从USB(多产)到Android设备的数据传输

我发现发布了一个读取FTDI设备的USB数据的问题.
Transferring data USB
我把这个代码用于多产设备,并且可以检测到usb,除了conn.bulkTransfer()给出-1.

private class UsbRunnable implements Runnable {
    private final UsbDevice mDevice;

    UsbRunnable(UsbDevice dev) {
        mDevice = dev;
    }


    public void run() {//here the main USB functionality is implemented
        UsbDeviceConnection conn = mUsbManager.openDevice(mDevice);
        if (!conn.claimInterface(mDevice.getInterface(1), true)) {
            l("in run(), no connection");
            return;
        }
        l("in run(), connection");



         conn.controlTransfer(0x40, 0, 0, 0, null, 0, 0);// reset
         // mConnection.controlTransfer(0×40,
         // 0, 1, 0, null, 0,
         // 0);//clear Rx
         conn.controlTransfer(0x40, 0, 2, 0, null, 0, 0);// clear Tx
         conn.controlTransfer(0x40, 0x02, 0x0000, 0, null, 0, 0);// flow
                 // control
                 // none
         conn.controlTransfer(0x40, 0x03,  0xC04E, 0, null, 0, 0);// baudrate
                 // 38400
         conn.controlTransfer(0x40, 0x04, 0x0008, 0, null, 0, 0);// data bit
                 // 8, parity
                 // none,
                 // stop bit
                 // 1, tx off   




        UsbEndpoint epIN = null;
        UsbEndpoint epOUT = null;

        byte counter=0;
    //conn.bulkTransfer(epOUT, new byte[]{msData}, 1, 0);

        UsbInterface usbIf = mDevice.getInterface(0);
        for (int i = 0; i < usbIf.getEndpointCount(); i++) {
            l("EP: "
                    + String.format("0x%02X", usbIf.getEndpoint(i)
                            .getAddress()));
            l("Type:"+usbIf.getEndpoint(i).getType());
            if (usbIf.getEndpoint(i).getType() == UsbConstants.USB_ENDPOINT_XFER_INT) {
                l("Bulk Endpoint");
                l("direction: "+usbIf.getEndpoint(i).getDirection());
                if (usbIf.getEndpoint(i).getDirection() == UsbConstants.USB_DIR_IN)
                    epIN = usbIf.getEndpoint(i);

            }
            else l("no bulk");
            l("epIN: "+epIN.toString());
        }

        for (;;) {// this is the main loop for transferring
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            // This is where it is meant to receive
            byte[] buffer = new byte[38400];

            StringBuilder str = new StringBuilder();

            l("bulk transfer thing: " + conn.bulkTransfer(epIN, buffer, 38400, 1000));

            if (conn.bulkTransfer(epIN, buffer, 38400, 1000) > 0 ) {
                l("bulk transfer is success");
                for (int i = 2; i < 64; i++) {
                    if (buffer[i] != 0) {
                        str.append((char) buffer[i]);
                    } else {
                        l(str);
                        break;
                    }
                }

            }
            // this shows the complete string
            l(str);


            if (mStop) {
                mConnectionHandler.onUsbStopped();
                return;
            }
             l("sent " + counter);
                counter++;
                counter = (byte) (counter % 16);
        }

    }
}

// END MAIN LOOP
private BroadcastReceiver mPermissionReceiver = new PermissionReceiver(
        new IPermissionListener() {

            public void onPermissionDenied(UsbDevice d) {
                l("Permission denied on " + d.getDeviceId());
            }
        });

private static interface IPermissionListener {
    void onPermissionDenied(UsbDevice d);
}

public final static String TAG = "USBController";

private void l(Object msg) {
    Log.d(TAG, ">==< " + msg.toString() + " >==<");
}

private void e(Object msg) {
    Log.e(TAG, ">==< " + msg.toString() + " >==<");
}

任何人都可以告诉我需要做哪些改变?先谢谢你.

有几个问题.

我认为已注释的行是您遇到问题的地方.您可能需要重新格式化代码缩进并提供更多信息.无论如何,假设您的问题发生在这里:

byte counter=0;
//conn.bulkTransfer(epOUT, new byte[]{msData}, 1, 0);

我看到的即时问题 – epOut,发送数据的端点为空.所以当然会失败.你没有发送数据.我遵循您发布到您复制的示例代码的链接,它们有一行显示:

epOUT = usbIf.getEndpoint(i);

至少我强烈建议您首先确保您了解原始代码或在开始更改之前在自己的程序中工作.不要只是复制上面的代码行来“修复”你的问题.

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