Databases
StackOverflow2013
Postsdbo
POaccess (faster polling) accelerometer via NativeActivity NDK
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POaccess (faster polling) accelerometer via NativeActivity NDK
    primarykey
    data
    text
    <p>I've searched for a tutorial/an answer on polling accelerometer faster with NDK but didnt find solver yet. just found an androiddevelopers documentation <a href="http://developer.android.com/reference/android/app/NativeActivity.html" rel="noreferrer">here</a>.</p> <p>what i need is polling acceleration about 100 samples per second (100Hz), by default my device (Samsung Galaxy SL i9003 with gingerbread 2.3.5) with default SENSOR_DELAY_FASTEST can only get about 60 samples persecond (60Hz). Therefore i tried to access sensor via NativeActivity with NDK by generating .c files that i try to make based on sensor.h and looper.h:</p> <pre><code>#include &lt;jni.h&gt; #include &lt;string.h&gt; #include &lt;android/sensor.h&gt; #include &lt;android/log.h&gt; #include &lt;android/looper.h&gt; #define TAG "accelerondk" #define LOGI(...) __android_log_print(ANDROID_LOG_INFO, TAG, __VA_ARGS__) #define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__) #define LOOPER_ID 1 #define SAMP_PER_SEC 100 //i've changed to 120, even 10, but nothing happen void Java_azka_web_ndk_AcceleroNDKActivity_startMonitoring(JNIEnv* env, jclass clazz) { ASensorManager* sensorManager = ASensorManager_getInstance(); ALooper* looper = ALooper_forThread(); if(looper == NULL) looper = ALooper_prepare(ALOOPER_PREPARE_ALLOW_NON_CALLBACKS); ASensorRef accelerometerSensor = ASensorManager_getDefaultSensor(sensorManager,ASENSOR_TYPE_ACCELEROMETER); LOGI("accelerometerSensor: %s, vendor: %s", ASensor_getName(accelerometerSensor), ASensor_getVendor(accelerometerSensor)); ASensorEventQueue* queue = ASensorManager_createEventQueue(sensorManager, looper, LOOPER_ID, NULL, NULL); ASensorEventQueue_enableSensor(queue, accelerometerSensor); ASensorEventQueue_setEventRate(queue, accelerometerSensor, (1000L/SAMP_PER_SEC)*1000); int ident;//identifier int events; while (1) { while ((ident=ALooper_pollAll(-1, NULL, &amp;events, NULL) &gt;= 0)) { // If a sensor has data, process it now. if (ident == LOOPER_ID) { ASensorEvent event; while (ASensorEventQueue_getEvents(queue, &amp;event, 1) &gt; 0) { LOGI("aaaaaaa accelerometer X = %f y = %f z=%f ", event.acceleration.x, event.acceleration.y, event.acceleration.z); } } } } } </code></pre> <p>so far, i've been able to access accelerometer with NativeActivity, but there is no change with number sample had taken. even when i change ASensorEventQueue_setEventRate big enough or small enough the acceleration recorded still about 60 samples per second (1 samples per 15 milisec)</p> <p>is there any mistakes in my code? or something that i forget with?</p> <p>thanks in advance</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USAzkario Rizky
    1. USAzkario Rizky
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POaccess (faster polling) accelerometer via NativeActivity NDK
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POaccess (faster polling) accelerometer via NativeActivity NDK
      1. USÁsbjörn Hagalín Pétursson
      1. VTFavorite
    3. VO
      singulars
      1. POaccess (faster polling) accelerometer via NativeActivity NDK
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload