commit 2f3bf13887257abc9943b7e5bf58e9cd8189eb0a
author Peng Xu <pengxu@google.com> Wed Mar 16 18:05:35 2016 -0700
committer Peng Xu <pengxu@google.com> Mon Mar 28 13:54:48 2016 -0700
tree 3700f62802951a1c4e9d9173e47b38606f4dbae1
parent 8e48e0aadae765b4ed104890ca33db32ea347a8a

Define typical sensor sample rate in native code

Porting typical sensor sample rate (e.g. SENSOR_DELAY_UI)
defined in Java API to native code.

Change-Id: I8b59216415bc952b4e953ca6e8058beb1dd3c645

include/gui/SensorEventQueue.h

diff --git a/include/gui/SensorEventQueue.h b/include/gui/SensorEventQueue.h
index e5b9fc5..4ee7c02 100644
--- a/include/gui/SensorEventQueue.h
+++ b/include/gui/SensorEventQueue.h
@@ -53,6 +53,18 @@
 
     enum { MAX_RECEIVE_BUFFER_EVENT_COUNT = 256 };
 
+    /**
+     * Typical sensor delay (sample period) in microseconds.
+     */
+    // Fastest sampling, system will bound it to minDelay
+    static constexpr int32_t SENSOR_DELAY_FASTEST = 0;
+    // Typical sample period for game, 50Hz;
+    static constexpr int32_t SENSOR_DELAY_GAME = 20000;
+    // Typical sample period for UI, 15Hz
+    static constexpr int32_t SENSOR_DELAY_UI = 66667;
+    // Default sensor sample period
+    static constexpr int32_t SENSOR_DELAY_NORMAL = 200000;
+
     SensorEventQueue(const sp<ISensorEventConnection>& connection);
     virtual ~SensorEventQueue();
     virtual void onFirstRef();
@@ -68,6 +80,7 @@
     status_t wake() const;
 
     status_t enableSensor(Sensor const* sensor) const;
+    status_t enableSensor(Sensor const* sensor, int32_t samplingPeriodUs) const;
     status_t disableSensor(Sensor const* sensor) const;
     status_t setEventRate(Sensor const* sensor, nsecs_t ns) const;
 

libs/gui/SensorEventQueue.cpp

diff --git a/libs/gui/SensorEventQueue.cpp b/libs/gui/SensorEventQueue.cpp
index 5983a6c..6d69839 100644
--- a/libs/gui/SensorEventQueue.cpp
+++ b/libs/gui/SensorEventQueue.cpp
@@ -125,11 +125,16 @@
 }
 
 status_t SensorEventQueue::enableSensor(Sensor const* sensor) const {
-    return mSensorEventConnection->enableDisable(sensor->getHandle(), true, us2ns(200000), 0, false);
+    return enableSensor(sensor, SENSOR_DELAY_NORMAL);
+}
+
+status_t SensorEventQueue::enableSensor(Sensor const* sensor, int32_t samplingPeriodUs) const {
+    return mSensorEventConnection->enableDisable(sensor->getHandle(), true,
+                                                 us2ns(samplingPeriodUs), 0, 0);
 }
 
 status_t SensorEventQueue::disableSensor(Sensor const* sensor) const {
-    return mSensorEventConnection->enableDisable(sensor->getHandle(), false, 0, 0, false);
+    return mSensorEventConnection->enableDisable(sensor->getHandle(), false, 0, 0, 0);
 }
 
 status_t SensorEventQueue::enableSensor(int32_t handle, int32_t samplingPeriodUs,