Pedro Correia / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

hal/ticker_api.h@187:fa51feb62426, 2018-10-09 (annotated)

Committer:
pmcorreia
Date:
Tue Oct 09 14:42:37 2018 +0000
Revision:
187:fa51feb62426
Parent:
186:707f6e361f3e 
Updated version to work with F446RE

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1
<> 149:156823d33999 2 /** \addtogroup hal */
<> 149:156823d33999 3 /** @{*/
<> 144:ef7eb2e8f9f7 4 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 5 * Copyright (c) 2015 ARM Limited
<> 144:ef7eb2e8f9f7 6 *
<> 144:ef7eb2e8f9f7 7 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 8 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 9 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 10 *
<> 144:ef7eb2e8f9f7 11 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 12 *
<> 144:ef7eb2e8f9f7 13 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 14 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 16 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 17 * limitations under the License.
<> 144:ef7eb2e8f9f7 18 */
<> 144:ef7eb2e8f9f7 19 #ifndef MBED_TICKER_API_H
<> 144:ef7eb2e8f9f7 20 #define MBED_TICKER_API_H
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 #include <stdint.h>
AnnaBridge 167:e84263d55307 23 #include <stdbool.h>
<> 144:ef7eb2e8f9f7 24 #include "device.h"
<> 144:ef7eb2e8f9f7 25
AnnaBridge 167:e84263d55307 26 /**
AnnaBridge 167:e84263d55307 27 * Legacy format representing a timestamp in us.
AnnaBridge 167:e84263d55307 28 * Given it is modeled as a 32 bit integer, this type can represent timestamp
AnnaBridge 167:e84263d55307 29 * up to 4294 seconds (71 minutes).
AnnaBridge 167:e84263d55307 30 * Prefer using us_timestamp_t which store timestamp as 64 bits integer.
AnnaBridge 167:e84263d55307 31 */
<> 144:ef7eb2e8f9f7 32 typedef uint32_t timestamp_t;
<> 144:ef7eb2e8f9f7 33
AnnaBridge 167:e84263d55307 34 /**
AnnaBridge 167:e84263d55307 35 * A us timestamp stored in a 64 bit integer.
AnnaBridge 167:e84263d55307 36 * Can store timestamp up to 584810 years.
AnnaBridge 167:e84263d55307 37 */
AnnaBridge 167:e84263d55307 38 typedef uint64_t us_timestamp_t;
AnnaBridge 167:e84263d55307 39
<> 144:ef7eb2e8f9f7 40 /** Ticker's event structure
<> 144:ef7eb2e8f9f7 41 */
<> 144:ef7eb2e8f9f7 42 typedef struct ticker_event_s {
AnnaBridge 167:e84263d55307 43 us_timestamp_t timestamp; /**< Event's timestamp */
<> 144:ef7eb2e8f9f7 44 uint32_t id; /**< TimerEvent object */
<> 144:ef7eb2e8f9f7 45 struct ticker_event_s *next; /**< Next event in the queue */
<> 144:ef7eb2e8f9f7 46 } ticker_event_t;
<> 144:ef7eb2e8f9f7 47
<> 144:ef7eb2e8f9f7 48 typedef void (*ticker_event_handler)(uint32_t id);
<> 144:ef7eb2e8f9f7 49
Anna Bridge 180:96ed750bd169 50 /** Information about the ticker implementation
Anna Bridge 180:96ed750bd169 51 */
Anna Bridge 180:96ed750bd169 52 typedef struct {
Anna Bridge 180:96ed750bd169 53 uint32_t frequency; /**< Frequency in Hz this ticker runs at */
Anna Bridge 180:96ed750bd169 54 uint32_t bits; /**< Number of bits this ticker supports */
