89 lines
2.8 KiB
C++
89 lines
2.8 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 "pi16adcchannel.h"
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#include "extern-plugininfo.h"
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#include <QDebug>
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#include <unistd.h>
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static QHash<int, char> channelMap = {
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{0, 0xB0},
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{1, 0xB8},
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{2, 0xB1},
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{3, 0xB9},
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{4, 0xB2},
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{5, 0xBA},
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{6, 0xB3},
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{7, 0xBB},
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{8, 0xB4},
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{9, 0xBC},
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{10, 0xB5},
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{11, 0xBD},
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{12, 0xB6},
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{13, 0xBE},
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{14, 0xB7},
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{15, 0xBF}
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};
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Pi16ADCChannel::Pi16ADCChannel(const QString &portName, int address, int channel, QObject *parent):
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I2CDevice(portName, address, parent),
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m_channel(channel)
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{
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}
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QByteArray Pi16ADCChannel::readData(int fd)
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{
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// The chip requires a minimum of 200ms of wating between each call or it might just ignore it.
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// Make sure to wait here long enough for any previous access having settled
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QThread::msleep(200);
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// Select the wanted channel
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qint64 len = write(fd, &channelMap[m_channel], 1);
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if (len != 1) {
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qCWarning(dcI2cDevices()) << "Pi-16ADC: Error writing channel config to device";
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return QByteArray();
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}
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// Wait for write the chip to settle
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QThread::msleep(200);
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// ready to read the value
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char readBuf[3] = {0};
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if (read(fd, readBuf, 3) != 3) {
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qCWarning(dcI2cDevices()) << "Pi-16ADC: could not read ADC data" << readBuf;
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return QByteArray();
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}
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return QByteArray(readBuf, 3);
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}
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