C language to realize the keyboard playing，Can perform automatically free play and play two modes

电子琴
......\1
......\1.hex
......\1.lnp
......\1.M51
......\1.plg
......\1.uvopt
......\1.uvproj
......\1_uvproj.bak
......\世上只有妈妈好.c
......\世上只有妈妈好.LST
......\世上只有妈妈好.OBJ
......\串口.c
......\串口.LST
......\串口.OBJ
......\矩阵键盘.c
......\矩阵键盘.LST
......\矩阵键盘.OBJ
......\自由弹奏.c
......\自由弹奏.LST
......\自由弹奏.OBJ

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