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Dependencies:   F746_GUI SD_PlayerSkeleton F746_SAI_IO

mbed_src_STM32F7/common/I2C.cpp@0:aa3fc5ad02f7, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 09:08:29 2019 +0000
Revision:
0:aa3fc5ad02f7
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phungductung 0:aa3fc5ad02f7 1 /* mbed Microcontroller Library
phungductung 0:aa3fc5ad02f7 2 * Copyright (c) 2006-2015 ARM Limited
phungductung 0:aa3fc5ad02f7 3 *
phungductung 0:aa3fc5ad02f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:aa3fc5ad02f7 5 * you may not use this file except in compliance with the License.
phungductung 0:aa3fc5ad02f7 6 * You may obtain a copy of the License at
phungductung 0:aa3fc5ad02f7 7 *
phungductung 0:aa3fc5ad02f7 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:aa3fc5ad02f7 9 *
phungductung 0:aa3fc5ad02f7 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:aa3fc5ad02f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:aa3fc5ad02f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:aa3fc5ad02f7 13 * See the License for the specific language governing permissions and
phungductung 0:aa3fc5ad02f7 14 * limitations under the License.
phungductung 0:aa3fc5ad02f7 15 */
phungductung 0:aa3fc5ad02f7 16 #include "I2C.h"
phungductung 0:aa3fc5ad02f7 17
phungductung 0:aa3fc5ad02f7 18 #if DEVICE_I2C
phungductung 0:aa3fc5ad02f7 19
phungductung 0:aa3fc5ad02f7 20 namespace mbed {
phungductung 0:aa3fc5ad02f7 21
phungductung 0:aa3fc5ad02f7 22 I2C *I2C::_owner = NULL;
phungductung 0:aa3fc5ad02f7 23
phungductung 0:aa3fc5ad02f7 24 I2C::I2C(PinName sda, PinName scl) :
phungductung 0:aa3fc5ad02f7 25 #if DEVICE_I2C_ASYNCH
phungductung 0:aa3fc5ad02f7 26 _irq(this), _usage(DMA_USAGE_NEVER),
phungductung 0:aa3fc5ad02f7 27 #endif
phungductung 0:aa3fc5ad02f7 28 _i2c(), _hz(100000) {
phungductung 0:aa3fc5ad02f7 29 // The init function also set the frequency to 100000
phungductung 0:aa3fc5ad02f7 30 i2c_init(&_i2c, sda, scl);
phungductung 0:aa3fc5ad02f7 31
phungductung 0:aa3fc5ad02f7 32 // Used to avoid unnecessary frequency updates
phungductung 0:aa3fc5ad02f7 33 _owner = this;
phungductung 0:aa3fc5ad02f7 34 }
phungductung 0:aa3fc5ad02f7 35
phungductung 0:aa3fc5ad02f7 36 void I2C::frequency(int hz) {
phungductung 0:aa3fc5ad02f7 37 _hz = hz;
phungductung 0:aa3fc5ad02f7 38
phungductung 0:aa3fc5ad02f7 39 // We want to update the frequency even if we are already the bus owners
phungductung 0:aa3fc5ad02f7 40 i2c_frequency(&_i2c, _hz);
phungductung 0:aa3fc5ad02f7 41
phungductung 0:aa3fc5ad02f7 42 // Updating the frequency of the bus we become the owners of it
phungductung 0:aa3fc5ad02f7 43 _owner = this;
phungductung 0:aa3fc5ad02f7 44 }
phungductung 0:aa3fc5ad02f7 45
phungductung 0:aa3fc5ad02f7 46 void I2C::aquire() {
phungductung 0:aa3fc5ad02f7 47 if (_owner != this) {
phungductung 0:aa3fc5ad02f7 48 i2c_frequency(&_i2c, _hz);
phungductung 0:aa3fc5ad02f7 49 _owner = this;
phungductung 0:aa3fc5ad02f7 50 }
phungductung 0:aa3fc5ad02f7 51 }
phungductung 0:aa3fc5ad02f7 52
phungductung 0:aa3fc5ad02f7 53 // write - Master Transmitter Mode
phungductung 0:aa3fc5ad02f7 54 int I2C::write(int address, const char* data, int length, bool repeated) {
phungductung 0:aa3fc5ad02f7 55 aquire();
phungductung 0:aa3fc5ad02f7 56
phungductung 0:aa3fc5ad02f7 57 int stop = (repeated) ? 0 : 1;
