Separation Generator to a dedicated repo

Change-Id: Id94831651c3266861435272a6e36c7884bef2c45
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 129 insertions, 0 deletions

diff --git a/low-can-binding/utils/timer.cpp b/low-can-binding/utils/timer.cpp
new file mode 100644
index 0000000..f3cdd5e
--- /dev/null
+++ b/low-can-binding/utils/timer.cpp
@@ -0,0 +1,129 @@
+/*
+ * 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 <cmath>
+
+#include "timer.hpp"
+
+long long int system_time_us()
+{
+	struct timespec t_usec;
+	long long int timestamp_usec = 0;
+	
+	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 = 0;
+	
+	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 = 0;
+	
+	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}
+{
+	if(frequency_ <= 0)
+		frequency_ = 1;
+}
+
+frequency_clock_t::frequency_clock_t(float frequency, uint64_t last_tick, time_function_t time_function)
+	: unit_{1000000}, frequency_{frequency}, last_tick_{0}, time_function_{nullptr}
+{
+	if(frequency_ <= 0)
+		frequency_ = 1;
+}
+
+/// @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() const
+{
+	return frequency_ == 0 ? 0 : 1 / frequency_;
+}
+
+/// @brief Return a timeval struct based on the frequency_ member. used to 
+/// specified CAN BCM timers.
+const struct timeval frequency_clock_t::get_timeval_from_period() const
+{
+	struct timeval freq = {0, 0};
+	float f;
+	freq.tv_usec = (long int)(std::modf(frequency_to_period(), &f) * unit_);
+	freq.tv_sec = (time_t)f;
+
+	return freq;
+}
+
+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 : (float)get_time_function()() - (float)last_tick_;
+
+	return frequency_ == 0 || elapsed_time >= period;
+}
+
+float frequency_clock_t::get_frequency() const
+{
+	return frequency_;
+}
+
+uint64_t frequency_clock_t::get_last_tick() const
+{
+	return last_tick_;
+}
+
+/// @brief Force the clock to tick, regardless of it its time has actually
+/// elapsed.
+void frequency_clock_t::tick(uint64_t timestamp)
+{
+	last_tick_ = timestamp;
+}
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