mbed library sources
Dependents: STM32F103C8T6-RangoTec STM32-103C8_Plantilla_USB
common/I2C.cpp
- Committer:
- mbed_official
- Date:
- 2014-05-26
- Revision:
- 212:34d62c0b2af6
- Parent:
- 13:0645d8841f51
File content as of revision 212:34d62c0b2af6:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "I2C.h" #if DEVICE_I2C namespace mbed { I2C *I2C::_owner = NULL; I2C::I2C(PinName sda, PinName scl) : _i2c(), _hz(100000) { // The init function also set the frequency to 100000 i2c_init(&_i2c, sda, scl); // Used to avoid unnecessary frequency updates _owner = this; } void I2C::frequency(int hz) { _hz = hz; // We want to update the frequency even if we are already the bus owners i2c_frequency(&_i2c, _hz); // Updating the frequency of the bus we become the owners of it _owner = this; } void I2C::aquire() { if (_owner != this) { i2c_frequency(&_i2c, _hz); _owner = this; } } // write - Master Transmitter Mode int I2C::write(int address, const char* data, int length, bool repeated) { aquire(); int stop = (repeated) ? 0 : 1; int written = i2c_write(&_i2c, address, data, length, stop); return length != written; } int I2C::write(int data) { return i2c_byte_write(&_i2c, data); } // read - Master Reciever Mode int I2C::read(int address, char* data, int length, bool repeated) { aquire(); int stop = (repeated) ? 0 : 1; int read = i2c_read(&_i2c, address, data, length, stop); return length != read; } int I2C::read(int ack) { if (ack) { return i2c_byte_read(&_i2c, 0); } else { return i2c_byte_read(&_i2c, 1); } } void I2C::start(void) { i2c_start(&_i2c); } void I2C::stop(void) { i2c_stop(&_i2c); } } // namespace mbed #endif