phungductung 0:aa3fc5ad02f7 58 int written = i2c_write(&_i2c, address, data, length, stop);
phungductung 0:aa3fc5ad02f7 59
phungductung 0:aa3fc5ad02f7 60 return length != written;
phungductung 0:aa3fc5ad02f7 61 }
phungductung 0:aa3fc5ad02f7 62
phungductung 0:aa3fc5ad02f7 63 int I2C::write(int data) {
phungductung 0:aa3fc5ad02f7 64 return i2c_byte_write(&_i2c, data);
phungductung 0:aa3fc5ad02f7 65 }
phungductung 0:aa3fc5ad02f7 66
phungductung 0:aa3fc5ad02f7 67 // read - Master Reciever Mode
phungductung 0:aa3fc5ad02f7 68 int I2C::read(int address, char* data, int length, bool repeated) {
phungductung 0:aa3fc5ad02f7 69 aquire();
phungductung 0:aa3fc5ad02f7 70
phungductung 0:aa3fc5ad02f7 71 int stop = (repeated) ? 0 : 1;
phungductung 0:aa3fc5ad02f7 72 int read = i2c_read(&_i2c, address, data, length, stop);
phungductung 0:aa3fc5ad02f7 73
phungductung 0:aa3fc5ad02f7 74 return length != read;
phungductung 0:aa3fc5ad02f7 75 }
phungductung 0:aa3fc5ad02f7 76
phungductung 0:aa3fc5ad02f7 77 int I2C::read(int ack) {
phungductung 0:aa3fc5ad02f7 78 if (ack) {
phungductung 0:aa3fc5ad02f7 79 return i2c_byte_read(&_i2c, 0);
phungductung 0:aa3fc5ad02f7 80 } else {
phungductung 0:aa3fc5ad02f7 81 return i2c_byte_read(&_i2c, 1);
phungductung 0:aa3fc5ad02f7 82 }
phungductung 0:aa3fc5ad02f7 83 }
phungductung 0:aa3fc5ad02f7 84
phungductung 0:aa3fc5ad02f7 85 void I2C::start(void) {
phungductung 0:aa3fc5ad02f7 86 i2c_start(&_i2c);
phungductung 0:aa3fc5ad02f7 87 }
phungductung 0:aa3fc5ad02f7 88
phungductung 0:aa3fc5ad02f7 89 void I2C::stop(void) {
phungductung 0:aa3fc5ad02f7 90 i2c_stop(&_i2c);
phungductung 0:aa3fc5ad02f7 91 }
phungductung 0:aa3fc5ad02f7 92
phungductung 0:aa3fc5ad02f7 93 #if DEVICE_I2C_ASYNCH
phungductung 0:aa3fc5ad02f7 94
phungductung 0:aa3fc5ad02f7 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:aa3fc5ad02f7 96 {
phungductung 0:aa3fc5ad02f7 97 if (i2c_active(&_i2c)) {
phungductung 0:aa3fc5ad02f7 98 return -1; // transaction ongoing
phungductung 0:aa3fc5ad02f7 99 }
phungductung 0:aa3fc5ad02f7 100 aquire();
phungductung 0:aa3fc5ad02f7 101
phungductung 0:aa3fc5ad02f7 102 _callback = callback;
phungductung 0:aa3fc5ad02f7 103 int stop = (repeated) ? 0 : 1;
phungductung 0:aa3fc5ad02f7 104 _irq.callback(&I2C::irq_handler_asynch);
phungductung 0:aa3fc5ad02f7 105 i2c_transfer_asynch(&_i2c, (void *)tx_buffer, tx_length, (void *)rx_buffer, rx_length, address, stop, _irq.entry(), event, _usage);
phungductung 0:aa3fc5ad02f7 106 return 0;
phungductung 0:aa3fc5ad02f7 107 }
phungductung 0:aa3fc5ad02f7 108
phungductung 0:aa3fc5ad02f7 109 void I2C::abort_transfer(void)
phungductung 0:aa3fc5ad02f7 110 {
phungductung 0:aa3fc5ad02f7 111 i2c_abort_asynch(&_i2c);
phungductung 0:aa3fc5ad02f7 112 }
phungductung 0:aa3fc5ad02f7 113
phungductung 0:aa3fc5ad02f7 114 void I2C::irq_handler_asynch(void)
phungductung 0:aa3fc5ad02f7 115 {
phungductung 0:aa3fc5ad02f7 116 int event = i2c_irq_handler_asynch(&_i2c);
phungductung 0:aa3fc5ad02f7 117 if (_callback && event) {
phungductung 0:aa3fc5ad02f7 118 _callback.call(event);
phungductung 0:aa3fc5ad02f7 119 }
phungductung 0:aa3fc5ad02f7 120
phungductung 0:aa3fc5ad02f7 121 }
phungductung 0:aa3fc5ad02f7 122
phungductung 0:aa3fc5ad02f7 123
phungductung 0:aa3fc5ad02f7 124 #endif
phungductung 0:aa3fc5ad02f7 125
phungductung 0:aa3fc5ad02f7 126 } // namespace mbed
phungductung 0:aa3fc5ad02f7 127
phungductung 0:aa3fc5ad02f7 128 #endif