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E-Paper Driver HAT
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| /build |
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| # Change Log | ||
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| ## [0.1] - 2018-01-19 | ||
| - initial version | ||
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| # E-Paper Driver HAT display driver for Android Things | ||
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| [](https://jcenter.bintray.com/com/leinardi/android/things/driver-epaperdriverhat/maven-metadata.xml) | ||
| [](https://travis-ci.org/leinardi/androidthings-drivers) | ||
| [](https://github.com/leinardi/androidthings-drivers/blob/master/LICENSE) | ||
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| This driver supports E-Paper screen peripherals connected with an E-Paper Driver HAT. | ||
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| ## Supported displays | ||
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| <!-- DISPLAY_LIST_START --> | ||
| Part Number | Class | Size | Color | Resolution | Interface | ||
| :---:|:---:| --- | --- | --- | --- | ||
| [GDEW075T8](https://www.waveshare.com/wiki/7.5inch_e-Paper_HAT) | `Gdew075t8Epd` | 7.5" | Black, White | 640x384 | SPI | ||
| <!-- DISPLAY_LIST_END --> | ||
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| 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. | ||
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| This driver is based on the [GxEPD driver from ZinggJM](https://github.com/ZinggJM/GxEPD) | ||
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| ## How to use the driver | ||
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| ### Gradle dependency | ||
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| 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][jcenter]. | ||
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| ``` | ||
| dependencies { | ||
| implementation 'com.leinardi.android.things:driver-epaperdriverhat:<version>' | ||
| } | ||
| ``` | ||
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| ### Sample usage | ||
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| ```java | ||
| public class EpdScreenActivity extends Activity { | ||
| private static final String TAG = EpdScreenActivity.class.getSimpleName(); | ||
| Gdew075t8Epd mEpd; | ||
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| @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); | ||
| } | ||
| } | ||
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| @Override | ||
| public void onDestroy() { | ||
| super.onDestroy(); | ||
| try { | ||
| mEpd.close(); | ||
| } catch (IOException e) { | ||
| Log.e(TAG, "Exception closing EPD", e); | ||
| } finally { | ||
| mEpd = null; | ||
| } | ||
| } | ||
| } | ||
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| ``` | ||
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| ## License | ||
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| Copyright 2018 Roberto Leinardi | ||
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| 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 | ||
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| http://www.apache.org/licenses/LICENSE-2.0 | ||
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| 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. | ||
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| [jcenter]: https://bintray.com/leinardi/androidthings/driver-epaperdriverhat/_latestVersion |
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| /* | ||
| * Copyright 2018 Roberto Leinardi. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
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| apply plugin: 'com.android.library' | ||
| apply from: rootProject.file('checkstyle.gradle') | ||
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| android { | ||
| compileSdkVersion build_versions.target_sdk | ||
| buildToolsVersion build_versions.build_tools | ||
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| apply from: 'mavenConfig.gradle' | ||
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| defaultConfig { | ||
| minSdkVersion build_versions.min_sdk | ||
| targetSdkVersion build_versions.target_sdk | ||
| versionCode build_versions.version_code | ||
| versionName mvn_config.version as String | ||
| testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" | ||
| } | ||
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| compileOptions { | ||
| sourceCompatibility build_versions.java_version | ||
| targetCompatibility build_versions.java_version | ||
| } | ||
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| buildTypes { | ||
| release { | ||
| minifyEnabled false | ||
| proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' | ||
| } | ||
| } | ||
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| } | ||
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| dependencies { | ||
| compileOnly deps.androidthings | ||
| implementation deps.support.annotations | ||
| } |
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| /* | ||
| * Copyright 2018 Roberto Leinardi. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
