mbed library sources
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Diff: cpp/I2C.cpp
- Revision:
- 9:0ce32e54c9a7
- Parent:
- 8:4e25b8576136
- Child:
- 10:3bc89ef62ce7
--- a/cpp/I2C.cpp Thu May 30 16:59:31 2013 +0100 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,92 +0,0 @@ -/* 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) { - // 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