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.
23 long long int system_time_us()
25 struct timespec t_usec;
26 long long int timestamp_usec;
28 if(!::clock_gettime(CLOCK_MONOTONIC, &t_usec))
29 timestamp_usec = (t_usec.tv_nsec / 1000ll) + (t_usec.tv_sec* 1000000ll);
30 return timestamp_usec;
33 long long int system_time_ms()
35 struct timespec t_msec;
36 long long int timestamp_msec;
38 if(!::clock_gettime(CLOCK_MONOTONIC, &t_msec))
39 timestamp_msec = (t_msec.tv_nsec / 1000000ll) + (t_msec.tv_sec* 1000ll);
40 return timestamp_msec;
43 long long int system_time_s()
45 struct timespec t_sec;
46 long long int timestamp_sec;
48 if(!::clock_gettime(CLOCK_MONOTONIC, &t_sec))
49 timestamp_sec = t_sec.tv_sec;
53 frequency_clock_t::frequency_clock_t()
54 : frequency_{10.0}, last_tick_{0}, time_function_{nullptr}
58 frequency_clock_t::frequency_clock_t(float frequency)
59 : frequency_{frequency}, last_tick_{0}, time_function_{nullptr}
62 /// @brief Return the period in ms given the frequency in hertz.
63 float frequency_clock_t::frequency_to_period(float frequency)
68 bool frequency_clock_t::started()
70 return last_tick_ != 0;
73 time_function_t frequency_clock_t::get_time_function()
75 return time_function_ != nullptr ? time_function_ : system_time_ms;
78 bool frequency_clock_t::elapsed(bool stagger)
80 float period = frequency_to_period(frequency_);
81 float elapsed_time = 0;
82 if(!started() && stagger)
83 last_tick_ = get_time_function()() - (rand() % int(period));
85 // Make sure it ticks the the first call
86 elapsed_time = !started() ? period : get_time_function()() - last_tick_;
88 return frequency_ == 0 || elapsed_time >= period;
91 float frequency_clock_t::get_frequency() const
96 /// @brief Force the clock to tick, regardless of it its time has actually
98 void frequency_clock_t::tick()
100 last_tick_ = get_time_function()();