672 lines
18 KiB
C
672 lines
18 KiB
C
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/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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https://github.com/ETLCPP/etl
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https://www.etlcpp.com
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Copyright(c) 2022 John Wellbelove
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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******************************************************************************/
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#ifndef ETL_CALLBACK_TIMER_INTERRUPT_INCLUDED
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#define ETL_CALLBACK_TIMER_INTERRUPT_INCLUDED
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#include "platform.h"
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#include "algorithm.h"
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#include "nullptr.h"
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#include "delegate.h"
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#include "static_assert.h"
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#include "timer.h"
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#include "error_handler.h"
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#include "placement_new.h"
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#include <stdint.h>
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namespace etl
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{
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//***************************************************************************
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/// Interface for callback timer
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//***************************************************************************
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template <typename TInterruptGuard>
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class icallback_timer_interrupt
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{
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public:
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typedef etl::delegate<void(void)> callback_type;
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//*******************************************
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/// Register a timer.
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//*******************************************
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etl::timer::id::type register_timer(const callback_type& callback_,
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uint32_t period_,
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bool repeating_)
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{
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etl::timer::id::type id = etl::timer::id::NO_TIMER;
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bool is_space = (number_of_registered_timers < MAX_TIMERS);
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if (is_space)
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{
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// Search for the free space.
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for (uint_least8_t i = 0U; i < MAX_TIMERS; ++i)
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{
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timer_data& timer = timer_array[i];
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if (timer.id == etl::timer::id::NO_TIMER)
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{
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TInterruptGuard guard;
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(void)guard; // Silence 'unused variable warnings.
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// Create in-place.
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new (&timer) timer_data(i, callback_, period_, repeating_);
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++number_of_registered_timers;
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id = i;
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break;
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}
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}
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}
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return id;
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}
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//*******************************************
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/// Unregister a timer.
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//*******************************************
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bool unregister_timer(etl::timer::id::type id_)
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{
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bool result = false;
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if (id_ != etl::timer::id::NO_TIMER)
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{
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timer_data& timer = timer_array[id_];
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if (timer.id != etl::timer::id::NO_TIMER)
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{
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if (timer.is_active())
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{
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TInterruptGuard guard;
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(void)guard; // Silence 'unused variable warnings.
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active_list.remove(timer.id, false);
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}
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// Reset in-place.
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new (&timer) timer_data();
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--number_of_registered_timers;
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result = true;
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}
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}
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return result;
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}
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//*******************************************
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/// Enable/disable the timer.
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//*******************************************
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void enable(bool state_)
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{
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enabled = state_;
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}
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//*******************************************
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/// Get the enable/disable state.
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//*******************************************
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bool is_running() const
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{
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return enabled;
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}
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//*******************************************
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/// Clears the timer of data.
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//*******************************************
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void clear()
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{
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{
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TInterruptGuard guard;
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(void)guard; // Silence 'unused variable warnings.
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active_list.clear();
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number_of_registered_timers = 0;
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}
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for (uint8_t i = 0U; i < MAX_TIMERS; ++i)
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{
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::new (&timer_array[i]) timer_data();
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}
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}
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//*******************************************
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// Called by the timer service to indicate the
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// amount of time that has elapsed since the last successful call to 'tick'.
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// Returns true if the tick was processed,
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// false if not.
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//*******************************************
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bool tick(uint32_t count)
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{
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if (enabled)
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{
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// We have something to do?
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bool has_active = !active_list.empty();
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if (has_active)
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{
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while (has_active && (count >= active_list.front().delta))
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{
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timer_data& timer = active_list.front();
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count -= timer.delta;
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active_list.remove(timer.id, true);
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if (timer.callback.is_valid())
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{
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timer.callback();
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}
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if (timer.repeating)
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{
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// Reinsert the timer.
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timer.delta = timer.period;
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active_list.insert(timer.id);
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}
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has_active = !active_list.empty();
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}
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if (has_active)
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{
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// Subtract any remainder from the next due timeout.
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active_list.front().delta -= count;
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}
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}
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return true;
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}
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return false;
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}
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//*******************************************
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/// Starts a timer.
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//*******************************************
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bool start(etl::timer::id::type id_, bool immediate_ = false)
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{
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bool result = false;
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// Valid timer id?
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if (id_ != etl::timer::id::NO_TIMER)
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{
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timer_data& timer = timer_array[id_];
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// Registered timer?
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if (timer.id != etl::timer::id::NO_TIMER)
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{
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// Has a valid period.
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if (timer.period != etl::timer::state::Inactive)
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{
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TInterruptGuard guard;
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(void)guard; // Silence 'unused variable warnings.
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if (timer.is_active())
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{
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active_list.remove(timer.id, false);
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}
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timer.delta = immediate_ ? 0U : timer.period;
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active_list.insert(timer.id);
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result = true;
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}
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}
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}
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return result;
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}
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//*******************************************
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/// Stops a timer.
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//*******************************************
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bool stop(etl::timer::id::type id_)
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{
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bool result = false;
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// Valid timer id?
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if (id_ != etl::timer::id::NO_TIMER)
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{
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timer_data& timer = timer_array[id_];
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// Registered timer?
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if (timer.id != etl::timer::id::NO_TIMER)
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{
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if (timer.is_active())
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{
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TInterruptGuard guard;
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(void)guard; // Silence 'unused variable warnings.
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active_list.remove(timer.id, false);
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}
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result = true;
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}
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}
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return result;
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}
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//*******************************************
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/// Sets a timer's period.
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//*******************************************
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bool set_period(etl::timer::id::type id_, uint32_t period_)
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{
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if (stop(id_))
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{
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timer_array[id_].period = period_;
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return true;
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}
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return false;
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}
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//*******************************************
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/// Sets a timer's mode.
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//*******************************************
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bool set_mode(etl::timer::id::type id_, bool repeating_)
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{
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if (stop(id_))
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{
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timer_array[id_].repeating = repeating_;
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return true;
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}
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return false;
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}
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//*******************************************
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/// Check if there is an active timer.
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//*******************************************
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bool has_active_timer() const
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{
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TInterruptGuard guard;
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(void)guard; // Silence 'unused variable warnings.
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return !active_list.empty();
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}
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//*******************************************
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/// Get the time to the next timer event.
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/// Returns etl::timer::interval::No_Active_Interval if there is no active timer.
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//*******************************************
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uint32_t time_to_next() const
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{
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uint32_t delta = static_cast<uint32_t>(etl::timer::interval::No_Active_Interval);
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TInterruptGuard guard;
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(void)guard; // Silence 'unused variable warnings.
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if (!active_list.empty())
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{
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delta = active_list.front().delta;
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}
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return delta;
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}
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//*******************************************
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/// Checks if a timer is currently active.
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/// Returns <b>true</b> if the timer is active, otherwise <b>false</b>.
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//*******************************************
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bool is_active(etl::timer::id::type id_) const
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{
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// Valid timer id?
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if (is_valid_timer_id(id_))
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{
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if (has_active_timer())
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{
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TInterruptGuard guard;
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(void)guard; // Silence 'unused variable warnings.
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const timer_data& timer = timer_array[id_];
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// Registered timer?
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if (timer.id != etl::timer::id::NO_TIMER)
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{
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return timer.is_active();
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}
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}
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}
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return false;
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}
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protected:
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//*************************************************************************
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/// The configuration of a timer.
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struct timer_data
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{
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//*******************************************
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timer_data()
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: callback()
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, period(0U)
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, delta(etl::timer::state::Inactive)
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, id(etl::timer::id::NO_TIMER)
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, previous(etl::timer::id::NO_TIMER)
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, next(etl::timer::id::NO_TIMER)
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, repeating(true)
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{
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}
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//*******************************************
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/// ETL delegate callback
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//*******************************************
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timer_data(etl::timer::id::type id_,
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callback_type callback_,
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uint32_t period_,
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bool repeating_)
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: callback(callback_)
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, period(period_)
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, delta(etl::timer::state::Inactive)
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, id(id_)
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, previous(etl::timer::id::NO_TIMER)
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, next(etl::timer::id::NO_TIMER)
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, repeating(repeating_)
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{
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}
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//*******************************************
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/// Returns true if the timer is active.
