Tamura Mizuki / STM32F746_FFT

fft

Dependencies:   BSP_DISCO_F746NG SDFileSystem_Warning_Fixed

mbed_src_STM32F7/common/I2C.cpp@0:3e46577dc273, 2016-10-09 (annotated)

Committer:
MikamiUitOpen
Date:
Sun Oct 09 10:11:14 2016 +0000
Revision:
0:3e46577dc273
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:3e46577dc273 1 /* mbed Microcontroller Library
MikamiUitOpen 0:3e46577dc273 2 * Copyright (c) 2006-2015 ARM Limited
MikamiUitOpen 0:3e46577dc273 3 *
MikamiUitOpen 0:3e46577dc273 4 * Licensed under the Apache License, Version 2.0 (the "License");
MikamiUitOpen 0:3e46577dc273 5 * you may not use this file except in compliance with the License.
MikamiUitOpen 0:3e46577dc273 6 * You may obtain a copy of the License at
MikamiUitOpen 0:3e46577dc273 7 *
MikamiUitOpen 0:3e46577dc273 8 * http://www.apache.org/licenses/LICENSE-2.0
MikamiUitOpen 0:3e46577dc273 9 *
MikamiUitOpen 0:3e46577dc273 10 * Unless required by applicable law or agreed to in writing, software
MikamiUitOpen 0:3e46577dc273 11 * distributed under the License is distributed on an "AS IS" BASIS,
MikamiUitOpen 0:3e46577dc273 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
MikamiUitOpen 0:3e46577dc273 13 * See the License for the specific language governing permissions and
MikamiUitOpen 0:3e46577dc273 14 * limitations under the License.
MikamiUitOpen 0:3e46577dc273 15 */
MikamiUitOpen 0:3e46577dc273 16 #include "I2C.h"
MikamiUitOpen 0:3e46577dc273 17
MikamiUitOpen 0:3e46577dc273 18 #if DEVICE_I2C
MikamiUitOpen 0:3e46577dc273 19
MikamiUitOpen 0:3e46577dc273 20 namespace mbed {
MikamiUitOpen 0:3e46577dc273 21
MikamiUitOpen 0:3e46577dc273 22 I2C *I2C::_owner = NULL;
MikamiUitOpen 0:3e46577dc273 23
MikamiUitOpen 0:3e46577dc273 24 I2C::I2C(PinName sda, PinName scl) :
MikamiUitOpen 0:3e46577dc273 25 #if DEVICE_I2C_ASYNCH
MikamiUitOpen 0:3e46577dc273 26 _irq(this), _usage(DMA_USAGE_NEVER),
MikamiUitOpen 0:3e46577dc273 27 #endif
MikamiUitOpen 0:3e46577dc273 28 _i2c(), _hz(100000) {
MikamiUitOpen 0:3e46577dc273 29 // The init function also set the frequency to 100000
MikamiUitOpen 0:3e46577dc273 30 i2c_init(&_i2c, sda, scl);
MikamiUitOpen 0:3e46577dc273 31
MikamiUitOpen 0:3e46577dc273 32 // Used to avoid unnecessary frequency updates
MikamiUitOpen 0:3e46577dc273 33 _owner = this;
MikamiUitOpen 0:3e46577dc273 34 }
MikamiUitOpen 0:3e46577dc273 35
MikamiUitOpen 0:3e46577dc273 36 void I2C::frequency(int hz) {
MikamiUitOpen 0:3e46577dc273 37 _hz = hz;
MikamiUitOpen 0:3e46577dc273 38
MikamiUitOpen 0:3e46577dc273 39 // We want to update the frequency even if we are already the bus owners
MikamiUitOpen 0:3e46577dc273 40 i2c_frequency(&_i2c, _hz);
MikamiUitOpen 0:3e46577dc273 41
MikamiUitOpen 0:3e46577dc273 42 // Updating the frequency of the bus we become the owners of it
MikamiUitOpen 0:3e46577dc273 43 _owner = this;
MikamiUitOpen 0:3e46577dc273 44 }
MikamiUitOpen 0:3e46577dc273 45
MikamiUitOpen 0:3e46577dc273 46 void I2C::aquire() {
MikamiUitOpen 0:3e46577dc273 47 if (_owner != this) {
MikamiUitOpen 0:3e46577dc273 48 i2c_frequency(&_i2c, _hz);
MikamiUitOpen 0:3e46577dc273 49 _owner = this;
MikamiUitOpen 0:3e46577dc273 50 }
MikamiUitOpen 0:3e46577dc273 51 }
MikamiUitOpen 0:3e46577dc273 52
MikamiUitOpen 0:3e46577dc273 53 // write - Master Transmitter Mode
MikamiUitOpen 0:3e46577dc273 54 int I2C::write(int address, const char* data, int length, bool repeated) {
MikamiUitOpen 0:3e46577dc273 55 aquire();
MikamiUitOpen 0:3e46577dc273 56
