sample-nativepio: add PWM sample

Change-Id: I85c197be667e266845646d3822d07109030715b2

settings.gradle

@@ -1,2 +1 @@
-include ':blink', ':button'
-
+include ':blink', ':button', ':speaker'

speaker/build.gradle

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2017, The Android Open Source Project
+ *
+ * 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.
+ */
+
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion = 24
+    buildToolsVersion '24.0.3'
+
+    defaultConfig {
+        applicationId = 'com.example.androidthings.nativepio'
+        minSdkVersion   24
+        targetSdkVersion  24
+        versionCode 1
+        versionName "1.0"
+        ndk {
+            abiFilters 'armeabi-v7a', 'x86'
+        }
+        externalNativeBuild {
+            cmake {
+                arguments "-DLIBANDROIDTHINGS_DIR=${rootProject.projectDir}/libandroidthings"
+            }
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'),
+                    'proguard-rules.pro'
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            path 'src/main/cpp/CMakeLists.txt'
+        }
+    }
+}

speaker/src/main/AndroidManifest.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+ Copyright 2017 The Android Open Source Project
+
+ 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.
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.androidthings.nativepio">
+
+  <application android:allowBackup="true" android:icon="@android:drawable/sym_def_app_icon"
+      android:label="@string/app_name">
+    <uses-library android:name="com.google.android.things"/>
+    <activity android:name="android.app.NativeActivity">
+      <meta-data android:name="android.app.lib_name" android:value="speaker" />
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+
+      <!-- Launch activity automatically on boot -->
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN"/>
+        <category android:name="android.intent.category.IOT_LAUNCHER"/>
+        <category android:name="android.intent.category.DEFAULT"/>
+      </intent-filter>
+    </activity>
+  </application>
+
+</manifest>

speaker/src/main/cpp/AndroidSystemProperties.cpp

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.
+ *
+ */
+
+#include "AndroidSystemProperties.h"
+
+#include <jni.h>
+#include <android/native_activity.h>
+
+AndroidSystemProperties::AndroidSystemProperties(ANativeActivity* activity) {
+    JNIEnv *jni;
+    activity->vm->AttachCurrentThread(&jni, NULL);
+    jclass buildClass = jni->FindClass("android/os/Build");
+    jfieldID buildDeviceFieldID = jni->GetStaticFieldID(buildClass, "DEVICE",
+                                                        "Ljava/lang/String;");
+    jstring buildDeviceField = (jstring) jni->GetStaticObjectField(buildClass,
+                                                                   buildDeviceFieldID);
+    const char *buildDevice = jni->GetStringUTFChars(buildDeviceField, NULL);
+    buildDevice_ = buildDevice;
+    jni->ReleaseStringUTFChars(buildDeviceField, buildDevice);
+    activity->vm->DetachCurrentThread();
+}

speaker/src/main/cpp/AndroidSystemProperties.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.
+ *
+ */
+#ifndef ANDROID_SYSTEM_PROPERTIES_H
+#define ANDROID_SYSTEM_PROPERTIES_H
+
+#include <string>
+
+struct ANativeActivity;
+
+class AndroidSystemProperties {
+public:
+    AndroidSystemProperties(ANativeActivity* activity);
+    const std::string& getBuildDevice() {
+        return buildDevice_;
+    }
+private:
+    std::string buildDevice_;
+};
+
+
+#endif //ANDROID_SYSTEM_PROPERTIES_H

speaker/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,46 @@
+#
+# Copyright (C) 2017 The Android Open Source Project
+#
+# 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.
+#
+
+cmake_minimum_required(VERSION 3.4.1)
+
+add_library(speaker SHARED
+            speaker.cpp)
+
+target_include_directories(speaker PRIVATE
+                           ${ANDROID_NDK}/sources/android/native_app_glue
+                           ${LIBANDROIDTHINGS_DIR}/${ANDROID_ABI}/include)
+
+add_library(android-system-properties STATIC
+            AndroidSystemProperties.cpp)
+target_include_directories(android-system-properties PRIVATE
+                           ${ANDROID_NDK}/sources/android/native_app_glue
+                           ${LIBANDROIDTHINGS_DIR}/${ANDROID_ABI}/include)
+
+add_library(native-app-glue STATIC
+            ${ANDROID_NDK}/sources/android/native_app_glue/android_native_app_glue.c)
+
+add_library(androidthings SHARED
+            IMPORTED)
+set_target_properties(androidthings
+                      PROPERTIES IMPORTED_LOCATION
+                      ${LIBANDROIDTHINGS_DIR}/${ANDROID_ABI}/lib/libandroidthings.so)
+
+target_link_libraries(speaker
+                      android
+                      log
+                      native-app-glue
+                      androidthings
+                      android-system-properties)

