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/FileSystemLike.cpp@2:cf42e62a97dc, 2016-10-02 (annotated)

Committer:
MikamiUitOpen
Date:
Sun Oct 02 03:29:34 2016 +0000
Revision:
2:cf42e62a97dc
3

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 2:cf42e62a97dc 1 /* mbed Microcontroller Library
MikamiUitOpen 2:cf42e62a97dc 2 * Copyright (c) 2006-2013 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 "FileSystemLike.h"
MikamiUitOpen 2:cf42e62a97dc 17
MikamiUitOpen 2:cf42e62a97dc 18 namespace mbed {
MikamiUitOpen 2:cf42e62a97dc 19
MikamiUitOpen 2:cf42e62a97dc 20 class BaseDirHandle : public DirHandle {
MikamiUitOpen 2:cf42e62a97dc 21 public:
MikamiUitOpen 2:cf42e62a97dc 22 /*
MikamiUitOpen 2:cf42e62a97dc 23 We keep track of our current location as the n'th object in the
MikamiUitOpen 2:cf42e62a97dc 24 FileSystemLike list. Using a Base* instead would cause problems if that
MikamiUitOpen 2:cf42e62a97dc 25 object were to be destroyed between readdirs.
MikamiUitOpen 2:cf42e62a97dc 26 Using this method does mean though that destroying/creating objects can
MikamiUitOpen 2:cf42e62a97dc 27 give unusual results from readdir.
MikamiUitOpen 2:cf42e62a97dc 28 */
MikamiUitOpen 2:cf42e62a97dc 29 off_t n;
MikamiUitOpen 2:cf42e62a97dc 30 struct dirent cur_entry;
MikamiUitOpen 2:cf42e62a97dc 31
MikamiUitOpen 2:cf42e62a97dc 32 BaseDirHandle() : n(0), cur_entry() {
MikamiUitOpen 2:cf42e62a97dc 33 }
MikamiUitOpen 2:cf42e62a97dc 34
MikamiUitOpen 2:cf42e62a97dc 35 virtual int closedir() {
MikamiUitOpen 2:cf42e62a97dc 36 delete this;
MikamiUitOpen 2:cf42e62a97dc 37 return 0;
MikamiUitOpen 2:cf42e62a97dc 38 }
MikamiUitOpen 2:cf42e62a97dc 39
MikamiUitOpen 2:cf42e62a97dc 40 virtual struct dirent *readdir() {
MikamiUitOpen 2:cf42e62a97dc 41 FileBase *ptr = FileBase::get(n);
MikamiUitOpen 2:cf42e62a97dc 42 if (ptr == NULL) return NULL;
MikamiUitOpen 2:cf42e62a97dc 43
MikamiUitOpen 2:cf42e62a97dc 44 /* Increment n, so next readdir gets the next item */
MikamiUitOpen 2:cf42e62a97dc 45 n++;
MikamiUitOpen 2:cf42e62a97dc 46
MikamiUitOpen 2:cf42e62a97dc 47 /* Setup cur entry and return a pointer to it */
MikamiUitOpen 2:cf42e62a97dc 48 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
MikamiUitOpen 2:cf42e62a97dc 49 return &cur_entry;
MikamiUitOpen 2:cf42e62a97dc 50 }
MikamiUitOpen 2:cf42e62a97dc 51
MikamiUitOpen 2:cf42e62a97dc 52 virtual off_t telldir() {
MikamiUitOpen 2:cf42e62a97dc 53 return n;
MikamiUitOpen 2:cf42e62a97dc 54 }
MikamiUitOpen 2:cf42e62a97dc 55
MikamiUitOpen 2:cf42e62a97dc 56 virtual void seekdir(off_t offset) {
MikamiUitOpen 2:cf42e62a97dc 57 n = offset;
MikamiUitOpen 2:cf42e62a97dc 58 }
MikamiUitOpen 2:cf42e62a97dc 59
MikamiUitOpen 2:cf42e62a97dc 60 virtual void rewinddir() {
MikamiUitOpen 2:cf42e62a97dc 61 n = 0;
MikamiUitOpen 2:cf42e62a97dc 62 }
MikamiUitOpen 2:cf42e62a97dc 63 };
MikamiUitOpen 2:cf42e62a97dc 64
MikamiUitOpen 2:cf42e62a97dc 65 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
MikamiUitOpen 2:cf42e62a97dc 66
MikamiUitOpen 2:cf42e62a97dc 67 }
MikamiUitOpen 2:cf42e62a97dc 68
MikamiUitOpen 2:cf42e62a97dc 69 FileSystemLike::~FileSystemLike() {
MikamiUitOpen 2:cf42e62a97dc 70
MikamiUitOpen 2:cf42e62a97dc 71 }
MikamiUitOpen 2:cf42e62a97dc 72
MikamiUitOpen 2:cf42e62a97dc 73 DirHandle *FileSystemLike::opendir() {
MikamiUitOpen 2:cf42e62a97dc 74 return new BaseDirHandle();
MikamiUitOpen 2:cf42e62a97dc 75 }
MikamiUitOpen 2:cf42e62a97dc 76
MikamiUitOpen 2:cf42e62a97dc 77 } // namespace mbed