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/LocalFileSystem.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_LOCALFILESYSTEM_H
MikamiUitOpen 2:dcaee06f6ccb 17 #define MBED_LOCALFILESYSTEM_H
MikamiUitOpen 2:dcaee06f6ccb 18
MikamiUitOpen 2:dcaee06f6ccb 19 #include "platform.h"
MikamiUitOpen 2:dcaee06f6ccb 20
MikamiUitOpen 2:dcaee06f6ccb 21 #if DEVICE_LOCALFILESYSTEM
MikamiUitOpen 2:dcaee06f6ccb 22
MikamiUitOpen 2:dcaee06f6ccb 23 #include "FileSystemLike.h"
MikamiUitOpen 2:dcaee06f6ccb 24
MikamiUitOpen 2:dcaee06f6ccb 25 namespace mbed {
MikamiUitOpen 2:dcaee06f6ccb 26
MikamiUitOpen 2:dcaee06f6ccb 27 FILEHANDLE local_file_open(const char* name, int flags);
MikamiUitOpen 2:dcaee06f6ccb 28
MikamiUitOpen 2:dcaee06f6ccb 29 class LocalFileHandle : public FileHandle {
MikamiUitOpen 2:dcaee06f6ccb 30
MikamiUitOpen 2:dcaee06f6ccb 31 public:
MikamiUitOpen 2:dcaee06f6ccb 32 LocalFileHandle(FILEHANDLE fh);
MikamiUitOpen 2:dcaee06f6ccb 33
MikamiUitOpen 2:dcaee06f6ccb 34 virtual int close();
MikamiUitOpen 2:dcaee06f6ccb 35
MikamiUitOpen 2:dcaee06f6ccb 36 virtual ssize_t write(const void *buffer, size_t length);
MikamiUitOpen 2:dcaee06f6ccb 37
MikamiUitOpen 2:dcaee06f6ccb 38 virtual ssize_t read(void *buffer, size_t length);
MikamiUitOpen 2:dcaee06f6ccb 39
MikamiUitOpen 2:dcaee06f6ccb 40 virtual int isatty();
MikamiUitOpen 2:dcaee06f6ccb 41
MikamiUitOpen 2:dcaee06f6ccb 42 virtual off_t lseek(off_t position, int whence);
MikamiUitOpen 2:dcaee06f6ccb 43
MikamiUitOpen 2:dcaee06f6ccb 44 virtual int fsync();
MikamiUitOpen 2:dcaee06f6ccb 45
MikamiUitOpen 2:dcaee06f6ccb 46 virtual off_t flen();
MikamiUitOpen 2:dcaee06f6ccb 47
MikamiUitOpen 2:dcaee06f6ccb 48 protected:
MikamiUitOpen 2:dcaee06f6ccb 49 FILEHANDLE _fh;
MikamiUitOpen 2:dcaee06f6ccb 50 int pos;
MikamiUitOpen 2:dcaee06f6ccb 51 };
MikamiUitOpen 2:dcaee06f6ccb 52
MikamiUitOpen 2:dcaee06f6ccb 53 /** A filesystem for accessing the local mbed Microcontroller USB disk drive
MikamiUitOpen 2:dcaee06f6ccb 54 *
MikamiUitOpen 2:dcaee06f6ccb 55 * This allows programs to read and write files on the same disk drive that is used to program the
MikamiUitOpen 2:dcaee06f6ccb 56 * mbed Microcontroller. Once created, the standard C file access functions are used to open,
MikamiUitOpen 2:dcaee06f6ccb 57 * read and write files.