speaker/src/main/cpp/speaker.cpp

@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.
+ *
+ */
+
+#include <cmath>
+
+#include <android/log.h>
+#include <android/looper.h>
+#include <android_native_app_glue.h>
+
+#include <pio/gpio.h>
+#include <pio/peripheral_manager_client.h>
+
+#include "AndroidSystemProperties.h"
+
+const char* TAG = "speaker";
+const double NOTE_A4_FREQUENCY = 440.0;
+const double FREQUENCY_INC_PER_MS = 0.1;
+
+#define LOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, TAG, __VA_ARGS__)
+#define LOGW(...) __android_log_print(ANDROID_LOG_WARN, TAG, __VA_ARGS__)
+#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, TAG, __VA_ARGS__)
+#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, TAG, __VA_ARGS__)
+#define ASSERT(cond, ...) if (!(cond)) { __android_log_assert(#cond, TAG, __VA_ARGS__);}
+
+int64_t millis() {
+    timespec now;
+    clock_gettime(CLOCK_MONOTONIC, &now);
+    return now.tv_sec*1000 + llround(now.tv_nsec / 1e6);
+}
+
+void android_main(android_app* app) {
+    app_dummy(); // prevent native-app-glue to be stripped.
+
+    AndroidSystemProperties systemProperties(app->activity);
+    const char* SPEAKER_PWM;
+    if (systemProperties.getBuildDevice() == "rpi3") {
+        SPEAKER_PWM = "PWM1";
+    } else if (systemProperties.getBuildDevice() == "edison") {
+        SPEAKER_PWM = "IO3";
+    } else {
+        LOGE("unsupported device: %s", systemProperties.getBuildDevice().c_str());
+        return;
+    }
+
+    APeripheralManagerClient* client = APeripheralManagerClient_new();
+    ASSERT(client, "failed to open peripheral manager client");
+    APwm* pwm;
+    APeripheralManagerClient_openPwm(client, SPEAKER_PWM, &pwm);
+    ASSERT(pwm, "failed to open PWM: %s", SPEAKER_PWM);
+    int setDutyCycleResult = APwm_setDutyCycle(pwm, 50.0);
+    ASSERT(setDutyCycleResult == 0, "failed to set PWM duty cycle: %s", SPEAKER_PWM);
+    int enablePwmResult = APwm_setEnabled(pwm, 1);
+    ASSERT(enablePwmResult == 0, "failed to enable PWM: %s", SPEAKER_PWM);
+
+    double frequency = NOTE_A4_FREQUENCY;
+    int64_t lastMs = millis();
+    while (!app->destroyRequested) {
+        android_poll_source* source;
+        int pollResult = ALooper_pollOnce(0, NULL, NULL, (void**)&source);
+        if (pollResult >= 0) {
+            if (source != NULL) {
+                // forward event to native-app-glue to handle lifecycle and input event
+                // and update `app` state.
+                source->process(app, source);
+            }
+        }
+        if (APwm_setFrequencyHz(pwm, frequency) != 0) {
+            continue; // retry
+        }
+        int64_t now = millis();
+        int64_t elapsedMs = now - lastMs;
+        frequency += FREQUENCY_INC_PER_MS * elapsedMs;
+        if (frequency > NOTE_A4_FREQUENCY * 2) {
+            frequency = NOTE_A4_FREQUENCY;
+        }
+        lastMs = now;
+    }
+    APwm_setEnabled(pwm, 0);
+    APwm_delete(pwm);
+    APeripheralManagerClient_delete(client);
+}

speaker/src/main/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Speaker</string>
+</resources>