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/common/FileBase.cpp@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 #include "FileBase.h"
MikamiUitOpen 2:dcaee06f6ccb 17
MikamiUitOpen 2:dcaee06f6ccb 18 namespace mbed {
MikamiUitOpen 2:dcaee06f6ccb 19
MikamiUitOpen 2:dcaee06f6ccb 20 FileBase *FileBase::_head = NULL;
MikamiUitOpen 2:dcaee06f6ccb 21
MikamiUitOpen 2:dcaee06f6ccb 22 FileBase::FileBase(const char *name, PathType t) : _next(NULL),
MikamiUitOpen 2:dcaee06f6ccb 23 _name(name),
MikamiUitOpen 2:dcaee06f6ccb 24 _path_type(t) {
MikamiUitOpen 2:dcaee06f6ccb 25 if (name != NULL) {
MikamiUitOpen 2:dcaee06f6ccb 26 // put this object at head of the list
MikamiUitOpen 2:dcaee06f6ccb 27 _next = _head;
MikamiUitOpen 2:dcaee06f6ccb 28 _head = this;
MikamiUitOpen 2:dcaee06f6ccb 29 } else {
MikamiUitOpen 2:dcaee06f6ccb 30 _next = NULL;
MikamiUitOpen 2:dcaee06f6ccb 31 }
MikamiUitOpen 2:dcaee06f6ccb 32 }
MikamiUitOpen 2:dcaee06f6ccb 33
MikamiUitOpen 2:dcaee06f6ccb 34 FileBase::~FileBase() {
MikamiUitOpen 2:dcaee06f6ccb 35 if (_name != NULL) {
MikamiUitOpen 2:dcaee06f6ccb 36 // remove this object from the list
MikamiUitOpen 2:dcaee06f6ccb 37 if (_head == this) { // first in the list, so just drop me
MikamiUitOpen 2:dcaee06f6ccb 38 _head = _next;
MikamiUitOpen 2:dcaee06f6ccb 39 } else { // find the object before me, then drop me
MikamiUitOpen 2:dcaee06f6ccb 40 FileBase *p = _head;
MikamiUitOpen 2:dcaee06f6ccb 41 while (p->_next != this) {
MikamiUitOpen 2:dcaee06f6ccb 42 p = p->_next;
MikamiUitOpen 2:dcaee06f6ccb 43 }
MikamiUitOpen 2:dcaee06f6ccb 44 p->_next = _next;
MikamiUitOpen 2:dcaee06f6ccb 45 }
MikamiUitOpen 2:dcaee06f6ccb 46 }
MikamiUitOpen 2:dcaee06f6ccb 47 }
MikamiUitOpen 2:dcaee06f6ccb 48
MikamiUitOpen 2:dcaee06f6ccb 49 FileBase *FileBase::lookup(const char *name, unsigned int len) {
MikamiUitOpen 2:dcaee06f6ccb 50 FileBase *p = _head;
MikamiUitOpen 2:dcaee06f6ccb 51 while (p != NULL) {
MikamiUitOpen 2:dcaee06f6ccb 52 /* Check that p->_name matches name and is the correct length */
MikamiUitOpen 2:dcaee06f6ccb 53 if (p->_name != NULL && std::strncmp(p->_name, name, len) == 0 && std::strlen(p->_name) == len) {
MikamiUitOpen 2:dcaee06f6ccb 54 return p;
MikamiUitOpen 2:dcaee06f6ccb 55 }
MikamiUitOpen 2:dcaee06f6ccb 56 p = p->_next;
MikamiUitOpen 2:dcaee06f6ccb 57 }
MikamiUitOpen 2:dcaee06f6ccb 58 return NULL;
MikamiUitOpen 2:dcaee06f6ccb 59 }
MikamiUitOpen 2:dcaee06f6ccb 60
MikamiUitOpen 2:dcaee06f6ccb 61 FileBase *FileBase::get(int n) {
MikamiUitOpen 2:dcaee06f6ccb 62 FileBase *p = _head;
MikamiUitOpen 2:dcaee06f6ccb 63 int m = 0;
MikamiUitOpen 2:dcaee06f6ccb 64 while (p != NULL) {
MikamiUitOpen 2:dcaee06f6ccb 65 if (m == n) return p;
MikamiUitOpen 2:dcaee06f6ccb 66
MikamiUitOpen 2:dcaee06f6ccb 67 m++;
MikamiUitOpen 2:dcaee06f6ccb 68 p = p->_next;
MikamiUitOpen 2:dcaee06f6ccb 69 }
MikamiUitOpen 2:dcaee06f6ccb 70 return NULL;
MikamiUitOpen 2:dcaee06f6ccb 71 }
MikamiUitOpen 2:dcaee06f6ccb 72
MikamiUitOpen 2:dcaee06f6ccb 73 const char* FileBase::getName(void) {
MikamiUitOpen 2:dcaee06f6ccb 74 return _name;
MikamiUitOpen 2:dcaee06f6ccb 75 }
MikamiUitOpen 2:dcaee06f6ccb 76
MikamiUitOpen 2:dcaee06f6ccb 77 PathType FileBase::getPathType(void) {
MikamiUitOpen 2:dcaee06f6ccb 78 return _path_type;
MikamiUitOpen 2:dcaee06f6ccb 79 }
MikamiUitOpen 2:dcaee06f6ccb 80
MikamiUitOpen 2:dcaee06f6ccb 81 } // namespace mbed
MikamiUitOpen 2:dcaee06f6ccb 82