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/** \addtogroup hal */
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/** @{*/
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/* mbed Microcontroller Library
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* Copyright (c) 2015 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBED_TICKER_API_H
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#define MBED_TICKER_API_H
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#include <stdint.h>
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#include <stdbool.h>
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#include "device.h"
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/**
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* Maximum delta (in us) between too interrupts.
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*/
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#define MBED_TICKER_INTERRUPT_TIMESTAMP_MAX_DELTA 0x70000000ULL
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/**
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* Legacy format representing a timestamp in us.
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* Given it is modeled as a 32 bit integer, this type can represent timestamp
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* up to 4294 seconds (71 minutes).
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* Prefer using us_timestamp_t which store timestamp as 64 bits integer.
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*/
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typedef uint32_t timestamp_t;
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/**
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* A us timestamp stored in a 64 bit integer.
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* Can store timestamp up to 584810 years.
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*/
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typedef uint64_t us_timestamp_t;
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/** Ticker's event structure
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*/
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typedef struct ticker_event_s {
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us_timestamp_t timestamp; /**< Event's timestamp */
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uint32_t id; /**< TimerEvent object */
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struct ticker_event_s *next; /**< Next event in the queue */
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} ticker_event_t;
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typedef void (*ticker_event_handler)(uint32_t id);
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/** Ticker's interface structure - required API for a ticker
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*/
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typedef struct {
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void (*init)(void); /**< Init function */
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uint32_t (*read)(void); /**< Read function */
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void (*disable_interrupt)(void); /**< Disable interrupt function */
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void (*clear_interrupt)(void); /**< Clear interrupt function */
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void (*set_interrupt)(timestamp_t timestamp); /**< Set interrupt function */
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void (*fire_interrupt)(void); /**< Fire interrupt right-away */
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} ticker_interface_t;
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/** Ticker's event queue structure
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*/
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typedef struct {
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ticker_event_handler event_handler; /**< Event handler */
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ticker_event_t *head; /**< A pointer to head */
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us_timestamp_t present_time; /**< Store the timestamp used for present time */
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bool initialized; /**< Indicate if the instance is initialized */
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} ticker_event_queue_t;
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/** Ticker's data structure
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*/
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typedef struct {
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const ticker_interface_t *interface; /**< Ticker's interface */
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ticker_event_queue_t *queue; /**< Ticker's event queue */
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} ticker_data_t;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \defgroup hal_ticker Ticker HAL functions
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* @{
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*/
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/** Initialize a ticker and set the event handler
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*
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* @param ticker The ticker object.
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* @param handler A handler to be set
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*/
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void ticker_set_handler(const ticker_data_t *const ticker, ticker_event_handler handler);
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/** IRQ handler that goes through the events to trigger overdue events.
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*
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* @param ticker The ticker object.
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*/
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void ticker_irq_handler(const ticker_data_t *const ticker);
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/** Remove an event from the queue
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*
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* @param ticker The ticker object.
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* @param obj The event object to be removed from the queue
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*/
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void ticker_remove_event(const ticker_data_t *const ticker, ticker_event_t *obj);
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/** Insert an event to the queue
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*
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* The event will be executed in timestamp - ticker_read().
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*
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* @warning This function does not consider timestamp in the past. If an event
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* is inserted with a timestamp less than the current timestamp then the event
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* will be executed in timestamp - ticker_read() us.
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* The internal counter wrap very quickly it is hard to decide weither an
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* event is in the past or in 1 hour.
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*
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* @note prefer the use of ticker_insert_event_us which allows registration of
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* absolute timestamp.
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*
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* @param ticker The ticker object.
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* @param obj The event object to be inserted to the queue
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* @param timestamp The event's timestamp
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* @param id The event object
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*/
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void ticker_insert_event(const ticker_data_t *const ticker, ticker_event_t *obj, timestamp_t timestamp, uint32_t id);
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/** Insert an event to the queue
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*
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* The event will be executed in timestamp - ticker_read_us() us.
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*
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* @warning If an event is inserted with a timestamp less than the current
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* timestamp then the event will **not** be inserted.
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*
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* @param ticker The ticker object.
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* @param obj The event object to be inserted to the queue
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* @param timestamp The event's timestamp
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* @param id The event object
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*/
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void ticker_insert_event_us(const ticker_data_t *const ticker, ticker_event_t *obj, us_timestamp_t timestamp, uint32_t id);
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/** Read the current (relative) ticker's timestamp
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*
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* @warning Return a relative timestamp because the counter wrap every 4294
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* seconds.
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*
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* @param ticker The ticker object.
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* @return The current timestamp
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*/
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timestamp_t ticker_read(const ticker_data_t *const ticker);
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/** Read the current (absolute) ticker's timestamp
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*
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* @warning Return an absolute timestamp counting from the initialization of the
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* ticker.
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*
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* @param ticker The ticker object.
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* @return The current timestamp
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*/
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us_timestamp_t ticker_read_us(const ticker_data_t *const ticker);
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/** Read the next event's timestamp
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*
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* @param ticker The ticker object.
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* @param timestamp The timestamp object.
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* @return 1 if timestamp is pending event, 0 if there's no event pending
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*/
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int ticker_get_next_timestamp(const ticker_data_t *const ticker, timestamp_t *timestamp);
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/**@}*/
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#ifdef __cplusplus
|
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}
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#endif
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#endif
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/** @}*/
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|