不韋 呂 / F746_SD_Player_Demo

Demo program for library named SD_PlayerSkeleton of SD card player skeleton. SD カードプレーヤのための骨組みとして使うためのライブラリ SD_PlayerSkeleton の使用例．このプログラムについては，CQ出版社インターフェース誌 2018年7月号で解説している．

Dependencies:   F746_GUI F746_SAI_IO SD_PlayerSkeleton

mbed_src_STM32F7/common/ticker_api.c@19:3c3833ec00d2, 2017-04-09 (annotated)

Committer:
MikamiUitOpen
Date:
Sun Apr 09 12:44:17 2017 +0000
Revision:
19:3c3833ec00d2
Parent:
2:cf42e62a97dc 
20

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 2:cf42e62a97dc 1 /* mbed Microcontroller Library
MikamiUitOpen 2:cf42e62a97dc 2 * Copyright (c) 2015 ARM Limited
MikamiUitOpen 2:cf42e62a97dc 3 *
MikamiUitOpen 2:cf42e62a97dc 4 * Licensed under the Apache License, Version 2.0 (the "License");
MikamiUitOpen 2:cf42e62a97dc 5 * you may not use this file except in compliance with the License.
MikamiUitOpen 2:cf42e62a97dc 6 * You may obtain a copy of the License at
MikamiUitOpen 2:cf42e62a97dc 7 *
MikamiUitOpen 2:cf42e62a97dc 8 * http://www.apache.org/licenses/LICENSE-2.0
MikamiUitOpen 2:cf42e62a97dc 9 *
MikamiUitOpen 2:cf42e62a97dc 10 * Unless required by applicable law or agreed to in writing, software
MikamiUitOpen 2:cf42e62a97dc 11 * distributed under the License is distributed on an "AS IS" BASIS,
MikamiUitOpen 2:cf42e62a97dc 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MikamiUitOpen 2:cf42e62a97dc 13 * See the License for the specific language governing permissions and
MikamiUitOpen 2:cf42e62a97dc 14 * limitations under the License.
MikamiUitOpen 2:cf42e62a97dc 15 */
MikamiUitOpen 2:cf42e62a97dc 16 #include <stddef.h>
MikamiUitOpen 2:cf42e62a97dc 17 #include "ticker_api.h"
MikamiUitOpen 2:cf42e62a97dc 18 #include "cmsis.h"
MikamiUitOpen 2:cf42e62a97dc 19
MikamiUitOpen 2:cf42e62a97dc 20 void ticker_set_handler(const ticker_data_t *const data, ticker_event_handler handler) {
MikamiUitOpen 2:cf42e62a97dc 21 data->interface->init();
MikamiUitOpen 2:cf42e62a97dc 22
MikamiUitOpen 2:cf42e62a97dc 23 data->queue->event_handler = handler;
MikamiUitOpen 2:cf42e62a97dc 24 }
MikamiUitOpen 2:cf42e62a97dc 25
MikamiUitOpen 2:cf42e62a97dc 26 void ticker_irq_handler(const ticker_data_t *const data) {
MikamiUitOpen 2:cf42e62a97dc 27 data->interface->clear_interrupt();
MikamiUitOpen 2:cf42e62a97dc 28
MikamiUitOpen 2:cf42e62a97dc 29 /* Go through all the pending TimerEvents */
MikamiUitOpen 2:cf42e62a97dc 30 while (1) {
MikamiUitOpen 2:cf42e62a97dc 31 if (data->queue->head == NULL) {
MikamiUitOpen 2:cf42e62a97dc 32 // There are no more TimerEvents left, so disable matches.
MikamiUitOpen 2:cf42e62a97dc 33 data->interface->disable_interrupt();
MikamiUitOpen 2:cf42e62a97dc 34 return;
MikamiUitOpen 2:cf42e62a97dc 35 }
MikamiUitOpen 2:cf42e62a97dc 36
MikamiUitOpen 2:cf42e62a97dc 37 if ((int)(data->queue->head->timestamp - data->interface->read()) <= 0) {
