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modules: chre
Add initial build rules for CHRE. This change includes a Kconfig and CMakeLists.txt to begin compiling code from the CHRE module. Additional files are included to bridge the APIs from CHRE's to Zephyr's. These can be found in modules/chre/include and modules/chre/src. Additionally, add a sample to make sure that the module builds. It can be built via: ``` $ west build -b native_posix -p=always samples/application_development/chre ``` Signed-off-by: Yuval Peress <[email protected]>
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‎modules/Kconfig

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@@ -84,6 +84,9 @@ comment "FFF module not available."
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comment "zcbor module not available."
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depends on !ZEPHYR_ZCBOR_MODULE
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comment "CHRE module not available."
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depends on !ZEPHYR_CHRE_MODULE
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# This ensures that symbols are available in Kconfig for dependency checking
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# and referencing, while keeping the settings themselves unavailable when the
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# modules are not present in the workspace

‎samples/modules/chre/CMakeLists.txt

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# Copyright (c) Google LLC
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# SPDX-License-Identifier: Apache-2.0
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cmake_minimum_required(VERSION 3.20.0)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(chre_sample)
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FILE(GLOB app_sources src/*.cpp)
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target_sources(app PRIVATE ${app_sources})
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target_include_directories(app PRIVATE include)

‎samples/modules/chre/README.rst

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Android's Context Hub Runtime Environment (CHRE)
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################################################
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Android's context hub enables the use of nanoapps. A single nanoapp has 3 entry points seen in
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`chre_api/chre/nanoapp.h`_:
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* A ``nanoappStart`` function used to notify the nanoapp that it is now active.
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* A ``nanoappHandleEvent`` function used to notify the nanoapp tha an event of interest took place.
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* A ``nanoappEnd`` function used to notify the nanoapp that it is now deactivated.
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The CHRE connects to several frameworks called Platform Abstraction Layers (PAL)s. Note that
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currently, none of these are implemented for Zephyr, but they are scheduled to be added. These
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frameworks include:
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#. *Audio* - a framework allowing nanoapps to get audio events. See `pal/audio.h`_ for API details.
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#. *GNSS* - a framework allowing nanoapps to manage location and measurement sessions. See
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`pal/gnss.h`_ for API details.
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#. *Sensor* - a framework allowing nanoapps to request changes to sensors configuration get
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data/bias events. See `pal/sensor.h`_ for API details.
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#. *System* - a framework allowing nanoapps to make common system requests such as logging, clock,
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and some basic memory allocation/deallocation. See `pal/system.h`_ for API details.
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#. *WiFi* - a framework allowing nanoapps to interact with the on board WiFi. See `pal/wifi.h`_ for
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API details.
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#. *WWAN* - a framework allowing nanoapps to interact with the WWAN module such as getting the
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current capabilities and info. See `pal/wwan.h`_ for API details.
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Building and expectations
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=========================
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To build the sample use the following west command:
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.. zephyr-app-commands::
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:zephyr-app: samples/modules/chre
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:board: native_posix
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:goals: build
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Once built and run, the sample application should:
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#. Print a hello message
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#. Notify that the event loop started via an ``inf`` level log
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#. Notify that a nanoapp was started and assigned an instance/app ID of 1 via a ``dbg`` level log
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#. Print a message saying that the nanoapp's start callback was called
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#. Send an event of type ``1`` and no data to the nanoapp
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#. Notify that the event was processed
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#. Call the ``nanoappEnd`` function of the nanoapp
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#. Print a message notifying that it's not possible to remove a system level nanoapp
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#. Exit the event loop
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Roadmap
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=======
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#. Add an implementation of the `pal/sensor.h`_ and `pal/system.h`_ to Zephyr. These will be
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standalone modules that can be used independently of CHRE, but when ``CONFIG_CHRE`` is enabled
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will also provide an implementation of ``chrePalSensorGetApi()`` and ``struct chrePalSystemApi``.
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#. Add a directory ``chre/nanoapps`` which will host various nanoapps to be used by the Zephyr
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community. These should each have their own Kconfig to enable them and set the appropriate
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dependencies. The first nanoapp will be a lid angle calculator which will use 2 accelerometers.
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#. Update the ``overlay.dts`` of this sample application to include 2 emulated accelerometers and
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configure them to return scripted data.
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#. Run this sample application and watch the nanoapp provide lid angle calculations based on 2
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accelerometers provided by the sensors PAL framework.
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.. _`chre_api/chre/nanoapp.h`: https://cs.android.com/android/platform/superproject/+/master:system/chre/chre_api/include/chre_api/chre/nanoapp.h;drc=7c60a553288d63e6e3370d679803da46dac723a4
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.. _`pal/audio.h`: https://cs.android.com/android/platform/superproject/+/master:system/chre/pal/include/chre/pal/audio.h;l=69;drc=6ca547ad175f80ce9f09f5b7b14fcc6f14565f5c
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.. _`pal/gnss.h`: https://cs.android.com/android/platform/superproject/+/master:system/chre/pal/include/chre/pal/gnss.h;l=152;drc=830255234157cc7afe5201dca19a7fb71ea850fe
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.. _`pal/sensor.h`: https://cs.android.com/android/platform/superproject/+/master:system/chre/pal/include/chre/pal/sensor.h;l=51;drc=23207906add05054a94dfab41b95bcfc39bedfe4
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.. _`pal/system.h`: https://cs.android.com/android/platform/superproject/+/master:system/chre/pal/include/chre/pal/system.h;l=49;drc=6ca547ad175f80ce9f09f5b7b14fcc6f14565f5c
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.. _`pal/wifi.h`: https://cs.android.com/android/platform/superproject/+/master:system/chre/pal/include/chre/pal/wifi.h;l=153;drc=b673b80ed98e1b6e6360bee4ba98e2cd8f4e0935
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.. _`pal/wwan.h`: https://cs.android.com/android/platform/superproject/+/master:system/chre/pal/include/chre/pal/wwan.h;l=69;drc=629361a803cb305c8575b41614e6e071e7141a03

