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callback_timer_atomic.h
/******************************************************************************
The MIT License(MIT)
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
Copyright(c) 2021 John Wellbelove
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/
#ifndef ETL_CALLBACK_TIMER_ATOMIC_INCLUDED
#define ETL_CALLBACK_TIMER_ATOMIC_INCLUDED
#include "platform.h"
#include "algorithm.h"
#include "delegate.h"
#include "error_handler.h"
#include "placement_new.h"
#include "static_assert.h"
#include "timer.h"
#include <stdint.h>
namespace etl
{
//***************************************************************************
//***************************************************************************
template <typename TSemaphore>
class icallback_timer_atomic
{
public:
typedef etl::delegate<void(void)> callback_type;
typedef etl::delegate<void(etl::timer::id::type)> event_callback_type;
//*******************************************
//*******************************************
etl::timer::id::type register_timer(callback_type callback_, uint32_t period_, bool repeating_)
{
etl::timer::id::type id = etl::timer::id::NO_TIMER;
bool is_space = (number_of_registered_timers < Max_Timers);
if (is_space)
{
// Search for the free space.
for (uint_least8_t i = 0U; i < Max_Timers; ++i)
{
timer_data& timer = timer_array[i];
if (timer.id == etl::timer::id::NO_TIMER)
{
// Create in-place.
new (&timer) timer_data(i, callback_, period_, repeating_);
++number_of_registered_timers;
id = i;
break;
}
}
}
return id;
}
//*******************************************
//*******************************************
bool unregister_timer(etl::timer::id::type id_)
{
bool result = false;
if (id_ != etl::timer::id::NO_TIMER)
{
timer_data& timer = timer_array[id_];
if (timer.id != etl::timer::id::NO_TIMER)
{
if (timer.is_active())
{
++process_semaphore;
active_list.remove(timer.id, false);
remove_callback.call_if(timer.id);
--process_semaphore;
}
// Reset in-place.
new (&timer) timer_data();
--number_of_registered_timers;
result = true;
}
}
return result;
}
//*******************************************
//*******************************************
void enable(bool state_)
{
enabled = state_;
}
//*******************************************
//*******************************************
bool is_running() const
{
return enabled;
}
//*******************************************
//*******************************************
void clear()
{
++process_semaphore;
active_list.clear();
--process_semaphore;
for (uint8_t i = 0U; i < Max_Timers; ++i)
{
::new (&timer_array[i]) timer_data();
}
number_of_registered_timers = 0;
}
//*******************************************
// Called by the timer service to indicate the
// amount of time that has elapsed since the last successful call to 'tick'.
// Returns true if the tick was processed,
// false if not.
//*******************************************
bool tick(uint32_t count)
{
if (enabled)
{
if (process_semaphore == 0U)
{
// We have something to do?
bool has_active = !active_list.empty();
if (has_active)
{
while (has_active && (count >= active_list.front().delta))
{
timer_data& timer = active_list.front();
count -= timer.delta;
active_list.remove(timer.id, true);
remove_callback.call_if(timer.id);
if (timer.callback.is_valid())
{
// Call the delegate callback.
timer.callback();
}
if (timer.repeating)
{
// Reinsert the timer.
timer.delta = timer.period;
active_list.insert(timer.id);
insert_callback.call_if(timer.id);
}
has_active = !active_list.empty();
}
if (has_active)
{
// Subtract any remainder from the next due timeout.
active_list.front().delta -= count;
}
}
return true;
}
}
return false;
}
//*******************************************
//*******************************************
bool start(etl::timer::id::type id_, bool immediate_ = false)
{
bool result = false;
// Valid timer id?
if (id_ != etl::timer::id::NO_TIMER)
{
timer_data& timer = timer_array[id_];
// Registered timer?
if (timer.id != etl::timer::id::NO_TIMER)
{
// Has a valid period.
