PHung Tung / WAV2

SPKT

Dependencies:   F746_GUI SD_PlayerSkeleton F746_SAI_IO

mbed_src_STM32F7/common/ticker_api.c@0:aa3fc5ad02f7, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 09:08:29 2019 +0000
Revision:
0:aa3fc5ad02f7
SPKT

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phungductung 0:aa3fc5ad02f7 1 /* mbed Microcontroller Library
phungductung 0:aa3fc5ad02f7 2 * Copyright (c) 2015 ARM Limited
phungductung 0:aa3fc5ad02f7 3 *
phungductung 0:aa3fc5ad02f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:aa3fc5ad02f7 5 * you may not use this file except in compliance with the License.
phungductung 0:aa3fc5ad02f7 6 * You may obtain a copy of the License at
phungductung 0:aa3fc5ad02f7 7 *
phungductung 0:aa3fc5ad02f7 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:aa3fc5ad02f7 9 *
phungductung 0:aa3fc5ad02f7 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:aa3fc5ad02f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:aa3fc5ad02f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:aa3fc5ad02f7 13 * See the License for the specific language governing permissions and
phungductung 0:aa3fc5ad02f7 14 * limitations under the License.
phungductung 0:aa3fc5ad02f7 15 */
phungductung 0:aa3fc5ad02f7 16 #include <stddef.h>
phungductung 0:aa3fc5ad02f7 17 #include "ticker_api.h"
phungductung 0:aa3fc5ad02f7 18 #include "cmsis.h"
phungductung 0:aa3fc5ad02f7 19
phungductung 0:aa3fc5ad02f7 20 void ticker_set_handler(const ticker_data_t *const data, ticker_event_handler handler) {
phungductung 0:aa3fc5ad02f7 21 data->interface->init();
phungductung 0:aa3fc5ad02f7 22
phungductung 0:aa3fc5ad02f7 23 data->queue->event_handler = handler;
phungductung 0:aa3fc5ad02f7 24 }
phungductung 0:aa3fc5ad02f7 25
phungductung 0:aa3fc5ad02f7 26 void ticker_irq_handler(const ticker_data_t *const data) {
phungductung 0:aa3fc5ad02f7 27 data->interface->clear_interrupt();
phungductung 0:aa3fc5ad02f7 28
phungductung 0:aa3fc5ad02f7 29 /* Go through all the pending TimerEvents */
phungductung 0:aa3fc5ad02f7 30 while (1) {
phungductung 0:aa3fc5ad02f7 31 if (data->queue->head == NULL) {
phungductung 0:aa3fc5ad02f7 32 // There are no more TimerEvents left, so disable matches.
phungductung 0:aa3fc5ad02f7 33 data->interface->disable_interrupt();
phungductung 0:aa3fc5ad02f7 34 return;
phungductung 0:aa3fc5ad02f7 35 }
phungductung 0:aa3fc5ad02f7 36
phungductung 0:aa3fc5ad02f7 37 if ((int)(data->queue->head->timestamp - data->interface->read()) <= 0) {
phungductung 0:aa3fc5ad02f7 38 // This event was in the past:
phungductung 0:aa3fc5ad02f7 39 // point to the following one and execute its handler
phungductung 0:aa3fc5ad02f7 40 ticker_event_t *p = data->queue->head;
phungductung 0:aa3fc5ad02f7 41 data->queue->head = data->queue->head->next;
phungductung 0:aa3fc5ad02f7 42 if (data->queue->event_handler != NULL) {
phungductung 0:aa3fc5ad02f7 43 (*data->queue->event_handler)(p->id); // NOTE: the handler can set new events
phungductung 0:aa3fc5ad02f7 44 }
phungductung 0:aa3fc5ad02f7 45 /* Note: We continue back to examining the head because calling the
phungductung 0:aa3fc5ad02f7 46 * event handler may have altered the chain of pending events. */
phungductung 0:aa3fc5ad02f7 47 } else {
phungductung 0:aa3fc5ad02f7 48 // This event and the following ones in the list are in the future:
phungductung 0:aa3fc5ad02f7 49 // set it as next interrupt and return
phungductung 0:aa3fc5ad02f7 50 data->interface->set_interrupt(data->queue->head->timestamp);
phungductung 0:aa3fc5ad02f7 51 return;
phungductung 0:aa3fc5ad02f7 52 }
phungductung 0:aa3fc5ad02f7 53 }
phungductung 0:aa3fc5ad02f7 54 }
phungductung 0:aa3fc5ad02f7 55
phungductung 0:aa3fc5ad02f7 56 void ticker_insert_event(const ticker_data_t *const data, ticker_event_t *obj, timestamp_t timestamp, uint32_t id) {
phungductung 0:aa3fc5ad02f7 57 /* disable interrupts for the duration of the function */
phungductung 0:aa3fc5ad02f7 58 __disable_irq();
phungductung 0:aa3fc5ad02f7 59
