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/*
* Copyright (C) 2010 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.
*/
#include <android/sensor.h>
#include <gui/Sensor.h>
#include <gui/SensorManager.h>
#include <gui/SensorEventQueue.h>
#include <utils/Looper.h>
using namespace android;
static nsecs_t sStartTime = 0;
int receiver(int fd, int events, void* data)
{
sp<SensorEventQueue> q((SensorEventQueue*)data);
ssize_t n;
ASensorEvent buffer[8];
static nsecs_t oldTimeStamp = 0;
while ((n = q->read(buffer, 8)) > 0) {
for (int i=0 ; i<n ; i++) {
float t;
if (oldTimeStamp) {
t = float(buffer[i].timestamp - oldTimeStamp) / s2ns(1);
} else {
t = float(buffer[i].timestamp - sStartTime) / s2ns(1);
}
oldTimeStamp = buffer[i].timestamp;
if (buffer[i].type == Sensor::TYPE_ACCELEROMETER) {
printf("%lld\t%8f\t%8f\t%8f\t%f\n",
buffer[i].timestamp,
buffer[i].data[0], buffer[i].data[1], buffer[i].data[2],
1.0/t);
}
}
}
if (n<0 && n != -EAGAIN) {
printf("error reading events (%s)\n", strerror(-n));
}
return 1;
}
int main(int argc, char** argv)
{
SensorManager& mgr(SensorManager::getInstance());
Sensor const* const* list;
ssize_t count = mgr.getSensorList(&list);
printf("numSensors=%d\n", int(count));
sp<SensorEventQueue> q = mgr.createEventQueue();
printf("queue=%p\n", q.get());
Sensor const* accelerometer = mgr.getDefaultSensor(Sensor::TYPE_ACCELEROMETER);
printf("accelerometer=%p (%s)\n",
accelerometer, accelerometer->getName().string());
sStartTime = systemTime();
q->enableSensor(accelerometer);
q->setEventRate(accelerometer, ms2ns(10));
sp<Looper> loop = new Looper(false);
loop->addFd(q->getFd(), 0, ALOOPER_EVENT_INPUT, receiver, q.get());
do {
//printf("about to poll...\n");
int32_t ret = loop->pollOnce(-1);
switch (ret) {
case ALOOPER_POLL_WAKE:
//("ALOOPER_POLL_WAKE\n");
break;
case ALOOPER_POLL_CALLBACK:
//("ALOOPER_POLL_CALLBACK\n");
break;
case ALOOPER_POLL_TIMEOUT:
printf("ALOOPER_POLL_TIMEOUT\n");
break;
case ALOOPER_POLL_ERROR:
printf("ALOOPER_POLL_TIMEOUT\n");
break;
default:
printf("ugh? poll returned %d\n", ret);
break;
}
} while (1);
return 0;
}
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