TI DLP NIRScan Nano:通过USB连接到Android智能手机

时间:2018-04-10 07:57:51

标签: android usb hid

我已经实现了一个Android应用程序,它通过蓝牙LE与DLP NIRscan Nano通信。它工作正常,但不幸的是,传输扫描结果需要很长时间 - 特别是如果你想连续进行几次单独的扫描。

这就是为什么我目前正试图通过USB OTG线将设备连接到Android智能手机。我可以通过USB成功连接到设备,但目前还不清楚如何读取或写入数据。

到目前为止我所理解的是:

当我想阅读时,例如蒂瓦版本信息,我认为它将像下面提到的代码一样工作。 设备规格:http://www.ti.com/lit/ug/dlpu030g/dlpu030g.pdf,请参阅第83页

为什么不起作用?我从未得到传感器的任何响应。

我必须使用controlTransfer吗?数据包错了吗?是否可以通过USB将扫描仪连接到Android智能手机?

任何帮助表示赞赏: - )

由于 本

UsbConfiguration usbConfiguration = usbDevice.getConfiguration(0);
UsbInterface usbInterface = usbConfiguration.getInterface(0);
inEndpoint = usbInterface.getEndpoint(0);
outEndpoint = usbInterface.getEndpoint(1);
connection = usbManager.openDevice(usbDevice);
connection.claimInterface(usbInterface, true);

byte[] data = new UsbPacket()
        .setGroupByte((byte) 0x02)
        .setCommandByte((byte) 0x16)
        .setFlagRW(UsbPacket.RW.READ)
        .setFlagReady(UsbPacket.READY.READY)
        .toByteArray();

UsbRequest request = new UsbRequest();
request.initialize(connection, outEndpoint);
request.queue(ByteBuffer.wrap(data), data.length);
connection.requestWait();

UsbRequest request1 = new UsbRequest();
request1.initialize(connection, inEndpoint);
byte[] result = new byte[28];
request1.queue(ByteBuffer.wrap(result), result.length);
connection.requestWait(); // Actual: never terminates!
// Expected: result byte array contains Tiva version information



class UsbPacket {
    private byte flags;
    private int sequence = 0;
    private byte commandByte;
    private byte groupByte;
    private byte[] data;

    enum RW {
        WRITE,
        READ
    }

    enum READY {
        BUSY,
        READY
    }

    enum ERROR {
        SUCCESS,
        ERROR,
        BUSY
    }

    UsbPacket setFlagRW(RW flag) {
        if (flag == RW.READ) {
            this.flags = (byte) (this.flags | 0x80);
        }
        return this;
    }

    UsbPacket setFlagReady(READY flag) {
        if (flag == READY.READY) {
            this.flags = (byte) (this.flags | 0x40);
        }
        return this;
    }

    UsbPacket setFlagError(ERROR flag) {
        if (flag == ERROR.ERROR) {
            this.flags = (byte) (this.flags | 0x20);
        }
        if (flag == ERROR.BUSY) {
            this.flags = (byte) (this.flags | 0x10);
        }
        return this;
    }

    UsbPacket setSequence(int sequence) {
        if (0 > sequence || sequence > 255) {
            throw new IllegalArgumentException("Only values from 0 to 255 are allowed");
        }
        this.sequence = sequence;
        return this;
    }

    UsbPacket setCommandByte(byte commandByte) {
        this.commandByte = commandByte;
        return this;
    }

    UsbPacket setGroupByte(byte groupByte) {
        this.groupByte = groupByte;
        return this;
    }

    public UsbPacket setData(byte[] data) {
        this.data = data;
        return this;
    }

    byte[] toByteArray() {
        byte[] dataLength;
        int lengthOfCommandBytes = 2;
        if (data != null) {
            dataLength = ConvertUtility.convertTo2ByteArray(lengthOfCommandBytes + data.length);
        }
        else {
            dataLength = ConvertUtility.convertTo2ByteArray(lengthOfCommandBytes);
        }
        byte[] header = new byte[] {
                0x00,
                flags,
                (byte) sequence,
                dataLength[0],
                dataLength[1],
                commandByte,
                groupByte
        };

        byte[] packet;
        if (data != null) {
            packet = new byte[7 + data.length];
            System.arraycopy(header, 0, packet, 0, header.length);
            System.arraycopy(data, 0, packet, 7, data.length);
        }
        else {
            packet = header;
        }
        return packet;
    }
}

0 个答案:

没有答案