串口通信 PC机向单片机发送命令启动或停止蜂鸣器播放音乐

ID:396671 · 发表于 2018-11-6 21:14

PC机向单片机发送命令启动或停止蜂鸣器播放音乐，
当播放音乐时该怎么停止，这时是播放函数运行中，pc输入数据要等到放完才接受，也就是停不下来
是不是应该换个播放函数？该怎么写？

#include<reg52.h>
#include<string.h>

unsigned char Count;
sbit speak = P3^4;
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};

void Delay_xMs(unsigned int x)
{
unsigned int i,j;
for( i =0;i < x;i++ )
{
      for( j =0;j<3;j++ );
}
}

void Play_Song(unsigned char i)
{
unsigned char Temp1,Temp2;
unsigned int 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;
   }
   }
   }
}
}

void main (void)
{ char a,b=0;
  SCON=0x50;//串行口方式1
  PCON=0x00;//T1初始化,
  TMOD=0x21;//T1设为方式2  T0设为方式1
  TH1=0xFD;//选9600波特,fosc=11.0592MHz
  TR1=1;//启动T1
  IE = 0x82;
  TH0  = 0xD8;
  TL0  = 0xEF;


  while(1)
{
   if(RI)//如果接收到数据,就把接收到的数回发给PC
      { RI=0;//清接收标志
         a=SBUF ;//读串行口数据
         SBUF=a;//把从PC机发送过来的数据返回给PC机
         while(!TI);//没有发送完等待
         TI=0;//清发送完中断标志

   switch(a)
         {
            case 0x00 : P0=0xff; break;
            case 0x01 : P0=0xAA; break;
            case 0x02 : P0=0x00; break;
         case 0x03 : Play_Song(0);break;  //播放
         case 0x04 : P0=0xff;
         TR0 = 1;speak=0;
         break;
         }
   }
  }
}

void Time0_Int() interrupt 1
{
TH0 = 0xD8;
TL0 = 0xEF;
Count++; //长度加1

}

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