Amit Gandhi / mbed-dev_2

t

Fork of mbed-dev by mbed official

hal/ticker_api.h@178:d650f5d4c87a, 2017-11-08 (annotated)

Committer:
AnnaBridge
Date:
Wed Nov 08 13:50:44 2017 +0000
Revision:
178:d650f5d4c87a
Parent:
177:447f873cad2f 
This updates the lib to the mbed lib v 155

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 168:e84263d55307 23 #include <stdbool.h>
<> 144:ef7eb2e8f9f7 24 #include "device.h"
<> 144:ef7eb2e8f9f7 25
AnnaBridge 168:e84263d55307 26 /**
AnnaBridge 168:e84263d55307 27 * Maximum delta (in us) between too interrupts.
AnnaBridge 168:e84263d55307 28 */
AnnaBridge 168:e84263d55307 29 #define MBED_TICKER_INTERRUPT_TIMESTAMP_MAX_DELTA 0x70000000ULL
AnnaBridge 168:e84263d55307 30
AnnaBridge 168:e84263d55307 31 /**
AnnaBridge 168:e84263d55307 32 * Legacy format representing a timestamp in us.
AnnaBridge 168:e84263d55307 33 * Given it is modeled as a 32 bit integer, this type can represent timestamp
AnnaBridge 168:e84263d55307 34 * up to 4294 seconds (71 minutes).
AnnaBridge 168:e84263d55307 35 * Prefer using us_timestamp_t which store timestamp as 64 bits integer.
AnnaBridge 168:e84263d55307 36 */
<> 144:ef7eb2e8f9f7 37 typedef uint32_t timestamp_t;
<> 144:ef7eb2e8f9f7 38
AnnaBridge 168:e84263d55307 39 /**
AnnaBridge 168:e84263d55307 40 * A us timestamp stored in a 64 bit integer.
AnnaBridge 168:e84263d55307 41 * Can store timestamp up to 584810 years.
AnnaBridge 168:e84263d55307 42 */
AnnaBridge 168:e84263d55307 43 typedef uint64_t us_timestamp_t;
AnnaBridge 168:e84263d55307 44
<> 144:ef7eb2e8f9f7 45 /** Ticker's event structure
<> 144:ef7eb2e8f9f7 46 */
<> 144:ef7eb2e8f9f7 47 typedef struct ticker_event_s {
AnnaBridge 168:e84263d55307 48 us_timestamp_t timestamp; /**< Event's timestamp */
<> 144:ef7eb2e8f9f7 49 uint32_t id; /**< TimerEvent object */
<> 144:ef7eb2e8f9f7 50 struct ticker_event_s *next; /**< Next event in the queue */
<> 144:ef7eb2e8f9f7 51 } ticker_event_t;
<> 144:ef7eb2e8f9f7 52
<> 144:ef7eb2e8f9f7 53 typedef void (*ticker_event_handler)(uint32_t id);
<> 144:ef7eb2e8f9f7 54
<> 144:ef7eb2e8f9f7 55 /** Ticker's interface structure - required API for a ticker
<> 144:ef7eb2e8f9f7 56 */
<> 144:ef7eb2e8f9f7 57 typedef struct {
<> 144:ef7eb2e8f9f7 58 void (*init)(void); /**< Init function */
<> 144:ef7eb2e8f9f7 59 uint32_t (*read)(void); /**< Read function */
<> 144:ef7eb2e8f9f7 60 void (*disable_interrupt)(void); /**< Disable interrupt function */
<> 144:ef7eb2e8f9f7 61 void (*clear_interrupt)(void); /**< Clear interrupt function */
<> 144:ef7eb2e8f9f7 62 void (*set_interrupt)(timestamp_t timestamp); /**< Set interrupt function */
AnnaBridge 175:b96e65c34a4d 63 void (*fire_interrupt)(void); /**< Fire interrupt right-away */
<> 144:ef7eb2e8f9f7 64 } ticker_interface_t;
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 /** Ticker's event queue structure
<> 144:ef7eb2e8f9f7 67 */
<> 144:ef7eb2e8f9f7 68 typedef struct {
<> 144:ef7eb2e8f9f7 69 ticker_event_handler event_handler; /**< Event handler */
<> 144:ef7eb2e8f9f7 70 ticker_event_t *head; /**< A pointer to head */
AnnaBridge 168:e84263d55307 71 us_timestamp_t present_time; /**< Store the timestamp used for present time */
