几个嵌入式的小例子，44B0测试，Beep音乐程序，LCD测试，RTC实时时钟，TFT文件夹，USB测试，按键控制LED，按键控制LED，音频测试-A few small examples of embedded, 44B0 test, Beep music program, LCD test, RTC real time clock, TFT folder, USB test button control LED, button control LED, audio test