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/SPISlave.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_SPISLAVE_H
MikamiUitOpen 2:dcaee06f6ccb 17 #define MBED_SPISLAVE_H
MikamiUitOpen 2:dcaee06f6ccb 18
MikamiUitOpen 2:dcaee06f6ccb 19 #include "platform.h"
MikamiUitOpen 2:dcaee06f6ccb 20
MikamiUitOpen 2:dcaee06f6ccb 21 #if DEVICE_SPISLAVE
MikamiUitOpen 2:dcaee06f6ccb 22
MikamiUitOpen 2:dcaee06f6ccb 23 #include "spi_api.h"
MikamiUitOpen 2:dcaee06f6ccb 24
MikamiUitOpen 2:dcaee06f6ccb 25 namespace mbed {
MikamiUitOpen 2:dcaee06f6ccb 26
MikamiUitOpen 2:dcaee06f6ccb 27 /** A SPI slave, used for communicating with a SPI Master device
MikamiUitOpen 2:dcaee06f6ccb 28 *
MikamiUitOpen 2:dcaee06f6ccb 29 * The default format is set to 8-bits, mode 0, and a clock frequency of 1MHz
MikamiUitOpen 2:dcaee06f6ccb 30 *
MikamiUitOpen 2:dcaee06f6ccb 31 * Example:
MikamiUitOpen 2:dcaee06f6ccb 32 * @code
MikamiUitOpen 2:dcaee06f6ccb 33 * // Reply to a SPI master as slave
MikamiUitOpen 2:dcaee06f6ccb 34 *
MikamiUitOpen 2:dcaee06f6ccb 35 * #include "mbed.h"
MikamiUitOpen 2:dcaee06f6ccb 36 *
MikamiUitOpen 2:dcaee06f6ccb 37 * SPISlave device(p5, p6, p7, p8); // mosi, miso, sclk, ssel
MikamiUitOpen 2:dcaee06f6ccb 38 *
MikamiUitOpen 2:dcaee06f6ccb 39 * int main() {
MikamiUitOpen 2:dcaee06f6ccb 40 * device.reply(0x00); // Prime SPI with first reply
MikamiUitOpen 2:dcaee06f6ccb 41 * while(1) {
MikamiUitOpen 2:dcaee06f6ccb 42 * if(device.receive()) {
MikamiUitOpen 2:dcaee06f6ccb 43 * int v = device.read(); // Read byte from master
MikamiUitOpen 2:dcaee06f6ccb 44 * v = (v + 1) % 0x100; // Add one to it, modulo 256
MikamiUitOpen 2:dcaee06f6ccb 45 * device.reply(v); // Make this the next reply
MikamiUitOpen 2:dcaee06f6ccb 46 * }
MikamiUitOpen 2:dcaee06f6ccb 47 * }
MikamiUitOpen 2:dcaee06f6ccb 48 * }
MikamiUitOpen 2:dcaee06f6ccb 49 * @endcode
MikamiUitOpen 2:dcaee06f6ccb 50 */
MikamiUitOpen 2:dcaee06f6ccb 51 class SPISlave {
MikamiUitOpen 2:dcaee06f6ccb 52
MikamiUitOpen 2:dcaee06f6ccb 53 public:
MikamiUitOpen 2:dcaee06f6ccb 54
MikamiUitOpen 2:dcaee06f6ccb 55 /** Create a SPI slave connected to the specified pins
MikamiUitOpen 2:dcaee06f6ccb 56 *
MikamiUitOpen 2:dcaee06f6ccb 57 * mosi or miso can be specfied as NC if not used
MikamiUitOpen 2:dcaee06f6ccb 58 *
MikamiUitOpen 2:dcaee06f6ccb 59 * @param mosi SPI Master Out, Slave In pin
MikamiUitOpen 2:dcaee06f6ccb 60 * @param miso SPI Master In, Slave Out pin
MikamiUitOpen 2:dcaee06f6ccb 61 * @param sclk SPI Clock pin
MikamiUitOpen 2:dcaee06f6ccb 62 * @param ssel SPI chip select pin
MikamiUitOpen 2:dcaee06f6ccb 63 */
MikamiUitOpen 2:dcaee06f6ccb 64 SPISlave(PinName mosi, PinName miso, PinName sclk, PinName ssel);
MikamiUitOpen 2:dcaee06f6ccb 65
