PHung Tung / SRC_STM32F7

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common/I2C.cpp@0:e87aa4c49e95, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:51:46 2019 +0000
Revision:
0:e87aa4c49e95
libray

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phungductung 0:e87aa4c49e95 1 /* mbed Microcontroller Library
phungductung 0:e87aa4c49e95 2 * Copyright (c) 2006-2015 ARM Limited
phungductung 0:e87aa4c49e95 3 *
phungductung 0:e87aa4c49e95 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:e87aa4c49e95 5 * you may not use this file except in compliance with the License.
phungductung 0:e87aa4c49e95 6 * You may obtain a copy of the License at
phungductung 0:e87aa4c49e95 7 *
phungductung 0:e87aa4c49e95 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:e87aa4c49e95 9 *
phungductung 0:e87aa4c49e95 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:e87aa4c49e95 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:e87aa4c49e95 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:e87aa4c49e95 13 * See the License for the specific language governing permissions and
phungductung 0:e87aa4c49e95 14 * limitations under the License.
phungductung 0:e87aa4c49e95 15 */
phungductung 0:e87aa4c49e95 16 #include "I2C.h"
phungductung 0:e87aa4c49e95 17
phungductung 0:e87aa4c49e95 18 #if DEVICE_I2C
phungductung 0:e87aa4c49e95 19
phungductung 0:e87aa4c49e95 20 namespace mbed {
phungductung 0:e87aa4c49e95 21
phungductung 0:e87aa4c49e95 22 I2C *I2C::_owner = NULL;
phungductung 0:e87aa4c49e95 23
phungductung 0:e87aa4c49e95 24 I2C::I2C(PinName sda, PinName scl) :
phungductung 0:e87aa4c49e95 25 #if DEVICE_I2C_ASYNCH
phungductung 0:e87aa4c49e95 26 _irq(this), _usage(DMA_USAGE_NEVER),
phungductung 0:e87aa4c49e95 27 #endif
phungductung 0:e87aa4c49e95 28 _i2c(), _hz(100000) {
phungductung 0:e87aa4c49e95 29 // The init function also set the frequency to 100000
phungductung 0:e87aa4c49e95 30 i2c_init(&_i2c, sda, scl);
phungductung 0:e87aa4c49e95 31
phungductung 0:e87aa4c49e95 32 // Used to avoid unnecessary frequency updates
phungductung 0:e87aa4c49e95 33 _owner = this;
phungductung 0:e87aa4c49e95 34 }
phungductung 0:e87aa4c49e95 35
phungductung 0:e87aa4c49e95 36 void I2C::frequency(int hz) {
phungductung 0:e87aa4c49e95 37 _hz = hz;
phungductung 0:e87aa4c49e95 38
phungductung 0:e87aa4c49e95 39 // We want to update the frequency even if we are already the bus owners
phungductung 0:e87aa4c49e95 40 i2c_frequency(&_i2c, _hz);
phungductung 0:e87aa4c49e95 41
phungductung 0:e87aa4c49e95 42 // Updating the frequency of the bus we become the owners of it
phungductung 0:e87aa4c49e95 43 _owner = this;
phungductung 0:e87aa4c49e95 44 }
phungductung 0:e87aa4c49e95 45
phungductung 0:e87aa4c49e95 46 void I2C::aquire() {
phungductung 0:e87aa4c49e95 47 if (_owner != this) {
phungductung 0:e87aa4c49e95 48 i2c_frequency(&_i2c, _hz);
phungductung 0:e87aa4c49e95 49 _owner = this;
phungductung 0:e87aa4c49e95 50 }
phungductung 0:e87aa4c49e95 51 }
phungductung 0:e87aa4c49e95 52
phungductung 0:e87aa4c49e95 53 // write - Master Transmitter Mode
phungductung 0:e87aa4c49e95 54 int I2C::write(int address, const char* data, int length, bool repeated) {
phungductung 0:e87aa4c49e95 55 aquire();
phungductung 0:e87aa4c49e95 56
phungductung 0:e87aa4c49e95 57 int stop = (repeated) ? 0 : 1;
