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1 /*
2  * Copyright (C) 2010 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <inttypes.h>
18 #include <android/sensor.h>
19 #include <sensor/Sensor.h>
20 #include <sensor/SensorManager.h>
21 #include <sensor/SensorEventQueue.h>
22 #include <utils/Looper.h>
23 
24 using namespace android;
25 
26 static nsecs_t sStartTime = 0;
27 
28 
receiver(__unused int fd,__unused int events,void * data)29 int receiver(__unused int fd, __unused int events, void* data)
30 {
31     sp<SensorEventQueue> q((SensorEventQueue*)data);
32     ssize_t n;
33     ASensorEvent buffer[8];
34 
35     static nsecs_t oldTimeStamp = 0;
36 
37     while ((n = q->read(buffer, 8)) > 0) {
38         for (int i=0 ; i<n ; i++) {
39             float t;
40             if (oldTimeStamp) {
41                 t = float(buffer[i].timestamp - oldTimeStamp) / s2ns(1);
42             } else {
43                 t = float(buffer[i].timestamp - sStartTime) / s2ns(1);
44             }
45             oldTimeStamp = buffer[i].timestamp;
46 
47             if (buffer[i].type == Sensor::TYPE_ACCELEROMETER) {
48                 printf("%" PRId64 "\t%8f\t%8f\t%8f\t%f\n",
49                         buffer[i].timestamp,
50                         buffer[i].data[0], buffer[i].data[1], buffer[i].data[2],
51                         1.0/t);
52             }
53 
54         }
55     }
56     if (n<0 && n != -EAGAIN) {
57         printf("error reading events (%s)\n", strerror(-n));
58     }
59     return 1;
60 }
61 
62 
main()63 int main()
64 {
65     SensorManager& mgr = SensorManager::getInstanceForPackage(String16("Sensor Service Test"));
66 
67     Sensor const* const* list;
68     ssize_t count = mgr.getSensorList(&list);
69     printf("numSensors=%d\n", int(count));
70 
71     sp<SensorEventQueue> q = mgr.createEventQueue();
72     printf("queue=%p\n", q.get());
73 
74     Sensor const* accelerometer = mgr.getDefaultSensor(Sensor::TYPE_ACCELEROMETER);
75     printf("accelerometer=%p (%s)\n",
76             accelerometer, accelerometer->getName().string());
77 
78     sStartTime = systemTime();
79 
80     q->enableSensor(accelerometer);
81 
82     q->setEventRate(accelerometer, ms2ns(10));
83 
84     sp<Looper> loop = new Looper(false);
85     loop->addFd(q->getFd(), 0, ALOOPER_EVENT_INPUT, receiver, q.get());
86 
87     do {
88         //printf("about to poll...\n");
89         int32_t ret = loop->pollOnce(-1);
90         switch (ret) {
91             case ALOOPER_POLL_WAKE:
92                 //("ALOOPER_POLL_WAKE\n");
93                 break;
94             case ALOOPER_POLL_CALLBACK:
95                 //("ALOOPER_POLL_CALLBACK\n");
96                 break;
97             case ALOOPER_POLL_TIMEOUT:
98                 printf("ALOOPER_POLL_TIMEOUT\n");
99                 break;
100             case ALOOPER_POLL_ERROR:
101                 printf("ALOOPER_POLL_TIMEOUT\n");
102                 break;
103             default:
104                 printf("ugh? poll returned %d\n", ret);
105                 break;
106         }
107     } while (1);
108 
109 
110     return 0;
111 }
112