checker_host/base/beep.cpp

#include "beep.h"
#include "QTimer"
#include "QThread"
beep::beep(QObject *parent) : QObject(parent)
{
  /* 开发板的 LED 控制接口 */
  file.setFileName("/sys/devices/platform/leds/leds/beep/brightness");
  if (!file.exists())
  {
    qWarning()<<"beep init Fail!!"<<endl;
    return ;
  }
  
  set_state(false);
  state = get_state();
  
  // 在启动此对象时自动鸣叫两次
  delay_on_ms = 100;
  delay_off_ms =100;
  ticks = 2;
  is_run = true;
}



bool beep::get_state()
{
    if(!file.exists())
        return  false;
    if(!file.open(QIODevice::ReadWrite))
        qWarning()<<file.errorString();
    QTextStream in(&file);

    QString buf = in.readLine();

    file.close();
    if(buf == "1")
    {
        state = true;
    }
    else
    {
        state = false;
    }
    return false;
}


// 控制蜂鸣器，用户程序一般不直接调用
bool beep::set_state(bool state)
{
    if (!file.exists())
        return false;
    if(!file.open(QIODevice::ReadWrite))
        qWarning()<<file.errorString();
    if(state)
    {
        file.write("1");
        this->state = true;
    }
    else
    {
        file.write("0");
        this->state = false;
    }
    file.close();

    return true;
}


void beep::start()
{
    QTimer::singleShot(0,this, &beep::run_cb);
}


bool beep::stop()
{
    QMutexLocker locker(&lock);
    is_run = false;
    return true;
}


// 用户程序调用这个函数开启蜂鸣器
void beep::set_beep(int delay_on_ms,int delay_off_ms,int ticks)
{

    this->delay_on_ms = delay_on_ms;
    this->delay_off_ms =delay_off_ms;
    this->ticks = ticks;
}


// 执行线程
void beep::run_cb()
{
    while(is_run)
    {
        QMutexLocker locker(&lock);
        while(ticks>0)
        {
            ticks--;
            set_state(true);
            QThread::msleep(delay_on_ms);
            set_state(false);
            QThread::msleep(delay_off_ms);
        }

    }
}



beep *Beep(){
  static beep *b=nullptr;
  static QThread thread;
  if(b==nullptr){
    b=new beep();
    b->moveToThread(&thread);
    thread.start();
    b->start();
  }
  return b;
}