RTC auf true
hal/ticker_api.h@0:38ceb79fef03, 2018-11-28 (annotated)
- Committer:
- kevman
- Date:
- Wed Nov 28 15:10:15 2018 +0000
- Revision:
- 0:38ceb79fef03
RTC modified
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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kevman | 0:38ceb79fef03 | 1 | |
kevman | 0:38ceb79fef03 | 2 | /** \addtogroup hal */ |
kevman | 0:38ceb79fef03 | 3 | /** @{*/ |
kevman | 0:38ceb79fef03 | 4 | /* mbed Microcontroller Library |
kevman | 0:38ceb79fef03 | 5 | * Copyright (c) 2015 ARM Limited |
kevman | 0:38ceb79fef03 | 6 | * |
kevman | 0:38ceb79fef03 | 7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
kevman | 0:38ceb79fef03 | 8 | * you may not use this file except in compliance with the License. |
kevman | 0:38ceb79fef03 | 9 | * You may obtain a copy of the License at |
kevman | 0:38ceb79fef03 | 10 | * |
kevman | 0:38ceb79fef03 | 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
kevman | 0:38ceb79fef03 | 12 | * |
kevman | 0:38ceb79fef03 | 13 | * Unless required by applicable law or agreed to in writing, software |
kevman | 0:38ceb79fef03 | 14 | * distributed under the License is distributed on an "AS IS" BASIS, |
kevman | 0:38ceb79fef03 | 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
kevman | 0:38ceb79fef03 | 16 | * See the License for the specific language governing permissions and |
kevman | 0:38ceb79fef03 | 17 | * limitations under the License. |
kevman | 0:38ceb79fef03 | 18 | */ |
kevman | 0:38ceb79fef03 | 19 | #ifndef MBED_TICKER_API_H |
kevman | 0:38ceb79fef03 | 20 | #define MBED_TICKER_API_H |
kevman | 0:38ceb79fef03 | 21 | |
kevman | 0:38ceb79fef03 | 22 | #include <stdint.h> |
kevman | 0:38ceb79fef03 | 23 | #include <stdbool.h> |
kevman | 0:38ceb79fef03 | 24 | #include "device.h" |
kevman | 0:38ceb79fef03 | 25 | |
kevman | 0:38ceb79fef03 | 26 | /** |
kevman | 0:38ceb79fef03 | 27 | * Legacy format representing a timestamp in us. |
kevman | 0:38ceb79fef03 | 28 | * Given it is modeled as a 32 bit integer, this type can represent timestamp |
kevman | 0:38ceb79fef03 | 29 | * up to 4294 seconds (71 minutes). |
kevman | 0:38ceb79fef03 | 30 | * Prefer using us_timestamp_t which store timestamp as 64 bits integer. |
kevman | 0:38ceb79fef03 | 31 | */ |
kevman | 0:38ceb79fef03 | 32 | typedef uint32_t timestamp_t; |
kevman | 0:38ceb79fef03 | 33 | |
kevman | 0:38ceb79fef03 | 34 | /** |
kevman | 0:38ceb79fef03 | 35 | * A us timestamp stored in a 64 bit integer. |
kevman | 0:38ceb79fef03 | 36 | * Can store timestamp up to 584810 years. |
kevman | 0:38ceb79fef03 | 37 | */ |
kevman | 0:38ceb79fef03 | 38 | typedef uint64_t us_timestamp_t; |
kevman | 0:38ceb79fef03 | 39 | |
kevman | 0:38ceb79fef03 | 40 | /** Ticker's event structure |
kevman | 0:38ceb79fef03 | 41 | */ |
kevman | 0:38ceb79fef03 | 42 | typedef struct ticker_event_s { |
kevman | 0:38ceb79fef03 | 43 | us_timestamp_t timestamp; /**< Event's timestamp */ |
kevman | 0:38ceb79fef03 | 44 | uint32_t id; /**< TimerEvent object */ |
