不韋 呂 / F746_SD_VarableFilter

SD card player with variable cotoff frequency lowpass and highpass IIR filter. SD カードの *.wav ファイルのオーディオ信号を，遮断周波数可変 IIR 低域通過および高域通過フィルタを通して，ボードに搭載されているCODEC で出力する．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8月号で解説している．

Dependencies:   F746_GUI F746_SAI_IO FrequencyResponseDrawer SD_PlayerSkeleton

mbed_src_STM32F7/api/FileSystemLike.h@11:399670d24ed9, 2017-04-10 (annotated)

Committer:
MikamiUitOpen
Date:
Mon Apr 10 01:44:22 2017 +0000
Revision:
11:399670d24ed9
Parent:
2:dcaee06f6ccb 
12

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 2:dcaee06f6ccb 1 /* mbed Microcontroller Library
MikamiUitOpen 2:dcaee06f6ccb 2 * Copyright (c) 2006-2013 ARM Limited
MikamiUitOpen 2:dcaee06f6ccb 3 *
MikamiUitOpen 2:dcaee06f6ccb 4 * Licensed under the Apache License, Version 2.0 (the "License");
MikamiUitOpen 2:dcaee06f6ccb 5 * you may not use this file except in compliance with the License.
MikamiUitOpen 2:dcaee06f6ccb 6 * You may obtain a copy of the License at
MikamiUitOpen 2:dcaee06f6ccb 7 *
MikamiUitOpen 2:dcaee06f6ccb 8 * http://www.apache.org/licenses/LICENSE-2.0
MikamiUitOpen 2:dcaee06f6ccb 9 *
MikamiUitOpen 2:dcaee06f6ccb 10 * Unless required by applicable law or agreed to in writing, software
MikamiUitOpen 2:dcaee06f6ccb 11 * distributed under the License is distributed on an "AS IS" BASIS,
MikamiUitOpen 2:dcaee06f6ccb 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MikamiUitOpen 2:dcaee06f6ccb 13 * See the License for the specific language governing permissions and
MikamiUitOpen 2:dcaee06f6ccb 14 * limitations under the License.
MikamiUitOpen 2:dcaee06f6ccb 15 */
MikamiUitOpen 2:dcaee06f6ccb 16 #ifndef MBED_FILESYSTEMLIKE_H
MikamiUitOpen 2:dcaee06f6ccb 17 #define MBED_FILESYSTEMLIKE_H
MikamiUitOpen 2:dcaee06f6ccb 18
MikamiUitOpen 2:dcaee06f6ccb 19 #include "platform.h"
MikamiUitOpen 2:dcaee06f6ccb 20
MikamiUitOpen 2:dcaee06f6ccb 21 #include "FileBase.h"
MikamiUitOpen 2:dcaee06f6ccb 22 #include "FileHandle.h"
MikamiUitOpen 2:dcaee06f6ccb 23 #include "DirHandle.h"
MikamiUitOpen 2:dcaee06f6ccb 24
MikamiUitOpen 2:dcaee06f6ccb 25 namespace mbed {
MikamiUitOpen 2:dcaee06f6ccb 26
MikamiUitOpen 2:dcaee06f6ccb 27 /** A filesystem-like object is one that can be used to open files
MikamiUitOpen 2:dcaee06f6ccb 28 * though it by fopen("/name/filename", mode)
MikamiUitOpen 2:dcaee06f6ccb 29 *
MikamiUitOpen 2:dcaee06f6ccb 30 * Implementations must define at least open (the default definitions
MikamiUitOpen 2:dcaee06f6ccb 31 * of the rest of the functions just return error values).
MikamiUitOpen 2:dcaee06f6ccb 32 */
MikamiUitOpen 2:dcaee06f6ccb 33 class FileSystemLike : public FileBase {
MikamiUitOpen 2:dcaee06f6ccb 34
MikamiUitOpen 2:dcaee06f6ccb 35 public:
MikamiUitOpen 2:dcaee06f6ccb 36 /** FileSystemLike constructor
MikamiUitOpen 2:dcaee06f6ccb 37 *
MikamiUitOpen 2:dcaee06f6ccb 38 * @param name The name to use for the filesystem.
MikamiUitOpen 2:dcaee06f6ccb 39 */
MikamiUitOpen 2:dcaee06f6ccb 40 FileSystemLike(const char *name);
MikamiUitOpen 2:dcaee06f6ccb 41
MikamiUitOpen 2:dcaee06f6ccb 42 virtual ~FileSystemLike();
MikamiUitOpen 2:dcaee06f6ccb 43
MikamiUitOpen 2:dcaee06f6ccb 44 static DirHandle *opendir();
MikamiUitOpen 2:dcaee06f6ccb 45 friend class BaseDirHandle;
MikamiUitOpen 2:dcaee06f6ccb 46
