cf5df9cf40
This change implements direct report for accel, gyro and mag at normal and fast rate level. It supports ashmem shared memory. The direct report and traditional sensor subscription are still tangled up in this implementation. Bug: 30985702 Bug: 33588372 Test: tested via demo app Change-Id: Idc4f626dfe624558718c1b04f16898a0ea247e62
134 lines
3.0 KiB
C++
134 lines
3.0 KiB
C++
/*
|
|
* Copyright (C) 2015 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.
|
|
*/
|
|
|
|
//#define LOG_DEBUG 1
|
|
#define LOG_TAG "ring"
|
|
#include <utils/Log.h>
|
|
|
|
#include "ring.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
namespace android {
|
|
|
|
RingBuffer::RingBuffer(size_t size)
|
|
: mSize(size),
|
|
mData((sensors_event_t *)malloc(sizeof(sensors_event_t) * mSize)),
|
|
mReadPos(0),
|
|
mWritePos(0) {
|
|
}
|
|
|
|
RingBuffer::~RingBuffer() {
|
|
free(mData);
|
|
mData = NULL;
|
|
}
|
|
|
|
ssize_t RingBuffer::write(const sensors_event_t *ev, size_t size) {
|
|
Mutex::Autolock autoLock(mLock);
|
|
|
|
size_t numAvailableToRead = mWritePos - mReadPos;
|
|
size_t numAvailableToWrite = mSize - numAvailableToRead;
|
|
|
|
if (size > numAvailableToWrite) {
|
|
size = numAvailableToWrite;
|
|
}
|
|
|
|
size_t writePos = (mWritePos % mSize);
|
|
size_t copy = mSize - writePos;
|
|
|
|
if (copy > size) {
|
|
copy = size;
|
|
}
|
|
|
|
memcpy(&mData[writePos], ev, copy * sizeof(sensors_event_t));
|
|
|
|
if (size > copy) {
|
|
memcpy(mData, &ev[copy], (size - copy) * sizeof(sensors_event_t));
|
|
}
|
|
|
|
mWritePos += size;
|
|
|
|
if (numAvailableToRead == 0 && size > 0) {
|
|
mNotEmptyCondition.broadcast();
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
ssize_t RingBuffer::read(sensors_event_t *ev, size_t size) {
|
|
Mutex::Autolock autoLock(mLock);
|
|
|
|
size_t numAvailableToRead;
|
|
for (;;) {
|
|
numAvailableToRead = mWritePos - mReadPos;
|
|
if (numAvailableToRead > 0) {
|
|
break;
|
|
}
|
|
|
|
mNotEmptyCondition.wait(mLock);
|
|
}
|
|
|
|
if (size > numAvailableToRead) {
|
|
size = numAvailableToRead;
|
|
}
|
|
|
|
size_t readPos = (mReadPos % mSize);
|
|
size_t copy = mSize - readPos;
|
|
|
|
if (copy > size) {
|
|
copy = size;
|
|
}
|
|
|
|
memcpy(ev, &mData[readPos], copy * sizeof(sensors_event_t));
|
|
|
|
if (size > copy) {
|
|
memcpy(&ev[copy], mData, (size - copy) * sizeof(sensors_event_t));
|
|
}
|
|
|
|
mReadPos += size;
|
|
|
|
return size;
|
|
}
|
|
|
|
LockfreeBuffer::LockfreeBuffer(void* buf, size_t size)
|
|
: mData((sensors_event_t *)buf), mSize(size/sizeof(sensors_event_t)),
|
|
mWritePos(0), mCounter(1) {
|
|
memset(mData, 0, size);
|
|
}
|
|
|
|
LockfreeBuffer::~LockfreeBuffer() {
|
|
memset(mData, 0, mSize*sizeof(sensors_event_t));
|
|
}
|
|
|
|
void LockfreeBuffer::write(const sensors_event_t *ev, size_t size) {
|
|
if (!mSize) {
|
|
return;
|
|
}
|
|
|
|
while(size--) {
|
|
mData[mWritePos] = *(ev++);
|
|
mData[mWritePos].reserved0 = mCounter++;
|
|
|
|
if (++mWritePos >= mSize) {
|
|
mWritePos = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace android
|
|
|