Question

我开始在Raspberry Pi 3上使用Adafruit Ultimate GPS Breakout v3和Android Things v1.0.1。我在这里使用代码：Github Contrib Drivers尝试获取GPS坐标，但我我没有运气，所以我希望有人能指出我正确的方向。

GpsModuleCallBack（）不会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驱动程序会为您打开外设端口，因此您不应直接从PeripheralManager使用驱动程序访问UART。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，您示例中的下一个代码块是抛出异常，因为它无法打开UART（它无法打开两次），但空的catch块正在吞下它：

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

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

你应该在那里添加一个Log语句，以确保那里没有例外。

Android Things＆amp; Adafruit Ultimate GPS Breakout v3

1 个答案: