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126 lines
3.8 KiB
126 lines
3.8 KiB
4 years ago
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/**
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* \file
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*
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* \brief Events declaration.
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*
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* Copyright (C) 2015 Atmel Corporation. All rights reserved.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of Atmel may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* 4. This software may only be redistributed and used in connection with an
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* Atmel microcontroller product.
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*
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* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* \asf_license_stop
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*
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*/
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#ifndef _UTILS_EVENT_H_INCLUDED
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#define _UTILS_EVENT_H_INCLUDED
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <utils.h>
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#include <utils_list.h>
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#include <events.h>
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/**
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* \brief The maximum amount of events
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*/
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#define EVENT_MAX_AMOUNT 8
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/**
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* \brief The size of event mask used, it is EVENT_MAX_AMOUNT rounded up to the
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* closest number divisible by 8.
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*/
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#define EVENT_MASK_SIZE (round_up(EVENT_MAX_AMOUNT, 8))
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/**
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* \brief The type of event ID. IDs should start with 0 and be in numerical order.
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*/
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typedef uint8_t event_id_t;
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/**
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* \brief The type of returned parameter. This type is big enough to contain
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* pointer to data on any platform.
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*/
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typedef uintptr_t event_data_t;
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/**
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* \brief The type of returned parameter. This type is big enough to contain
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* pointer to data on any platform.
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*/
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typedef void (*event_cb_t)(event_id_t id, event_data_t data);
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/**
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* \brief Event structure
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*/
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struct event {
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struct list_element elem; /*! The pointer to next event */
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uint8_t mask[EVENT_MASK_SIZE]; /*! Mask of event IDs callback is called for */
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event_cb_t cb; /*! Callback to be called when an event occurs */
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};
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/**
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* \brief Subscribe to event
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*
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* \param[in] event The pointer to event structure
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* \param[in] id The event ID to subscribe to
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* \param[in] cb The callback function to call when the given event occurs
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*
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* \return The status of subscription
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*/
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int32_t event_subscribe(struct event *const event, const event_id_t id, event_cb_t cb);
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/**
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* \brief Remove event from subscription
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*
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* \param[in] event The pointer to event structure
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* \param[in] id The event ID to remove subscription from
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*
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* \return The status of subscription removing
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*/
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int32_t event_unsubscribe(struct event *const event, const event_id_t id);
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/**
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* \brief Post event
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*
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* \param[in] id The event ID to post
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* \param[in] data The event data to be passed to event subscribers
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*/
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void event_post(const event_id_t id, const event_data_t data);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _UTILS_EVENT_H_INCLUDED */
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