driver-epaperdriverhat

E-Paper Driver HAT display driver for Android Things

This driver supports E-Paper screen peripherals connected with an E-Paper Driver HAT.

Supported displays

Part Number	Class	Size	Color	Resolution	Interface
GDEW075T8	Gdew075t8Epd	7.5"	Black, White	640x384	SPI

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.

This driver is based on the GxEPD driver from ZinggJM

How to use the driver

Gradle dependency

To use the epaperdriverhat 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 {
    implementation 'com.leinardi.android.things:driver-epaperdriverhat:<version>'
}

Sample usage

public class EpdScreenActivity extends Activity {
    private static final String TAG = EpdScreenActivity.class.getSimpleName();
    Gdew075t8Epd mEpd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        try {
            mEpd = new Gdew075t8Epd();
            // Show checkerboard
            for (int i = 0; i < mEpd.getDisplayWidth(); i++) {
                for (int j = 0; j < mEpd.getDisplayHeight(); j++) {
                    mEpd.setPixel(i, j, (i % 2) == (j % 2));
                }
            }
            mEpd.show();
        } catch (IOException e) {
            Log.e(TAG, "Error initializing EPD", e);
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        try {
            mEpd.close();
        } catch (IOException e) {
            Log.e(TAG, "Exception closing EPD", e);
        } finally {
            mEpd = null;
        }
    }
}

License

Copyright 2018 Roberto Leinardi

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.