while(1){
             

              
              YYF = MUSIC[MIndex];
              MIndex++;
              SPE = MUSIC[MIndex];
              if(YYF==0xFF || SPE==0xFF){
                      MIndex = 0;
                      continue;
                }
                sing(YYF,SPE);
              MIndex++;
         
     }


}


void sing(unsigned int t , unsigned int  speed){
 
        RELOAD[0]  =   t%256;
              RELOAD[1]  =   t/256;
              Delay(speed/4 * SPEED);
              RELOAD[0] = 0x00;
              RELOAD[1] = 0x00;
              Delay(5);
          //停止定时器
         // TR0 = 0;

}



void Timer0_Routine() interrupt 1
{
    
     
 
      if(RELOAD[0] != 0x00){
                        
                TL0 = RELOAD[0];        //设置定时初值
                TH0 = RELOAD[1];        //设置定时初值
                BEEP = !BEEP;
        
        }else{
                TL0 = 0xF5;        //设置定时初值
                TH0 = 0xFF;        //设置定时初值
            
        }
    
 }

 1、采用51单片机的Timer0定时器根据改变周期来给蜂鸣器振荡电压。

 2、不同的声调有不同的振动频率。将振动频率转换为计数器的重载值，实现播放音符。

 3、根据每个小节的每个音符的持续时间来确定播放速度。

 

void main(){ Timer0Init();   while(1){ 
    YYF = MUSIC[MIndex];  MIndex++;  SPE = MUSIC[MIndex];  if(YYF==0xFF || SPE==0xFF){  MIndex = 0;  continue;}sing(YYF,SPE);  MIndex++;          }

}

void sing(unsigned int t , unsigned int  speed){         RELOAD[0]  =   t%256;  RELOAD[1]  =   t/256;  Delay(speed/4 * SPEED);  RELOAD[0] = 0x00;  RELOAD[1] = 0x00;  Delay(5);      //停止定时器     // TR0 = 0;
}


void Timer0_Routine() interrupt 1{    if(RELOAD[0] != 0x00){TL0 = RELOAD[0];//设置定时初值TH0 = RELOAD[1];//设置定时初值BEEP = !BEEP;}else{TL0 = 0xF5;//设置定时初值TH0 = 0xFF;//设置定时初值} }