1 | /* mbed Microcontroller Library
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2 | * Copyright (c) 2015 ARM Limited
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | */
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16 | #ifndef MBED_TICKER_API_H
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17 | #define MBED_TICKER_API_H
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18 |
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19 | #include "device.h"
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20 |
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21 | typedef uint32_t timestamp_t;
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22 |
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23 | /** Ticker's event structure
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24 | */
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25 | typedef struct ticker_event_s {
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26 | timestamp_t timestamp; /**< Event's timestamp */
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27 | uint32_t id; /**< TimerEvent object */
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28 | struct ticker_event_s *next; /**< Next event in the queue */
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29 | } ticker_event_t;
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30 |
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31 | typedef void (*ticker_event_handler)(uint32_t id);
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32 |
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33 | /** Ticker's interface structure - required API for a ticker
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34 | */
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35 | typedef struct {
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36 | void (*init)(void); /**< Init function */
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37 | uint32_t (*read)(void); /**< Read function */
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38 | void (*disable_interrupt)(void); /**< Disable interrupt function */
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39 | void (*clear_interrupt)(void); /**< Clear interrupt function */
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40 | void (*set_interrupt)(timestamp_t timestamp); /**< Set interrupt function */
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41 | } ticker_interface_t;
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42 |
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43 | /** Tickers events queue structure
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44 | */
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45 | typedef struct {
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46 | ticker_event_handler event_handler; /**< Event handler */
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47 | ticker_event_t *head; /**< A pointer to head */
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48 | } ticker_event_queue_t;
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49 |
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50 | /** Tickers data structure
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51 | */
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52 | typedef struct {
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53 | const ticker_interface_t *interface; /**< Ticker's interface */
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54 | ticker_event_queue_t *queue; /**< Ticker's events queue */
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55 | } ticker_data_t;
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56 |
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57 | #ifdef __cplusplus
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58 | extern "C" {
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59 | #endif
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60 |
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61 | /** Initialize a ticker and sets the event handler
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62 | *
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63 | * @param data The ticker's data
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64 | * @param handler A handler to be set
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65 | */
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66 | void ticker_set_handler(const ticker_data_t *const data, ticker_event_handler handler);
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67 |
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68 | /** Irq handler which goes through the events to trigger events in the past.
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69 | *
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70 | * @param data The ticker's data
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71 | */
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72 | void ticker_irq_handler(const ticker_data_t *const data);
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73 |
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74 | /** Remove an event from the queue
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75 | *
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76 | * @param data The ticker's data
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77 | * @param obj The event's queue to be removed
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78 | */
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79 | void ticker_remove_event(const ticker_data_t *const data, ticker_event_t *obj);
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80 |
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81 | /** Insert an event from the queue
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82 | *
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83 | * @param data The ticker's data
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84 | * @param obj The event's queue to be removed
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85 | * @param timestamp The event's timestamp
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86 | * @param id The event object
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87 | */
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88 | void ticker_insert_event(const ticker_data_t *const data, ticker_event_t *obj, timestamp_t timestamp, uint32_t id);
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89 |
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90 | /** Read the current ticker's timestamp
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91 | *
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92 | * @param data The ticker's data
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93 | * @return The current timestamp
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94 | */
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95 | timestamp_t ticker_read(const ticker_data_t *const data);
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96 |
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97 | /** Read the next event's timestamp
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98 | *
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99 | * @param data The ticker's data
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100 | * @return 1 if timestamp is pending event, 0 if there's no event pending
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101 | */
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102 | int ticker_get_next_timestamp(const ticker_data_t *const data, timestamp_t *timestamp);
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103 |
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104 | #ifdef __cplusplus
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105 | }
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106 | #endif
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107 |
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108 | #endif
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