kevman | 0:38ceb79fef03 | 45 | struct ticker_event_s *next; /**< Next event in the queue */ |
kevman | 0:38ceb79fef03 | 46 | } ticker_event_t; |
kevman | 0:38ceb79fef03 | 47 | |
kevman | 0:38ceb79fef03 | 48 | typedef void (*ticker_event_handler)(uint32_t id); |
kevman | 0:38ceb79fef03 | 49 | |
kevman | 0:38ceb79fef03 | 50 | /** Information about the ticker implementation |
kevman | 0:38ceb79fef03 | 51 | */ |
kevman | 0:38ceb79fef03 | 52 | typedef struct { |
kevman | 0:38ceb79fef03 | 53 | uint32_t frequency; /**< Frequency in Hz this ticker runs at */ |
kevman | 0:38ceb79fef03 | 54 | uint32_t bits; /**< Number of bits this ticker supports */ |
kevman | 0:38ceb79fef03 | 55 | } ticker_info_t; |
kevman | 0:38ceb79fef03 | 56 | |
kevman | 0:38ceb79fef03 | 57 | |
kevman | 0:38ceb79fef03 | 58 | /** Ticker's interface structure - required API for a ticker |
kevman | 0:38ceb79fef03 | 59 | */ |
kevman | 0:38ceb79fef03 | 60 | typedef struct { |
kevman | 0:38ceb79fef03 | 61 | void (*init)(void); /**< Init function */ |
kevman | 0:38ceb79fef03 | 62 | uint32_t (*read)(void); /**< Read function */ |
kevman | 0:38ceb79fef03 | 63 | void (*disable_interrupt)(void); /**< Disable interrupt function */ |
kevman | 0:38ceb79fef03 | 64 | void (*clear_interrupt)(void); /**< Clear interrupt function */ |
kevman | 0:38ceb79fef03 | 65 | void (*set_interrupt)(timestamp_t timestamp); /**< Set interrupt function */ |
kevman | 0:38ceb79fef03 | 66 | void (*fire_interrupt)(void); /**< Fire interrupt right-away */ |
kevman | 0:38ceb79fef03 | 67 | void (*free)(void); /**< Disable function */ |
kevman | 0:38ceb79fef03 | 68 | const ticker_info_t *(*get_info)(void); /**< Return info about this ticker's implementation */ |
kevman | 0:38ceb79fef03 | 69 | } ticker_interface_t; |
kevman | 0:38ceb79fef03 | 70 | |
kevman | 0:38ceb79fef03 | 71 | /** Ticker's event queue structure |
kevman | 0:38ceb79fef03 | 72 | */ |
kevman | 0:38ceb79fef03 | 73 | typedef struct { |
kevman | 0:38ceb79fef03 | 74 | ticker_event_handler event_handler; /**< Event handler */ |
kevman | 0:38ceb79fef03 | 75 | ticker_event_t *head; /**< A pointer to head */ |
kevman | 0:38ceb79fef03 | 76 | uint32_t frequency; /**< Frequency of the timer in Hz */ |
kevman | 0:38ceb79fef03 | 77 | uint32_t bitmask; /**< Mask to be applied to time values read */ |
kevman | 0:38ceb79fef03 | 78 | uint32_t max_delta; /**< Largest delta in ticks that can be used when scheduling */ |
kevman | 0:38ceb79fef03 | 79 | uint64_t max_delta_us; /**< Largest delta in us that can be used when scheduling */ |
kevman | 0:38ceb79fef03 | 80 | uint32_t tick_last_read; /**< Last tick read */ |
kevman | 0:38ceb79fef03 | 81 | uint64_t tick_remainder; /**< Ticks that have not been added to base_time */ |
kevman | 0:38ceb79fef03 | 82 | us_timestamp_t present_time; /**< Store the timestamp used for present time */ |
kevman | 0:38ceb79fef03 | 83 | bool initialized; /**< Indicate if the instance is initialized */ |
kevman | 0:38ceb79fef03 | 84 | bool dispatching; /**< The function ticker_irq_handler is dispatching */ |
