62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
/*
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* Copyright (C) 2020 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 <libprotocan/MessageCounter.h>
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#include <android-base/logging.h>
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namespace android::hardware::automotive::protocan {
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/** Whether to log counter state messages. */
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static constexpr bool kSuperVerbose = false;
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MessageCounter::MessageCounter(Signal signal) : upperBound(signal.maxValue + 1), mSignal(signal) {}
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Signal::value MessageCounter::next() const {
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CHECK(mCurrent.has_value()) << "Counter not initialized. Did you call isReady?";
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return (*mCurrent + 1) % upperBound;
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}
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void MessageCounter::read(const can::V1_0::CanMessage& msg) {
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auto val = mSignal.get(msg);
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if (!mCurrent.has_value()) {
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LOG(VERBOSE) << "Got first counter val of " << val;
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mCurrent = val;
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return;
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}
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auto nextVal = next();
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if (nextVal == val) {
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if constexpr (kSuperVerbose) {
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LOG(VERBOSE) << "Got next counter val of " << nextVal;
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}
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mCurrent = nextVal;
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} else {
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LOG(DEBUG) << "Ignoring next counter val of " << val << ", waiting for " << nextVal;
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}
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}
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bool MessageCounter::isReady() const { return mCurrent.has_value(); }
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void MessageCounter::increment(can::V1_0::CanMessage& msg) {
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auto newVal = next();
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mCurrent = newVal;
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mSignal.set(msg, newVal);
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}
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} // namespace android::hardware::automotive::protocan
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