#include "reg51.h"
#define uint unsigned int
#define uchar unsigned char
sbit beep = P2^5;
uchar code SONG_TONE[]={212,212,190,212,159,169,212,212,190,212,142,159,
212,212,106,126,159,169,190,119,119,126,159,142,159,0};
uchar code SONG_LONG[]={9,3,12,12,12,24,9,3,12,12,12,24,
9,3,12,12,12,12,12,9,3,12,12,12,24,0};
//延時函數
void DelayMS(uint x)
{
uchar t;
while(x--) for(t=0;t<120;t++);
}
//控制音頻、節拍函數
void PlayMusic()
{
uint i=0,j,k;
while(SONG_LONG[ i]!=0||SONG_TONE[ i]!=0)[ i][ i]
{
for(j=0;j<SONG_LONG[ i]*20;j++) //播放各個音符，SONG_LONG 為拍子長度[ i]
{
beep=~beep;
for(k=0;k<SONG_TONE[ i]/3;k++);//SONG_TONE 延時表決定了每個音符的頻率[ i]
}
DelayMS(10);
i++;
}
}
void main()
{
beep=0;
while(1)
{
PlayMusic(); //播放生日快樂
DelayMS(5000); //播放完后暫停一段時間
}
}
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