mma7660fc

MMA7660FC driver for Android Things

This driver supports the NXP MMA7660FC three-axis accelerometer.

NOTE: these drivers are not production-ready. They are offered as sample implementations of Android Things user space drivers for common peripherals as part of the Developer Preview release. There is no guarantee of correctness, completeness or robustness.

How to use the driver

Gradle dependency

To use the mma7660fc driver, simply add the line below to your project's build.gradle, where <version> matches the last version of the driver available on jcenter.

dependencies {
    compile 'com.google.android.things.contrib:driver-mma7660fc:<version>'
}

Sample usage

import com.google.android.things.contrib.driver.mma7660fc.Mma7660fc;

// Access the environmental sensor directly:

mma7660fc mMma7660fc;

try {
    mMma7660fc = new Mma7660fc(i2cBusName);
    mMma7660fc.setMode(Mma7660fc.MODE_ACTIVE);
} catch (IOException e) {
    // couldn't configure the device...
}

// Read accelerometer values:

try {
    float[] sample = mMma7660fc.readSample();
} catch (IOException e) {
    // error reading sample
}

// Close the accelerometer sensor when finished:

try {
    mMma7660fc.close();
} catch (IOException e) {
    // error closing sensor
}

If you need to read sensor values continuously, you can register the Mma7660Fc with the system and listen for sensor values using the Sensor APIs:

SensorManager mSensorManager = getSystemService(Context.SENSOR_SERVICE);
SensorEventListener mListener = ...;
Mma7660FcAccelerometerDriver mSensorDriver;

mSensorManager.registerDynamicSensorCallback(new SensorManager.DynamicSensorCallback() {
    @Override
    public void onDynamicSensorConnected(Sensor sensor) {
        if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            mSensorManager.registerListener(mListener, sensor,
                    SensorManager.SENSOR_DELAY_NORMAL);
        }
    }
});

try {
    mSensorDriver = new Mma7660FcAccelerometerDriver(i2cBusName);
    mSensorDriver.register();
} catch (IOException e) {
    // Error configuring sensor
}

// Unregister and close the driver when finished:

mSensorManager.unregisterListener(mListener);
mSensorDriver.unregister();
try {
    mSensorDriver.close();
} catch (IOException e) {
    // error closing sensor
}

License

Copyright 2016 Google Inc.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.