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/AnalogIn.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_ANALOGIN_H
MikamiUitOpen 2:dcaee06f6ccb 17 #define MBED_ANALOGIN_H
MikamiUitOpen 2:dcaee06f6ccb 18
MikamiUitOpen 2:dcaee06f6ccb 19 #include "platform.h"
MikamiUitOpen 2:dcaee06f6ccb 20
MikamiUitOpen 2:dcaee06f6ccb 21 #if DEVICE_ANALOGIN
MikamiUitOpen 2:dcaee06f6ccb 22
MikamiUitOpen 2:dcaee06f6ccb 23 #include "analogin_api.h"
MikamiUitOpen 2:dcaee06f6ccb 24
MikamiUitOpen 2:dcaee06f6ccb 25 namespace mbed {
MikamiUitOpen 2:dcaee06f6ccb 26
MikamiUitOpen 2:dcaee06f6ccb 27 /** An analog input, used for reading the voltage on a pin
MikamiUitOpen 2:dcaee06f6ccb 28 *
MikamiUitOpen 2:dcaee06f6ccb 29 * Example:
MikamiUitOpen 2:dcaee06f6ccb 30 * @code
MikamiUitOpen 2:dcaee06f6ccb 31 * // Print messages when the AnalogIn is greater than 50%
MikamiUitOpen 2:dcaee06f6ccb 32 *
MikamiUitOpen 2:dcaee06f6ccb 33 * #include "mbed.h"
MikamiUitOpen 2:dcaee06f6ccb 34 *
MikamiUitOpen 2:dcaee06f6ccb 35 * AnalogIn temperature(p20);
MikamiUitOpen 2:dcaee06f6ccb 36 *
MikamiUitOpen 2:dcaee06f6ccb 37 * int main() {
MikamiUitOpen 2:dcaee06f6ccb 38 * while(1) {
MikamiUitOpen 2:dcaee06f6ccb 39 * if(temperature > 0.5) {
MikamiUitOpen 2:dcaee06f6ccb 40 * printf("Too hot! (%f)", temperature.read());
MikamiUitOpen 2:dcaee06f6ccb 41 * }
MikamiUitOpen 2:dcaee06f6ccb 42 * }
MikamiUitOpen 2:dcaee06f6ccb 43 * }
MikamiUitOpen 2:dcaee06f6ccb 44 * @endcode
MikamiUitOpen 2:dcaee06f6ccb 45 */
MikamiUitOpen 2:dcaee06f6ccb 46 class AnalogIn {
MikamiUitOpen 2:dcaee06f6ccb 47
MikamiUitOpen 2:dcaee06f6ccb 48 public:
MikamiUitOpen 2:dcaee06f6ccb 49
MikamiUitOpen 2:dcaee06f6ccb 50 /** Create an AnalogIn, connected to the specified pin
MikamiUitOpen 2:dcaee06f6ccb 51 *
MikamiUitOpen 2:dcaee06f6ccb 52 * @param pin AnalogIn pin to connect to
MikamiUitOpen 2:dcaee06f6ccb 53 * @param name (optional) A string to identify the object
MikamiUitOpen 2:dcaee06f6ccb 54 */
MikamiUitOpen 2:dcaee06f6ccb 55 AnalogIn(PinName pin) {
MikamiUitOpen 2:dcaee06f6ccb 56 analogin_init(&_adc, pin);
MikamiUitOpen 2:dcaee06f6ccb 57 }
MikamiUitOpen 2:dcaee06f6ccb 58
MikamiUitOpen 2:dcaee06f6ccb 59 /** Read the input voltage, represented as a float in the range [0.0, 1.0]
MikamiUitOpen 2:dcaee06f6ccb 60 *
MikamiUitOpen 2:dcaee06f6ccb 61 * @returns A floating-point value representing the current input voltage, measured as a percentage
MikamiUitOpen 2:dcaee06f6ccb 62 */
MikamiUitOpen 2:dcaee06f6ccb 63 float read() {
MikamiUitOpen 2:dcaee06f6ccb 64 return analogin_read(&_adc);
MikamiUitOpen 2:dcaee06f6ccb 65 }
MikamiUitOpen 2:dcaee06f6ccb 66
MikamiUitOpen 2:dcaee06f6ccb 67 /** Read the input voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
MikamiUitOpen 2:dcaee06f6ccb 68 *
MikamiUitOpen 2:dcaee06f6ccb 69 * @returns
MikamiUitOpen 2:dcaee06f6ccb 70 * 16-bit unsigned short representing the current input voltage, normalised to a 16-bit value
MikamiUitOpen 2:dcaee06f6ccb 71 */
MikamiUitOpen 2:dcaee06f6ccb 72 unsigned short read_u16() {
MikamiUitOpen 2:dcaee06f6ccb 73 return analogin_read_u16(&_adc);
MikamiUitOpen 2:dcaee06f6ccb 74 }
MikamiUitOpen 2:dcaee06f6ccb 75
MikamiUitOpen 2:dcaee06f6ccb 76 #ifdef MBED_OPERATORS
MikamiUitOpen 2:dcaee06f6ccb 77 /** An operator shorthand for read()
MikamiUitOpen 2:dcaee06f6ccb 78 *
MikamiUitOpen 2:dcaee06f6ccb 79 * The float() operator can be used as a shorthand for read() to simplify common code sequences
MikamiUitOpen 2:dcaee06f6ccb 80 *
MikamiUitOpen 2:dcaee06f6ccb 81 * Example:
MikamiUitOpen 2:dcaee06f6ccb 82 * @code
MikamiUitOpen 2:dcaee06f6ccb 83 * float x = volume.read();
MikamiUitOpen 2:dcaee06f6ccb 84 * float x = volume;
MikamiUitOpen 2:dcaee06f6ccb 85 *
MikamiUitOpen 2:dcaee06f6ccb 86 * if(volume.read() > 0.25) { ... }
MikamiUitOpen 2:dcaee06f6ccb 87 * if(volume > 0.25) { ... }
MikamiUitOpen 2:dcaee06f6ccb 88 * @endcode
MikamiUitOpen 2:dcaee06f6ccb 89 */
MikamiUitOpen 2:dcaee06f6ccb 90 operator float() {
MikamiUitOpen 2:dcaee06f6ccb 91 return read();
MikamiUitOpen 2:dcaee06f6ccb 92 }
MikamiUitOpen 2:dcaee06f6ccb 93 #endif
MikamiUitOpen 2:dcaee06f6ccb 94
MikamiUitOpen 2:dcaee06f6ccb 95 protected:
MikamiUitOpen 2:dcaee06f6ccb 96 analogin_t _adc;
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