88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
/*
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* Copyright (C) 2022 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 <algorithm>
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#include <cinttypes>
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#include "chre/platform/fatal_error.h"
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#include "chre/platform/log.h"
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#include "chre/platform/system_timer.h"
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#include "chre/util/time.h"
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namespace chre {
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void SystemTimerBase::invokeCallback(void *instance) {
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auto *timer = static_cast<SystemTimer *>(instance);
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timer->mCallback(timer->mData);
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}
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SystemTimer::SystemTimer() {}
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SystemTimer::~SystemTimer() {
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// cancel an existing timer if any, and delete the timer instance.
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cancel();
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OS_DeleteTimerEx(&mTimer);
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}
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bool SystemTimer::init() {
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constexpr uint32_t kSomeInitialPeriod = 100;
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OS_CreateTimerEx(&mTimer, SystemTimerBase::invokeCallback, kSomeInitialPeriod,
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this /*context*/);
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return true;
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}
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bool SystemTimer::set(SystemTimerCallback *callback, void *data,
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Nanoseconds delay) {
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// The public EmbOS documentation does not specify how it handles calls to
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// its timer create API if the values lie beyond the specified interval of
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// 1 ≤ Period ≤ 0x7FFFFFFF. Since there's not return value to assess API
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// call success, we clamp the delay to the supported interval.
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// Note that since the EmbOS timer is a millisecond tick timer, an additional
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// delay of 1ms is added to the requested delay to avoid clipping/zeroing
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// during the time factor conversion.
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// TODO(b/237819962): Investigate the possibility of a spare hardware timer
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// available on SLSI that we can eventually switch to.
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constexpr uint64_t kMinDelayMs = 1;
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constexpr uint64_t kMaxDelayMs = INT32_MAX;
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uint64_t delayMs = Milliseconds(delay).getMilliseconds();
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delayMs = std::min(std::max(delayMs + 1, kMinDelayMs), kMaxDelayMs);
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OS_StopTimerEx(&mTimer);
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OS_SetTimerPeriodEx(&mTimer, static_cast<OS_TIME>(delayMs));
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mCallback = callback;
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mData = data;
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OS_RetriggerTimerEx(&mTimer);
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return true;
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}
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// The return value for this function is not guaranteed to be correct - please
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// see the note in @ref SystemTimerBase.
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bool SystemTimer::cancel() {
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bool success = false;
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if (isActive()) {
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OS_StopTimerEx(&mTimer);
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success = true;
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}
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return success;
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}
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bool SystemTimer::isActive() {
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return (OS_GetTimerStatusEx(&mTimer) != 0);
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}
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} // namespace chre
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