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/wait_api.h

Committer:
MikamiUitOpen
Date:
2016-10-02
Revision:
2:dcaee06f6ccb

File content as of revision 2:dcaee06f6ccb:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef MBED_WAIT_API_H
#define MBED_WAIT_API_H

#ifdef __cplusplus
extern "C" {
#endif

/** Generic wait functions.
 *
 * These provide simple NOP type wait capabilities.
 *
 * Example:
 * @code
 * #include "mbed.h"
 *
 * DigitalOut heartbeat(LED1);
 *
 * int main() {
 *     while (1) {
 *         heartbeat = 1;
 *         wait(0.5);
 *         heartbeat = 0;
 *         wait(0.5);
 *     }
 * }
 */

/** Waits for a number of seconds, with microsecond resolution (within
 *  the accuracy of single precision floating point).
 *
 *  @param s number of seconds to wait
 */
void wait(float s);

/** Waits a number of milliseconds.
 *
 *  @param ms the whole number of milliseconds to wait
 */
void wait_ms(int ms);

/** Waits a number of microseconds.
 *
 *  @param us the whole number of microseconds to wait
 */
void wait_us(int us);

#ifdef __cplusplus
}
#endif

#endif