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问题1:调用bulkTransfer返回-1
connection.controlTransfer( 0x40, 0x03,0x0034, 0, null, 0, 0) // connection.controlTransfer(0x40, 0x04, 0x0008, 0, null, 0, 0) connection.bulkTransfer(epIn, buffer, 64, 0)
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