phungductung 0:aa3fc5ad02f7 60 // initialise our data
phungductung 0:aa3fc5ad02f7 61 obj->timestamp = timestamp;
phungductung 0:aa3fc5ad02f7 62 obj->id = id;
phungductung 0:aa3fc5ad02f7 63
phungductung 0:aa3fc5ad02f7 64 /* Go through the list until we either reach the end, or find
phungductung 0:aa3fc5ad02f7 65 an element this should come before (which is possibly the
phungductung 0:aa3fc5ad02f7 66 head). */
phungductung 0:aa3fc5ad02f7 67 ticker_event_t *prev = NULL, *p = data->queue->head;
phungductung 0:aa3fc5ad02f7 68 while (p != NULL) {
phungductung 0:aa3fc5ad02f7 69 /* check if we come before p */
phungductung 0:aa3fc5ad02f7 70 if ((int)(timestamp - p->timestamp) < 0) {
phungductung 0:aa3fc5ad02f7 71 break;
phungductung 0:aa3fc5ad02f7 72 }
phungductung 0:aa3fc5ad02f7 73 /* go to the next element */
phungductung 0:aa3fc5ad02f7 74 prev = p;
phungductung 0:aa3fc5ad02f7 75 p = p->next;
phungductung 0:aa3fc5ad02f7 76 }
phungductung 0:aa3fc5ad02f7 77 /* if prev is NULL we're at the head */
phungductung 0:aa3fc5ad02f7 78 if (prev == NULL) {
phungductung 0:aa3fc5ad02f7 79 data->queue->head = obj;
phungductung 0:aa3fc5ad02f7 80 data->interface->set_interrupt(timestamp);
phungductung 0:aa3fc5ad02f7 81 } else {
phungductung 0:aa3fc5ad02f7 82 prev->next = obj;
phungductung 0:aa3fc5ad02f7 83 }
phungductung 0:aa3fc5ad02f7 84 /* if we're at the end p will be NULL, which is correct */
phungductung 0:aa3fc5ad02f7 85 obj->next = p;
phungductung 0:aa3fc5ad02f7 86
phungductung 0:aa3fc5ad02f7 87 __enable_irq();
phungductung 0:aa3fc5ad02f7 88 }
phungductung 0:aa3fc5ad02f7 89
phungductung 0:aa3fc5ad02f7 90 void ticker_remove_event(const ticker_data_t *const data, ticker_event_t *obj) {
phungductung 0:aa3fc5ad02f7 91 __disable_irq();
phungductung 0:aa3fc5ad02f7 92
phungductung 0:aa3fc5ad02f7 93 // remove this object from the list
phungductung 0:aa3fc5ad02f7 94 if (data->queue->head == obj) {
phungductung 0:aa3fc5ad02f7 95 // first in the list, so just drop me
phungductung 0:aa3fc5ad02f7 96 data->queue->head = obj->next;
phungductung 0:aa3fc5ad02f7 97 if (data->queue->head == NULL) {
phungductung 0:aa3fc5ad02f7 98 data->interface->disable_interrupt();
phungductung 0:aa3fc5ad02f7 99 } else {
phungductung 0:aa3fc5ad02f7 100 data->interface->set_interrupt(data->queue->head->timestamp);
phungductung 0:aa3fc5ad02f7 101 }
phungductung 0:aa3fc5ad02f7 102 } else {
phungductung 0:aa3fc5ad02f7 103 // find the object before me, then drop me
phungductung 0:aa3fc5ad02f7 104 ticker_event_t* p = data->queue->head;
phungductung 0:aa3fc5ad02f7 105 while (p != NULL) {
phungductung 0:aa3fc5ad02f7 106 if (p->next == obj) {
phungductung 0:aa3fc5ad02f7 107 p->next = obj->next;
phungductung 0:aa3fc5ad02f7 108 break;
phungductung 0:aa3fc5ad02f7 109 }
phungductung 0:aa3fc5ad02f7 110 p = p->next;
phungductung 0:aa3fc5ad02f7 111 }
phungductung 0:aa3fc5ad02f7 112 }
phungductung 0:aa3fc5ad02f7 113
phungductung 0:aa3fc5ad02f7 114 __enable_irq();
phungductung 0:aa3fc5ad02f7 115 }
phungductung 0:aa3fc5ad02f7 116
phungductung 0:aa3fc5ad02f7 117 timestamp_t ticker_read(const ticker_data_t *const data)
phungductung 0:aa3fc5ad02f7 118 {
phungductung 0:aa3fc5ad02f7 119 return data->interface->read();
phungductung 0:aa3fc5ad02f7 120 }
phungductung 0:aa3fc5ad02f7 121
phungductung 0:aa3fc5ad02f7 122 int ticker_get_next_timestamp(const ticker_data_t *const data, timestamp_t *timestamp)
phungductung 0:aa3fc5ad02f7 123 {
phungductung 0:aa3fc5ad02f7 124 int ret = 0;
phungductung 0:aa3fc5ad02f7 125
phungductung 0:aa3fc5ad02f7 126 /* if head is NULL, there are no pending events */
phungductung 0:aa3fc5ad02f7 127 __disable_irq();
phungductung 0:aa3fc5ad02f7 128 if (data->queue->head != NULL) {
phungductung 0:aa3fc5ad02f7 129 *timestamp = data->queue->head->timestamp;
phungductung 0:aa3fc5ad02f7 130 ret = 1;
phungductung 0:aa3fc5ad02f7 131 }
phungductung 0:aa3fc5ad02f7 132 __enable_irq();
phungductung 0:aa3fc5ad02f7 133
phungductung 0:aa3fc5ad02f7 134 return ret;
phungductung 0:aa3fc5ad02f7 135 }