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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

common/I2C.cpp@9:0ce32e54c9a7, 2013-06-10 (annotated)

Committer:
emilmont
Date:
Mon Jun 10 16:03:00 2013 +0100
Revision:
9:0ce32e54c9a7
Parent:
cpp/I2C.cpp@2:143cac498751
Child:
10:3bc89ef62ce7
Refactoring of the mbed SDK:

- Provide a well defined HAL and API

- Keep separated the HAL implementations for the different targets

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:fd0d7bdfcdc2 1 /* mbed Microcontroller Library
emilmont 2:143cac498751 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 0:fd0d7bdfcdc2 3 *
emilmont 2:143cac498751 4 * Licensed under the Apache License, Version 2.0 (the "License");
emilmont 2:143cac498751 5 * you may not use this file except in compliance with the License.
emilmont 2:143cac498751 6 * You may obtain a copy of the License at
mbed_official 0:fd0d7bdfcdc2 7 *
emilmont 2:143cac498751 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 0:fd0d7bdfcdc2 9 *
emilmont 2:143cac498751 10 * Unless required by applicable law or agreed to in writing, software
emilmont 2:143cac498751 11 * distributed under the License is distributed on an "AS IS" BASIS,
emilmont 2:143cac498751 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
emilmont 2:143cac498751 13 * See the License for the specific language governing permissions and
emilmont 2:143cac498751 14 * limitations under the License.
mbed_official 0:fd0d7bdfcdc2 15 */
mbed_official 0:fd0d7bdfcdc2 16 #include "I2C.h"
mbed_official 0:fd0d7bdfcdc2 17
mbed_official 0:fd0d7bdfcdc2 18 #if DEVICE_I2C
mbed_official 0:fd0d7bdfcdc2 19
mbed_official 0:fd0d7bdfcdc2 20 namespace mbed {
mbed_official 0:fd0d7bdfcdc2 21
mbed_official 0:fd0d7bdfcdc2 22 I2C *I2C::_owner = NULL;
mbed_official 0:fd0d7bdfcdc2 23
mbed_official 0:fd0d7bdfcdc2 24 I2C::I2C(PinName sda, PinName scl) {
mbed_official 0:fd0d7bdfcdc2 25 // The init function also set the frequency to 100000
mbed_official 0:fd0d7bdfcdc2 26 i2c_init(&_i2c, sda, scl);
mbed_official 0:fd0d7bdfcdc2 27 _hz = 100000;
emilmont 2:143cac498751 28
mbed_official 0:fd0d7bdfcdc2 29 // Used to avoid unnecessary frequency updates
mbed_official 0:fd0d7bdfcdc2 30 _owner = this;
mbed_official 0:fd0d7bdfcdc2 31 }
mbed_official 0:fd0d7bdfcdc2 32
mbed_official 0:fd0d7bdfcdc2 33 void I2C::frequency(int hz) {
mbed_official 0:fd0d7bdfcdc2 34 _hz = hz;
emilmont 2:143cac498751 35
mbed_official 0:fd0d7bdfcdc2 36 // We want to update the frequency even if we are already the bus owners
mbed_official 0:fd0d7bdfcdc2 37 i2c_frequency(&_i2c, _hz);
emilmont 2:143cac498751 38
mbed_official 0:fd0d7bdfcdc2 39 // Updating the frequency of the bus we become the owners of it
mbed_official 0:fd0d7bdfcdc2 40 _owner = this;
mbed_official 0:fd0d7bdfcdc2 41 }
mbed_official 0:fd0d7bdfcdc2 42
mbed_official 0:fd0d7bdfcdc2 43 void I2C::aquire() {
mbed_official 0:fd0d7bdfcdc2 44 if (_owner != this) {
mbed_official 0:fd0d7bdfcdc2 45 i2c_frequency(&_i2c, _hz);
mbed_official 0:fd0d7bdfcdc2 46 _owner = this;
mbed_official 0:fd0d7bdfcdc2 47 }
mbed_official 0:fd0d7bdfcdc2 48 }
mbed_official 0:fd0d7bdfcdc2 49
mbed_official 0:fd0d7bdfcdc2 50 // write - Master Transmitter Mode
mbed_official 0:fd0d7bdfcdc2 51 int I2C::write(int address, const char* data, int length, bool repeated) {
emilmont 2:143cac498751 52 aquire();
emilmont 2:143cac498751 53
mbed_official 0:fd0d7bdfcdc2 54 int stop = (repeated) ? 0 : 1;
mbed_official 0:fd0d7bdfcdc2 55 int retval = i2c_write(&_i2c, address, data, length, stop);
emilmont 2:143cac498751 56
mbed_official 0:fd0d7bdfcdc2 57 return retval;
mbed_official 0:fd0d7bdfcdc2 58 }
mbed_official 0:fd0d7bdfcdc2 59
mbed_official 0:fd0d7bdfcdc2 60 int I2C::write(int data) {
mbed_official 0:fd0d7bdfcdc2 61 return i2c_byte_write(&_i2c, data);
mbed_official 0:fd0d7bdfcdc2 62 }
mbed_official 0:fd0d7bdfcdc2 63
mbed_official 0:fd0d7bdfcdc2 64 // read - Master Reciever Mode
mbed_official 0:fd0d7bdfcdc2 65 int I2C::read(int address, char* data, int length, bool repeated) {
mbed_official 0:fd0d7bdfcdc2 66 aquire();
emilmont 2:143cac498751 67
mbed_official 0:fd0d7bdfcdc2 68 int stop = (repeated) ? 0 : 1;
mbed_official 0:fd0d7bdfcdc2 69 int retval = i2c_read(&_i2c, address, data, length, stop);
emilmont 2:143cac498751 70
mbed_official 0:fd0d7bdfcdc2 71 return retval;
mbed_official 0:fd0d7bdfcdc2 72 }
mbed_official 0:fd0d7bdfcdc2 73
mbed_official 0:fd0d7bdfcdc2 74 int I2C::read(int ack) {
mbed_official 0:fd0d7bdfcdc2 75 if (ack) {
mbed_official 0:fd0d7bdfcdc2 76 return i2c_byte_read(&_i2c, 0);
mbed_official 0:fd0d7bdfcdc2 77 } else {
mbed_official 0:fd0d7bdfcdc2 78 return i2c_byte_read(&_i2c, 1);
mbed_official 0:fd0d7bdfcdc2 79 }
mbed_official 0:fd0d7bdfcdc2 80 }
mbed_official 0:fd0d7bdfcdc2 81
mbed_official 0:fd0d7bdfcdc2 82 void I2C::start(void) {
mbed_official 0:fd0d7bdfcdc2 83 i2c_start(&_i2c);
mbed_official 0:fd0d7bdfcdc2 84 }
mbed_official 0:fd0d7bdfcdc2 85
mbed_official 0:fd0d7bdfcdc2 86 void I2C::stop(void) {
mbed_official 0:fd0d7bdfcdc2 87 i2c_stop(&_i2c);
mbed_official 0:fd0d7bdfcdc2 88 }
mbed_official 0:fd0d7bdfcdc2 89
mbed_official 0:fd0d7bdfcdc2 90 } // namespace mbed
mbed_official 0:fd0d7bdfcdc2 91
mbed_official 0:fd0d7bdfcdc2 92 #endif