PHung Tung / DISCO-F746_WAV_PLAYER

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Dependencies:   F746_GUI SD_PlayerSkeleton F746_SAI_IO

SRC_STM32F7/common/ticker_api.c@0:8ede47d38d10, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:37:21 2019 +0000
Revision:
0:8ede47d38d10
SPKT

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phungductung 0:8ede47d38d10 1 /* mbed Microcontroller Library
phungductung 0:8ede47d38d10 2 * Copyright (c) 2015 ARM Limited
phungductung 0:8ede47d38d10 3 *
phungductung 0:8ede47d38d10 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:8ede47d38d10 5 * you may not use this file except in compliance with the License.
phungductung 0:8ede47d38d10 6 * You may obtain a copy of the License at
phungductung 0:8ede47d38d10 7 *
phungductung 0:8ede47d38d10 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:8ede47d38d10 9 *
phungductung 0:8ede47d38d10 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:8ede47d38d10 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:8ede47d38d10 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:8ede47d38d10 13 * See the License for the specific language governing permissions and
phungductung 0:8ede47d38d10 14 * limitations under the License.
phungductung 0:8ede47d38d10 15 */
phungductung 0:8ede47d38d10 16 #include <stddef.h>
phungductung 0:8ede47d38d10 17 #include "ticker_api.h"
phungductung 0:8ede47d38d10 18 #include "cmsis.h"
phungductung 0:8ede47d38d10 19
phungductung 0:8ede47d38d10 20 void ticker_set_handler(const ticker_data_t *const data, ticker_event_handler handler) {
phungductung 0:8ede47d38d10 21 data->interface->init();
phungductung 0:8ede47d38d10 22
phungductung 0:8ede47d38d10 23 data->queue->event_handler = handler;
phungductung 0:8ede47d38d10 24 }
phungductung 0:8ede47d38d10 25
phungductung 0:8ede47d38d10 26 void ticker_irq_handler(const ticker_data_t *const data) {
phungductung 0:8ede47d38d10 27 data->interface->clear_interrupt();
phungductung 0:8ede47d38d10 28
phungductung 0:8ede47d38d10 29 /* Go through all the pending TimerEvents */
phungductung 0:8ede47d38d10 30 while (1) {
phungductung 0:8ede47d38d10 31 if (data->queue->head == NULL) {
phungductung 0:8ede47d38d10 32 // There are no more TimerEvents left, so disable matches.
phungductung 0:8ede47d38d10 33 data->interface->disable_interrupt();
phungductung 0:8ede47d38d10 34 return;
phungductung 0:8ede47d38d10 35 }
phungductung 0:8ede47d38d10 36
phungductung 0:8ede47d38d10 37 if ((int)(data->queue->head->timestamp - data->interface->read()) <= 0) {
phungductung 0:8ede47d38d10 38 // This event was in the past:
phungductung 0:8ede47d38d10 39 // point to the following one and execute its handler
phungductung 0:8ede47d38d10 40 ticker_event_t *p = data->queue->head;
phungductung 0:8ede47d38d10 41 data->queue->head = data->queue->head->next;
phungductung 0:8ede47d38d10 42 if (data->queue->event_handler != NULL) {
phungductung 0:8ede47d38d10 43 (*data->queue->event_handler)(p->id); // NOTE: the handler can set new events
phungductung 0:8ede47d38d10 44 }
phungductung 0:8ede47d38d10 45 /* Note: We continue back to examining the head because calling the
phungductung 0:8ede47d38d10 46 * event handler may have altered the chain of pending events. */
phungductung 0:8ede47d38d10 47 } else {
phungductung 0:8ede47d38d10 48 // This event and the following ones in the list are in the future:
phungductung 0:8ede47d38d10 49 // set it as next interrupt and return
phungductung 0:8ede47d38d10 50 data->interface->set_interrupt(data->queue->head->timestamp);
phungductung 0:8ede47d38d10 51 return;
phungductung 0:8ede47d38d10 52 }
phungductung 0:8ede47d38d10 53 }
phungductung 0:8ede47d38d10 54 }
phungductung 0:8ede47d38d10 55
phungductung 0:8ede47d38d10 56 void ticker_insert_event(const ticker_data_t *const data, ticker_event_t *obj, timestamp_t timestamp, uint32_t id) {
phungductung 0:8ede47d38d10 57 /* disable interrupts for the duration of the function */
phungductung 0:8ede47d38d10 58 __disable_irq();
phungductung 0:8ede47d38d10 59
