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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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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@212:34d62c0b2af6, 2014-05-26 (annotated)

Committer:
mbed_official
Date:
Mon May 26 18:15:07 2014 +0100
Revision:
212:34d62c0b2af6
Parent:
13:0645d8841f51
Child:
525:c320967f86b9
Synchronized with git revision f65b7d907785089e8dd942446f1c974b3a213a39



Full URL: https://github.com/mbedmicro/mbed/commit/f65b7d907785089e8dd942446f1c974b3a213a39/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 13:0645d8841f51 1 /* mbed Microcontroller Library
bogdanm 13:0645d8841f51 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 13:0645d8841f51 3 *
bogdanm 13:0645d8841f51 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 13:0645d8841f51 5 * you may not use this file except in compliance with the License.
bogdanm 13:0645d8841f51 6 * You may obtain a copy of the License at
bogdanm 13:0645d8841f51 7 *
bogdanm 13:0645d8841f51 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 13:0645d8841f51 9 *
bogdanm 13:0645d8841f51 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 13:0645d8841f51 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 13:0645d8841f51 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 13:0645d8841f51 13 * See the License for the specific language governing permissions and
bogdanm 13:0645d8841f51 14 * limitations under the License.
bogdanm 13:0645d8841f51 15 */
bogdanm 13:0645d8841f51 16 #include "I2C.h"
bogdanm 13:0645d8841f51 17
bogdanm 13:0645d8841f51 18 #if DEVICE_I2C
bogdanm 13:0645d8841f51 19
bogdanm 13:0645d8841f51 20 namespace mbed {
bogdanm 13:0645d8841f51 21
bogdanm 13:0645d8841f51 22 I2C *I2C::_owner = NULL;
bogdanm 13:0645d8841f51 23
mbed_official 212:34d62c0b2af6 24 I2C::I2C(PinName sda, PinName scl) : _i2c(), _hz(100000) {
bogdanm 13:0645d8841f51 25 // The init function also set the frequency to 100000
bogdanm 13:0645d8841f51 26 i2c_init(&_i2c, sda, scl);
bogdanm 13:0645d8841f51 27
bogdanm 13:0645d8841f51 28 // Used to avoid unnecessary frequency updates
bogdanm 13:0645d8841f51 29 _owner = this;
bogdanm 13:0645d8841f51 30 }
bogdanm 13:0645d8841f51 31
bogdanm 13:0645d8841f51 32 void I2C::frequency(int hz) {
bogdanm 13:0645d8841f51 33 _hz = hz;
bogdanm 13:0645d8841f51 34
bogdanm 13:0645d8841f51 35 // We want to update the frequency even if we are already the bus owners
bogdanm 13:0645d8841f51 36 i2c_frequency(&_i2c, _hz);
bogdanm 13:0645d8841f51 37
bogdanm 13:0645d8841f51 38 // Updating the frequency of the bus we become the owners of it
bogdanm 13:0645d8841f51 39 _owner = this;
bogdanm 13:0645d8841f51 40 }
bogdanm 13:0645d8841f51 41
bogdanm 13:0645d8841f51 42 void I2C::aquire() {
bogdanm 13:0645d8841f51 43 if (_owner != this) {
bogdanm 13:0645d8841f51 44 i2c_frequency(&_i2c, _hz);
bogdanm 13:0645d8841f51 45 _owner = this;
bogdanm 13:0645d8841f51 46 }
bogdanm 13:0645d8841f51 47 }
bogdanm 13:0645d8841f51 48
bogdanm 13:0645d8841f51 49 // write - Master Transmitter Mode
bogdanm 13:0645d8841f51 50 int I2C::write(int address, const char* data, int length, bool repeated) {
bogdanm 13:0645d8841f51 51 aquire();
bogdanm 13:0645d8841f51 52
bogdanm 13:0645d8841f51 53 int stop = (repeated) ? 0 : 1;
bogdanm 13:0645d8841f51 54 int written = i2c_write(&_i2c, address, data, length, stop);
bogdanm 13:0645d8841f51 55
bogdanm 13:0645d8841f51 56 return length != written;
bogdanm 13:0645d8841f51 57 }
bogdanm 13:0645d8841f51 58
bogdanm 13:0645d8841f51 59 int I2C::write(int data) {
bogdanm 13:0645d8841f51 60 return i2c_byte_write(&_i2c, data);
bogdanm 13:0645d8841f51 61 }
bogdanm 13:0645d8841f51 62
bogdanm 13:0645d8841f51 63 // read - Master Reciever Mode
bogdanm 13:0645d8841f51 64 int I2C::read(int address, char* data, int length, bool repeated) {
bogdanm 13:0645d8841f51 65 aquire();
bogdanm 13:0645d8841f51 66
bogdanm 13:0645d8841f51 67 int stop = (repeated) ? 0 : 1;
bogdanm 13:0645d8841f51 68 int read = i2c_read(&_i2c, address, data, length, stop);
bogdanm 13:0645d8841f51 69
bogdanm 13:0645d8841f51 70 return length != read;
bogdanm 13:0645d8841f51 71 }
bogdanm 13:0645d8841f51 72
bogdanm 13:0645d8841f51 73 int I2C::read(int ack) {
bogdanm 13:0645d8841f51 74 if (ack) {
bogdanm 13:0645d8841f51 75 return i2c_byte_read(&_i2c, 0);
bogdanm 13:0645d8841f51 76 } else {
bogdanm 13:0645d8841f51 77 return i2c_byte_read(&_i2c, 1);
bogdanm 13:0645d8841f51 78 }
bogdanm 13:0645d8841f51 79 }
bogdanm 13:0645d8841f51 80
bogdanm 13:0645d8841f51 81 void I2C::start(void) {
bogdanm 13:0645d8841f51 82 i2c_start(&_i2c);
bogdanm 13:0645d8841f51 83 }
bogdanm 13:0645d8841f51 84
bogdanm 13:0645d8841f51 85 void I2C::stop(void) {
bogdanm 13:0645d8841f51 86 i2c_stop(&_i2c);
bogdanm 13:0645d8841f51 87 }
bogdanm 13:0645d8841f51 88
bogdanm 13:0645d8841f51 89 } // namespace mbed
bogdanm 13:0645d8841f51 90
bogdanm 13:0645d8841f51 91 #endif