Anna Bridge 180:96ed750bd169 55 } ticker_info_t;
Anna Bridge 180:96ed750bd169 56
Anna Bridge 180:96ed750bd169 57
<> 144:ef7eb2e8f9f7 58 /** Ticker's interface structure - required API for a ticker
<> 144:ef7eb2e8f9f7 59 */
<> 144:ef7eb2e8f9f7 60 typedef struct {
<> 144:ef7eb2e8f9f7 61 void (*init)(void); /**< Init function */
<> 144:ef7eb2e8f9f7 62 uint32_t (*read)(void); /**< Read function */
<> 144:ef7eb2e8f9f7 63 void (*disable_interrupt)(void); /**< Disable interrupt function */
<> 144:ef7eb2e8f9f7 64 void (*clear_interrupt)(void); /**< Clear interrupt function */
<> 144:ef7eb2e8f9f7 65 void (*set_interrupt)(timestamp_t timestamp); /**< Set interrupt function */
AnnaBridge 174:b96e65c34a4d 66 void (*fire_interrupt)(void); /**< Fire interrupt right-away */
Anna Bridge 180:96ed750bd169 67 const ticker_info_t *(*get_info)(void); /**< Return info about this ticker's implementation */
<> 144:ef7eb2e8f9f7 68 } ticker_interface_t;
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 /** Ticker's event queue structure
<> 144:ef7eb2e8f9f7 71 */
<> 144:ef7eb2e8f9f7 72 typedef struct {
<> 144:ef7eb2e8f9f7 73 ticker_event_handler event_handler; /**< Event handler */
<> 144:ef7eb2e8f9f7 74 ticker_event_t *head; /**< A pointer to head */
Anna Bridge 180:96ed750bd169 75 uint32_t frequency; /**< Frequency of the timer in Hz */
Anna Bridge 180:96ed750bd169 76 uint32_t bitmask; /**< Mask to be applied to time values read */
Anna Bridge 180:96ed750bd169 77 uint32_t max_delta; /**< Largest delta in ticks that can be used when scheduling */
Anna Bridge 180:96ed750bd169 78 uint64_t max_delta_us; /**< Largest delta in us that can be used when scheduling */
Anna Bridge 180:96ed750bd169 79 uint32_t tick_last_read; /**< Last tick read */
Anna Bridge 180:96ed750bd169 80 uint64_t tick_remainder; /**< Ticks that have not been added to base_time */
AnnaBridge 167:e84263d55307 81 us_timestamp_t present_time; /**< Store the timestamp used for present time */
AnnaBridge 167:e84263d55307 82 bool initialized; /**< Indicate if the instance is initialized */
Anna Bridge 186:707f6e361f3e 83 uint8_t frequency_shifts; /**< If frequency is a value of 2^n, this is n, otherwise 0 */
<> 144:ef7eb2e8f9f7 84 } ticker_event_queue_t;
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 /** Ticker's data structure
<> 144:ef7eb2e8f9f7 87 */
<> 144:ef7eb2e8f9f7 88 typedef struct {
<> 144:ef7eb2e8f9f7 89 const ticker_interface_t *interface; /**< Ticker's interface */
<> 144:ef7eb2e8f9f7 90 ticker_event_queue_t *queue; /**< Ticker's event queue */
<> 144:ef7eb2e8f9f7 91 } ticker_data_t;
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 #ifdef __cplusplus
<> 144:ef7eb2e8f9f7 94 extern "C" {
<> 144:ef7eb2e8f9f7 95 #endif
<> 144:ef7eb2e8f9f7 96
<> 144:ef7eb2e8f9f7 97 /**
<> 144:ef7eb2e8f9f7 98 * \defgroup hal_ticker Ticker HAL functions
<> 144:ef7eb2e8f9f7 99 * @{
<> 144:ef7eb2e8f9f7 100 */
<> 144:ef7eb2e8f9f7 101
<> 144:ef7eb2e8f9f7 102 /** Initialize a ticker and set the event handler
<> 144:ef7eb2e8f9f7 103 *
AnnaBridge 167:e84263d55307 104 * @param ticker The ticker object.
