| /* |
| * Copyright (C) 2013 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. |
| */ |
| |
| package android.hardware.cts.helpers.sensorTestOperations; |
| |
| import android.content.Context; |
| import android.hardware.cts.helpers.SensorCtsHelper; |
| import android.hardware.cts.helpers.SensorManagerTestVerifier; |
| import android.hardware.cts.helpers.SensorTestInformation; |
| import android.hardware.cts.helpers.SensorTestOperation; |
| import android.hardware.cts.helpers.SensorVerificationHelper; |
| import android.hardware.cts.helpers.SensorVerificationHelper.VerificationResult; |
| import android.hardware.cts.helpers.TestSensorEvent; |
| |
| import junit.framework.Assert; |
| |
| import java.security.InvalidParameterException; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Test Operation class that validates the sampling rate jittering of a given sensor. |
| * |
| * Remarks: |
| * - In order to guarantee proper results in any environment, the maximum sampling rate supported by |
| * the Sensor is used, this guarantees the frequency reference for the test. |
| */ |
| public class VerifyJitteringOperation extends SensorTestOperation { |
| protected SensorManagerTestVerifier mSensor; |
| protected long mExpectedtimestampInNs; |
| protected long mThresholdPercentage; |
| protected long mThresholdInNs; |
| |
| public VerifyJitteringOperation( |
| Context context, |
| int sensorType, |
| int reportLatencyInUs, |
| int thresholdPercentageOfNs) throws InvalidParameterException { |
| if(thresholdPercentageOfNs < 0) { |
| throw new InvalidParameterException("thresholdPercentageOfNs needs to be >= 0"); |
| } |
| // use the max sampling frequency the sensor reports to guarantee the results |
| int maxSamplingRateInUs = SensorTestInformation.getMaxSamplingRateInUs(context, sensorType); |
| mSensor = new SensorManagerTestVerifier( |
| context, |
| sensorType, |
| maxSamplingRateInUs, |
| reportLatencyInUs); |
| // set expectations |
| mExpectedtimestampInNs = TimeUnit.NANOSECONDS.convert( |
| maxSamplingRateInUs, |
| TimeUnit.MICROSECONDS); |
| mThresholdPercentage = thresholdPercentageOfNs; |
| mThresholdInNs = mExpectedtimestampInNs / mThresholdPercentage; |
| } |
| |
| @Override |
| public void doWork() { |
| TestSensorEvent[] events = mSensor.collectEvents(100); |
| VerificationResult result = SensorVerificationHelper.verifyJitter(events, mThresholdInNs); |
| if (result.isFailed()) { |
| Assert.fail(SensorCtsHelper.formatAssertionMessage( |
| "Jitter(95%ile)", |
| this, |
| mSensor.getUnderlyingSensor(), |
| result.getFailureMessage())); |
| } |
| } |
| } |