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/DigitalIn.h@2:dcaee06f6ccb, 2016-10-02 (annotated)

Committer:
MikamiUitOpen
Date:
Sun Oct 02 10:40:44 2016 +0000
Revision:
2:dcaee06f6ccb
3

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_DIGITALIN_H
MikamiUitOpen 2:dcaee06f6ccb 17 #define MBED_DIGITALIN_H
MikamiUitOpen 2:dcaee06f6ccb 18
MikamiUitOpen 2:dcaee06f6ccb 19 #include "platform.h"
MikamiUitOpen 2:dcaee06f6ccb 20
MikamiUitOpen 2:dcaee06f6ccb 21 #include "gpio_api.h"
MikamiUitOpen 2:dcaee06f6ccb 22
MikamiUitOpen 2:dcaee06f6ccb 23 namespace mbed {
MikamiUitOpen 2:dcaee06f6ccb 24
MikamiUitOpen 2:dcaee06f6ccb 25 /** A digital input, used for reading the state of a pin
MikamiUitOpen 2:dcaee06f6ccb 26 *
MikamiUitOpen 2:dcaee06f6ccb 27 * Example:
MikamiUitOpen 2:dcaee06f6ccb 28 * @code
MikamiUitOpen 2:dcaee06f6ccb 29 * // Flash an LED while a DigitalIn is true
MikamiUitOpen 2:dcaee06f6ccb 30 *
MikamiUitOpen 2:dcaee06f6ccb 31 * #include "mbed.h"
MikamiUitOpen 2:dcaee06f6ccb 32 *
MikamiUitOpen 2:dcaee06f6ccb 33 * DigitalIn enable(p5);
MikamiUitOpen 2:dcaee06f6ccb 34 * DigitalOut led(LED1);
MikamiUitOpen 2:dcaee06f6ccb 35 *
MikamiUitOpen 2:dcaee06f6ccb 36 * int main() {
MikamiUitOpen 2:dcaee06f6ccb 37 * while(1) {
MikamiUitOpen 2:dcaee06f6ccb 38 * if(enable) {
MikamiUitOpen 2:dcaee06f6ccb 39 * led = !led;
MikamiUitOpen 2:dcaee06f6ccb 40 * }
MikamiUitOpen 2:dcaee06f6ccb 41 * wait(0.25);
MikamiUitOpen 2:dcaee06f6ccb 42 * }
MikamiUitOpen 2:dcaee06f6ccb 43 * }
MikamiUitOpen 2:dcaee06f6ccb 44 * @endcode
MikamiUitOpen 2:dcaee06f6ccb 45 */
MikamiUitOpen 2:dcaee06f6ccb 46 class DigitalIn {
MikamiUitOpen 2:dcaee06f6ccb 47
MikamiUitOpen 2:dcaee06f6ccb 48 public:
MikamiUitOpen 2:dcaee06f6ccb 49 /** Create a DigitalIn connected to the specified pin
MikamiUitOpen 2:dcaee06f6ccb 50 *
MikamiUitOpen 2:dcaee06f6ccb 51 * @param pin DigitalIn pin to connect to
MikamiUitOpen 2:dcaee06f6ccb 52 */
MikamiUitOpen 2:dcaee06f6ccb 53 DigitalIn(PinName pin) : gpio() {
MikamiUitOpen 2:dcaee06f6ccb 54 gpio_init_in(&gpio, pin);
MikamiUitOpen 2:dcaee06f6ccb 55 }
MikamiUitOpen 2:dcaee06f6ccb 56
MikamiUitOpen 2:dcaee06f6ccb 57 /** Create a DigitalIn connected to the specified pin
MikamiUitOpen 2:dcaee06f6ccb 58 *
MikamiUitOpen 2:dcaee06f6ccb 59 * @param pin DigitalIn pin to connect to
MikamiUitOpen 2:dcaee06f6ccb 60 * @param mode the initial mode of the pin