kevman | 0:38ceb79fef03 | 85 | bool suspended; /**< Indicate if the instance is suspended */ |
kevman | 0:38ceb79fef03 | 86 | uint8_t frequency_shifts; /**< If frequency is a value of 2^n, this is n, otherwise 0 */ |
kevman | 0:38ceb79fef03 | 87 | } ticker_event_queue_t; |
kevman | 0:38ceb79fef03 | 88 | |
kevman | 0:38ceb79fef03 | 89 | /** Ticker's data structure |
kevman | 0:38ceb79fef03 | 90 | */ |
kevman | 0:38ceb79fef03 | 91 | typedef struct { |
kevman | 0:38ceb79fef03 | 92 | const ticker_interface_t *interface; /**< Ticker's interface */ |
kevman | 0:38ceb79fef03 | 93 | ticker_event_queue_t *queue; /**< Ticker's event queue */ |
kevman | 0:38ceb79fef03 | 94 | } ticker_data_t; |
kevman | 0:38ceb79fef03 | 95 | |
kevman | 0:38ceb79fef03 | 96 | #ifdef __cplusplus |
kevman | 0:38ceb79fef03 | 97 | extern "C" { |
kevman | 0:38ceb79fef03 | 98 | #endif |
kevman | 0:38ceb79fef03 | 99 | |
kevman | 0:38ceb79fef03 | 100 | /** |
kevman | 0:38ceb79fef03 | 101 | * \defgroup hal_ticker Ticker HAL functions |
kevman | 0:38ceb79fef03 | 102 | * @{ |
kevman | 0:38ceb79fef03 | 103 | */ |
kevman | 0:38ceb79fef03 | 104 | |
kevman | 0:38ceb79fef03 | 105 | /** Initialize a ticker and set the event handler |
kevman | 0:38ceb79fef03 | 106 | * |
kevman | 0:38ceb79fef03 | 107 | * @param ticker The ticker object. |
kevman | 0:38ceb79fef03 | 108 | * @param handler A handler to be set |
kevman | 0:38ceb79fef03 | 109 | */ |
kevman | 0:38ceb79fef03 | 110 | void ticker_set_handler(const ticker_data_t *const ticker, ticker_event_handler handler); |
kevman | 0:38ceb79fef03 | 111 | |
kevman | 0:38ceb79fef03 | 112 | /** IRQ handler that goes through the events to trigger overdue events. |
kevman | 0:38ceb79fef03 | 113 | * |
kevman | 0:38ceb79fef03 | 114 | * @param ticker The ticker object. |
kevman | 0:38ceb79fef03 | 115 | */ |
kevman | 0:38ceb79fef03 | 116 | void ticker_irq_handler(const ticker_data_t *const ticker); |
kevman | 0:38ceb79fef03 | 117 | |
kevman | 0:38ceb79fef03 | 118 | /** Remove an event from the queue |
kevman | 0:38ceb79fef03 | 119 | * |
kevman | 0:38ceb79fef03 | 120 | * @param ticker The ticker object. |
kevman | 0:38ceb79fef03 | 121 | * @param obj The event object to be removed from the queue |
kevman | 0:38ceb79fef03 | 122 | */ |
kevman | 0:38ceb79fef03 | 123 | void ticker_remove_event(const ticker_data_t *const ticker, ticker_event_t *obj); |
kevman | 0:38ceb79fef03 | 124 | |
kevman | 0:38ceb79fef03 | 125 | /** Insert an event to the queue |
kevman | 0:38ceb79fef03 | 126 | * |
kevman | 0:38ceb79fef03 | 127 | * The event will be executed in timestamp - ticker_read(). |
kevman | 0:38ceb79fef03 | 128 | * |
kevman | 0:38ceb79fef03 | 129 | * @warning This function does not consider timestamp in the past. If an event |
kevman | 0:38ceb79fef03 | 130 | * is inserted with a timestamp less than the current timestamp then the event |
kevman | 0:38ceb79fef03 | 131 | * will be executed in timestamp - ticker_read() us. |
kevman | 0:38ceb79fef03 | 132 | * The internal counter wrap very quickly it is hard to decide weither an |