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//*******************************************
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bool is_active() const
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{
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return delta != etl::timer::state::Inactive;
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}
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//*******************************************
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/// Sets the timer to the inactive state.
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//*******************************************
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void set_inactive()
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{
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delta = etl::timer::state::Inactive;
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}
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callback_type callback;
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uint32_t period;
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uint32_t delta;
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etl::timer::id::type id;
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uint_least8_t previous;
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uint_least8_t next;
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bool repeating;
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private:
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// Disabled.
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timer_data(const timer_data& other) ETL_DELETE;
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timer_data& operator =(const timer_data& other) ETL_DELETE;
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};
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//*******************************************
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/// Constructor.
|
||
|
|
//*******************************************
|
||
|
|
icallback_timer_interrupt(timer_data* const timer_array_, const uint_least8_t MAX_TIMERS_)
|
||
|
|
: timer_array(timer_array_)
|
||
|
|
, active_list(timer_array_)
|
||
|
|
, enabled(false)
|
||
|
|
, number_of_registered_timers(0U)
|
||
|
|
, MAX_TIMERS(MAX_TIMERS_)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
//*******************************************
|
||
|
|
/// Check that the timer id is valid.
|
||
|
|
//*******************************************
|
||
|
|
bool is_valid_timer_id(etl::timer::id::type id_) const
|
||
|
|
{
|
||
|
|
return (id_ < MAX_TIMERS);
|
||
|
|
}
|
||
|
|
|
||
|
|
//*************************************************************************
|
||
|
|
/// A specialised intrusive linked list for timer data.
|
||
|
|
//*************************************************************************
|
||
|
|
class timer_list
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
//*******************************
|
||
|
|
timer_list(timer_data* ptimers_)
|
||
|
|
: head(etl::timer::id::NO_TIMER)
|
||
|
|
, tail(etl::timer::id::NO_TIMER)
|
||
|
|
, current(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()
|
||
|
|
{
|
||
|
|
current = head;
|
||
|
|
return current;
|
||
|
|
}
|
||
|
|
|
||
|
|
//*******************************
|
||
|
|
etl::timer::id::type previous(etl::timer::id::type last)
|
||
|
|
{
|
||
|
|
current = ptimers[last].previous;
|
||
|
|
return current;
|
||
|
|
}
|
||
|
|
|
||
|
|
//*******************************
|
||
|
|
etl::timer::id::type next(etl::timer::id::type last)
|
||
|
|
{
|
||
|
|
current = ptimers[last].next;
|
||
|
|
return current;
|
||
|
|
}
|
||
|
|
|
||
|
|
//*******************************
|
||
|
|
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;
|
||
|
|
current = etl::timer::id::NO_TIMER;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
etl::timer::id::type head;
|
||
|
|
etl::timer::id::type tail;
|
||
|
|
etl::timer::id::type current;
|
||
|
|
|
||
|
|
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;
|
||
|
|
uint_least8_t number_of_registered_timers;
|
||
|
|
|
||
|
|
public:
|
||
|
|
|
||
|
|
const uint_least8_t MAX_TIMERS;
|
||
|
|
};
|
||
|
|
|
||
|
|
//***************************************************************************
|
||
|
|
/// The callback timer
|
||
|
|
//***************************************************************************
|
||
|
|
template <uint_least8_t MAX_TIMERS_, typename TInterruptGuard>
|
||
|
|
class callback_timer_interrupt : public etl::icallback_timer_interrupt<TInterruptGuard>
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
ETL_STATIC_ASSERT(MAX_TIMERS_ <= 254U, "No more than 254 timers are allowed");
|
||
|
|
|
||
|
|
typedef typename icallback_timer_interrupt<TInterruptGuard>::callback_type callback_type;
|
||
|
|
|
||
|
|
//*******************************************
|
||
|
|
/// Constructor.
|
||
|
|
//*******************************************
|
||
|
|
callback_timer_interrupt()
|
||
|
|
: icallback_timer_interrupt<TInterruptGuard>(timer_array, MAX_TIMERS_)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
typename icallback_timer_interrupt<TInterruptGuard>::timer_data timer_array[MAX_TIMERS_];
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|