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.
24 long long int system_time_us()
26 struct timespec t_usec;
27 long long int timestamp_usec = 0;
29 if(!::clock_gettime(CLOCK_MONOTONIC, &t_usec))
30 timestamp_usec = (t_usec.tv_nsec / 1000ll) + (t_usec.tv_sec* 1000000ll);
31 return timestamp_usec;
34 long long int system_time_ms()
36 struct timespec t_msec;
37 long long int timestamp_msec = 0;
39 if(!::clock_gettime(CLOCK_MONOTONIC, &t_msec))
40 timestamp_msec = (t_msec.tv_nsec / 1000000ll) + (t_msec.tv_sec* 1000ll);
41 return timestamp_msec;
44 long long int system_time_s()
46 struct timespec t_sec;
47 long long int timestamp_sec = 0;
49 if(!::clock_gettime(CLOCK_MONOTONIC, &t_sec))
50 timestamp_sec = t_sec.tv_sec;
54 frequency_clock_t::frequency_clock_t()
55 : unit_{1000000}, frequency_{10.0}, last_tick_{0}, time_function_{nullptr}
58 frequency_clock_t::frequency_clock_t(float frequency)
59 : unit_{1000000}, frequency_{frequency}, last_tick_{0}, time_function_{nullptr}
65 frequency_clock_t::frequency_clock_t(float frequency, uint64_t last_tick, time_function_t time_function)
66 : unit_{1000000}, frequency_{frequency}, last_tick_{0}, time_function_{nullptr}
71 /// @brief Return the period in ms given the frequency in hertz.
72 /// @param[in] frequency - Frequency to convert, in hertz
73 float frequency_clock_t::frequency_to_period() const
75 return frequency_ == 0 ? 0 : 1 / frequency_;
78 const struct timeval frequency_clock_t::get_timeval_from_period() const
80 struct timeval freq = {0, 0};
82 freq.tv_usec = (long int)(std::modf(frequency_to_period(), &f) * unit_);
83 freq.tv_sec = (time_t)f;
88 bool frequency_clock_t::started()
90 return last_tick_ != 0;
93 time_function_t frequency_clock_t::get_time_function()
95 return time_function_ != nullptr ? time_function_ : system_time_us;
98 bool frequency_clock_t::elapsed(bool stagger)
100 float period = frequency_to_period();
101 float elapsed_time = 0;
102 if(!started() && stagger)
103 last_tick_ = get_time_function()() - (rand() % int(period));
105 // Make sure it ticks the the first call
106 elapsed_time = !started() ? period : (float)get_time_function()() - (float)last_tick_;
108 return frequency_ == 0 || elapsed_time >= period;
111 float frequency_clock_t::get_frequency() const
116 /// @brief Force the clock to tick, regardless of it its time has actually
118 void frequency_clock_t::tick(uint64_t timestamp)
120 last_tick_ = timestamp;