92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
// SPDX-License-Identifier: GPL-3.0-or-later
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*
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* Copyright (C) 2013 - 2024, nymea GmbH
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* Copyright (C) 2024 - 2025, chargebyte austria GmbH
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*
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* This file is part of nymea-plugins.
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*
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* nymea-plugins is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* nymea-plugins is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with nymea-plugins. If not, see <https://www.gnu.org/licenses/>.
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include "ads1115channel.h"
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#include "extern-plugininfo.h"
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#include <unistd.h>
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#define REGISTER_CONVERSATION 0x00
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#define REGISTER_CONFIG 0x01
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#define OPERATIONAL_STATE_IDLE 0x00
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#define OPERATIONAL_STATE_CONVERSATION 0x80
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#define CONVERSION_MODE_CONTINUOUS 0x00
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#define CONVERSION_MODE_SINGLE 0x40
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#define CHANNEL_MODE_DIFFERENTIAL 0x00
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#define CHANNEL_MODE_SINGLE 0x01
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ADS1115Channel::ADS1115Channel(const QString &portName, int address, int channel, Gain gain, QObject *parent):
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I2CDevice(portName, address, parent),
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m_channel(channel),
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m_gain(gain)
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{
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}
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QByteArray ADS1115Channel::readData(int fd)
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{
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// Start a configuration conversation
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unsigned char writeBuf[3] = {0};
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writeBuf[0] = REGISTER_CONFIG; // Select config register
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writeBuf[1] |= OPERATIONAL_STATE_CONVERSATION; // Set conversation bit
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writeBuf[1] |= CHANNEL_MODE_SINGLE;
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writeBuf[1] |= m_channel << 4;
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writeBuf[1] |= m_gain << 1;
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writeBuf[1] |= CONVERSION_MODE_SINGLE;
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writeBuf[2] = 0x85; // 0b10000101: Data rate: 100, not using comparator
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if (write(fd, writeBuf, 3) != 3) {
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qCWarning(dcI2cDevices()) << "ADS1115: could not write config register";
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return QByteArray();
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}
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// Wait for device to accept configuration (conversation bit is cleared)
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char readBuf[2] = {0};
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do {
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if (read(fd, readBuf, 2) != 2) {
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qCWarning(dcI2cDevices()) << "ADS1115: could not read ADC data";
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return QByteArray();
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}
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} while (!(readBuf[0] & OPERATIONAL_STATE_CONVERSATION));
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// Select conversation register
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writeBuf[0] = REGISTER_CONVERSATION;
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if (write(fd, writeBuf, 1) != 1) {
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qCWarning(dcI2cDevices()) << "ADS1115: could not write select register";
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return QByteArray();
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}
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// Read conversation register
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if (read(fd, readBuf, 2) != 2) {
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qCWarning(dcI2cDevices()) << "ADS1115: could not read ADC data";
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return QByteArray();
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}
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return QByteArray(readBuf, 2);
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}
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