if (timer.period != etl::timer::state::Inactive)
{
++process_semaphore;
if (timer.is_active())
{
active_list.remove(timer.id, false);
remove_callback.call_if(timer.id);
}
timer.delta = immediate_ ? 0U : timer.period;
active_list.insert(timer.id);
insert_callback.call_if(timer.id);
--process_semaphore;
result = true;
}
}
}
return result;
}
//*******************************************
//*******************************************
bool stop(etl::timer::id::type id_)
{
bool result = false;
// Valid timer id?
if (id_ != etl::timer::id::NO_TIMER)
{
timer_data& timer = timer_array[id_];
// Registered timer?
if (timer.id != etl::timer::id::NO_TIMER)
{
if (timer.is_active())
{
++process_semaphore;
active_list.remove(timer.id, false);
remove_callback.call_if(timer.id);
--process_semaphore;
}
result = true;
}
}
return result;
}
//*******************************************
//*******************************************
bool set_period(etl::timer::id::type id_, uint32_t period_)
{
if (stop(id_))
{
timer_array[id_].period = period_;
return true;
}
return false;
}
//*******************************************
//*******************************************
bool set_mode(etl::timer::id::type id_, bool repeating_)
{
if (stop(id_))
{
timer_array[id_].repeating = repeating_;
return true;
}
return false;
}
//*******************************************
//*******************************************
bool has_active_timer() const
{
++process_semaphore;
bool result = !active_list.empty();
--process_semaphore;
return result;
}
//*******************************************
//*******************************************
uint32_t time_to_next() const
{
uint32_t delta = static_cast<uint32_t>(etl::timer::interval::No_Active_Interval);
++process_semaphore;
if (!active_list.empty())
{
delta = active_list.front().delta;
}
--process_semaphore;
return delta;
}
//*******************************************
//*******************************************
bool is_active(etl::timer::id::type id_) const
{
bool result = false;
// Valid timer id?
if (is_valid_timer_id(id_))
{
++process_semaphore;
if (has_active_timer())
{
const timer_data& timer = timer_array[id_];
// Registered timer?
if (timer.id != etl::timer::id::NO_TIMER)
{
result = timer.is_active();
}
}
--process_semaphore;
}
return result;
}
//*******************************************
//*******************************************
void set_insert_callback(event_callback_type insert_)
{
insert_callback = insert_;
}
//*******************************************
//*******************************************
void set_remove_callback(event_callback_type remove_)
{
remove_callback = remove_;
}
//*******************************************
void clear_insert_callback()
{
insert_callback.clear();
}
//*******************************************
void clear_remove_callback()
{
remove_callback.clear();
}
protected:
//*************************************************************************
struct timer_data
{
//*******************************************
timer_data()
: callback()
, period(0U)
, delta(etl::timer::state::Inactive)
, id(etl::timer::id::NO_TIMER)
, previous(etl::timer::id::NO_TIMER)
, next(etl::timer::id::NO_TIMER)
, repeating(true)
{
}
//*******************************************
//*******************************************
timer_data(etl::timer::id::type id_, callback_type callback_, uint32_t period_, bool repeating_)
: callback(callback_)
, period(period_)
, delta(etl::timer::state::Inactive)
, id(id_)
, previous(etl::timer::id::NO_TIMER)
, next(etl::timer::id::NO_TIMER)
, repeating(repeating_)
{
}
//*******************************************
//*******************************************
bool is_active() const
{
return delta != etl::timer::state::Inactive;
}
//*******************************************
//*******************************************
void set_inactive()
{
delta = etl::timer::state::Inactive;
}
callback_type callback;
uint32_t period;
uint32_t delta;
etl::timer::id::type id;
uint_least8_t previous;
uint_least8_t next;
bool repeating;
private:
// Disabled.