phungductung 0:8ede47d38d10 60 // initialise our data
phungductung 0:8ede47d38d10 61 obj->timestamp = timestamp;
phungductung 0:8ede47d38d10 62 obj->id = id;
phungductung 0:8ede47d38d10 63
phungductung 0:8ede47d38d10 64 /* Go through the list until we either reach the end, or find
phungductung 0:8ede47d38d10 65 an element this should come before (which is possibly the
phungductung 0:8ede47d38d10 66 head). */
phungductung 0:8ede47d38d10 67 ticker_event_t *prev = NULL, *p = data->queue->head;
phungductung 0:8ede47d38d10 68 while (p != NULL) {
phungductung 0:8ede47d38d10 69 /* check if we come before p */
phungductung 0:8ede47d38d10 70 if ((int)(timestamp - p->timestamp) < 0) {
phungductung 0:8ede47d38d10 71 break;
phungductung 0:8ede47d38d10 72 }
phungductung 0:8ede47d38d10 73 /* go to the next element */
phungductung 0:8ede47d38d10 74 prev = p;
phungductung 0:8ede47d38d10 75 p = p->next;
phungductung 0:8ede47d38d10 76 }
phungductung 0:8ede47d38d10 77 /* if prev is NULL we're at the head */
phungductung 0:8ede47d38d10 78 if (prev == NULL) {
phungductung 0:8ede47d38d10 79 data->queue->head = obj;
phungductung 0:8ede47d38d10 80 data->interface->set_interrupt(timestamp);
phungductung 0:8ede47d38d10 81 } else {
phungductung 0:8ede47d38d10 82 prev->next = obj;
phungductung 0:8ede47d38d10 83 }
phungductung 0:8ede47d38d10 84 /* if we're at the end p will be NULL, which is correct */
phungductung 0:8ede47d38d10 85 obj->next = p;
phungductung 0:8ede47d38d10 86
phungductung 0:8ede47d38d10 87 __enable_irq();
phungductung 0:8ede47d38d10 88 }
phungductung 0:8ede47d38d10 89
phungductung 0:8ede47d38d10 90 void ticker_remove_event(const ticker_data_t *const data, ticker_event_t *obj) {
phungductung 0:8ede47d38d10 91 __disable_irq();
phungductung 0:8ede47d38d10 92
phungductung 0:8ede47d38d10 93 // remove this object from the list
phungductung 0:8ede47d38d10 94 if (data->queue->head == obj) {
phungductung 0:8ede47d38d10 95 // first in the list, so just drop me
phungductung 0:8ede47d38d10 96 data->queue->head = obj->next;
phungductung 0:8ede47d38d10 97 if (data->queue->head == NULL) {
phungductung 0:8ede47d38d10 98 data->interface->disable_interrupt();
phungductung 0:8ede47d38d10 99 } else {
phungductung 0:8ede47d38d10 100 data->interface->set_interrupt(data->queue->head->timestamp);
phungductung 0:8ede47d38d10 101 }
phungductung 0:8ede47d38d10 102 } else {
phungductung 0:8ede47d38d10 103 // find the object before me, then drop me
phungductung 0:8ede47d38d10 104 ticker_event_t* p = data->queue->head;
phungductung 0:8ede47d38d10 105 while (p != NULL) {
phungductung 0:8ede47d38d10 106 if (p->next == obj) {
phungductung 0:8ede47d38d10 107 p->next = obj->next;
phungductung 0:8ede47d38d10 108 break;
phungductung 0:8ede47d38d10 109 }
phungductung 0:8ede47d38d10 110 p = p->next;
phungductung 0:8ede47d38d10 111 }
phungductung 0:8ede47d38d10 112 }
phungductung 0:8ede47d38d10 113
phungductung 0:8ede47d38d10 114 __enable_irq();
phungductung 0:8ede47d38d10 115 }
phungductung 0:8ede47d38d10 116
phungductung 0:8ede47d38d10 117 timestamp_t ticker_read(const ticker_data_t *const data)
phungductung 0:8ede47d38d10 118 {
phungductung 0:8ede47d38d10 119 return data->interface->read();
phungductung 0:8ede47d38d10 120 }
phungductung 0:8ede47d38d10 121
phungductung 0:8ede47d38d10 122 int ticker_get_next_timestamp(const ticker_data_t *const data, timestamp_t *timestamp)
phungductung 0:8ede47d38d10 123 {
phungductung 0:8ede47d38d10 124 int ret = 0;
phungductung 0:8ede47d38d10 125
phungductung 0:8ede47d38d10 126 /* if head is NULL, there are no pending events */
phungductung 0:8ede47d38d10 127 __disable_irq();
phungductung 0:8ede47d38d10 128 if (data->queue->head != NULL) {
phungductung 0:8ede47d38d10 129 *timestamp = data->queue->head->timestamp;
phungductung 0:8ede47d38d10 130 ret = 1;
phungductung 0:8ede47d38d10 131 }
phungductung 0:8ede47d38d10 132 __enable_irq();
phungductung 0:8ede47d38d10 133
phungductung 0:8ede47d38d10 134 return ret;
phungductung 0:8ede47d38d10 135 }