3301542828
also use correct time propagation equation disable the fused sensors when gyro is not present since they were unusable in practice. Change-Id: Iad797425784e67dc6c5690e97c71c583418cc5b5
95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdint.h>
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#include <math.h>
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#include <sys/types.h>
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#include <utils/Errors.h>
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#include <hardware/sensors.h>
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#include "GravitySensor.h"
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#include "SensorDevice.h"
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#include "SensorFusion.h"
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namespace android {
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// ---------------------------------------------------------------------------
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GravitySensor::GravitySensor(sensor_t const* list, size_t count)
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: mSensorDevice(SensorDevice::getInstance()),
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mSensorFusion(SensorFusion::getInstance())
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{
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for (size_t i=0 ; i<count ; i++) {
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if (list[i].type == SENSOR_TYPE_ACCELEROMETER) {
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mAccelerometer = Sensor(list + i);
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break;
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}
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}
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}
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bool GravitySensor::process(sensors_event_t* outEvent,
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const sensors_event_t& event)
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{
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const static double NS2S = 1.0 / 1000000000.0;
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if (event.type == SENSOR_TYPE_ACCELEROMETER) {
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vec3_t g;
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if (!mSensorFusion.hasEstimate())
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return false;
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const mat33_t R(mSensorFusion.getRotationMatrix());
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// FIXME: we need to estimate the length of gravity because
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// the accelerometer may have a small scaling error. This
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// translates to an offset in the linear-acceleration sensor.
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g = R[2] * GRAVITY_EARTH;
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*outEvent = event;
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outEvent->data[0] = g.x;
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outEvent->data[1] = g.y;
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outEvent->data[2] = g.z;
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outEvent->sensor = '_grv';
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outEvent->type = SENSOR_TYPE_GRAVITY;
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return true;
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}
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return false;
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}
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status_t GravitySensor::activate(void* ident, bool enabled) {
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return mSensorFusion.activate(this, enabled);
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}
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status_t GravitySensor::setDelay(void* ident, int handle, int64_t ns) {
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return mSensorFusion.setDelay(this, ns);
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}
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Sensor GravitySensor::getSensor() const {
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sensor_t hwSensor;
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hwSensor.name = "Gravity Sensor";
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hwSensor.vendor = "Google Inc.";
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hwSensor.version = 3;
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hwSensor.handle = '_grv';
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hwSensor.type = SENSOR_TYPE_GRAVITY;
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hwSensor.maxRange = GRAVITY_EARTH * 2;
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hwSensor.resolution = mAccelerometer.getResolution();
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hwSensor.power = mSensorFusion.getPowerUsage();
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hwSensor.minDelay = mSensorFusion.getMinDelay();
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Sensor sensor(&hwSensor);
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return sensor;
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}
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// ---------------------------------------------------------------------------
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}; // namespace android
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