timer_data(const timer_data& other) ETL_DELETE;
timer_data& operator=(const timer_data& other) ETL_DELETE;
};
//*******************************************
//*******************************************
icallback_timer_atomic(timer_data* const timer_array_, const uint_least8_t Max_Timers_)
: timer_array(timer_array_)
, active_list(timer_array_)
, enabled(false)
, process_semaphore(0U)
, number_of_registered_timers(0U)
, Max_Timers(Max_Timers_)
{
}
private:
//*******************************************
//*******************************************
bool is_valid_timer_id(etl::timer::id::type id_) const
{
return (id_ < Max_Timers);
}
//*************************************************************************
//*************************************************************************
class timer_list
{
public:
//*******************************
timer_list(timer_data* ptimers_)
: head(etl::timer::id::NO_TIMER)
, tail(etl::timer::id::NO_TIMER)
, ptimers(ptimers_)
{
}
//*******************************
bool empty() const
{
return head == etl::timer::id::NO_TIMER;
}
//*******************************
// Inserts the timer at the correct delta position
//*******************************
void insert(etl::timer::id::type id_)
{
timer_data& timer = ptimers[id_];
if (head == etl::timer::id::NO_TIMER)
{
// No entries yet.
head = id_;
tail = id_;
timer.previous = etl::timer::id::NO_TIMER;
timer.next = etl::timer::id::NO_TIMER;
}
else
{
// We already have entries.
etl::timer::id::type test_id = begin();
while (test_id != etl::timer::id::NO_TIMER)
{
timer_data& test = ptimers[test_id];
// Find the correct place to insert.
if (timer.delta <= test.delta)
{
if (test.id == head)
{
head = timer.id;
}
// Insert before test.
timer.previous = test.previous;
test.previous = timer.id;
timer.next = test.id;
// Adjust the next delta to compensate.
test.delta -= timer.delta;
if (timer.previous != etl::timer::id::NO_TIMER)
{
ptimers[timer.previous].next = timer.id;
}
break;
}
else
{
timer.delta -= test.delta;
}
test_id = next(test_id);
}
// Reached the end?
if (test_id == etl::timer::id::NO_TIMER)
{
// Tag on to the tail.
ptimers[tail].next = timer.id;
timer.previous = tail;
timer.next = etl::timer::id::NO_TIMER;
tail = timer.id;
}
}
}
//*******************************
void remove(etl::timer::id::type id_, bool has_expired)
{
timer_data& timer = ptimers[id_];
if (head == id_)
{
head = timer.next;
}
else
{
ptimers[timer.previous].next = timer.next;
}
if (tail == id_)
{
tail = timer.previous;
}
else
{
ptimers[timer.next].previous = timer.previous;
}
if (!has_expired)
{
// Adjust the next delta.
if (timer.next != etl::timer::id::NO_TIMER)
{
ptimers[timer.next].delta += timer.delta;
}
}
timer.previous = etl::timer::id::NO_TIMER;
timer.next = etl::timer::id::NO_TIMER;
timer.delta = etl::timer::state::Inactive;
}
//*******************************
timer_data& front()
{
return ptimers[head];
}
//*******************************
const timer_data& front() const
{
return ptimers[head];
}
//*******************************
etl::timer::id::type begin()
{
return head;
}
//*******************************
etl::timer::id::type next(etl::timer::id::type last)
{
return ptimers[last].next;
}
//*******************************
void clear()
{
etl::timer::id::type id = begin();
while (id != etl::timer::id::NO_TIMER)
{
timer_data& timer = ptimers[id];
id = next(id);
timer.next = etl::timer::id::NO_TIMER;
}
head = etl::timer::id::NO_TIMER;
tail = etl::timer::id::NO_TIMER;
}
private:
etl::timer::id::type head;
etl::timer::id::type tail;
timer_data* const ptimers;
};
// The array of timer data structures.
timer_data* const timer_array;
// The list of active timers.
timer_list active_list;
bool enabled;
mutable TSemaphore process_semaphore;
uint_least8_t number_of_registered_timers;
event_callback_type insert_callback;
event_callback_type remove_callback;
public:
const uint_least8_t Max_Timers;
};
//***************************************************************************
//***************************************************************************
template <uint_least8_t Max_Timers_, typename TSemaphore>
class callback_timer_atomic : public etl::icallback_timer_atomic<TSemaphore>
{
public:
ETL_STATIC_ASSERT(Max_Timers_ <= 254U, "No more than 254 timers are allowed");
//*******************************************
//*******************************************
callback_timer_atomic()
: icallback_timer_atomic<TSemaphore>(timer_array, Max_Timers_)
{
}
private:
typename etl::icallback_timer_atomic<TSemaphore>::timer_data timer_array[Max_Timers_];
};
} // namespace etl
#endif
algorithm.h
etl::callback_timer_atomic::callback_timer_atomic
callback_timer_atomic()
Constructor.