phungductung 0:e87aa4c49e95 58 int written = i2c_write(&_i2c, address, data, length, stop);
phungductung 0:e87aa4c49e95 59
phungductung 0:e87aa4c49e95 60 return length != written;
phungductung 0:e87aa4c49e95 61 }
phungductung 0:e87aa4c49e95 62
phungductung 0:e87aa4c49e95 63 int I2C::write(int data) {
phungductung 0:e87aa4c49e95 64 return i2c_byte_write(&_i2c, data);
phungductung 0:e87aa4c49e95 65 }
phungductung 0:e87aa4c49e95 66
phungductung 0:e87aa4c49e95 67 // read - Master Reciever Mode
phungductung 0:e87aa4c49e95 68 int I2C::read(int address, char* data, int length, bool repeated) {
phungductung 0:e87aa4c49e95 69 aquire();
phungductung 0:e87aa4c49e95 70
phungductung 0:e87aa4c49e95 71 int stop = (repeated) ? 0 : 1;
phungductung 0:e87aa4c49e95 72 int read = i2c_read(&_i2c, address, data, length, stop);
phungductung 0:e87aa4c49e95 73
phungductung 0:e87aa4c49e95 74 return length != read;
phungductung 0:e87aa4c49e95 75 }
phungductung 0:e87aa4c49e95 76
phungductung 0:e87aa4c49e95 77 int I2C::read(int ack) {
phungductung 0:e87aa4c49e95 78 if (ack) {
phungductung 0:e87aa4c49e95 79 return i2c_byte_read(&_i2c, 0);
phungductung 0:e87aa4c49e95 80 } else {
phungductung 0:e87aa4c49e95 81 return i2c_byte_read(&_i2c, 1);
phungductung 0:e87aa4c49e95 82 }
phungductung 0:e87aa4c49e95 83 }
phungductung 0:e87aa4c49e95 84
phungductung 0:e87aa4c49e95 85 void I2C::start(void) {
phungductung 0:e87aa4c49e95 86 i2c_start(&_i2c);
phungductung 0:e87aa4c49e95 87 }
phungductung 0:e87aa4c49e95 88
phungductung 0:e87aa4c49e95 89 void I2C::stop(void) {
phungductung 0:e87aa4c49e95 90 i2c_stop(&_i2c);
phungductung 0:e87aa4c49e95 91 }
phungductung 0:e87aa4c49e95 92
phungductung 0:e87aa4c49e95 93 #if DEVICE_I2C_ASYNCH
phungductung 0:e87aa4c49e95 94
phungductung 0:e87aa4c49e95 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:e87aa4c49e95 96 {
phungductung 0:e87aa4c49e95 97 if (i2c_active(&_i2c)) {
phungductung 0:e87aa4c49e95 98 return -1; // transaction ongoing
phungductung 0:e87aa4c49e95 99 }
phungductung 0:e87aa4c49e95 100 aquire();
phungductung 0:e87aa4c49e95 101
phungductung 0:e87aa4c49e95 102 _callback = callback;
phungductung 0:e87aa4c49e95 103 int stop = (repeated) ? 0 : 1;
phungductung 0:e87aa4c49e95 104 _irq.callback(&I2C::irq_handler_asynch);
phungductung 0:e87aa4c49e95 105 i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage);
phungductung 0:e87aa4c49e95 106 return 0;
phungductung 0:e87aa4c49e95 107 }
phungductung 0:e87aa4c49e95 108
phungductung 0:e87aa4c49e95 109 void I2C::abort_transfer(void)
phungductung 0:e87aa4c49e95 110 {
phungductung 0:e87aa4c49e95 111 i2c_abort_asynch(&_i2c);
phungductung 0:e87aa4c49e95 112 }
phungductung 0:e87aa4c49e95 113
phungductung 0:e87aa4c49e95 114 void I2C::irq_handler_asynch(void)
phungductung 0:e87aa4c49e95 115 {
phungductung 0:e87aa4c49e95 116 int event = i2c_irq_handler_asynch(&_i2c);
phungductung 0:e87aa4c49e95 117 if (_callback && event) {
phungductung 0:e87aa4c49e95 118 _callback.call(event);
phungductung 0:e87aa4c49e95 119 }
phungductung 0:e87aa4c49e95 120
phungductung 0:e87aa4c49e95 121 }
phungductung 0:e87aa4c49e95 122
phungductung 0:e87aa4c49e95 123
phungductung 0:e87aa4c49e95 124 #endif
phungductung 0:e87aa4c49e95 125
phungductung 0:e87aa4c49e95 126 } // namespace mbed
phungductung 0:e87aa4c49e95 127
phungductung 0:e87aa4c49e95 128 #endif