Android usb设备设置波特率

Question

如何手动将波特率57600设置为我的USB连接？我试着这样做：

if ($result->num_rows > 0) {
    $return = array();
    while($row = $result->fetch_assoc()) {
        $return[] = array('customer' => $row["name"]);
    }
    echo json_encode($return);
} else {
    echo "0 results";
} 

但它没有用 - 收到的是UsbConnector connector = new UsbConnector(getApplicationContext(), device, listener); if (device != null) { connector.run(); UsbDeviceConnection usbDeviceConnection = usbManager.openDevice(device); usbDeviceConnection.controlTransfer(0x40, 0, 0, 0, null, 0, 0);// reset usbDeviceConnection.controlTransfer(0x40, 0, 1, 0, null, 0, 0);// clear Rx usbDeviceConnection.controlTransfer(0x40, 0, 2, 0, null, 0, 0);// clear Tx usbDeviceConnection.controlTransfer(0x40, 0x03, 0x0034, 0, null, 0, 0);//Baud rate 57600) connector.send(pal); try { Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } byte[] received = connector.receive(36); if (received == null) { Toast.makeText(getApplicationContext(), "Błąd inicjalizacji skanera", Toast.LENGTH_SHORT).show(); } } 。有什么帮助吗？