单片机控制蜂鸣器唱歌，程序里的speak为什么要取反

只看该作者 · 2012-6-16 10:17

本帖最后由 luabc 于 2012-6-16 10:28 编辑

/********************************************************************
* 文件名  ：蜂鸣器唱歌.c
* 描述 :  该程序实现控制蜂鸣器演奏音乐。
***********************************************************************/
#include<reg52.h>
#define uchar unsigned char
#define uint  unsigned int
uchar Count;
sbit Speak =P1^2;    //蜂鸣器器控制脚　
/*以下数组是音符编码*/
unsigned char code SONG[] ={    //祝你平安
0x26,0x20,0x20,0x20,0x20,0x20,0x26,0x10,0x20,0x10,0x20,0x80,0x26,0x20,0x30,0x20,
0x30,0x20,0x39,0x10,0x30,0x10,0x30,0x80,0x26,0x20,0x20,0x20,0x20,0x20,0x1c,0x20,
0x20,0x80,0x2b,0x20,0x26,0x20,0x20,0x20,0x2b,0x10,0x26,0x10,0x2b,0x80,0x26,0x20,
0x30,0x20,0x30,0x20,0x39,0x10,0x26,0x10,0x26,0x60,0x40,0x10,0x39,0x10,0x26,0x20,
0x30,0x20,0x30,0x20,0x39,0x10,0x26,0x10,0x26,0x80,0x26,0x20,0x2b,0x10,0x2b,0x10,
0x2b,0x20,0x30,0x10,0x39,0x10,0x26,0x10,0x2b,0x10,0x2b,0x20,0x2b,0x40,0x40,0x20,
0x20,0x10,0x20,0x10,0x2b,0x10,0x26,0x30,0x30,0x80,0x18,0x20,0x18,0x20,0x26,0x20,
0x20,0x20,0x20,0x40,0x26,0x20,0x2b,0x20,0x30,0x20,0x30,0x20,0x1c,0x20,0x20,0x20,
0x20,0x80,0x1c,0x20,0x1c,0x20,0x1c,0x20,0x30,0x20,0x30,0x60,0x39,0x10,0x30,0x10,
0x20,0x20,0x2b,0x10,0x26,0x10,0x2b,0x10,0x26,0x10,0x26,0x10,0x2b,0x10,0x2b,0x80,
0x18,0x20,0x18,0x20,0x26,0x20,0x20,0x20,0x20,0x60,0x26,0x10,0x2b,0x20,0x30,0x20,
0x30,0x20,0x1c,0x20,0x20,0x20,0x20,0x80,0x26,0x20,0x30,0x10,0x30,0x10,0x30,0x20,
0x39,0x20,0x26,0x10,0x2b,0x10,0x2b,0x20,0x2b,0x40,0x40,0x10,0x40,0x10,0x20,0x10,
0x20,0x10,0x2b,0x10,0x26,0x30,0x30,0x80,0x00,
                              //路边的野华不要采
0x30,0x1C,0x10,0x20,0x40,0x1C,0x10,0x18,0x10,0x20,0x10,0x1C,0x10,0x18,0x40,0x1C,
0x20,0x20,0x20,0x1C,0x20,0x18,0x20,0x20,0x80,0xFF,0x20,0x30,0x1C,0x10,0x18,0x20,
0x15,0x20,0x1C,0x20,0x20,0x20,0x26,0x40,0x20,0x20,0x2B,0x20,0x26,0x20,0x20,0x20,
0x30,0x80,0xFF,0x20,0x20,0x1C,0x10,0x18,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,
0x20,0x2B,0x40,0x20,0x20,0x1C,0x10,0x18,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,
0x20,0x2B,0x40,0x20,0x30,0x1C,0x10,0x18,0x20,0x15,0x20,0x1C,0x20,0x20,0x20,0x26,
0x40,0x20,0x20,0x2B,0x20,0x26,0x20,0x20,0x20,0x30,0x80,0x20,0x30,0x1C,0x10,0x20,
0x10,0x1C,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,0x20,0x2B,0x40,0x20,0x15,0x1F,
0x05,0x20,0x10,0x1C,0x10,0x20,0x20,0x26,0x20,0x2B,0x20,0x30,0x20,0x2B,0x40,0x20,
0x30,0x1C,0x10,0x18,0x20,0x15,0x20,0x1C,0x20,0x20,0x20,0x26,0x40,0x20,0x20,0x2B,
0x20,0x26,0x20,0x20,0x20,0x30,0x30,0x20,0x30,0x1C,0x10,0x18,0x40,0x1C,0x20,0x20,
0x20,0x26,0x40,0x13,0x60,0x18,0x20,0x15,0x40,0x13,0x40,0x18,0x80,0x00,
};
/********************************************************************
* 名称 : Time0_Init()
* 功能 : 定时器的初始化，定时时间可用光碟中软件计算，11.0592MZ晶振，10ms
* 输入 : 无
* 输出 : 无
***********************************************************************/
void Time0_Init()
{
TMOD = 0x01;
IE = 0x82;
TH0  = 0xDC;
TL0  = 0x00;
}
/********************************************************************
* 名称 : Time0_Int()
* 功能 : 定时器中断，中断中实现 Count 加一
* 输入 : 无
* 输出 : 无
***********************************************************************/
void Time0_Int() interrupt 1
{
TH0 = 0xDC;
TL0 = 0x00;
Count++; //长度加1
}
/********************************************************************
* 名称 : Delay_xMs()
* 功能 : 延时子程序，经过软件调试，测得延时程序大概为55us.
* 输入 : x
* 输出 : 无
***********************************************************************/
void Delay_xMs(uint x)
{
uint i,j;
for(i=0; i<x; i++)
{
      for(j=0; j<3; j++);
}
}
/********************************************************************
* 名称 : Play_Song()
* 功能 : 播放蜂鸣器控制程序
* 输入 : i (选择播放哪首歌曲，0为“祝你平安”，1为“路边的野花你不要采”
* 输出 : 无
***********************************************************************/
void Play_Song(uchar i)
{
uchar Temp1,Temp2;
uint Addr;
Count = 0;    //中断计数器清0
Addr = i * 217;
while(1)
{
  Temp1 = SONG[Addr++];
   if (Temp1 == 0xFF)       //休止符
   {
   TR0 = 0;
   Delay_xMs(100);
   }
   else if (Temp1 == 0x00) //歌曲结束符
   {
   return;
   }
   else
   {
   Temp2 = SONG[Addr++];
   TR0 = 1;
   while(1)
   {
   Speak = ~Speak;
   Delay_xMs(Temp1);
   if(Temp2 == Count)
   {
      Count = 0;
      break;
   }
   }
   }
}
}
/********************************************************************
* 名称 : Main()
* 功能 : 主函数
* 输入 : 无
* 输出 : 无
***********************************************************************/
void Main()
{
Time0_Init(); //定时器0中断初始化
while(1)
{
  Play_Song(1);  //Play_Song(0)为祝你平安 Play_Song(1)为路边的野花你不要裁
}
}

只看该作者 · 2012-6-16 10:25

能不能贴一下图啊

只看该作者 · 2012-6-16 10:26

本帖最后由 luabc 于 2012-6-16 10:30 编辑

突然明白了，这样不停给蜂鸣器加上高低电平，蜂鸣器振动发声，是不是这样？
突然想起以前自己写的让蜂鸣器发声的程序，只是不断给speak赋1和0，虽然可以发声，但是声音很小。
speak取反和给speak赋1和0有什么区别？

想想，其实效果都一样