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/Ticker.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 "Ticker.h"
MikamiUitOpen 2:dcaee06f6ccb 17
MikamiUitOpen 2:dcaee06f6ccb 18 #include "TimerEvent.h"
MikamiUitOpen 2:dcaee06f6ccb 19 #include "FunctionPointer.h"
MikamiUitOpen 2:dcaee06f6ccb 20 #include "ticker_api.h"
MikamiUitOpen 2:dcaee06f6ccb 21
MikamiUitOpen 2:dcaee06f6ccb 22 namespace mbed {
MikamiUitOpen 2:dcaee06f6ccb 23
MikamiUitOpen 2:dcaee06f6ccb 24 void Ticker::detach() {
MikamiUitOpen 2:dcaee06f6ccb 25 remove();
MikamiUitOpen 2:dcaee06f6ccb 26 _function.attach(0);
MikamiUitOpen 2:dcaee06f6ccb 27 }
MikamiUitOpen 2:dcaee06f6ccb 28
MikamiUitOpen 2:dcaee06f6ccb 29 void Ticker::setup(timestamp_t t) {
MikamiUitOpen 2:dcaee06f6ccb 30 remove();
MikamiUitOpen 2:dcaee06f6ccb 31 _delay = t;
MikamiUitOpen 2:dcaee06f6ccb 32 insert(_delay + ticker_read(_ticker_data));
MikamiUitOpen 2:dcaee06f6ccb 33 }
MikamiUitOpen 2:dcaee06f6ccb 34
MikamiUitOpen 2:dcaee06f6ccb 35 void Ticker::handler() {
MikamiUitOpen 2:dcaee06f6ccb 36 insert(event.timestamp + _delay);
MikamiUitOpen 2:dcaee06f6ccb 37 _function.call();
MikamiUitOpen 2:dcaee06f6ccb 38 }
MikamiUitOpen 2:dcaee06f6ccb 39
MikamiUitOpen 2:dcaee06f6ccb 40 } // namespace mbed