MikamiUitOpen 2:dcaee06f6ccb 61 */
MikamiUitOpen 2:dcaee06f6ccb 62 DigitalIn(PinName pin, PinMode mode) : gpio() {
MikamiUitOpen 2:dcaee06f6ccb 63 gpio_init_in_ex(&gpio, pin, mode);
MikamiUitOpen 2:dcaee06f6ccb 64 }
MikamiUitOpen 2:dcaee06f6ccb 65 /** Read the input, represented as 0 or 1 (int)
MikamiUitOpen 2:dcaee06f6ccb 66 *
MikamiUitOpen 2:dcaee06f6ccb 67 * @returns
MikamiUitOpen 2:dcaee06f6ccb 68 * An integer representing the state of the input pin,
MikamiUitOpen 2:dcaee06f6ccb 69 * 0 for logical 0, 1 for logical 1
MikamiUitOpen 2:dcaee06f6ccb 70 */
MikamiUitOpen 2:dcaee06f6ccb 71 int read() {
MikamiUitOpen 2:dcaee06f6ccb 72 return gpio_read(&gpio);
MikamiUitOpen 2:dcaee06f6ccb 73 }
MikamiUitOpen 2:dcaee06f6ccb 74
MikamiUitOpen 2:dcaee06f6ccb 75 /** Set the input pin mode
MikamiUitOpen 2:dcaee06f6ccb 76 *
MikamiUitOpen 2:dcaee06f6ccb 77 * @param mode PullUp, PullDown, PullNone, OpenDrain
MikamiUitOpen 2:dcaee06f6ccb 78 */
MikamiUitOpen 2:dcaee06f6ccb 79 void mode(PinMode pull) {
MikamiUitOpen 2:dcaee06f6ccb 80 gpio_mode(&gpio, pull);
MikamiUitOpen 2:dcaee06f6ccb 81 }
MikamiUitOpen 2:dcaee06f6ccb 82
MikamiUitOpen 2:dcaee06f6ccb 83 /** Return the output setting, represented as 0 or 1 (int)
MikamiUitOpen 2:dcaee06f6ccb 84 *
MikamiUitOpen 2:dcaee06f6ccb 85 * @returns
MikamiUitOpen 2:dcaee06f6ccb 86 * Non zero value if pin is connected to uc GPIO
MikamiUitOpen 2:dcaee06f6ccb 87 * 0 if gpio object was initialized with NC
MikamiUitOpen 2:dcaee06f6ccb 88 */
MikamiUitOpen 2:dcaee06f6ccb 89 int is_connected() {
MikamiUitOpen 2:dcaee06f6ccb 90 return gpio_is_connected(&gpio);
MikamiUitOpen 2:dcaee06f6ccb 91 }
MikamiUitOpen 2:dcaee06f6ccb 92
MikamiUitOpen 2:dcaee06f6ccb 93 #ifdef MBED_OPERATORS
MikamiUitOpen 2:dcaee06f6ccb 94 /** An operator shorthand for read()
MikamiUitOpen 2:dcaee06f6ccb 95 */
MikamiUitOpen 2:dcaee06f6ccb 96 operator int() {
MikamiUitOpen 2:dcaee06f6ccb 97 return read();
MikamiUitOpen 2:dcaee06f6ccb 98 }
MikamiUitOpen 2:dcaee06f6ccb 99 #endif
MikamiUitOpen 2:dcaee06f6ccb 100
MikamiUitOpen 2:dcaee06f6ccb 101 protected:
MikamiUitOpen 2:dcaee06f6ccb 102 gpio_t gpio;
MikamiUitOpen 2:dcaee06f6ccb 103 };
MikamiUitOpen 2:dcaee06f6ccb 104
MikamiUitOpen 2:dcaee06f6ccb 105 } // namespace mbed
MikamiUitOpen 2:dcaee06f6ccb 106
MikamiUitOpen 2:dcaee06f6ccb 107 #endif