AnnaBridge 168:e84263d55307 72 bool initialized; /**< Indicate if the instance is initialized */
<> 144:ef7eb2e8f9f7 73 } ticker_event_queue_t;
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 /** Ticker's data structure
<> 144:ef7eb2e8f9f7 76 */
<> 144:ef7eb2e8f9f7 77 typedef struct {
<> 144:ef7eb2e8f9f7 78 const ticker_interface_t *interface; /**< Ticker's interface */
<> 144:ef7eb2e8f9f7 79 ticker_event_queue_t *queue; /**< Ticker's event queue */
<> 144:ef7eb2e8f9f7 80 } ticker_data_t;
<> 144:ef7eb2e8f9f7 81
<> 144:ef7eb2e8f9f7 82 #ifdef __cplusplus
<> 144:ef7eb2e8f9f7 83 extern "C" {
<> 144:ef7eb2e8f9f7 84 #endif
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 /**
<> 144:ef7eb2e8f9f7 87 * \defgroup hal_ticker Ticker HAL functions
<> 144:ef7eb2e8f9f7 88 * @{
<> 144:ef7eb2e8f9f7 89 */
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 /** Initialize a ticker and set the event handler
<> 144:ef7eb2e8f9f7 92 *
AnnaBridge 168:e84263d55307 93 * @param ticker The ticker object.
<> 144:ef7eb2e8f9f7 94 * @param handler A handler to be set
<> 144:ef7eb2e8f9f7 95 */
AnnaBridge 168:e84263d55307 96 void ticker_set_handler(const ticker_data_t *const ticker, ticker_event_handler handler);
<> 144:ef7eb2e8f9f7 97
<> 144:ef7eb2e8f9f7 98 /** IRQ handler that goes through the events to trigger overdue events.
<> 144:ef7eb2e8f9f7 99 *
AnnaBridge 168:e84263d55307 100 * @param ticker The ticker object.
<> 144:ef7eb2e8f9f7 101 */
AnnaBridge 168:e84263d55307 102 void ticker_irq_handler(const ticker_data_t *const ticker);
<> 144:ef7eb2e8f9f7 103
<> 144:ef7eb2e8f9f7 104 /** Remove an event from the queue
<> 144:ef7eb2e8f9f7 105 *
AnnaBridge 168:e84263d55307 106 * @param ticker The ticker object.
<> 144:ef7eb2e8f9f7 107 * @param obj The event object to be removed from the queue
<> 144:ef7eb2e8f9f7 108 */
AnnaBridge 168:e84263d55307 109 void ticker_remove_event(const ticker_data_t *const ticker, ticker_event_t *obj);
<> 144:ef7eb2e8f9f7 110
<> 144:ef7eb2e8f9f7 111 /** Insert an event to the queue
<> 144:ef7eb2e8f9f7 112 *
AnnaBridge 168:e84263d55307 113 * The event will be executed in timestamp - ticker_read().
AnnaBridge 168:e84263d55307 114 *
AnnaBridge 168:e84263d55307 115 * @warning This function does not consider timestamp in the past. If an event
AnnaBridge 168:e84263d55307 116 * is inserted with a timestamp less than the current timestamp then the event
AnnaBridge 168:e84263d55307 117 * will be executed in timestamp - ticker_read() us.
AnnaBridge 168:e84263d55307 118 * The internal counter wrap very quickly it is hard to decide weither an
AnnaBridge 168:e84263d55307 119 * event is in the past or in 1 hour.
AnnaBridge 168:e84263d55307 120 *
AnnaBridge 168:e84263d55307 121 * @note prefer the use of ticker_insert_event_us which allows registration of
AnnaBridge 168:e84263d55307 122 * absolute timestamp.
AnnaBridge 168:e84263d55307 123 *
AnnaBridge 168:e84263d55307 124 * @param ticker The ticker object.
<> 144:ef7eb2e8f9f7 125 * @param obj The event object to be inserted to the queue
<> 144:ef7eb2e8f9f7 126 * @param timestamp The event's timestamp
<> 144:ef7eb2e8f9f7 127 * @param id The event object