<> 144:ef7eb2e8f9f7 105 * @param handler A handler to be set
<> 144:ef7eb2e8f9f7 106 */
AnnaBridge 167:e84263d55307 107 void ticker_set_handler(const ticker_data_t *const ticker, ticker_event_handler handler);
<> 144:ef7eb2e8f9f7 108
<> 144:ef7eb2e8f9f7 109 /** IRQ handler that goes through the events to trigger overdue events.
<> 144:ef7eb2e8f9f7 110 *
AnnaBridge 167:e84263d55307 111 * @param ticker The ticker object.
<> 144:ef7eb2e8f9f7 112 */
AnnaBridge 167:e84263d55307 113 void ticker_irq_handler(const ticker_data_t *const ticker);
<> 144:ef7eb2e8f9f7 114
<> 144:ef7eb2e8f9f7 115 /** Remove an event from the queue
<> 144:ef7eb2e8f9f7 116 *
AnnaBridge 167:e84263d55307 117 * @param ticker The ticker object.
<> 144:ef7eb2e8f9f7 118 * @param obj The event object to be removed from the queue
<> 144:ef7eb2e8f9f7 119 */
AnnaBridge 167:e84263d55307 120 void ticker_remove_event(const ticker_data_t *const ticker, ticker_event_t *obj);
<> 144:ef7eb2e8f9f7 121
<> 144:ef7eb2e8f9f7 122 /** Insert an event to the queue
<> 144:ef7eb2e8f9f7 123 *
AnnaBridge 167:e84263d55307 124 * The event will be executed in timestamp - ticker_read().
AnnaBridge 167:e84263d55307 125 *
AnnaBridge 167:e84263d55307 126 * @warning This function does not consider timestamp in the past. If an event
AnnaBridge 167:e84263d55307 127 * is inserted with a timestamp less than the current timestamp then the event
AnnaBridge 167:e84263d55307 128 * will be executed in timestamp - ticker_read() us.
AnnaBridge 167:e84263d55307 129 * The internal counter wrap very quickly it is hard to decide weither an
AnnaBridge 167:e84263d55307 130 * event is in the past or in 1 hour.
AnnaBridge 167:e84263d55307 131 *
AnnaBridge 167:e84263d55307 132 * @note prefer the use of ticker_insert_event_us which allows registration of
AnnaBridge 167:e84263d55307 133 * absolute timestamp.
AnnaBridge 167:e84263d55307 134 *
AnnaBridge 167:e84263d55307 135 * @param ticker The ticker object.
<> 144:ef7eb2e8f9f7 136 * @param obj The event object to be inserted to the queue
<> 144:ef7eb2e8f9f7 137 * @param timestamp The event's timestamp
<> 144:ef7eb2e8f9f7 138 * @param id The event object
<> 144:ef7eb2e8f9f7 139 */
AnnaBridge 167:e84263d55307 140 void ticker_insert_event(const ticker_data_t *const ticker, ticker_event_t *obj, timestamp_t timestamp, uint32_t id);
<> 144:ef7eb2e8f9f7 141
AnnaBridge 167:e84263d55307 142 /** Insert an event to the queue
AnnaBridge 167:e84263d55307 143 *
AnnaBridge 167:e84263d55307 144 * The event will be executed in timestamp - ticker_read_us() us.
AnnaBridge 167:e84263d55307 145 *
AnnaBridge 176:447f873cad2f 146 * @note If an event is inserted with a timestamp less than the current
AnnaBridge 176:447f873cad2f 147 * timestamp then the event will be scheduled immediately resulting in
AnnaBridge 176:447f873cad2f 148 * an instant call to event handler.
<> 144:ef7eb2e8f9f7 149 *
AnnaBridge 167:e84263d55307 150 * @param ticker The ticker object.