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| def mvn_config = [:] | ||
| mvn_config.repository = 'androidthings' | ||
| mvn_config.group_id = 'com.leinardi.android.things' | ||
| mvn_config.artifact_id = 'driver-epaperdriverhat' | ||
| mvn_config.version = '0.1' | ||
| mvn_config.licenses = 'Apache-2.0' // Comma separated | ||
| mvn_config.website = 'https://github.com/leinardi/androidthings-drivers' | ||
| mvn_config.issue_tracker_url = 'https://github.com/leinardi/androidthings-drivers/issues' | ||
| mvn_config.vcs_url = 'https://github.com/leinardi/androidthings-drivers.git' | ||
| mvn_config.description = 'E-Paper Driver HAT driver for Android Things' | ||
| mvn_config.tags = 'epaperdriverhat,gdew075t8,android-things,android,raspberry-pi' // Comma separated | ||
| mvn_config.githubRepo = 'leinardi/androidthings-drivers' | ||
| mvn_config.inception_year = '2018' | ||
| mvn_config.dryRun = false | ||
| mvn_config.publish = false | ||
| mvn_config.override = true | ||
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| ext.mvn_config = mvn_config | ||
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| apply from: rootProject.file('maven.gradle') | ||
| apply from: rootProject.file('bintray.gradle') |
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| # Add project specific ProGuard rules here. | ||
| # You can control the set of applied configuration files using the | ||
| # proguardFiles setting in build.gradle. | ||
| # | ||
| # For more details, see | ||
| # http://developer.android.com/guide/developing/tools/proguard.html | ||
|
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| # If your project uses WebView with JS, uncomment the following | ||
| # and specify the fully qualified class name to the JavaScript interface | ||
| # class: | ||
| #-keepclassmembers class fqcn.of.javascript.interface.for.webview { | ||
| # public *; | ||
| #} | ||
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| # Uncomment this to preserve the line number information for | ||
| # debugging stack traces. | ||
| #-keepattributes SourceFile,LineNumberTable | ||
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| # If you keep the line number information, uncomment this to | ||
| # hide the original source file name. | ||
| #-renamesourcefileattribute SourceFile |
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| <!-- | ||
| ~ Copyright 2018 Roberto Leinardi. | ||
| ~ | ||
| ~ Licensed 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. | ||
| --> | ||
|
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| <manifest package="com.leinardi.android.things.driver.epd" | ||
| xmlns:android="http://schemas.android.com/apk/res/android"> | ||
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| <application> | ||
| <uses-library | ||
| android:name="com.google.android.things" | ||
| android:required="false" /> | ||
| </application> | ||
| </manifest> |
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...verhat/src/main/java/com/leinardi/android/things/driver/epaperdriverhat/BitmapHelper.java
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| /* | ||
| * Copyright 2018 Roberto Leinardi. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
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| package com.leinardi.android.things.driver.epaperdriverhat; | ||
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| import android.graphics.Bitmap; | ||
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| public class BitmapHelper { | ||
| private static final int GRADIENT_CUTOFF = 85; // Tune for gradient picker on grayscale images. | ||
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| private BitmapHelper() { | ||
| } | ||
|
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| /** | ||
| * Converts a bitmap image to LCD screen data and sets it on the given screen at the specified | ||
| * offset. | ||
| * | ||
| * @param mScreen The e-paper screen to write the bitmap data to. | ||
| * @param xOffset The horizontal offset to draw the image at. | ||
| * @param yOffset The vertical offset to draw the image at. | ||
| * @param bmp The bitmap image that you want to convert to screen data. | ||
| * @param drawWhite true for drawing only white pixels, false for drawing grayscale pixel | ||
| * based on {@link #GRADIENT_CUTOFF}. | ||
| */ | ||
| public static void setBmpData(Epd mScreen, int xOffset, int yOffset, Bitmap bmp, boolean drawWhite) { | ||
| int width = bmp.getWidth(); | ||
| int height = bmp.getHeight(); | ||
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| for (int y = 0; y < height; y++) { | ||
| for (int x = 0; x < width; x++) { | ||
| int pixel = bmp.getPixel(x, y); | ||
| if (!drawWhite) { // Look at Alpha channel instead | ||
| if ((pixel & 0xFF) <= GRADIENT_CUTOFF) { | ||
| mScreen.setPixel(x + xOffset, y + yOffset, true); | ||
| } else { | ||
| mScreen.setPixel(x + xOffset, y + yOffset, false); | ||
| } | ||
| } else { | ||
| if (pixel == -1) { // Only draw white pixels | ||
| mScreen.setPixel(x + xOffset, y + yOffset, true); | ||
| } else { | ||
| mScreen.setPixel(x + xOffset, y + yOffset, false); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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