‎samples/modules/chre/include/apps.hpp

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/* Copyright (c) 2021 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef SAMPLES_APPLICATION_DEVELOPMENT_CHRE_INCLUDE_APPS_H_
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#define SAMPLES_APPLICATION_DEVELOPMENT_CHRE_INCLUDE_APPS_H_
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#include "chre/core/nanoapp.h"
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#include "chre/util/unique_ptr.h"
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namespace chre {
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UniquePtr<Nanoapp> initializeStaticNanoappEchoApp();
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} /* namespace chre */
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#endif /* SAMPLES_APPLICATION_DEVELOPMENT_CHRE_INCLUDE_APPS_H_ */

‎samples/modules/chre/prj.conf

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CONFIG_CHRE=y
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CONFIG_LOG=y
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CONFIG_CHRE_LOG_LEVEL_DBG=y
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CONFIG_CPLUSPLUS=y
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CONFIG_STD_CPP17=y
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CONFIG_LIB_CPLUSPLUS=y

‎samples/modules/chre/sample.yaml

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sample:
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description: A simple echo app using Android's Context Hub Runtime
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Environment (CHRE).
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name: chre
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tests:
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sample.modules.chre:
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tags: introduction
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harness: console
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harness_config:
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type: multi_line
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ordered: false
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regex:
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- "Hello CHRE!"
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- "\\[.*\\] .*<inf> chre: EventLoop start.*"
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- "\\[.*\\] .*<dbg> chre: startNanoapp: Instance ID 1 assigned to app ID 0x0000000000000001.*"
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- "EchoApp::nanoappStart\\(\\)"
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- "EchoApp::nanoappHandleEvent\\(sender_instance_id=0, event_type=1, event_data@\\(nil\\)\\)"
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- "Event \\(1\\) complete!"
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- "EchoApp::nanoappEnd\\(\\)"
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- "\\[.*\\] .*<inf> chre: Exiting EventLoop.*"
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integration_platforms:
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- native_posix
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filter: not CONFIG_MINIMAL_LIBC

