2 * Copyright (C) 2015, 2016 "IoT.bzh"
3 * Author "Romain Forlot" <romain.forlot@iot.bzh>
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
22 #define MS_PER_SECOND 1000
24 long long int system_time_ms()
27 long long int timestamp_msec;
31 timestamp_msec = (t_msec.time) * 1000ll +
34 return timestamp_msec;
37 frequency_clock_t::frequency_clock_t()
38 : frequency_{10.0}, last_tick_{0}, time_function_{nullptr}
42 frequency_clock_t::frequency_clock_t(float frequency)
43 : frequency_{frequency}, last_tick_{0}, time_function_{nullptr}
46 /// @brief Return the period in ms given the frequency in hertz.
47 float frequency_clock_t::frequency_to_period(float frequency)
49 return 1 / frequency * MS_PER_SECOND;
52 bool frequency_clock_t::started()
54 return last_tick_ != 0;
57 time_function_t frequency_clock_t::get_time_function()
59 return time_function_ != nullptr ? time_function_ : system_time_ms;
62 bool frequency_clock_t::elapsed(bool stagger)
64 float period = frequency_to_period(frequency_);
65 float elapsed_time = 0;
66 if(!started() && stagger)
67 last_tick_ = get_time_function()() - (rand() % int(period));
69 // Make sure it ticks the the first call to conditionalTick(...)
70 elapsed_time = !started() ? period : get_time_function()() - last_tick_;
72 return frequency_ == 0 || elapsed_time >= period;
75 /// @brief Force the clock to tick, regardless of it its time has actually
77 void frequency_clock_t::tick()
79 last_tick_ = get_time_function()();