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 // Configuration macros for the tokenizer module. 15 #pragma once 16 17 #include <assert.h> 18 19 // For the embOS backend of the SystemClock, there is no way to determine the 20 // system timer's tick interval/frequency. By default most ports happen to be at 21 // 1ms intervals (i.e. 1kHz), however this can be tuned for different 22 // applications. 23 // The resulting clock period is defined in seconds = 1 / denominator. 24 // For example the default is configured to 1/1000 seconds per clock tick. 25 #ifndef PW_CHRONO_EMBOS_CFG_CLOCK_PERIOD_SECONDS_DENOMINATOR 26 #define PW_CHRONO_EMBOS_CFG_CLOCK_PERIOD_SECONDS_DENOMINATOR 1000 27 #endif // PW_CHRONO_EMBOS_CFG_CLOCK_PERIOD_SECONDS_DENOMINATOR 28 29 static_assert(PW_CHRONO_EMBOS_CFG_CLOCK_PERIOD_SECONDS_DENOMINATOR >= 1, 30 "the denominator must be positive and cannot be fractional"); 31 32 // Because the SystemClock::now() implementation requires the user to invoke it 33 // more than once per overflow period, the max timeout is set to ensure that 34 // blocking indefinitely on a single primitive will meet this constraint with 35 // margin (i.e. more than twice per overflow). 36 #ifndef PW_CHRONO_EMBOS_CFG_MAX_TIMEOUT 37 #define PW_CHRONO_EMBOS_CFG_MAX_TIMEOUT (0x7FFFFFFF / 3) 38 #endif // PW_CHRONO_EMBOS_CFG_MAX_TIMEOUT 39 40 static_assert((PW_CHRONO_EMBOS_CFG_MAX_TIMEOUT > 0) && 41 (PW_CHRONO_EMBOS_CFG_MAX_TIMEOUT <= 0x7FFFFFFF), 42 "Invalid MAX timeout configuration"); 43