<> 144:ef7eb2e8f9f7 128 */
AnnaBridge 168:e84263d55307 129 void ticker_insert_event(const ticker_data_t *const ticker, ticker_event_t *obj, timestamp_t timestamp, uint32_t id);
<> 144:ef7eb2e8f9f7 130
AnnaBridge 168:e84263d55307 131 /** Insert an event to the queue
AnnaBridge 168:e84263d55307 132 *
AnnaBridge 168:e84263d55307 133 * The event will be executed in timestamp - ticker_read_us() us.
AnnaBridge 168:e84263d55307 134 *
AnnaBridge 177:447f873cad2f 135 * @note If an event is inserted with a timestamp less than the current
AnnaBridge 177:447f873cad2f 136 * timestamp then the event will be scheduled immediately resulting in
AnnaBridge 177:447f873cad2f 137 * an instant call to event handler.
<> 144:ef7eb2e8f9f7 138 *
AnnaBridge 168:e84263d55307 139 * @param ticker The ticker object.
AnnaBridge 168:e84263d55307 140 * @param obj The event object to be inserted to the queue
AnnaBridge 168:e84263d55307 141 * @param timestamp The event's timestamp
AnnaBridge 168:e84263d55307 142 * @param id The event object
AnnaBridge 168:e84263d55307 143 */
AnnaBridge 168:e84263d55307 144 void ticker_insert_event_us(const ticker_data_t *const ticker, ticker_event_t *obj, us_timestamp_t timestamp, uint32_t id);
AnnaBridge 168:e84263d55307 145
AnnaBridge 168:e84263d55307 146 /** Read the current (relative) ticker's timestamp
AnnaBridge 168:e84263d55307 147 *
AnnaBridge 168:e84263d55307 148 * @warning Return a relative timestamp because the counter wrap every 4294
AnnaBridge 168:e84263d55307 149 * seconds.
AnnaBridge 168:e84263d55307 150 *
AnnaBridge 168:e84263d55307 151 * @param ticker The ticker object.
<> 144:ef7eb2e8f9f7 152 * @return The current timestamp
<> 144:ef7eb2e8f9f7 153 */
AnnaBridge 168:e84263d55307 154 timestamp_t ticker_read(const ticker_data_t *const ticker);
AnnaBridge 168:e84263d55307 155
AnnaBridge 168:e84263d55307 156 /** Read the current (absolute) ticker's timestamp
AnnaBridge 168:e84263d55307 157 *
AnnaBridge 168:e84263d55307 158 * @warning Return an absolute timestamp counting from the initialization of the
AnnaBridge 168:e84263d55307 159 * ticker.
AnnaBridge 168:e84263d55307 160 *
AnnaBridge 168:e84263d55307 161 * @param ticker The ticker object.
AnnaBridge 168:e84263d55307 162 * @return The current timestamp
AnnaBridge 168:e84263d55307 163 */
AnnaBridge 168:e84263d55307 164 us_timestamp_t ticker_read_us(const ticker_data_t *const ticker);
<> 144:ef7eb2e8f9f7 165
<> 144:ef7eb2e8f9f7 166 /** Read the next event's timestamp
<> 144:ef7eb2e8f9f7 167 *
AnnaBridge 168:e84263d55307 168 * @param ticker The ticker object.
AnnaBridge 168:e84263d55307 169 * @param timestamp The timestamp object.
<> 144:ef7eb2e8f9f7 170 * @return 1 if timestamp is pending event, 0 if there's no event pending
<> 144:ef7eb2e8f9f7 171 */
AnnaBridge 168:e84263d55307 172 int ticker_get_next_timestamp(const ticker_data_t *const ticker, timestamp_t *timestamp);
<> 144:ef7eb2e8f9f7 173
<> 144:ef7eb2e8f9f7 174 /**@}*/
<> 144:ef7eb2e8f9f7 175
<> 144:ef7eb2e8f9f7 176 #ifdef __cplusplus
<> 144:ef7eb2e8f9f7 177 }
<> 144:ef7eb2e8f9f7 178 #endif
<> 144:ef7eb2e8f9f7 179
<> 144:ef7eb2e8f9f7 180 #endif
<> 149:156823d33999 181
<> 149:156823d33999 182 /** @}*/