MikamiUitOpen 2:cf42e62a97dc 38 // This event was in the past:
MikamiUitOpen 2:cf42e62a97dc 39 // point to the following one and execute its handler
MikamiUitOpen 2:cf42e62a97dc 40 ticker_event_t *p = data->queue->head;
MikamiUitOpen 2:cf42e62a97dc 41 data->queue->head = data->queue->head->next;
MikamiUitOpen 2:cf42e62a97dc 42 if (data->queue->event_handler != NULL) {
MikamiUitOpen 2:cf42e62a97dc 43 (*data->queue->event_handler)(p->id); // NOTE: the handler can set new events
MikamiUitOpen 2:cf42e62a97dc 44 }
MikamiUitOpen 2:cf42e62a97dc 45 /* Note: We continue back to examining the head because calling the
MikamiUitOpen 2:cf42e62a97dc 46 * event handler may have altered the chain of pending events. */
MikamiUitOpen 2:cf42e62a97dc 47 } else {
MikamiUitOpen 2:cf42e62a97dc 48 // This event and the following ones in the list are in the future:
MikamiUitOpen 2:cf42e62a97dc 49 // set it as next interrupt and return
MikamiUitOpen 2:cf42e62a97dc 50 data->interface->set_interrupt(data->queue->head->timestamp);
MikamiUitOpen 2:cf42e62a97dc 51 return;
MikamiUitOpen 2:cf42e62a97dc 52 }
MikamiUitOpen 2:cf42e62a97dc 53 }
MikamiUitOpen 2:cf42e62a97dc 54 }
MikamiUitOpen 2:cf42e62a97dc 55
MikamiUitOpen 2:cf42e62a97dc 56 void ticker_insert_event(const ticker_data_t *const data, ticker_event_t *obj, timestamp_t timestamp, uint32_t id) {
MikamiUitOpen 2:cf42e62a97dc 57 /* disable interrupts for the duration of the function */
MikamiUitOpen 2:cf42e62a97dc 58 __disable_irq();
MikamiUitOpen 2:cf42e62a97dc 59
MikamiUitOpen 2:cf42e62a97dc 60 // initialise our data
MikamiUitOpen 2:cf42e62a97dc 61 obj->timestamp = timestamp;
MikamiUitOpen 2:cf42e62a97dc 62 obj->id = id;
MikamiUitOpen 2:cf42e62a97dc 63
MikamiUitOpen 2:cf42e62a97dc 64 /* Go through the list until we either reach the end, or find
MikamiUitOpen 2:cf42e62a97dc 65 an element this should come before (which is possibly the
MikamiUitOpen 2:cf42e62a97dc 66 head). */
MikamiUitOpen 2:cf42e62a97dc 67 ticker_event_t *prev = NULL, *p = data->queue->head;
MikamiUitOpen 2:cf42e62a97dc 68 while (p != NULL) {
MikamiUitOpen 2:cf42e62a97dc 69 /* check if we come before p */
MikamiUitOpen 2:cf42e62a97dc 70 if ((int)(timestamp - p->timestamp) < 0) {
MikamiUitOpen 2:cf42e62a97dc 71 break;
MikamiUitOpen 2:cf42e62a97dc 72 }
MikamiUitOpen 2:cf42e62a97dc 73 /* go to the next element */
MikamiUitOpen 2:cf42e62a97dc 74 prev = p;
MikamiUitOpen 2:cf42e62a97dc 75 p = p->next;
MikamiUitOpen 2:cf42e62a97dc 76 }
MikamiUitOpen 2:cf42e62a97dc 77 /* if prev is NULL we're at the head */
MikamiUitOpen 2:cf42e62a97dc 78 if (prev == NULL) {
MikamiUitOpen 2:cf42e62a97dc 79 data->queue->head = obj;
MikamiUitOpen 2:cf42e62a97dc 80 data->interface->set_interrupt(timestamp);
MikamiUitOpen 2:cf42e62a97dc 81 } else {