Definition callback_timer_atomic.h:680
etl::callback
Definition callback.h:46
etl::delegate
Declaration.
Definition delegate_cpp03.h:191
etl::icallback_timer_atomic
Interface for callback timer.
Definition callback_timer_atomic.h:49
etl::icallback_timer_atomic::set_mode
bool set_mode(etl::timer::id::type id_, bool repeating_)
Sets a timer's mode.
Definition callback_timer_atomic.h:293
etl::icallback_timer_atomic::register_timer
etl::timer::id::type register_timer(callback_type callback_, uint32_t period_, bool repeating_)
Register a timer.
Definition callback_timer_atomic.h:59
etl::icallback_timer_atomic::set_insert_callback
void set_insert_callback(event_callback_type insert_)
Set a callback when a timer is inserted on list.
Definition callback_timer_atomic.h:366
etl::icallback_timer_atomic::is_active
bool is_active(etl::timer::id::type id_) const
Definition callback_timer_atomic.h:339
etl::icallback_timer_atomic::is_running
bool is_running() const
Get the enable/disable state.
Definition callback_timer_atomic.h:129
etl::icallback_timer_atomic::time_to_next
uint32_t time_to_next() const
Definition callback_timer_atomic.h:321
etl::icallback_timer_atomic::icallback_timer_atomic
icallback_timer_atomic(timer_data *const timer_array_, const uint_least8_t Max_Timers_)
Constructor.
Definition callback_timer_atomic.h:457
etl::icallback_timer_atomic::stop
bool stop(etl::timer::id::type id_)
Stops a timer.
Definition callback_timer_atomic.h:249
etl::icallback_timer_atomic::has_active_timer
bool has_active_timer() const
Check if there is an active timer.
Definition callback_timer_atomic.h:307
etl::icallback_timer_atomic::start
bool start(etl::timer::id::type id_, bool immediate_=false)
Starts a timer.
Definition callback_timer_atomic.h:211
etl::icallback_timer_atomic::unregister_timer
bool unregister_timer(etl::timer::id::type id_)
Unregister a timer.
Definition callback_timer_atomic.h:89
etl::icallback_timer_atomic::enable
void enable(bool state_)
Enable/disable the timer.
Definition callback_timer_atomic.h:121
etl::icallback_timer_atomic::set_period
bool set_period(etl::timer::id::type id_, uint32_t period_)
Sets a timer's period.
Definition callback_timer_atomic.h:279
etl::icallback_timer_atomic::clear
void clear()
Clears the timer of data.
Definition callback_timer_atomic.h:137
etl::icallback_timer_atomic::set_remove_callback
void set_remove_callback(event_callback_type remove_)
Set a callback when a timer is removed from list.
Definition callback_timer_atomic.h:374
delegate.h
error_handler.h
etl
Definition absolute.h:40
placement_new.h
platform.h
etl::icallback_timer_atomic::timer_data
The configuration of a timer.
Definition callback_timer_atomic.h:396
etl::icallback_timer_atomic::timer_data::timer_data
timer_data(etl::timer::id::type id_, callback_type callback_, uint32_t period_, bool repeating_)
ETL delegate callback.
Definition callback_timer_atomic.h:412
etl::icallback_timer_atomic::timer_data::is_active
bool is_active() const
Returns true if the timer is active.
Definition callback_timer_atomic.h:426
etl::icallback_timer_atomic::timer_data::set_inactive
void set_inactive()
Sets the timer to the inactive state.
Definition callback_timer_atomic.h:434
etl::timer::id
Definition timer.h:88
etl::timer
Common definitions for the timer framework.
Definition timer.h:55