不韋 呂 / F746_Spectrogram

Realtime spectrogram for DISCO-F746NG. On-board MEMS microphone is used for input sound signal. リアルタイムスペクトログラム．入力：MEMSマイク

Dependencies:   F746_GUI F746_SAI_IO UIT_FFT_Real

mbed_src_STM32F7/common/I2C.cpp@6:b3885567877c, 2017-04-10 (annotated)

Committer:
MikamiUitOpen
Date:
Mon Apr 10 13:43:07 2017 +0000
Revision:
6:b3885567877c
Parent:
4:c1beacfc42c7 
7

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 4:c1beacfc42c7 1 /* mbed Microcontroller Library
MikamiUitOpen 4:c1beacfc42c7 2 * Copyright (c) 2006-2015 ARM Limited
MikamiUitOpen 4:c1beacfc42c7 3 *
MikamiUitOpen 4:c1beacfc42c7 4 * Licensed under the Apache License, Version 2.0 (the "License");
MikamiUitOpen 4:c1beacfc42c7 5 * you may not use this file except in compliance with the License.
MikamiUitOpen 4:c1beacfc42c7 6 * You may obtain a copy of the License at
MikamiUitOpen 4:c1beacfc42c7 7 *
MikamiUitOpen 4:c1beacfc42c7 8 * http://www.apache.org/licenses/LICENSE-2.0
MikamiUitOpen 4:c1beacfc42c7 9 *
MikamiUitOpen 4:c1beacfc42c7 10 * Unless required by applicable law or agreed to in writing, software
MikamiUitOpen 4:c1beacfc42c7 11 * distributed under the License is distributed on an "AS IS" BASIS,
MikamiUitOpen 4:c1beacfc42c7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MikamiUitOpen 4:c1beacfc42c7 13 * See the License for the specific language governing permissions and
MikamiUitOpen 4:c1beacfc42c7 14 * limitations under the License.
MikamiUitOpen 4:c1beacfc42c7 15 */
MikamiUitOpen 4:c1beacfc42c7 16 #include "I2C.h"
MikamiUitOpen 4:c1beacfc42c7 17
MikamiUitOpen 4:c1beacfc42c7 18 #if DEVICE_I2C
MikamiUitOpen 4:c1beacfc42c7 19
MikamiUitOpen 4:c1beacfc42c7 20 namespace mbed {
MikamiUitOpen 4:c1beacfc42c7 21
MikamiUitOpen 4:c1beacfc42c7 22 I2C *I2C::_owner = NULL;
MikamiUitOpen 4:c1beacfc42c7 23
MikamiUitOpen 4:c1beacfc42c7 24 I2C::I2C(PinName sda, PinName scl) :
MikamiUitOpen 4:c1beacfc42c7 25 #if DEVICE_I2C_ASYNCH
MikamiUitOpen 4:c1beacfc42c7 26 _irq(this), _usage(DMA_USAGE_NEVER),
MikamiUitOpen 4:c1beacfc42c7 27 #endif
MikamiUitOpen 4:c1beacfc42c7 28 _i2c(), _hz(100000) {
MikamiUitOpen 4:c1beacfc42c7 29 // The init function also set the frequency to 100000
MikamiUitOpen 4:c1beacfc42c7 30 i2c_init(&_i2c, sda, scl);
MikamiUitOpen 4:c1beacfc42c7 31
MikamiUitOpen 4:c1beacfc42c7 32 // Used to avoid unnecessary frequency updates
MikamiUitOpen 4:c1beacfc42c7 33 _owner = this;
MikamiUitOpen 4:c1beacfc42c7 34 }
MikamiUitOpen 4:c1beacfc42c7 35
MikamiUitOpen 4:c1beacfc42c7 36 void I2C::frequency(int hz) {
MikamiUitOpen 4:c1beacfc42c7 37 _hz = hz;
MikamiUitOpen 4:c1beacfc42c7 38
MikamiUitOpen 4:c1beacfc42c7 39 // We want to update the frequency even if we are already the bus owners
MikamiUitOpen 4:c1beacfc42c7 40 i2c_frequency(&_i2c, _hz);
MikamiUitOpen 4:c1beacfc42c7 41
MikamiUitOpen 4:c1beacfc42c7 42 // Updating the frequency of the bus we become the owners of it
MikamiUitOpen 4:c1beacfc42c7 43 _owner = this;
MikamiUitOpen 4:c1beacfc42c7 44 }
MikamiUitOpen 4:c1beacfc42c7 45
MikamiUitOpen 4:c1beacfc42c7 46 void I2C::aquire() {
MikamiUitOpen 4:c1beacfc42c7 47 if (_owner != this) {
MikamiUitOpen 4:c1beacfc42c7 48 i2c_frequency(&_i2c, _hz);
MikamiUitOpen 4:c1beacfc42c7 49 _owner = this;
MikamiUitOpen 4:c1beacfc42c7 50 }
MikamiUitOpen 4:c1beacfc42c7 51 }
MikamiUitOpen 4:c1beacfc42c7 52
MikamiUitOpen 4:c1beacfc42c7 53 // write - Master Transmitter Mode
MikamiUitOpen 4:c1beacfc42c7 54 int I2C::write(int address, const char* data, int length, bool repeated) {
MikamiUitOpen 4:c1beacfc42c7 55 aquire();
MikamiUitOpen 4:c1beacfc42c7 56
