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.
21 * @brief return epoch in milliseconds
23 * @return long long int epoch in milliseconds
25 typedef long long int (*time_function_t)();
27 long long int system_time_us();
28 long long int system_time_ms();
29 long long int system_time_s();
32 * @class frequency_clock_t
33 * @brief A frequency counting clock.
35 * @var frequency_clock_t::frequency
36 * the clock frequency in Hz.
37 * @var frequency_clock_t::last_time
38 * the last time (in milliseconds since startup) that the clock
40 * @var frequency_clock_t::time_function
41 * a function returning current time
43 class frequency_clock_t
47 unsigned long last_tick_;
48 time_function_t time_function_;
52 frequency_clock_t(float frequency);
53 frequency_clock_t(float frequency, unsigned long last_tick, time_function_t time_function);
55 float get_frequency() const;
56 static float frequency_to_period(float frequency);
58 time_function_t get_time_function();
59 bool elapsed(bool stagger);