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Diff: hal/ticker_api.h
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- 525:c320967f86b9
diff -r c0134becc221 -r c320967f86b9 hal/ticker_api.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/hal/ticker_api.h Tue Apr 28 11:45:12 2015 +0100 @@ -0,0 +1,108 @@ +/* mbed Microcontroller Library + * Copyright (c) 2015 ARM Limited + * + * 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. + */ +#ifndef MBED_TICKER_API_H +#define MBED_TICKER_API_H + +#include "device.h" + +typedef uint32_t timestamp_t; + +/** Ticker's event structure + */ +typedef struct ticker_event_s { + timestamp_t timestamp; /**< Event's timestamp */ + uint32_t id; /**< TimerEvent object */ + struct ticker_event_s *next; /**< Next event in the queue */ +} ticker_event_t; + +typedef void (*ticker_event_handler)(uint32_t id); + +/** Ticker's interface structure - required API for a ticker + */ +typedef struct { + void (*init)(void); /**< Init function */ + uint32_t (*read)(void); /**< Read function */ + void (*disable_interrupt)(void); /**< Disable interrupt function */ + void (*clear_interrupt)(void); /**< Clear interrupt function */ + void (*set_interrupt)(timestamp_t timestamp); /**< Set interrupt function */ +} ticker_interface_t; + +/** Tickers events queue structure + */ +typedef struct { + ticker_event_handler event_handler; /**< Event handler */ + ticker_event_t *head; /**< A pointer to head */ +} ticker_event_queue_t; + +/** Tickers data structure + */ +typedef struct { + const ticker_interface_t *interface; /**< Ticker's interface */ + ticker_event_queue_t *queue; /**< Ticker's events queue */ +} ticker_data_t; + +#ifdef __cplusplus +extern "C" { +#endif + +/** Initialize a ticker and sets the event handler + * + * @param data The ticker's data + * @param handler A handler to be set + */ +void ticker_set_handler(const ticker_data_t *const data, ticker_event_handler handler); + +/** Irq handler which goes through the events to trigger events in the past. + * + * @param data The ticker's data + */ +void ticker_irq_handler(const ticker_data_t *const data); + +/** Remove an event from the queue + * + * @param data The ticker's data + * @param obj The event's queue to be removed + */ +void ticker_remove_event(const ticker_data_t *const data, ticker_event_t *obj); + +/** Insert an event from the queue + * + * @param data The ticker's data + * @param obj The event's queue to be removed + * @param timestamp The event's timestamp + * @param id The event object + */ +void ticker_insert_event(const ticker_data_t *const data, ticker_event_t *obj, timestamp_t timestamp, uint32_t id); + +/** Read the current ticker's timestamp + * + * @param data The ticker's data + * @return The current timestamp + */ +timestamp_t ticker_read(const ticker_data_t *const data); + +/** Read the next event's timestamp + * + * @param data The ticker's data + * @return 1 if timestamp is pending event, 0 if there's no event pending + */ +int ticker_get_next_timestamp(const ticker_data_t *const data, timestamp_t *timestamp); + +#ifdef __cplusplus +} +#endif + +#endif