请高手帮忙解读一下51单片机音乐代码

Question

#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int

sbit BEEP = P3^7;
uchar code SONG_TONE[]=
{
212,212,190,212,159,169,212,212,190,212,142,159,212,212,106,126,129,169,190,119,119,126,159,142,159,0
};
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
};

void DelayMS(uint ms)
{
uchar t;
while(ms--)
{
for(t=0;t<120;t++);
}
}

void PlayMusic()
{
uint i =0,j,k;
while(SONG_LONG[i]!=0||SONG_TONE[i]!=0)
{
for(j=0;j<SONG_LONG[i]*20;j++)
{
BEEP = ~BEEP;
for(k=0;k<SONG_TONE[i]/3;k++);
}
DelayMS(10);
i++;
}
}

void main()
{
while(1)
{
PlayMusic();
DelayMS(500);
}
}
本人c语言底子有点薄，请高手在各指令后面加上尽量详细的解释，不胜感激！！

Answer 1

/*代码长，还没给分数，这让我也有点懒了*/
#include <reg52.h>
#define uchar unsigned char /*用uchar代替无符号字符*/
#define uint unsigned int /*用uint代替无符号整型*/

sbit BEEP = P3^7; /*用BEEP代替P3^7,即BEEP声明为P3的第7个I/O端口*/

/*下面这几个有点遗忘了，呵呵*/
/*我们根据频率和延时来让机器唱起来的，相当于音乐曲谱里的音标与节拍*/
uchar code SONG_TONE[]=
{
212,212,190,212,159,169,212,212,190,212,142,159,212,212,106,126,129,169,190,119,119,126,159,142,159,0
};
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
};

/*这个是延时*/
void DelayMS(uint ms)
{
uchar t;
while(ms--)
{
for(t=0;t<120;t++);
}
}

/*这个是播放声音代码了*/
void PlayMusic()
{
uint i =0,j,k;
while(SONG_LONG[i]!=0||SONG_TONE[i]!=0)
{
for(j=0;j<SONG_LONG[i]*20;j++)
{
BEEP = ~BEEP;
for(k=0;k<SONG_TONE[i]/3;k++);
}
DelayMS(10);
i++;
}
}

void main()
{
while(1)
{
PlayMusic();
DelayMS(500);
}
}
/*这个在单片机的书上有所提及，你可以去查阅一下*/