‎samples/modules/chre/src/echoapp.cpp

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/* Copyright (c) 2021 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <cinttypes>
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#include <sys/printk.h>
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#include "chre_api/chre/event.h"
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#include "chre/core/event_loop_manager.h"
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#include "chre/platform/static_nanoapp_init.h"
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#include "chre/util/system/napp_permissions.h"
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namespace
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{
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constexpr const uint64_t kAppId = 1;
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constexpr const uint32_t kAppVersion = 1;
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chre::Nanoapp *nanoapp = nullptr;
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bool nanoappStart(void)
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{
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printk("EchoApp::nanoappStart()\n");
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nanoapp = chre::EventLoopManagerSingleton ::get()->getEventLoop().getCurrentNanoapp();
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nanoapp->registerForBroadcastEvent(CHRE_EVENT_MESSAGE_FROM_HOST);
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return true;
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}
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void nanoappHandleEvent(uint32_t sender_instance_id, uint16_t event_type, const void *event_data)
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{
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printk("EchoApp::nanoappHandleEvent(sender_instance_id=%u, event_type=%u, event_data@%p)\n",
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sender_instance_id, event_type, event_data);
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}
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void nanoappEnd()
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{
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nanoapp->unregisterForBroadcastEvent(0);
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nanoapp = nullptr;
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printk("EchoApp::nanoappEnd()\n");
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}
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} /* anonymous namespace */
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CHRE_STATIC_NANOAPP_INIT(EchoApp, kAppId, kAppVersion, chre::NanoappPermissions::CHRE_PERMS_NONE);

‎samples/modules/chre/src/main.cpp

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/* Copyright (c) 2021 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr.h>
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#include <sys/printk.h>
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#include "apps.hpp"
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#include "chre/core/event_loop_manager.h"
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#include "chre/target_platform/init.h"
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inline const char *boolToString(bool cond)
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{
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return cond ? "SUCCESS" : "FAIL";
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}
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void main(void)
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{
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auto echo_app = chre::initializeStaticNanoappEchoApp();
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auto& eventLoop = chre::EventLoopManagerSingleton::get()->getEventLoop();
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uint32_t instanceId;
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if (chre::zephyr::init()) {
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printk("Failed to initialize!\n");
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return;
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}
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printk("Hello CHRE!\n");
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k_msleep(500);
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printk("Starting EchoApp... %s\n", boolToString(eventLoop.startNanoapp(echo_app)));
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printk("Nanoapp count=%u\n", eventLoop.getNanoappCount());
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printk("Finding instance ID... %s\n", boolToString(eventLoop.findNanoappInstanceIdByAppId(1, &instanceId)));
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printk("Nanoapp count=%u\n", eventLoop.getNanoappCount());
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printk("Instance ID: %u\n", instanceId);
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printk("Sending event %u...\n", eventLoop.getNanoappCount());
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eventLoop.postEventOrDie(CHRE_EVENT_MESSAGE_FROM_HOST, nullptr, [](uint16_t eventType, void *eventData) {
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printk("Event (%u) complete!\n", eventType);
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});
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k_sleep(K_MSEC(500));
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printk("Ending EchoApp... %s\n",
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boolToString(eventLoop.unloadNanoapp(instanceId, false)));
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chre::zephyr::deinit();
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printk("Goodbye!\n");
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}

‎west.yml

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- name: canopennode
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revision: 53d3415c14d60f8f4bfca54bfbc5d5a667d7e724
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path: modules/lib/canopennode
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- name: chre
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revision: 0edfe2c2ec656afb910cfab8ed59a5ffd59b87c8
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path: modules/lib/chre
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- name: civetweb
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revision: 094aeb41bb93e9199d24d665ee43e9e05d6d7b1c
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path: modules/lib/civetweb

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