113 lines
2.7 KiB
C++
113 lines
2.7 KiB
C++
// SPDX-License-Identifier: LGPL-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.
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*
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* nymea is free software: you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation, either version 3
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* of the License, or (at your option) any later version.
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*
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* nymea 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
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* GNU 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 nymea. If not, see <https://www.gnu.org/licenses/>.
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#ifndef PWM_H
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#define PWM_H
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#include <QObject>
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#include <QDebug>
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#include <QFile>
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#include <QDir>
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#include "libnymea.h"
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/* i.MX6 PWMs
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*
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* /sys/class/pwm/pwmchip0 -> pwm1 (npwm = 1)
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* /sys/class/pwm/pwmchip1 -> pwm2 (npwm = 1)
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* /sys/class/pwm/pwmchip2 -> pwm3 (npwm = 1)
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* /sys/class/pwm/pwmchip3 -> pwm4 (npwm = 1)
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*
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* each chip has 1 pwm ( -> pwm0)
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*
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* example:
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* echo 0 > /sys/class/pwm/pwmchip1/export
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*
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* ls -l /sys/class/pwm/pwmchip1/pwm0/
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* duty_cycle => nano seconds active time
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* enable => 0 = disable, 1 = enable
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* period => nano seconds active + inactive
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* polarity => "normal" or "inversed"
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*
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* |<--------- period --------->|
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*
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* |<--duty cycle -->|
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* 1_ _________________ _________________ _____
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* | | | | |
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* 0_ _| |___________| |___________| .......
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*
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*/
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class LIBNYMEA_EXPORT Pwm : public QObject
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{
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Q_OBJECT
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public:
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enum Polarity {
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PolarityNormal,
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PolarityInversed,
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PolarityInvalid
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};
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explicit Pwm(int chipNumber, QObject *parent = nullptr);
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~Pwm();
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static bool isAvailable();
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bool exportPwm();
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bool enable();
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bool disable();
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bool isEnabled();
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int chipNumber();
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long period();
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bool setPeriod(long nanoSeconds);
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double frequency();
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bool setFrequency(double kHz);
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long dutyCycle();
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bool setDutyCycle(long nanoSeconds);
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Pwm::Polarity polarity();
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bool setPolarity(Pwm::Polarity polarity);
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int percentage();
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bool setPercentage(int percentage);
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private:
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int m_chipNumber;
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long m_period;
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long m_dutyCycle;
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QDir m_pwmDirectory;
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bool unexportPwm();
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};
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QDebug operator<< (QDebug d, Pwm *pwm);
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#endif // PWM_H
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