PHung Tung / DISCO-F746_WAV_PLAYER

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Dependencies:   F746_GUI SD_PlayerSkeleton F746_SAI_IO

SRC_STM32F7/common/I2C.cpp@0:8ede47d38d10, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:37:21 2019 +0000
Revision:
0:8ede47d38d10
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phungductung 0:8ede47d38d10 1 /* mbed Microcontroller Library
phungductung 0:8ede47d38d10 2 * Copyright (c) 2006-2015 ARM Limited
phungductung 0:8ede47d38d10 3 *
phungductung 0:8ede47d38d10 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:8ede47d38d10 5 * you may not use this file except in compliance with the License.
phungductung 0:8ede47d38d10 6 * You may obtain a copy of the License at
phungductung 0:8ede47d38d10 7 *
phungductung 0:8ede47d38d10 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:8ede47d38d10 9 *
phungductung 0:8ede47d38d10 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:8ede47d38d10 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:8ede47d38d10 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:8ede47d38d10 13 * See the License for the specific language governing permissions and
phungductung 0:8ede47d38d10 14 * limitations under the License.
phungductung 0:8ede47d38d10 15 */
phungductung 0:8ede47d38d10 16 #include "I2C.h"
phungductung 0:8ede47d38d10 17
phungductung 0:8ede47d38d10 18 #if DEVICE_I2C
phungductung 0:8ede47d38d10 19
phungductung 0:8ede47d38d10 20 namespace mbed {
phungductung 0:8ede47d38d10 21
phungductung 0:8ede47d38d10 22 I2C *I2C::_owner = NULL;
phungductung 0:8ede47d38d10 23
phungductung 0:8ede47d38d10 24 I2C::I2C(PinName sda, PinName scl) :
phungductung 0:8ede47d38d10 25 #if DEVICE_I2C_ASYNCH
phungductung 0:8ede47d38d10 26 _irq(this), _usage(DMA_USAGE_NEVER),
phungductung 0:8ede47d38d10 27 #endif
phungductung 0:8ede47d38d10 28 _i2c(), _hz(100000) {
phungductung 0:8ede47d38d10 29 // The init function also set the frequency to 100000
phungductung 0:8ede47d38d10 30 i2c_init(&_i2c, sda, scl);
phungductung 0:8ede47d38d10 31
phungductung 0:8ede47d38d10 32 // Used to avoid unnecessary frequency updates
phungductung 0:8ede47d38d10 33 _owner = this;
phungductung 0:8ede47d38d10 34 }
phungductung 0:8ede47d38d10 35
phungductung 0:8ede47d38d10 36 void I2C::frequency(int hz) {
phungductung 0:8ede47d38d10 37 _hz = hz;
phungductung 0:8ede47d38d10 38
phungductung 0:8ede47d38d10 39 // We want to update the frequency even if we are already the bus owners
phungductung 0:8ede47d38d10 40 i2c_frequency(&_i2c, _hz);
phungductung 0:8ede47d38d10 41
phungductung 0:8ede47d38d10 42 // Updating the frequency of the bus we become the owners of it
phungductung 0:8ede47d38d10 43 _owner = this;
phungductung 0:8ede47d38d10 44 }
phungductung 0:8ede47d38d10 45
phungductung 0:8ede47d38d10 46 void I2C::aquire() {
phungductung 0:8ede47d38d10 47 if (_owner != this) {
phungductung 0:8ede47d38d10 48 i2c_frequency(&_i2c, _hz);
phungductung 0:8ede47d38d10 49 _owner = this;
phungductung 0:8ede47d38d10 50 }
phungductung 0:8ede47d38d10 51 }
phungductung 0:8ede47d38d10 52
phungductung 0:8ede47d38d10 53 // write - Master Transmitter Mode
phungductung 0:8ede47d38d10 54 int I2C::write(int address, const char* data, int length, bool repeated) {
phungductung 0:8ede47d38d10 55 aquire();
phungductung 0:8ede47d38d10 56
phungductung 0:8ede47d38d10 57 int stop = (repeated) ? 0 : 1;
