Arduino 安卓 USB 连接

我正在使用 Arduino杜米拉诺夫 and Nexus 7。我已成功检测到 Arduino 板并显示供应商 ID 和产品 ID。我正在尝试将数据从平板电脑传输到 Arduino 板并尝试闪烁LED在黑板上。 Android 的代码如下。

主要活动.java

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
        UsbDeviceConnection connection;
        HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
        Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
        UsbDevice device = null;
        while(deviceIterator.hasNext()){
            device = deviceIterator.next();
            String s = device.getDeviceName();
            int pid = device.getProductId();
            int did = device.getDeviceId();
            int vid = device.getVendorId();
            TextView tv = (TextView) findViewById(R.id.textview);
            tv.setText(s+"\n"+Integer.toString(pid)+"\n"+Integer.toString(did));
        }
        connection = manager.openDevice(device);
        DataTransfer dt = new DataTransfer(device,connection);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

数据传输.java

public class DataTransfer extends Thread {
    UsbDevice device;
    UsbDeviceConnection connection;
    byte data = 1;
    public DataTransfer(UsbDevice device, UsbDeviceConnection connection) {
        // TODO: Auto-generated constructor stub
        device = this.device;
        connection = this.connection;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        super.run();
        UsbInterface usbIf = device.getInterface(0);
        UsbEndpoint end1 = usbIf.getEndpoint(0);

        //UsbRequest ureq = connection.requestWait();
        final Object[] sSendLock = new Object[]{};
        boolean mStop = false;
        byte mData = 0x00;

        if(!connection.claimInterface(usbIf, true))
        {
            return;
        }

        connection.controlTransfer(0x21, 34, 0, 0, null, 0, 0);
        connection.controlTransfer(0x21, 32, 0, 0, new byte[] { (byte) 0x80,
                0x25, 0x00, 0x00, 0x00, 0x00, 0x08 }, 7, 0);
        connection.controlTransfer(0x40, 0x03, 0x4138, 0, null, 0, 0); //Baudrate 9600

        UsbEndpoint epIN = null;
        UsbEndpoint epOUT = null;

        for (int i = 0; i < usbIf.getEndpointCount(); i++) {
            if (usbIf.getEndpoint(i).getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) {
                if (usbIf.getEndpoint(i).getDirection() == UsbConstants.USB_DIR_IN)
                    epIN = usbIf.getEndpoint(i);
                else
                    epOUT = usbIf.getEndpoint(i);
            }
        }

        for (;;) { // This is the main loop for transferring
            synchronized (sSendLock) { //OK, there should be a OUT queue, no guarantee that the byte is sent actually.
                try {
                    sSendLock.wait();
                }
                catch (InterruptedException e) {
                    if (mStop) {
                        return;
                    }
                    e.printStackTrace();
                }
                connection.bulkTransfer(epOUT,new byte[] {data}, 1, 0);
            }
        }
    }
}

我的 Arduino 代码是：

int incomingByte = 0; // For incoming serial data
void setup() {
    pinMode(13, OUTPUT);
    Serial.begin(9600); // Opens serial port, sets data rate to 9600 bps.
}

void loop() {
    // Send data only when you receive data:
    if (Serial.available() > 0) {
        // Read the incoming byte:
        incomingByte = Serial.read();
        digitalWrite(13, HIGH);   // Set the LED on
        delay(1000);              // Wait for a second
        digitalWrite(13, LOW);    // Set the LED off

        // Say what you got:
        Serial.print("I received: ");
        Serial.println(incomingByte, DEC);
    }
}

问题是 Arduino 板上没有 LED 发光。我不确定问题出在哪里，因为我刚刚开始在这个领域工作。

您引用的项目http://android.serverbox.ch/?p=549注释中的内容仅适用于更新的 Arduino 板，例如 Uno（或使用它们实现的 CDC-ACM 串行 USB 方案的其他板）。

较旧的 Arduino 板（例如 duemilanove）使用 FTDI USB 串行芯片，这需要不同的 USB 操作。

您也许可以在某个地方找到有关将 FT232 系列 USB 串行转换器与 Android 的 USB 主机 api 接口的信息（FTDI 部件广泛用于嵌入式系统中，因此您可能会找到一些东西），或者您可以获得 Uno 板来尝试您已有的代码。