118 lines
3.7 KiB
C++
118 lines
3.7 KiB
C++
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*
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* Copyright 2013 - 2020, nymea GmbH
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* Contact: contact@nymea.io
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*
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* This file is part of nymea.
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* This project including source code and documentation is protected by
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* copyright law, and remains the property of nymea GmbH. All rights, including
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* reproduction, publication, editing and translation, are reserved. The use of
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* this project is subject to the terms of a license agreement to be concluded
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* with nymea GmbH in accordance with the terms of use of nymea GmbH, available
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* under https://nymea.io/license
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*
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* GNU Lesser General Public License Usage
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* Alternatively, this project may be redistributed and/or modified under the
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* terms of the GNU Lesser General Public License as published by the Free
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* Software Foundation; version 3. This project is distributed in the hope that
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* it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this project. If not, see <https://www.gnu.org/licenses/>.
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*
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* For any further details and any questions please contact us under
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* contact@nymea.io or see our FAQ/Licensing Information on
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* https://nymea.io/license/faq
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include "mcp23008.h"
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#include "i2cport.h"
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#include "extern-plugininfo.h"
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extern "C" {
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/syscall.h>
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#include <linux/i2c-dev.h>
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#include <i2c/smbus.h>
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}
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MCP23008::MCP23008(const QString &i2cPortName, int i2cAddress, QObject *parent) :
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QObject(parent),
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m_i2cPortName(i2cPortName),
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m_i2cAddress(i2cAddress)
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{
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}
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MCP23008::~MCP23008()
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{
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m_i2cFile.close();
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}
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bool MCP23008::init()
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{
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qCDebug(dcUniPi()) << "MCP23008: initialize I2C port" << m_i2cPortName << QString("0x%1").arg(m_i2cAddress, 0, 16);
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m_i2cFile.setFileName("/dev/" + m_i2cPortName);
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if (!m_i2cFile.exists()) {
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qCWarning(dcUniPi()) << "MCP23008: The given I2C file descriptor does not exist:" << m_i2cFile.fileName();
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return false;
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}
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if (!m_i2cFile.open(QFile::ReadWrite)) {
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qCWarning(dcUniPi()) << "MCP23008: Could not open the given I2C file descriptor:" << m_i2cFile.fileName() << m_i2cFile.errorString();
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return false;
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}
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m_fileDescriptor = m_i2cFile.handle();
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return true;
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}
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bool MCP23008::writeRegister(MCP23008::RegisterAddress registerAddress, uint8_t value)
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{
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#ifdef __arm__
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if (ioctl(m_fileDescriptor, I2C_SLAVE, m_i2cAddress) < 0) {
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qCWarning(dcUniPi()) << "MCP23008: Could not set I2C into slave mode" << m_i2cPortName << QString("0x%1").arg(m_i2cAddress, 0, 16);
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return false;
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}
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// Write command
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int length = i2c_smbus_write_byte_data(m_fileDescriptor, registerAddress, value);
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if (length < 0) {
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qCWarning(dcUniPi()) << "MCP23008: Could not sent command to I2C bus.";
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return false;
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}
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return true;
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#else
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Q_UNUSED(value)
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Q_UNUSED(registerAddress)
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return false;
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#endif // __arm__
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}
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bool MCP23008::readRegister(RegisterAddress registerAddress, uint8_t *value)
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{
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#ifdef __arm__
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if (ioctl(m_fileDescriptor, I2C_SLAVE, m_i2cAddress) < 0) {
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qCWarning(dcUniPi()) << "MCP23008: Could not set I2C into slave mode" << m_i2cPortName << QString("0x%1").arg(m_i2cAddress, 0, 16);
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return false;
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}
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*value = i2c_smbus_read_byte_data(m_fileDescriptor, registerAddress);
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return true;
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#else
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Q_UNUSED(registerAddress)
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Q_UNUSED(value)
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return false;
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#endif // __arm__
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}
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