MikamiUitOpen 2:dcaee06f6ccb 58 *
MikamiUitOpen 2:dcaee06f6ccb 59 * Example:
MikamiUitOpen 2:dcaee06f6ccb 60 * @code
MikamiUitOpen 2:dcaee06f6ccb 61 * #include "mbed.h"
MikamiUitOpen 2:dcaee06f6ccb 62 *
MikamiUitOpen 2:dcaee06f6ccb 63 * LocalFileSystem local("local"); // Create the local filesystem under the name "local"
MikamiUitOpen 2:dcaee06f6ccb 64 *
MikamiUitOpen 2:dcaee06f6ccb 65 * int main() {
MikamiUitOpen 2:dcaee06f6ccb 66 * FILE *fp = fopen("/local/out.txt", "w"); // Open "out.txt" on the local file system for writing
MikamiUitOpen 2:dcaee06f6ccb 67 * fprintf(fp, "Hello World!");
MikamiUitOpen 2:dcaee06f6ccb 68 * fclose(fp);
MikamiUitOpen 2:dcaee06f6ccb 69 * remove("/local/out.txt"); // Removes the file "out.txt" from the local file system
MikamiUitOpen 2:dcaee06f6ccb 70 *
MikamiUitOpen 2:dcaee06f6ccb 71 * DIR *d = opendir("/local"); // Opens the root directory of the local file system
MikamiUitOpen 2:dcaee06f6ccb 72 * struct dirent *p;
MikamiUitOpen 2:dcaee06f6ccb 73 * while((p = readdir(d)) != NULL) { // Print the names of the files in the local file system
MikamiUitOpen 2:dcaee06f6ccb 74 * printf("%s\n", p->d_name); // to stdout.
MikamiUitOpen 2:dcaee06f6ccb 75 * }
MikamiUitOpen 2:dcaee06f6ccb 76 * closedir(d);
MikamiUitOpen 2:dcaee06f6ccb 77 * }
MikamiUitOpen 2:dcaee06f6ccb 78 * @endcode
MikamiUitOpen 2:dcaee06f6ccb 79 *
MikamiUitOpen 2:dcaee06f6ccb 80 * @note
MikamiUitOpen 2:dcaee06f6ccb 81 * If the microcontroller program makes an access to the local drive, it will be marked as "removed"
MikamiUitOpen 2:dcaee06f6ccb 82 * on the Host computer. This means it is no longer accessible from the Host Computer.
MikamiUitOpen 2:dcaee06f6ccb 83 *
MikamiUitOpen 2:dcaee06f6ccb 84 * The drive will only re-appear when the microcontroller program exists. Note that if the program does
MikamiUitOpen 2:dcaee06f6ccb 85 * not exit, you will need to hold down reset on the mbed Microcontroller to be able to see the drive again!
MikamiUitOpen 2:dcaee06f6ccb 86 */
MikamiUitOpen 2:dcaee06f6ccb 87 class LocalFileSystem : public FileSystemLike {
MikamiUitOpen 2:dcaee06f6ccb 88
MikamiUitOpen 2:dcaee06f6ccb 89 public:
MikamiUitOpen 2:dcaee06f6ccb 90 LocalFileSystem(const char* n) : FileSystemLike(n) {
MikamiUitOpen 2:dcaee06f6ccb 91
MikamiUitOpen 2:dcaee06f6ccb 92 }
MikamiUitOpen 2:dcaee06f6ccb 93
MikamiUitOpen 2:dcaee06f6ccb 94 virtual FileHandle *open(const char* name, int flags);
MikamiUitOpen 2:dcaee06f6ccb 95 virtual int remove(const char *filename);
MikamiUitOpen 2:dcaee06f6ccb 96 virtual DirHandle *opendir(const char *name);
MikamiUitOpen 2:dcaee06f6ccb 97 };
MikamiUitOpen 2:dcaee06f6ccb 98
MikamiUitOpen 2:dcaee06f6ccb 99 } // namespace mbed
MikamiUitOpen 2:dcaee06f6ccb 100
MikamiUitOpen 2:dcaee06f6ccb 101 #endif
MikamiUitOpen 2:dcaee06f6ccb 102
MikamiUitOpen 2:dcaee06f6ccb 103 #endif