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/DirHandle.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_DIRHANDLE_H
MikamiUitOpen 2:dcaee06f6ccb 17 #define MBED_DIRHANDLE_H
MikamiUitOpen 2:dcaee06f6ccb 18
MikamiUitOpen 2:dcaee06f6ccb 19 #if defined(__ARMCC_VERSION) || defined(__ICCARM__)
MikamiUitOpen 2:dcaee06f6ccb 20 # define NAME_MAX 255
MikamiUitOpen 2:dcaee06f6ccb 21 typedef int mode_t;
MikamiUitOpen 2:dcaee06f6ccb 22
MikamiUitOpen 2:dcaee06f6ccb 23 #else
MikamiUitOpen 2:dcaee06f6ccb 24 # include <sys/syslimits.h>
MikamiUitOpen 2:dcaee06f6ccb 25 #endif
MikamiUitOpen 2:dcaee06f6ccb 26
MikamiUitOpen 2:dcaee06f6ccb 27 #include "FileHandle.h"
MikamiUitOpen 2:dcaee06f6ccb 28
MikamiUitOpen 2:dcaee06f6ccb 29 struct dirent {
MikamiUitOpen 2:dcaee06f6ccb 30 char d_name[NAME_MAX+1];
MikamiUitOpen 2:dcaee06f6ccb 31 };
MikamiUitOpen 2:dcaee06f6ccb 32
MikamiUitOpen 2:dcaee06f6ccb 33 namespace mbed {
MikamiUitOpen 2:dcaee06f6ccb 34
MikamiUitOpen 2:dcaee06f6ccb 35 /** Represents a directory stream. Objects of this type are returned
MikamiUitOpen 2:dcaee06f6ccb 36 * by a FileSystemLike's opendir method. Implementations must define
MikamiUitOpen 2:dcaee06f6ccb 37 * at least closedir, readdir and rewinddir.
MikamiUitOpen 2:dcaee06f6ccb 38 *
MikamiUitOpen 2:dcaee06f6ccb 39 * If a FileSystemLike class defines the opendir method, then the
MikamiUitOpen 2:dcaee06f6ccb 40 * directories of an object of that type can be accessed by
MikamiUitOpen 2:dcaee06f6ccb 41 * DIR *d = opendir("/example/directory") (or opendir("/example")
MikamiUitOpen 2:dcaee06f6ccb 42 * to open the root of the filesystem), and then using readdir(d) etc.
MikamiUitOpen 2:dcaee06f6ccb 43 *
MikamiUitOpen 2:dcaee06f6ccb 44 * The root directory is considered to contain all FileLike and
MikamiUitOpen 2:dcaee06f6ccb 45 * FileSystemLike objects, so the DIR* returned by opendir("/") will
MikamiUitOpen 2:dcaee06f6ccb 46 * reflect this.
MikamiUitOpen 2:dcaee06f6ccb 47 */
MikamiUitOpen 2:dcaee06f6ccb 48 class DirHandle {
MikamiUitOpen 2:dcaee06f6ccb 49
MikamiUitOpen 2:dcaee06f6ccb 50 public:
MikamiUitOpen 2:dcaee06f6ccb 51 /** Closes the directory.
MikamiUitOpen 2:dcaee06f6ccb 52 *
MikamiUitOpen 2:dcaee06f6ccb 53 * @returns
MikamiUitOpen 2:dcaee06f6ccb 54 * 0 on success,
MikamiUitOpen 2:dcaee06f6ccb 55 * -1 on error.
MikamiUitOpen 2:dcaee06f6ccb 56 */
MikamiUitOpen 2:dcaee06f6ccb 57 virtual int closedir()=0;
MikamiUitOpen 2:dcaee06f6ccb 58
MikamiUitOpen 2:dcaee06f6ccb 59 /** Return the directory entry at the current position, and
MikamiUitOpen 2:dcaee06f6ccb 60 * advances the position to the next entry.
MikamiUitOpen 2:dcaee06f6ccb 61 *
MikamiUitOpen 2:dcaee06f6ccb 62 * @returns
MikamiUitOpen 2:dcaee06f6ccb 63 * A pointer to a dirent structure representing the
MikamiUitOpen 2:dcaee06f6ccb 64 * directory entry at the current position, or NULL on reaching
MikamiUitOpen 2:dcaee06f6ccb 65 * end of directory or error.
MikamiUitOpen 2:dcaee06f6ccb 66 */
MikamiUitOpen 2:dcaee06f6ccb 67 virtual struct dirent *readdir()=0;
MikamiUitOpen 2:dcaee06f6ccb 68
MikamiUitOpen 2:dcaee06f6ccb 69 /** Resets the position to the beginning of the directory.
MikamiUitOpen 2:dcaee06f6ccb 70 */
MikamiUitOpen 2:dcaee06f6ccb 71 virtual void rewinddir()=0;
MikamiUitOpen 2:dcaee06f6ccb 72
MikamiUitOpen 2:dcaee06f6ccb 73 /** Returns the current position of the DirHandle.
MikamiUitOpen 2:dcaee06f6ccb 74 *
MikamiUitOpen 2:dcaee06f6ccb 75 * @returns
MikamiUitOpen 2:dcaee06f6ccb 76 * the current position,
MikamiUitOpen 2:dcaee06f6ccb 77 * -1 on error.
MikamiUitOpen 2:dcaee06f6ccb 78 */
MikamiUitOpen 2:dcaee06f6ccb 79 virtual off_t telldir() { return -1; }
MikamiUitOpen 2:dcaee06f6ccb 80
MikamiUitOpen 2:dcaee06f6ccb 81 /** Sets the position of the DirHandle.
MikamiUitOpen 2:dcaee06f6ccb 82 *
MikamiUitOpen 2:dcaee06f6ccb 83 * @param location The location to seek to. Must be a value returned by telldir.
MikamiUitOpen 2:dcaee06f6ccb 84 */
MikamiUitOpen 2:dcaee06f6ccb 85 virtual void seekdir(off_t location) { }
MikamiUitOpen 2:dcaee06f6ccb 86
MikamiUitOpen 2:dcaee06f6ccb 87 virtual ~DirHandle() {}
MikamiUitOpen 2:dcaee06f6ccb 88 };
MikamiUitOpen 2:dcaee06f6ccb 89
MikamiUitOpen 2:dcaee06f6ccb 90 } // namespace mbed
MikamiUitOpen 2:dcaee06f6ccb 91
MikamiUitOpen 2:dcaee06f6ccb 92 typedef mbed::DirHandle DIR;
MikamiUitOpen 2:dcaee06f6ccb 93
MikamiUitOpen 2:dcaee06f6ccb 94 extern "C" {
MikamiUitOpen 2:dcaee06f6ccb 95 DIR *opendir(const char*);
MikamiUitOpen 2:dcaee06f6ccb 96 struct dirent *readdir(DIR *);
MikamiUitOpen 2:dcaee06f6ccb 97 int closedir(DIR*);
MikamiUitOpen 2:dcaee06f6ccb 98 void rewinddir(DIR*);
MikamiUitOpen 2:dcaee06f6ccb 99 long telldir(DIR*);
MikamiUitOpen 2:dcaee06f6ccb 100 void seekdir(DIR*, long);
MikamiUitOpen 2:dcaee06f6ccb 101 int mkdir(const char *name, mode_t n);
MikamiUitOpen 2:dcaee06f6ccb 102 };
MikamiUitOpen 2:dcaee06f6ccb 103
MikamiUitOpen 2:dcaee06f6ccb 104 #endif /* MBED_DIRHANDLE_H */