kevman | 0:38ceb79fef03 | 133 | * event is in the past or in 1 hour. |
kevman | 0:38ceb79fef03 | 134 | * |
kevman | 0:38ceb79fef03 | 135 | * @note prefer the use of ticker_insert_event_us which allows registration of |
kevman | 0:38ceb79fef03 | 136 | * absolute timestamp. |
kevman | 0:38ceb79fef03 | 137 | * |
kevman | 0:38ceb79fef03 | 138 | * @param ticker The ticker object. |
kevman | 0:38ceb79fef03 | 139 | * @param obj The event object to be inserted to the queue |
kevman | 0:38ceb79fef03 | 140 | * @param timestamp The event's timestamp |
kevman | 0:38ceb79fef03 | 141 | * @param id The event object |
kevman | 0:38ceb79fef03 | 142 | */ |
kevman | 0:38ceb79fef03 | 143 | void ticker_insert_event(const ticker_data_t *const ticker, ticker_event_t *obj, timestamp_t timestamp, uint32_t id); |
kevman | 0:38ceb79fef03 | 144 | |
kevman | 0:38ceb79fef03 | 145 | /** Insert an event to the queue |
kevman | 0:38ceb79fef03 | 146 | * |
kevman | 0:38ceb79fef03 | 147 | * The event will be executed in timestamp - ticker_read_us() us. |
kevman | 0:38ceb79fef03 | 148 | * |
kevman | 0:38ceb79fef03 | 149 | * @note If an event is inserted with a timestamp less than the current |
kevman | 0:38ceb79fef03 | 150 | * timestamp then the event will be scheduled immediately resulting in |
kevman | 0:38ceb79fef03 | 151 | * an instant call to event handler. |
kevman | 0:38ceb79fef03 | 152 | * |
kevman | 0:38ceb79fef03 | 153 | * @param ticker The ticker object. |
kevman | 0:38ceb79fef03 | 154 | * @param obj The event object to be inserted to the queue |
kevman | 0:38ceb79fef03 | 155 | * @param timestamp The event's timestamp |
kevman | 0:38ceb79fef03 | 156 | * @param id The event object |
kevman | 0:38ceb79fef03 | 157 | */ |
kevman | 0:38ceb79fef03 | 158 | void ticker_insert_event_us(const ticker_data_t *const ticker, ticker_event_t *obj, us_timestamp_t timestamp, uint32_t id); |
kevman | 0:38ceb79fef03 | 159 | |
kevman | 0:38ceb79fef03 | 160 | /** Read the current (relative) ticker's timestamp |
kevman | 0:38ceb79fef03 | 161 | * |
kevman | 0:38ceb79fef03 | 162 | * @warning Return a relative timestamp because the counter wrap every 4294 |
kevman | 0:38ceb79fef03 | 163 | * seconds. |
kevman | 0:38ceb79fef03 | 164 | * |
kevman | 0:38ceb79fef03 | 165 | * @param ticker The ticker object. |
kevman | 0:38ceb79fef03 | 166 | * @return The current timestamp |
kevman | 0:38ceb79fef03 | 167 | */ |
kevman | 0:38ceb79fef03 | 168 | timestamp_t ticker_read(const ticker_data_t *const ticker); |
kevman | 0:38ceb79fef03 | 169 | |
kevman | 0:38ceb79fef03 | 170 | /** Read the current (absolute) ticker's timestamp |
kevman | 0:38ceb79fef03 | 171 | * |
kevman | 0:38ceb79fef03 | 172 | * @warning Return an absolute timestamp counting from the initialization of the |
kevman | 0:38ceb79fef03 | 173 | * ticker. |
kevman | 0:38ceb79fef03 | 174 | * |
kevman | 0:38ceb79fef03 | 175 | * @param ticker The ticker object. |
kevman | 0:38ceb79fef03 | 176 | * @return The current timestamp |
