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/*
Q Light Controller Plus
gpioreaderthread.cpp
Copyright (c) Massimo Callegari
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0.txt
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include <QDebug>
#include <gpiod.hpp>
#include "gpioreaderthread.h"
#include "gpioplugin.h"
#define HYSTERESIS_THRESHOLD 3
ReadThread::ReadThread(GPIOPlugin *plugin, QObject *parent)
: QThread(parent)
, m_plugin(plugin)
, m_running(false)
, m_paused(false)
{
start();
}
ReadThread::~ReadThread()
{
stop();
}
void ReadThread::stop()
{
qDebug() << Q_FUNC_INFO;
if (isRunning() == true)
{
m_running = false;
wait();
}
}
void ReadThread::pause(bool paused)
{
qDebug() << Q_FUNC_INFO << paused;
QMutexLocker locker(&m_mutex);
m_paused = paused;
}
void ReadThread::run()
{
qDebug() << "[GPIO] Reader thread created";
m_running = true;
::gpiod::chip gChip(m_plugin->chipName());
while (m_running == true)
{
if (m_paused == true)
{
usleep(50000);
continue;
}
QMutexLocker locker(&m_mutex);
foreach (GPIOLineInfo *gpio, m_plugin->gpioList())
{
if (gpio->m_direction != GPIOPlugin::InputDirection)
continue;
::gpiod::line gLine = gChip.get_line(gpio->m_line);
gLine.request({"get_value", gpiod::line_request::DIRECTION_INPUT, 0}, 0);
int newVal = gLine.get_value();
gLine.release();
if (newVal != gpio->m_value)
{
gpio->m_count++;
if (gpio->m_count > HYSTERESIS_THRESHOLD)
{
qDebug() << "Value read: GPIO:" << gpio->m_line << "val:" << newVal;
gpio->m_value = newVal ? UCHAR_MAX : 0;
gpio->m_count = 0;
emit valueChanged(gpio->m_line, gpio->m_value);
}
}
else
{
gpio->m_count = 0;
}
}
locker.unlock();
usleep(50000);
}
}
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