[BRLTTY] Inka's non-standard flow control

[Samuel Thibault]

Nicolas Pitre, le Sun 23 Apr 2006 13:41:42 -0400, a écrit :
> On Sun, 23 Apr 2006, Samuel Thibault wrote:
> 
> > Hi,
> > 
> > Samuel Thibault, le Sat 22 Apr 2006 00:01:30 +0200, a écrit :
> > > Getting back to a quite old discussion:
> > > 
> > > Dave Mielke, le Tue 26 Jul 2005 06:45:23 -0400, a écrit :
> > > > [quoted lines by Samuel Thibault on 2005/07/26 at 10:15 +0200]
> > > > >Do you have information about the non-standard flow control that
> > > > >Inka uses ? 
> > > > 
> > > > Yes. The display must strobe CTS after each character sent by the PC, and the
> > > > PC must strobe RTS after each character sent by the display.
> > > 
> > > How long does the strobe need to at least be?
> > 
> > If you don't have a precise answer right now, do you at least have a
> > order of magnitude? (microseconds? milliseconds?)
> > 
> > I need this information for deciding how to implement this in Linux.
> 
> Do it in user space.  Please.

Why? Doesn't it need the strobe to be quite responsive?

We tried to implement the VisioBraille non-standard flow control, and it
wasn't working because it wasn't responsive enough. If strobing _each
character_ from user space is responsive enough, then fine. But I really
doubt it will ever work at 57600bps...

Regards,
Samuel