MikamiUitOpen 0:3e46577dc273 57 int stop = (repeated) ? 0 : 1;
MikamiUitOpen 0:3e46577dc273 58 int written = i2c_write(&_i2c, address, data, length, stop);
MikamiUitOpen 0:3e46577dc273 59
MikamiUitOpen 0:3e46577dc273 60 return length != written;
MikamiUitOpen 0:3e46577dc273 61 }
MikamiUitOpen 0:3e46577dc273 62
MikamiUitOpen 0:3e46577dc273 63 int I2C::write(int data) {
MikamiUitOpen 0:3e46577dc273 64 return i2c_byte_write(&_i2c, data);
MikamiUitOpen 0:3e46577dc273 65 }
MikamiUitOpen 0:3e46577dc273 66
MikamiUitOpen 0:3e46577dc273 67 // read - Master Reciever Mode
MikamiUitOpen 0:3e46577dc273 68 int I2C::read(int address, char* data, int length, bool repeated) {
MikamiUitOpen 0:3e46577dc273 69 aquire();
MikamiUitOpen 0:3e46577dc273 70
MikamiUitOpen 0:3e46577dc273 71 int stop = (repeated) ? 0 : 1;
MikamiUitOpen 0:3e46577dc273 72 int read = i2c_read(&_i2c, address, data, length, stop);
MikamiUitOpen 0:3e46577dc273 73
MikamiUitOpen 0:3e46577dc273 74 return length != read;
MikamiUitOpen 0:3e46577dc273 75 }
MikamiUitOpen 0:3e46577dc273 76
MikamiUitOpen 0:3e46577dc273 77 int I2C::read(int ack) {
MikamiUitOpen 0:3e46577dc273 78 if (ack) {
MikamiUitOpen 0:3e46577dc273 79 return i2c_byte_read(&_i2c, 0);
MikamiUitOpen 0:3e46577dc273 80 } else {
MikamiUitOpen 0:3e46577dc273 81 return i2c_byte_read(&_i2c, 1);
MikamiUitOpen 0:3e46577dc273 82 }
MikamiUitOpen 0:3e46577dc273 83 }
MikamiUitOpen 0:3e46577dc273 84
MikamiUitOpen 0:3e46577dc273 85 void I2C::start(void) {
MikamiUitOpen 0:3e46577dc273 86 i2c_start(&_i2c);
MikamiUitOpen 0:3e46577dc273 87 }
MikamiUitOpen 0:3e46577dc273 88
MikamiUitOpen 0:3e46577dc273 89 void I2C::stop(void) {
MikamiUitOpen 0:3e46577dc273 90 i2c_stop(&_i2c);
MikamiUitOpen 0:3e46577dc273 91 }
MikamiUitOpen 0:3e46577dc273 92
MikamiUitOpen 0:3e46577dc273 93 #if DEVICE_I2C_ASYNCH
MikamiUitOpen 0:3e46577dc273 94
MikamiUitOpen 0:3e46577dc273 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 0:3e46577dc273 96 {
MikamiUitOpen 0:3e46577dc273 97 if (i2c_active(&_i2c)) {
MikamiUitOpen 0:3e46577dc273 98 return -1; // transaction ongoing
MikamiUitOpen 0:3e46577dc273 99 }
MikamiUitOpen 0:3e46577dc273 100 aquire();
MikamiUitOpen 0:3e46577dc273 101
MikamiUitOpen 0:3e46577dc273 102 _callback = callback;
MikamiUitOpen 0:3e46577dc273 103 int stop = (repeated) ? 0 : 1;
MikamiUitOpen 0:3e46577dc273 104 _irq.callback(&I2C::irq_handler_asynch);
MikamiUitOpen 0:3e46577dc273 105 i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage);
MikamiUitOpen 0:3e46577dc273 106 return 0;
MikamiUitOpen 0:3e46577dc273 107 }
MikamiUitOpen 0:3e46577dc273 108
MikamiUitOpen 0:3e46577dc273 109 void I2C::abort_transfer(void)
MikamiUitOpen 0:3e46577dc273 110 {
MikamiUitOpen 0:3e46577dc273 111 i2c_abort_asynch(&_i2c);
MikamiUitOpen 0:3e46577dc273 112 }
MikamiUitOpen 0:3e46577dc273 113
MikamiUitOpen 0:3e46577dc273 114 void I2C::irq_handler_asynch(void)
MikamiUitOpen 0:3e46577dc273 115 {
MikamiUitOpen 0:3e46577dc273 116 int event = i2c_irq_handler_asynch(&_i2c);
MikamiUitOpen 0:3e46577dc273 117 if (_callback && event) {
MikamiUitOpen 0:3e46577dc273 118 _callback.call(event);
MikamiUitOpen 0:3e46577dc273 119 }
MikamiUitOpen 0:3e46577dc273 120
MikamiUitOpen 0:3e46577dc273 121 }
MikamiUitOpen 0:3e46577dc273 122
MikamiUitOpen 0:3e46577dc273 123
MikamiUitOpen 0:3e46577dc273 124 #endif
MikamiUitOpen 0:3e46577dc273 125
MikamiUitOpen 0:3e46577dc273 126 } // namespace mbed
MikamiUitOpen 0:3e46577dc273 127
MikamiUitOpen 0:3e46577dc273 128 #endif