MikamiUitOpen 4:c1beacfc42c7 57 int stop = (repeated) ? 0 : 1;
MikamiUitOpen 4:c1beacfc42c7 58 int written = i2c_write(&_i2c, address, data, length, stop);
MikamiUitOpen 4:c1beacfc42c7 59
MikamiUitOpen 4:c1beacfc42c7 60 return length != written;
MikamiUitOpen 4:c1beacfc42c7 61 }
MikamiUitOpen 4:c1beacfc42c7 62
MikamiUitOpen 4:c1beacfc42c7 63 int I2C::write(int data) {
MikamiUitOpen 4:c1beacfc42c7 64 return i2c_byte_write(&_i2c, data);
MikamiUitOpen 4:c1beacfc42c7 65 }
MikamiUitOpen 4:c1beacfc42c7 66
MikamiUitOpen 4:c1beacfc42c7 67 // read - Master Reciever Mode
MikamiUitOpen 4:c1beacfc42c7 68 int I2C::read(int address, char* data, int length, bool repeated) {
MikamiUitOpen 4:c1beacfc42c7 69 aquire();
MikamiUitOpen 4:c1beacfc42c7 70
MikamiUitOpen 4:c1beacfc42c7 71 int stop = (repeated) ? 0 : 1;
MikamiUitOpen 4:c1beacfc42c7 72 int read = i2c_read(&_i2c, address, data, length, stop);
MikamiUitOpen 4:c1beacfc42c7 73
MikamiUitOpen 4:c1beacfc42c7 74 return length != read;
MikamiUitOpen 4:c1beacfc42c7 75 }
MikamiUitOpen 4:c1beacfc42c7 76
MikamiUitOpen 4:c1beacfc42c7 77 int I2C::read(int ack) {
MikamiUitOpen 4:c1beacfc42c7 78 if (ack) {
MikamiUitOpen 4:c1beacfc42c7 79 return i2c_byte_read(&_i2c, 0);
MikamiUitOpen 4:c1beacfc42c7 80 } else {
MikamiUitOpen 4:c1beacfc42c7 81 return i2c_byte_read(&_i2c, 1);
MikamiUitOpen 4:c1beacfc42c7 82 }
MikamiUitOpen 4:c1beacfc42c7 83 }
MikamiUitOpen 4:c1beacfc42c7 84
MikamiUitOpen 4:c1beacfc42c7 85 void I2C::start(void) {
MikamiUitOpen 4:c1beacfc42c7 86 i2c_start(&_i2c);
MikamiUitOpen 4:c1beacfc42c7 87 }
MikamiUitOpen 4:c1beacfc42c7 88
MikamiUitOpen 4:c1beacfc42c7 89 void I2C::stop(void) {
MikamiUitOpen 4:c1beacfc42c7 90 i2c_stop(&_i2c);
MikamiUitOpen 4:c1beacfc42c7 91 }
MikamiUitOpen 4:c1beacfc42c7 92
MikamiUitOpen 4:c1beacfc42c7 93 #if DEVICE_I2C_ASYNCH
MikamiUitOpen 4:c1beacfc42c7 94
MikamiUitOpen 4:c1beacfc42c7 95 int I2C::transfer(int address, const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length, const event_callback_t& callback, int event, bool repeated)
MikamiUitOpen 4:c1beacfc42c7 96 {
MikamiUitOpen 4:c1beacfc42c7 97 if (i2c_active(&_i2c)) {
MikamiUitOpen 4:c1beacfc42c7 98 return -1; // transaction ongoing
MikamiUitOpen 4:c1beacfc42c7 99 }
MikamiUitOpen 4:c1beacfc42c7 100 aquire();
MikamiUitOpen 4:c1beacfc42c7 101
MikamiUitOpen 4:c1beacfc42c7 102 _callback = callback;
MikamiUitOpen 4:c1beacfc42c7 103 int stop = (repeated) ? 0 : 1;
MikamiUitOpen 4:c1beacfc42c7 104 _irq.callback(&I2C::irq_handler_asynch);
MikamiUitOpen 4:c1beacfc42c7 105 i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage);
MikamiUitOpen 4:c1beacfc42c7 106 return 0;
MikamiUitOpen 4:c1beacfc42c7 107 }
MikamiUitOpen 4:c1beacfc42c7 108
MikamiUitOpen 4:c1beacfc42c7 109 void I2C::abort_transfer(void)
MikamiUitOpen 4:c1beacfc42c7 110 {
MikamiUitOpen 4:c1beacfc42c7 111 i2c_abort_asynch(&_i2c);
MikamiUitOpen 4:c1beacfc42c7 112 }
MikamiUitOpen 4:c1beacfc42c7 113
MikamiUitOpen 4:c1beacfc42c7 114 void I2C::irq_handler_asynch(void)
MikamiUitOpen 4:c1beacfc42c7 115 {
MikamiUitOpen 4:c1beacfc42c7 116 int event = i2c_irq_handler_asynch(&_i2c);
MikamiUitOpen 4:c1beacfc42c7 117 if (_callback && event) {
MikamiUitOpen 4:c1beacfc42c7 118 _callback.call(event);
MikamiUitOpen 4:c1beacfc42c7 119 }
MikamiUitOpen 4:c1beacfc42c7 120
MikamiUitOpen 4:c1beacfc42c7 121 }
MikamiUitOpen 4:c1beacfc42c7 122
MikamiUitOpen 4:c1beacfc42c7 123
MikamiUitOpen 4:c1beacfc42c7 124 #endif
MikamiUitOpen 4:c1beacfc42c7 125
MikamiUitOpen 4:c1beacfc42c7 126 } // namespace mbed
MikamiUitOpen 4:c1beacfc42c7 127
MikamiUitOpen 4:c1beacfc42c7 128 #endif