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>>>dir(pyb.Pin.cpu) 'A15', 'A5', 'B10', 'B11', 'B12', 'B13', 'B14', 'B15', 'C0', 'C1', 'C10', 'C11', 'C12', 'C2', 'C8', 'C9', 'D12', 'D13', 'D14', 'D2', 'E2'
是B15，不是PB15，应该是文档写错了，我更改一下。