AnnaBridge 167:e84263d55307 151 * @param obj The event object to be inserted to the queue
AnnaBridge 167:e84263d55307 152 * @param timestamp The event's timestamp
AnnaBridge 167:e84263d55307 153 * @param id The event object
AnnaBridge 167:e84263d55307 154 */
AnnaBridge 167:e84263d55307 155 void ticker_insert_event_us(const ticker_data_t *const ticker, ticker_event_t *obj, us_timestamp_t timestamp, uint32_t id);
AnnaBridge 167:e84263d55307 156
AnnaBridge 167:e84263d55307 157 /** Read the current (relative) ticker's timestamp
AnnaBridge 167:e84263d55307 158 *
AnnaBridge 167:e84263d55307 159 * @warning Return a relative timestamp because the counter wrap every 4294
AnnaBridge 167:e84263d55307 160 * seconds.
AnnaBridge 167:e84263d55307 161 *
AnnaBridge 167:e84263d55307 162 * @param ticker The ticker object.
<> 144:ef7eb2e8f9f7 163 * @return The current timestamp
<> 144:ef7eb2e8f9f7 164 */
AnnaBridge 167:e84263d55307 165 timestamp_t ticker_read(const ticker_data_t *const ticker);
AnnaBridge 167:e84263d55307 166
AnnaBridge 167:e84263d55307 167 /** Read the current (absolute) ticker's timestamp
AnnaBridge 167:e84263d55307 168 *
AnnaBridge 167:e84263d55307 169 * @warning Return an absolute timestamp counting from the initialization of the
AnnaBridge 167:e84263d55307 170 * ticker.
AnnaBridge 167:e84263d55307 171 *
AnnaBridge 167:e84263d55307 172 * @param ticker The ticker object.
AnnaBridge 167:e84263d55307 173 * @return The current timestamp
AnnaBridge 167:e84263d55307 174 */
AnnaBridge 167:e84263d55307 175 us_timestamp_t ticker_read_us(const ticker_data_t *const ticker);
<> 144:ef7eb2e8f9f7 176
<> 144:ef7eb2e8f9f7 177 /** Read the next event's timestamp
<> 144:ef7eb2e8f9f7 178 *
AnnaBridge 167:e84263d55307 179 * @param ticker The ticker object.
AnnaBridge 167:e84263d55307 180 * @param timestamp The timestamp object.
<> 144:ef7eb2e8f9f7 181 * @return 1 if timestamp is pending event, 0 if there's no event pending
<> 144:ef7eb2e8f9f7 182 */
AnnaBridge 167:e84263d55307 183 int ticker_get_next_timestamp(const ticker_data_t *const ticker, timestamp_t *timestamp);
<> 144:ef7eb2e8f9f7 184
Anna Bridge 180:96ed750bd169 185 /* Private functions
Anna Bridge 180:96ed750bd169 186 *
Anna Bridge 180:96ed750bd169 187 * @cond PRIVATE
Anna Bridge 180:96ed750bd169 188 *
Anna Bridge 180:96ed750bd169 189 */
Anna Bridge 180:96ed750bd169 190
Anna Bridge 180:96ed750bd169 191 int _ticker_match_interval_passed(timestamp_t prev_tick, timestamp_t cur_tick, timestamp_t match_tick);
Anna Bridge 180:96ed750bd169 192
Anna Bridge 180:96ed750bd169 193 /*
Anna Bridge 180:96ed750bd169 194 * @endcond PRIVATE
Anna Bridge 180:96ed750bd169 195 *
Anna Bridge 180:96ed750bd169 196 */
Anna Bridge 180:96ed750bd169 197
<> 144:ef7eb2e8f9f7 198 /**@}*/
<> 144:ef7eb2e8f9f7 199
<> 144:ef7eb2e8f9f7 200 #ifdef __cplusplus
<> 144:ef7eb2e8f9f7 201 }
<> 144:ef7eb2e8f9f7 202 #endif
<> 144:ef7eb2e8f9f7 203
<> 144:ef7eb2e8f9f7 204 #endif
<> 149:156823d33999 205
<> 149:156823d33999 206 /** @}*/