Android Things & Adafruit Ultimate GPS Breakout v3

Question

我开始玩 Adafruit Ultimate GPS Breakout v3 Android Things v1.0.1 on Raspberry Pi 3. 我在这里使用代码：Github Contrib Drivers 尝试并获取 GPS 坐标，但我运气不好，所以我希望有人能给我指出正确的方向。

GpsModuleCallBack() 未在日志中显示任何内容。

这是我的代码：

MainActivity.java

public class MainActivity extends Activity {

private static final String UART_DEVICE_NAME = "UART0";

UartDevice mDevice;
NmeaGpsModule mGpsModule;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setTitle("GPS Test");

    PeripheralManager gpiolist = PeripheralManager.getInstance();
    List<String> portList = gpiolist.getGpioList();
    if (portList.isEmpty()) {
        Log.w(TAG, "No GPIO port available on this device.");
    } else {
        Log.i(TAG, "List of available ports: " + portList);
    }

    PeripheralManager uartlist = PeripheralManager.getInstance();
    List<String> deviceList = uartlist.getUartDeviceList();
    if (deviceList.isEmpty()) {
        Log.w(TAG, "No UART port available on this device.");
    } else {
        Log.i(TAG, "List of available devices: " + deviceList);
    }


    // Attempt to access the UART device
    try {
        PeripheralManager gpsmanager = PeripheralManager.getInstance();
        mDevice = gpsmanager.openUartDevice(UART_DEVICE_NAME);
        Log.i(TAG, "Accessed " + UART_DEVICE_NAME );
    } catch (IOException e) {
        Log.w(TAG, "Unable to access UART device", e);
    }

    try {
        mGpsModule = new NmeaGpsModule(
               "UART0", 9600, 1.8f);

        mGpsModule.setGpsModuleCallback(new GpsModuleCallback() {
            @Override
            public void onGpsSatelliteStatus(GnssStatus status) {
                Log.i(TAG, "Status: " + status.getSatelliteCount());
            }

            @Override
            public void onGpsTimeUpdate(long timestamp) {
                Log.i(TAG, "Time: " + timestamp);
            }

            @Override
            public void onGpsLocationUpdate(Location location) {
                Log.i(TAG, "Location: " + location.getLatitude() + location.getLongitude());
            }

            @Override
            public void onNmeaMessage(String nmeaMessage) {
                Log.i(TAG, "NMEA Message: " + nmeaMessage);
            }
        });

    } catch (IOException e) {
        // couldn't configure the gps module...
    }

    // Close the GPS module when finished:

    try {
        mGpsModule.close();
    } catch (IOException e) {
        // error closing gps module
    }

}

@Override
protected void onDestroy() {
    super.onDestroy();

    if (mDevice != null) {
        try {
            mDevice.close();
            mDevice = null;
        } catch (IOException e) {
            Log.w(TAG, "Unable to close UART device", e); }
    }
}

Answer 1

Android Things 驱动程序为您打开外设端口，因此您不应直接从 PeripheralManager 访问 UART 并使用该驱动程序。删除以下代码块：

try {
    PeripheralManager gpsmanager = PeripheralManager.getInstance();
    mDevice = gpsmanager.openUartDevice(UART_DEVICE_NAME);
    Log.i(TAG, "Accessed " + UART_DEVICE_NAME );
} catch (IOException e) {
    Log.w(TAG, "Unable to access UART device", e);
}

最有可能的是，您的示例中的下一个代码块抛出异常，因为它无法打开 UART（无法打开两次）但空的 catch 块正在吞噬它：

try {
    mGpsModule = new NmeaGpsModule(
           "UART0", 9600, 1.8f);
    ...

} catch (IOException e) {
    // couldn't configure the gps module...
}

您可能还应该在此处添加一个 Log 语句，以确保没有例外。

Android Things & Adafruit Ultimate GPS Breakout v3

Android Things & Adafruit Ultimate GPS Breakout v3

java

android

raspberry-pi

adafruit

android-things