kevman | 0:38ceb79fef03 | 177 | */ |
kevman | 0:38ceb79fef03 | 178 | us_timestamp_t ticker_read_us(const ticker_data_t *const ticker); |
kevman | 0:38ceb79fef03 | 179 | |
kevman | 0:38ceb79fef03 | 180 | /** Read the next event's timestamp |
kevman | 0:38ceb79fef03 | 181 | * |
kevman | 0:38ceb79fef03 | 182 | * @param ticker The ticker object. |
kevman | 0:38ceb79fef03 | 183 | * @param timestamp The timestamp object. |
kevman | 0:38ceb79fef03 | 184 | * @return 1 if timestamp is pending event, 0 if there's no event pending |
kevman | 0:38ceb79fef03 | 185 | */ |
kevman | 0:38ceb79fef03 | 186 | int ticker_get_next_timestamp(const ticker_data_t *const ticker, timestamp_t *timestamp); |
kevman | 0:38ceb79fef03 | 187 | |
kevman | 0:38ceb79fef03 | 188 | /** Suspend this ticker |
kevman | 0:38ceb79fef03 | 189 | * |
kevman | 0:38ceb79fef03 | 190 | * When suspended reads will always return the same time and no |
kevman | 0:38ceb79fef03 | 191 | * events will be dispatched. When suspended the common layer |
kevman | 0:38ceb79fef03 | 192 | * will only ever call the interface function clear_interrupt() |
kevman | 0:38ceb79fef03 | 193 | * and that is only if ticker_irq_handler is called. |
kevman | 0:38ceb79fef03 | 194 | * |
kevman | 0:38ceb79fef03 | 195 | * |
kevman | 0:38ceb79fef03 | 196 | * @param ticker The ticker object. |
kevman | 0:38ceb79fef03 | 197 | */ |
kevman | 0:38ceb79fef03 | 198 | void ticker_suspend(const ticker_data_t *const ticker); |
kevman | 0:38ceb79fef03 | 199 | |
kevman | 0:38ceb79fef03 | 200 | /** Resume this ticker |
kevman | 0:38ceb79fef03 | 201 | * |
kevman | 0:38ceb79fef03 | 202 | * When resumed the ticker will ignore any time that has passed |
kevman | 0:38ceb79fef03 | 203 | * and continue counting up where it left off. |
kevman | 0:38ceb79fef03 | 204 | * |
kevman | 0:38ceb79fef03 | 205 | * @param ticker The ticker object. |
kevman | 0:38ceb79fef03 | 206 | */ |
kevman | 0:38ceb79fef03 | 207 | void ticker_resume(const ticker_data_t *const ticker); |
kevman | 0:38ceb79fef03 | 208 | |
kevman | 0:38ceb79fef03 | 209 | /* Private functions |
kevman | 0:38ceb79fef03 | 210 | * |
kevman | 0:38ceb79fef03 | 211 | * @cond PRIVATE |
kevman | 0:38ceb79fef03 | 212 | * |
kevman | 0:38ceb79fef03 | 213 | */ |
kevman | 0:38ceb79fef03 | 214 | |
kevman | 0:38ceb79fef03 | 215 | int _ticker_match_interval_passed(timestamp_t prev_tick, timestamp_t cur_tick, timestamp_t match_tick); |
kevman | 0:38ceb79fef03 | 216 | |
kevman | 0:38ceb79fef03 | 217 | /* |
kevman | 0:38ceb79fef03 | 218 | * @endcond PRIVATE |
kevman | 0:38ceb79fef03 | 219 | * |
kevman | 0:38ceb79fef03 | 220 | */ |
kevman | 0:38ceb79fef03 | 221 | |
kevman | 0:38ceb79fef03 | 222 | /**@}*/ |
kevman | 0:38ceb79fef03 | 223 | |
kevman | 0:38ceb79fef03 | 224 | #ifdef __cplusplus |
kevman | 0:38ceb79fef03 | 225 | } |
kevman | 0:38ceb79fef03 | 226 | #endif |
kevman | 0:38ceb79fef03 | 227 | |
kevman | 0:38ceb79fef03 | 228 | #endif |
kevman | 0:38ceb79fef03 | 229 | |
kevman | 0:38ceb79fef03 | 230 | /** @}*/ |