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 "pw_chrono_embos/config.h" 17 18 // embOS does not have an API to determine the tick rate/period at compile time, 19 // instead require the user to specify this through the configuration. Note it 20 // is configured by the user as Hz, ergo the numerator is always 1. 21 #define PW_CHRONO_SYSTEM_CLOCK_PERIOD_SECONDS_NUMERATOR 1 22 #define PW_CHRONO_SYSTEM_CLOCK_PERIOD_SECONDS_DENOMINATOR \ 23 PW_CHRONO_EMBOS_CFG_CLOCK_PERIOD_SECONDS_DENOMINATOR 24 25 #ifdef __cplusplus 26 27 #include "pw_chrono/epoch.h" 28 29 namespace pw::chrono::backend { 30 31 // The embOS clock starts at zero during initialization, approximately the 32 // time since boot. 33 inline constexpr Epoch kSystemClockEpoch = pw::chrono::Epoch::kTimeSinceBoot; 34 35 // The current backend implementation is not NMI safe. 36 inline constexpr bool kSystemClockNmiSafe = false; 37 38 // The embOS clock halts when the systick interrupt is masked. 39 inline constexpr bool kSystemClockFreeRunning = false; 40 41 } // namespace pw::chrono::backend 42 43 #endif // __cplusplus 44