1 // Copyright 2021 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 #pragma once 15 16 #include <zephyr/kernel.h> 17 18 // Use the Zephyr config's tick rate. 19 #define PW_CHRONO_SYSTEM_CLOCK_PERIOD_SECONDS_NUMERATOR 1 20 #define PW_CHRONO_SYSTEM_CLOCK_PERIOD_SECONDS_DENOMINATOR \ 21 CONFIG_SYS_CLOCK_TICKS_PER_SEC 22 23 #ifdef __cplusplus 24 25 #include "pw_chrono/epoch.h" 26 27 namespace pw::chrono::backend { 28 29 // The Zephyr clock starts at zero during initialization, approximately the 30 // time since boot. 31 inline constexpr Epoch kSystemClockEpoch = pw::chrono::Epoch::kTimeSinceBoot; 32 33 // The current backend implementation is not NMI safe. 34 inline constexpr bool kSystemClockNmiSafe = false; 35 36 // The Zephyr clock never halts. 37 inline constexpr bool kSystemClockFreeRunning = false; 38 39 } // namespace pw::chrono::backend 40 41 #endif // __cplusplus 42