phungductung 0:8ede47d38d10 58 int written = i2c_write(&_i2c, address, data, length, stop);
phungductung 0:8ede47d38d10 59
phungductung 0:8ede47d38d10 60 return length != written;
phungductung 0:8ede47d38d10 61 }
phungductung 0:8ede47d38d10 62
phungductung 0:8ede47d38d10 63 int I2C::write(int data) {
phungductung 0:8ede47d38d10 64 return i2c_byte_write(&_i2c, data);
phungductung 0:8ede47d38d10 65 }
phungductung 0:8ede47d38d10 66
phungductung 0:8ede47d38d10 67 // read - Master Reciever Mode
phungductung 0:8ede47d38d10 68 int I2C::read(int address, char* data, int length, bool repeated) {
phungductung 0:8ede47d38d10 69 aquire();
phungductung 0:8ede47d38d10 70
phungductung 0:8ede47d38d10 71 int stop = (repeated) ? 0 : 1;
phungductung 0:8ede47d38d10 72 int read = i2c_read(&_i2c, address, data, length, stop);
phungductung 0:8ede47d38d10 73
phungductung 0:8ede47d38d10 74 return length != read;
phungductung 0:8ede47d38d10 75 }
phungductung 0:8ede47d38d10 76
phungductung 0:8ede47d38d10 77 int I2C::read(int ack) {
phungductung 0:8ede47d38d10 78 if (ack) {
phungductung 0:8ede47d38d10 79 return i2c_byte_read(&_i2c, 0);
phungductung 0:8ede47d38d10 80 } else {
phungductung 0:8ede47d38d10 81 return i2c_byte_read(&_i2c, 1);
phungductung 0:8ede47d38d10 82 }
phungductung 0:8ede47d38d10 83 }
phungductung 0:8ede47d38d10 84
phungductung 0:8ede47d38d10 85 void I2C::start(void) {
phungductung 0:8ede47d38d10 86 i2c_start(&_i2c);
phungductung 0:8ede47d38d10 87 }
phungductung 0:8ede47d38d10 88
phungductung 0:8ede47d38d10 89 void I2C::stop(void) {
phungductung 0:8ede47d38d10 90 i2c_stop(&_i2c);
phungductung 0:8ede47d38d10 91 }
phungductung 0:8ede47d38d10 92
phungductung 0:8ede47d38d10 93 #if DEVICE_I2C_ASYNCH
phungductung 0:8ede47d38d10 94
phungductung 0:8ede47d38d10 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)
phungductung 0:8ede47d38d10 96 {
phungductung 0:8ede47d38d10 97 if (i2c_active(&_i2c)) {
phungductung 0:8ede47d38d10 98 return -1; // transaction ongoing
phungductung 0:8ede47d38d10 99 }
phungductung 0:8ede47d38d10 100 aquire();
phungductung 0:8ede47d38d10 101
phungductung 0:8ede47d38d10 102 _callback = callback;
phungductung 0:8ede47d38d10 103 int stop = (repeated) ? 0 : 1;
phungductung 0:8ede47d38d10 104 _irq.callback(&I2C::irq_handler_asynch);
phungductung 0:8ede47d38d10 105 i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage);
phungductung 0:8ede47d38d10 106 return 0;
phungductung 0:8ede47d38d10 107 }
phungductung 0:8ede47d38d10 108
phungductung 0:8ede47d38d10 109 void I2C::abort_transfer(void)
phungductung 0:8ede47d38d10 110 {
phungductung 0:8ede47d38d10 111 i2c_abort_asynch(&_i2c);
phungductung 0:8ede47d38d10 112 }
phungductung 0:8ede47d38d10 113
phungductung 0:8ede47d38d10 114 void I2C::irq_handler_asynch(void)
phungductung 0:8ede47d38d10 115 {
phungductung 0:8ede47d38d10 116 int event = i2c_irq_handler_asynch(&_i2c);
phungductung 0:8ede47d38d10 117 if (_callback && event) {
phungductung 0:8ede47d38d10 118 _callback.call(event);
phungductung 0:8ede47d38d10 119 }
phungductung 0:8ede47d38d10 120
phungductung 0:8ede47d38d10 121 }
phungductung 0:8ede47d38d10 122
phungductung 0:8ede47d38d10 123
phungductung 0:8ede47d38d10 124 #endif
phungductung 0:8ede47d38d10 125
phungductung 0:8ede47d38d10 126 } // namespace mbed
phungductung 0:8ede47d38d10 127
phungductung 0:8ede47d38d10 128 #endif