Re: [Boost-users] get/set RTS on serial port - Linux

Subject: Re: [Boost-users] get/set RTS on serial port - Linux
From: Marce (mlorenzati_at_[hidden])
Date: 2010-11-04 23:11:44

Finally I implemented a workaround for this in the class that uses the
serial port, it uses set_option for windows and for linux I recover the
native descriptor of the serial port and use it to call ioctl as commonly
done in linux.

bool WorkerSerial::controlRTS(bool level)
{
    #ifdef WIN32

    boost::system::error_code ec;
    m_SerialPort.set_option(RTSControl(x), ec);
    if (ec.error_code != success) return false;

    #elif __linux__

    int status;
    if (ioctl(m_SerialPort.native(), TIOCMGET, &status) == -1) return false;
    if (level) status |=  TIOCM_RTS;
    else       status &= ~TIOCM_RTS;
    if (ioctl(m_SerialPort.native(), TIOCMSET, &status) == -1)   return
false;

    #endif

    return true;
}

Is not nice but functional for the time...

2010/11/3 Marce <mlorenzati_at_[hidden]>

> Hi,
> In a later post of myself I asked about getting / setting the RTS line by
> software control (http://lists.boost.org/boost-users/2010/06/59700.php)
> I managed to get working as explained in Windows as replied in by Michael
> Caisse (http://lists.boost.org/boost-users/2010/06/59723.php) but in linux
> I'm not being able to get it working.
> I can control it in linux by calling ioctl ( ioctl(fd, TIOCMSET, &status) )
> but in the set-option I do not have the file descriptor but the termios that
> I don't completely understand.
> Does someone provide me and example to make this 'option'
>
> This is my RTSControl option class:
>
> class RTSControl
> {
> public:
>     explicit RTSControl(bool enable = false) : m_enable(enable) {};
>     boost::system::error_code store(BOOST_ASIO_OPTION_STORAGE& storage, boost::system::error_code& ec) const
>     {
>         #if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
>         if (m_enable) storage.fRtsControl = RTS_CONTROL_ENABLE;
>         else storage.fRtsControl = RTS_CONTROL_DISABLE;
>         #else
>         #endif
>         return ec;
>     };
>
>     boost::system::error_code load(const BOOST_ASIO_OPTION_STORAGE& storage, boost::system::error_code& ec)
>     {
>         #if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
>         if (storage.fRtsControl == RTS_CONTROL_ENABLE) m_enable = true;
>         else m_enable = true;
>         #else
>         #endif
>         return ec;
>     };
> private:
>     bool m_enable;
> };
>
> BOOST_ASIO_OPTION_STORAGE is termios for Linux systems.
>
>