MikamiUitOpen 2:dcaee06f6ccb 47 /** Opens a file from the filesystem
MikamiUitOpen 2:dcaee06f6ccb 48 *
MikamiUitOpen 2:dcaee06f6ccb 49 * @param filename The name of the file to open.
MikamiUitOpen 2:dcaee06f6ccb 50 * @param flags One of O_RDONLY, O_WRONLY, or O_RDWR, OR'd with
MikamiUitOpen 2:dcaee06f6ccb 51 * zero or more of O_CREAT, O_TRUNC, or O_APPEND.
MikamiUitOpen 2:dcaee06f6ccb 52 *
MikamiUitOpen 2:dcaee06f6ccb 53 * @returns
MikamiUitOpen 2:dcaee06f6ccb 54 * A pointer to a FileHandle object representing the
MikamiUitOpen 2:dcaee06f6ccb 55 * file on success, or NULL on failure.
MikamiUitOpen 2:dcaee06f6ccb 56 */
MikamiUitOpen 2:dcaee06f6ccb 57 virtual FileHandle *open(const char *filename, int flags) = 0;
MikamiUitOpen 2:dcaee06f6ccb 58
MikamiUitOpen 2:dcaee06f6ccb 59 /** Remove a file from the filesystem.
MikamiUitOpen 2:dcaee06f6ccb 60 *
MikamiUitOpen 2:dcaee06f6ccb 61 * @param filename the name of the file to remove.
MikamiUitOpen 2:dcaee06f6ccb 62 * @param returns 0 on success, -1 on failure.
MikamiUitOpen 2:dcaee06f6ccb 63 */
MikamiUitOpen 2:dcaee06f6ccb 64 virtual int remove(const char *filename) { return -1; };
MikamiUitOpen 2:dcaee06f6ccb 65
MikamiUitOpen 2:dcaee06f6ccb 66 /** Rename a file in the filesystem.
MikamiUitOpen 2:dcaee06f6ccb 67 *
MikamiUitOpen 2:dcaee06f6ccb 68 * @param oldname the name of the file to rename.
MikamiUitOpen 2:dcaee06f6ccb 69 * @param newname the name to rename it to.
MikamiUitOpen 2:dcaee06f6ccb 70 *
MikamiUitOpen 2:dcaee06f6ccb 71 * @returns
MikamiUitOpen 2:dcaee06f6ccb 72 * 0 on success,
MikamiUitOpen 2:dcaee06f6ccb 73 * -1 on failure.
MikamiUitOpen 2:dcaee06f6ccb 74 */
MikamiUitOpen 2:dcaee06f6ccb 75 virtual int rename(const char *oldname, const char *newname) { return -1; };
MikamiUitOpen 2:dcaee06f6ccb 76
MikamiUitOpen 2:dcaee06f6ccb 77 /** Opens a directory in the filesystem and returns a DirHandle
MikamiUitOpen 2:dcaee06f6ccb 78 * representing the directory stream.
MikamiUitOpen 2:dcaee06f6ccb 79 *
MikamiUitOpen 2:dcaee06f6ccb 80 * @param name The name of the directory to open.
MikamiUitOpen 2:dcaee06f6ccb 81 *
MikamiUitOpen 2:dcaee06f6ccb 82 * @returns
MikamiUitOpen 2:dcaee06f6ccb 83 * A DirHandle representing the directory stream, or
MikamiUitOpen 2:dcaee06f6ccb 84 * NULL on failure.
MikamiUitOpen 2:dcaee06f6ccb 85 */
MikamiUitOpen 2:dcaee06f6ccb 86 virtual DirHandle *opendir(const char *name) { return NULL; };
MikamiUitOpen 2:dcaee06f6ccb 87
MikamiUitOpen 2:dcaee06f6ccb 88 /** Creates a directory in the filesystem.
MikamiUitOpen 2:dcaee06f6ccb 89 *
MikamiUitOpen 2:dcaee06f6ccb 90 * @param name The name of the directory to create.
MikamiUitOpen 2:dcaee06f6ccb 91 * @param mode The permissions to create the directory with.
MikamiUitOpen 2:dcaee06f6ccb 92 *
MikamiUitOpen 2:dcaee06f6ccb 93 * @returns
MikamiUitOpen 2:dcaee06f6ccb 94 * 0 on success,
MikamiUitOpen 2:dcaee06f6ccb 95 * -1 on failure.
MikamiUitOpen 2:dcaee06f6ccb 96 */
MikamiUitOpen 2:dcaee06f6ccb 97 virtual int mkdir(const char *name, mode_t mode) { return -1; }
MikamiUitOpen 2:dcaee06f6ccb 98
MikamiUitOpen 2:dcaee06f6ccb 99 // TODO other filesystem functions (mkdir, rm, rn, ls etc)
MikamiUitOpen 2:dcaee06f6ccb 100 };
MikamiUitOpen 2:dcaee06f6ccb 101
MikamiUitOpen 2:dcaee06f6ccb 102 } // namespace mbed
MikamiUitOpen 2:dcaee06f6ccb 103
MikamiUitOpen 2:dcaee06f6ccb 104 #endif