mirror of https://github.com/ARMmbed/mbed-os.git
92 lines
2.1 KiB
C++
92 lines
2.1 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "I2C.h"
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#if DEVICE_I2C
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namespace mbed {
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I2C *I2C::_owner = NULL;
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I2C::I2C(PinName sda, PinName scl) : _i2c(), _hz(100000) {
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// The init function also set the frequency to 100000
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i2c_init(&_i2c, sda, scl);
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// Used to avoid unnecessary frequency updates
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_owner = this;
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}
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void I2C::frequency(int hz) {
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_hz = hz;
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// We want to update the frequency even if we are already the bus owners
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i2c_frequency(&_i2c, _hz);
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// Updating the frequency of the bus we become the owners of it
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_owner = this;
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}
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void I2C::aquire() {
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if (_owner != this) {
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i2c_frequency(&_i2c, _hz);
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_owner = this;
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}
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}
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// write - Master Transmitter Mode
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int I2C::write(int address, const char* data, int length, bool repeated) {
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aquire();
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int stop = (repeated) ? 0 : 1;
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int written = i2c_write(&_i2c, address, data, length, stop);
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return length != written;
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}
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int I2C::write(int data) {
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return i2c_byte_write(&_i2c, data);
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}
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// read - Master Reciever Mode
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int I2C::read(int address, char* data, int length, bool repeated) {
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aquire();
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int stop = (repeated) ? 0 : 1;
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int read = i2c_read(&_i2c, address, data, length, stop);
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return length != read;
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}
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int I2C::read(int ack) {
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if (ack) {
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return i2c_byte_read(&_i2c, 0);
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} else {
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return i2c_byte_read(&_i2c, 1);
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}
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}
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void I2C::start(void) {
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i2c_start(&_i2c);
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}
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void I2C::stop(void) {
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i2c_stop(&_i2c);
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}
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} // namespace mbed
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#endif
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