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-rw-r--r--low-can-binding/utils/timer.cpp102
1 files changed, 102 insertions, 0 deletions
diff --git a/low-can-binding/utils/timer.cpp b/low-can-binding/utils/timer.cpp
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+++ b/low-can-binding/utils/timer.cpp
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+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <time.h>
+#include <stdlib.h>
+
+#include "timer.hpp"
+
+long long int system_time_us()
+{
+ struct timespec t_usec;
+ long long int timestamp_usec;
+
+ if(!::clock_gettime(CLOCK_MONOTONIC, &t_usec))
+ timestamp_usec = (t_usec.tv_nsec / 1000ll) + (t_usec.tv_sec* 1000000ll);
+ return timestamp_usec;
+}
+
+long long int system_time_ms()
+{
+ struct timespec t_msec;
+ long long int timestamp_msec;
+
+ if(!::clock_gettime(CLOCK_MONOTONIC, &t_msec))
+ timestamp_msec = (t_msec.tv_nsec / 1000000ll) + (t_msec.tv_sec* 1000ll);
+ return timestamp_msec;
+}
+
+long long int system_time_s()
+{
+ struct timespec t_sec;
+ long long int timestamp_sec;
+
+ if(!::clock_gettime(CLOCK_MONOTONIC, &t_sec))
+ timestamp_sec = t_sec.tv_sec;
+ return timestamp_sec;
+}
+
+frequency_clock_t::frequency_clock_t()
+ : unit_{1000000}, frequency_{10.0}, last_tick_{0}, time_function_{nullptr}
+{}
+
+
+frequency_clock_t::frequency_clock_t(float frequency)
+ : unit_{1000000}, frequency_{frequency}, last_tick_{0}, time_function_{nullptr}
+{}
+
+/// @brief Return the period in ms given the frequency in hertz.
+/// @param[in] frequency - Frequency to convert, in hertz
+float frequency_clock_t::frequency_to_period()
+{
+ return 1 / frequency_ * unit_;
+}
+
+bool frequency_clock_t::started()
+{
+ return last_tick_ != 0;
+}
+
+time_function_t frequency_clock_t::get_time_function()
+{
+ return time_function_ != nullptr ? time_function_ : system_time_us;
+}
+
+bool frequency_clock_t::elapsed(bool stagger)
+{
+ float period = frequency_to_period();
+ float elapsed_time = 0;
+ if(!started() && stagger)
+ last_tick_ = get_time_function()() - (rand() % int(period));
+
+ // Make sure it ticks the the first call
+ elapsed_time = !started() ? period : get_time_function()() - last_tick_;
+
+ return frequency_ == 0 || elapsed_time >= period;
+}
+
+float frequency_clock_t::get_frequency() const
+{
+ return frequency_;
+}
+
+/// @brief Force the clock to tick, regardless of it its time has actually
+/// elapsed.
+void frequency_clock_t::tick()
+{
+ last_tick_ = get_time_function()();
+} \ No newline at end of file