![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
在自动演奏简易电子琴电路中,PlaySound()函数的作用是播放指定的音调,其代码如下: void PlaySound() { unsigned short i = 0; if((LittleStar[psong] >> 4) == 0) TR0 = 0; else { TH0 = NoteCode[(LittleStar[psong] >> 4) - 1] >> 8; TL0 = NoteCode[(LittleStar[psong] >> 4) - 1]; TR0 = 1; } TR1 = 1; while(TR1); for(i=0;i<3000;i++); } 其中哪一行代码用于开启声音的播放( )