Minicom unable to disconnect modem/drop DTR on a ttyUSB device

[Adam Lackorzynski]

Hi,

On Tue Apr 26, 2016 at 11:35:34 +0200, Marcin Szewczyk wrote:
> Hi,
> 
> On Tue, Apr 26, 2016 at 12:12:57AM +0200, Adam Lackorzynski wrote:
> > On Fri Apr 22, 2016 at 12:37:20 +0200, Marcin Szewczyk wrote:
> > > The way of dropping/rising DTR using specialized functions[4] seems
> > > more straightforward than resetting baud rate for a moment,
> > > especially if there is a suspicion that minicom in the only software
> > > relying on this method[1]. I do not know if it is still true that
> > > usb-serial driver is the only one maintained[5] so one can think it
> > > is like a reference implementation.
> > 
> > I'd just use TIOCMBIS/TIOCMBIC, TIOCSDTR even does not exist on my
> > system (anymore).
> 
> Just for clarity -- that is what I meant by writing about a specialized
> function. The mentioned patch[4] uses TIOCMBIS/TIOCMBIC.
> 
> > > Maybe the patch could be included upstream? Is minicom still maintained?
> > > There are a few old bugs hanging on bugs.debian.org.
> 
> > > As a side note I would like to point to some inconsistency in code
> > > concerning DTR switching inside the m_dtrtoggle() function in sysdep1.c.
> 
> > I'll look over call sites and probably will make it more consistent with
> > its usage. sec==0 probably has the intention that it means "just off"
> > and the comment is misleading.
> 
> Do you intend to to add the TIOCMBIS/TIOCMBIC calls when looking at
> this?

It's in the repo already.



Adam