MikamiUitOpen 2:cf42e62a97dc 82 prev->next = obj;
MikamiUitOpen 2:cf42e62a97dc 83 }
MikamiUitOpen 2:cf42e62a97dc 84 /* if we're at the end p will be NULL, which is correct */
MikamiUitOpen 2:cf42e62a97dc 85 obj->next = p;
MikamiUitOpen 2:cf42e62a97dc 86
MikamiUitOpen 2:cf42e62a97dc 87 __enable_irq();
MikamiUitOpen 2:cf42e62a97dc 88 }
MikamiUitOpen 2:cf42e62a97dc 89
MikamiUitOpen 2:cf42e62a97dc 90 void ticker_remove_event(const ticker_data_t *const data, ticker_event_t *obj) {
MikamiUitOpen 2:cf42e62a97dc 91 __disable_irq();
MikamiUitOpen 2:cf42e62a97dc 92
MikamiUitOpen 2:cf42e62a97dc 93 // remove this object from the list
MikamiUitOpen 2:cf42e62a97dc 94 if (data->queue->head == obj) {
MikamiUitOpen 2:cf42e62a97dc 95 // first in the list, so just drop me
MikamiUitOpen 2:cf42e62a97dc 96 data->queue->head = obj->next;
MikamiUitOpen 2:cf42e62a97dc 97 if (data->queue->head == NULL) {
MikamiUitOpen 2:cf42e62a97dc 98 data->interface->disable_interrupt();
MikamiUitOpen 2:cf42e62a97dc 99 } else {
MikamiUitOpen 2:cf42e62a97dc 100 data->interface->set_interrupt(data->queue->head->timestamp);
MikamiUitOpen 2:cf42e62a97dc 101 }
MikamiUitOpen 2:cf42e62a97dc 102 } else {
MikamiUitOpen 2:cf42e62a97dc 103 // find the object before me, then drop me
MikamiUitOpen 2:cf42e62a97dc 104 ticker_event_t* p = data->queue->head;
MikamiUitOpen 2:cf42e62a97dc 105 while (p != NULL) {
MikamiUitOpen 2:cf42e62a97dc 106 if (p->next == obj) {
MikamiUitOpen 2:cf42e62a97dc 107 p->next = obj->next;
MikamiUitOpen 2:cf42e62a97dc 108 break;
MikamiUitOpen 2:cf42e62a97dc 109 }
MikamiUitOpen 2:cf42e62a97dc 110 p = p->next;
MikamiUitOpen 2:cf42e62a97dc 111 }
MikamiUitOpen 2:cf42e62a97dc 112 }
MikamiUitOpen 2:cf42e62a97dc 113
MikamiUitOpen 2:cf42e62a97dc 114 __enable_irq();
MikamiUitOpen 2:cf42e62a97dc 115 }
MikamiUitOpen 2:cf42e62a97dc 116
MikamiUitOpen 2:cf42e62a97dc 117 timestamp_t ticker_read(const ticker_data_t *const data)
MikamiUitOpen 2:cf42e62a97dc 118 {
MikamiUitOpen 2:cf42e62a97dc 119 return data->interface->read();
MikamiUitOpen 2:cf42e62a97dc 120 }
MikamiUitOpen 2:cf42e62a97dc 121
MikamiUitOpen 2:cf42e62a97dc 122 int ticker_get_next_timestamp(const ticker_data_t *const data, timestamp_t *timestamp)
MikamiUitOpen 2:cf42e62a97dc 123 {
MikamiUitOpen 2:cf42e62a97dc 124 int ret = 0;
MikamiUitOpen 2:cf42e62a97dc 125
MikamiUitOpen 2:cf42e62a97dc 126 /* if head is NULL, there are no pending events */
MikamiUitOpen 2:cf42e62a97dc 127 __disable_irq();
MikamiUitOpen 2:cf42e62a97dc 128 if (data->queue->head != NULL) {
MikamiUitOpen 2:cf42e62a97dc 129 *timestamp = data->queue->head->timestamp;
MikamiUitOpen 2:cf42e62a97dc 130 ret = 1;
MikamiUitOpen 2:cf42e62a97dc 131 }
MikamiUitOpen 2:cf42e62a97dc 132 __enable_irq();
MikamiUitOpen 2:cf42e62a97dc 133
MikamiUitOpen 2:cf42e62a97dc 134 return ret;
MikamiUitOpen 2:cf42e62a97dc 135 }