SmartPDCode/Qt/QT_T113_S3_8inch_800X1280/smartPdu/gpiobutten.cpp

#include "gpiobutten.h"
#include "QFile"



GpioButten::GpioButten(QObject *parent) : QObject(parent)
{
    QFile exportFile("/sys/class/gpio/export");
    if (exportFile.open(QIODevice::WriteOnly)) {
        exportFile.write(QByteArray::number(PG(8)));
        exportFile.close();
    }
    QFile  dirFile(QString("/sys/class/gpio/gpio%1/direction").arg(PG(8)));
    dirFile.open(QIODevice::WriteOnly);
    dirFile.write("in");
    dirFile.close();
    m_lastvalue = 0;
    connect(&m_timer, &QTimer::timeout, this, &GpioButten::onPoll);
    m_timer.start(20);
}


void GpioButten::onPoll()
{
    QString valPath = QString("/sys/class/gpio/gpio%1/value").arg(PG(8));
    QFile valFile(valPath);
    if (!valFile.open(QIODevice::ReadOnly)) return;
    QTextStream in(&valFile);
    int currentValue = in.readLine().toInt();
    valFile.close();

    if(currentValue != m_lastvalue)
    {
        if (!m_debounceTimer.isValid()) {
                        m_debounceTimer.start();
        } else if (m_debounceTimer.elapsed() > 50) {
                        // 假设低电平有效（按下为0），高电平释放
            if (currentValue == 0) {
                emit pressed();
            } else {
                            //emit released();
            }
            m_lastvalue = currentValue;
            m_debounceTimer.invalidate();
        }
       } else {
          m_debounceTimer.invalidate();
       }


}


GpioButten:: ~GpioButten()
{
    QFile unexportFile("/sys/class/gpio/unexport");
    if (unexportFile.open(QIODevice::WriteOnly)) {
        unexportFile.write(QByteArray::number(PG(8)));
        unexportFile.close();
    }
}