MikamiUitOpen 2:dcaee06f6ccb 66 /** Configure the data transmission format
MikamiUitOpen 2:dcaee06f6ccb 67 *
MikamiUitOpen 2:dcaee06f6ccb 68 * @param bits Number of bits per SPI frame (4 - 16)
MikamiUitOpen 2:dcaee06f6ccb 69 * @param mode Clock polarity and phase mode (0 - 3)
MikamiUitOpen 2:dcaee06f6ccb 70 *
MikamiUitOpen 2:dcaee06f6ccb 71 * @code
MikamiUitOpen 2:dcaee06f6ccb 72 * mode | POL PHA
MikamiUitOpen 2:dcaee06f6ccb 73 * -----+--------
MikamiUitOpen 2:dcaee06f6ccb 74 * 0 | 0 0
MikamiUitOpen 2:dcaee06f6ccb 75 * 1 | 0 1
MikamiUitOpen 2:dcaee06f6ccb 76 * 2 | 1 0
MikamiUitOpen 2:dcaee06f6ccb 77 * 3 | 1 1
MikamiUitOpen 2:dcaee06f6ccb 78 * @endcode
MikamiUitOpen 2:dcaee06f6ccb 79 */
MikamiUitOpen 2:dcaee06f6ccb 80 void format(int bits, int mode = 0);
MikamiUitOpen 2:dcaee06f6ccb 81
MikamiUitOpen 2:dcaee06f6ccb 82 /** Set the spi bus clock frequency
MikamiUitOpen 2:dcaee06f6ccb 83 *
MikamiUitOpen 2:dcaee06f6ccb 84 * @param hz SCLK frequency in hz (default = 1MHz)
MikamiUitOpen 2:dcaee06f6ccb 85 */
MikamiUitOpen 2:dcaee06f6ccb 86 void frequency(int hz = 1000000);
MikamiUitOpen 2:dcaee06f6ccb 87
MikamiUitOpen 2:dcaee06f6ccb 88 /** Polls the SPI to see if data has been received
MikamiUitOpen 2:dcaee06f6ccb 89 *
MikamiUitOpen 2:dcaee06f6ccb 90 * @returns
MikamiUitOpen 2:dcaee06f6ccb 91 * 0 if no data,
MikamiUitOpen 2:dcaee06f6ccb 92 * 1 otherwise
MikamiUitOpen 2:dcaee06f6ccb 93 */
MikamiUitOpen 2:dcaee06f6ccb 94 int receive(void);
MikamiUitOpen 2:dcaee06f6ccb 95
MikamiUitOpen 2:dcaee06f6ccb 96 /** Retrieve data from receive buffer as slave
MikamiUitOpen 2:dcaee06f6ccb 97 *
MikamiUitOpen 2:dcaee06f6ccb 98 * @returns
MikamiUitOpen 2:dcaee06f6ccb 99 * the data in the receive buffer
MikamiUitOpen 2:dcaee06f6ccb 100 */
MikamiUitOpen 2:dcaee06f6ccb 101 int read(void);
MikamiUitOpen 2:dcaee06f6ccb 102
MikamiUitOpen 2:dcaee06f6ccb 103 /** Fill the transmission buffer with the value to be written out
MikamiUitOpen 2:dcaee06f6ccb 104 * as slave on the next received message from the master.
MikamiUitOpen 2:dcaee06f6ccb 105 *
MikamiUitOpen 2:dcaee06f6ccb 106 * @param value the data to be transmitted next
MikamiUitOpen 2:dcaee06f6ccb 107 */
MikamiUitOpen 2:dcaee06f6ccb 108 void reply(int value);
MikamiUitOpen 2:dcaee06f6ccb 109
MikamiUitOpen 2:dcaee06f6ccb 110 protected:
MikamiUitOpen 2:dcaee06f6ccb 111 spi_t _spi;
MikamiUitOpen 2:dcaee06f6ccb 112
MikamiUitOpen 2:dcaee06f6ccb 113 int _bits;
MikamiUitOpen 2:dcaee06f6ccb 114 int _mode;
MikamiUitOpen 2:dcaee06f6ccb 115 int _hz;
MikamiUitOpen 2:dcaee06f6ccb 116 };
MikamiUitOpen 2:dcaee06f6ccb 117
MikamiUitOpen 2:dcaee06f6ccb 118 } // namespace mbed
MikamiUitOpen 2:dcaee06f6ccb 119
MikamiUitOpen 2:dcaee06f6ccb 120 #endif
MikamiUitOpen 2:dcaee06f6ccb 121
MikamiUitOpen 2:dcaee06f6ccb 122 #endif