mbed library sources
Dependents: STM32F103C8T6-RangoTec STM32-103C8_Plantilla_USB
cpp/I2C.cpp
- Committer:
- mbed_official
- Date:
- 2012-11-20
- Revision:
- 0:fd0d7bdfcdc2
- Child:
- 2:143cac498751
File content as of revision 0:fd0d7bdfcdc2:
/* mbed Microcontroller Library * Copyright (c) 2006-2012 ARM Limited * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include "I2C.h" #if DEVICE_I2C namespace mbed { I2C *I2C::_owner = NULL; I2C::I2C(PinName sda, PinName scl) { // The init function also set the frequency to 100000 i2c_init(&_i2c, sda, scl); _hz = 100000; // 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 retval = i2c_write(&_i2c, address, data, length, stop); return retval; } 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 retval = i2c_read(&_i2c, address, data, length, stop); return retval; } 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